<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:019e2206-f16f-7bc4-90fd-177c6bf79b48,g:57a797f8-9d97-4cf8-882d-9b41da50ecd6-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:roleRef roleURI="http://www.mainstcapital.com/role/Cover" xlink:type="simple" xlink:href="main-20260630.xsd#Cover"/>
  <link:presentationLink xlink:role="http://www.mainstcapital.com/role/Cover" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_dei_CoverAbstract_019e2207-0a8b-7fce-b487-37958583ac0e" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_CoverAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentType_019e2207-0a8b-77ed-81af-166a0039d7a9" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentType"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e2207-0a8b-7fce-b487-37958583ac0e" xlink:to="loc_dei_DocumentType_019e2207-0a8b-77ed-81af-166a0039d7a9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentQuarterlyReport_019e2207-0a8b-7632-b6f2-33506a714319" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentQuarterlyReport"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e2207-0a8b-7fce-b487-37958583ac0e" xlink:to="loc_dei_DocumentQuarterlyReport_019e2207-0a8b-7632-b6f2-33506a714319" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentPeriodEndDate_019e2207-0a8b-7256-8a47-f19875b534e6" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentPeriodEndDate"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e2207-0a8b-7fce-b487-37958583ac0e" xlink:to="loc_dei_DocumentPeriodEndDate_019e2207-0a8b-7256-8a47-f19875b534e6" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentTransitionReport_019e2207-0a8b-700b-af87-d29a3a103613" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentTransitionReport"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e2207-0a8b-7fce-b487-37958583ac0e" xlink:to="loc_dei_DocumentTransitionReport_019e2207-0a8b-700b-af87-d29a3a103613" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFileNumber_019e2207-0a8b-7676-b28c-d67bee5dc135" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityFileNumber"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e2207-0a8b-7fce-b487-37958583ac0e" xlink:to="loc_dei_EntityFileNumber_019e2207-0a8b-7676-b28c-d67bee5dc135" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityRegistrantName_019e2207-0a8b-7165-80b0-fab79f778be8" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityRegistrantName"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e2207-0a8b-7fce-b487-37958583ac0e" xlink:to="loc_dei_EntityRegistrantName_019e2207-0a8b-7165-80b0-fab79f778be8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityIncorporationStateCountryCode_019e2207-0a8b-7ea1-ab4f-928d737073d8" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityIncorporationStateCountryCode"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e2207-0a8b-7fce-b487-37958583ac0e" xlink:to="loc_dei_EntityIncorporationStateCountryCode_019e2207-0a8b-7ea1-ab4f-928d737073d8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityTaxIdentificationNumber_019e2207-0a8b-7292-a9b7-afb0cd099ec4" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityTaxIdentificationNumber"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e2207-0a8b-7fce-b487-37958583ac0e" xlink:to="loc_dei_EntityTaxIdentificationNumber_019e2207-0a8b-7292-a9b7-afb0cd099ec4" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine1_019e2207-0a8b-7e3b-8846-87f166a6384a" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressAddressLine1"/>
    <link:presentationArc order="9" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e2207-0a8b-7fce-b487-37958583ac0e" xlink:to="loc_dei_EntityAddressAddressLine1_019e2207-0a8b-7e3b-8846-87f166a6384a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine2_019e2207-0a8b-7a71-b592-1feec441b8be" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressAddressLine2"/>
    <link:presentationArc order="10" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e2207-0a8b-7fce-b487-37958583ac0e" xlink:to="loc_dei_EntityAddressAddressLine2_019e2207-0a8b-7a71-b592-1feec441b8be" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCityOrTown_019e2207-0a8b-7dc7-a0b1-01aab70ca35d" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressCityOrTown"/>
    <link:presentationArc order="11" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e2207-0a8b-7fce-b487-37958583ac0e" xlink:to="loc_dei_EntityAddressCityOrTown_019e2207-0a8b-7dc7-a0b1-01aab70ca35d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressStateOrProvince_019e2207-0a8b-77f3-a95a-0654624d7d8e" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressStateOrProvince"/>
    <link:presentationArc order="12" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e2207-0a8b-7fce-b487-37958583ac0e" xlink:to="loc_dei_EntityAddressStateOrProvince_019e2207-0a8b-77f3-a95a-0654624d7d8e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressPostalZipCode_019e2207-0a8b-761a-ac7b-bae579ab262e" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressPostalZipCode"/>
    <link:presentationArc order="13" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e2207-0a8b-7fce-b487-37958583ac0e" xlink:to="loc_dei_EntityAddressPostalZipCode_019e2207-0a8b-761a-ac7b-bae579ab262e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CityAreaCode_019e2207-0a8b-7820-9394-7b9c477b1f63" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_CityAreaCode"/>
    <link:presentationArc order="14" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e2207-0a8b-7fce-b487-37958583ac0e" xlink:to="loc_dei_CityAreaCode_019e2207-0a8b-7820-9394-7b9c477b1f63" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LocalPhoneNumber_019e2207-0a8b-70ba-948c-90cdad5045c2" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LocalPhoneNumber"/>
    <link:presentationArc order="15" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e2207-0a8b-7fce-b487-37958583ac0e" xlink:to="loc_dei_LocalPhoneNumber_019e2207-0a8b-70ba-948c-90cdad5045c2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_Security12bTitle_019e2207-0a8b-7c28-970c-a8996893b3d0" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_Security12bTitle"/>
    <link:presentationArc order="16" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e2207-0a8b-7fce-b487-37958583ac0e" xlink:to="loc_dei_Security12bTitle_019e2207-0a8b-7c28-970c-a8996893b3d0" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_TradingSymbol_019e2207-0a8b-76bc-bc38-da3405a1dfd9" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_TradingSymbol"/>
    <link:presentationArc order="17" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e2207-0a8b-7fce-b487-37958583ac0e" xlink:to="loc_dei_TradingSymbol_019e2207-0a8b-76bc-bc38-da3405a1dfd9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SecurityExchangeName_019e2207-0a8b-71c8-a010-1678674d3c6c" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_SecurityExchangeName"/>
    <link:presentationArc order="18" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e2207-0a8b-7fce-b487-37958583ac0e" xlink:to="loc_dei_SecurityExchangeName_019e2207-0a8b-71c8-a010-1678674d3c6c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCurrentReportingStatus_019e2207-0a8b-72cf-abea-d070ae0b4a45" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityCurrentReportingStatus"/>
    <link:presentationArc order="19" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e2207-0a8b-7fce-b487-37958583ac0e" xlink:to="loc_dei_EntityCurrentReportingStatus_019e2207-0a8b-72cf-abea-d070ae0b4a45" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityInteractiveDataCurrent_019e2207-0a8b-7468-a93f-4f245464e839" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityInteractiveDataCurrent"/>
    <link:presentationArc order="20" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e2207-0a8b-7fce-b487-37958583ac0e" xlink:to="loc_dei_EntityInteractiveDataCurrent_019e2207-0a8b-7468-a93f-4f245464e839" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFilerCategory_019e2207-0a8b-74fa-866b-9a5b794f2b9a" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityFilerCategory"/>
    <link:presentationArc order="21" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e2207-0a8b-7fce-b487-37958583ac0e" xlink:to="loc_dei_EntityFilerCategory_019e2207-0a8b-74fa-866b-9a5b794f2b9a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntitySmallBusiness_019e2207-0a8b-7dd6-bbc1-47ab23b53f8b" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntitySmallBusiness"/>
    <link:presentationArc order="22" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e2207-0a8b-7fce-b487-37958583ac0e" xlink:to="loc_dei_EntitySmallBusiness_019e2207-0a8b-7dd6-bbc1-47ab23b53f8b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityEmergingGrowthCompany_019e2207-0a8b-73a5-987c-b94ed7f63899" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityEmergingGrowthCompany"/>
    <link:presentationArc order="23" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e2207-0a8b-7fce-b487-37958583ac0e" xlink:to="loc_dei_EntityEmergingGrowthCompany_019e2207-0a8b-73a5-987c-b94ed7f63899" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityShellCompany_019e2207-0a8b-7cb7-adb5-46f1dce8c339" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityShellCompany"/>
    <link:presentationArc order="24" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e2207-0a8b-7fce-b487-37958583ac0e" xlink:to="loc_dei_EntityShellCompany_019e2207-0a8b-7cb7-adb5-46f1dce8c339" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCommonStockSharesOutstanding_019e2207-0a8b-7a7d-82cc-86f253ccf44b" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityCommonStockSharesOutstanding"/>
    <link:presentationArc order="25" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e2207-0a8b-7fce-b487-37958583ac0e" xlink:to="loc_dei_EntityCommonStockSharesOutstanding_019e2207-0a8b-7a7d-82cc-86f253ccf44b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCentralIndexKey_019e2207-0a8b-7494-adaa-d7b42f44364b" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityCentralIndexKey"/>
    <link:presentationArc order="26" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e2207-0a8b-7fce-b487-37958583ac0e" xlink:to="loc_dei_EntityCentralIndexKey_019e2207-0a8b-7494-adaa-d7b42f44364b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CurrentFiscalYearEndDate_019e2207-0a8b-73d6-9f20-8e77072b4d70" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_CurrentFiscalYearEndDate"/>
    <link:presentationArc order="27" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e2207-0a8b-7fce-b487-37958583ac0e" xlink:to="loc_dei_CurrentFiscalYearEndDate_019e2207-0a8b-73d6-9f20-8e77072b4d70" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentFiscalYearFocus_019e2207-0a8b-7e81-b678-8474cc02845a" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentFiscalYearFocus"/>
    <link:presentationArc order="28" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e2207-0a8b-7fce-b487-37958583ac0e" xlink:to="loc_dei_DocumentFiscalYearFocus_019e2207-0a8b-7e81-b678-8474cc02845a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentFiscalPeriodFocus_019e2207-0a8b-772b-be4f-3271ecba2969" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentFiscalPeriodFocus"/>
    <link:presentationArc order="29" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e2207-0a8b-7fce-b487-37958583ac0e" xlink:to="loc_dei_DocumentFiscalPeriodFocus_019e2207-0a8b-772b-be4f-3271ecba2969" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AmendmentFlag_019e2207-0a8b-7070-90a4-6283784fafb7" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_AmendmentFlag"/>
    <link:presentationArc order="30" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e2207-0a8b-7fce-b487-37958583ac0e" xlink:to="loc_dei_AmendmentFlag_019e2207-0a8b-7070-90a4-6283784fafb7" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.mainstcapital.com/role/ConsolidatedBalanceSheets" xlink:type="simple" xlink:href="main-20260630.xsd#ConsolidatedBalanceSheets"/>
  <link:presentationLink xlink:role="http://www.mainstcapital.com/role/ConsolidatedBalanceSheets" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementOfFinancialPositionAbstract_019e2207-0a8b-7364-8d67-4767e436a20e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementOfFinancialPositionAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_019e2207-0a8b-77c0-8fd0-8f4889032b4e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementOfFinancialPositionAbstract_019e2207-0a8b-7364-8d67-4767e436a20e" xlink:to="loc_us-gaap_StatementTable_019e2207-0a8b-77c0-8fd0-8f4889032b4e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentIssuerAffiliationAxis_019e2207-0a8b-7e18-9793-a97e69083d4a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentIssuerAffiliationAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementTable_019e2207-0a8b-77c0-8fd0-8f4889032b4e" xlink:to="loc_us-gaap_InvestmentIssuerAffiliationAxis_019e2207-0a8b-7e18-9793-a97e69083d4a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentIssuerAffiliationDomain_019e2207-0a8b-7abf-b1a9-927cf788f751" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentIssuerAffiliationDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerAffiliationAxis_019e2207-0a8b-7e18-9793-a97e69083d4a" xlink:to="loc_us-gaap_InvestmentIssuerAffiliationDomain_019e2207-0a8b-7abf-b1a9-927cf788f751" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentAffiliatedIssuerControlledMember_019e2207-0a8b-754d-bede-de96d91c080a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentAffiliatedIssuerControlledMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerAffiliationDomain_019e2207-0a8b-7abf-b1a9-927cf788f751" xlink:to="loc_us-gaap_InvestmentAffiliatedIssuerControlledMember_019e2207-0a8b-754d-bede-de96d91c080a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentAffiliatedIssuerNoncontrolledMember_019e2207-0a8b-77c4-b536-971aaf191ab3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentAffiliatedIssuerNoncontrolledMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerAffiliationDomain_019e2207-0a8b-7abf-b1a9-927cf788f751" xlink:to="loc_us-gaap_InvestmentAffiliatedIssuerNoncontrolledMember_019e2207-0a8b-77c4-b536-971aaf191ab3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentUnaffiliatedIssuerMember_019e2207-0a8b-76e9-a3a0-aff0d693afe8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentUnaffiliatedIssuerMember"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerAffiliationDomain_019e2207-0a8b-7abf-b1a9-927cf788f751" xlink:to="loc_us-gaap_InvestmentUnaffiliatedIssuerMember_019e2207-0a8b-76e9-a3a0-aff0d693afe8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_019e2207-0a8b-7b0a-930c-142734ad8fae" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementTable_019e2207-0a8b-77c0-8fd0-8f4889032b4e" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_019e2207-0a8b-7b0a-930c-142734ad8fae" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019e2207-0a8b-75c7-a805-bc6238ab314d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019e2207-0a8b-7b0a-930c-142734ad8fae" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019e2207-0a8b-75c7-a805-bc6238ab314d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_019e2207-0a8b-75b4-92b5-2fb53d179bdd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019e2207-0a8b-75c7-a805-bc6238ab314d" xlink:to="loc_us-gaap_LineOfCreditMember_019e2207-0a8b-75b4-92b5-2fb53d179bdd" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnsecuredDebtMember_019e2207-0a8b-7889-a715-7bd8e0ee4b27" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_UnsecuredDebtMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019e2207-0a8b-75c7-a805-bc6238ab314d" xlink:to="loc_us-gaap_UnsecuredDebtMember_019e2207-0a8b-7889-a715-7bd8e0ee4b27" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_019e2207-0a8b-72b5-8d05-7ad24bbf5bfc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditFacilityAxis"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementTable_019e2207-0a8b-77c0-8fd0-8f4889032b4e" xlink:to="loc_us-gaap_CreditFacilityAxis_019e2207-0a8b-72b5-8d05-7ad24bbf5bfc" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019e2207-0a8b-7542-b079-6a20310e495b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditFacilityDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CreditFacilityAxis_019e2207-0a8b-72b5-8d05-7ad24bbf5bfc" xlink:to="loc_us-gaap_CreditFacilityDomain_019e2207-0a8b-7542-b079-6a20310e495b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_019e2207-0a8b-7965-8ec0-1477a939538c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CreditFacilityDomain_019e2207-0a8b-7542-b079-6a20310e495b" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_019e2207-0a8b-7965-8ec0-1477a939538c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_019e2207-0a8b-7d15-bcab-b8ac122cb494" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementTable_019e2207-0a8b-77c0-8fd0-8f4889032b4e" xlink:to="loc_us-gaap_DebtInstrumentAxis_019e2207-0a8b-7d15-bcab-b8ac122cb494" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019e2207-0a8b-7fc5-9b05-cd8fbb8c128c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentAxis_019e2207-0a8b-7d15-bcab-b8ac122cb494" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019e2207-0a8b-7fc5-9b05-cd8fbb8c128c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_March2029NotesMember_019e2207-0a8b-74ca-8367-1ae440198002" xlink:href="main-20260630.xsd#main_March2029NotesMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e2207-0a8b-7fc5-9b05-cd8fbb8c128c" xlink:to="loc_main_March2029NotesMember_019e2207-0a8b-74ca-8367-1ae440198002" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_July2026NotesMember_019e2207-0a8b-78a3-b910-7b36d6cc0412" xlink:href="main-20260630.xsd#main_July2026NotesMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e2207-0a8b-7fc5-9b05-cd8fbb8c128c" xlink:to="loc_main_July2026NotesMember_019e2207-0a8b-78a3-b910-7b36d6cc0412" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_June2027NotesMember_019e2207-0a8b-79b2-8e7d-11759241b01e" xlink:href="main-20260630.xsd#main_June2027NotesMember"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e2207-0a8b-7fc5-9b05-cd8fbb8c128c" xlink:to="loc_main_June2027NotesMember_019e2207-0a8b-79b2-8e7d-11759241b01e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_August2028NotesMember_019e2207-0a8b-7bca-932f-39974131378e" xlink:href="main-20260630.xsd#main_August2028NotesMember"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e2207-0a8b-7fc5-9b05-cd8fbb8c128c" xlink:to="loc_main_August2028NotesMember_019e2207-0a8b-7bca-932f-39974131378e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_SBICDebenturesMember_019e2207-0a8b-746a-8c08-60b5f26ed19f" xlink:href="main-20260630.xsd#main_SBICDebenturesMember"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e2207-0a8b-7fc5-9b05-cd8fbb8c128c" xlink:to="loc_main_SBICDebenturesMember_019e2207-0a8b-746a-8c08-60b5f26ed19f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_April2031NotesMember_019e6871-2be1-739d-a93e-83bea3da704c" xlink:href="main-20260630.xsd#main_April2031NotesMember"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e2207-0a8b-7fc5-9b05-cd8fbb8c128c" xlink:to="loc_main_April2031NotesMember_019e6871-2be1-739d-a93e-83bea3da704c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_019e2207-0a8b-7c7d-9e7a-80e7e3f88a71" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementLineItems"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementTable_019e2207-0a8b-77c0-8fd0-8f4889032b4e" xlink:to="loc_us-gaap_StatementLineItems_019e2207-0a8b-7c7d-9e7a-80e7e3f88a71" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsAbstract_019e2207-0a8b-73ae-8d3f-a9705fa1ed54" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetsAbstract"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_019e2207-0a8b-7c7d-9e7a-80e7e3f88a71" xlink:to="loc_us-gaap_AssetsAbstract_019e2207-0a8b-73ae-8d3f-a9705fa1ed54" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentOwnedAtFairValue_019e2207-0a8b-7e6a-b7a7-574dec1ccb29" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentOwnedAtFairValue"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsAbstract_019e2207-0a8b-73ae-8d3f-a9705fa1ed54" xlink:to="loc_us-gaap_InvestmentOwnedAtFairValue_019e2207-0a8b-7e6a-b7a7-574dec1ccb29" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_019e2207-0a8b-799b-b750-c0ad9a9fd4cd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsAbstract_019e2207-0a8b-73ae-8d3f-a9705fa1ed54" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_019e2207-0a8b-799b-b750-c0ad9a9fd4cd" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendAndInterestReceivable_019e2207-0a8b-7c05-bb4d-b5d3b1255a84" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DividendAndInterestReceivable"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsAbstract_019e2207-0a8b-73ae-8d3f-a9705fa1ed54" xlink:to="loc_us-gaap_DividendAndInterestReceivable_019e2207-0a8b-7c05-bb4d-b5d3b1255a84" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrepaidExpenseAndOtherAssets_019fcc55-5eea-7ebf-96ea-2005a09e1692" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PrepaidExpenseAndOtherAssets"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsAbstract_019e2207-0a8b-73ae-8d3f-a9705fa1ed54" xlink:to="loc_us-gaap_PrepaidExpenseAndOtherAssets_019fcc55-5eea-7ebf-96ea-2005a09e1692" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFinanceCostsNet_019e2207-0a8b-726b-b3de-72b3932de13c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DeferredFinanceCostsNet"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsAbstract_019e2207-0a8b-73ae-8d3f-a9705fa1ed54" xlink:to="loc_us-gaap_DeferredFinanceCostsNet_019e2207-0a8b-726b-b3de-72b3932de13c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_019e2207-0a8b-7488-9079-1b38a34ff98c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Assets"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsAbstract_019e2207-0a8b-73ae-8d3f-a9705fa1ed54" xlink:to="loc_us-gaap_Assets_019e2207-0a8b-7488-9079-1b38a34ff98c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019e2207-0a8b-714b-88a4-15da413a633d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_019e2207-0a8b-7c7d-9e7a-80e7e3f88a71" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019e2207-0a8b-714b-88a4-15da413a633d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAbstract_019e2207-0a8b-706c-9886-7e169c4046b9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilitiesAbstract"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019e2207-0a8b-714b-88a4-15da413a633d" xlink:to="loc_us-gaap_LiabilitiesAbstract_019e2207-0a8b-706c-9886-7e169c4046b9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_019e2207-0a8b-78ae-87a9-cba5b9b0614f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermDebt"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAbstract_019e2207-0a8b-706c-9886-7e169c4046b9" xlink:to="loc_us-gaap_LongTermDebt_019e2207-0a8b-78ae-87a9-cba5b9b0614f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableAndOtherAccruedLiabilities_019e2207-0a8b-7af2-8258-621bbeae3876" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccountsPayableAndOtherAccruedLiabilities"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAbstract_019e2207-0a8b-706c-9886-7e169c4046b9" xlink:to="loc_us-gaap_AccountsPayableAndOtherAccruedLiabilities_019e2207-0a8b-7af2-8258-621bbeae3876" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestPayableCurrentAndNoncurrent_019e2207-0a8b-7ccf-860d-6dd2da11a49a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestPayableCurrentAndNoncurrent"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAbstract_019e2207-0a8b-706c-9886-7e169c4046b9" xlink:to="loc_us-gaap_InterestPayableCurrentAndNoncurrent_019e2207-0a8b-7ccf-860d-6dd2da11a49a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsPayableCurrentAndNoncurrent_019e2207-0a8b-75c6-8dcb-5debc77fb062" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DividendsPayableCurrentAndNoncurrent"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAbstract_019e2207-0a8b-706c-9886-7e169c4046b9" xlink:to="loc_us-gaap_DividendsPayableCurrentAndNoncurrent_019e2207-0a8b-75c6-8dcb-5debc77fb062" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxLiabilitiesNet_019e2207-0a8b-7f10-8b89-a4e65668e90d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DeferredIncomeTaxLiabilitiesNet"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAbstract_019e2207-0a8b-706c-9886-7e169c4046b9" xlink:to="loc_us-gaap_DeferredIncomeTaxLiabilitiesNet_019e2207-0a8b-7f10-8b89-a4e65668e90d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_019e2207-0a8b-75f9-a38d-232d17ee9302" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Liabilities"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAbstract_019e2207-0a8b-706c-9886-7e169c4046b9" xlink:to="loc_us-gaap_Liabilities_019e2207-0a8b-75f9-a38d-232d17ee9302" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommitmentsAndContingencies_019e2207-0a8b-73d6-bac6-20e7d46850bb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommitmentsAndContingencies"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019e2207-0a8b-714b-88a4-15da413a633d" xlink:to="loc_us-gaap_CommitmentsAndContingencies_019e2207-0a8b-73d6-bac6-20e7d46850bb" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityAbstract_019e2207-0a8b-764a-aae8-46fd4af3e670" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquityAbstract"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019e2207-0a8b-714b-88a4-15da413a633d" xlink:to="loc_us-gaap_StockholdersEquityAbstract_019e2207-0a8b-764a-aae8-46fd4af3e670" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockValue_019e2207-0a8b-7a0f-9155-eaaa242ceaa6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockValue"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StockholdersEquityAbstract_019e2207-0a8b-764a-aae8-46fd4af3e670" xlink:to="loc_us-gaap_CommonStockValue_019e2207-0a8b-7a0f-9155-eaaa242ceaa6" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapital_019e2207-0a8b-7cd2-bc81-fb30a8c5067c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdditionalPaidInCapital"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StockholdersEquityAbstract_019e2207-0a8b-764a-aae8-46fd4af3e670" xlink:to="loc_us-gaap_AdditionalPaidInCapital_019e2207-0a8b-7cd2-bc81-fb30a8c5067c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_019e2207-0a8b-7379-9b06-16d0a6bcda91" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetainedEarningsAccumulatedDeficit"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StockholdersEquityAbstract_019e2207-0a8b-764a-aae8-46fd4af3e670" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_019e2207-0a8b-7379-9b06-16d0a6bcda91" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_019e2207-0a8b-7062-9004-c505718943a5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquity"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StockholdersEquityAbstract_019e2207-0a8b-764a-aae8-46fd4af3e670" xlink:to="loc_us-gaap_StockholdersEquity_019e2207-0a8b-7062-9004-c505718943a5" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_019e2207-0a8b-746a-87a2-9821c6577968" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilitiesAndStockholdersEquity"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019e2207-0a8b-714b-88a4-15da413a633d" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquity_019e2207-0a8b-746a-87a2-9821c6577968" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetAssetValuePerShare_019e2207-0a8b-7c39-9bcf-e568a2fa42f1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetAssetValuePerShare"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019e2207-0a8b-714b-88a4-15da413a633d" xlink:to="loc_us-gaap_NetAssetValuePerShare_019e2207-0a8b-7c39-9bcf-e568a2fa42f1" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.mainstcapital.com/role/ConsolidatedBalanceSheetsParenthetical" xlink:type="simple" xlink:href="main-20260630.xsd#ConsolidatedBalanceSheetsParenthetical"/>
  <link:presentationLink xlink:role="http://www.mainstcapital.com/role/ConsolidatedBalanceSheetsParenthetical" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementOfFinancialPositionAbstract_019e2207-0a8b-7667-91b5-e5e08e2ccee8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementOfFinancialPositionAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_019e2207-0a8b-7b90-a375-041f9f799113" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementOfFinancialPositionAbstract_019e2207-0a8b-7667-91b5-e5e08e2ccee8" xlink:to="loc_us-gaap_StatementTable_019e2207-0a8b-7b90-a375-041f9f799113" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentIssuerAffiliationAxis_019e2207-0a8b-761d-bcad-2f477ef10e47" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentIssuerAffiliationAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementTable_019e2207-0a8b-7b90-a375-041f9f799113" xlink:to="loc_us-gaap_InvestmentIssuerAffiliationAxis_019e2207-0a8b-761d-bcad-2f477ef10e47" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentIssuerAffiliationDomain_019e2207-0a8b-7f1c-95bb-664616a1a7cd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentIssuerAffiliationDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerAffiliationAxis_019e2207-0a8b-761d-bcad-2f477ef10e47" xlink:to="loc_us-gaap_InvestmentIssuerAffiliationDomain_019e2207-0a8b-7f1c-95bb-664616a1a7cd" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentAffiliatedIssuerControlledMember_019e2207-0a8b-778d-88fb-4a857d436cab" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentAffiliatedIssuerControlledMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerAffiliationDomain_019e2207-0a8b-7f1c-95bb-664616a1a7cd" xlink:to="loc_us-gaap_InvestmentAffiliatedIssuerControlledMember_019e2207-0a8b-778d-88fb-4a857d436cab" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentAffiliatedIssuerNoncontrolledMember_019e2207-0a8b-7814-98aa-8434dd754485" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentAffiliatedIssuerNoncontrolledMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerAffiliationDomain_019e2207-0a8b-7f1c-95bb-664616a1a7cd" xlink:to="loc_us-gaap_InvestmentAffiliatedIssuerNoncontrolledMember_019e2207-0a8b-7814-98aa-8434dd754485" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentUnaffiliatedIssuerMember_019e2207-0a8b-7a88-afdd-3d27bd415018" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentUnaffiliatedIssuerMember"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerAffiliationDomain_019e2207-0a8b-7f1c-95bb-664616a1a7cd" xlink:to="loc_us-gaap_InvestmentUnaffiliatedIssuerMember_019e2207-0a8b-7a88-afdd-3d27bd415018" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_019e2207-0a8b-73e2-981a-76e0f0cf3c00" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementTable_019e2207-0a8b-7b90-a375-041f9f799113" xlink:to="loc_us-gaap_DebtInstrumentAxis_019e2207-0a8b-73e2-981a-76e0f0cf3c00" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019e2207-0a8b-7f38-b1c6-e1f9cd72b481" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentAxis_019e2207-0a8b-73e2-981a-76e0f0cf3c00" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019e2207-0a8b-7f38-b1c6-e1f9cd72b481" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_March2029NotesMember_019e2207-0a8b-7654-92a4-1c30b6ea56cc" xlink:href="main-20260630.xsd#main_March2029NotesMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e2207-0a8b-7f38-b1c6-e1f9cd72b481" xlink:to="loc_main_March2029NotesMember_019e2207-0a8b-7654-92a4-1c30b6ea56cc" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_July2026NotesMember_019e2207-0a8b-7f25-aa53-c056db4d6689" xlink:href="main-20260630.xsd#main_July2026NotesMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e2207-0a8b-7f38-b1c6-e1f9cd72b481" xlink:to="loc_main_July2026NotesMember_019e2207-0a8b-7f25-aa53-c056db4d6689" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_June2027NotesMember_019e2207-0a8b-7c10-9543-3b33245b7939" xlink:href="main-20260630.xsd#main_June2027NotesMember"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e2207-0a8b-7f38-b1c6-e1f9cd72b481" xlink:to="loc_main_June2027NotesMember_019e2207-0a8b-7c10-9543-3b33245b7939" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_August2028NotesMember_019e2207-0a8b-7455-8f34-c6f4fb1c6576" xlink:href="main-20260630.xsd#main_August2028NotesMember"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e2207-0a8b-7f38-b1c6-e1f9cd72b481" xlink:to="loc_main_August2028NotesMember_019e2207-0a8b-7455-8f34-c6f4fb1c6576" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_SBICDebenturesMember_019e2207-0a8b-7a43-b7ee-6ad2f98bb5ab" xlink:href="main-20260630.xsd#main_SBICDebenturesMember"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e2207-0a8b-7f38-b1c6-e1f9cd72b481" xlink:to="loc_main_SBICDebenturesMember_019e2207-0a8b-7a43-b7ee-6ad2f98bb5ab" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_April2031NotesMember_019e6874-e678-7e9e-a2c2-89da71398275" xlink:href="main-20260630.xsd#main_April2031NotesMember"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e2207-0a8b-7f38-b1c6-e1f9cd72b481" xlink:to="loc_main_April2031NotesMember_019e6874-e678-7e9e-a2c2-89da71398275" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_019e2207-0a8b-76bf-957f-f7413cfcbabb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementTable_019e2207-0a8b-7b90-a375-041f9f799113" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_019e2207-0a8b-76bf-957f-f7413cfcbabb" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019e2207-0a8b-7c82-90bc-3f6b8c20e2d4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019e2207-0a8b-76bf-957f-f7413cfcbabb" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019e2207-0a8b-7c82-90bc-3f6b8c20e2d4" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnsecuredDebtMember_019e2207-0a8b-7ee1-b5fb-eb82e570286d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_UnsecuredDebtMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019e2207-0a8b-7c82-90bc-3f6b8c20e2d4" xlink:to="loc_us-gaap_UnsecuredDebtMember_019e2207-0a8b-7ee1-b5fb-eb82e570286d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_019e2207-0a8b-7534-9b39-ec314a2b5840" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementLineItems"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementTable_019e2207-0a8b-7b90-a375-041f9f799113" xlink:to="loc_us-gaap_StatementLineItems_019e2207-0a8b-7534-9b39-ec314a2b5840" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentOwnedAtCost_019e2207-0a8b-721d-846a-72c798b79423" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentOwnedAtCost"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_019e2207-0a8b-7534-9b39-ec314a2b5840" xlink:to="loc_us-gaap_InvestmentOwnedAtCost_019e2207-0a8b-721d-846a-72c798b79423" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedAmortizationDeferredFinanceCosts_019e2207-0a8b-7c43-a781-4396f11bdd5b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedAmortizationDeferredFinanceCosts"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_019e2207-0a8b-7534-9b39-ec314a2b5840" xlink:to="loc_us-gaap_AccumulatedAmortizationDeferredFinanceCosts_019e2207-0a8b-7c43-a781-4396f11bdd5b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet_019eb648-7faa-726b-aea8-e6ec194efc55" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_019e2207-0a8b-7534-9b39-ec314a2b5840" xlink:to="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet_019eb648-7faa-726b-aea8-e6ec194efc55" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockParOrStatedValuePerShare_019e2207-0a8b-7d6c-900c-008aa3694d38" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockParOrStatedValuePerShare"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_019e2207-0a8b-7534-9b39-ec314a2b5840" xlink:to="loc_us-gaap_CommonStockParOrStatedValuePerShare_019e2207-0a8b-7d6c-900c-008aa3694d38" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesAuthorized_019e2207-0a8b-74a9-b420-d636467e5912" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockSharesAuthorized"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_019e2207-0a8b-7534-9b39-ec314a2b5840" xlink:to="loc_us-gaap_CommonStockSharesAuthorized_019e2207-0a8b-74a9-b420-d636467e5912" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesIssued_019e2207-0a8b-7909-b1ef-1edcbb926843" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockSharesIssued"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_019e2207-0a8b-7534-9b39-ec314a2b5840" xlink:to="loc_us-gaap_CommonStockSharesIssued_019e2207-0a8b-7909-b1ef-1edcbb926843" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_019e2207-0a8b-74a0-a5fd-782d0822ee40" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_019e2207-0a8b-7534-9b39-ec314a2b5840" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_019e2207-0a8b-74a0-a5fd-782d0822ee40" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.mainstcapital.com/role/ConsolidatedStatementsofOperations" xlink:type="simple" xlink:href="main-20260630.xsd#ConsolidatedStatementsofOperations"/>
  <link:presentationLink xlink:role="http://www.mainstcapital.com/role/ConsolidatedStatementsofOperations" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementAbstract_019e2207-0a8b-7dd8-a7c6-1694e5ae74d1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeStatementAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_019e2207-0a8b-76d1-a449-988e868cd0b0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementAbstract_019e2207-0a8b-7dd8-a7c6-1694e5ae74d1" xlink:to="loc_us-gaap_StatementTable_019e2207-0a8b-76d1-a449-988e868cd0b0" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentIssuerAffiliationAxis_019e2207-0a8b-7938-8604-e1a932845989" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentIssuerAffiliationAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementTable_019e2207-0a8b-76d1-a449-988e868cd0b0" xlink:to="loc_us-gaap_InvestmentIssuerAffiliationAxis_019e2207-0a8b-7938-8604-e1a932845989" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentIssuerAffiliationDomain_019e2207-0a8b-7cb1-80e8-6f02704c562f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentIssuerAffiliationDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerAffiliationAxis_019e2207-0a8b-7938-8604-e1a932845989" xlink:to="loc_us-gaap_InvestmentIssuerAffiliationDomain_019e2207-0a8b-7cb1-80e8-6f02704c562f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentAffiliatedIssuerControlledMember_019e2207-0a8b-7612-a088-642e5404f6ef" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentAffiliatedIssuerControlledMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerAffiliationDomain_019e2207-0a8b-7cb1-80e8-6f02704c562f" xlink:to="loc_us-gaap_InvestmentAffiliatedIssuerControlledMember_019e2207-0a8b-7612-a088-642e5404f6ef" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentAffiliatedIssuerNoncontrolledMember_019e2207-0a8b-74c9-b055-8e4c875aee23" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentAffiliatedIssuerNoncontrolledMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerAffiliationDomain_019e2207-0a8b-7cb1-80e8-6f02704c562f" xlink:to="loc_us-gaap_InvestmentAffiliatedIssuerNoncontrolledMember_019e2207-0a8b-74c9-b055-8e4c875aee23" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentUnaffiliatedIssuerMember_019e2207-0a8b-76b6-8da5-0c63f5e4e94f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentUnaffiliatedIssuerMember"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerAffiliationDomain_019e2207-0a8b-7cb1-80e8-6f02704c562f" xlink:to="loc_us-gaap_InvestmentUnaffiliatedIssuerMember_019e2207-0a8b-76b6-8da5-0c63f5e4e94f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_019e2207-0a8b-7588-9770-fda02fa9f019" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementLineItems"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementTable_019e2207-0a8b-76d1-a449-988e868cd0b0" xlink:to="loc_us-gaap_StatementLineItems_019e2207-0a8b-7588-9770-fda02fa9f019" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentIncomeNetAbstract_019e2207-0a8b-7842-8b08-5825a76cda5a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentIncomeNetAbstract"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_019e2207-0a8b-7588-9770-fda02fa9f019" xlink:to="loc_us-gaap_InvestmentIncomeNetAbstract_019e2207-0a8b-7842-8b08-5825a76cda5a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentIncomeInterest_019eb686-1ed2-7c15-97cc-76858a706a53" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentIncomeInterest"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIncomeNetAbstract_019e2207-0a8b-7842-8b08-5825a76cda5a" xlink:to="loc_us-gaap_InvestmentIncomeInterest_019eb686-1ed2-7c15-97cc-76858a706a53" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentIncomeDividend_019eb687-61eb-7a75-b679-282199390dd0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentIncomeDividend"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIncomeNetAbstract_019e2207-0a8b-7842-8b08-5825a76cda5a" xlink:to="loc_us-gaap_InvestmentIncomeDividend_019eb687-61eb-7a75-b679-282199390dd0" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FeeIncome_019eb687-e0f7-7717-ad10-0545bd82a3c4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FeeIncome"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIncomeNetAbstract_019e2207-0a8b-7842-8b08-5825a76cda5a" xlink:to="loc_us-gaap_FeeIncome_019eb687-e0f7-7717-ad10-0545bd82a3c4" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GrossInvestmentIncomeOperating_019e2207-0a8b-7be6-9067-e0b515b60c54" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GrossInvestmentIncomeOperating"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIncomeNetAbstract_019e2207-0a8b-7842-8b08-5825a76cda5a" xlink:to="loc_us-gaap_GrossInvestmentIncomeOperating_019e2207-0a8b-7be6-9067-e0b515b60c54" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestAndDebtExpenseAbstract_019e2207-0a8b-7ba3-8657-6e43b0c09cb8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestAndDebtExpenseAbstract"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_019e2207-0a8b-7588-9770-fda02fa9f019" xlink:to="loc_us-gaap_InterestAndDebtExpenseAbstract_019e2207-0a8b-7ba3-8657-6e43b0c09cb8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseOperating_019e2207-0a8b-7f4b-bc08-45ab2a1f6089" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestExpenseOperating"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InterestAndDebtExpenseAbstract_019e2207-0a8b-7ba3-8657-6e43b0c09cb8" xlink:to="loc_us-gaap_InterestExpenseOperating_019e2207-0a8b-7f4b-bc08-45ab2a1f6089" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SalariesWagesAndOfficersCompensation_019e2207-0a8b-7676-912a-9b2b05657f30" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SalariesWagesAndOfficersCompensation"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InterestAndDebtExpenseAbstract_019e2207-0a8b-7ba3-8657-6e43b0c09cb8" xlink:to="loc_us-gaap_SalariesWagesAndOfficersCompensation_019e2207-0a8b-7676-912a-9b2b05657f30" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeneralAndAdministrativeExpense_019e2207-0a8b-799c-aa80-f352693598ec" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GeneralAndAdministrativeExpense"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InterestAndDebtExpenseAbstract_019e2207-0a8b-7ba3-8657-6e43b0c09cb8" xlink:to="loc_us-gaap_GeneralAndAdministrativeExpense_019e2207-0a8b-799c-aa80-f352693598ec" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_019e2207-0a8b-7468-b550-e35417de3943" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AllocatedShareBasedCompensationExpense"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InterestAndDebtExpenseAbstract_019e2207-0a8b-7ba3-8657-6e43b0c09cb8" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_019e2207-0a8b-7468-b550-e35417de3943" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentCompanyExpenseOffsetArrangement_019e2207-0a8b-7673-8ea6-39a547d0341c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentCompanyExpenseOffsetArrangement"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InterestAndDebtExpenseAbstract_019e2207-0a8b-7ba3-8657-6e43b0c09cb8" xlink:to="loc_us-gaap_InvestmentCompanyExpenseOffsetArrangement_019e2207-0a8b-7673-8ea6-39a547d0341c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentIncomeInvestmentExpense_019e2207-0a8b-7e06-9597-2f0be658ab3f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentIncomeInvestmentExpense"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InterestAndDebtExpenseAbstract_019e2207-0a8b-7ba3-8657-6e43b0c09cb8" xlink:to="loc_us-gaap_InvestmentIncomeInvestmentExpense_019e2207-0a8b-7e06-9597-2f0be658ab3f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedTotalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetInvestmentIncome_019e2207-0a8b-747b-ae78-d07fa2464e31" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetInvestmentIncome"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_019e2207-0a8b-7588-9770-fda02fa9f019" xlink:to="loc_us-gaap_NetInvestmentIncome_019e2207-0a8b-747b-ae78-d07fa2464e31" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentCompanyExciseTaxExpense_019e2207-0a8b-7947-87e9-83da43a330e0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentCompanyExciseTaxExpense"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_019e2207-0a8b-7588-9770-fda02fa9f019" xlink:to="loc_us-gaap_InvestmentCompanyExciseTaxExpense_019e2207-0a8b-7947-87e9-83da43a330e0" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_InvestmentCompanyFederalAndStateIncomeAndOtherTaxExpense_019e2207-0a8b-7916-90c4-bfd467439711" xlink:href="main-20260630.xsd#main_InvestmentCompanyFederalAndStateIncomeAndOtherTaxExpense"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_019e2207-0a8b-7588-9770-fda02fa9f019" xlink:to="loc_main_InvestmentCompanyFederalAndStateIncomeAndOtherTaxExpense_019e2207-0a8b-7916-90c4-bfd467439711" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentIncomeOperatingAfterExpenseAndTax_019e2207-0a8b-7fda-9d98-2b1a1e95b6f6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentIncomeOperatingAfterExpenseAndTax"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_019e2207-0a8b-7588-9770-fda02fa9f019" xlink:to="loc_us-gaap_InvestmentIncomeOperatingAfterExpenseAndTax_019e2207-0a8b-7fda-9d98-2b1a1e95b6f6" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_NetRealizedGainsLossesAbstract_019e2207-0a8b-714b-814f-70950b7d71c9" xlink:href="main-20260630.xsd#main_NetRealizedGainsLossesAbstract"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_019e2207-0a8b-7588-9770-fda02fa9f019" xlink:to="loc_main_NetRealizedGainsLossesAbstract_019e2207-0a8b-714b-814f-70950b7d71c9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtAndEquitySecuritiesRealizedGainLoss_019e2207-0a8b-7f79-b0ac-4d058e7d3f6e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtAndEquitySecuritiesRealizedGainLoss"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_main_NetRealizedGainsLossesAbstract_019e2207-0a8b-714b-814f-70950b7d71c9" xlink:to="loc_us-gaap_DebtAndEquitySecuritiesRealizedGainLoss_019e2207-0a8b-7f79-b0ac-4d058e7d3f6e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_InvestmentOwnedRecognizedUnrealizedAppreciationDepreciationNetAbstract_019e2207-0a8b-7d84-a41a-1277a18109f2" xlink:href="main-20260630.xsd#main_InvestmentOwnedRecognizedUnrealizedAppreciationDepreciationNetAbstract"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_019e2207-0a8b-7588-9770-fda02fa9f019" xlink:to="loc_main_InvestmentOwnedRecognizedUnrealizedAppreciationDepreciationNetAbstract_019e2207-0a8b-7d84-a41a-1277a18109f2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtAndEquitySecuritiesUnrealizedGainLoss_019e2207-0a8b-7936-aae1-2de6ba6d3163" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtAndEquitySecuritiesUnrealizedGainLoss"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_main_InvestmentOwnedRecognizedUnrealizedAppreciationDepreciationNetAbstract_019e2207-0a8b-7d84-a41a-1277a18109f2" xlink:to="loc_us-gaap_DebtAndEquitySecuritiesUnrealizedGainLoss_019e2207-0a8b-7936-aae1-2de6ba6d3163" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealizedGainLossInvestmentAndDerivativeOperatingTaxExpenseBenefit_019e2207-0a8b-7ad5-ae9f-6a49a20a2df2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RealizedGainLossInvestmentAndDerivativeOperatingTaxExpenseBenefit"/>
    <link:presentationArc order="9" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_019e2207-0a8b-7588-9770-fda02fa9f019" xlink:to="loc_us-gaap_RealizedGainLossInvestmentAndDerivativeOperatingTaxExpenseBenefit_019e2207-0a8b-7ad5-ae9f-6a49a20a2df2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_019e2207-0a8b-7417-9a05-c19e895f7409" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLoss"/>
    <link:presentationArc order="10" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_019e2207-0a8b-7588-9770-fda02fa9f019" xlink:to="loc_us-gaap_NetIncomeLoss_019e2207-0a8b-7417-9a05-c19e895f7409" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_InvestmentCompanyInvestmentIncomeLossFromOperationsPerSharePerBasicShare_019e2207-0a8b-769d-bb11-dbb26ad6ad70" xlink:href="main-20260630.xsd#main_InvestmentCompanyInvestmentIncomeLossFromOperationsPerSharePerBasicShare"/>
    <link:presentationArc order="11" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_019e2207-0a8b-7588-9770-fda02fa9f019" xlink:to="loc_main_InvestmentCompanyInvestmentIncomeLossFromOperationsPerSharePerBasicShare_019e2207-0a8b-769d-bb11-dbb26ad6ad70" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_InvestmentCompanyInvestmentIncomeLossFromOperationsPerSharePerDilutedShare_019e2207-0a8b-7401-88b6-1651c45bef57" xlink:href="main-20260630.xsd#main_InvestmentCompanyInvestmentIncomeLossFromOperationsPerSharePerDilutedShare"/>
    <link:presentationArc order="12" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_019e2207-0a8b-7588-9770-fda02fa9f019" xlink:to="loc_main_InvestmentCompanyInvestmentIncomeLossFromOperationsPerSharePerDilutedShare_019e2207-0a8b-7401-88b6-1651c45bef57" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_019e2207-0a8b-78ed-83ea-a311894e8319" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic"/>
    <link:presentationArc order="13" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_019e2207-0a8b-7588-9770-fda02fa9f019" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_019e2207-0a8b-78ed-83ea-a311894e8319" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_019e2207-0a8b-781f-a729-e2ee6ca629b8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding"/>
    <link:presentationArc order="14" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_019e2207-0a8b-7588-9770-fda02fa9f019" xlink:to="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_019e2207-0a8b-781f-a729-e2ee6ca629b8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.mainstcapital.com/role/ConsolidatedStatementsofChangesinNetAssets" xlink:type="simple" xlink:href="main-20260630.xsd#ConsolidatedStatementsofChangesinNetAssets"/>
  <link:presentationLink xlink:role="http://www.mainstcapital.com/role/ConsolidatedStatementsofChangesinNetAssets" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementOfStockholdersEquityAbstract_019e2207-0a8b-7877-a350-3b75e4b3f474" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementOfStockholdersEquityAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_019e2207-0a8b-7c58-9628-f40b81a7bee2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementOfStockholdersEquityAbstract_019e2207-0a8b-7877-a350-3b75e4b3f474" xlink:to="loc_us-gaap_StatementTable_019e2207-0a8b-7c58-9628-f40b81a7bee2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_019e2207-0a8b-749e-86d8-58de64de36f5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementTable_019e2207-0a8b-7c58-9628-f40b81a7bee2" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_019e2207-0a8b-749e-86d8-58de64de36f5" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019e2207-0a8b-7ca8-821a-ba326ddc542f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityComponentDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019e2207-0a8b-749e-86d8-58de64de36f5" xlink:to="loc_us-gaap_EquityComponentDomain_019e2207-0a8b-7ca8-821a-ba326ddc542f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_019e2207-0a8b-7fa7-a404-f2436085140b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityComponentDomain_019e2207-0a8b-7ca8-821a-ba326ddc542f" xlink:to="loc_us-gaap_CommonStockMember_019e2207-0a8b-7fa7-a404-f2436085140b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_019e2207-0a8b-71c2-8633-851c802b8e9e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdditionalPaidInCapitalMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityComponentDomain_019e2207-0a8b-7ca8-821a-ba326ddc542f" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_019e2207-0a8b-71c2-8633-851c802b8e9e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_019e2207-0a8b-7799-809e-b8aae062ff18" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetainedEarningsMember"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityComponentDomain_019e2207-0a8b-7ca8-821a-ba326ddc542f" xlink:to="loc_us-gaap_RetainedEarningsMember_019e2207-0a8b-7799-809e-b8aae062ff18" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_019e2207-0a8b-725a-9386-b2250582a2dd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementLineItems"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementTable_019e2207-0a8b-7c58-9628-f40b81a7bee2" xlink:to="loc_us-gaap_StatementLineItems_019e2207-0a8b-725a-9386-b2250582a2dd" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e2207-0a8b-72ad-bb1c-919a8aecdb52" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_019e2207-0a8b-725a-9386-b2250582a2dd" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e2207-0a8b-72ad-bb1c-919a8aecdb52" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_019e2207-0a8b-7033-b4da-753d7c313157" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e2207-0a8b-72ad-bb1c-919a8aecdb52" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_019e2207-0a8b-7033-b4da-753d7c313157" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/periodStartLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_019e2207-0a8b-7d79-8e5c-baf0e347416a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquity"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e2207-0a8b-72ad-bb1c-919a8aecdb52" xlink:to="loc_us-gaap_StockholdersEquity_019e2207-0a8b-7d79-8e5c-baf0e347416a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/periodStartLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_019e2207-0a8b-750f-9ba6-7dc3fbe854fc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodSharesNewIssues"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e2207-0a8b-72ad-bb1c-919a8aecdb52" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_019e2207-0a8b-750f-9ba6-7dc3fbe854fc" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueNewIssues_019e2207-0a8b-76e3-a50d-a3342fd528f6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodValueNewIssues"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e2207-0a8b-72ad-bb1c-919a8aecdb52" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueNewIssues_019e2207-0a8b-76e3-a50d-a3342fd528f6" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_019e2207-0a8b-7278-9a97-3f8403963712" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e2207-0a8b-72ad-bb1c-919a8aecdb52" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_019e2207-0a8b-7278-9a97-3f8403963712" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation_019e6884-4633-732e-9cb6-c3ca68747efb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e2207-0a8b-72ad-bb1c-919a8aecdb52" xlink:to="loc_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation_019e6884-4633-732e-9cb6-c3ca68747efb" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation_019e6881-2d42-7fbb-9d98-33c88f17620c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e2207-0a8b-72ad-bb1c-919a8aecdb52" xlink:to="loc_us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation_019e6881-2d42-7fbb-9d98-33c88f17620c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan_019e2207-0a8b-7e1e-a12d-614745d188a5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e2207-0a8b-72ad-bb1c-919a8aecdb52" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan_019e2207-0a8b-7e1e-a12d-614745d188a5" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueDividendReinvestmentPlan_019e2207-0a8b-7f17-bde7-cb673a5d63e6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodValueDividendReinvestmentPlan"/>
    <link:presentationArc order="9" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e2207-0a8b-72ad-bb1c-919a8aecdb52" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueDividendReinvestmentPlan_019e2207-0a8b-7f17-bde7-cb673a5d63e6" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_AdjustmentsToAdditionalPaidInCapitalAmortizationOfDirectorsDeferredCompensation_019e2207-0a8b-7636-a5d0-865a1bdb76a8" xlink:href="main-20260630.xsd#main_AdjustmentsToAdditionalPaidInCapitalAmortizationOfDirectorsDeferredCompensation"/>
    <link:presentationArc order="10" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e2207-0a8b-72ad-bb1c-919a8aecdb52" xlink:to="loc_main_AdjustmentsToAdditionalPaidInCapitalAmortizationOfDirectorsDeferredCompensation_019e2207-0a8b-7636-a5d0-865a1bdb76a8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures_019e2207-0a8b-77d7-8d1d-ff805033d896" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures"/>
    <link:presentationArc order="11" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e2207-0a8b-72ad-bb1c-919a8aecdb52" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures_019e2207-0a8b-77d7-8d1d-ff805033d896" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures_019e6884-d088-7ad0-aa78-2a2aaca7be74" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures"/>
    <link:presentationArc order="12" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e2207-0a8b-72ad-bb1c-919a8aecdb52" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures_019e6884-d088-7ad0-aa78-2a2aaca7be74" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_019e2207-0a8b-78b9-a414-0ecb6620ef44" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLoss"/>
    <link:presentationArc order="13" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e2207-0a8b-72ad-bb1c-919a8aecdb52" xlink:to="loc_us-gaap_NetIncomeLoss_019e2207-0a8b-78b9-a414-0ecb6620ef44" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsCommonStock_019e2207-0a8b-751d-b08e-28fa493c2622" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DividendsCommonStock"/>
    <link:presentationArc order="14" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e2207-0a8b-72ad-bb1c-919a8aecdb52" xlink:to="loc_us-gaap_DividendsCommonStock_019e2207-0a8b-751d-b08e-28fa493c2622" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_019e2207-0a8b-7e3d-8906-c080373aecce" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:presentationArc order="15" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e2207-0a8b-72ad-bb1c-919a8aecdb52" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_019e2207-0a8b-7e3d-8906-c080373aecce" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/periodEndLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_019e2207-0a8b-77af-b564-4c92d6cc0abc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquity"/>
    <link:presentationArc order="16" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e2207-0a8b-72ad-bb1c-919a8aecdb52" xlink:to="loc_us-gaap_StockholdersEquity_019e2207-0a8b-77af-b564-4c92d6cc0abc" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/periodEndLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.mainstcapital.com/role/ConsolidatedStatementsofCashFlows" xlink:type="simple" xlink:href="main-20260630.xsd#ConsolidatedStatementsofCashFlows"/>
  <link:presentationLink xlink:role="http://www.mainstcapital.com/role/ConsolidatedStatementsofCashFlows" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementOfCashFlowsAbstract_019e2207-0a8b-77c6-b1d4-44974a0dccee" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementOfCashFlowsAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_019e688d-1efc-7a05-b7c6-921565c3951c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementOfCashFlowsAbstract_019e2207-0a8b-77c6-b1d4-44974a0dccee" xlink:to="loc_us-gaap_StatementTable_019e688d-1efc-7a05-b7c6-921565c3951c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_019e688d-1efc-7beb-878a-fbaba20c3d98" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementTable_019e688d-1efc-7a05-b7c6-921565c3951c" xlink:to="loc_us-gaap_DebtInstrumentAxis_019e688d-1efc-7beb-878a-fbaba20c3d98" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019e688d-1efc-7bd2-9582-4e7d65c025fe" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentAxis_019e688d-1efc-7beb-878a-fbaba20c3d98" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019e688d-1efc-7bd2-9582-4e7d65c025fe" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_March2029NotesMember_019e688d-67df-7e42-a6ef-712d34d77b66" xlink:href="main-20260630.xsd#main_March2029NotesMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e688d-1efc-7bd2-9582-4e7d65c025fe" xlink:to="loc_main_March2029NotesMember_019e688d-67df-7e42-a6ef-712d34d77b66" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_April2031NotesMember_019e688d-9cdf-7136-8343-6c5c42a7b61c" xlink:href="main-20260630.xsd#main_April2031NotesMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e688d-1efc-7bd2-9582-4e7d65c025fe" xlink:to="loc_main_April2031NotesMember_019e688d-9cdf-7136-8343-6c5c42a7b61c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_019e688e-8d26-7082-b691-08b13b13a88d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementLineItems"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementTable_019e688d-1efc-7a05-b7c6-921565c3951c" xlink:to="loc_us-gaap_StatementLineItems_019e688e-8d26-7082-b691-08b13b13a88d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_019e2207-0a8b-7392-8a1a-2a9e29df896b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_019e688e-8d26-7082-b691-08b13b13a88d" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_019e2207-0a8b-7392-8a1a-2a9e29df896b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_019e2207-0a8b-7c25-80a3-7a1373dc0454" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLoss"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_019e2207-0a8b-7392-8a1a-2a9e29df896b" xlink:to="loc_us-gaap_NetIncomeLoss_019e2207-0a8b-7c25-80a3-7a1373dc0454" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_AdjustmentsToReconcileNetAssetsFromOperationsToCashProvidedByUsedInOperatingActivitiesAbstract_019e2207-0a8b-71cc-ab9f-e71c3b0fa2f0" xlink:href="main-20260630.xsd#main_AdjustmentsToReconcileNetAssetsFromOperationsToCashProvidedByUsedInOperatingActivitiesAbstract"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_019e2207-0a8b-7392-8a1a-2a9e29df896b" xlink:to="loc_main_AdjustmentsToReconcileNetAssetsFromOperationsToCashProvidedByUsedInOperatingActivitiesAbstract_019e2207-0a8b-71cc-ab9f-e71c3b0fa2f0" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_PaymentsToInvestmentsInPortfolioCompanies_019e2207-0a8b-7782-80c1-7d6d22d8a3ec" xlink:href="main-20260630.xsd#main_PaymentsToInvestmentsInPortfolioCompanies"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_main_AdjustmentsToReconcileNetAssetsFromOperationsToCashProvidedByUsedInOperatingActivitiesAbstract_019e2207-0a8b-71cc-ab9f-e71c3b0fa2f0" xlink:to="loc_main_PaymentsToInvestmentsInPortfolioCompanies_019e2207-0a8b-7782-80c1-7d6d22d8a3ec" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_ProceedsFromSalesAndRepaymentsOfDebtInvestmentsInPortfolioCompanies_019e2207-0a8b-728f-a3f0-74ffea6ef652" xlink:href="main-20260630.xsd#main_ProceedsFromSalesAndRepaymentsOfDebtInvestmentsInPortfolioCompanies"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_main_AdjustmentsToReconcileNetAssetsFromOperationsToCashProvidedByUsedInOperatingActivitiesAbstract_019e2207-0a8b-71cc-ab9f-e71c3b0fa2f0" xlink:to="loc_main_ProceedsFromSalesAndRepaymentsOfDebtInvestmentsInPortfolioCompanies_019e2207-0a8b-728f-a3f0-74ffea6ef652" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_ProceedsFromSalesAndReturnOfCapitalOfEquityInvestmentsInPortfolioCompanies_019e2207-0a8b-7e9c-a431-26da2b647572" xlink:href="main-20260630.xsd#main_ProceedsFromSalesAndReturnOfCapitalOfEquityInvestmentsInPortfolioCompanies"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_main_AdjustmentsToReconcileNetAssetsFromOperationsToCashProvidedByUsedInOperatingActivitiesAbstract_019e2207-0a8b-71cc-ab9f-e71c3b0fa2f0" xlink:to="loc_main_ProceedsFromSalesAndReturnOfCapitalOfEquityInvestmentsInPortfolioCompanies_019e2207-0a8b-7e9c-a431-26da2b647572" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtAndEquitySecuritiesUnrealizedGainLoss_019e2207-0a8b-77c1-9281-1790f4eecb39" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtAndEquitySecuritiesUnrealizedGainLoss"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_main_AdjustmentsToReconcileNetAssetsFromOperationsToCashProvidedByUsedInOperatingActivitiesAbstract_019e2207-0a8b-71cc-ab9f-e71c3b0fa2f0" xlink:to="loc_us-gaap_DebtAndEquitySecuritiesUnrealizedGainLoss_019e2207-0a8b-77c1-9281-1790f4eecb39" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtAndEquitySecuritiesRealizedGainLoss_019e2207-0a8b-78dd-bb01-c24624ab7ca3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtAndEquitySecuritiesRealizedGainLoss"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_main_AdjustmentsToReconcileNetAssetsFromOperationsToCashProvidedByUsedInOperatingActivitiesAbstract_019e2207-0a8b-71cc-ab9f-e71c3b0fa2f0" xlink:to="loc_us-gaap_DebtAndEquitySecuritiesRealizedGainLoss_019e2207-0a8b-78dd-bb01-c24624ab7ca3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_AccretionOfUnearnedIncome_019e2207-0a8b-7206-8ba2-d9ae200c65c6" xlink:href="main-20260630.xsd#main_AccretionOfUnearnedIncome"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_main_AdjustmentsToReconcileNetAssetsFromOperationsToCashProvidedByUsedInOperatingActivitiesAbstract_019e2207-0a8b-71cc-ab9f-e71c3b0fa2f0" xlink:to="loc_main_AccretionOfUnearnedIncome_019e2207-0a8b-7206-8ba2-d9ae200c65c6" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_PaymentInKindInterest_019e2207-0a8b-75ac-8741-87efa0f3bcc1" xlink:href="main-20260630.xsd#main_PaymentInKindInterest"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_main_AdjustmentsToReconcileNetAssetsFromOperationsToCashProvidedByUsedInOperatingActivitiesAbstract_019e2207-0a8b-71cc-ab9f-e71c3b0fa2f0" xlink:to="loc_main_PaymentInKindInterest_019e2207-0a8b-75ac-8741-87efa0f3bcc1" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_CumulativeDividendsNonCash_019e2207-0a8b-71e9-a5de-cb624656f3f6" xlink:href="main-20260630.xsd#main_CumulativeDividendsNonCash"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_main_AdjustmentsToReconcileNetAssetsFromOperationsToCashProvidedByUsedInOperatingActivitiesAbstract_019e2207-0a8b-71cc-ab9f-e71c3b0fa2f0" xlink:to="loc_main_CumulativeDividendsNonCash_019e2207-0a8b-71e9-a5de-cb624656f3f6" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensation_019e2207-0a8b-79ce-8db1-210868a02ece" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensation"/>
    <link:presentationArc order="9" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_main_AdjustmentsToReconcileNetAssetsFromOperationsToCashProvidedByUsedInOperatingActivitiesAbstract_019e2207-0a8b-71cc-ab9f-e71c3b0fa2f0" xlink:to="loc_us-gaap_ShareBasedCompensation_019e2207-0a8b-79ce-8db1-210868a02ece" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfFinancingCosts_019e2207-0a8b-79a5-afd0-c197c7d0c86f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AmortizationOfFinancingCosts"/>
    <link:presentationArc order="10" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_main_AdjustmentsToReconcileNetAssetsFromOperationsToCashProvidedByUsedInOperatingActivitiesAbstract_019e2207-0a8b-71cc-ab9f-e71c3b0fa2f0" xlink:to="loc_us-gaap_AmortizationOfFinancingCosts_019e2207-0a8b-79a5-afd0-c197c7d0c86f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_019e2207-0a8b-7c0e-a4ca-115a8a1e2f74" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DeferredIncomeTaxExpenseBenefit"/>
    <link:presentationArc order="11" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_main_AdjustmentsToReconcileNetAssetsFromOperationsToCashProvidedByUsedInOperatingActivitiesAbstract_019e2207-0a8b-71cc-ab9f-e71c3b0fa2f0" xlink:to="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_019e2207-0a8b-7c0e-a4ca-115a8a1e2f74" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_019e2207-0a8b-782e-936e-9198bdb3e839" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInOperatingCapitalAbstract"/>
    <link:presentationArc order="12" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_main_AdjustmentsToReconcileNetAssetsFromOperationsToCashProvidedByUsedInOperatingActivitiesAbstract_019e2207-0a8b-71cc-ab9f-e71c3b0fa2f0" xlink:to="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_019e2207-0a8b-782e-936e-9198bdb3e839" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_IncreaseDecreaseInInterestAndDividendReceivableAndOtherAssets_019e2207-0a8b-713c-b84b-f5988e7113e2" xlink:href="main-20260630.xsd#main_IncreaseDecreaseInInterestAndDividendReceivableAndOtherAssets"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_019e2207-0a8b-782e-936e-9198bdb3e839" xlink:to="loc_main_IncreaseDecreaseInInterestAndDividendReceivableAndOtherAssets_019e2207-0a8b-713c-b84b-f5988e7113e2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInInterestPayableNet_019e2207-0a8b-7446-b462-0d63e414450c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInInterestPayableNet"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_019e2207-0a8b-782e-936e-9198bdb3e839" xlink:to="loc_us-gaap_IncreaseDecreaseInInterestPayableNet_019e2207-0a8b-7446-b462-0d63e414450c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsPayableAndOtherOperatingLiabilities_019e2207-0a8b-785e-8f1b-faaf70a7edbd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInAccountsPayableAndOtherOperatingLiabilities"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_019e2207-0a8b-782e-936e-9198bdb3e839" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsPayableAndOtherOperatingLiabilities_019e2207-0a8b-785e-8f1b-faaf70a7edbd" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_IncreaseDecreaseInDeferredFeesAndOther_019e2207-0a8b-7863-9ecd-a44670f2781e" xlink:href="main-20260630.xsd#main_IncreaseDecreaseInDeferredFeesAndOther"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_019e2207-0a8b-782e-936e-9198bdb3e839" xlink:to="loc_main_IncreaseDecreaseInDeferredFeesAndOther_019e2207-0a8b-7863-9ecd-a44670f2781e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019e2207-0a8b-7ea9-9933-db8b0b5417ca" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_019e2207-0a8b-7392-8a1a-2a9e29df896b" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019e2207-0a8b-7ea9-9933-db8b0b5417ca" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019e2207-0a8b-75a2-b4b4-40108b6b686c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_019e688e-8d26-7082-b691-08b13b13a88d" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019e2207-0a8b-75a2-b4b4-40108b6b686c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfCommonStock_019e2207-0a8b-70f3-98c4-88250f80b875" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromIssuanceOfCommonStock"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019e2207-0a8b-75a2-b4b4-40108b6b686c" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfCommonStock_019e2207-0a8b-70f3-98c4-88250f80b875" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfUnsecuredDebt_019e2207-0a8b-7404-8daf-9690d2bd4d31" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromIssuanceOfUnsecuredDebt"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019e2207-0a8b-75a2-b4b4-40108b6b686c" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfUnsecuredDebt_019e2207-0a8b-7404-8daf-9690d2bd4d31" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfOrdinaryDividends_019e2207-0a8b-7350-92ca-b8611e79df47" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsOfOrdinaryDividends"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019e2207-0a8b-75a2-b4b4-40108b6b686c" xlink:to="loc_us-gaap_PaymentsOfOrdinaryDividends_019e2207-0a8b-7350-92ca-b8611e79df47" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromLinesOfCredit_019e2207-0a8b-7ee6-8984-b3ea1b9823d9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromLinesOfCredit"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019e2207-0a8b-75a2-b4b4-40108b6b686c" xlink:to="loc_us-gaap_ProceedsFromLinesOfCredit_019e2207-0a8b-7ee6-8984-b3ea1b9823d9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfLinesOfCredit_019e2207-0a8b-7288-adac-adc528341703" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RepaymentsOfLinesOfCredit"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019e2207-0a8b-75a2-b4b4-40108b6b686c" xlink:to="loc_us-gaap_RepaymentsOfLinesOfCredit_019e2207-0a8b-7288-adac-adc528341703" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_ProceedsFromDebtIssuancePremiumsNet_019e2207-0a8b-7207-b33c-795b94eb0d96" xlink:href="main-20260630.xsd#main_ProceedsFromDebtIssuancePremiumsNet"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019e2207-0a8b-75a2-b4b4-40108b6b686c" xlink:to="loc_main_ProceedsFromDebtIssuancePremiumsNet_019e2207-0a8b-7207-b33c-795b94eb0d96" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_019e6890-f1a3-7c97-8e7f-b5c72c0aec13" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019e2207-0a8b-75a2-b4b4-40108b6b686c" xlink:to="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_019e6890-f1a3-7c97-8e7f-b5c72c0aec13" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_019e2207-0a8b-72da-9611-1bbbfabbb386" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019e2207-0a8b-75a2-b4b4-40108b6b686c" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_019e2207-0a8b-72da-9611-1bbbfabbb386" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_019e2207-0a8b-7a6d-8dcf-432fda6a101c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_019e688e-8d26-7082-b691-08b13b13a88d" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_019e2207-0a8b-7a6d-8dcf-432fda6a101c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_019e2207-0a8b-7a09-b31c-1b1c248e2262" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_019e688e-8d26-7082-b691-08b13b13a88d" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_019e2207-0a8b-7a09-b31c-1b1c248e2262" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/periodStartLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_019e2207-0a8b-7b72-a615-0d5815721f71" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_019e688e-8d26-7082-b691-08b13b13a88d" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_019e2207-0a8b-7b72-a615-0d5815721f71" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/periodEndLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SupplementalCashFlowInformationAbstract_019e2207-0a8b-7162-925c-978994059277" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SupplementalCashFlowInformationAbstract"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_019e688e-8d26-7082-b691-08b13b13a88d" xlink:to="loc_us-gaap_SupplementalCashFlowInformationAbstract_019e2207-0a8b-7162-925c-978994059277" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestPaidNet_019e2207-0a8b-7a65-8a93-be01001bfdc1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestPaidNet"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SupplementalCashFlowInformationAbstract_019e2207-0a8b-7162-925c-978994059277" xlink:to="loc_us-gaap_InterestPaidNet_019e2207-0a8b-7a65-8a93-be01001bfdc1" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxesPaid_019e2207-0a8b-78e0-bc3f-c2e879426502" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeTaxesPaid"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SupplementalCashFlowInformationAbstract_019e2207-0a8b-7162-925c-978994059277" xlink:to="loc_us-gaap_IncomeTaxesPaid_019e2207-0a8b-78e0-bc3f-c2e879426502" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncashInvestingAndFinancingItemsAbstract_019e2207-0a8b-7bee-9430-effc39b5d86b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NoncashInvestingAndFinancingItemsAbstract"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_019e688e-8d26-7082-b691-08b13b13a88d" xlink:to="loc_us-gaap_NoncashInvestingAndFinancingItemsAbstract_019e2207-0a8b-7bee-9430-effc39b5d86b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssued1_019e2207-0a8b-7f1d-ae7a-edabef2cc1bd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssued1"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NoncashInvestingAndFinancingItemsAbstract_019e2207-0a8b-7bee-9430-effc39b5d86b" xlink:to="loc_us-gaap_StockIssued1_019e2207-0a8b-7f1d-ae7a-edabef2cc1bd" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.mainstcapital.com/role/ConsolidatedScheduleofInvestments" xlink:type="simple" xlink:href="main-20260630.xsd#ConsolidatedScheduleofInvestments"/>
  <link:presentationLink xlink:role="http://www.mainstcapital.com/role/ConsolidatedScheduleofInvestments" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfInvestmentsAbstract_019e2207-0a8b-77a2-b181-d8ead56695b8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfInvestmentsAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfInvestmentsTable_019e2207-0a8b-7ee6-aae4-d8342fe763c3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfInvestmentsTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfInvestmentsAbstract_019e2207-0a8b-77a2-b181-d8ead56695b8" xlink:to="loc_us-gaap_ScheduleOfInvestmentsTable_019e2207-0a8b-7ee6-aae4-d8342fe763c3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentIdentifierAxis_019e2207-0a8b-7b64-9237-4487dd9f54c6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentIdentifierAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfInvestmentsTable_019e2207-0a8b-7ee6-aae4-d8342fe763c3" xlink:to="loc_us-gaap_InvestmentIdentifierAxis_019e2207-0a8b-7b64-9237-4487dd9f54c6" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentIssuerNameAxis_019e2207-0a8b-73c1-a2a1-93ed45ccf5b5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentIssuerNameAxis"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfInvestmentsTable_019e2207-0a8b-7ee6-aae4-d8342fe763c3" xlink:to="loc_us-gaap_InvestmentIssuerNameAxis_019e2207-0a8b-73c1-a2a1-93ed45ccf5b5" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentIssuerNameDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameAxis_019e2207-0a8b-73c1-a2a1-93ed45ccf5b5" xlink:to="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_AmericanNutsLLCMember_019e2207-0a8b-7658-86b5-0a30a5cde368" xlink:href="main-20260630.xsd#main_AmericanNutsLLCMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_AmericanNutsLLCMember_019e2207-0a8b-7658-86b5-0a30a5cde368" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_AnalyticalSystemsKecoHoldingsLLCMember_019e2207-0a8b-7eca-8c7a-ec91e1712a1c" xlink:href="main-20260630.xsd#main_AnalyticalSystemsKecoHoldingsLLCMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_AnalyticalSystemsKecoHoldingsLLCMember_019e2207-0a8b-7eca-8c7a-ec91e1712a1c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_ASCInterestsLLCMember_019e2207-0a8b-7c85-b06d-569c77487537" xlink:href="main-20260630.xsd#main_ASCInterestsLLCMember"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_ASCInterestsLLCMember_019e2207-0a8b-7c85-b06d-569c77487537" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_BatjerTopCoLLCMember_019e2207-0a8b-727b-93c1-8459a9726b76" xlink:href="main-20260630.xsd#main_BatjerTopCoLLCMember"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_BatjerTopCoLLCMember_019e2207-0a8b-727b-93c1-8459a9726b76" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_BDBHoldingsLLCMember_019e2207-0a8b-709b-918e-999324ae10d6" xlink:href="main-20260630.xsd#main_BDBHoldingsLLCMember"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_BDBHoldingsLLCMember_019e2207-0a8b-709b-918e-999324ae10d6" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_BettercloudIncMember_019e2207-0b5f-7856-96ce-99d2fd4be02b" xlink:href="main-20260630.xsd#main_BettercloudIncMember"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_BettercloudIncMember_019e2207-0b5f-7856-96ce-99d2fd4be02b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_BolderPantherGroupLLCMember_019e2207-0a8b-7ea1-b9ba-f3c8e1da5b0a" xlink:href="main-20260630.xsd#main_BolderPantherGroupLLCMember"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_BolderPantherGroupLLCMember_019e2207-0a8b-7ea1-b9ba-f3c8e1da5b0a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_BrewerCraneHoldingsLLCMember_019e2207-0a8b-7368-9b9b-98f7260c0110" xlink:href="main-20260630.xsd#main_BrewerCraneHoldingsLLCMember"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_BrewerCraneHoldingsLLCMember_019e2207-0a8b-7368-9b9b-98f7260c0110" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_BridgeCapitalSolutionsCorporationMember_019e2207-0a8b-77fa-ae60-edbc46a8be8e" xlink:href="main-20260630.xsd#main_BridgeCapitalSolutionsCorporationMember"/>
    <link:presentationArc order="9" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_BridgeCapitalSolutionsCorporationMember_019e2207-0a8b-77fa-ae60-edbc46a8be8e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_CaliforniaSplendorHoldingsLLCMember_019e2207-0a8b-74d8-adb8-3db6fb8990cf" xlink:href="main-20260630.xsd#main_CaliforniaSplendorHoldingsLLCMember"/>
    <link:presentationArc order="10" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_CaliforniaSplendorHoldingsLLCMember_019e2207-0a8b-74d8-adb8-3db6fb8990cf" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_CentreTechnologiesHoldingsLLCMember_019e2207-0a8b-7534-ae7d-8a27bf8bf391" xlink:href="main-20260630.xsd#main_CentreTechnologiesHoldingsLLCMember"/>
    <link:presentationArc order="11" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_CentreTechnologiesHoldingsLLCMember_019e2207-0a8b-7534-ae7d-8a27bf8bf391" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_ChamberlinHoldingLLCMember_019e2207-0a8b-7ba8-a9d7-2f5cc4781582" xlink:href="main-20260630.xsd#main_ChamberlinHoldingLLCMember"/>
    <link:presentationArc order="12" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_ChamberlinHoldingLLCMember_019e2207-0a8b-7ba8-a9d7-2f5cc4781582" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_CharpsLLCMember_019e2207-0a8b-73a6-8496-1a7591e34861" xlink:href="main-20260630.xsd#main_CharpsLLCMember"/>
    <link:presentationArc order="13" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_CharpsLLCMember_019e2207-0a8b-73a6-8496-1a7591e34861" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_CladRexSteelLLCMember_019e2207-0a8b-72d5-9aae-8161ceebd4aa" xlink:href="main-20260630.xsd#main_CladRexSteelLLCMember"/>
    <link:presentationArc order="14" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_CladRexSteelLLCMember_019e2207-0a8b-72d5-9aae-8161ceebd4aa" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_CodyPoolsIncMember_019e2207-0a8b-7e47-a440-e90837072e35" xlink:href="main-20260630.xsd#main_CodyPoolsIncMember"/>
    <link:presentationArc order="15" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_CodyPoolsIncMember_019e2207-0a8b-7e47-a440-e90837072e35" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_ColonialElectricCompanyLLCMember_019e2207-0a8b-7e2c-ae5c-75452fb4db60" xlink:href="main-20260630.xsd#main_ColonialElectricCompanyLLCMember"/>
    <link:presentationArc order="16" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_ColonialElectricCompanyLLCMember_019e2207-0a8b-7e2c-ae5c-75452fb4db60" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_CompareNetworksTopcoLLCMember_019e2207-0a8b-7221-ad8f-98f856524010" xlink:href="main-20260630.xsd#main_CompareNetworksTopcoLLCMember"/>
    <link:presentationArc order="17" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_CompareNetworksTopcoLLCMember_019e2207-0a8b-7221-ad8f-98f856524010" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_CompassSystemsSalesLLCMember_019e2207-0a8b-7653-8226-b799cdb217ce" xlink:href="main-20260630.xsd#main_CompassSystemsSalesLLCMember"/>
    <link:presentationArc order="18" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_CompassSystemsSalesLLCMember_019e2207-0a8b-7653-8226-b799cdb217ce" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_CybermediaTechnologiesLLCMember_019e2207-0a8b-7827-b5f0-06ed5054e02f" xlink:href="main-20260630.xsd#main_CybermediaTechnologiesLLCMember"/>
    <link:presentationArc order="19" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_CybermediaTechnologiesLLCMember_019e2207-0a8b-7827-b5f0-06ed5054e02f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_DatacomLLCMember_019e2207-0a8b-72ec-83dd-b449caf56294" xlink:href="main-20260630.xsd#main_DatacomLLCMember"/>
    <link:presentationArc order="20" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_DatacomLLCMember_019e2207-0a8b-72ec-83dd-b449caf56294" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_DigitalProductsHoldingsLLCMember_019e2207-0a8b-755f-ba13-aae7ae361772" xlink:href="main-20260630.xsd#main_DigitalProductsHoldingsLLCMember"/>
    <link:presentationArc order="21" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_DigitalProductsHoldingsLLCMember_019e2207-0a8b-755f-ba13-aae7ae361772" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_DirectMarketingSolutionsIncMember_019e2207-0a8b-7936-b722-0176b361a546" xlink:href="main-20260630.xsd#main_DirectMarketingSolutionsIncMember"/>
    <link:presentationArc order="22" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_DirectMarketingSolutionsIncMember_019e2207-0a8b-7936-b722-0176b361a546" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_DoralHoldingsLLCMember_019e2207-0a8b-7cb9-99ce-6590822f9915" xlink:href="main-20260630.xsd#main_DoralHoldingsLLCMember"/>
    <link:presentationArc order="23" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_DoralHoldingsLLCMember_019e2207-0a8b-7cb9-99ce-6590822f9915" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_ElginAcquireCoLLCMember_019e2207-0a8b-74c0-b63e-3b11bf7b1198" xlink:href="main-20260630.xsd#main_ElginAcquireCoLLCMember"/>
    <link:presentationArc order="24" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_ElginAcquireCoLLCMember_019e2207-0a8b-74c0-b63e-3b11bf7b1198" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_FlameKingHoldingsLLCMember_019e2207-0a8b-7bfe-a074-13573b27b822" xlink:href="main-20260630.xsd#main_FlameKingHoldingsLLCMember"/>
    <link:presentationArc order="25" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_FlameKingHoldingsLLCMember_019e2207-0a8b-7bfe-a074-13573b27b822" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_GamberJohnsonHoldingsLLCMember_019e2207-0a8b-7814-b6bd-dc474911daba" xlink:href="main-20260630.xsd#main_GamberJohnsonHoldingsLLCMember"/>
    <link:presentationArc order="26" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_GamberJohnsonHoldingsLLCMember_019e2207-0a8b-7814-b6bd-dc474911daba" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_GRTRubberTechnologiesLLCMember_019e2207-0a8b-7eb5-8845-4b52fa6c8fa1" xlink:href="main-20260630.xsd#main_GRTRubberTechnologiesLLCMember"/>
    <link:presentationArc order="27" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_GRTRubberTechnologiesLLCMember_019e2207-0a8b-7eb5-8845-4b52fa6c8fa1" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_HarrisPrestonFundInvestmentsMember_019e2207-0a8b-78ff-bc65-3484170a0bca" xlink:href="main-20260630.xsd#main_HarrisPrestonFundInvestmentsMember"/>
    <link:presentationArc order="28" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_HarrisPrestonFundInvestmentsMember_019e2207-0a8b-78ff-bc65-3484170a0bca" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_IGInvestorLLCMember_019e2207-0a8b-7a46-abdd-b7f009eee4c0" xlink:href="main-20260630.xsd#main_IGInvestorLLCMember"/>
    <link:presentationArc order="29" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_IGInvestorLLCMember_019e2207-0a8b-7a46-abdd-b7f009eee4c0" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_JensenJewelersOfIdahoLLCMember_019e2207-0a8b-7dee-bd51-b158d411b06a" xlink:href="main-20260630.xsd#main_JensenJewelersOfIdahoLLCMember"/>
    <link:presentationArc order="30" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_JensenJewelersOfIdahoLLCMember_019e2207-0a8b-7dee-bd51-b158d411b06a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_JorVetHoldingsLLCMember_019e2207-0a8b-71f1-863e-bc5b507d55f2" xlink:href="main-20260630.xsd#main_JorVetHoldingsLLCMember"/>
    <link:presentationArc order="31" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_JorVetHoldingsLLCMember_019e2207-0a8b-71f1-863e-bc5b507d55f2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_JTIElectricalMechanicalLLCMember_019e2207-0a8b-7455-b49e-244422aeb8fd" xlink:href="main-20260630.xsd#main_JTIElectricalMechanicalLLCMember"/>
    <link:presentationArc order="32" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_JTIElectricalMechanicalLLCMember_019e2207-0a8b-7455-b49e-244422aeb8fd" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_KBKIndustriesLLCMember_019e2207-0a8b-7e92-b2b2-98ff479401ac" xlink:href="main-20260630.xsd#main_KBKIndustriesLLCMember"/>
    <link:presentationArc order="33" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_KBKIndustriesLLCMember_019e2207-0a8b-7e92-b2b2-98ff479401ac" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_KickhaeferManufacturingCompanyLLCMember_019e2207-0a8b-75b2-8746-8fad984c1e3d" xlink:href="main-20260630.xsd#main_KickhaeferManufacturingCompanyLLCMember"/>
    <link:presentationArc order="34" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_KickhaeferManufacturingCompanyLLCMember_019e2207-0a8b-75b2-8746-8fad984c1e3d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_LegacySwimGroupMember_019e2207-0b5f-72ed-8dda-a4be1c740aa4" xlink:href="main-20260630.xsd#main_LegacySwimGroupMember"/>
    <link:presentationArc order="35" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_LegacySwimGroupMember_019e2207-0b5f-72ed-8dda-a4be1c740aa4" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_MetalformingHoldingsLLCMember_019e2207-0a8b-732b-aee0-65dba373be4f" xlink:href="main-20260630.xsd#main_MetalformingHoldingsLLCMember"/>
    <link:presentationArc order="36" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_MetalformingHoldingsLLCMember_019e2207-0a8b-732b-aee0-65dba373be4f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_MoffittHoldingsLLCMember_019e2207-0a8b-7d36-b032-aae6c8d8f956" xlink:href="main-20260630.xsd#main_MoffittHoldingsLLCMember"/>
    <link:presentationArc order="37" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_MoffittHoldingsLLCMember_019e2207-0a8b-7d36-b032-aae6c8d8f956" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_MSPrivateLoanFundILPMember_019e2207-0a8b-78d9-b3fa-01835d6e960f" xlink:href="main-20260630.xsd#main_MSPrivateLoanFundILPMember"/>
    <link:presentationArc order="38" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_MSPrivateLoanFundILPMember_019e2207-0a8b-78d9-b3fa-01835d6e960f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_MSPrivateLoanFundIILPMember_019e2207-0a8b-7c07-806f-b32121efaff6" xlink:href="main-20260630.xsd#main_MSPrivateLoanFundIILPMember"/>
    <link:presentationArc order="39" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_MSPrivateLoanFundIILPMember_019e2207-0a8b-7c07-806f-b32121efaff6" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_MSCIncomeFundInc.Member_019e2207-0b5f-72a3-bf8a-54f53b717065" xlink:href="main-20260630.xsd#main_MSCIncomeFundInc.Member"/>
    <link:presentationArc order="40" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_MSCIncomeFundInc.Member_019e2207-0b5f-72a3-bf8a-54f53b717065" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_MVIMSOLLCMember_019e2207-0a8b-7234-b652-237c75a0349d" xlink:href="main-20260630.xsd#main_MVIMSOLLCMember"/>
    <link:presentationArc order="41" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_MVIMSOLLCMember_019e2207-0a8b-7234-b652-237c75a0349d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_NAPCOPrecastLLCMember_019e2207-0b5f-7b8d-a2e6-0de9d314a473" xlink:href="main-20260630.xsd#main_NAPCOPrecastLLCMember"/>
    <link:presentationArc order="42" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_NAPCOPrecastLLCMember_019e2207-0b5f-7b8d-a2e6-0de9d314a473" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_NelloIndustriesInvestcoLLCMember_019e2207-0a8b-7a7b-a9bc-d0332f83b451" xlink:href="main-20260630.xsd#main_NelloIndustriesInvestcoLLCMember"/>
    <link:presentationArc order="43" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_NelloIndustriesInvestcoLLCMember_019e2207-0a8b-7a7b-a9bc-d0332f83b451" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_NRPJonesLLCMember_019e2207-0a8b-780f-9326-44db05c1f04b" xlink:href="main-20260630.xsd#main_NRPJonesLLCMember"/>
    <link:presentationArc order="44" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_NRPJonesLLCMember_019e2207-0a8b-780f-9326-44db05c1f04b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_NuStepLLCMember_019e2207-0a8b-7cb6-bfda-102928392d11" xlink:href="main-20260630.xsd#main_NuStepLLCMember"/>
    <link:presentationArc order="45" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_NuStepLLCMember_019e2207-0a8b-7cb6-bfda-102928392d11" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_OMiTopcoLLCMember_019e2207-0a8b-70f8-96d2-64fad293f5e8" xlink:href="main-20260630.xsd#main_OMiTopcoLLCMember"/>
    <link:presentationArc order="46" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_OMiTopcoLLCMember_019e2207-0a8b-70f8-96d2-64fad293f5e8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_OrttechHoldingsLLCMember_019e2207-0a8b-70cf-baf2-31e2a107bee4" xlink:href="main-20260630.xsd#main_OrttechHoldingsLLCMember"/>
    <link:presentationArc order="47" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_OrttechHoldingsLLCMember_019e2207-0a8b-70cf-baf2-31e2a107bee4" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_PinnacleTopCoLLCMember_019e2207-0a8b-7b9c-bf5e-986e8007922e" xlink:href="main-20260630.xsd#main_PinnacleTopCoLLCMember"/>
    <link:presentationArc order="48" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_PinnacleTopCoLLCMember_019e2207-0a8b-7b9c-bf5e-986e8007922e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_PPLRVsIncMember_019e2207-0a8b-7e32-b34b-784b54d67776" xlink:href="main-20260630.xsd#main_PPLRVsIncMember"/>
    <link:presentationArc order="49" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_PPLRVsIncMember_019e2207-0a8b-7e32-b34b-784b54d67776" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_PrincipleEnvironmentalLLCMember_019e2207-0a8b-74ef-96a9-d7731ab5eea2" xlink:href="main-20260630.xsd#main_PrincipleEnvironmentalLLCMember"/>
    <link:presentationArc order="50" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_PrincipleEnvironmentalLLCMember_019e2207-0a8b-74ef-96a9-d7731ab5eea2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_RobbinsBrosJewelryIncMember_019e2207-0a8b-702c-86db-e04472dc91e5" xlink:href="main-20260630.xsd#main_RobbinsBrosJewelryIncMember"/>
    <link:presentationArc order="51" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_RobbinsBrosJewelryIncMember_019e2207-0a8b-702c-86db-e04472dc91e5" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_ShiftTransitParentCoLPMember_019fa7f5-a3ba-7c18-b4cc-0d0061d0b24f" xlink:href="main-20260630.xsd#main_ShiftTransitParentCoLPMember"/>
    <link:presentationArc order="52" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_ShiftTransitParentCoLPMember_019fa7f5-a3ba-7c18-b4cc-0d0061d0b24f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_SpringEngineeringHoldingsLLCMember_019e2207-0b5f-74e2-8897-6830e888749d" xlink:href="main-20260630.xsd#main_SpringEngineeringHoldingsLLCMember"/>
    <link:presentationArc order="53" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_SpringEngineeringHoldingsLLCMember_019e2207-0b5f-74e2-8897-6830e888749d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_TedderIndustriesLLCMember_019e2207-0a8b-72d2-84ba-02b0b62fbcff" xlink:href="main-20260630.xsd#main_TedderIndustriesLLCMember"/>
    <link:presentationArc order="54" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_TedderIndustriesLLCMember_019e2207-0a8b-72d2-84ba-02b0b62fbcff" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_TeleverdeLLCMember_019e2207-0a8b-715a-8586-84e4cf2ddbed" xlink:href="main-20260630.xsd#main_TeleverdeLLCMember"/>
    <link:presentationArc order="55" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_TeleverdeLLCMember_019e2207-0a8b-715a-8586-84e4cf2ddbed" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_TrantechRadiatorTopcoLLCMember_019e2207-0a8b-769d-8ace-9a79049b7948" xlink:href="main-20260630.xsd#main_TrantechRadiatorTopcoLLCMember"/>
    <link:presentationArc order="56" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_TrantechRadiatorTopcoLLCMember_019e2207-0a8b-769d-8ace-9a79049b7948" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_TrinityMedicalHoldingsLLCMember_019e2207-0b5f-7baa-904b-2f8bc83c7941" xlink:href="main-20260630.xsd#main_TrinityMedicalHoldingsLLCMember"/>
    <link:presentationArc order="57" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_TrinityMedicalHoldingsLLCMember_019e2207-0b5f-7baa-904b-2f8bc83c7941" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_VictoryEnergyOperationsLLCMember_019e2207-0a8b-7c45-a094-4e3d01665b93" xlink:href="main-20260630.xsd#main_VictoryEnergyOperationsLLCMember"/>
    <link:presentationArc order="58" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_VictoryEnergyOperationsLLCMember_019e2207-0a8b-7c45-a094-4e3d01665b93" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_VolusionLLCMember_019e2207-0a8b-76d7-bbb9-ff117873596b" xlink:href="main-20260630.xsd#main_VolusionLLCMember"/>
    <link:presentationArc order="59" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_VolusionLLCMember_019e2207-0a8b-76d7-bbb9-ff117873596b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_VVSHoldcoLLCMember_019e2207-0a8b-702b-924e-3fa78ec81f9d" xlink:href="main-20260630.xsd#main_VVSHoldcoLLCMember"/>
    <link:presentationArc order="60" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_VVSHoldcoLLCMember_019e2207-0a8b-702b-924e-3fa78ec81f9d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_ZieglersNYPDLLCMember_019e2207-0a8b-7e0c-a925-373239a5d1b6" xlink:href="main-20260630.xsd#main_ZieglersNYPDLLCMember"/>
    <link:presentationArc order="61" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_ZieglersNYPDLLCMember_019e2207-0a8b-7e0c-a925-373239a5d1b6" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_AACHoldingsIncMember_019e2207-0a8b-7e56-8784-269fd3a8a8d7" xlink:href="main-20260630.xsd#main_AACHoldingsIncMember"/>
    <link:presentationArc order="62" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_AACHoldingsIncMember_019e2207-0a8b-7e56-8784-269fd3a8a8d7" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_BLIAcquisitionLLCMember_019e2207-0b5f-774c-bc3b-a3c730cfc736" xlink:href="main-20260630.xsd#main_BLIAcquisitionLLCMember"/>
    <link:presentationArc order="63" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_BLIAcquisitionLLCMember_019e2207-0b5f-774c-bc3b-a3c730cfc736" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_BoccellaPrecastProductsLLCMember_019e2207-0a8b-7f60-9972-278c076657b9" xlink:href="main-20260630.xsd#main_BoccellaPrecastProductsLLCMember"/>
    <link:presentationArc order="64" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_BoccellaPrecastProductsLLCMember_019e2207-0a8b-7f60-9972-278c076657b9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_BucaCLLCMember_019e2207-0a8b-7a9e-be17-5a7bca6e40f3" xlink:href="main-20260630.xsd#main_BucaCLLCMember"/>
    <link:presentationArc order="65" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_BucaCLLCMember_019e2207-0a8b-7a9e-be17-5a7bca6e40f3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_CareerTeamHoldingsLLCMember_019e2207-0a8b-7011-a74d-da010e5fe413" xlink:href="main-20260630.xsd#main_CareerTeamHoldingsLLCMember"/>
    <link:presentationArc order="66" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_CareerTeamHoldingsLLCMember_019e2207-0a8b-7011-a74d-da010e5fe413" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_CenterPeakHoldingsLLCMember_019e2207-0a8b-7458-9f3d-ef7fe1334103" xlink:href="main-20260630.xsd#main_CenterPeakHoldingsLLCMember"/>
    <link:presentationArc order="67" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_CenterPeakHoldingsLLCMember_019e2207-0a8b-7458-9f3d-ef7fe1334103" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_CGMSParentLLCMember_019e2207-0b5f-72e8-bb64-2ee6e31a89e8" xlink:href="main-20260630.xsd#main_CGMSParentLLCMember"/>
    <link:presentationArc order="68" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_CGMSParentLLCMember_019e2207-0b5f-72e8-bb64-2ee6e31a89e8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_ConnectTelecommunicationsSolutionsHoldingsInc.Member_019e2207-0b5f-75a5-bc8f-53a5b3a99559" xlink:href="main-20260630.xsd#main_ConnectTelecommunicationsSolutionsHoldingsInc.Member"/>
    <link:presentationArc order="69" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_ConnectTelecommunicationsSolutionsHoldingsInc.Member_019e2207-0b5f-75a5-bc8f-53a5b3a99559" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_DMAIndustriesLLCMember_019e2207-0b5f-754f-b2b8-12539c6bf01a" xlink:href="main-20260630.xsd#main_DMAIndustriesLLCMember"/>
    <link:presentationArc order="70" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_DMAIndustriesLLCMember_019e2207-0b5f-754f-b2b8-12539c6bf01a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_DosRiosPartnersMember_019e2207-0b5f-78eb-8cf3-5cef2d079155" xlink:href="main-20260630.xsd#main_DosRiosPartnersMember"/>
    <link:presentationArc order="71" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_DosRiosPartnersMember_019e2207-0b5f-78eb-8cf3-5cef2d079155" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_FCCIntermediateHoldcoLLCMember_019e2207-0b5f-74fb-aa0c-0d20a9a6a013" xlink:href="main-20260630.xsd#main_FCCIntermediateHoldcoLLCMember"/>
    <link:presentationArc order="72" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_FCCIntermediateHoldcoLLCMember_019e2207-0b5f-74fb-aa0c-0d20a9a6a013" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_FreeportFinancialFundsMember_019e2207-0b5f-75f8-9e6d-c490f9fc402c" xlink:href="main-20260630.xsd#main_FreeportFinancialFundsMember"/>
    <link:presentationArc order="73" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_FreeportFinancialFundsMember_019e2207-0b5f-75f8-9e6d-c490f9fc402c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_FRGAcquireCoLLCMember_019e2207-0b5f-7c45-bdf9-97124c2377b5" xlink:href="main-20260630.xsd#main_FRGAcquireCoLLCMember"/>
    <link:presentationArc order="74" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_FRGAcquireCoLLCMember_019e2207-0b5f-7c45-bdf9-97124c2377b5" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_GFGGroupLLCMember_019e2207-0b5f-788d-b564-57c30b2a8662" xlink:href="main-20260630.xsd#main_GFGGroupLLCMember"/>
    <link:presentationArc order="75" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_GFGGroupLLCMember_019e2207-0b5f-788d-b564-57c30b2a8662" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_GulfManufacturingLLCMember_019e2207-0b5f-70fe-a796-b52c11611724" xlink:href="main-20260630.xsd#main_GulfManufacturingLLCMember"/>
    <link:presentationArc order="76" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_GulfManufacturingLLCMember_019e2207-0b5f-70fe-a796-b52c11611724" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_HarrisPrestonFundInvestmentsOneMember_019fb285-19c1-7967-9e52-2bb530ad4414" xlink:href="main-20260630.xsd#main_HarrisPrestonFundInvestmentsOneMember"/>
    <link:presentationArc order="77" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_HarrisPrestonFundInvestmentsOneMember_019fb285-19c1-7967-9e52-2bb530ad4414" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_HawkRidgeSystemsLLCMember_019e2207-0b5f-7f44-9177-3b79b6df18f0" xlink:href="main-20260630.xsd#main_HawkRidgeSystemsLLCMember"/>
    <link:presentationArc order="78" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_HawkRidgeSystemsLLCMember_019e2207-0b5f-7f44-9177-3b79b6df18f0" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_HoustonPlatingAndCoatingsLLCMember_019e2207-0b5f-79b4-beec-2f48bd518074" xlink:href="main-20260630.xsd#main_HoustonPlatingAndCoatingsLLCMember"/>
    <link:presentationArc order="79" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_HoustonPlatingAndCoatingsLLCMember_019e2207-0b5f-79b4-beec-2f48bd518074" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_InfinityX1HoldingsLLCMember_019e2207-0b5f-7765-824d-bdd1a4e03522" xlink:href="main-20260630.xsd#main_InfinityX1HoldingsLLCMember"/>
    <link:presentationArc order="80" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_InfinityX1HoldingsLLCMember_019e2207-0b5f-7765-824d-bdd1a4e03522" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_IntegralEnergyServicesMember_019e2207-0b5f-7fbf-9ea1-d836739d3149" xlink:href="main-20260630.xsd#main_IntegralEnergyServicesMember"/>
    <link:presentationArc order="81" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_IntegralEnergyServicesMember_019e2207-0b5f-7fbf-9ea1-d836739d3149" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_IronMainInvestmentsLLCMember_019e2207-0b5f-73ea-97bf-97c36d70bb10" xlink:href="main-20260630.xsd#main_IronMainInvestmentsLLCMember"/>
    <link:presentationArc order="82" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_IronMainInvestmentsLLCMember_019e2207-0b5f-73ea-97bf-97c36d70bb10" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_ITAHoldingsGroupLLCMember_019e2207-0b5f-784c-b2d1-433d89c65dce" xlink:href="main-20260630.xsd#main_ITAHoldingsGroupLLCMember"/>
    <link:presentationArc order="83" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_ITAHoldingsGroupLLCMember_019e2207-0b5f-784c-b2d1-433d89c65dce" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_KennedyFabHoldCoLLCMember_019e2207-0b5f-7f91-a791-20362fa6dac5" xlink:href="main-20260630.xsd#main_KennedyFabHoldCoLLCMember"/>
    <link:presentationArc order="84" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_KennedyFabHoldCoLLCMember_019e2207-0b5f-7f91-a791-20362fa6dac5" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_KMSLLCMember_019e2207-0b5f-7bf1-90d5-d8838fa1af67" xlink:href="main-20260630.xsd#main_KMSLLCMember"/>
    <link:presentationArc order="85" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_KMSLLCMember_019e2207-0b5f-7bf1-90d5-d8838fa1af67" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_MillsFleetFarmGroupLLCMember_019e2207-0b5f-7c31-a770-085d26b3c381" xlink:href="main-20260630.xsd#main_MillsFleetFarmGroupLLCMember"/>
    <link:presentationArc order="86" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_MillsFleetFarmGroupLLCMember_019e2207-0b5f-7c31-a770-085d26b3c381" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_MoneyThumbAcquisitionLLCMember_019e2207-0b5f-7a57-96da-f8811d492908" xlink:href="main-20260630.xsd#main_MoneyThumbAcquisitionLLCMember"/>
    <link:presentationArc order="87" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_MoneyThumbAcquisitionLLCMember_019e2207-0b5f-7a57-96da-f8811d492908" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_NearshoreAcquireCoLLCMember_019e2207-0b5f-78fc-b0bd-5849107ca544" xlink:href="main-20260630.xsd#main_NearshoreAcquireCoLLCMember"/>
    <link:presentationArc order="88" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_NearshoreAcquireCoLLCMember_019e2207-0b5f-78fc-b0bd-5849107ca544" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_OnAssetIntelligenceIncMember_019e2207-0b5f-717f-9575-57ea8352c49d" xlink:href="main-20260630.xsd#main_OnAssetIntelligenceIncMember"/>
    <link:presentationArc order="89" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_OnAssetIntelligenceIncMember_019e2207-0b5f-717f-9575-57ea8352c49d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_RAOutdoorsLLCMember_019e2207-0b5f-7957-83d1-ddcf560f6def" xlink:href="main-20260630.xsd#main_RAOutdoorsLLCMember"/>
    <link:presentationArc order="90" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_RAOutdoorsLLCMember_019e2207-0b5f-7957-83d1-ddcf560f6def" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_RevenueRecoveryHoldingsLLCMember_019e2207-0b5f-72f4-b12e-c8e25e1440b8" xlink:href="main-20260630.xsd#main_RevenueRecoveryHoldingsLLCMember"/>
    <link:presentationArc order="91" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_RevenueRecoveryHoldingsLLCMember_019e2207-0b5f-72f4-b12e-c8e25e1440b8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_RFGAcquireCoLLCMember_019e2207-0b5f-7da9-b2c7-9c38e134417f" xlink:href="main-20260630.xsd#main_RFGAcquireCoLLCMember"/>
    <link:presentationArc order="92" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_RFGAcquireCoLLCMember_019e2207-0b5f-7da9-b2c7-9c38e134417f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_SIEastLLCMember_019e2207-0b5f-7831-a2fa-924510a90c05" xlink:href="main-20260630.xsd#main_SIEastLLCMember"/>
    <link:presentationArc order="93" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_SIEastLLCMember_019e2207-0b5f-7831-a2fa-924510a90c05" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_SlickInnovationsLLCMember_019e2207-0b5f-7907-9fb6-372ef733313c" xlink:href="main-20260630.xsd#main_SlickInnovationsLLCMember"/>
    <link:presentationArc order="94" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_SlickInnovationsLLCMember_019e2207-0b5f-7907-9fb6-372ef733313c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_SpecializedAviationHoldingsLLCMember_019e2207-0b5f-7033-8c40-16d27838fcae" xlink:href="main-20260630.xsd#main_SpecializedAviationHoldingsLLCMember"/>
    <link:presentationArc order="95" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_SpecializedAviationHoldingsLLCMember_019e2207-0b5f-7033-8c40-16d27838fcae" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_StudentResourceCenterLLCMember_019e2207-0b5f-7ba7-8038-488465fee08b" xlink:href="main-20260630.xsd#main_StudentResourceCenterLLCMember"/>
    <link:presentationArc order="96" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_StudentResourceCenterLLCMember_019e2207-0b5f-7ba7-8038-488465fee08b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_TheAffiliatiNetworkLLCMember_019e2207-0b5f-72d1-9547-ee2096981e10" xlink:href="main-20260630.xsd#main_TheAffiliatiNetworkLLCMember"/>
    <link:presentationArc order="97" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_TheAffiliatiNetworkLLCMember_019e2207-0b5f-72d1-9547-ee2096981e10" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_UniTekGlobalServicesIncMember_019e2207-0b5f-776c-a873-9a9d58b7926f" xlink:href="main-20260630.xsd#main_UniTekGlobalServicesIncMember"/>
    <link:presentationArc order="98" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_UniTekGlobalServicesIncMember_019e2207-0b5f-776c-a873-9a9d58b7926f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_UrgentDSOLLCMember_019e2207-0b5f-7bca-ab08-387218625028" xlink:href="main-20260630.xsd#main_UrgentDSOLLCMember"/>
    <link:presentationArc order="99" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_UrgentDSOLLCMember_019e2207-0b5f-7bca-ab08-387218625028" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_WorldMicroHoldingsLLCMember_019e2207-0b5f-7154-b153-6e0dda70b922" xlink:href="main-20260630.xsd#main_WorldMicroHoldingsLLCMember"/>
    <link:presentationArc order="100" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_WorldMicroHoldingsLLCMember_019e2207-0b5f-7154-b153-6e0dda70b922" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_AdamsPublishingGroupLLCMember_019e2207-0b5f-78a5-bba2-6abd5d1d61f3" xlink:href="main-20260630.xsd#main_AdamsPublishingGroupLLCMember"/>
    <link:presentationArc order="101" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_AdamsPublishingGroupLLCMember_019e2207-0b5f-78a5-bba2-6abd5d1d61f3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_AGSAmericanGlassServicesAcquisitionLLCMember_019e2207-0b5f-78e7-8d8a-158362c149ac" xlink:href="main-20260630.xsd#main_AGSAmericanGlassServicesAcquisitionLLCMember"/>
    <link:presentationArc order="102" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_AGSAmericanGlassServicesAcquisitionLLCMember_019e2207-0b5f-78e7-8d8a-158362c149ac" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_AiroPurchaserInc.Member_019e2207-0b5f-71b8-afe0-0a760320ed27" xlink:href="main-20260630.xsd#main_AiroPurchaserInc.Member"/>
    <link:presentationArc order="103" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_AiroPurchaserInc.Member_019e2207-0b5f-71b8-afe0-0a760320ed27" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_AmericanHealthStaffingGroupIncMember_019e2207-0b5f-7d71-b4b1-24e9d611ab54" xlink:href="main-20260630.xsd#main_AmericanHealthStaffingGroupIncMember"/>
    <link:presentationArc order="104" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_AmericanHealthStaffingGroupIncMember_019e2207-0b5f-7d71-b4b1-24e9d611ab54" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_ArborWorksLLCMember_019e2207-0b5f-737d-bd52-b978f34d3540" xlink:href="main-20260630.xsd#main_ArborWorksLLCMember"/>
    <link:presentationArc order="105" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_ArborWorksLLCMember_019e2207-0b5f-737d-bd52-b978f34d3540" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_ATSOperatingLLCMember_019e2207-0b5f-7889-8c93-1c3f589aa464" xlink:href="main-20260630.xsd#main_ATSOperatingLLCMember"/>
    <link:presentationArc order="106" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_ATSOperatingLLCMember_019e2207-0b5f-7889-8c93-1c3f589aa464" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_AuriaSpaceLLCMember_019e2207-0b5f-79d0-9c1b-d8666fb2dab1" xlink:href="main-20260630.xsd#main_AuriaSpaceLLCMember"/>
    <link:presentationArc order="107" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_AuriaSpaceLLCMember_019e2207-0b5f-79d0-9c1b-d8666fb2dab1" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_AVEXAviationHoldingsLLCMember_019e2207-0b5f-76e5-883a-77a32eafa633" xlink:href="main-20260630.xsd#main_AVEXAviationHoldingsLLCMember"/>
    <link:presentationArc order="108" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_AVEXAviationHoldingsLLCMember_019e2207-0b5f-76e5-883a-77a32eafa633" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_BehaviorDevelopmentGroupHoldingsMember_019e2207-0b5f-74db-8d98-b334dda14ca3" xlink:href="main-20260630.xsd#main_BehaviorDevelopmentGroupHoldingsMember"/>
    <link:presentationArc order="109" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_BehaviorDevelopmentGroupHoldingsMember_019e2207-0b5f-74db-8d98-b334dda14ca3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_BerryAviationIncMember_019e2207-0b5f-7567-9db2-abc3d2238589" xlink:href="main-20260630.xsd#main_BerryAviationIncMember"/>
    <link:presentationArc order="110" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_BerryAviationIncMember_019e2207-0b5f-7567-9db2-abc3d2238589" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_BluestemBrandsIncMember_019e2207-0b5f-7543-8e20-3ca843af457f" xlink:href="main-20260630.xsd#main_BluestemBrandsIncMember"/>
    <link:presentationArc order="111" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_BluestemBrandsIncMember_019e2207-0b5f-7543-8e20-3ca843af457f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_BOFCorporationMember_019e2207-0b5f-7721-a463-86a689a78d45" xlink:href="main-20260630.xsd#main_BOFCorporationMember"/>
    <link:presentationArc order="112" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_BOFCorporationMember_019e2207-0b5f-7721-a463-86a689a78d45" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_BondBrandLoyaltyULCMember_019e2207-0b5f-719a-8ad5-c6b7eb048a8e" xlink:href="main-20260630.xsd#main_BondBrandLoyaltyULCMember"/>
    <link:presentationArc order="113" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_BondBrandLoyaltyULCMember_019e2207-0b5f-719a-8ad5-c6b7eb048a8e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_BPLoenbroHoldingsInc.Member_019e2207-0b5f-7bb1-b826-a9861a336b1d" xlink:href="main-20260630.xsd#main_BPLoenbroHoldingsInc.Member"/>
    <link:presentationArc order="114" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_BPLoenbroHoldingsInc.Member_019e2207-0b5f-7bb1-b826-a9861a336b1d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_BrainworksSoftwareLLCMember_019e2207-0b5f-7617-928b-9e8dea91f4cc" xlink:href="main-20260630.xsd#main_BrainworksSoftwareLLCMember"/>
    <link:presentationArc order="115" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_BrainworksSoftwareLLCMember_019e2207-0b5f-7617-928b-9e8dea91f4cc" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_BrightwoodCapitalFundInvestmentsMember_019e2207-0b5f-70d7-895f-ab7665bb5487" xlink:href="main-20260630.xsd#main_BrightwoodCapitalFundInvestmentsMember"/>
    <link:presentationArc order="116" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_BrightwoodCapitalFundInvestmentsMember_019e2207-0b5f-70d7-895f-ab7665bb5487" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_ChannelPartnersIntermediatecoLLCMember_019e2207-0b5f-72aa-8a57-dba13988db1e" xlink:href="main-20260630.xsd#main_ChannelPartnersIntermediatecoLLCMember"/>
    <link:presentationArc order="117" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_ChannelPartnersIntermediatecoLLCMember_019e2207-0b5f-72aa-8a57-dba13988db1e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_ComputerDataSourceLLCMember_019e2207-0b5f-79bb-891a-20f96fb2eb38" xlink:href="main-20260630.xsd#main_ComputerDataSourceLLCMember"/>
    <link:presentationArc order="118" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_ComputerDataSourceLLCMember_019e2207-0b5f-79bb-891a-20f96fb2eb38" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_CoreTransformersMember_019e2207-0b5f-7ff6-b26c-aad2d28f6f81" xlink:href="main-20260630.xsd#main_CoreTransformersMember"/>
    <link:presentationArc order="119" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_CoreTransformersMember_019e2207-0b5f-7ff6-b26c-aad2d28f6f81" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_CoregisticsBuyerLLCMember_019e2207-0b5f-7b96-80f9-6e7a078ce76d" xlink:href="main-20260630.xsd#main_CoregisticsBuyerLLCMember"/>
    <link:presentationArc order="120" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_CoregisticsBuyerLLCMember_019e2207-0b5f-7b96-80f9-6e7a078ce76d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_CoreStackInc.Member_019e2207-0b5f-7808-8714-180dc0a3bd4c" xlink:href="main-20260630.xsd#main_CoreStackInc.Member"/>
    <link:presentationArc order="121" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_CoreStackInc.Member_019e2207-0b5f-7808-8714-180dc0a3bd4c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_CQFluencyLLCMember_019e2207-0b5f-7ac3-922d-6c178391ffae" xlink:href="main-20260630.xsd#main_CQFluencyLLCMember"/>
    <link:presentationArc order="122" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_CQFluencyLLCMember_019e2207-0b5f-7ac3-922d-6c178391ffae" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_CRCEvansUSABidcoInc.Member_019e2207-0b5f-7253-9445-1913fa2d796c" xlink:href="main-20260630.xsd#main_CRCEvansUSABidcoInc.Member"/>
    <link:presentationArc order="123" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_CRCEvansUSABidcoInc.Member_019e2207-0b5f-7253-9445-1913fa2d796c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_CreativeFoamCorporationMember_019e2207-0b5f-7e72-b942-4393f2e98d30" xlink:href="main-20260630.xsd#main_CreativeFoamCorporationMember"/>
    <link:presentationArc order="124" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_CreativeFoamCorporationMember_019e2207-0b5f-7e72-b942-4393f2e98d30" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_DTEEnterprisesLLCMember_019e2207-0b5f-7ef5-af69-67bc82f463e3" xlink:href="main-20260630.xsd#main_DTEEnterprisesLLCMember"/>
    <link:presentationArc order="125" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_DTEEnterprisesLLCMember_019e2207-0b5f-7ef5-af69-67bc82f463e3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_DynamicCommunitiesLLCMember_019e2207-0b5f-75df-aa7d-b9ccc89f06a6" xlink:href="main-20260630.xsd#main_DynamicCommunitiesLLCMember"/>
    <link:presentationArc order="126" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_DynamicCommunitiesLLCMember_019e2207-0b5f-75df-aa7d-b9ccc89f06a6" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_ElectroTechnicalIndustriesLLCMember_019e2207-0b5f-79a8-a3b8-62770d733011" xlink:href="main-20260630.xsd#main_ElectroTechnicalIndustriesLLCMember"/>
    <link:presentationArc order="127" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_ElectroTechnicalIndustriesLLCMember_019e2207-0b5f-79a8-a3b8-62770d733011" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_EnCapEnergyFundInvestmentsMember_019e2207-0b5f-7f35-86b4-1dd52fb51a67" xlink:href="main-20260630.xsd#main_EnCapEnergyFundInvestmentsMember"/>
    <link:presentationArc order="128" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_EnCapEnergyFundInvestmentsMember_019e2207-0b5f-7f35-86b4-1dd52fb51a67" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_EscalentIncMember_019e2207-0b5f-774d-bb73-3d11f0b0fdfd" xlink:href="main-20260630.xsd#main_EscalentIncMember"/>
    <link:presentationArc order="129" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_EscalentIncMember_019e2207-0b5f-774d-bb73-3d11f0b0fdfd" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_EventHoldcoLLCMember_019e2207-0b5f-742d-a8ac-f95261e1a590" xlink:href="main-20260630.xsd#main_EventHoldcoLLCMember"/>
    <link:presentationArc order="130" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_EventHoldcoLLCMember_019e2207-0b5f-742d-a8ac-f95261e1a590" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_FuseLLCMember_019e2207-0b5f-7676-85f2-64c59c4f73b0" xlink:href="main-20260630.xsd#main_FuseLLCMember"/>
    <link:presentationArc order="131" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_FuseLLCMember_019e2207-0b5f-7676-85f2-64c59c4f73b0" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_GarylineLLCMember_019e2207-0b5f-7a9f-b74d-dbc52a0958f2" xlink:href="main-20260630.xsd#main_GarylineLLCMember"/>
    <link:presentationArc order="132" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_GarylineLLCMember_019e2207-0b5f-7a9f-b74d-dbc52a0958f2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_GradeEightCorp.Member_019e2207-0b5f-780d-9edb-7c8c161c6c00" xlink:href="main-20260630.xsd#main_GradeEightCorp.Member"/>
    <link:presentationArc order="133" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_GradeEightCorp.Member_019e2207-0b5f-780d-9edb-7c8c161c6c00" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_GSHVAMIntermediateLLCMember_019e2207-0b5f-79d1-8cb0-4fd174e58a05" xlink:href="main-20260630.xsd#main_GSHVAMIntermediateLLCMember"/>
    <link:presentationArc order="134" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_GSHVAMIntermediateLLCMember_019e2207-0b5f-79d1-8cb0-4fd174e58a05" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_GULFPACIFICACQUISITIONLLCMember_019e2207-0b5f-7dac-b369-7bb2df4a548c" xlink:href="main-20260630.xsd#main_GULFPACIFICACQUISITIONLLCMember"/>
    <link:presentationArc order="135" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_GULFPACIFICACQUISITIONLLCMember_019e2207-0b5f-7dac-b369-7bb2df4a548c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_HarrisPrestonFundInvestmentsTwoMember_019e2207-0b5f-793e-b1ca-1a8f05dbcd87" xlink:href="main-20260630.xsd#main_HarrisPrestonFundInvestmentsTwoMember"/>
    <link:presentationArc order="136" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_HarrisPrestonFundInvestmentsTwoMember_019e2207-0b5f-793e-b1ca-1a8f05dbcd87" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_HDCHWIntermediateHoldingsMember_019e2207-0b5f-7147-8daa-296b2d40f549" xlink:href="main-20260630.xsd#main_HDCHWIntermediateHoldingsMember"/>
    <link:presentationArc order="137" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_HDCHWIntermediateHoldingsMember_019e2207-0b5f-7147-8daa-296b2d40f549" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_HornblowerSubLLCMember_019e2207-0b5f-73b3-9686-07c91dcae7bc" xlink:href="main-20260630.xsd#main_HornblowerSubLLCMember"/>
    <link:presentationArc order="138" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_HornblowerSubLLCMember_019e2207-0b5f-73b3-9686-07c91dcae7bc" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_HorwitzHoldingsLLCMember_019fa34f-91a3-73bb-b44e-741e97f6b3fc" xlink:href="main-20260630.xsd#main_HorwitzHoldingsLLCMember"/>
    <link:presentationArc order="139" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_HorwitzHoldingsLLCMember_019fa34f-91a3-73bb-b44e-741e97f6b3fc" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_IGParentCorporationMember_019e2207-0b5f-764a-b408-0ab32917a81b" xlink:href="main-20260630.xsd#main_IGParentCorporationMember"/>
    <link:presentationArc order="140" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_IGParentCorporationMember_019e2207-0b5f-764a-b408-0ab32917a81b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_IgniteVisibilityLLCMember_019e2207-0b5f-7fd3-9711-23215dc3f947" xlink:href="main-20260630.xsd#main_IgniteVisibilityLLCMember"/>
    <link:presentationArc order="141" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_IgniteVisibilityLLCMember_019e2207-0b5f-7fd3-9711-23215dc3f947" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_ImplusFootcareLLCMember_019e2207-0b5f-7884-84ff-a04561a76ea1" xlink:href="main-20260630.xsd#main_ImplusFootcareLLCMember"/>
    <link:presentationArc order="142" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_ImplusFootcareLLCMember_019e2207-0b5f-7884-84ff-a04561a76ea1" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_InsightBorrowerCorporationMember_019e2207-0b5f-723b-a7e0-ef41703e5a38" xlink:href="main-20260630.xsd#main_InsightBorrowerCorporationMember"/>
    <link:presentationArc order="143" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_InsightBorrowerCorporationMember_019e2207-0b5f-723b-a7e0-ef41703e5a38" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_InspireAestheticsManagementLLCMember_019e2207-0b5f-7a47-a3bf-67f787359b61" xlink:href="main-20260630.xsd#main_InspireAestheticsManagementLLCMember"/>
    <link:presentationArc order="144" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_InspireAestheticsManagementLLCMember_019e2207-0b5f-7a47-a3bf-67f787359b61" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_InterfaceSecuritySystemsLLCMember_019e2207-0b5f-769b-8d07-aa895391b8d9" xlink:href="main-20260630.xsd#main_InterfaceSecuritySystemsLLCMember"/>
    <link:presentationArc order="145" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_InterfaceSecuritySystemsLLCMember_019e2207-0b5f-769b-8d07-aa895391b8d9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_InvincibleBoatCompanyLLCMember_019e2207-0b5f-7bdd-bb66-5368cdabd5d4" xlink:href="main-20260630.xsd#main_InvincibleBoatCompanyLLCMember"/>
    <link:presentationArc order="146" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_InvincibleBoatCompanyLLCMember_019e2207-0b5f-7bdd-bb66-5368cdabd5d4" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_IsagenixInternationalLLCMember_019e2207-0b5f-7afc-bb55-f8fb4435e694" xlink:href="main-20260630.xsd#main_IsagenixInternationalLLCMember"/>
    <link:presentationArc order="147" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_IsagenixInternationalLLCMember_019e2207-0b5f-7afc-bb55-f8fb4435e694" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_IslandPumpAndTankLLCMember_019e2207-0b5f-75c6-95ba-38c89bc1c9db" xlink:href="main-20260630.xsd#main_IslandPumpAndTankLLCMember"/>
    <link:presentationArc order="148" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_IslandPumpAndTankLLCMember_019e2207-0b5f-75c6-95ba-38c89bc1c9db" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_JackmontHospitalityIncMember_019e2207-0b5f-703d-9630-631718c65e91" xlink:href="main-20260630.xsd#main_JackmontHospitalityIncMember"/>
    <link:presentationArc order="149" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_JackmontHospitalityIncMember_019e2207-0b5f-703d-9630-631718c65e91" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_JoernsHealthcareLLCMember_019e2207-0b5f-7bb9-af47-74c06018abba" xlink:href="main-20260630.xsd#main_JoernsHealthcareLLCMember"/>
    <link:presentationArc order="150" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_JoernsHealthcareLLCMember_019e2207-0b5f-7bb9-af47-74c06018abba" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_LKCMHeadwaterInvestmentsMember_019e2207-0b5f-743c-9ebe-9a92358bc239" xlink:href="main-20260630.xsd#main_LKCMHeadwaterInvestmentsMember"/>
    <link:presentationArc order="151" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_LKCMHeadwaterInvestmentsMember_019e2207-0b5f-743c-9ebe-9a92358bc239" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_LogixAcquisitionCompanyLLCMember_019e2207-0b5f-76aa-9eb0-d105dbbbb3ca" xlink:href="main-20260630.xsd#main_LogixAcquisitionCompanyLLCMember"/>
    <link:presentationArc order="152" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_LogixAcquisitionCompanyLLCMember_019e2207-0b5f-76aa-9eb0-d105dbbbb3ca" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_MCTPurchasercoHoldingInc.Member_019e2207-0b5f-76f8-b3e4-3bd0529922d4" xlink:href="main-20260630.xsd#main_MCTPurchasercoHoldingInc.Member"/>
    <link:presentationArc order="153" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_MCTPurchasercoHoldingInc.Member_019e2207-0b5f-76f8-b3e4-3bd0529922d4" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_MicrobeFormulasLLCMember_019e2207-0b5f-70ee-b69b-f70f2a7afc12" xlink:href="main-20260630.xsd#main_MicrobeFormulasLLCMember"/>
    <link:presentationArc order="154" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_MicrobeFormulasLLCMember_019e2207-0b5f-70ee-b69b-f70f2a7afc12" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_MiniMeltsOfAmericaLLCMember_019e2207-0b5f-77cf-a4ff-e83b59edf93c" xlink:href="main-20260630.xsd#main_MiniMeltsOfAmericaLLCMember"/>
    <link:presentationArc order="155" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_MiniMeltsOfAmericaLLCMember_019e2207-0b5f-77cf-a4ff-e83b59edf93c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_MissionCriticalGroupMember_019e2207-0b5f-7ca0-b436-ad500a5a4bec" xlink:href="main-20260630.xsd#main_MissionCriticalGroupMember"/>
    <link:presentationArc order="156" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_MissionCriticalGroupMember_019e2207-0b5f-7ca0-b436-ad500a5a4bec" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_MonitorUSHoldingLLCMember_019e2207-0b5f-7c27-a4d4-4d37d9f27291" xlink:href="main-20260630.xsd#main_MonitorUSHoldingLLCMember"/>
    <link:presentationArc order="157" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_MonitorUSHoldingLLCMember_019e2207-0b5f-7c27-a4d4-4d37d9f27291" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_ObraCapitalInc.Member_019e2207-0b5f-7244-83f6-9f3cae09f769" xlink:href="main-20260630.xsd#main_ObraCapitalInc.Member"/>
    <link:presentationArc order="158" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_ObraCapitalInc.Member_019e2207-0b5f-7244-83f6-9f3cae09f769" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_OnPointIndustrialServicesLLCMember_019e2207-0b5f-713e-85f6-edcec75c5daa" xlink:href="main-20260630.xsd#main_OnPointIndustrialServicesLLCMember"/>
    <link:presentationArc order="159" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_OnPointIndustrialServicesLLCMember_019e2207-0b5f-713e-85f6-edcec75c5daa" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_PavConLLCMember_019e2207-0b5f-72d3-905b-87196939f899" xlink:href="main-20260630.xsd#main_PavConLLCMember"/>
    <link:presentationArc order="160" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_PavConLLCMember_019e2207-0b5f-72d3-905b-87196939f899" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_PrimeFlightAviationServicesMember_019e2207-0b5f-7d53-8206-9d3efed0e69f" xlink:href="main-20260630.xsd#main_PrimeFlightAviationServicesMember"/>
    <link:presentationArc order="161" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_PrimeFlightAviationServicesMember_019e2207-0b5f-7d53-8206-9d3efed0e69f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_ProMaxRestorationPaintLLCMember_019faf94-a089-779e-85ed-7894d3c525ce" xlink:href="main-20260630.xsd#main_ProMaxRestorationPaintLLCMember"/>
    <link:presentationArc order="162" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_ProMaxRestorationPaintLLCMember_019faf94-a089-779e-85ed-7894d3c525ce" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_RichardsonSalesSolutionsMember_019e2207-0b5f-7da4-8b82-6cf693196fb9" xlink:href="main-20260630.xsd#main_RichardsonSalesSolutionsMember"/>
    <link:presentationArc order="163" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_RichardsonSalesSolutionsMember_019e2207-0b5f-7da4-8b82-6cf693196fb9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_RoofOpcoLLCMember_019e2207-0b5f-78e9-af49-debac7dab045" xlink:href="main-20260630.xsd#main_RoofOpcoLLCMember"/>
    <link:presentationArc order="164" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_RoofOpcoLLCMember_019e2207-0b5f-78e9-af49-debac7dab045" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_RoyalCupInc.Member_019e2207-0b5f-7bbf-9c21-d0eb4dc4c124" xlink:href="main-20260630.xsd#main_RoyalCupInc.Member"/>
    <link:presentationArc order="165" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_RoyalCupInc.Member_019e2207-0b5f-7bbf-9c21-d0eb4dc4c124" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_RugDoctorLLCMember_019e2207-0b5f-7492-87be-428109456f26" xlink:href="main-20260630.xsd#main_RugDoctorLLCMember"/>
    <link:presentationArc order="166" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_RugDoctorLLCMember_019e2207-0b5f-7492-87be-428109456f26" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_SouthCoastTerminalsHoldingsLLCMember_019e2207-0b5f-774d-8cae-c8ed65d2a237" xlink:href="main-20260630.xsd#main_SouthCoastTerminalsHoldingsLLCMember"/>
    <link:presentationArc order="167" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_SouthCoastTerminalsHoldingsLLCMember_019e2207-0b5f-774d-8cae-c8ed65d2a237" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_SPAUHoldingsLLCMember_019e2207-0b5f-7022-a7ac-60772495bafc" xlink:href="main-20260630.xsd#main_SPAUHoldingsLLCMember"/>
    <link:presentationArc order="168" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_SPAUHoldingsLLCMember_019e2207-0b5f-7022-a7ac-60772495bafc" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_TECServicesLLCMember_019e2207-0b5f-7960-904b-81a1cd641f18" xlink:href="main-20260630.xsd#main_TECServicesLLCMember"/>
    <link:presentationArc order="169" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_TECServicesLLCMember_019e2207-0b5f-7960-904b-81a1cd641f18" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_TitanMeterMidcoCorp.Member_019e2207-0b5f-7049-89da-a3dba08910c4" xlink:href="main-20260630.xsd#main_TitanMeterMidcoCorp.Member"/>
    <link:presentationArc order="170" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_TitanMeterMidcoCorp.Member_019e2207-0b5f-7049-89da-a3dba08910c4" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_USTelePacificCorpMember_019e2207-0b5f-76a5-9271-05438ff9d4de" xlink:href="main-20260630.xsd#main_USTelePacificCorpMember"/>
    <link:presentationArc order="171" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_USTelePacificCorpMember_019e2207-0b5f-76a5-9271-05438ff9d4de" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_UBMAcquireCoLLCMember_019e2207-0b5f-7261-aee1-304ffb4736dc" xlink:href="main-20260630.xsd#main_UBMAcquireCoLLCMember"/>
    <link:presentationArc order="172" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_UBMAcquireCoLLCMember_019e2207-0b5f-7261-aee1-304ffb4736dc" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_UPSIntermediateLLCMember_019e2207-0b5f-75a2-b9f2-749507a64c12" xlink:href="main-20260630.xsd#main_UPSIntermediateLLCMember"/>
    <link:presentationArc order="173" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_UPSIntermediateLLCMember_019e2207-0b5f-75a2-b9f2-749507a64c12" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_UserZoomTechnologiesInc.Member_019e2207-0b5f-7a79-8014-a8c88d1b74a8" xlink:href="main-20260630.xsd#main_UserZoomTechnologiesInc.Member"/>
    <link:presentationArc order="174" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_UserZoomTechnologiesInc.Member_019e2207-0b5f-7a79-8014-a8c88d1b74a8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_VitesseSystemsMember_019e2207-0b5f-7fd3-8df8-835e41285c59" xlink:href="main-20260630.xsd#main_VitesseSystemsMember"/>
    <link:presentationArc order="175" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_VitesseSystemsMember_019e2207-0b5f-7fd3-8df8-835e41285c59" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_WashWaxSystemsLLCMember_019e2207-0b5f-7448-bdad-186b5fb70413" xlink:href="main-20260630.xsd#main_WashWaxSystemsLLCMember"/>
    <link:presentationArc order="176" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_WashWaxSystemsLLCMember_019e2207-0b5f-7448-bdad-186b5fb70413" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_WattersonBrandsLLCMember_019e2207-0b5f-7c6c-825a-df0085b325ef" xlink:href="main-20260630.xsd#main_WattersonBrandsLLCMember"/>
    <link:presentationArc order="177" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_WattersonBrandsLLCMember_019e2207-0b5f-7c6c-825a-df0085b325ef" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_WinterServicesLLCMember_019e2207-0b5f-7d9a-aa0f-0ce6f7132f3e" xlink:href="main-20260630.xsd#main_WinterServicesLLCMember"/>
    <link:presentationArc order="178" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_WinterServicesLLCMember_019e2207-0b5f-7d9a-aa0f-0ce6f7132f3e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_XenonArcIncMember_019e2207-0b5f-79c0-90e9-f9fe7d9dc28a" xlink:href="main-20260630.xsd#main_XenonArcIncMember"/>
    <link:presentationArc order="179" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_XenonArcIncMember_019e2207-0b5f-79c0-90e9-f9fe7d9dc28a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_ZRGPartnersLLCMember_019e2207-0b5f-7c98-9de8-7f2469dc832d" xlink:href="main-20260630.xsd#main_ZRGPartnersLLCMember"/>
    <link:presentationArc order="180" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0a8b-7d48-a782-1d670135c1da" xlink:to="loc_main_ZRGPartnersLLCMember_019e2207-0b5f-7c98-9de8-7f2469dc832d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentIssuerAffiliationAxis_019e2207-0b5f-7224-8b40-2668755ee21d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentIssuerAffiliationAxis"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfInvestmentsTable_019e2207-0a8b-7ee6-aae4-d8342fe763c3" xlink:to="loc_us-gaap_InvestmentIssuerAffiliationAxis_019e2207-0b5f-7224-8b40-2668755ee21d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentIssuerAffiliationDomain_019e2207-0b5f-70be-94cf-3e34711abc52" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentIssuerAffiliationDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerAffiliationAxis_019e2207-0b5f-7224-8b40-2668755ee21d" xlink:to="loc_us-gaap_InvestmentIssuerAffiliationDomain_019e2207-0b5f-70be-94cf-3e34711abc52" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentAffiliatedIssuerControlledMember_019e2207-0b5f-779a-b517-9736c8eaf9ba" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentAffiliatedIssuerControlledMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerAffiliationDomain_019e2207-0b5f-70be-94cf-3e34711abc52" xlink:to="loc_us-gaap_InvestmentAffiliatedIssuerControlledMember_019e2207-0b5f-779a-b517-9736c8eaf9ba" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentAffiliatedIssuerNoncontrolledMember_019e2207-0b5f-7624-af4c-599d7ea9a326" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentAffiliatedIssuerNoncontrolledMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerAffiliationDomain_019e2207-0b5f-70be-94cf-3e34711abc52" xlink:to="loc_us-gaap_InvestmentAffiliatedIssuerNoncontrolledMember_019e2207-0b5f-7624-af4c-599d7ea9a326" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentUnaffiliatedIssuerMember_019e2207-0b5f-7f7f-af18-762dce551ccd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentUnaffiliatedIssuerMember"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerAffiliationDomain_019e2207-0b5f-70be-94cf-3e34711abc52" xlink:to="loc_us-gaap_InvestmentUnaffiliatedIssuerMember_019e2207-0b5f-7f7f-af18-762dce551ccd" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAxis_019e2207-0b5f-726b-be5e-2700031a722f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashAndCashEquivalentsAxis"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfInvestmentsTable_019e2207-0a8b-7ee6-aae4-d8342fe763c3" xlink:to="loc_us-gaap_CashAndCashEquivalentsAxis_019e2207-0b5f-726b-be5e-2700031a722f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_019e2207-0b5f-7829-a642-21829e6ffeb7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CashAndCashEquivalentsAxis_019e2207-0b5f-726b-be5e-2700031a722f" xlink:to="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_019e2207-0b5f-7829-a642-21829e6ffeb7" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MoneyMarketFundsMember_019e2207-0b5f-7870-a4b4-779d24472263" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MoneyMarketFundsMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_019e2207-0b5f-7829-a642-21829e6ffeb7" xlink:to="loc_us-gaap_MoneyMarketFundsMember_019e2207-0b5f-7870-a4b4-779d24472263" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfInvestmentsLineItems_019e2207-0b5f-7e7a-a306-44e63337661b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfInvestmentsLineItems"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfInvestmentsTable_019e2207-0a8b-7ee6-aae4-d8342fe763c3" xlink:to="loc_us-gaap_ScheduleOfInvestmentsLineItems_019e2207-0b5f-7e7a-a306-44e63337661b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentOwnedBalanceShares_019e2207-0b5f-7ab1-b451-3908aa6a405f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentOwnedBalanceShares"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019e2207-0b5f-7e7a-a306-44e63337661b" xlink:to="loc_us-gaap_InvestmentOwnedBalanceShares_019e2207-0b5f-7ab1-b451-3908aa6a405f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_InvestmentOwnedBalancePercentOfShares_019e2207-0b5f-7dd0-adf1-ce7ca2e3625a" xlink:href="main-20260630.xsd#main_InvestmentOwnedBalancePercentOfShares"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019e2207-0b5f-7e7a-a306-44e63337661b" xlink:to="loc_main_InvestmentOwnedBalancePercentOfShares_019e2207-0b5f-7dd0-adf1-ce7ca2e3625a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentInterestRate_019e2207-0b5f-7125-8da3-6aa2d0334e5c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentInterestRate"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019e2207-0b5f-7e7a-a306-44e63337661b" xlink:to="loc_us-gaap_InvestmentInterestRate_019e2207-0b5f-7125-8da3-6aa2d0334e5c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentBasisSpreadVariableRate_019e2207-0b5f-7a86-8571-9f8c4cb379a5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentBasisSpreadVariableRate"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019e2207-0b5f-7e7a-a306-44e63337661b" xlink:to="loc_us-gaap_InvestmentBasisSpreadVariableRate_019e2207-0b5f-7a86-8571-9f8c4cb379a5" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentInterestRatePaidInKind_019e2207-0b5f-7208-bb75-9adbd689a43f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentInterestRatePaidInKind"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019e2207-0b5f-7e7a-a306-44e63337661b" xlink:to="loc_us-gaap_InvestmentInterestRatePaidInKind_019e2207-0b5f-7208-bb75-9adbd689a43f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentOwnedBalancePrincipalAmount_019e2207-0b5f-7c0d-bc3b-deb4bc5dcb27" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentOwnedBalancePrincipalAmount"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019e2207-0b5f-7e7a-a306-44e63337661b" xlink:to="loc_us-gaap_InvestmentOwnedBalancePrincipalAmount_019e2207-0b5f-7c0d-bc3b-deb4bc5dcb27" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentOwnedAtCost_019e2207-0b5f-7726-b21c-4fe6832a8f04" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentOwnedAtCost"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019e2207-0b5f-7e7a-a306-44e63337661b" xlink:to="loc_us-gaap_InvestmentOwnedAtCost_019e2207-0b5f-7726-b21c-4fe6832a8f04" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentOwnedAtFairValue_019e2207-0b5f-7e2a-9f0b-79cbbe7e6db2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentOwnedAtFairValue"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019e2207-0b5f-7e7a-a306-44e63337661b" xlink:to="loc_us-gaap_InvestmentOwnedAtFairValue_019e2207-0b5f-7e2a-9f0b-79cbbe7e6db2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentOwnedPercentOfNetAssets_019e2207-0b5f-710d-af5c-29f6f71f3ff3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentOwnedPercentOfNetAssets"/>
    <link:presentationArc order="9" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019e2207-0b5f-7e7a-a306-44e63337661b" xlink:to="loc_us-gaap_InvestmentOwnedPercentOfNetAssets_019e2207-0b5f-710d-af5c-29f6f71f3ff3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_019e2207-0b5f-7537-aff3-f4e3efa05570" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:presentationArc order="10" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019e2207-0b5f-7e7a-a306-44e63337661b" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_019e2207-0b5f-7537-aff3-f4e3efa05570" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/netLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_019e2207-0b5f-7eae-a4e9-e6a7abea16ec" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashAndCashEquivalentsFairValueDisclosure"/>
    <link:presentationArc order="11" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019e2207-0b5f-7e7a-a306-44e63337661b" xlink:to="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_019e2207-0b5f-7eae-a4e9-e6a7abea16ec" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.mainstcapital.com/role/ConsolidatedScheduleofInvestmentsParenthetical" xlink:type="simple" xlink:href="main-20260630.xsd#ConsolidatedScheduleofInvestmentsParenthetical"/>
  <link:presentationLink xlink:role="http://www.mainstcapital.com/role/ConsolidatedScheduleofInvestmentsParenthetical" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfInvestmentsAbstract_019e2207-0b5f-7723-8e9f-09d5f98883a9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfInvestmentsAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfInvestmentsTable_019e2207-0b5f-75ea-a7eb-2b340c0e91b2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfInvestmentsTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfInvestmentsAbstract_019e2207-0b5f-7723-8e9f-09d5f98883a9" xlink:to="loc_us-gaap_ScheduleOfInvestmentsTable_019e2207-0b5f-75ea-a7eb-2b340c0e91b2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019e2207-0b5f-7f23-81b6-8a94bc3455f0" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfInvestmentsTable_019e2207-0b5f-75ea-a7eb-2b340c0e91b2" xlink:to="loc_srt_RangeAxis_019e2207-0b5f-7f23-81b6-8a94bc3455f0" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019e2207-0b5f-7baf-a039-b57ee6b5f22e" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeAxis_019e2207-0b5f-7f23-81b6-8a94bc3455f0" xlink:to="loc_srt_RangeMember_019e2207-0b5f-7baf-a039-b57ee6b5f22e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019e2207-0b5f-7d17-953f-6f144c62647c" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MinimumMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeMember_019e2207-0b5f-7baf-a039-b57ee6b5f22e" xlink:to="loc_srt_MinimumMember_019e2207-0b5f-7d17-953f-6f144c62647c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019e2207-0b5f-7be5-a8cf-1e325b11f9c6" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MaximumMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeMember_019e2207-0b5f-7baf-a039-b57ee6b5f22e" xlink:to="loc_srt_MaximumMember_019e2207-0b5f-7be5-a8cf-1e325b11f9c6" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_WeightedAverageMember_019e2207-0b5f-7807-b1ac-80e0ef08510b" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_WeightedAverageMember"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeMember_019e2207-0b5f-7baf-a039-b57ee6b5f22e" xlink:to="loc_srt_WeightedAverageMember_019e2207-0b5f-7807-b1ac-80e0ef08510b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateAxis_019e2207-0b5f-7f61-9349-fc6a62115f3b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_VariableRateAxis"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfInvestmentsTable_019e2207-0b5f-75ea-a7eb-2b340c0e91b2" xlink:to="loc_us-gaap_VariableRateAxis_019e2207-0b5f-7f61-9349-fc6a62115f3b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_019e2207-0b5f-7b5c-b381-12ea4ed8cd06" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_VariableRateDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_VariableRateAxis_019e2207-0b5f-7f61-9349-fc6a62115f3b" xlink:to="loc_us-gaap_VariableRateDomain_019e2207-0b5f-7b5c-b381-12ea4ed8cd06" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredOvernightFinancingRateSofrMember_019e2207-0b5f-7cad-a3ea-da0321801aef" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SecuredOvernightFinancingRateSofrMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_VariableRateDomain_019e2207-0b5f-7b5c-b381-12ea4ed8cd06" xlink:to="loc_us-gaap_SecuredOvernightFinancingRateSofrMember_019e2207-0b5f-7cad-a3ea-da0321801aef" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_SOFRAdjustmentSpreadMember_019e2207-0b5f-7542-ae89-937ccdebb914" xlink:href="main-20260630.xsd#main_SOFRAdjustmentSpreadMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_VariableRateDomain_019e2207-0b5f-7b5c-b381-12ea4ed8cd06" xlink:to="loc_main_SOFRAdjustmentSpreadMember_019e2207-0b5f-7542-ae89-937ccdebb914" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentIdentifierAxis_019e2207-0b5f-7c78-a6f0-ee7fde4c8d4d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentIdentifierAxis"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfInvestmentsTable_019e2207-0b5f-75ea-a7eb-2b340c0e91b2" xlink:to="loc_us-gaap_InvestmentIdentifierAxis_019e2207-0b5f-7c78-a6f0-ee7fde4c8d4d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfInvestmentsLineItems_019e2207-0b5f-71f8-819b-4af306aaa98e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfInvestmentsLineItems"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfInvestmentsTable_019e2207-0b5f-75ea-a7eb-2b340c0e91b2" xlink:to="loc_us-gaap_ScheduleOfInvestmentsLineItems_019e2207-0b5f-71f8-819b-4af306aaa98e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_InvestmentCompanyPercentageOfLoansWithVariableRateFloors_019e2207-0b5f-7af6-8bb3-edd632b6c6f7" xlink:href="main-20260630.xsd#main_InvestmentCompanyPercentageOfLoansWithVariableRateFloors"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019e2207-0b5f-71f8-819b-4af306aaa98e" xlink:to="loc_main_InvestmentCompanyPercentageOfLoansWithVariableRateFloors_019e2207-0b5f-7af6-8bb3-edd632b6c6f7" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentBasisSpreadVariableRate_019e2207-0b5f-7bcf-8b77-2d3dd427b05b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentBasisSpreadVariableRate"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019e2207-0b5f-71f8-819b-4af306aaa98e" xlink:to="loc_us-gaap_InvestmentBasisSpreadVariableRate_019e2207-0b5f-7bcf-8b77-2d3dd427b05b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentInterestRateFloor_019e2207-0b5f-7583-b641-1f1d9d846450" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentInterestRateFloor"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019e2207-0b5f-71f8-819b-4af306aaa98e" xlink:to="loc_us-gaap_InvestmentInterestRateFloor_019e2207-0b5f-7583-b641-1f1d9d846450" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_InvestmentInterestRateStated_019e2207-0b5f-7c00-b688-6a766e37a906" xlink:href="main-20260630.xsd#main_InvestmentInterestRateStated"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019e2207-0b5f-71f8-819b-4af306aaa98e" xlink:to="loc_main_InvestmentInterestRateStated_019e2207-0b5f-7c00-b688-6a766e37a906" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OptionIndexedToIssuersEquityStrikePrice1_019e2207-0b5f-7bdc-b061-5b023ce2ee3d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OptionIndexedToIssuersEquityStrikePrice1"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019e2207-0b5f-71f8-819b-4af306aaa98e" xlink:to="loc_us-gaap_OptionIndexedToIssuersEquityStrikePrice1_019e2207-0b5f-7bdc-b061-5b023ce2ee3d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentInterestRate_019e2207-0b5f-7b19-9d77-d35e9fb6b481" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentInterestRate"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019e2207-0b5f-71f8-819b-4af306aaa98e" xlink:to="loc_us-gaap_InvestmentInterestRate_019e2207-0b5f-7b19-9d77-d35e9fb6b481" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_InvestmentIndexBasedFloatingInterestRate_019e2207-0b5f-72c2-ac94-130159c05ff9" xlink:href="main-20260630.xsd#main_InvestmentIndexBasedFloatingInterestRate"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019e2207-0b5f-71f8-819b-4af306aaa98e" xlink:to="loc_main_InvestmentIndexBasedFloatingInterestRate_019e2207-0b5f-72c2-ac94-130159c05ff9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_InvestmentAccruingIncomeFixedCashRate_019e2207-0b5f-7a35-b716-56887a7cd316" xlink:href="main-20260630.xsd#main_InvestmentAccruingIncomeFixedCashRate"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019e2207-0b5f-71f8-819b-4af306aaa98e" xlink:to="loc_main_InvestmentAccruingIncomeFixedCashRate_019e2207-0b5f-7a35-b716-56887a7cd316" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.mainstcapital.com/role/ORGANIZATIONANDBASISOFPRESENTATION" xlink:type="simple" xlink:href="main-20260630.xsd#ORGANIZATIONANDBASISOFPRESENTATION"/>
  <link:presentationLink xlink:role="http://www.mainstcapital.com/role/ORGANIZATIONANDBASISOFPRESENTATION" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_019e2207-0b5f-7f2a-8760-ab6ec23b4437" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock_019e2207-0b5f-79d1-aa2b-961267e27814" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_019e2207-0b5f-7f2a-8760-ab6ec23b4437" xlink:to="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock_019e2207-0b5f-79d1-aa2b-961267e27814" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.mainstcapital.com/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIES" xlink:type="simple" xlink:href="main-20260630.xsd#SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIES"/>
  <link:presentationLink xlink:role="http://www.mainstcapital.com/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIES" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountingPoliciesAbstract_019e2207-0b5f-7927-995c-22f8e850cda3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccountingPoliciesAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SignificantAccountingPoliciesTextBlock_019e2207-0b5f-7873-bbd2-20d39b3b1218" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SignificantAccountingPoliciesTextBlock"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_019e2207-0b5f-7927-995c-22f8e850cda3" xlink:to="loc_us-gaap_SignificantAccountingPoliciesTextBlock_019e2207-0b5f-7873-bbd2-20d39b3b1218" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.mainstcapital.com/role/FAIRVALUEHIERARCHYFORINVESTMENTSPORTFOLIOCOMPOSITION" xlink:type="simple" xlink:href="main-20260630.xsd#FAIRVALUEHIERARCHYFORINVESTMENTSPORTFOLIOCOMPOSITION"/>
  <link:presentationLink xlink:role="http://www.mainstcapital.com/role/FAIRVALUEHIERARCHYFORINVESTMENTSPORTFOLIOCOMPOSITION" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueDisclosuresAbstract_019e2207-0b5f-74e4-bf7a-30770cfaf668" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueDisclosuresAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueDisclosuresTextBlock_019e2207-0b5f-720b-8131-2878289d9ba8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueDisclosuresTextBlock"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueDisclosuresAbstract_019e2207-0b5f-74e4-bf7a-30770cfaf668" xlink:to="loc_us-gaap_FairValueDisclosuresTextBlock_019e2207-0b5f-720b-8131-2878289d9ba8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.mainstcapital.com/role/EXTERNALINVESTMENTMANAGER" xlink:type="simple" xlink:href="main-20260630.xsd#EXTERNALINVESTMENTMANAGER"/>
  <link:presentationLink xlink:role="http://www.mainstcapital.com/role/EXTERNALINVESTMENTMANAGER" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentCompanyAbstract_019e2207-0b60-71be-841c-c23f75503d96" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentCompanyAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_ExternalInvestmentManagerTextBlock_019e2207-0b60-78c7-a0d1-3ad58a71f54a" xlink:href="main-20260630.xsd#main_ExternalInvestmentManagerTextBlock"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentCompanyAbstract_019e2207-0b60-71be-841c-c23f75503d96" xlink:to="loc_main_ExternalInvestmentManagerTextBlock_019e2207-0b60-78c7-a0d1-3ad58a71f54a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.mainstcapital.com/role/DEBT" xlink:type="simple" xlink:href="main-20260630.xsd#DEBT"/>
  <link:presentationLink xlink:role="http://www.mainstcapital.com/role/DEBT" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtDisclosureAbstract_019e2207-0b60-7b0b-b43d-3f2730fa727c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtDisclosureAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtDisclosureTextBlock_019e2207-0b60-7911-b95f-5c8483d2439a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtDisclosureTextBlock"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtDisclosureAbstract_019e2207-0b60-7b0b-b43d-3f2730fa727c" xlink:to="loc_us-gaap_DebtDisclosureTextBlock_019e2207-0b60-7911-b95f-5c8483d2439a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.mainstcapital.com/role/FINANCIALHIGHLIGHTS" xlink:type="simple" xlink:href="main-20260630.xsd#FINANCIALHIGHLIGHTS"/>
  <link:presentationLink xlink:role="http://www.mainstcapital.com/role/FINANCIALHIGHLIGHTS" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentCompanyAbstract_019e2207-0b60-73e6-9bdd-c94425b4d242" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentCompanyAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentCompanyFinancialHighlightsTextBlock_019e2207-0b60-78fd-8da9-a0c42d271e15" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentCompanyFinancialHighlightsTextBlock"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentCompanyAbstract_019e2207-0b60-73e6-9bdd-c94425b4d242" xlink:to="loc_us-gaap_InvestmentCompanyFinancialHighlightsTextBlock_019e2207-0b60-78fd-8da9-a0c42d271e15" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.mainstcapital.com/role/DIVIDENDSDISTRIBUTIONSANDTAXABLEINCOME" xlink:type="simple" xlink:href="main-20260630.xsd#DIVIDENDSDISTRIBUTIONSANDTAXABLEINCOME"/>
  <link:presentationLink xlink:role="http://www.mainstcapital.com/role/DIVIDENDSDISTRIBUTIONSANDTAXABLEINCOME" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxDisclosureAbstract_019e2207-0b60-7895-99f9-c80c42500da2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeTaxDisclosureAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_DividendDistributionsIncomeTaxDisclosureTextBlock_019e2207-0b60-7e09-a9a7-6df681135074" xlink:href="main-20260630.xsd#main_DividendDistributionsIncomeTaxDisclosureTextBlock"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_019e2207-0b60-7895-99f9-c80c42500da2" xlink:to="loc_main_DividendDistributionsIncomeTaxDisclosureTextBlock_019e2207-0b60-7e09-a9a7-6df681135074" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.mainstcapital.com/role/COMMONSTOCK" xlink:type="simple" xlink:href="main-20260630.xsd#COMMONSTOCK"/>
  <link:presentationLink xlink:role="http://www.mainstcapital.com/role/COMMONSTOCK" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityAbstract_019e2207-0b60-75ac-b3f1-89445fe4b5b9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityNoteDisclosureTextBlock_019e2207-0b60-71f3-ba4a-711cee214bd4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquityNoteDisclosureTextBlock"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityAbstract_019e2207-0b60-75ac-b3f1-89445fe4b5b9" xlink:to="loc_us-gaap_StockholdersEquityNoteDisclosureTextBlock_019e2207-0b60-71f3-ba4a-711cee214bd4" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.mainstcapital.com/role/DIVIDENDREINVESTMENTPLAN" xlink:type="simple" xlink:href="main-20260630.xsd#DIVIDENDREINVESTMENTPLAN"/>
  <link:presentationLink xlink:role="http://www.mainstcapital.com/role/DIVIDENDREINVESTMENTPLAN" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityAbstract_019e2207-0b60-7c2d-ac5c-e7bf6a6d31fb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_StockholdersEquityDividendReinvestmentPlanTextBlock_019e2207-0c30-7c16-9ca5-5400d478dd54" xlink:href="main-20260630.xsd#main_StockholdersEquityDividendReinvestmentPlanTextBlock"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityAbstract_019e2207-0b60-7c2d-ac5c-e7bf6a6d31fb" xlink:to="loc_main_StockholdersEquityDividendReinvestmentPlanTextBlock_019e2207-0c30-7c16-9ca5-5400d478dd54" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.mainstcapital.com/role/SHAREBASEDCOMPENSATION" xlink:type="simple" xlink:href="main-20260630.xsd#SHAREBASEDCOMPENSATION"/>
  <link:presentationLink xlink:role="http://www.mainstcapital.com/role/SHAREBASEDCOMPENSATION" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_019e2207-0c30-76b9-bf84-b35bdcaaeb16" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock_019e2207-0c30-7222-8550-cf649a150c61" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_019e2207-0c30-76b9-bf84-b35bdcaaeb16" xlink:to="loc_us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock_019e2207-0c30-7222-8550-cf649a150c61" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.mainstcapital.com/role/COMMITMENTSANDCONTINGENCIES" xlink:type="simple" xlink:href="main-20260630.xsd#COMMITMENTSANDCONTINGENCIES"/>
  <link:presentationLink xlink:role="http://www.mainstcapital.com/role/COMMITMENTSANDCONTINGENCIES" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommitmentsAndContingenciesDisclosureAbstract_019e2207-0c30-7167-bade-43dfc5f125a5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommitmentsAndContingenciesDisclosureAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommitmentsAndContingenciesDisclosureTextBlock_019e2207-0c30-7e3f-ac2e-83eccd0e2d97" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommitmentsAndContingenciesDisclosureTextBlock"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CommitmentsAndContingenciesDisclosureAbstract_019e2207-0c30-7167-bade-43dfc5f125a5" xlink:to="loc_us-gaap_CommitmentsAndContingenciesDisclosureTextBlock_019e2207-0c30-7e3f-ac2e-83eccd0e2d97" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.mainstcapital.com/role/RELATEDPARTYTRANSACTIONS" xlink:type="simple" xlink:href="main-20260630.xsd#RELATEDPARTYTRANSACTIONS"/>
  <link:presentationLink xlink:role="http://www.mainstcapital.com/role/RELATEDPARTYTRANSACTIONS" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsAbstract_019e2207-0c30-7e08-aa75-4b2bd484e34d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyTransactionsAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsDisclosureTextBlock_019e2207-0c30-71b2-b9a0-99ee39910e03" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyTransactionsDisclosureTextBlock"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RelatedPartyTransactionsAbstract_019e2207-0c30-7e08-aa75-4b2bd484e34d" xlink:to="loc_us-gaap_RelatedPartyTransactionsDisclosureTextBlock_019e2207-0c30-71b2-b9a0-99ee39910e03" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.mainstcapital.com/role/SUBSEQUENTEVENTS" xlink:type="simple" xlink:href="main-20260630.xsd#SUBSEQUENTEVENTS"/>
  <link:presentationLink xlink:role="http://www.mainstcapital.com/role/SUBSEQUENTEVENTS" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventsAbstract_019e2207-0c30-71bb-9127-9828b5e599c4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventsAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventsTextBlock_019e2207-0c30-74bb-9cff-717e2a3ce9e8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventsTextBlock"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SubsequentEventsAbstract_019e2207-0c30-71bb-9127-9828b5e599c4" xlink:to="loc_us-gaap_SubsequentEventsTextBlock_019e2207-0c30-74bb-9cff-717e2a3ce9e8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.mainstcapital.com/role/ConsolidatedScheduleofInvestmentsinandAdvancestoAffiliates" xlink:type="simple" xlink:href="main-20260630.xsd#ConsolidatedScheduleofInvestmentsinandAdvancestoAffiliates"/>
  <link:presentationLink xlink:role="http://www.mainstcapital.com/role/ConsolidatedScheduleofInvestmentsinandAdvancestoAffiliates" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentsInAndAdvancesToAffiliatesScheduleOfInvestmentsAbstract_019e2207-0c30-7442-8ba1-55c205b5b6f2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentsInAndAdvancesToAffiliatesScheduleOfInvestmentsAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentsInAndAdvancesToAffiliatesScheduleOfInvestmentsTextBlock_019e2207-0c30-7f61-b2ac-92376fb763c0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentsInAndAdvancesToAffiliatesScheduleOfInvestmentsTextBlock"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentsInAndAdvancesToAffiliatesScheduleOfInvestmentsAbstract_019e2207-0c30-7442-8ba1-55c205b5b6f2" xlink:to="loc_us-gaap_InvestmentsInAndAdvancesToAffiliatesScheduleOfInvestmentsTextBlock_019e2207-0c30-7f61-b2ac-92376fb763c0" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.mainstcapital.com/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESPolicies" xlink:type="simple" xlink:href="main-20260630.xsd#SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESPolicies"/>
  <link:presentationLink xlink:role="http://www.mainstcapital.com/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESPolicies" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountingPoliciesAbstract_019e2207-0b5f-7d48-9875-c26a72c899e6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccountingPoliciesAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BasisOfAccountingPolicyPolicyTextBlock_019e2207-0b5f-7503-97a4-ae6da41074f4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BasisOfAccountingPolicyPolicyTextBlock"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_019e2207-0b5f-7d48-9875-c26a72c899e6" xlink:to="loc_us-gaap_BasisOfAccountingPolicyPolicyTextBlock_019e2207-0b5f-7503-97a4-ae6da41074f4" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConsolidationPolicyTextBlock_019e2207-0b5f-7c1d-bfe1-f79924229b5c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConsolidationPolicyTextBlock"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_019e2207-0b5f-7d48-9875-c26a72c899e6" xlink:to="loc_us-gaap_ConsolidationPolicyTextBlock_019e2207-0b5f-7c1d-bfe1-f79924229b5c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentPolicyTextBlock_019e2207-0b5f-7d7a-af58-4d2a929d93d7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentPolicyTextBlock"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_019e2207-0b5f-7d48-9875-c26a72c899e6" xlink:to="loc_us-gaap_InvestmentPolicyTextBlock_019e2207-0b5f-7d7a-af58-4d2a929d93d7" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UseOfEstimates_019e2207-0b5f-7fb1-8a8b-b3a09ef2f28b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_UseOfEstimates"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_019e2207-0b5f-7d48-9875-c26a72c899e6" xlink:to="loc_us-gaap_UseOfEstimates_019e2207-0b5f-7fb1-8a8b-b3a09ef2f28b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsPolicyTextBlock_019e2207-0b5f-78f0-bc08-9b2bd0927371" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashAndCashEquivalentsPolicyTextBlock"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_019e2207-0b5f-7d48-9875-c26a72c899e6" xlink:to="loc_us-gaap_CashAndCashEquivalentsPolicyTextBlock_019e2207-0b5f-78f0-bc08-9b2bd0927371" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRecognitionInterest_019e2207-0b5f-7822-8883-1597fa6c96cb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueRecognitionInterest"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_019e2207-0b5f-7d48-9875-c26a72c899e6" xlink:to="loc_us-gaap_RevenueRecognitionInterest_019e2207-0b5f-7822-8883-1597fa6c96cb" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRecognitionDividends_019e2207-0b5f-79ae-9698-d5deb07c7acd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueRecognitionDividends"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_019e2207-0b5f-7d48-9875-c26a72c899e6" xlink:to="loc_us-gaap_RevenueRecognitionDividends_019e2207-0b5f-79ae-9698-d5deb07c7acd" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ManagementAndInvestmentAdvisoryFeesPolicy_019e2207-0b5f-707b-802f-0a16cd7b7ef1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ManagementAndInvestmentAdvisoryFeesPolicy"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_019e2207-0b5f-7d48-9875-c26a72c899e6" xlink:to="loc_us-gaap_ManagementAndInvestmentAdvisoryFeesPolicy_019e2207-0b5f-707b-802f-0a16cd7b7ef1" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtPolicyTextBlock_019e2207-0b5f-71dd-bcbc-464f7c49d6b5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtPolicyTextBlock"/>
    <link:presentationArc order="9" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_019e2207-0b5f-7d48-9875-c26a72c899e6" xlink:to="loc_us-gaap_DebtPolicyTextBlock_019e2207-0b5f-71dd-bcbc-464f7c49d6b5" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityPolicyTextBlock_019e2207-0b5f-7336-b038-b6502729a82c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquityPolicyTextBlock"/>
    <link:presentationArc order="10" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_019e2207-0b5f-7d48-9875-c26a72c899e6" xlink:to="loc_us-gaap_StockholdersEquityPolicyTextBlock_019e2207-0b5f-7336-b038-b6502729a82c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_UnearnedIncomePolicyTextBlock_019e2207-0b5f-70b5-80e4-26c233e5baad" xlink:href="main-20260630.xsd#main_UnearnedIncomePolicyTextBlock"/>
    <link:presentationArc order="11" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_019e2207-0b5f-7d48-9875-c26a72c899e6" xlink:to="loc_main_UnearnedIncomePolicyTextBlock_019e2207-0b5f-70b5-80e4-26c233e5baad" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationOptionAndIncentivePlansPolicy_019e2207-0b5f-7127-b26a-1628b86676f4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationOptionAndIncentivePlansPolicy"/>
    <link:presentationArc order="12" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_019e2207-0b5f-7d48-9875-c26a72c899e6" xlink:to="loc_us-gaap_ShareBasedCompensationOptionAndIncentivePlansPolicy_019e2207-0b5f-7127-b26a-1628b86676f4" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PostemploymentBenefitPlansPolicy_019e2207-0b5f-7f80-b8ed-4d3f1446880c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PostemploymentBenefitPlansPolicy"/>
    <link:presentationArc order="13" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_019e2207-0b5f-7d48-9875-c26a72c899e6" xlink:to="loc_us-gaap_PostemploymentBenefitPlansPolicy_019e2207-0b5f-7f80-b8ed-4d3f1446880c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxPolicyTextBlock_019e2207-0b5f-78dc-998f-407fa48c518b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeTaxPolicyTextBlock"/>
    <link:presentationArc order="14" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_019e2207-0b5f-7d48-9875-c26a72c899e6" xlink:to="loc_us-gaap_IncomeTaxPolicyTextBlock_019e2207-0b5f-78dc-998f-407fa48c518b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_NetRealizedGainsOrLossesAndNetUnrealizedAppreciationOrDepreciationPolicyTextBlock_019e2207-0b5f-72aa-8839-235a4a19d8bb" xlink:href="main-20260630.xsd#main_NetRealizedGainsOrLossesAndNetUnrealizedAppreciationOrDepreciationPolicyTextBlock"/>
    <link:presentationArc order="15" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_019e2207-0b5f-7d48-9875-c26a72c899e6" xlink:to="loc_main_NetRealizedGainsOrLossesAndNetUnrealizedAppreciationOrDepreciationPolicyTextBlock_019e2207-0b5f-72aa-8839-235a4a19d8bb" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueOfFinancialInstrumentsPolicy_019e2207-0b5f-7f6d-b26a-638a2d416932" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueOfFinancialInstrumentsPolicy"/>
    <link:presentationArc order="16" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_019e2207-0b5f-7d48-9875-c26a72c899e6" xlink:to="loc_us-gaap_FairValueOfFinancialInstrumentsPolicy_019e2207-0b5f-7f6d-b26a-638a2d416932" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerSharePolicyTextBlock_019e2207-0b5f-725b-8f9f-412bd425d860" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EarningsPerSharePolicyTextBlock"/>
    <link:presentationArc order="17" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_019e2207-0b5f-7d48-9875-c26a72c899e6" xlink:to="loc_us-gaap_EarningsPerSharePolicyTextBlock_019e2207-0b5f-725b-8f9f-412bd425d860" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingPolicyPolicyTextBlock_019e2207-0b5f-7b45-aa1d-589e6588b93d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentReportingPolicyPolicyTextBlock"/>
    <link:presentationArc order="18" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_019e2207-0b5f-7d48-9875-c26a72c899e6" xlink:to="loc_us-gaap_SegmentReportingPolicyPolicyTextBlock_019e2207-0b5f-7b45-aa1d-589e6588b93d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_019e2207-0b5f-72fc-badc-df11f176a906" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock"/>
    <link:presentationArc order="19" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_019e2207-0b5f-7d48-9875-c26a72c899e6" xlink:to="loc_us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_019e2207-0b5f-72fc-badc-df11f176a906" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementPolicyPolicyTextBlock_019e2207-0b5f-78dd-8f53-790ce011c698" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementPolicyPolicyTextBlock"/>
    <link:presentationArc order="20" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_019e2207-0b5f-7d48-9875-c26a72c899e6" xlink:to="loc_us-gaap_FairValueMeasurementPolicyPolicyTextBlock_019e2207-0b5f-78dd-8f53-790ce011c698" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.mainstcapital.com/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESTables" xlink:type="simple" xlink:href="main-20260630.xsd#SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESTables"/>
  <link:presentationLink xlink:role="http://www.mainstcapital.com/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESTables" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountingPoliciesAbstract_019e2207-0b5f-74ae-b5d4-cc922744400c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccountingPoliciesAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentIncomeTextBlock_019e2207-0b5f-7f4a-8d17-332ea3b7a023" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentIncomeTextBlock"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_019e2207-0b5f-74ae-b5d4-cc922744400c" xlink:to="loc_us-gaap_InvestmentIncomeTextBlock_019e2207-0b5f-7f4a-8d17-332ea3b7a023" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.mainstcapital.com/role/FAIRVALUEHIERARCHYFORINVESTMENTSPORTFOLIOCOMPOSITIONTables" xlink:type="simple" xlink:href="main-20260630.xsd#FAIRVALUEHIERARCHYFORINVESTMENTSPORTFOLIOCOMPOSITIONTables"/>
  <link:presentationLink xlink:role="http://www.mainstcapital.com/role/FAIRVALUEHIERARCHYFORINVESTMENTSPORTFOLIOCOMPOSITIONTables" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueDisclosuresAbstract_019e2207-0b5f-74cb-9bf5-ee087f0a3723" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueDisclosuresAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTableTextBlock_019e2207-0b5f-775b-a874-55a2b0a04c84" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTableTextBlock"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueDisclosuresAbstract_019e2207-0b5f-74cb-9bf5-ee087f0a3723" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTableTextBlock_019e2207-0b5f-775b-a874-55a2b0a04c84" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTextBlock_019e2207-0b5f-7e58-9e2c-b838bb33adbf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTextBlock"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueDisclosuresAbstract_019e2207-0b5f-74cb-9bf5-ee087f0a3723" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTextBlock_019e2207-0b5f-7e58-9e2c-b838bb33adbf" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisTextBlock_019e2207-0b5f-7f81-af95-3f0c76fe7da1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisTextBlock"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueDisclosuresAbstract_019e2207-0b5f-74cb-9bf5-ee087f0a3723" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisTextBlock_019e2207-0b5f-7f81-af95-3f0c76fe7da1" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SummaryInvestmentHoldingsTextBlock_019e2207-0b5f-7fc3-bade-be1d3967621e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SummaryInvestmentHoldingsTextBlock"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueDisclosuresAbstract_019e2207-0b5f-74cb-9bf5-ee087f0a3723" xlink:to="loc_us-gaap_SummaryInvestmentHoldingsTextBlock_019e2207-0b5f-7fc3-bade-be1d3967621e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.mainstcapital.com/role/EXTERNALINVESTMENTMANAGERTables" xlink:type="simple" xlink:href="main-20260630.xsd#EXTERNALINVESTMENTMANAGERTables"/>
  <link:presentationLink xlink:role="http://www.mainstcapital.com/role/EXTERNALINVESTMENTMANAGERTables" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentCompanyAbstract_019e2207-0b60-7e6a-849a-1d7bcfc73f9d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentCompanyAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentCompanyNonconsolidatedSubsidiarySummarizedFinancialInformationTableTextBlock_019e2207-0b60-7012-8ed5-56ebc6b3c477" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentCompanyNonconsolidatedSubsidiarySummarizedFinancialInformationTableTextBlock"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentCompanyAbstract_019e2207-0b60-7e6a-849a-1d7bcfc73f9d" xlink:to="loc_us-gaap_InvestmentCompanyNonconsolidatedSubsidiarySummarizedFinancialInformationTableTextBlock_019e2207-0b60-7012-8ed5-56ebc6b3c477" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_ScheduleOfAccruedIncentiveFeesOnCapitalGainsTableTextBlock_019fb8ef-217f-71ef-9fbe-fa44af251246" xlink:href="main-20260630.xsd#main_ScheduleOfAccruedIncentiveFeesOnCapitalGainsTableTextBlock"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentCompanyAbstract_019e2207-0b60-7e6a-849a-1d7bcfc73f9d" xlink:to="loc_main_ScheduleOfAccruedIncentiveFeesOnCapitalGainsTableTextBlock_019fb8ef-217f-71ef-9fbe-fa44af251246" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.mainstcapital.com/role/DEBTTables" xlink:type="simple" xlink:href="main-20260630.xsd#DEBTTables"/>
  <link:presentationLink xlink:role="http://www.mainstcapital.com/role/DEBTTables" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtDisclosureAbstract_019e2207-0b60-73c7-90c4-4e88ce73ae52" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtDisclosureAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDebtTableTextBlock_019e2207-0b60-70c4-9e70-4093fb84d8b3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfDebtTableTextBlock"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtDisclosureAbstract_019e2207-0b60-73c7-90c4-4e88ce73ae52" xlink:to="loc_us-gaap_ScheduleOfDebtTableTextBlock_019e2207-0b60-70c4-9e70-4093fb84d8b3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeAndInterestExpenseDisclosureTableTextBlock_019e2207-0b60-765a-9612-4ef4abd6af68" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestIncomeAndInterestExpenseDisclosureTableTextBlock"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtDisclosureAbstract_019e2207-0b60-73c7-90c4-4e88ce73ae52" xlink:to="loc_us-gaap_InterestIncomeAndInterestExpenseDisclosureTableTextBlock_019e2207-0b60-765a-9612-4ef4abd6af68" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScheduleOfCondensedFinancialStatementsTableTextBlock_019e2207-0b60-7663-976c-a8c89d402e9e" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ScheduleOfCondensedFinancialStatementsTableTextBlock"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtDisclosureAbstract_019e2207-0b60-73c7-90c4-4e88ce73ae52" xlink:to="loc_srt_ScheduleOfCondensedFinancialStatementsTableTextBlock_019e2207-0b60-7663-976c-a8c89d402e9e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.mainstcapital.com/role/FINANCIALHIGHLIGHTSTables" xlink:type="simple" xlink:href="main-20260630.xsd#FINANCIALHIGHLIGHTSTables"/>
  <link:presentationLink xlink:role="http://www.mainstcapital.com/role/FINANCIALHIGHLIGHTSTables" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentCompanyAbstract_019e2207-0b60-7f4b-961e-d78bd61b7161" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentCompanyAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentCompanyFinancialHighlightsTableTextBlock_019e2207-0b60-741f-bdae-8a01ab60ee8f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentCompanyFinancialHighlightsTableTextBlock"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentCompanyAbstract_019e2207-0b60-7f4b-961e-d78bd61b7161" xlink:to="loc_us-gaap_InvestmentCompanyFinancialHighlightsTableTextBlock_019e2207-0b60-741f-bdae-8a01ab60ee8f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.mainstcapital.com/role/DIVIDENDSDISTRIBUTIONSANDTAXABLEINCOMETables" xlink:type="simple" xlink:href="main-20260630.xsd#DIVIDENDSDISTRIBUTIONSANDTAXABLEINCOMETables"/>
  <link:presentationLink xlink:role="http://www.mainstcapital.com/role/DIVIDENDSDISTRIBUTIONSANDTAXABLEINCOMETables" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxDisclosureAbstract_019e2207-0b60-7bab-ad3f-fc76e69dc850" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeTaxDisclosureAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsDeclaredTableTextBlock_019e2207-0b60-7b5b-91e5-1e8b88270503" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DividendsDeclaredTableTextBlock"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_019e2207-0b60-7bab-ad3f-fc76e69dc850" xlink:to="loc_us-gaap_DividendsDeclaredTableTextBlock_019e2207-0b60-7b5b-91e5-1e8b88270503" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FederalIncomeTaxNoteTextBlock_019e2207-0b60-796a-883d-7ae9573e5b57" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FederalIncomeTaxNoteTextBlock"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_019e2207-0b60-7bab-ad3f-fc76e69dc850" xlink:to="loc_us-gaap_FederalIncomeTaxNoteTextBlock_019e2207-0b60-796a-883d-7ae9573e5b57" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock_019e2207-0b60-7540-9cc4-e1d056d56e37" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_019e2207-0b60-7bab-ad3f-fc76e69dc850" xlink:to="loc_us-gaap_ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock_019e2207-0b60-7540-9cc4-e1d056d56e37" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.mainstcapital.com/role/DIVIDENDREINVESTMENTPLANTables" xlink:type="simple" xlink:href="main-20260630.xsd#DIVIDENDREINVESTMENTPLANTables"/>
  <link:presentationLink xlink:role="http://www.mainstcapital.com/role/DIVIDENDREINVESTMENTPLANTables" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityAbstract_019e2207-0c30-78bc-b8aa-51a08fa8644b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_ScheduleOfSummarizedDividendReinvestmentPlanInformationTableTextBlock_019e2207-0c30-7f1e-8d18-6a480a5cffd3" xlink:href="main-20260630.xsd#main_ScheduleOfSummarizedDividendReinvestmentPlanInformationTableTextBlock"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityAbstract_019e2207-0c30-78bc-b8aa-51a08fa8644b" xlink:to="loc_main_ScheduleOfSummarizedDividendReinvestmentPlanInformationTableTextBlock_019e2207-0c30-7f1e-8d18-6a480a5cffd3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.mainstcapital.com/role/SHAREBASEDCOMPENSATIONTables" xlink:type="simple" xlink:href="main-20260630.xsd#SHAREBASEDCOMPENSATIONTables"/>
  <link:presentationLink xlink:role="http://www.mainstcapital.com/role/SHAREBASEDCOMPENSATIONTables" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_019e2207-0c30-7784-8b87-5114aa7cdf64" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisclosureOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTextBlock_019e2207-0c30-7dac-8bd3-f2883562268a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisclosureOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTextBlock"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_019e2207-0c30-7784-8b87-5114aa7cdf64" xlink:to="loc_us-gaap_DisclosureOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTextBlock_019e2207-0c30-7dac-8bd3-f2883562268a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSharebasedCompensationRestrictedStockAndRestrictedStockUnitsActivityTableTextBlock_019e2207-0c30-7590-a15e-c0c33904cfdc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfSharebasedCompensationRestrictedStockAndRestrictedStockUnitsActivityTableTextBlock"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_019e2207-0c30-7784-8b87-5114aa7cdf64" xlink:to="loc_us-gaap_ScheduleOfSharebasedCompensationRestrictedStockAndRestrictedStockUnitsActivityTableTextBlock_019e2207-0c30-7590-a15e-c0c33904cfdc" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.mainstcapital.com/role/COMMITMENTSANDCONTINGENCIESTables" xlink:type="simple" xlink:href="main-20260630.xsd#COMMITMENTSANDCONTINGENCIESTables"/>
  <link:presentationLink xlink:role="http://www.mainstcapital.com/role/COMMITMENTSANDCONTINGENCIESTables" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommitmentsAndContingenciesDisclosureAbstract_019e2207-0c30-7118-ae0f-d5a02130a6e7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommitmentsAndContingenciesDisclosureAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_InvestmentCompanyOutstandingCapitalCommitmentsTableTextBlock_019e2207-0c30-7d08-8ea6-ef8ec3e15ed6" xlink:href="main-20260630.xsd#main_InvestmentCompanyOutstandingCapitalCommitmentsTableTextBlock"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CommitmentsAndContingenciesDisclosureAbstract_019e2207-0c30-7118-ae0f-d5a02130a6e7" xlink:to="loc_main_InvestmentCompanyOutstandingCapitalCommitmentsTableTextBlock_019e2207-0c30-7d08-8ea6-ef8ec3e15ed6" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.mainstcapital.com/role/ConsolidatedScheduleofInvestmentsinandAdvancestoAffiliatesTables" xlink:type="simple" xlink:href="main-20260630.xsd#ConsolidatedScheduleofInvestmentsinandAdvancestoAffiliatesTables"/>
  <link:presentationLink xlink:role="http://www.mainstcapital.com/role/ConsolidatedScheduleofInvestmentsinandAdvancestoAffiliatesTables" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentsInAndAdvancesToAffiliatesScheduleOfInvestmentsAbstract_019e2207-0c30-7d24-88e0-7feae0a2892a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentsInAndAdvancesToAffiliatesScheduleOfInvestmentsAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfInvestmentsInAndAdvancesToAffiliatesScheduleOfInvestmentsTableTextBlock_019e2207-0c30-7af1-b48e-95af06067fd7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfInvestmentsInAndAdvancesToAffiliatesScheduleOfInvestmentsTableTextBlock"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentsInAndAdvancesToAffiliatesScheduleOfInvestmentsAbstract_019e2207-0c30-7d24-88e0-7feae0a2892a" xlink:to="loc_us-gaap_ScheduleOfInvestmentsInAndAdvancesToAffiliatesScheduleOfInvestmentsTableTextBlock_019e2207-0c30-7af1-b48e-95af06067fd7" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.mainstcapital.com/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESNarrativeDetails" xlink:type="simple" xlink:href="main-20260630.xsd#SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESNarrativeDetails"/>
  <link:presentationLink xlink:role="http://www.mainstcapital.com/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountingPoliciesAbstract_019e2207-0b5f-7d23-9454-b1adce92d562" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccountingPoliciesAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfInvestmentsTable_019e2207-0b5f-70c7-a9e0-bf00744e4158" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfInvestmentsTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_019e2207-0b5f-7d23-9454-b1adce92d562" xlink:to="loc_us-gaap_ScheduleOfInvestmentsTable_019e2207-0b5f-70c7-a9e0-bf00744e4158" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeAxis_019e2207-0b5f-71bb-b265-971df5872497" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentTypeAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfInvestmentsTable_019e2207-0b5f-70c7-a9e0-bf00744e4158" xlink:to="loc_us-gaap_InvestmentTypeAxis_019e2207-0b5f-71bb-b265-971df5872497" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_019e2207-0b5f-7de6-ae9f-f004991ff666" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentTypeAxis_019e2207-0b5f-71bb-b265-971df5872497" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_019e2207-0b5f-7de6-ae9f-f004991ff666" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_LowerMiddleMarketPortfolioMember_019e2207-0b5f-7e33-8e08-daf335f4b243" xlink:href="main-20260630.xsd#main_LowerMiddleMarketPortfolioMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019e2207-0b5f-7de6-ae9f-f004991ff666" xlink:to="loc_main_LowerMiddleMarketPortfolioMember_019e2207-0b5f-7e33-8e08-daf335f4b243" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_PrivateLoanPortfolioMember_019e2207-0b5f-710d-86c4-e16e1d797441" xlink:href="main-20260630.xsd#main_PrivateLoanPortfolioMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019e2207-0b5f-7de6-ae9f-f004991ff666" xlink:to="loc_main_PrivateLoanPortfolioMember_019e2207-0b5f-710d-86c4-e16e1d797441" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_MiddleMarketPortfolioMember_019e2207-0b5f-7533-8048-cef20b9fc103" xlink:href="main-20260630.xsd#main_MiddleMarketPortfolioMember"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019e2207-0b5f-7de6-ae9f-f004991ff666" xlink:to="loc_main_MiddleMarketPortfolioMember_019e2207-0b5f-7533-8048-cef20b9fc103" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAggregatedInvestmentsMember_019e2207-0b5f-795c-850f-1506cc2eb17e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherAggregatedInvestmentsMember"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019e2207-0b5f-7de6-ae9f-f004991ff666" xlink:to="loc_us-gaap_OtherAggregatedInvestmentsMember_019e2207-0b5f-795c-850f-1506cc2eb17e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019e2207-0b5f-73c5-b3e1-f9932e83f88c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConcentrationRiskByBenchmarkAxis"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfInvestmentsTable_019e2207-0b5f-70c7-a9e0-bf00744e4158" xlink:to="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019e2207-0b5f-73c5-b3e1-f9932e83f88c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019e2207-0b5f-7719-9a75-7c4fa5a4af25" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019e2207-0b5f-73c5-b3e1-f9932e83f88c" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019e2207-0b5f-7719-9a75-7c4fa5a4af25" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_InvestmentOwnedAtFairValueMember_019e2207-0b5f-7b58-b52c-57e421920955" xlink:href="main-20260630.xsd#main_InvestmentOwnedAtFairValueMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019e2207-0b5f-7719-9a75-7c4fa5a4af25" xlink:to="loc_main_InvestmentOwnedAtFairValueMember_019e2207-0b5f-7b58-b52c-57e421920955" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_InvestmentOwnedAtCostMember_019e2207-0b5f-76dc-b75a-9b0e24b68da2" xlink:href="main-20260630.xsd#main_InvestmentOwnedAtCostMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019e2207-0b5f-7719-9a75-7c4fa5a4af25" xlink:to="loc_main_InvestmentOwnedAtCostMember_019e2207-0b5f-76dc-b75a-9b0e24b68da2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByTypeAxis_019e2207-0b5f-7d43-8dbc-ed92d5ed3911" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConcentrationRiskByTypeAxis"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfInvestmentsTable_019e2207-0b5f-70c7-a9e0-bf00744e4158" xlink:to="loc_us-gaap_ConcentrationRiskByTypeAxis_019e2207-0b5f-7d43-8dbc-ed92d5ed3911" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_019e2207-0b5f-7a77-a2c1-ca2818e927fc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_019e2207-0b5f-7d43-8dbc-ed92d5ed3911" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_019e2207-0b5f-7a77-a2c1-ca2818e927fc" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_InvestmentTypeConcentrationRiskMember_019e2207-0b5f-775d-aef6-65ed2f51df3a" xlink:href="main-20260630.xsd#main_InvestmentTypeConcentrationRiskMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ConcentrationRiskTypeDomain_019e2207-0b5f-7a77-a2c1-ca2818e927fc" xlink:to="loc_main_InvestmentTypeConcentrationRiskMember_019e2207-0b5f-775d-aef6-65ed2f51df3a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentPerformanceStatusAxis_019e2207-0b5f-74c6-828d-67b398f72c7c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialInstrumentPerformanceStatusAxis"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfInvestmentsTable_019e2207-0b5f-70c7-a9e0-bf00744e4158" xlink:to="loc_us-gaap_FinancialInstrumentPerformanceStatusAxis_019e2207-0b5f-74c6-828d-67b398f72c7c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentPerformanceStatusDomain_019e2207-0b5f-76fe-bdf8-0b3b58779899" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialInstrumentPerformanceStatusDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FinancialInstrumentPerformanceStatusAxis_019e2207-0b5f-74c6-828d-67b398f72c7c" xlink:to="loc_us-gaap_FinancialInstrumentPerformanceStatusDomain_019e2207-0b5f-76fe-bdf8-0b3b58779899" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonperformingFinancingReceivableMember_019e2207-0b5f-7494-bb62-4feaaaa3b5e8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NonperformingFinancingReceivableMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FinancialInstrumentPerformanceStatusDomain_019e2207-0b5f-76fe-bdf8-0b3b58779899" xlink:to="loc_us-gaap_NonperformingFinancingReceivableMember_019e2207-0b5f-7494-bb62-4feaaaa3b5e8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_019e2207-0b5f-7c67-bc3e-8befdc533b24" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditFacilityAxis"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfInvestmentsTable_019e2207-0b5f-70c7-a9e0-bf00744e4158" xlink:to="loc_us-gaap_CreditFacilityAxis_019e2207-0b5f-7c67-bc3e-8befdc533b24" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019e2207-0b5f-7276-aecc-cc33853b4665" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditFacilityDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CreditFacilityAxis_019e2207-0b5f-7c67-bc3e-8befdc533b24" xlink:to="loc_us-gaap_CreditFacilityDomain_019e2207-0b5f-7276-aecc-cc33853b4665" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_019e2207-0b5f-7077-bcf7-93ace5e8b458" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CreditFacilityDomain_019e2207-0b5f-7276-aecc-cc33853b4665" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_019e2207-0b5f-7077-bcf7-93ace5e8b458" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_019e2207-0b5f-7d41-8d0f-ae97ef9d26b3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfInvestmentsTable_019e2207-0b5f-70c7-a9e0-bf00744e4158" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_019e2207-0b5f-7d41-8d0f-ae97ef9d26b3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019e2207-0b5f-7bc5-96dd-11b5af9d9d2c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019e2207-0b5f-7d41-8d0f-ae97ef9d26b3" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019e2207-0b5f-7bc5-96dd-11b5af9d9d2c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_019e2207-0b5f-7c03-8c71-29bab9605995" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019e2207-0b5f-7bc5-96dd-11b5af9d9d2c" xlink:to="loc_us-gaap_LineOfCreditMember_019e2207-0b5f-7c03-8c71-29bab9605995" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfInvestmentsLineItems_019e2207-0b5f-79e9-8abe-611395138920" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfInvestmentsLineItems"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfInvestmentsTable_019e2207-0b5f-70c7-a9e0-bf00744e4158" xlink:to="loc_us-gaap_ScheduleOfInvestmentsLineItems_019e2207-0b5f-79e9-8abe-611395138920" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_InvestmentCompanyConsultationPeriodSubsequentToInitialInvestment_019e2207-0b5f-70b9-b6e7-7ce4f139c7f4" xlink:href="main-20260630.xsd#main_InvestmentCompanyConsultationPeriodSubsequentToInitialInvestment"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019e2207-0b5f-79e9-8abe-611395138920" xlink:to="loc_main_InvestmentCompanyConsultationPeriodSubsequentToInitialInvestment_019e2207-0b5f-70b9-b6e7-7ce4f139c7f4" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_InvestmentCompanyNumberOfPortfolioCompaniesWithAnnualThirdPartyAppraisalWasObtainedReviewedAndCertified_019e2207-0b5f-7559-9e9e-23c41b9292a0" xlink:href="main-20260630.xsd#main_InvestmentCompanyNumberOfPortfolioCompaniesWithAnnualThirdPartyAppraisalWasObtainedReviewedAndCertified"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019e2207-0b5f-79e9-8abe-611395138920" xlink:to="loc_main_InvestmentCompanyNumberOfPortfolioCompaniesWithAnnualThirdPartyAppraisalWasObtainedReviewedAndCertified_019e2207-0b5f-7559-9e9e-23c41b9292a0" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskPercentage1_019e2207-0b5f-7c2c-94c0-f82a7832e090" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConcentrationRiskPercentage1"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019e2207-0b5f-79e9-8abe-611395138920" xlink:to="loc_us-gaap_ConcentrationRiskPercentage1_019e2207-0b5f-7c2c-94c0-f82a7832e090" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_InvestmentCompanyPercentageOfPortfolioWithAnnualThirdPartyAppraisalWasObtainedReviewedAndCertified_019e2207-0b5f-76ce-a736-dda710e48bff" xlink:href="main-20260630.xsd#main_InvestmentCompanyPercentageOfPortfolioWithAnnualThirdPartyAppraisalWasObtainedReviewedAndCertified"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019e2207-0b5f-79e9-8abe-611395138920" xlink:to="loc_main_InvestmentCompanyPercentageOfPortfolioWithAnnualThirdPartyAppraisalWasObtainedReviewedAndCertified_019e2207-0b5f-76ce-a736-dda710e48bff" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_InvestmentCompanyPortfolioInvestmentsLimitedConsultationWithFinancialAdvisoryServicesFirmPercentage_019e2207-0b5f-75e8-a545-cccdfe0239ee" xlink:href="main-20260630.xsd#main_InvestmentCompanyPortfolioInvestmentsLimitedConsultationWithFinancialAdvisoryServicesFirmPercentage"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019e2207-0b5f-79e9-8abe-611395138920" xlink:to="loc_main_InvestmentCompanyPortfolioInvestmentsLimitedConsultationWithFinancialAdvisoryServicesFirmPercentage_019e2207-0b5f-75e8-a545-cccdfe0239ee" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MoneyMarketFundsAtCarryingValue_019e2207-0b5f-7c32-93fe-2e69f1a524d9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MoneyMarketFundsAtCarryingValue"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019e2207-0b5f-79e9-8abe-611395138920" xlink:to="loc_us-gaap_MoneyMarketFundsAtCarryingValue_019e2207-0b5f-7c32-93fe-2e69f1a524d9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashUninsuredAmount_019e2207-0b5f-701a-a6e4-66ab5af1ece7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashUninsuredAmount"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019e2207-0b5f-79e9-8abe-611395138920" xlink:to="loc_us-gaap_CashUninsuredAmount_019e2207-0b5f-701a-a6e4-66ab5af1ece7" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentOwnedAtFairValue_019e2207-0b5f-768f-b97c-709408589deb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentOwnedAtFairValue"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019e2207-0b5f-79e9-8abe-611395138920" xlink:to="loc_us-gaap_InvestmentOwnedAtFairValue_019e2207-0b5f-768f-b97c-709408589deb" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentOwnedAtCost_019e2207-0b5f-7e72-963c-ccaf4ab107e3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentOwnedAtCost"/>
    <link:presentationArc order="9" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019e2207-0b5f-79e9-8abe-611395138920" xlink:to="loc_us-gaap_InvestmentOwnedAtCost_019e2207-0b5f-7e72-963c-ccaf4ab107e3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_InvestmentCompanyPercentageOfTotalInvestmentIncomeAttributableToNoncashPaidInKindInterestIncome_019e2207-0b5f-7114-873d-2882a624a3ac" xlink:href="main-20260630.xsd#main_InvestmentCompanyPercentageOfTotalInvestmentIncomeAttributableToNoncashPaidInKindInterestIncome"/>
    <link:presentationArc order="10" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019e2207-0b5f-79e9-8abe-611395138920" xlink:to="loc_main_InvestmentCompanyPercentageOfTotalInvestmentIncomeAttributableToNoncashPaidInKindInterestIncome_019e2207-0b5f-7114-873d-2882a624a3ac" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_InvestmentCompanyPercentageOfTotalInvestmentIncomeAttributableToNoncashCumulativeDividendIncome_019e2207-0b5f-744a-a733-d6de23b10834" xlink:href="main-20260630.xsd#main_InvestmentCompanyPercentageOfTotalInvestmentIncomeAttributableToNoncashCumulativeDividendIncome"/>
    <link:presentationArc order="11" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019e2207-0b5f-79e9-8abe-611395138920" xlink:to="loc_main_InvestmentCompanyPercentageOfTotalInvestmentIncomeAttributableToNoncashCumulativeDividendIncome_019e2207-0b5f-744a-a733-d6de23b10834" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityCommitmentFeePercentage_019e2207-0b5f-7282-853e-8a1fd4ab7566" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditFacilityCommitmentFeePercentage"/>
    <link:presentationArc order="12" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019e2207-0b5f-79e9-8abe-611395138920" xlink:to="loc_us-gaap_LineOfCreditFacilityCommitmentFeePercentage_019e2207-0b5f-7282-853e-8a1fd4ab7566" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_InvestmentCompanyPercentageOfTotalInvestmentIncomeAttributableToInterestIncomeDebtInvestmentsNet_019e2207-0b5f-7694-904f-07e6344fa548" xlink:href="main-20260630.xsd#main_InvestmentCompanyPercentageOfTotalInvestmentIncomeAttributableToInterestIncomeDebtInvestmentsNet"/>
    <link:presentationArc order="13" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019e2207-0b5f-79e9-8abe-611395138920" xlink:to="loc_main_InvestmentCompanyPercentageOfTotalInvestmentIncomeAttributableToInterestIncomeDebtInvestmentsNet_019e2207-0b5f-7694-904f-07e6344fa548" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfOperatingSegments_019e2207-0b5f-7f11-b3d5-1153a846d457" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NumberOfOperatingSegments"/>
    <link:presentationArc order="14" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019e2207-0b5f-79e9-8abe-611395138920" xlink:to="loc_us-gaap_NumberOfOperatingSegments_019e2207-0b5f-7f11-b3d5-1153a846d457" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfReportableSegments_019e2207-0b5f-7fd8-9687-102c856e2232" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NumberOfReportableSegments"/>
    <link:presentationArc order="15" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019e2207-0b5f-79e9-8abe-611395138920" xlink:to="loc_us-gaap_NumberOfReportableSegments_019e2207-0b5f-7fd8-9687-102c856e2232" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.mainstcapital.com/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESScheduleofInvestmentIncomeDetails" xlink:type="simple" xlink:href="main-20260630.xsd#SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESScheduleofInvestmentIncomeDetails"/>
  <link:presentationLink xlink:role="http://www.mainstcapital.com/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESScheduleofInvestmentIncomeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountingPoliciesAbstract_019e2207-0b5f-71ca-a4ee-e7275a519832" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccountingPoliciesAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentIncomeInterest_019e2207-0b5f-7632-a462-5509a06c5b4d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentIncomeInterest"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_019e2207-0b5f-71ca-a4ee-e7275a519832" xlink:to="loc_us-gaap_InvestmentIncomeInterest_019e2207-0b5f-7632-a462-5509a06c5b4d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentIncomeDividend_019e2207-0b5f-7cbf-91cf-fca6aed604b9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentIncomeDividend"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_019e2207-0b5f-71ca-a4ee-e7275a519832" xlink:to="loc_us-gaap_InvestmentIncomeDividend_019e2207-0b5f-7cbf-91cf-fca6aed604b9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FeeIncome_019e2207-0b5f-7a40-9a28-14dce3a5e541" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FeeIncome"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_019e2207-0b5f-71ca-a4ee-e7275a519832" xlink:to="loc_us-gaap_FeeIncome_019e2207-0b5f-7a40-9a28-14dce3a5e541" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GrossInvestmentIncomeOperating_019e2207-0b5f-78d4-8858-fd84f018d8eb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GrossInvestmentIncomeOperating"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_019e2207-0b5f-71ca-a4ee-e7275a519832" xlink:to="loc_us-gaap_GrossInvestmentIncomeOperating_019e2207-0b5f-78d4-8858-fd84f018d8eb" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.mainstcapital.com/role/FAIRVALUEHIERARCHYFORINVESTMENTSPORTFOLIOCOMPOSITIONNarrativeDetails" xlink:type="simple" xlink:href="main-20260630.xsd#FAIRVALUEHIERARCHYFORINVESTMENTSPORTFOLIOCOMPOSITIONNarrativeDetails"/>
  <link:presentationLink xlink:role="http://www.mainstcapital.com/role/FAIRVALUEHIERARCHYFORINVESTMENTSPORTFOLIOCOMPOSITIONNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueDisclosuresAbstract_019e2207-0b5f-71f3-95d9-a7339b6cabce" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueDisclosuresAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019e2207-0b5f-7dbc-b060-56542bf9cf5f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueDisclosuresAbstract_019e2207-0b5f-71f3-95d9-a7339b6cabce" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019e2207-0b5f-7dbc-b060-56542bf9cf5f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeAxis_019e2207-0b5f-78d3-a4c0-845494721882" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentTypeAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019e2207-0b5f-7dbc-b060-56542bf9cf5f" xlink:to="loc_us-gaap_InvestmentTypeAxis_019e2207-0b5f-78d3-a4c0-845494721882" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_019e2207-0b5f-7382-af35-bad213559baa" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentTypeAxis_019e2207-0b5f-78d3-a4c0-845494721882" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_019e2207-0b5f-7382-af35-bad213559baa" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermInvestmentsMember_019e2207-0b5f-7dc4-b9be-b0d85e01ccaf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShortTermInvestmentsMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019e2207-0b5f-7382-af35-bad213559baa" xlink:to="loc_us-gaap_ShortTermInvestmentsMember_019e2207-0b5f-7dc4-b9be-b0d85e01ccaf" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_LowerMiddleMarketPortfolioMember_019e2207-0b5f-7262-ae88-ab3cd0761965" xlink:href="main-20260630.xsd#main_LowerMiddleMarketPortfolioMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019e2207-0b5f-7382-af35-bad213559baa" xlink:to="loc_main_LowerMiddleMarketPortfolioMember_019e2207-0b5f-7262-ae88-ab3cd0761965" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_PrivateLoanPortfolioMember_019e2207-0b5f-7684-b5bc-8aaaa79b1ad3" xlink:href="main-20260630.xsd#main_PrivateLoanPortfolioMember"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019e2207-0b5f-7382-af35-bad213559baa" xlink:to="loc_main_PrivateLoanPortfolioMember_019e2207-0b5f-7684-b5bc-8aaaa79b1ad3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_MiddleMarketPortfolioMember_019e2207-0b5f-7c6e-8a40-ecff1e90d4a0" xlink:href="main-20260630.xsd#main_MiddleMarketPortfolioMember"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019e2207-0b5f-7382-af35-bad213559baa" xlink:to="loc_main_MiddleMarketPortfolioMember_019e2207-0b5f-7c6e-8a40-ecff1e90d4a0" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAggregatedInvestmentsMember_019e2207-0b5f-741f-a91d-e2a4c40a9091" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherAggregatedInvestmentsMember"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019e2207-0b5f-7382-af35-bad213559baa" xlink:to="loc_us-gaap_OtherAggregatedInvestmentsMember_019e2207-0b5f-741f-a91d-e2a4c40a9091" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_ExternalInvestmentManagerInvestmentsMember_019e2207-0b5f-7df1-84f1-dbe045fffbb0" xlink:href="main-20260630.xsd#main_ExternalInvestmentManagerInvestmentsMember"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019e2207-0b5f-7382-af35-bad213559baa" xlink:to="loc_main_ExternalInvestmentManagerInvestmentsMember_019e2207-0b5f-7df1-84f1-dbe045fffbb0" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019e2207-0b5f-7ddb-996e-89900755b108" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeAxis"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019e2207-0b5f-7dbc-b060-56542bf9cf5f" xlink:to="loc_srt_RangeAxis_019e2207-0b5f-7ddb-996e-89900755b108" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019e2207-0b5f-7623-b083-4bd58f6f9b08" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeAxis_019e2207-0b5f-7ddb-996e-89900755b108" xlink:to="loc_srt_RangeMember_019e2207-0b5f-7623-b083-4bd58f6f9b08" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019e2207-0b5f-7e89-88fc-6256ece929d6" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MinimumMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeMember_019e2207-0b5f-7623-b083-4bd58f6f9b08" xlink:to="loc_srt_MinimumMember_019e2207-0b5f-7e89-88fc-6256ece929d6" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019e2207-0b5f-7bce-b045-de2b4b59ee44" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MaximumMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeMember_019e2207-0b5f-7623-b083-4bd58f6f9b08" xlink:to="loc_srt_MaximumMember_019e2207-0b5f-7bce-b045-de2b4b59ee44" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019e2207-0b5f-7767-a72b-524122d0b22b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019e2207-0b5f-7dbc-b060-56542bf9cf5f" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019e2207-0b5f-7767-a72b-524122d0b22b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e2207-0b5f-7a99-9566-0d509e84442d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019e2207-0b5f-7767-a72b-524122d0b22b" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e2207-0b5f-7a99-9566-0d509e84442d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesMember_019e2207-0b5f-7c6b-b5c4-d4db8b20f75a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e2207-0b5f-7a99-9566-0d509e84442d" xlink:to="loc_us-gaap_DebtSecuritiesMember_019e2207-0b5f-7c6b-b5c4-d4db8b20f75a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CounterpartyNameAxis_019e2207-0b5f-753c-9b3c-de77cdb518dd" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_CounterpartyNameAxis"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019e2207-0b5f-7dbc-b060-56542bf9cf5f" xlink:to="loc_srt_CounterpartyNameAxis_019e2207-0b5f-753c-9b3c-de77cdb518dd" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019e2207-0b5f-7f80-bdd7-1fea392ccc02" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_CounterpartyNameAxis_019e2207-0b5f-753c-9b3c-de77cdb518dd" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019e2207-0b5f-7f80-bdd7-1fea392ccc02" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_ExternalInvestmentManagerMember_019e2207-0b5f-76ae-afb0-4ce70ea3d517" xlink:href="main-20260630.xsd#main_ExternalInvestmentManagerMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019e2207-0b5f-7f80-bdd7-1fea392ccc02" xlink:to="loc_main_ExternalInvestmentManagerMember_019e2207-0b5f-76ae-afb0-4ce70ea3d517" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019e2207-0b5f-7b9c-9806-c516704f1882" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019e2207-0b5f-7dbc-b060-56542bf9cf5f" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019e2207-0b5f-7b9c-9806-c516704f1882" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019e2207-0b5f-7bca-83f4-9dec31e8ab83" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019e2207-0b5f-7b9c-9806-c516704f1882" xlink:to="loc_us-gaap_RelatedPartyDomain_019e2207-0b5f-7bca-83f4-9dec31e8ab83" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_AffiliatedEntityMember_019e2207-0b5f-7064-ab21-805dfa558197" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_AffiliatedEntityMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RelatedPartyDomain_019e2207-0b5f-7bca-83f4-9dec31e8ab83" xlink:to="loc_srt_AffiliatedEntityMember_019e2207-0b5f-7064-ab21-805dfa558197" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019e2207-0b5f-7e55-b73b-72d763bbc3c1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConcentrationRiskByBenchmarkAxis"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019e2207-0b5f-7dbc-b060-56542bf9cf5f" xlink:to="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019e2207-0b5f-7e55-b73b-72d763bbc3c1" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019e2207-0b5f-746b-a825-f8ad384588b4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019e2207-0b5f-7e55-b73b-72d763bbc3c1" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019e2207-0b5f-746b-a825-f8ad384588b4" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_InvestmentOwnedAtFairValueMember_019e2207-0b5f-76ae-916d-f380093dc786" xlink:href="main-20260630.xsd#main_InvestmentOwnedAtFairValueMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019e2207-0b5f-746b-a825-f8ad384588b4" xlink:to="loc_main_InvestmentOwnedAtFairValueMember_019e2207-0b5f-76ae-916d-f380093dc786" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_InvestmentOwnedAtCostMember_019e2207-0b5f-7b45-950a-f930fa3019d8" xlink:href="main-20260630.xsd#main_InvestmentOwnedAtCostMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019e2207-0b5f-746b-a825-f8ad384588b4" xlink:to="loc_main_InvestmentOwnedAtCostMember_019e2207-0b5f-7b45-950a-f930fa3019d8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByTypeAxis_019e2207-0b5f-79ad-ae82-deee683b1a77" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConcentrationRiskByTypeAxis"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019e2207-0b5f-7dbc-b060-56542bf9cf5f" xlink:to="loc_us-gaap_ConcentrationRiskByTypeAxis_019e2207-0b5f-79ad-ae82-deee683b1a77" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_019e2207-0b5f-7c89-bc52-7c335531797f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_019e2207-0b5f-79ad-ae82-deee683b1a77" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_019e2207-0b5f-7c89-bc52-7c335531797f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_InvestmentTypeConcentrationRiskMember_019e2207-0b5f-753b-8f5b-97648937f8cc" xlink:href="main-20260630.xsd#main_InvestmentTypeConcentrationRiskMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ConcentrationRiskTypeDomain_019e2207-0b5f-7c89-bc52-7c335531797f" xlink:to="loc_main_InvestmentTypeConcentrationRiskMember_019e2207-0b5f-753b-8f5b-97648937f8cc" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019e2207-0b5f-7da2-99d1-b57de836ae5a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019e2207-0b5f-7dbc-b060-56542bf9cf5f" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019e2207-0b5f-7da2-99d1-b57de836ae5a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_InvestmentCompanyNumberOfPortfolioInvestments_019e2207-0b5f-7fba-be64-6ffc7fd14611" xlink:href="main-20260630.xsd#main_InvestmentCompanyNumberOfPortfolioInvestments"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019e2207-0b5f-7da2-99d1-b57de836ae5a" xlink:to="loc_main_InvestmentCompanyNumberOfPortfolioInvestments_019e2207-0b5f-7fba-be64-6ffc7fd14611" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_InvestmentsAnnualRevenuesPerCompany_019e2207-0b5f-70a8-a653-c02bd4c566df" xlink:href="main-20260630.xsd#main_InvestmentsAnnualRevenuesPerCompany"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019e2207-0b5f-7da2-99d1-b57de836ae5a" xlink:to="loc_main_InvestmentsAnnualRevenuesPerCompany_019e2207-0b5f-70a8-a653-c02bd4c566df" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_InvestmentsPerCompany_019e2207-0b5f-7b10-b424-f36383bf35c3" xlink:href="main-20260630.xsd#main_InvestmentsPerCompany"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019e2207-0b5f-7da2-99d1-b57de836ae5a" xlink:to="loc_main_InvestmentsPerCompany_019e2207-0b5f-7b10-b424-f36383bf35c3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_InvestmentTerm_019e2207-0b5f-761d-ac93-4a59d1c63b00" xlink:href="main-20260630.xsd#main_InvestmentTerm"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019e2207-0b5f-7da2-99d1-b57de836ae5a" xlink:to="loc_main_InvestmentTerm_019e2207-0b5f-761d-ac93-4a59d1c63b00" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentCompanyExpenseOffsetArrangement_019e2207-0b5f-7dd2-ad91-c7ef5f49a6d3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentCompanyExpenseOffsetArrangement"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019e2207-0b5f-7da2-99d1-b57de836ae5a" xlink:to="loc_us-gaap_InvestmentCompanyExpenseOffsetArrangement_019e2207-0b5f-7dd2-ad91-c7ef5f49a6d3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_InvestmentCompanyNumberOfPortfolioInvestmentsEntities_019e2207-0b5f-7a35-8bad-6ffae5a0783c" xlink:href="main-20260630.xsd#main_InvestmentCompanyNumberOfPortfolioInvestmentsEntities"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019e2207-0b5f-7da2-99d1-b57de836ae5a" xlink:to="loc_main_InvestmentCompanyNumberOfPortfolioInvestmentsEntities_019e2207-0b5f-7a35-8bad-6ffae5a0783c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_InvestmentCompanyNumberOfPortfolioInvestmentsInvestmentManagers_019e2207-0b5f-7a62-98f3-161ec9253ab8" xlink:href="main-20260630.xsd#main_InvestmentCompanyNumberOfPortfolioInvestmentsInvestmentManagers"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019e2207-0b5f-7da2-99d1-b57de836ae5a" xlink:to="loc_main_InvestmentCompanyNumberOfPortfolioInvestmentsInvestmentManagers_019e2207-0b5f-7a62-98f3-161ec9253ab8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentOwnedAtFairValue_019e2207-0b5f-7301-977b-7e5463933f4e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentOwnedAtFairValue"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019e2207-0b5f-7da2-99d1-b57de836ae5a" xlink:to="loc_us-gaap_InvestmentOwnedAtFairValue_019e2207-0b5f-7301-977b-7e5463933f4e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentOwnedAtCost_019e2207-0b5f-7e97-adbe-9851bffd54aa" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentOwnedAtCost"/>
    <link:presentationArc order="9" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019e2207-0b5f-7da2-99d1-b57de836ae5a" xlink:to="loc_us-gaap_InvestmentOwnedAtCost_019e2207-0b5f-7e97-adbe-9851bffd54aa" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskPercentage1_019e2207-0b5f-7d94-a52b-a62a0eb783d5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConcentrationRiskPercentage1"/>
    <link:presentationArc order="10" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019e2207-0b5f-7da2-99d1-b57de836ae5a" xlink:to="loc_us-gaap_ConcentrationRiskPercentage1_019e2207-0b5f-7d94-a52b-a62a0eb783d5" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_InvestmentCompanyNumberOfPortfolioCompanies_019e2207-0b5f-7e14-9a2b-653e887a0891" xlink:href="main-20260630.xsd#main_InvestmentCompanyNumberOfPortfolioCompanies"/>
    <link:presentationArc order="11" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019e2207-0b5f-7da2-99d1-b57de836ae5a" xlink:to="loc_main_InvestmentCompanyNumberOfPortfolioCompanies_019e2207-0b5f-7e14-9a2b-653e887a0891" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_InvestmentCompanyAnnualizedTotalReturn_019e2207-0b5f-7535-bd38-0a941b7c6d3a" xlink:href="main-20260630.xsd#main_InvestmentCompanyAnnualizedTotalReturn"/>
    <link:presentationArc order="12" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019e2207-0b5f-7da2-99d1-b57de836ae5a" xlink:to="loc_main_InvestmentCompanyAnnualizedTotalReturn_019e2207-0b5f-7535-bd38-0a941b7c6d3a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_InvestmentCompanyAchievedTotalReturn_019e2207-0b5f-7fc7-bb73-9831828c3498" xlink:href="main-20260630.xsd#main_InvestmentCompanyAchievedTotalReturn"/>
    <link:presentationArc order="13" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019e2207-0b5f-7da2-99d1-b57de836ae5a" xlink:to="loc_main_InvestmentCompanyAchievedTotalReturn_019e2207-0b5f-7fc7-bb73-9831828c3498" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.mainstcapital.com/role/FAIRVALUEHIERARCHYFORINVESTMENTSPORTFOLIOCOMPOSITIONScheduleofLevel3PortfolioInvestmentsDetails" xlink:type="simple" xlink:href="main-20260630.xsd#FAIRVALUEHIERARCHYFORINVESTMENTSPORTFOLIOCOMPOSITIONScheduleofLevel3PortfolioInvestmentsDetails"/>
  <link:presentationLink xlink:role="http://www.mainstcapital.com/role/FAIRVALUEHIERARCHYFORINVESTMENTSPORTFOLIOCOMPOSITIONScheduleofLevel3PortfolioInvestmentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueDisclosuresAbstract_019e2207-0b5f-7723-a8cf-0287eccbe68e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueDisclosuresAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_019e2207-0b5f-704f-8d76-cfcbe9e58b9f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueDisclosuresAbstract_019e2207-0b5f-7723-a8cf-0287eccbe68e" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_019e2207-0b5f-704f-8d76-cfcbe9e58b9f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e2207-0b5f-7fd7-9b18-991c6fd455a2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_019e2207-0b5f-704f-8d76-cfcbe9e58b9f" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e2207-0b5f-7fd7-9b18-991c6fd455a2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e2207-0b5f-7aa1-863d-3628c8a7a1fa" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e2207-0b5f-7fd7-9b18-991c6fd455a2" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e2207-0b5f-7aa1-863d-3628c8a7a1fa" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_019e2207-0b5f-7b35-b541-66cdc2deedfe" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e2207-0b5f-7aa1-863d-3628c8a7a1fa" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_019e2207-0b5f-7b35-b541-66cdc2deedfe" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019e2207-0b5f-73b6-a1e1-fb06b7fc2e70" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_019e2207-0b5f-704f-8d76-cfcbe9e58b9f" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019e2207-0b5f-73b6-a1e1-fb06b7fc2e70" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e2207-0b5f-7bb9-a302-fbb3276c92e2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019e2207-0b5f-73b6-a1e1-fb06b7fc2e70" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e2207-0b5f-7bb9-a302-fbb3276c92e2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesMember_019e2207-0b5f-7505-bf22-be147f2a525c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquitySecuritiesMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e2207-0b5f-7bb9-a302-fbb3276c92e2" xlink:to="loc_us-gaap_EquitySecuritiesMember_019e2207-0b5f-7505-bf22-be147f2a525c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesMember_019e2207-0b5f-7b45-9ec7-998008a53a56" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e2207-0b5f-7bb9-a302-fbb3276c92e2" xlink:to="loc_us-gaap_DebtSecuritiesMember_019e2207-0b5f-7b45-9ec7-998008a53a56" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/netLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueAxis_019e2207-0b5f-7e88-b09a-9a99335428c7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ValuationTechniqueAxis"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_019e2207-0b5f-704f-8d76-cfcbe9e58b9f" xlink:to="loc_us-gaap_ValuationTechniqueAxis_019e2207-0b5f-7e88-b09a-9a99335428c7" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueDomain_019e2207-0b5f-752b-bb65-cbfce21d9d16" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ValuationTechniqueDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ValuationTechniqueAxis_019e2207-0b5f-7e88-b09a-9a99335428c7" xlink:to="loc_us-gaap_ValuationTechniqueDomain_019e2207-0b5f-752b-bb65-cbfce21d9d16" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueDiscountedCashFlowMember_019e2207-0b5f-74f5-9ab1-0974c4f3cdd5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ValuationTechniqueDiscountedCashFlowMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ValuationTechniqueDomain_019e2207-0b5f-752b-bb65-cbfce21d9d16" xlink:to="loc_us-gaap_ValuationTechniqueDiscountedCashFlowMember_019e2207-0b5f-74f5-9ab1-0974c4f3cdd5" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_ValuationMarketAndEnterpriseValueApproachMember_019e2207-0b5f-7389-80ed-d7d85dfa3805" xlink:href="main-20260630.xsd#main_ValuationMarketAndEnterpriseValueApproachMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ValuationTechniqueDomain_019e2207-0b5f-752b-bb65-cbfce21d9d16" xlink:to="loc_main_ValuationMarketAndEnterpriseValueApproachMember_019e2207-0b5f-7389-80ed-d7d85dfa3805" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketApproachValuationTechniqueMember_019e2207-0b5f-7478-a2a8-ffa87961ad58" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MarketApproachValuationTechniqueMember"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ValuationTechniqueDomain_019e2207-0b5f-752b-bb65-cbfce21d9d16" xlink:to="loc_us-gaap_MarketApproachValuationTechniqueMember_019e2207-0b5f-7478-a2a8-ffa87961ad58" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeAxis_019e2207-0b5f-79d5-8b16-67886d67530f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MeasurementInputTypeAxis"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_019e2207-0b5f-704f-8d76-cfcbe9e58b9f" xlink:to="loc_us-gaap_MeasurementInputTypeAxis_019e2207-0b5f-79d5-8b16-67886d67530f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_019e2207-0b5f-71ea-af80-2e15ab273b3f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MeasurementInputTypeDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_MeasurementInputTypeAxis_019e2207-0b5f-79d5-8b16-67886d67530f" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_019e2207-0b5f-71ea-af80-2e15ab273b3f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_MeasurementInputWeightedAverageCostOfCapitalMember_019e2207-0b5f-7b2b-8370-242d7a3fb16a" xlink:href="main-20260630.xsd#main_MeasurementInputWeightedAverageCostOfCapitalMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_019e2207-0b5f-71ea-af80-2e15ab273b3f" xlink:to="loc_main_MeasurementInputWeightedAverageCostOfCapitalMember_019e2207-0b5f-7b2b-8370-242d7a3fb16a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputEbitdaMultipleMember_019e2207-0b5f-7dc4-9259-5be39ddddd5a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MeasurementInputEbitdaMultipleMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_019e2207-0b5f-71ea-af80-2e15ab273b3f" xlink:to="loc_us-gaap_MeasurementInputEbitdaMultipleMember_019e2207-0b5f-7dc4-9259-5be39ddddd5a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_MeasurementInputEBITDAMultipleOutlierMember_019e2207-0b5f-7118-96d9-388f3b1b994d" xlink:href="main-20260630.xsd#main_MeasurementInputEBITDAMultipleOutlierMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_MeasurementInputEbitdaMultipleMember_019e2207-0b5f-7dc4-9259-5be39ddddd5a" xlink:to="loc_main_MeasurementInputEBITDAMultipleOutlierMember_019e2207-0b5f-7118-96d9-388f3b1b994d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_MeasurementInputRiskAdjustedDiscountRateMember_019e2207-0b5f-7934-802e-2b66f1c67f7f" xlink:href="main-20260630.xsd#main_MeasurementInputRiskAdjustedDiscountRateMember"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_019e2207-0b5f-71ea-af80-2e15ab273b3f" xlink:to="loc_main_MeasurementInputRiskAdjustedDiscountRateMember_019e2207-0b5f-7934-802e-2b66f1c67f7f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_MeasurementInputRiskAdjustedDiscountRateOutlierMember_019e2207-0b5f-7261-808e-4e24b842cca9" xlink:href="main-20260630.xsd#main_MeasurementInputRiskAdjustedDiscountRateOutlierMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_main_MeasurementInputRiskAdjustedDiscountRateMember_019e2207-0b5f-7934-802e-2b66f1c67f7f" xlink:to="loc_main_MeasurementInputRiskAdjustedDiscountRateOutlierMember_019e2207-0b5f-7261-808e-4e24b842cca9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_MeasurementInputExpectedPrincipalRecoveryPercentageMember_019e2207-0b5f-7b63-9ef2-d8d82a64226f" xlink:href="main-20260630.xsd#main_MeasurementInputExpectedPrincipalRecoveryPercentageMember"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_019e2207-0b5f-71ea-af80-2e15ab273b3f" xlink:to="loc_main_MeasurementInputExpectedPrincipalRecoveryPercentageMember_019e2207-0b5f-7b63-9ef2-d8d82a64226f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_MeasurementInputThirdPartyQuoteMember_019e2207-0b5f-7b79-a9e9-a75bfdbe4489" xlink:href="main-20260630.xsd#main_MeasurementInputThirdPartyQuoteMember"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_019e2207-0b5f-71ea-af80-2e15ab273b3f" xlink:to="loc_main_MeasurementInputThirdPartyQuoteMember_019e2207-0b5f-7b79-a9e9-a75bfdbe4489" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_MeasurementInputFeeMultipleMember_019e2207-0b5f-7b9c-a993-2997c0938395" xlink:href="main-20260630.xsd#main_MeasurementInputFeeMultipleMember"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_019e2207-0b5f-71ea-af80-2e15ab273b3f" xlink:to="loc_main_MeasurementInputFeeMultipleMember_019e2207-0b5f-7b9c-a993-2997c0938395" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019e2207-0b5f-75d5-8be7-9fd3804171de" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeAxis"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_019e2207-0b5f-704f-8d76-cfcbe9e58b9f" xlink:to="loc_srt_RangeAxis_019e2207-0b5f-75d5-8be7-9fd3804171de" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019e2207-0b5f-7579-b1b2-66d919cab244" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeAxis_019e2207-0b5f-75d5-8be7-9fd3804171de" xlink:to="loc_srt_RangeMember_019e2207-0b5f-7579-b1b2-66d919cab244" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019e2207-0b5f-7af6-b126-cdcb292e692a" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MinimumMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeMember_019e2207-0b5f-7579-b1b2-66d919cab244" xlink:to="loc_srt_MinimumMember_019e2207-0b5f-7af6-b126-cdcb292e692a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019e2207-0b5f-7d77-b7e8-b2738d102587" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MaximumMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeMember_019e2207-0b5f-7579-b1b2-66d919cab244" xlink:to="loc_srt_MaximumMember_019e2207-0b5f-7d77-b7e8-b2738d102587" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_WeightedAverageMember_019e2207-0b5f-77e9-9014-df45daf8e3a0" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_WeightedAverageMember"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeMember_019e2207-0b5f-7579-b1b2-66d919cab244" xlink:to="loc_srt_WeightedAverageMember_019e2207-0b5f-77e9-9014-df45daf8e3a0" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MedianMember_019e2207-0b5f-7409-b8f0-233c765a305a" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MedianMember"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeMember_019e2207-0b5f-7579-b1b2-66d919cab244" xlink:to="loc_srt_MedianMember_019e2207-0b5f-7409-b8f0-233c765a305a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CounterpartyNameAxis_019e2207-0b5f-78ea-a824-178c3e7ac2b4" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_CounterpartyNameAxis"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_019e2207-0b5f-704f-8d76-cfcbe9e58b9f" xlink:to="loc_srt_CounterpartyNameAxis_019e2207-0b5f-78ea-a824-178c3e7ac2b4" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019e2207-0b5f-7b2e-a0e9-ccfd6eba9eeb" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_CounterpartyNameAxis_019e2207-0b5f-78ea-a824-178c3e7ac2b4" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019e2207-0b5f-7b2e-a0e9-ccfd6eba9eeb" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_ExternalInvestmentManagerMember_019e2207-0b5f-7b3d-ab02-b5293672cee4" xlink:href="main-20260630.xsd#main_ExternalInvestmentManagerMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019e2207-0b5f-7b2e-a0e9-ccfd6eba9eeb" xlink:to="loc_main_ExternalInvestmentManagerMember_019e2207-0b5f-7b3d-ab02-b5293672cee4" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019e2207-0b5f-7fa8-9b89-2effde9fafee" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_019e2207-0b5f-704f-8d76-cfcbe9e58b9f" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019e2207-0b5f-7fa8-9b89-2effde9fafee" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019e2207-0b5f-7228-82dc-c4edfabf64dd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019e2207-0b5f-7fa8-9b89-2effde9fafee" xlink:to="loc_us-gaap_RelatedPartyDomain_019e2207-0b5f-7228-82dc-c4edfabf64dd" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyMember_019e2207-0b5f-7606-9934-6cd77b166314" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RelatedPartyDomain_019e2207-0b5f-7228-82dc-c4edfabf64dd" xlink:to="loc_us-gaap_RelatedPartyMember_019e2207-0b5f-7606-9934-6cd77b166314" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_019e2207-0b5f-7cba-a1d3-d70b25eef186" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_019e2207-0b5f-704f-8d76-cfcbe9e58b9f" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_019e2207-0b5f-7cba-a1d3-d70b25eef186" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentOwnedAtFairValue_019e2207-0b5f-702d-a804-8973c4dcb139" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentOwnedAtFairValue"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_019e2207-0b5f-7cba-a1d3-d70b25eef186" xlink:to="loc_us-gaap_InvestmentOwnedAtFairValue_019e2207-0b5f-702d-a804-8973c4dcb139" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/netLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentCompanyInvestmentOwnedFairValueMeasurementInput_019e2207-0b5f-775b-882d-37ef8190b14d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentCompanyInvestmentOwnedFairValueMeasurementInput"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_019e2207-0b5f-7cba-a1d3-d70b25eef186" xlink:to="loc_us-gaap_InvestmentCompanyInvestmentOwnedFairValueMeasurementInput_019e2207-0b5f-775b-882d-37ef8190b14d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.mainstcapital.com/role/FAIRVALUEHIERARCHYFORINVESTMENTSPORTFOLIOCOMPOSITIONScheduleofChangesinFairValueofLevel3PortfolioInvestmentsDetails" xlink:type="simple" xlink:href="main-20260630.xsd#FAIRVALUEHIERARCHYFORINVESTMENTSPORTFOLIOCOMPOSITIONScheduleofChangesinFairValueofLevel3PortfolioInvestmentsDetails"/>
  <link:presentationLink xlink:role="http://www.mainstcapital.com/role/FAIRVALUEHIERARCHYFORINVESTMENTSPORTFOLIOCOMPOSITIONScheduleofChangesinFairValueofLevel3PortfolioInvestmentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueDisclosuresAbstract_019e2207-0b5f-708f-8db9-c00381c48c89" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueDisclosuresAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_019e2207-0b5f-7b0e-a9a2-ee11a64e53f1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueDisclosuresAbstract_019e2207-0b5f-708f-8db9-c00381c48c89" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_019e2207-0b5f-7b0e-a9a2-ee11a64e53f1" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByAssetClassAxis_019e2207-0b5f-7d3e-9415-f24ef8c0fedb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByAssetClassAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_019e2207-0b5f-7b0e-a9a2-ee11a64e53f1" xlink:to="loc_us-gaap_FairValueByAssetClassAxis_019e2207-0b5f-7d3e-9415-f24ef8c0fedb" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019e2207-0b5f-7c07-8d2d-0b66497db60c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_019e2207-0b5f-7d3e-9415-f24ef8c0fedb" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019e2207-0b5f-7c07-8d2d-0b66497db60c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentsMember_019e2207-0b5f-7ce7-ad67-be209b135ae6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentsMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019e2207-0b5f-7c07-8d2d-0b66497db60c" xlink:to="loc_us-gaap_InvestmentsMember_019e2207-0b5f-7ce7-ad67-be209b135ae6" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesMember_019e2207-0b5f-70d0-932e-363cd7657022" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentsMember_019e2207-0b5f-7ce7-ad67-be209b135ae6" xlink:to="loc_us-gaap_DebtSecuritiesMember_019e2207-0b5f-70d0-932e-363cd7657022" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesMember_019e2207-0b5f-770b-9dc2-8ff79c344fc9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquitySecuritiesMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentsMember_019e2207-0b5f-7ce7-ad67-be209b135ae6" xlink:to="loc_us-gaap_EquitySecuritiesMember_019e2207-0b5f-770b-9dc2-8ff79c344fc9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_EquityWarrantMember_019e2207-0b5f-78b0-83e8-2a73e6eb2429" xlink:href="main-20260630.xsd#main_EquityWarrantMember"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentsMember_019e2207-0b5f-7ce7-ad67-be209b135ae6" xlink:to="loc_main_EquityWarrantMember_019e2207-0b5f-78b0-83e8-2a73e6eb2429" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementOfIncomeLocationBalanceAxis_019e2207-0b5f-74cb-acc1-6f5f4c0c35a3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementOfIncomeLocationBalanceAxis"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_019e2207-0b5f-7b0e-a9a2-ee11a64e53f1" xlink:to="loc_us-gaap_StatementOfIncomeLocationBalanceAxis_019e2207-0b5f-74cb-acc1-6f5f4c0c35a3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_019e2207-0b5f-72a6-9146-bb07d783563c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_019e2207-0b5f-7b0e-a9a2-ee11a64e53f1" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_019e2207-0b5f-72a6-9146-bb07d783563c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019e2207-0b5f-772c-a401-e8619c1779c8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_019e2207-0b5f-72a6-9146-bb07d783563c" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019e2207-0b5f-772c-a401-e8619c1779c8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue_019e2207-0b5f-7e2c-8f51-e79a27b2896f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019e2207-0b5f-772c-a401-e8619c1779c8" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue_019e2207-0b5f-7e2c-8f51-e79a27b2896f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/periodStartLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet_019e2207-0b5f-7c07-a3b3-565fe5670098" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019e2207-0b5f-772c-a401-e8619c1779c8" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet_019e2207-0b5f-7c07-a3b3-565fe5670098" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements_019e2207-0b5f-7f01-947a-49539610ed11" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019e2207-0b5f-772c-a401-e8619c1779c8" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements_019e2207-0b5f-7f01-947a-49539610ed11" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases_019e2207-0b5f-7735-b137-184f1e19a7d7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019e2207-0b5f-772c-a401-e8619c1779c8" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases_019e2207-0b5f-7735-b137-184f1e19a7d7" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1_019e2207-0b5f-7a4b-9a18-d93ed23cba89" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019e2207-0b5f-772c-a401-e8619c1779c8" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1_019e2207-0b5f-7a4b-9a18-d93ed23cba89" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetOther_019e2207-0b5f-727f-9dc8-a718b8d5885a" xlink:href="main-20260630.xsd#main_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetOther"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019e2207-0b5f-772c-a401-e8619c1779c8" xlink:to="loc_main_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetOther_019e2207-0b5f-727f-9dc8-a718b8d5885a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue_019e2207-0b5f-7d42-a9fa-c076bce8fbdd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019e2207-0b5f-772c-a401-e8619c1779c8" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue_019e2207-0b5f-7d42-a9fa-c076bce8fbdd" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/periodEndLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss_019eb699-d432-79c2-8c4e-e68f9b77a4f2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_019e2207-0b5f-72a6-9146-bb07d783563c" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss_019eb699-d432-79c2-8c4e-e68f9b77a4f2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.mainstcapital.com/role/FAIRVALUEHIERARCHYFORINVESTMENTSPORTFOLIOCOMPOSITIONScheduleofFairValueHierarchyDetails" xlink:type="simple" xlink:href="main-20260630.xsd#FAIRVALUEHIERARCHYFORINVESTMENTSPORTFOLIOCOMPOSITIONScheduleofFairValueHierarchyDetails"/>
  <link:presentationLink xlink:role="http://www.mainstcapital.com/role/FAIRVALUEHIERARCHYFORINVESTMENTSPORTFOLIOCOMPOSITIONScheduleofFairValueHierarchyDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueDisclosuresAbstract_019e2207-0b5f-72e4-8074-0992495b7490" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueDisclosuresAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByBalanceSheetGroupingTable_019e2207-0b5f-7296-8d79-c8ba45c6cc04" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByBalanceSheetGroupingTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueDisclosuresAbstract_019e2207-0b5f-72e4-8074-0992495b7490" xlink:to="loc_us-gaap_FairValueByBalanceSheetGroupingTable_019e2207-0b5f-7296-8d79-c8ba45c6cc04" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019e2207-0b5f-7028-b991-191ee029e120" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByMeasurementFrequencyAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_019e2207-0b5f-7296-8d79-c8ba45c6cc04" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019e2207-0b5f-7028-b991-191ee029e120" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_019e2207-0b5f-7661-bf81-0f709f6cfd7c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019e2207-0b5f-7028-b991-191ee029e120" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_019e2207-0b5f-7661-bf81-0f709f6cfd7c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsRecurringMember_019e2207-0b5f-7339-81f8-18be1d7eb93e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsRecurringMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_019e2207-0b5f-7661-bf81-0f709f6cfd7c" xlink:to="loc_us-gaap_FairValueMeasurementsRecurringMember_019e2207-0b5f-7339-81f8-18be1d7eb93e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019e2207-0b5f-7d02-af60-cc4a67685b92" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_019e2207-0b5f-7296-8d79-c8ba45c6cc04" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019e2207-0b5f-7d02-af60-cc4a67685b92" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e2207-0b5f-7664-9d21-ffd10e54254b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019e2207-0b5f-7d02-af60-cc4a67685b92" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e2207-0b5f-7664-9d21-ffd10e54254b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_LowerMiddleMarketPortfolioMember_019e2207-0b5f-7d7b-a11e-454950779620" xlink:href="main-20260630.xsd#main_LowerMiddleMarketPortfolioMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e2207-0b5f-7664-9d21-ffd10e54254b" xlink:to="loc_main_LowerMiddleMarketPortfolioMember_019e2207-0b5f-7d7b-a11e-454950779620" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_PrivateLoanPortfolioMember_019e2207-0b5f-7c01-9822-51c44d0ff623" xlink:href="main-20260630.xsd#main_PrivateLoanPortfolioMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e2207-0b5f-7664-9d21-ffd10e54254b" xlink:to="loc_main_PrivateLoanPortfolioMember_019e2207-0b5f-7c01-9822-51c44d0ff623" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_MiddleMarketPortfolioMember_019e2207-0b5f-7ee3-9294-4a79a5bf9d75" xlink:href="main-20260630.xsd#main_MiddleMarketPortfolioMember"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e2207-0b5f-7664-9d21-ffd10e54254b" xlink:to="loc_main_MiddleMarketPortfolioMember_019e2207-0b5f-7ee3-9294-4a79a5bf9d75" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAggregatedInvestmentsMember_019e2207-0b5f-7894-a8c0-985484d59472" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherAggregatedInvestmentsMember"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e2207-0b5f-7664-9d21-ffd10e54254b" xlink:to="loc_us-gaap_OtherAggregatedInvestmentsMember_019e2207-0b5f-7894-a8c0-985484d59472" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_ExternalInvestmentManagerInvestmentsMember_019e2207-0b5f-7d46-885a-ff358cc16aa0" xlink:href="main-20260630.xsd#main_ExternalInvestmentManagerInvestmentsMember"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e2207-0b5f-7664-9d21-ffd10e54254b" xlink:to="loc_main_ExternalInvestmentManagerInvestmentsMember_019e2207-0b5f-7d46-885a-ff358cc16aa0" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e2207-0b5f-7b40-92d7-ea0dc42bf204" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_019e2207-0b5f-7296-8d79-c8ba45c6cc04" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e2207-0b5f-7b40-92d7-ea0dc42bf204" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e2207-0b5f-7d4b-8412-4ce9f2481bb2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e2207-0b5f-7b40-92d7-ea0dc42bf204" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e2207-0b5f-7d4b-8412-4ce9f2481bb2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_019e2207-0b5f-7d37-bcab-0c8c7de933da" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e2207-0b5f-7d4b-8412-4ce9f2481bb2" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_019e2207-0b5f-7d37-bcab-0c8c7de933da" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_019e2207-0b5f-7a6e-8edc-8e6a17c97b35" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e2207-0b5f-7d4b-8412-4ce9f2481bb2" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_019e2207-0b5f-7a6e-8edc-8e6a17c97b35" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_019e2207-0b5f-7bd1-b899-72c01f75561d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e2207-0b5f-7d4b-8412-4ce9f2481bb2" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_019e2207-0b5f-7bd1-b899-72c01f75561d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_019e2207-0b5f-739c-b46d-e856ba393de0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_019e2207-0b5f-7296-8d79-c8ba45c6cc04" xlink:to="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_019e2207-0b5f-739c-b46d-e856ba393de0" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentOwnedAtFairValue_019e2207-0b5f-708d-b63c-3b284500caaf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentOwnedAtFairValue"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_019e2207-0b5f-739c-b46d-e856ba393de0" xlink:to="loc_us-gaap_InvestmentOwnedAtFairValue_019e2207-0b5f-708d-b63c-3b284500caaf" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.mainstcapital.com/role/FAIRVALUEHIERARCHYFORINVESTMENTSPORTFOLIOCOMPOSITIONScheduleofInvestmentsDetails" xlink:type="simple" xlink:href="main-20260630.xsd#FAIRVALUEHIERARCHYFORINVESTMENTSPORTFOLIOCOMPOSITIONScheduleofInvestmentsDetails"/>
  <link:presentationLink xlink:role="http://www.mainstcapital.com/role/FAIRVALUEHIERARCHYFORINVESTMENTSPORTFOLIOCOMPOSITIONScheduleofInvestmentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueDisclosuresAbstract_019e2207-0b5f-79f4-abfe-8c386da251ef" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueDisclosuresAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SummaryOfInvestmentHoldingsTable_019e2207-0b5f-79da-bc01-6377153b972e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SummaryOfInvestmentHoldingsTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueDisclosuresAbstract_019e2207-0b5f-79f4-abfe-8c386da251ef" xlink:to="loc_us-gaap_SummaryOfInvestmentHoldingsTable_019e2207-0b5f-79da-bc01-6377153b972e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeAxis_019e2207-0b60-7923-9ff6-cfebc7919320" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentTypeAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SummaryOfInvestmentHoldingsTable_019e2207-0b5f-79da-bc01-6377153b972e" xlink:to="loc_us-gaap_InvestmentTypeAxis_019e2207-0b60-7923-9ff6-cfebc7919320" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_019e2207-0b60-7284-8979-fcd92fef21ea" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentTypeAxis_019e2207-0b60-7923-9ff6-cfebc7919320" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_019e2207-0b60-7284-8979-fcd92fef21ea" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_LowerMiddleMarketPortfolioMember_019e2207-0b60-74be-8ac4-91cd8dac9bdd" xlink:href="main-20260630.xsd#main_LowerMiddleMarketPortfolioMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019e2207-0b60-7284-8979-fcd92fef21ea" xlink:to="loc_main_LowerMiddleMarketPortfolioMember_019e2207-0b60-74be-8ac4-91cd8dac9bdd" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_PrivateLoanPortfolioMember_019e2207-0b60-7613-93c6-530ffdb45051" xlink:href="main-20260630.xsd#main_PrivateLoanPortfolioMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019e2207-0b60-7284-8979-fcd92fef21ea" xlink:to="loc_main_PrivateLoanPortfolioMember_019e2207-0b60-7613-93c6-530ffdb45051" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019e2207-0b60-7c67-8975-867423d61243" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SummaryOfInvestmentHoldingsTable_019e2207-0b5f-79da-bc01-6377153b972e" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019e2207-0b60-7c67-8975-867423d61243" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e2207-0b60-7805-a6e9-ed23fc585c4f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019e2207-0b60-7c67-8975-867423d61243" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e2207-0b60-7805-a6e9-ed23fc585c4f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesMember_019e2207-0b60-7609-8b0a-775238cc5e36" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e2207-0b60-7805-a6e9-ed23fc585c4f" xlink:to="loc_us-gaap_DebtSecuritiesMember_019e2207-0b60-7609-8b0a-775238cc5e36" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesMember_019e2207-0b60-781e-aa7d-16e177df7824" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquitySecuritiesMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e2207-0b60-7805-a6e9-ed23fc585c4f" xlink:to="loc_us-gaap_EquitySecuritiesMember_019e2207-0b60-781e-aa7d-16e177df7824" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_DebtSecuritiesFirstLienMember_019e2207-0b60-7bfd-b460-073ebaad7489" xlink:href="main-20260630.xsd#main_DebtSecuritiesFirstLienMember"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e2207-0b60-7805-a6e9-ed23fc585c4f" xlink:to="loc_main_DebtSecuritiesFirstLienMember_019e2207-0b60-7bfd-b460-073ebaad7489" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019e2207-0b60-7750-9c88-55b6c5fe37e9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConcentrationRiskByBenchmarkAxis"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SummaryOfInvestmentHoldingsTable_019e2207-0b5f-79da-bc01-6377153b972e" xlink:to="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019e2207-0b60-7750-9c88-55b6c5fe37e9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019e2207-0b60-7e97-9eea-3f9df06ce0b1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019e2207-0b60-7750-9c88-55b6c5fe37e9" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019e2207-0b60-7e97-9eea-3f9df06ce0b1" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_InvestmentOwnedAtCostMember_019e2207-0b60-7115-849d-6c7e15c215d5" xlink:href="main-20260630.xsd#main_InvestmentOwnedAtCostMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019e2207-0b60-7e97-9eea-3f9df06ce0b1" xlink:to="loc_main_InvestmentOwnedAtCostMember_019e2207-0b60-7115-849d-6c7e15c215d5" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByTypeAxis_019e2207-0b60-7f29-b4e4-4f0b47a28f58" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConcentrationRiskByTypeAxis"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SummaryOfInvestmentHoldingsTable_019e2207-0b5f-79da-bc01-6377153b972e" xlink:to="loc_us-gaap_ConcentrationRiskByTypeAxis_019e2207-0b60-7f29-b4e4-4f0b47a28f58" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_019e2207-0b60-7d12-a786-252aaf5a0bd9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_019e2207-0b60-7f29-b4e4-4f0b47a28f58" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_019e2207-0b60-7d12-a786-252aaf5a0bd9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_InvestmentTypeConcentrationRiskMember_019e2207-0b60-7703-b6a3-3f83cfb8976d" xlink:href="main-20260630.xsd#main_InvestmentTypeConcentrationRiskMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ConcentrationRiskTypeDomain_019e2207-0b60-7d12-a786-252aaf5a0bd9" xlink:to="loc_main_InvestmentTypeConcentrationRiskMember_019e2207-0b60-7703-b6a3-3f83cfb8976d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentPerformanceStatusAxis_019e2207-0b60-796d-bf39-df7edd21777f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialInstrumentPerformanceStatusAxis"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SummaryOfInvestmentHoldingsTable_019e2207-0b5f-79da-bc01-6377153b972e" xlink:to="loc_us-gaap_FinancialInstrumentPerformanceStatusAxis_019e2207-0b60-796d-bf39-df7edd21777f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentPerformanceStatusDomain_019e2207-0b60-7d5c-a93f-afc0a09319a4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialInstrumentPerformanceStatusDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FinancialInstrumentPerformanceStatusAxis_019e2207-0b60-796d-bf39-df7edd21777f" xlink:to="loc_us-gaap_FinancialInstrumentPerformanceStatusDomain_019e2207-0b60-7d5c-a93f-afc0a09319a4" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonperformingFinancingReceivableMember_019e2207-0b60-715a-abf2-8a73d03901d3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NonperformingFinancingReceivableMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FinancialInstrumentPerformanceStatusDomain_019e2207-0b60-7d5c-a93f-afc0a09319a4" xlink:to="loc_us-gaap_NonperformingFinancingReceivableMember_019e2207-0b60-715a-abf2-8a73d03901d3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SummaryOfInvestmentHoldingsLineItems_019e2207-0b60-7b7e-bbeb-d7ce098ea3f4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SummaryOfInvestmentHoldingsLineItems"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SummaryOfInvestmentHoldingsTable_019e2207-0b5f-79da-bc01-6377153b972e" xlink:to="loc_us-gaap_SummaryOfInvestmentHoldingsLineItems_019e2207-0b60-7b7e-bbeb-d7ce098ea3f4" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_InvestmentCompanyNumberOfPortfolioCompanies_019e2207-0b60-7564-9bfc-01ec39129c61" xlink:href="main-20260630.xsd#main_InvestmentCompanyNumberOfPortfolioCompanies"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SummaryOfInvestmentHoldingsLineItems_019e2207-0b60-7b7e-bbeb-d7ce098ea3f4" xlink:to="loc_main_InvestmentCompanyNumberOfPortfolioCompanies_019e2207-0b60-7564-9bfc-01ec39129c61" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentOwnedAtFairValue_019e2207-0b60-7bd2-8850-55600e67509a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentOwnedAtFairValue"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SummaryOfInvestmentHoldingsLineItems_019e2207-0b60-7b7e-bbeb-d7ce098ea3f4" xlink:to="loc_us-gaap_InvestmentOwnedAtFairValue_019e2207-0b60-7bd2-8850-55600e67509a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentOwnedAtCost_019e2207-0b60-7708-9e19-c1154529675e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentOwnedAtCost"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SummaryOfInvestmentHoldingsLineItems_019e2207-0b60-7b7e-bbeb-d7ce098ea3f4" xlink:to="loc_us-gaap_InvestmentOwnedAtCost_019e2207-0b60-7708-9e19-c1154529675e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskPercentage1_019e2207-0b60-7959-a07a-8c46c9e5f4e9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConcentrationRiskPercentage1"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SummaryOfInvestmentHoldingsLineItems_019e2207-0b60-7b7e-bbeb-d7ce098ea3f4" xlink:to="loc_us-gaap_ConcentrationRiskPercentage1_019e2207-0b60-7959-a07a-8c46c9e5f4e9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleWeightedAverageYield_019e2207-0b60-7203-9fc2-ee833e639e8a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleWeightedAverageYield"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SummaryOfInvestmentHoldingsLineItems_019e2207-0b60-7b7e-bbeb-d7ce098ea3f4" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleWeightedAverageYield_019e2207-0b60-7203-9fc2-ee833e639e8a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_InvestmentCompanyAverageEarningsBeforeInterestTaxesDepreciationAndAmortization_019e2207-0b60-782d-9554-b328088b9542" xlink:href="main-20260630.xsd#main_InvestmentCompanyAverageEarningsBeforeInterestTaxesDepreciationAndAmortization"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SummaryOfInvestmentHoldingsLineItems_019e2207-0b60-7b7e-bbeb-d7ce098ea3f4" xlink:to="loc_main_InvestmentCompanyAverageEarningsBeforeInterestTaxesDepreciationAndAmortization_019e2207-0b60-782d-9554-b328088b9542" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_InvestmentCompanyAverageFullyDilutedEquityOwnershipPercentage_019e2207-0b60-754e-b92e-2d84d1b0f938" xlink:href="main-20260630.xsd#main_InvestmentCompanyAverageFullyDilutedEquityOwnershipPercentage"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SummaryOfInvestmentHoldingsLineItems_019e2207-0b60-7b7e-bbeb-d7ce098ea3f4" xlink:to="loc_main_InvestmentCompanyAverageFullyDilutedEquityOwnershipPercentage_019e2207-0b60-754e-b92e-2d84d1b0f938" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_InvestmentCompanyNumberOfCompaniesWithinPortfolioExcludedFromEBITDACalculation_019e2207-0b60-765f-b511-e49d8e58e8dc" xlink:href="main-20260630.xsd#main_InvestmentCompanyNumberOfCompaniesWithinPortfolioExcludedFromEBITDACalculation"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SummaryOfInvestmentHoldingsLineItems_019e2207-0b60-7b7e-bbeb-d7ce098ea3f4" xlink:to="loc_main_InvestmentCompanyNumberOfCompaniesWithinPortfolioExcludedFromEBITDACalculation_019e2207-0b60-765f-b511-e49d8e58e8dc" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.mainstcapital.com/role/FAIRVALUEHIERARCHYFORINVESTMENTSPORTFOLIOCOMPOSITIONScheduleofPercentageofPortfolioInvestmentsbyTypeofInvestmentDetails" xlink:type="simple" xlink:href="main-20260630.xsd#FAIRVALUEHIERARCHYFORINVESTMENTSPORTFOLIOCOMPOSITIONScheduleofPercentageofPortfolioInvestmentsbyTypeofInvestmentDetails"/>
  <link:presentationLink xlink:role="http://www.mainstcapital.com/role/FAIRVALUEHIERARCHYFORINVESTMENTSPORTFOLIOCOMPOSITIONScheduleofPercentageofPortfolioInvestmentsbyTypeofInvestmentDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueDisclosuresAbstract_019e2207-0b60-7f90-a24f-f36c948792ca" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueDisclosuresAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_019e2207-0b60-7ddc-b263-56226ca544ac" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueDisclosuresAbstract_019e2207-0b60-7f90-a24f-f36c948792ca" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_019e2207-0b60-7ddc-b263-56226ca544ac" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByTypeAxis_019e2207-0b60-74e7-b6ee-14a309a9e22e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConcentrationRiskByTypeAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_019e2207-0b60-7ddc-b263-56226ca544ac" xlink:to="loc_us-gaap_ConcentrationRiskByTypeAxis_019e2207-0b60-74e7-b6ee-14a309a9e22e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_019e2207-0b60-798a-9cb9-80645d2af064" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_019e2207-0b60-74e7-b6ee-14a309a9e22e" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_019e2207-0b60-798a-9cb9-80645d2af064" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_InvestmentTypeConcentrationRiskMember_019e2207-0b60-7f8a-89fd-b30ea2de96c4" xlink:href="main-20260630.xsd#main_InvestmentTypeConcentrationRiskMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ConcentrationRiskTypeDomain_019e2207-0b60-798a-9cb9-80645d2af064" xlink:to="loc_main_InvestmentTypeConcentrationRiskMember_019e2207-0b60-7f8a-89fd-b30ea2de96c4" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019e2207-0b60-756e-aba9-a4374823ac2c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConcentrationRiskByBenchmarkAxis"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_019e2207-0b60-7ddc-b263-56226ca544ac" xlink:to="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019e2207-0b60-756e-aba9-a4374823ac2c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019e2207-0b60-79b7-91e9-3a67f2244964" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019e2207-0b60-756e-aba9-a4374823ac2c" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019e2207-0b60-79b7-91e9-3a67f2244964" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_InvestmentOwnedAtCostMember_019e2207-0b60-7e98-b24a-f21620f8e1b9" xlink:href="main-20260630.xsd#main_InvestmentOwnedAtCostMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019e2207-0b60-79b7-91e9-3a67f2244964" xlink:to="loc_main_InvestmentOwnedAtCostMember_019e2207-0b60-7e98-b24a-f21620f8e1b9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_InvestmentOwnedAtFairValueMember_019e2207-0b60-77bd-8805-d7b18c526fd6" xlink:href="main-20260630.xsd#main_InvestmentOwnedAtFairValueMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019e2207-0b60-79b7-91e9-3a67f2244964" xlink:to="loc_main_InvestmentOwnedAtFairValueMember_019e2207-0b60-77bd-8805-d7b18c526fd6" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019e2207-0b60-7524-ac60-43ad45c4f5dc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_019e2207-0b60-7ddc-b263-56226ca544ac" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019e2207-0b60-7524-ac60-43ad45c4f5dc" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e2207-0b60-7f76-bab8-af61db55a1b6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019e2207-0b60-7524-ac60-43ad45c4f5dc" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e2207-0b60-7f76-bab8-af61db55a1b6" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_DebtSecuritiesFirstLienMember_019e2207-0b60-7df6-aff6-5c3e93bce64b" xlink:href="main-20260630.xsd#main_DebtSecuritiesFirstLienMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e2207-0b60-7f76-bab8-af61db55a1b6" xlink:to="loc_main_DebtSecuritiesFirstLienMember_019e2207-0b60-7df6-aff6-5c3e93bce64b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesMember_019e2207-0b60-76a4-a4a0-2732593db914" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquitySecuritiesMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e2207-0b60-7f76-bab8-af61db55a1b6" xlink:to="loc_us-gaap_EquitySecuritiesMember_019e2207-0b60-76a4-a4a0-2732593db914" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_DebtSecuritiesSecondLienMember_019e2207-0b60-7f3f-8636-314fcfde46bf" xlink:href="main-20260630.xsd#main_DebtSecuritiesSecondLienMember"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e2207-0b60-7f76-bab8-af61db55a1b6" xlink:to="loc_main_DebtSecuritiesSecondLienMember_019e2207-0b60-7f3f-8636-314fcfde46bf" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_EquityWarrantMember_019e2207-0b60-71a6-bf62-855ed596d64c" xlink:href="main-20260630.xsd#main_EquityWarrantMember"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e2207-0b60-7f76-bab8-af61db55a1b6" xlink:to="loc_main_EquityWarrantMember_019e2207-0b60-71a6-bf62-855ed596d64c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAggregatedInvestmentsMember_019e2207-0b60-7700-8d70-43e8e24ae4cf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherAggregatedInvestmentsMember"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e2207-0b60-7f76-bab8-af61db55a1b6" xlink:to="loc_us-gaap_OtherAggregatedInvestmentsMember_019e2207-0b60-7700-8d70-43e8e24ae4cf" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_019e2207-0b60-74b2-b8e3-9449433a2653" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_019e2207-0b60-7ddc-b263-56226ca544ac" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_019e2207-0b60-74b2-b8e3-9449433a2653" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskPercentage1_019e2207-0b60-7e0d-a990-26ec50405f45" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConcentrationRiskPercentage1"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_019e2207-0b60-74b2-b8e3-9449433a2653" xlink:to="loc_us-gaap_ConcentrationRiskPercentage1_019e2207-0b60-7e0d-a990-26ec50405f45" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.mainstcapital.com/role/FAIRVALUEHIERARCHYFORINVESTMENTSPORTFOLIOCOMPOSITIONScheduleofPercentageofPortfolioInvestmentsbyGeographicalRegionsDetails" xlink:type="simple" xlink:href="main-20260630.xsd#FAIRVALUEHIERARCHYFORINVESTMENTSPORTFOLIOCOMPOSITIONScheduleofPercentageofPortfolioInvestmentsbyGeographicalRegionsDetails"/>
  <link:presentationLink xlink:role="http://www.mainstcapital.com/role/FAIRVALUEHIERARCHYFORINVESTMENTSPORTFOLIOCOMPOSITIONScheduleofPercentageofPortfolioInvestmentsbyGeographicalRegionsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueDisclosuresAbstract_019e2207-0b60-7ff2-9f8b-a4f5509e0cda" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueDisclosuresAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_019e2207-0b60-7d9e-a2ac-0f3a663056dc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueDisclosuresAbstract_019e2207-0b60-7ff2-9f8b-a4f5509e0cda" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_019e2207-0b60-7d9e-a2ac-0f3a663056dc" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByTypeAxis_019e2207-0b60-7d69-9211-2b1cdc36008b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConcentrationRiskByTypeAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_019e2207-0b60-7d9e-a2ac-0f3a663056dc" xlink:to="loc_us-gaap_ConcentrationRiskByTypeAxis_019e2207-0b60-7d69-9211-2b1cdc36008b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_019e2207-0b60-7f05-87fe-532efe2b8289" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_019e2207-0b60-7d69-9211-2b1cdc36008b" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_019e2207-0b60-7f05-87fe-532efe2b8289" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeographicConcentrationRiskMember_019e2207-0b60-7993-b097-45782ce8ab46" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GeographicConcentrationRiskMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ConcentrationRiskTypeDomain_019e2207-0b60-7f05-87fe-532efe2b8289" xlink:to="loc_us-gaap_GeographicConcentrationRiskMember_019e2207-0b60-7993-b097-45782ce8ab46" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019e2207-0b60-768e-9ba9-3735d7403fb2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConcentrationRiskByBenchmarkAxis"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_019e2207-0b60-7d9e-a2ac-0f3a663056dc" xlink:to="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019e2207-0b60-768e-9ba9-3735d7403fb2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019e2207-0b60-74b8-a8f2-439cf33e173b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019e2207-0b60-768e-9ba9-3735d7403fb2" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019e2207-0b60-74b8-a8f2-439cf33e173b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_InvestmentOwnedAtCostMember_019e2207-0b60-7442-a48c-6cf62e247e4e" xlink:href="main-20260630.xsd#main_InvestmentOwnedAtCostMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019e2207-0b60-74b8-a8f2-439cf33e173b" xlink:to="loc_main_InvestmentOwnedAtCostMember_019e2207-0b60-7442-a48c-6cf62e247e4e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_InvestmentOwnedAtFairValueMember_019e2207-0b60-7fa2-86a5-749244d3f685" xlink:href="main-20260630.xsd#main_InvestmentOwnedAtFairValueMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019e2207-0b60-74b8-a8f2-439cf33e173b" xlink:to="loc_main_InvestmentOwnedAtFairValueMember_019e2207-0b60-7fa2-86a5-749244d3f685" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_019e2207-0b60-70fe-95aa-a2a17e5c647b" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_StatementGeographicalAxis"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_019e2207-0b60-7d9e-a2ac-0f3a663056dc" xlink:to="loc_srt_StatementGeographicalAxis_019e2207-0b60-70fe-95aa-a2a17e5c647b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_019e2207-0b60-7d88-ba8d-589c0f0f29f9" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_SegmentGeographicalDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_StatementGeographicalAxis_019e2207-0b60-70fe-95aa-a2a17e5c647b" xlink:to="loc_srt_SegmentGeographicalDomain_019e2207-0b60-7d88-ba8d-589c0f0f29f9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WestRegionMember_019e2207-0b60-74a8-8e35-cc0718bc3b4f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_WestRegionMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_SegmentGeographicalDomain_019e2207-0b60-7d88-ba8d-589c0f0f29f9" xlink:to="loc_us-gaap_WestRegionMember_019e2207-0b60-74a8-8e35-cc0718bc3b4f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MidwestRegionMember_019e2207-0b60-753b-8f44-ec0afe245bd8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MidwestRegionMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_SegmentGeographicalDomain_019e2207-0b60-7d88-ba8d-589c0f0f29f9" xlink:to="loc_us-gaap_MidwestRegionMember_019e2207-0b60-753b-8f44-ec0afe245bd8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SoutheastRegionMember_019e2207-0b60-77ca-ad09-538d37e041ea" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SoutheastRegionMember"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_SegmentGeographicalDomain_019e2207-0b60-7d88-ba8d-589c0f0f29f9" xlink:to="loc_us-gaap_SoutheastRegionMember_019e2207-0b60-77ca-ad09-538d37e041ea" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SouthwestRegionMember_019e2207-0b60-77d7-a9fc-6a8b999cc521" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SouthwestRegionMember"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_SegmentGeographicalDomain_019e2207-0b60-7d88-ba8d-589c0f0f29f9" xlink:to="loc_us-gaap_SouthwestRegionMember_019e2207-0b60-77d7-a9fc-6a8b999cc521" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NortheastRegionMember_019e2207-0b60-7bd5-a68a-6ed9b8e2b87f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NortheastRegionMember"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_SegmentGeographicalDomain_019e2207-0b60-7d88-ba8d-589c0f0f29f9" xlink:to="loc_us-gaap_NortheastRegionMember_019e2207-0b60-7bd5-a68a-6ed9b8e2b87f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_CA_019e2207-0b60-72cb-a7b5-6abfa299cb2f" xlink:href="https://xbrl.sec.gov/country/2026/country-2026.xsd#country_CA"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_SegmentGeographicalDomain_019e2207-0b60-7d88-ba8d-589c0f0f29f9" xlink:to="loc_country_CA_019e2207-0b60-72cb-a7b5-6abfa299cb2f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonUsMember_019e2207-0b60-7d51-bfa8-1c7bfca9ad97" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NonUsMember"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_SegmentGeographicalDomain_019e2207-0b60-7d88-ba8d-589c0f0f29f9" xlink:to="loc_us-gaap_NonUsMember_019e2207-0b60-7d51-bfa8-1c7bfca9ad97" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_019e2207-0b60-7062-a6cb-0974a7b094dc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_019e2207-0b60-7d9e-a2ac-0f3a663056dc" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_019e2207-0b60-7062-a6cb-0974a7b094dc" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskPercentage1_019e2207-0b60-76f1-b1be-943a948f7e9e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConcentrationRiskPercentage1"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_019e2207-0b60-7062-a6cb-0974a7b094dc" xlink:to="loc_us-gaap_ConcentrationRiskPercentage1_019e2207-0b60-76f1-b1be-943a948f7e9e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.mainstcapital.com/role/FAIRVALUEHIERARCHYFORINVESTMENTSPORTFOLIOCOMPOSITIONScheduleofPercentageofPortfolioInvestmentsbyIndustrySectorDetails" xlink:type="simple" xlink:href="main-20260630.xsd#FAIRVALUEHIERARCHYFORINVESTMENTSPORTFOLIOCOMPOSITIONScheduleofPercentageofPortfolioInvestmentsbyIndustrySectorDetails"/>
  <link:presentationLink xlink:role="http://www.mainstcapital.com/role/FAIRVALUEHIERARCHYFORINVESTMENTSPORTFOLIOCOMPOSITIONScheduleofPercentageofPortfolioInvestmentsbyIndustrySectorDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueDisclosuresAbstract_019e2207-0b60-7141-a463-26d3909d6689" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueDisclosuresAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_019e2207-0b60-77e2-bebf-319a451ea88f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueDisclosuresAbstract_019e2207-0b60-7141-a463-26d3909d6689" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_019e2207-0b60-77e2-bebf-319a451ea88f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByTypeAxis_019e2207-0b60-78bf-85db-d3ac847232c9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConcentrationRiskByTypeAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_019e2207-0b60-77e2-bebf-319a451ea88f" xlink:to="loc_us-gaap_ConcentrationRiskByTypeAxis_019e2207-0b60-78bf-85db-d3ac847232c9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_019e2207-0b60-7e77-bddf-1f6217b5e1e1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_019e2207-0b60-78bf-85db-d3ac847232c9" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_019e2207-0b60-7e77-bddf-1f6217b5e1e1" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_IndustryConcentrationRiskMember_019e2207-0b60-7f3b-9e4e-ed2173d6f831" xlink:href="main-20260630.xsd#main_IndustryConcentrationRiskMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ConcentrationRiskTypeDomain_019e2207-0b60-7e77-bddf-1f6217b5e1e1" xlink:to="loc_main_IndustryConcentrationRiskMember_019e2207-0b60-7f3b-9e4e-ed2173d6f831" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019e2207-0b60-77bf-aac5-6bf8a3fc8d9d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConcentrationRiskByBenchmarkAxis"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_019e2207-0b60-77e2-bebf-319a451ea88f" xlink:to="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019e2207-0b60-77bf-aac5-6bf8a3fc8d9d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019e2207-0b60-771f-887c-a3a70b669c76" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019e2207-0b60-77bf-aac5-6bf8a3fc8d9d" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019e2207-0b60-771f-887c-a3a70b669c76" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_InvestmentOwnedAtCostMember_019e2207-0b60-70e8-93cb-e0ad53b07df6" xlink:href="main-20260630.xsd#main_InvestmentOwnedAtCostMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019e2207-0b60-771f-887c-a3a70b669c76" xlink:to="loc_main_InvestmentOwnedAtCostMember_019e2207-0b60-70e8-93cb-e0ad53b07df6" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_InvestmentOwnedAtFairValueMember_019e2207-0b60-76d6-a3a0-cf71aba87406" xlink:href="main-20260630.xsd#main_InvestmentOwnedAtFairValueMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019e2207-0b60-771f-887c-a3a70b669c76" xlink:to="loc_main_InvestmentOwnedAtFairValueMember_019e2207-0b60-76d6-a3a0-cf71aba87406" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesByIndustryAxis_019e2207-0b60-7122-92a0-992590a82b1f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquitySecuritiesByIndustryAxis"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_019e2207-0b60-77e2-bebf-319a451ea88f" xlink:to="loc_us-gaap_EquitySecuritiesByIndustryAxis_019e2207-0b60-7122-92a0-992590a82b1f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesIndustryMember_019e2207-0b60-7141-b5c3-d27270c87c0c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquitySecuritiesIndustryMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquitySecuritiesByIndustryAxis_019e2207-0b60-7122-92a0-992590a82b1f" xlink:to="loc_us-gaap_EquitySecuritiesIndustryMember_019e2207-0b60-7141-b5c3-d27270c87c0c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_ConstructionEngineeringMember_019e2207-0b60-7d37-b5ca-b40b795446e0" xlink:href="main-20260630.xsd#main_ConstructionEngineeringMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquitySecuritiesIndustryMember_019e2207-0b60-7141-b5c3-d27270c87c0c" xlink:to="loc_main_ConstructionEngineeringMember_019e2207-0b60-7d37-b5ca-b40b795446e0" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_MachineryMember_019e2207-0b60-7393-8bb8-b33cab3ea344" xlink:href="main-20260630.xsd#main_MachineryMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquitySecuritiesIndustryMember_019e2207-0b60-7141-b5c3-d27270c87c0c" xlink:to="loc_main_MachineryMember_019e2207-0b60-7393-8bb8-b33cab3ea344" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_ElectricalEquipmentMember_019e2207-0b60-7360-aefa-9c682351c262" xlink:href="main-20260630.xsd#main_ElectricalEquipmentMember"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquitySecuritiesIndustryMember_019e2207-0b60-7141-b5c3-d27270c87c0c" xlink:to="loc_main_ElectricalEquipmentMember_019e2207-0b60-7360-aefa-9c682351c262" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_DiversifiedConsumerServicesMember_019e2207-0b60-786d-b45e-ca60b361475e" xlink:href="main-20260630.xsd#main_DiversifiedConsumerServicesMember"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquitySecuritiesIndustryMember_019e2207-0b60-7141-b5c3-d27270c87c0c" xlink:to="loc_main_DiversifiedConsumerServicesMember_019e2207-0b60-786d-b45e-ca60b361475e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_CommercialServicesSuppliesMember_019e2207-0b60-7f38-814a-06f223666960" xlink:href="main-20260630.xsd#main_CommercialServicesSuppliesMember"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquitySecuritiesIndustryMember_019e2207-0b60-7141-b5c3-d27270c87c0c" xlink:to="loc_main_CommercialServicesSuppliesMember_019e2207-0b60-7f38-814a-06f223666960" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_DistributorsMember_019e2207-0b60-73eb-aaeb-641e2f779240" xlink:href="main-20260630.xsd#main_DistributorsMember"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquitySecuritiesIndustryMember_019e2207-0b60-7141-b5c3-d27270c87c0c" xlink:to="loc_main_DistributorsMember_019e2207-0b60-73eb-aaeb-641e2f779240" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_ProfessionalServicesMember_019e2207-0b60-7501-98b9-4149e77736e5" xlink:href="main-20260630.xsd#main_ProfessionalServicesMember"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquitySecuritiesIndustryMember_019e2207-0b60-7141-b5c3-d27270c87c0c" xlink:to="loc_main_ProfessionalServicesMember_019e2207-0b60-7501-98b9-4149e77736e5" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_HealthCareProvidersServicesMember_019e2207-0b60-7ee5-90d2-773a9b2a7e70" xlink:href="main-20260630.xsd#main_HealthCareProvidersServicesMember"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquitySecuritiesIndustryMember_019e2207-0b60-7141-b5c3-d27270c87c0c" xlink:to="loc_main_HealthCareProvidersServicesMember_019e2207-0b60-7ee5-90d2-773a9b2a7e70" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_InternetSoftwareServicesMember_019e2207-0b60-7816-9a06-42d431061fdb" xlink:href="main-20260630.xsd#main_InternetSoftwareServicesMember"/>
    <link:presentationArc order="9" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquitySecuritiesIndustryMember_019e2207-0b60-7141-b5c3-d27270c87c0c" xlink:to="loc_main_InternetSoftwareServicesMember_019e2207-0b60-7816-9a06-42d431061fdb" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_AerospaceDefenseMember_019e2207-0b60-746d-b0e5-742bf6ebd8f8" xlink:href="main-20260630.xsd#main_AerospaceDefenseMember"/>
    <link:presentationArc order="10" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquitySecuritiesIndustryMember_019e2207-0b60-7141-b5c3-d27270c87c0c" xlink:to="loc_main_AerospaceDefenseMember_019e2207-0b60-746d-b0e5-742bf6ebd8f8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_ITServicesMember_019e2207-0b60-7ebc-943b-60ce2a46807d" xlink:href="main-20260630.xsd#main_ITServicesMember"/>
    <link:presentationArc order="11" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquitySecuritiesIndustryMember_019e2207-0b60-7141-b5c3-d27270c87c0c" xlink:to="loc_main_ITServicesMember_019e2207-0b60-7ebc-943b-60ce2a46807d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_ContainersPackagingMember_019e2207-0b60-7e5e-8305-385351779f6e" xlink:href="main-20260630.xsd#main_ContainersPackagingMember"/>
    <link:presentationArc order="12" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquitySecuritiesIndustryMember_019e2207-0b60-7141-b5c3-d27270c87c0c" xlink:to="loc_main_ContainersPackagingMember_019e2207-0b60-7e5e-8305-385351779f6e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_AutoComponentsMember_019e2207-0b60-7b01-be05-05c56298a3fb" xlink:href="main-20260630.xsd#main_AutoComponentsMember"/>
    <link:presentationArc order="13" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquitySecuritiesIndustryMember_019e2207-0b60-7141-b5c3-d27270c87c0c" xlink:to="loc_main_AutoComponentsMember_019e2207-0b60-7b01-be05-05c56298a3fb" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_TobaccoMember_019e2207-0b60-79f0-a86d-a8a0f2a67248" xlink:href="main-20260630.xsd#main_TobaccoMember"/>
    <link:presentationArc order="14" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquitySecuritiesIndustryMember_019e2207-0b60-7141-b5c3-d27270c87c0c" xlink:to="loc_main_TobaccoMember_019e2207-0b60-79f0-a86d-a8a0f2a67248" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_TextilesApparelLuxuryGoodsMember_019e2207-0b60-7936-b5af-a4a42a1c506d" xlink:href="main-20260630.xsd#main_TextilesApparelLuxuryGoodsMember"/>
    <link:presentationArc order="15" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquitySecuritiesIndustryMember_019e2207-0b60-7141-b5c3-d27270c87c0c" xlink:to="loc_main_TextilesApparelLuxuryGoodsMember_019e2207-0b60-7936-b5af-a4a42a1c506d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_LeisureEquipmentProductsMember_019e2207-0b60-753a-b437-893935a0fc6e" xlink:href="main-20260630.xsd#main_LeisureEquipmentProductsMember"/>
    <link:presentationArc order="16" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquitySecuritiesIndustryMember_019e2207-0b60-7141-b5c3-d27270c87c0c" xlink:to="loc_main_LeisureEquipmentProductsMember_019e2207-0b60-753a-b437-893935a0fc6e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_ComputersPeripheralsMember_019e2207-0b60-77d2-850d-d466677d20e2" xlink:href="main-20260630.xsd#main_ComputersPeripheralsMember"/>
    <link:presentationArc order="17" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquitySecuritiesIndustryMember_019e2207-0b60-7141-b5c3-d27270c87c0c" xlink:to="loc_main_ComputersPeripheralsMember_019e2207-0b60-77d2-850d-d466677d20e2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_MediaMember_019e2207-0b60-756e-b998-d78cf5cae1b8" xlink:href="main-20260630.xsd#main_MediaMember"/>
    <link:presentationArc order="18" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquitySecuritiesIndustryMember_019e2207-0b60-7141-b5c3-d27270c87c0c" xlink:to="loc_main_MediaMember_019e2207-0b60-756e-b998-d78cf5cae1b8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_EnergyEquipmentServicesMember_019e2207-0b60-7529-afc8-a9ef57bd8927" xlink:href="main-20260630.xsd#main_EnergyEquipmentServicesMember"/>
    <link:presentationArc order="19" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquitySecuritiesIndustryMember_019e2207-0b60-7141-b5c3-d27270c87c0c" xlink:to="loc_main_EnergyEquipmentServicesMember_019e2207-0b60-7529-afc8-a9ef57bd8927" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_AirFreightLogisticsMember_019e2207-0b60-783b-9c64-e7fe1321e1ad" xlink:href="main-20260630.xsd#main_AirFreightLogisticsMember"/>
    <link:presentationArc order="20" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquitySecuritiesIndustryMember_019e2207-0b60-7141-b5c3-d27270c87c0c" xlink:to="loc_main_AirFreightLogisticsMember_019e2207-0b60-783b-9c64-e7fe1321e1ad" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_SpecialtyRetailMember_019e2207-0b60-7261-80c1-87e85ec34f30" xlink:href="main-20260630.xsd#main_SpecialtyRetailMember"/>
    <link:presentationArc order="21" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquitySecuritiesIndustryMember_019e2207-0b60-7141-b5c3-d27270c87c0c" xlink:to="loc_main_SpecialtyRetailMember_019e2207-0b60-7261-80c1-87e85ec34f30" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_SoftwareMember_019e2207-0b60-7afc-ba2d-59588498661c" xlink:href="main-20260630.xsd#main_SoftwareMember"/>
    <link:presentationArc order="22" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquitySecuritiesIndustryMember_019e2207-0b60-7141-b5c3-d27270c87c0c" xlink:to="loc_main_SoftwareMember_019e2207-0b60-7afc-ba2d-59588498661c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_CommunicationsEquipmentMember_019e2207-0b60-72e8-8118-6968f667ec60" xlink:href="main-20260630.xsd#main_CommunicationsEquipmentMember"/>
    <link:presentationArc order="23" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquitySecuritiesIndustryMember_019e2207-0b60-7141-b5c3-d27270c87c0c" xlink:to="loc_main_CommunicationsEquipmentMember_019e2207-0b60-72e8-8118-6968f667ec60" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_TradingCompaniesDistributorsMember_019e2207-0b60-7a27-8e08-6f70f17f5ed5" xlink:href="main-20260630.xsd#main_TradingCompaniesDistributorsMember"/>
    <link:presentationArc order="24" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquitySecuritiesIndustryMember_019e2207-0b60-7141-b5c3-d27270c87c0c" xlink:to="loc_main_TradingCompaniesDistributorsMember_019e2207-0b60-7a27-8e08-6f70f17f5ed5" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_FoodProductsMember_019e2207-0b60-7e06-891b-cb7a486ab202" xlink:href="main-20260630.xsd#main_FoodProductsMember"/>
    <link:presentationArc order="25" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquitySecuritiesIndustryMember_019e2207-0b60-7141-b5c3-d27270c87c0c" xlink:to="loc_main_FoodProductsMember_019e2207-0b60-7e06-891b-cb7a486ab202" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_ChemicalsMember_019e2207-0b60-71e3-8b62-781c065a7c04" xlink:href="main-20260630.xsd#main_ChemicalsMember"/>
    <link:presentationArc order="26" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquitySecuritiesIndustryMember_019e2207-0b60-7141-b5c3-d27270c87c0c" xlink:to="loc_main_ChemicalsMember_019e2207-0b60-71e3-8b62-781c065a7c04" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_FoodStaplesRetailingMember_019e2207-0b60-7300-b21c-b80cb96b1755" xlink:href="main-20260630.xsd#main_FoodStaplesRetailingMember"/>
    <link:presentationArc order="27" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquitySecuritiesIndustryMember_019e2207-0b60-7141-b5c3-d27270c87c0c" xlink:to="loc_main_FoodStaplesRetailingMember_019e2207-0b60-7300-b21c-b80cb96b1755" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_HotelsRestaurantsLeisureMember_019e2207-0b60-793f-9594-d6441b43ab8b" xlink:href="main-20260630.xsd#main_HotelsRestaurantsLeisureMember"/>
    <link:presentationArc order="28" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquitySecuritiesIndustryMember_019e2207-0b60-7141-b5c3-d27270c87c0c" xlink:to="loc_main_HotelsRestaurantsLeisureMember_019e2207-0b60-793f-9594-d6441b43ab8b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_OilGasConsumableFuelsMember_019e2207-0b60-73ff-9702-339d32591556" xlink:href="main-20260630.xsd#main_OilGasConsumableFuelsMember"/>
    <link:presentationArc order="29" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquitySecuritiesIndustryMember_019e2207-0b60-7141-b5c3-d27270c87c0c" xlink:to="loc_main_OilGasConsumableFuelsMember_019e2207-0b60-73ff-9702-339d32591556" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_InternetCatalogRetailMember_019e2207-0b60-7e56-b141-451446708463" xlink:href="main-20260630.xsd#main_InternetCatalogRetailMember"/>
    <link:presentationArc order="30" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquitySecuritiesIndustryMember_019e2207-0b60-7141-b5c3-d27270c87c0c" xlink:to="loc_main_InternetCatalogRetailMember_019e2207-0b60-7e56-b141-451446708463" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_BeveragesMember_019e2207-0b60-7c03-9ccc-1f8a77d8284a" xlink:href="main-20260630.xsd#main_BeveragesMember"/>
    <link:presentationArc order="31" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquitySecuritiesIndustryMember_019e2207-0b60-7141-b5c3-d27270c87c0c" xlink:to="loc_main_BeveragesMember_019e2207-0b60-7c03-9ccc-1f8a77d8284a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_OtherMember_019e2207-0b60-7223-bd66-600588a3274d" xlink:href="main-20260630.xsd#main_OtherMember"/>
    <link:presentationArc order="32" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquitySecuritiesIndustryMember_019e2207-0b60-7141-b5c3-d27270c87c0c" xlink:to="loc_main_OtherMember_019e2207-0b60-7223-bd66-600588a3274d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_019e2207-0b60-78b9-8996-91175831c350" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_019e2207-0b60-77e2-bebf-319a451ea88f" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_019e2207-0b60-78b9-8996-91175831c350" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskPercentage1_019e2207-0b60-76b5-a5f7-80bddf35b373" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConcentrationRiskPercentage1"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_019e2207-0b60-78b9-8996-91175831c350" xlink:to="loc_us-gaap_ConcentrationRiskPercentage1_019e2207-0b60-76b5-a5f7-80bddf35b373" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.mainstcapital.com/role/EXTERNALINVESTMENTMANAGERNarrativeDetails" xlink:type="simple" xlink:href="main-20260630.xsd#EXTERNALINVESTMENTMANAGERNarrativeDetails"/>
  <link:presentationLink xlink:role="http://www.mainstcapital.com/role/EXTERNALINVESTMENTMANAGERNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentCompanyAbstract_019e2207-0b60-7e2e-8f4e-b092103435b5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentCompanyAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019e2207-0b60-7e30-9180-ba5f7edaad28" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentCompanyAbstract_019e2207-0b60-7e2e-8f4e-b092103435b5" xlink:to="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019e2207-0b60-7e30-9180-ba5f7edaad28" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentCompanyNonconsolidatedSubsidiaryAxis_019e2207-0b60-7a4c-a4e4-d030f01159bc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentCompanyNonconsolidatedSubsidiaryAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019e2207-0b60-7e30-9180-ba5f7edaad28" xlink:to="loc_us-gaap_InvestmentCompanyNonconsolidatedSubsidiaryAxis_019e2207-0b60-7a4c-a4e4-d030f01159bc" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentCompanyNonconsolidatedSubsidiaryDomain_019e2207-0b60-7228-85e4-979de8a58519" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentCompanyNonconsolidatedSubsidiaryDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentCompanyNonconsolidatedSubsidiaryAxis_019e2207-0b60-7a4c-a4e4-d030f01159bc" xlink:to="loc_us-gaap_InvestmentCompanyNonconsolidatedSubsidiaryDomain_019e2207-0b60-7228-85e4-979de8a58519" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_ExternalInvestmentManagerMember_019e2207-0b60-7e94-981f-68245b64d227" xlink:href="main-20260630.xsd#main_ExternalInvestmentManagerMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentCompanyNonconsolidatedSubsidiaryDomain_019e2207-0b60-7228-85e4-979de8a58519" xlink:to="loc_main_ExternalInvestmentManagerMember_019e2207-0b60-7e94-981f-68245b64d227" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionAxis_019e2207-0b60-7635-939d-42dde71e7dd9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyTransactionAxis"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019e2207-0b60-7e30-9180-ba5f7edaad28" xlink:to="loc_us-gaap_RelatedPartyTransactionAxis_019e2207-0b60-7635-939d-42dde71e7dd9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionDomain_019e2207-0b60-734b-9838-634a7f192657" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyTransactionDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RelatedPartyTransactionAxis_019e2207-0b60-7635-939d-42dde71e7dd9" xlink:to="loc_us-gaap_RelatedPartyTransactionDomain_019e2207-0b60-734b-9838-634a7f192657" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_AdvisoryAgreementPreviousMember_019e2207-0b60-736f-892e-9be41fe22ab0" xlink:href="main-20260630.xsd#main_AdvisoryAgreementPreviousMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RelatedPartyTransactionDomain_019e2207-0b60-734b-9838-634a7f192657" xlink:to="loc_main_AdvisoryAgreementPreviousMember_019e2207-0b60-736f-892e-9be41fe22ab0" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_AdvisoryAgreementActiveMember_019e2207-0b60-7196-9537-8fdc00c19f9b" xlink:href="main-20260630.xsd#main_AdvisoryAgreementActiveMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RelatedPartyTransactionDomain_019e2207-0b60-734b-9838-634a7f192657" xlink:to="loc_main_AdvisoryAgreementActiveMember_019e2207-0b60-7196-9537-8fdc00c19f9b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019e2207-0b60-727c-bed3-0c64b8df19da" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019e2207-0b60-7e30-9180-ba5f7edaad28" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019e2207-0b60-727c-bed3-0c64b8df19da" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019e2207-0b60-76c8-a5cc-d0e5c9eec331" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019e2207-0b60-727c-bed3-0c64b8df19da" xlink:to="loc_us-gaap_RelatedPartyDomain_019e2207-0b60-76c8-a5cc-d0e5c9eec331" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_AffiliatedEntityMember_019e2207-0b60-7705-9e05-49f5c09bcd27" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_AffiliatedEntityMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RelatedPartyDomain_019e2207-0b60-76c8-a5cc-d0e5c9eec331" xlink:to="loc_srt_AffiliatedEntityMember_019e2207-0b60-7705-9e05-49f5c09bcd27" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionLineItems_019e2207-0b60-7a2c-b013-82eae57b2bc6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyTransactionLineItems"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019e2207-0b60-7e30-9180-ba5f7edaad28" xlink:to="loc_us-gaap_RelatedPartyTransactionLineItems_019e2207-0b60-7a2c-b013-82eae57b2bc6" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ManagementAndServiceFeesBaseRate_019e2207-0b60-71ab-aa22-90ca70147ded" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ManagementAndServiceFeesBaseRate"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019e2207-0b60-7a2c-b013-82eae57b2bc6" xlink:to="loc_us-gaap_ManagementAndServiceFeesBaseRate_019e2207-0b60-71ab-aa22-90ca70147ded" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ManagementAndServiceFeesIncentiveRate_019e2207-0b60-7376-95b6-88c1fd592e53" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ManagementAndServiceFeesIncentiveRate"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019e2207-0b60-7a2c-b013-82eae57b2bc6" xlink:to="loc_us-gaap_ManagementAndServiceFeesIncentiveRate_019e2207-0b60-7376-95b6-88c1fd592e53" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ManagementAndServiceFeesRate_019e2207-0b60-7aec-8625-f36a119a4fec" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ManagementAndServiceFeesRate"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019e2207-0b60-7a2c-b013-82eae57b2bc6" xlink:to="loc_us-gaap_ManagementAndServiceFeesRate_019e2207-0b60-7aec-8625-f36a119a4fec" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetInvestmentIncome_019e2207-0b60-7eef-9d65-55ba1746ad92" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetInvestmentIncome"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019e2207-0b60-7a2c-b013-82eae57b2bc6" xlink:to="loc_us-gaap_NetInvestmentIncome_019e2207-0b60-7eef-9d65-55ba1746ad92" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncentiveFeePayableCapitalGainBased_019e2207-0b60-74bb-9d40-b804aa6d37c3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncentiveFeePayableCapitalGainBased"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019e2207-0b60-7a2c-b013-82eae57b2bc6" xlink:to="loc_us-gaap_IncentiveFeePayableCapitalGainBased_019e2207-0b60-74bb-9d40-b804aa6d37c3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.mainstcapital.com/role/EXTERNALINVESTMENTMANAGERScheduleofBalanceSheetDetails" xlink:type="simple" xlink:href="main-20260630.xsd#EXTERNALINVESTMENTMANAGERScheduleofBalanceSheetDetails"/>
  <link:presentationLink xlink:role="http://www.mainstcapital.com/role/EXTERNALINVESTMENTMANAGERScheduleofBalanceSheetDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentCompanyAbstract_019e2207-0b60-7fa4-af5d-64099e5992d6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentCompanyAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentCompanyNonconsolidatedSubsidiaryTable_019e2207-0b60-7d47-b1cb-e5a7b16a4a54" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentCompanyNonconsolidatedSubsidiaryTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentCompanyAbstract_019e2207-0b60-7fa4-af5d-64099e5992d6" xlink:to="loc_us-gaap_InvestmentCompanyNonconsolidatedSubsidiaryTable_019e2207-0b60-7d47-b1cb-e5a7b16a4a54" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentCompanyNonconsolidatedSubsidiaryAxis_019e2207-0b60-784f-9d76-682a3d8b4f31" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentCompanyNonconsolidatedSubsidiaryAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentCompanyNonconsolidatedSubsidiaryTable_019e2207-0b60-7d47-b1cb-e5a7b16a4a54" xlink:to="loc_us-gaap_InvestmentCompanyNonconsolidatedSubsidiaryAxis_019e2207-0b60-784f-9d76-682a3d8b4f31" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentCompanyNonconsolidatedSubsidiaryDomain_019e2207-0b60-78c6-b480-4d547d1d7ca7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentCompanyNonconsolidatedSubsidiaryDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentCompanyNonconsolidatedSubsidiaryAxis_019e2207-0b60-784f-9d76-682a3d8b4f31" xlink:to="loc_us-gaap_InvestmentCompanyNonconsolidatedSubsidiaryDomain_019e2207-0b60-78c6-b480-4d547d1d7ca7" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_ExternalInvestmentManagerMember_019e2207-0b60-72e6-b596-b7330d33ccc7" xlink:href="main-20260630.xsd#main_ExternalInvestmentManagerMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentCompanyNonconsolidatedSubsidiaryDomain_019e2207-0b60-78c6-b480-4d547d1d7ca7" xlink:to="loc_main_ExternalInvestmentManagerMember_019e2207-0b60-72e6-b596-b7330d33ccc7" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentCompanyNonconsolidatedSubsidiaryLineItems_019e2207-0b60-71d8-af7b-bce775da122b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentCompanyNonconsolidatedSubsidiaryLineItems"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentCompanyNonconsolidatedSubsidiaryTable_019e2207-0b60-7d47-b1cb-e5a7b16a4a54" xlink:to="loc_us-gaap_InvestmentCompanyNonconsolidatedSubsidiaryLineItems_019e2207-0b60-71d8-af7b-bce775da122b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableNet_019e2207-0b60-777d-be7d-77137a3d45a6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccountsReceivableNet"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentCompanyNonconsolidatedSubsidiaryLineItems_019e2207-0b60-71d8-af7b-bce775da122b" xlink:to="loc_us-gaap_AccountsReceivableNet_019e2207-0b60-777d-be7d-77137a3d45a6" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_019e2207-0b60-741a-a4cf-6257d163de60" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentCompanyNonconsolidatedSubsidiaryLineItems_019e2207-0b60-71d8-af7b-bce775da122b" xlink:to="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_019e2207-0b60-741a-a4cf-6257d163de60" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_019e2207-0b60-7abc-b80b-3c1a7ad8cd9c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Assets"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentCompanyNonconsolidatedSubsidiaryLineItems_019e2207-0b60-71d8-af7b-bce775da122b" xlink:to="loc_us-gaap_Assets_019e2207-0b60-7abc-b80b-3c1a7ad8cd9c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableCurrentAndNoncurrent_019e2207-0b60-7467-831a-6235422d143e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccountsPayableCurrentAndNoncurrent"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentCompanyNonconsolidatedSubsidiaryLineItems_019e2207-0b60-71d8-af7b-bce775da122b" xlink:to="loc_us-gaap_AccountsPayableCurrentAndNoncurrent_019e2207-0b60-7467-831a-6235422d143e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsPayableCurrentAndNoncurrent_019e2207-0b60-791c-b00f-60f344a9f199" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DividendsPayableCurrentAndNoncurrent"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentCompanyNonconsolidatedSubsidiaryLineItems_019e2207-0b60-71d8-af7b-bce775da122b" xlink:to="loc_us-gaap_DividendsPayableCurrentAndNoncurrent_019e2207-0b60-791c-b00f-60f344a9f199" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_019e2207-0b60-7fc7-ae43-ebdb7ddb51bf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquity"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentCompanyNonconsolidatedSubsidiaryLineItems_019e2207-0b60-71d8-af7b-bce775da122b" xlink:to="loc_us-gaap_StockholdersEquity_019e2207-0b60-7fc7-ae43-ebdb7ddb51bf" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_019e2207-0b60-7e3c-a8f6-0ec74fb271b9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilitiesAndStockholdersEquity"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentCompanyNonconsolidatedSubsidiaryLineItems_019e2207-0b60-71d8-af7b-bce775da122b" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquity_019e2207-0b60-7e3c-a8f6-0ec74fb271b9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.mainstcapital.com/role/EXTERNALINVESTMENTMANAGERScheduleofStatementofOperationsDetails" xlink:type="simple" xlink:href="main-20260630.xsd#EXTERNALINVESTMENTMANAGERScheduleofStatementofOperationsDetails"/>
  <link:presentationLink xlink:role="http://www.mainstcapital.com/role/EXTERNALINVESTMENTMANAGERScheduleofStatementofOperationsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentCompanyAbstract_019e2207-0b60-7147-bc3f-d665b742905b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentCompanyAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentCompanyNonconsolidatedSubsidiaryTable_019e2207-0b60-78ac-8a3e-baee352267c7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentCompanyNonconsolidatedSubsidiaryTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentCompanyAbstract_019e2207-0b60-7147-bc3f-d665b742905b" xlink:to="loc_us-gaap_InvestmentCompanyNonconsolidatedSubsidiaryTable_019e2207-0b60-78ac-8a3e-baee352267c7" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentCompanyNonconsolidatedSubsidiaryAxis_019e2207-0b60-717b-9e89-77aa5b8aa241" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentCompanyNonconsolidatedSubsidiaryAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentCompanyNonconsolidatedSubsidiaryTable_019e2207-0b60-78ac-8a3e-baee352267c7" xlink:to="loc_us-gaap_InvestmentCompanyNonconsolidatedSubsidiaryAxis_019e2207-0b60-717b-9e89-77aa5b8aa241" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentCompanyNonconsolidatedSubsidiaryDomain_019e2207-0b60-7ce1-8740-501a93daf854" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentCompanyNonconsolidatedSubsidiaryDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentCompanyNonconsolidatedSubsidiaryAxis_019e2207-0b60-717b-9e89-77aa5b8aa241" xlink:to="loc_us-gaap_InvestmentCompanyNonconsolidatedSubsidiaryDomain_019e2207-0b60-7ce1-8740-501a93daf854" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_ExternalInvestmentManagerMember_019e2207-0b60-7205-9196-478b16a5911f" xlink:href="main-20260630.xsd#main_ExternalInvestmentManagerMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentCompanyNonconsolidatedSubsidiaryDomain_019e2207-0b60-7ce1-8740-501a93daf854" xlink:to="loc_main_ExternalInvestmentManagerMember_019e2207-0b60-7205-9196-478b16a5911f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_019e2207-0b60-70cc-bfe7-1271b8e170a6" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductOrServiceAxis"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentCompanyNonconsolidatedSubsidiaryTable_019e2207-0b60-78ac-8a3e-baee352267c7" xlink:to="loc_srt_ProductOrServiceAxis_019e2207-0b60-70cc-bfe7-1271b8e170a6" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019e2207-0b60-7af8-ac51-46a4fa1c96d8" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductsAndServicesDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_ProductOrServiceAxis_019e2207-0b60-70cc-bfe7-1271b8e170a6" xlink:to="loc_srt_ProductsAndServicesDomain_019e2207-0b60-7af8-ac51-46a4fa1c96d8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ManagementServiceBaseMember_019e2207-0b60-7144-b629-fdf20040e13a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ManagementServiceBaseMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_ProductsAndServicesDomain_019e2207-0b60-7af8-ac51-46a4fa1c96d8" xlink:to="loc_us-gaap_ManagementServiceBaseMember_019e2207-0b60-7144-b629-fdf20040e13a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ManagementServiceIncentiveMember_019e2207-0b60-7356-b3c4-93c4bb8768e0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ManagementServiceIncentiveMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_ProductsAndServicesDomain_019e2207-0b60-7af8-ac51-46a4fa1c96d8" xlink:to="loc_us-gaap_ManagementServiceIncentiveMember_019e2207-0b60-7356-b3c4-93c4bb8768e0" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdministrativeServiceMember_019e2207-0b60-72f5-9201-32056a8cc466" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdministrativeServiceMember"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_ProductsAndServicesDomain_019e2207-0b60-7af8-ac51-46a4fa1c96d8" xlink:to="loc_us-gaap_AdministrativeServiceMember_019e2207-0b60-72f5-9201-32056a8cc466" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionAxis_019e2207-0b60-741a-87fe-2e7d593a9a17" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyTransactionAxis"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentCompanyNonconsolidatedSubsidiaryTable_019e2207-0b60-78ac-8a3e-baee352267c7" xlink:to="loc_us-gaap_RelatedPartyTransactionAxis_019e2207-0b60-741a-87fe-2e7d593a9a17" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionDomain_019e2207-0b60-7929-bc75-8523d3017423" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyTransactionDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RelatedPartyTransactionAxis_019e2207-0b60-741a-87fe-2e7d593a9a17" xlink:to="loc_us-gaap_RelatedPartyTransactionDomain_019e2207-0b60-7929-bc75-8523d3017423" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_AdvisoryAgreementActiveMember_019e2207-0b60-701d-966b-c2d5653b59ae" xlink:href="main-20260630.xsd#main_AdvisoryAgreementActiveMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RelatedPartyTransactionDomain_019e2207-0b60-7929-bc75-8523d3017423" xlink:to="loc_main_AdvisoryAgreementActiveMember_019e2207-0b60-701d-966b-c2d5653b59ae" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019e2207-0b60-7459-b6c3-249dc7ba6383" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentCompanyNonconsolidatedSubsidiaryTable_019e2207-0b60-78ac-8a3e-baee352267c7" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019e2207-0b60-7459-b6c3-249dc7ba6383" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019e2207-0b60-74de-9c40-59a5f7cb6146" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019e2207-0b60-7459-b6c3-249dc7ba6383" xlink:to="loc_us-gaap_RelatedPartyDomain_019e2207-0b60-74de-9c40-59a5f7cb6146" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_AffiliatedEntityMember_019e2207-0b60-7908-845e-be94f26c5591" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_AffiliatedEntityMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RelatedPartyDomain_019e2207-0b60-74de-9c40-59a5f7cb6146" xlink:to="loc_srt_AffiliatedEntityMember_019e2207-0b60-7908-845e-be94f26c5591" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentCompanyNonconsolidatedSubsidiaryLineItems_019e2207-0b60-778b-8ec5-a92b5fe3410f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentCompanyNonconsolidatedSubsidiaryLineItems"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentCompanyNonconsolidatedSubsidiaryTable_019e2207-0b60-78ac-8a3e-baee352267c7" xlink:to="loc_us-gaap_InvestmentCompanyNonconsolidatedSubsidiaryLineItems_019e2207-0b60-778b-8ec5-a92b5fe3410f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_019e2207-0b60-7a30-9dca-bd5702fe4bff" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Revenues"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentCompanyNonconsolidatedSubsidiaryLineItems_019e2207-0b60-778b-8ec5-a92b5fe3410f" xlink:to="loc_us-gaap_Revenues_019e2207-0b60-7a30-9dca-bd5702fe4bff" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentCompanyContractualAndVoluntaryFeesWaived_019e2207-0b60-786f-8e35-1e6df79caece" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentCompanyContractualAndVoluntaryFeesWaived"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentCompanyNonconsolidatedSubsidiaryLineItems_019e2207-0b60-778b-8ec5-a92b5fe3410f" xlink:to="loc_us-gaap_InvestmentCompanyContractualAndVoluntaryFeesWaived_019e2207-0b60-786f-8e35-1e6df79caece" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentCompanyExpenseAfterReductionOfFeeWaiverAndReimbursement_019e2207-0b60-7706-bf06-c89dac240627" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentCompanyExpenseAfterReductionOfFeeWaiverAndReimbursement"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentCompanyNonconsolidatedSubsidiaryLineItems_019e2207-0b60-778b-8ec5-a92b5fe3410f" xlink:to="loc_us-gaap_InvestmentCompanyExpenseAfterReductionOfFeeWaiverAndReimbursement_019e2207-0b60-7706-bf06-c89dac240627" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LaborAndRelatedExpense_019e2207-0b60-79a8-8501-ba36198e9cd0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LaborAndRelatedExpense"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentCompanyNonconsolidatedSubsidiaryLineItems_019e2207-0b60-778b-8ec5-a92b5fe3410f" xlink:to="loc_us-gaap_LaborAndRelatedExpense_019e2207-0b60-79a8-8501-ba36198e9cd0" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherGeneralAndAdministrativeExpense_019e2207-0b60-726a-898c-2aba9d993be0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherGeneralAndAdministrativeExpense"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentCompanyNonconsolidatedSubsidiaryLineItems_019e2207-0b60-778b-8ec5-a92b5fe3410f" xlink:to="loc_us-gaap_OtherGeneralAndAdministrativeExpense_019e2207-0b60-726a-898c-2aba9d993be0" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingExpenses_019e2207-0b60-7523-ac9b-1ff341cdf185" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingExpenses"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentCompanyNonconsolidatedSubsidiaryLineItems_019e2207-0b60-778b-8ec5-a92b5fe3410f" xlink:to="loc_us-gaap_OperatingExpenses_019e2207-0b60-7523-ac9b-1ff341cdf185" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedTotalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_OtherGeneralAndAdministrativeExpenseDirect_019e2207-0b60-754b-91cc-dea5c45542b7" xlink:href="main-20260630.xsd#main_OtherGeneralAndAdministrativeExpenseDirect"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentCompanyNonconsolidatedSubsidiaryLineItems_019e2207-0b60-778b-8ec5-a92b5fe3410f" xlink:to="loc_main_OtherGeneralAndAdministrativeExpenseDirect_019e2207-0b60-754b-91cc-dea5c45542b7" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentIncomeInvestmentExpense_019e2207-0b60-73a6-9c72-d7c347c59203" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentIncomeInvestmentExpense"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentCompanyNonconsolidatedSubsidiaryLineItems_019e2207-0b60-778b-8ec5-a92b5fe3410f" xlink:to="loc_us-gaap_InvestmentIncomeInvestmentExpense_019e2207-0b60-73a6-9c72-d7c347c59203" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedTotalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019e2207-0b60-783b-a095-d6a4a3921866" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:presentationArc order="9" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentCompanyNonconsolidatedSubsidiaryLineItems_019e2207-0b60-778b-8ec5-a92b5fe3410f" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019e2207-0b60-783b-a095-d6a4a3921866" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_019e2207-0b60-714b-a9ef-6a5f93201dac" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:presentationArc order="10" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentCompanyNonconsolidatedSubsidiaryLineItems_019e2207-0b60-778b-8ec5-a92b5fe3410f" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_019e2207-0b60-714b-a9ef-6a5f93201dac" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_019e2207-0b60-7a0f-8811-dfe734809921" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLoss"/>
    <link:presentationArc order="11" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentCompanyNonconsolidatedSubsidiaryLineItems_019e2207-0b60-778b-8ec5-a92b5fe3410f" xlink:to="loc_us-gaap_NetIncomeLoss_019e2207-0b60-7a0f-8811-dfe734809921" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_AccruedIncentiveFees_019fb8d1-1597-72d2-8d1a-fbc8d12f61e2" xlink:href="main-20260630.xsd#main_AccruedIncentiveFees"/>
    <link:presentationArc order="12" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentCompanyNonconsolidatedSubsidiaryLineItems_019e2207-0b60-778b-8ec5-a92b5fe3410f" xlink:to="loc_main_AccruedIncentiveFees_019fb8d1-1597-72d2-8d1a-fbc8d12f61e2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInIncentiveFeePayable_019e2207-0b60-7b4a-aa47-db12517812a3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInIncentiveFeePayable"/>
    <link:presentationArc order="13" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentCompanyNonconsolidatedSubsidiaryLineItems_019e2207-0b60-778b-8ec5-a92b5fe3410f" xlink:to="loc_us-gaap_IncreaseDecreaseInIncentiveFeePayable_019e2207-0b60-7b4a-aa47-db12517812a3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.mainstcapital.com/role/DEBTScheduleofDebtDetails" xlink:type="simple" xlink:href="main-20260630.xsd#DEBTScheduleofDebtDetails"/>
  <link:presentationLink xlink:role="http://www.mainstcapital.com/role/DEBTScheduleofDebtDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtDisclosureAbstract_019e2207-0b60-7bf0-b8c3-99630be87a3c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtDisclosureAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_019e2207-0b60-766a-b5a1-aa59c9cdfc78" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtDisclosureAbstract_019e2207-0b60-7bf0-b8c3-99630be87a3c" xlink:to="loc_us-gaap_DebtInstrumentTable_019e2207-0b60-766a-b5a1-aa59c9cdfc78" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_019e2207-0b60-743d-a668-9a1f9a5a69fb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditFacilityAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentTable_019e2207-0b60-766a-b5a1-aa59c9cdfc78" xlink:to="loc_us-gaap_CreditFacilityAxis_019e2207-0b60-743d-a668-9a1f9a5a69fb" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019e2207-0b60-7843-89b1-0af64124f00d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditFacilityDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CreditFacilityAxis_019e2207-0b60-743d-a668-9a1f9a5a69fb" xlink:to="loc_us-gaap_CreditFacilityDomain_019e2207-0b60-7843-89b1-0af64124f00d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_019e2207-0b60-7837-a3de-95a7608d1a5f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CreditFacilityDomain_019e2207-0b60-7843-89b1-0af64124f00d" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_019e2207-0b60-7837-a3de-95a7608d1a5f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_019e2207-0b60-77bd-b356-a4cc40bd9aa6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentTable_019e2207-0b60-766a-b5a1-aa59c9cdfc78" xlink:to="loc_us-gaap_DebtInstrumentAxis_019e2207-0b60-77bd-b356-a4cc40bd9aa6" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019e2207-0b60-76fb-a062-f524075ddf9f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentAxis_019e2207-0b60-77bd-b356-a4cc40bd9aa6" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019e2207-0b60-76fb-a062-f524075ddf9f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_CorporateFacilityMember_019e2207-0b60-7b87-b06a-aa48c05d9ba8" xlink:href="main-20260630.xsd#main_CorporateFacilityMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e2207-0b60-76fb-a062-f524075ddf9f" xlink:to="loc_main_CorporateFacilityMember_019e2207-0b60-7b87-b06a-aa48c05d9ba8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_SPVFacilityMember_019e2207-0b60-724b-9456-b4c955f62840" xlink:href="main-20260630.xsd#main_SPVFacilityMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e2207-0b60-76fb-a062-f524075ddf9f" xlink:to="loc_main_SPVFacilityMember_019e2207-0b60-724b-9456-b4c955f62840" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_March2029NotesMember_019e2207-0b60-759b-847d-b6dcf1d8c182" xlink:href="main-20260630.xsd#main_March2029NotesMember"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e2207-0b60-76fb-a062-f524075ddf9f" xlink:to="loc_main_March2029NotesMember_019e2207-0b60-759b-847d-b6dcf1d8c182" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_July2026NotesMember_019e2207-0b60-7cb8-9ad9-56091c9187b7" xlink:href="main-20260630.xsd#main_July2026NotesMember"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e2207-0b60-76fb-a062-f524075ddf9f" xlink:to="loc_main_July2026NotesMember_019e2207-0b60-7cb8-9ad9-56091c9187b7" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_June2027NotesMember_019e2207-0b60-71fa-8236-f2a0adaaa3e2" xlink:href="main-20260630.xsd#main_June2027NotesMember"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e2207-0b60-76fb-a062-f524075ddf9f" xlink:to="loc_main_June2027NotesMember_019e2207-0b60-71fa-8236-f2a0adaaa3e2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_August2028NotesMember_019e2207-0b60-7338-829a-441dff0b23b3" xlink:href="main-20260630.xsd#main_August2028NotesMember"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e2207-0b60-76fb-a062-f524075ddf9f" xlink:to="loc_main_August2028NotesMember_019e2207-0b60-7338-829a-441dff0b23b3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_SBICDebenturesMember_019e2207-0b60-7296-92e6-12352ea7832c" xlink:href="main-20260630.xsd#main_SBICDebenturesMember"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e2207-0b60-76fb-a062-f524075ddf9f" xlink:to="loc_main_SBICDebenturesMember_019e2207-0b60-7296-92e6-12352ea7832c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_April2031NotesMember_019e690d-d2cf-73b1-a0d5-c2da5900872c" xlink:href="main-20260630.xsd#main_April2031NotesMember"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e2207-0b60-76fb-a062-f524075ddf9f" xlink:to="loc_main_April2031NotesMember_019e690d-d2cf-73b1-a0d5-c2da5900872c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_019e2207-0b60-7e36-a96a-a870e0e70901" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentTable_019e2207-0b60-766a-b5a1-aa59c9cdfc78" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_019e2207-0b60-7e36-a96a-a870e0e70901" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019e2207-0b60-74fb-a619-a349df8d35da" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019e2207-0b60-7e36-a96a-a870e0e70901" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019e2207-0b60-74fb-a619-a349df8d35da" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_019e2207-0b60-7019-9e9e-ef7b1a3dc3e2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019e2207-0b60-74fb-a619-a349df8d35da" xlink:to="loc_us-gaap_LineOfCreditMember_019e2207-0b60-7019-9e9e-ef7b1a3dc3e2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnsecuredDebtMember_019e2207-0b60-7481-945d-35d32f88c67f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_UnsecuredDebtMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019e2207-0b60-74fb-a619-a349df8d35da" xlink:to="loc_us-gaap_UnsecuredDebtMember_019e2207-0b60-7481-945d-35d32f88c67f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_019e2207-0b60-7282-abd9-7fea0dafc5a2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentTable_019e2207-0b60-766a-b5a1-aa59c9cdfc78" xlink:to="loc_us-gaap_DebtInstrumentLineItems_019e2207-0b60-7282-abd9-7fea0dafc5a2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_019e2207-0b60-7279-8738-4257e661e63b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentCarryingAmount"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e2207-0b60-7282-abd9-7fea0dafc5a2" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_019e2207-0b60-7279-8738-4257e661e63b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet_019e2207-0b60-7842-92a1-9281658af9a8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e2207-0b60-7282-abd9-7fea0dafc5a2" xlink:to="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet_019e2207-0b60-7842-92a1-9281658af9a8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_019e2207-0b60-7be4-9ea4-30556894dbf1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermDebt"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e2207-0b60-7282-abd9-7fea0dafc5a2" xlink:to="loc_us-gaap_LongTermDebt_019e2207-0b60-7be4-9ea4-30556894dbf1" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFairValue_019e2207-0b60-7f73-9ac7-98fb9d77c512" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentFairValue"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e2207-0b60-7282-abd9-7fea0dafc5a2" xlink:to="loc_us-gaap_DebtInstrumentFairValue_019e2207-0b60-7f73-9ac7-98fb9d77c512" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.mainstcapital.com/role/DEBTScheduleofInterestExpenseDetails" xlink:type="simple" xlink:href="main-20260630.xsd#DEBTScheduleofInterestExpenseDetails"/>
  <link:presentationLink xlink:role="http://www.mainstcapital.com/role/DEBTScheduleofInterestExpenseDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtDisclosureAbstract_019e2207-0b60-737f-90c8-6db989f1854d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtDisclosureAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_019e2207-0b60-7a78-8d27-b46f8994b05f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtDisclosureAbstract_019e2207-0b60-737f-90c8-6db989f1854d" xlink:to="loc_us-gaap_DebtInstrumentTable_019e2207-0b60-7a78-8d27-b46f8994b05f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_019e2207-0b60-7acc-b524-82c0d9e89284" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditFacilityAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentTable_019e2207-0b60-7a78-8d27-b46f8994b05f" xlink:to="loc_us-gaap_CreditFacilityAxis_019e2207-0b60-7acc-b524-82c0d9e89284" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019e2207-0b60-7767-b378-c1c91dfea08b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditFacilityDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CreditFacilityAxis_019e2207-0b60-7acc-b524-82c0d9e89284" xlink:to="loc_us-gaap_CreditFacilityDomain_019e2207-0b60-7767-b378-c1c91dfea08b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_019e2207-0b60-7a33-901e-e3c3e2b3497b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CreditFacilityDomain_019e2207-0b60-7767-b378-c1c91dfea08b" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_019e2207-0b60-7a33-901e-e3c3e2b3497b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_019e2207-0b60-745b-ac74-77c78951c2b3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentTable_019e2207-0b60-7a78-8d27-b46f8994b05f" xlink:to="loc_us-gaap_DebtInstrumentAxis_019e2207-0b60-745b-ac74-77c78951c2b3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019e2207-0b60-7ad3-abf1-2d0ca04a3586" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentAxis_019e2207-0b60-745b-ac74-77c78951c2b3" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019e2207-0b60-7ad3-abf1-2d0ca04a3586" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_CorporateFacilityMember_019e2207-0b60-7c2f-96b6-783b374d3a4e" xlink:href="main-20260630.xsd#main_CorporateFacilityMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e2207-0b60-7ad3-abf1-2d0ca04a3586" xlink:to="loc_main_CorporateFacilityMember_019e2207-0b60-7c2f-96b6-783b374d3a4e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_SPVFacilityMember_019e2207-0b60-7491-bbc7-c380e0c6a38c" xlink:href="main-20260630.xsd#main_SPVFacilityMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e2207-0b60-7ad3-abf1-2d0ca04a3586" xlink:to="loc_main_SPVFacilityMember_019e2207-0b60-7491-bbc7-c380e0c6a38c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_March2029NotesMember_019e2207-0b60-718c-b56d-3d98dd0ae076" xlink:href="main-20260630.xsd#main_March2029NotesMember"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e2207-0b60-7ad3-abf1-2d0ca04a3586" xlink:to="loc_main_March2029NotesMember_019e2207-0b60-718c-b56d-3d98dd0ae076" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_July2026NotesMember_019e2207-0b60-79e9-b87c-ce22dcdc31c1" xlink:href="main-20260630.xsd#main_July2026NotesMember"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e2207-0b60-7ad3-abf1-2d0ca04a3586" xlink:to="loc_main_July2026NotesMember_019e2207-0b60-79e9-b87c-ce22dcdc31c1" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_June2027NotesMember_019e2207-0b60-76a5-9baa-605cdc055a7a" xlink:href="main-20260630.xsd#main_June2027NotesMember"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e2207-0b60-7ad3-abf1-2d0ca04a3586" xlink:to="loc_main_June2027NotesMember_019e2207-0b60-76a5-9baa-605cdc055a7a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_August2028NotesMember_019e2207-0b60-7a28-b9f5-ec9fc23556d0" xlink:href="main-20260630.xsd#main_August2028NotesMember"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e2207-0b60-7ad3-abf1-2d0ca04a3586" xlink:to="loc_main_August2028NotesMember_019e2207-0b60-7a28-b9f5-ec9fc23556d0" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_SBICDebenturesMember_019e2207-0b60-7877-ab1b-a7572f21792b" xlink:href="main-20260630.xsd#main_SBICDebenturesMember"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e2207-0b60-7ad3-abf1-2d0ca04a3586" xlink:to="loc_main_SBICDebenturesMember_019e2207-0b60-7877-ab1b-a7572f21792b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_December2025NotesMember_019e2207-0b60-70a3-9d4a-51618d0f45df" xlink:href="main-20260630.xsd#main_December2025NotesMember"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e2207-0b60-7ad3-abf1-2d0ca04a3586" xlink:to="loc_main_December2025NotesMember_019e2207-0b60-70a3-9d4a-51618d0f45df" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_April2031NotesMember_019e6912-e3eb-7a42-a833-c21da692b8bc" xlink:href="main-20260630.xsd#main_April2031NotesMember"/>
    <link:presentationArc order="9" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e2207-0b60-7ad3-abf1-2d0ca04a3586" xlink:to="loc_main_April2031NotesMember_019e6912-e3eb-7a42-a833-c21da692b8bc" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_019e2207-0b60-7a30-a27a-5d1c6b884cb0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentTable_019e2207-0b60-7a78-8d27-b46f8994b05f" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_019e2207-0b60-7a30-a27a-5d1c6b884cb0" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019e2207-0b60-71b0-acbc-d8f16d5700bc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019e2207-0b60-7a30-a27a-5d1c6b884cb0" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019e2207-0b60-71b0-acbc-d8f16d5700bc" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_019e2207-0b60-7d71-97ef-fea88ba75d84" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019e2207-0b60-71b0-acbc-d8f16d5700bc" xlink:to="loc_us-gaap_LineOfCreditMember_019e2207-0b60-7d71-97ef-fea88ba75d84" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnsecuredDebtMember_019e2207-0b60-7ae8-938d-d7df2bacddc4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_UnsecuredDebtMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019e2207-0b60-71b0-acbc-d8f16d5700bc" xlink:to="loc_us-gaap_UnsecuredDebtMember_019e2207-0b60-7ae8-938d-d7df2bacddc4" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_019e2207-0b60-77d1-8d0f-b6283ddc34b9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentTable_019e2207-0b60-7a78-8d27-b46f8994b05f" xlink:to="loc_us-gaap_DebtInstrumentLineItems_019e2207-0b60-77d1-8d0f-b6283ddc34b9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseDebt_019e2207-0b60-7da9-9773-2fdc6d865a5e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestExpenseDebt"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e2207-0b60-77d1-8d0f-b6283ddc34b9" xlink:to="loc_us-gaap_InterestExpenseDebt_019e2207-0b60-7da9-9773-2fdc6d865a5e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.mainstcapital.com/role/DEBTScheduleofAverageAmountofTotalBorrowingsOutstandingandOverallWeightedAverageEffectiveInterestRateDetails" xlink:type="simple" xlink:href="main-20260630.xsd#DEBTScheduleofAverageAmountofTotalBorrowingsOutstandingandOverallWeightedAverageEffectiveInterestRateDetails"/>
  <link:presentationLink xlink:role="http://www.mainstcapital.com/role/DEBTScheduleofAverageAmountofTotalBorrowingsOutstandingandOverallWeightedAverageEffectiveInterestRateDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtDisclosureAbstract_019e2207-0b60-7c12-a164-e787df4a5b75" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtDisclosureAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_019e2207-0b60-7b10-a75e-83bdf2ecd498" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtDisclosureAbstract_019e2207-0b60-7c12-a164-e787df4a5b75" xlink:to="loc_us-gaap_DebtInstrumentTable_019e2207-0b60-7b10-a75e-83bdf2ecd498" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019e2207-0b60-78af-b0e1-b7fc13ece08e" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentTable_019e2207-0b60-7b10-a75e-83bdf2ecd498" xlink:to="loc_srt_RangeAxis_019e2207-0b60-78af-b0e1-b7fc13ece08e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019e2207-0b60-7ea4-81b7-bb532a460f32" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeAxis_019e2207-0b60-78af-b0e1-b7fc13ece08e" xlink:to="loc_srt_RangeMember_019e2207-0b60-7ea4-81b7-bb532a460f32" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_WeightedAverageMember_019e2207-0b60-789b-8bdc-e975ec1b5bf7" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_WeightedAverageMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeMember_019e2207-0b60-7ea4-81b7-bb532a460f32" xlink:to="loc_srt_WeightedAverageMember_019e2207-0b60-789b-8bdc-e975ec1b5bf7" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_019e2207-0b60-7278-9d24-ffeec6ffdd56" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentTable_019e2207-0b60-7b10-a75e-83bdf2ecd498" xlink:to="loc_us-gaap_DebtInstrumentLineItems_019e2207-0b60-7278-9d24-ffeec6ffdd56" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtAverageAmountOutstanding_019e2207-0b60-7d31-bf47-8917c7b2fc0f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermDebtAverageAmountOutstanding"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e2207-0b60-7278-9d24-ffeec6ffdd56" xlink:to="loc_us-gaap_LongTermDebtAverageAmountOutstanding_019e2207-0b60-7d31-bf47-8917c7b2fc0f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateDuringPeriod_019e2207-0b60-750a-a272-8a71c0486e45" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentInterestRateDuringPeriod"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e2207-0b60-7278-9d24-ffeec6ffdd56" xlink:to="loc_us-gaap_DebtInstrumentInterestRateDuringPeriod_019e2207-0b60-750a-a272-8a71c0486e45" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/netLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.mainstcapital.com/role/DEBTCorporateFacilityDetails" xlink:type="simple" xlink:href="main-20260630.xsd#DEBTCorporateFacilityDetails"/>
  <link:presentationLink xlink:role="http://www.mainstcapital.com/role/DEBTCorporateFacilityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtDisclosureAbstract_019e2207-0b60-74f5-8a3e-72a0f796d1d5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtDisclosureAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityTable_019e2207-0b60-73e9-a8c6-651d8a2a3390" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditFacilityTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtDisclosureAbstract_019e2207-0b60-74f5-8a3e-72a0f796d1d5" xlink:to="loc_us-gaap_LineOfCreditFacilityTable_019e2207-0b60-73e9-a8c6-651d8a2a3390" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_019e2207-0b60-7c6e-87af-e95ca39acbc2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditFacilityAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_019e2207-0b60-73e9-a8c6-651d8a2a3390" xlink:to="loc_us-gaap_CreditFacilityAxis_019e2207-0b60-7c6e-87af-e95ca39acbc2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019e2207-0b60-760c-a1cd-c1ad48b6520a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditFacilityDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CreditFacilityAxis_019e2207-0b60-7c6e-87af-e95ca39acbc2" xlink:to="loc_us-gaap_CreditFacilityDomain_019e2207-0b60-760c-a1cd-c1ad48b6520a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_019e2207-0b60-7c64-86dc-f2cafc4718fb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CreditFacilityDomain_019e2207-0b60-760c-a1cd-c1ad48b6520a" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_019e2207-0b60-7c64-86dc-f2cafc4718fb" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_019e2207-0b60-7b23-9a9a-b2cf78402cf9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_019e2207-0b60-73e9-a8c6-651d8a2a3390" xlink:to="loc_us-gaap_DebtInstrumentAxis_019e2207-0b60-7b23-9a9a-b2cf78402cf9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019e2207-0b60-7a13-a0a5-db04a5124a79" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentAxis_019e2207-0b60-7b23-9a9a-b2cf78402cf9" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019e2207-0b60-7a13-a0a5-db04a5124a79" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_CorporateFacilityMember_019e2207-0b60-75e1-8d3e-b2a8365d95b8" xlink:href="main-20260630.xsd#main_CorporateFacilityMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e2207-0b60-7a13-a0a5-db04a5124a79" xlink:to="loc_main_CorporateFacilityMember_019e2207-0b60-75e1-8d3e-b2a8365d95b8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_019e2207-0b60-7ef7-9798-e879c0dcdfe5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_019e2207-0b60-73e9-a8c6-651d8a2a3390" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_019e2207-0b60-7ef7-9798-e879c0dcdfe5" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019e2207-0b60-7d48-974d-1f8d31eb6695" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019e2207-0b60-7ef7-9798-e879c0dcdfe5" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019e2207-0b60-7d48-974d-1f8d31eb6695" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_019e2207-0b60-7b43-8307-1be7fb944039" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019e2207-0b60-7d48-974d-1f8d31eb6695" xlink:to="loc_us-gaap_LineOfCreditMember_019e2207-0b60-7b43-8307-1be7fb944039" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_VariableRateComponentAxis_019e2207-0b60-72e9-ba1b-726a738eecfc" xlink:href="main-20260630.xsd#main_VariableRateComponentAxis"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_019e2207-0b60-73e9-a8c6-651d8a2a3390" xlink:to="loc_main_VariableRateComponentAxis_019e2207-0b60-72e9-ba1b-726a738eecfc" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_VariableRateComponentDomain_019e2207-0b60-7a3e-9442-90c4c52f3db2" xlink:href="main-20260630.xsd#main_VariableRateComponentDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_main_VariableRateComponentAxis_019e2207-0b60-72e9-ba1b-726a738eecfc" xlink:to="loc_main_VariableRateComponentDomain_019e2207-0b60-7a3e-9442-90c4c52f3db2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_VariableRateComponentOneMember_019e2207-0b60-77ec-80ee-b837d749e47c" xlink:href="main-20260630.xsd#main_VariableRateComponentOneMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_main_VariableRateComponentDomain_019e2207-0b60-7a3e-9442-90c4c52f3db2" xlink:to="loc_main_VariableRateComponentOneMember_019e2207-0b60-77ec-80ee-b837d749e47c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_VariableRateComponentTwoMember_019e2207-0b60-7bac-b0e8-e4e9870c2646" xlink:href="main-20260630.xsd#main_VariableRateComponentTwoMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_main_VariableRateComponentDomain_019e2207-0b60-7a3e-9442-90c4c52f3db2" xlink:to="loc_main_VariableRateComponentTwoMember_019e2207-0b60-7bac-b0e8-e4e9870c2646" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019e2207-0b60-72a0-b236-e9ab2b5abe01" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeAxis"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_019e2207-0b60-73e9-a8c6-651d8a2a3390" xlink:to="loc_srt_RangeAxis_019e2207-0b60-72a0-b236-e9ab2b5abe01" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019e2207-0b60-7d37-8b1f-d6d633e0450e" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeAxis_019e2207-0b60-72a0-b236-e9ab2b5abe01" xlink:to="loc_srt_RangeMember_019e2207-0b60-7d37-8b1f-d6d633e0450e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019e2207-0b60-7e18-93db-2f835b8017dc" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MinimumMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeMember_019e2207-0b60-7d37-8b1f-d6d633e0450e" xlink:to="loc_srt_MinimumMember_019e2207-0b60-7e18-93db-2f835b8017dc" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityLineItems_019e2207-0b60-77e4-8ee7-6f1348fd12f2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditFacilityLineItems"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_019e2207-0b60-73e9-a8c6-651d8a2a3390" xlink:to="loc_us-gaap_LineOfCreditFacilityLineItems_019e2207-0b60-77e4-8ee7-6f1348fd12f2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_019e2207-0b60-7380-83e6-9395727efe20" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019e2207-0b60-77e4-8ee7-6f1348fd12f2" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_019e2207-0b60-7380-83e6-9395727efe20" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_LineOfCreditFacilityMaximumBorrowingCapacityIncludingAccordionFeature_019e2207-0b60-7c38-a8af-8b660674f6be" xlink:href="main-20260630.xsd#main_LineOfCreditFacilityMaximumBorrowingCapacityIncludingAccordionFeature"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019e2207-0b60-77e4-8ee7-6f1348fd12f2" xlink:to="loc_main_LineOfCreditFacilityMaximumBorrowingCapacityIncludingAccordionFeature_019e2207-0b60-7c38-a8af-8b660674f6be" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_DebtInstrumentNumberOfLenders_019e2207-0b60-78cc-88bf-3c1ab4938b4f" xlink:href="main-20260630.xsd#main_DebtInstrumentNumberOfLenders"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019e2207-0b60-77e4-8ee7-6f1348fd12f2" xlink:to="loc_main_DebtInstrumentNumberOfLenders_019e2207-0b60-78cc-88bf-3c1ab4938b4f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_DebtInstrumentCreditSpreadAdjustment_019e2207-0b60-7dde-a575-a6a98ac8fd60" xlink:href="main-20260630.xsd#main_DebtInstrumentCreditSpreadAdjustment"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019e2207-0b60-77e4-8ee7-6f1348fd12f2" xlink:to="loc_main_DebtInstrumentCreditSpreadAdjustment_019e2207-0b60-7dde-a575-a6a98ac8fd60" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_019e2207-0b60-783b-bad9-086748f7eefa" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019e2207-0b60-77e4-8ee7-6f1348fd12f2" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_019e2207-0b60-783b-bad9-086748f7eefa" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_019e2207-0b60-777c-8d05-2d097b431062" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019e2207-0b60-77e4-8ee7-6f1348fd12f2" xlink:to="loc_us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_019e2207-0b60-777c-8d05-2d097b431062" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateEffectivePercentage_019e2207-0b60-76b1-bbef-11f297647cd5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentInterestRateEffectivePercentage"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019e2207-0b60-77e4-8ee7-6f1348fd12f2" xlink:to="loc_us-gaap_DebtInstrumentInterestRateEffectivePercentage_019e2207-0b60-76b1-bbef-11f297647cd5" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateDuringPeriod_019e2207-0b60-7c15-b39c-dc47927faf35" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentInterestRateDuringPeriod"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019e2207-0b60-77e4-8ee7-6f1348fd12f2" xlink:to="loc_us-gaap_DebtInstrumentInterestRateDuringPeriod_019e2207-0b60-7c15-b39c-dc47927faf35" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.mainstcapital.com/role/DEBTSPVFacilityDetails" xlink:type="simple" xlink:href="main-20260630.xsd#DEBTSPVFacilityDetails"/>
  <link:presentationLink xlink:role="http://www.mainstcapital.com/role/DEBTSPVFacilityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtDisclosureAbstract_019e2207-0b60-7995-b617-b053d98a01f8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtDisclosureAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityTable_019e2207-0b60-74b7-a158-502b4035d6d4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditFacilityTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtDisclosureAbstract_019e2207-0b60-7995-b617-b053d98a01f8" xlink:to="loc_us-gaap_LineOfCreditFacilityTable_019e2207-0b60-74b7-a158-502b4035d6d4" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_019e2207-0b60-7c7a-bc56-012930e08907" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditFacilityAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_019e2207-0b60-74b7-a158-502b4035d6d4" xlink:to="loc_us-gaap_CreditFacilityAxis_019e2207-0b60-7c7a-bc56-012930e08907" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019e2207-0b60-7c69-81a4-0d99bba1601d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditFacilityDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CreditFacilityAxis_019e2207-0b60-7c7a-bc56-012930e08907" xlink:to="loc_us-gaap_CreditFacilityDomain_019e2207-0b60-7c69-81a4-0d99bba1601d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_019e2207-0b60-7449-a8c1-e81212f597e8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CreditFacilityDomain_019e2207-0b60-7c69-81a4-0d99bba1601d" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_019e2207-0b60-7449-a8c1-e81212f597e8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_019e2207-0b60-70e0-8711-06be343f332a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_019e2207-0b60-74b7-a158-502b4035d6d4" xlink:to="loc_us-gaap_DebtInstrumentAxis_019e2207-0b60-70e0-8711-06be343f332a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019e2207-0b60-7f1b-a6ee-95fc9bc1d936" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentAxis_019e2207-0b60-70e0-8711-06be343f332a" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019e2207-0b60-7f1b-a6ee-95fc9bc1d936" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_SPVFacilityMember_019e2207-0b60-7962-8270-2a135616a55c" xlink:href="main-20260630.xsd#main_SPVFacilityMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e2207-0b60-7f1b-a6ee-95fc9bc1d936" xlink:to="loc_main_SPVFacilityMember_019e2207-0b60-7962-8270-2a135616a55c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_019e2207-0b60-7b41-ba8c-e4389fdd6328" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_019e2207-0b60-74b7-a158-502b4035d6d4" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_019e2207-0b60-7b41-ba8c-e4389fdd6328" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019e2207-0b60-7ebb-93ae-9ec89610151b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019e2207-0b60-7b41-ba8c-e4389fdd6328" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019e2207-0b60-7ebb-93ae-9ec89610151b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_019e2207-0b60-7389-8892-5a35d7261fe7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019e2207-0b60-7ebb-93ae-9ec89610151b" xlink:to="loc_us-gaap_LineOfCreditMember_019e2207-0b60-7389-8892-5a35d7261fe7" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019e2207-0b60-79af-83b9-c6df85f23656" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LegalEntityAxis"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_019e2207-0b60-74b7-a158-502b4035d6d4" xlink:to="loc_dei_LegalEntityAxis_019e2207-0b60-79af-83b9-c6df85f23656" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e2207-0b60-794c-a98a-4166743d9e0c" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_LegalEntityAxis_019e2207-0b60-79af-83b9-c6df85f23656" xlink:to="loc_dei_EntityDomain_019e2207-0b60-794c-a98a-4166743d9e0c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_MSCCFundingILLCMember_019e2207-0b60-7787-85b5-ef7f8c773c53" xlink:href="main-20260630.xsd#main_MSCCFundingILLCMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityDomain_019e2207-0b60-794c-a98a-4166743d9e0c" xlink:to="loc_main_MSCCFundingILLCMember_019e2207-0b60-7787-85b5-ef7f8c773c53" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_MarginEffectivePeriodAxis_019e2207-0b60-7c71-9f38-6a31bc76827f" xlink:href="main-20260630.xsd#main_MarginEffectivePeriodAxis"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_019e2207-0b60-74b7-a158-502b4035d6d4" xlink:to="loc_main_MarginEffectivePeriodAxis_019e2207-0b60-7c71-9f38-6a31bc76827f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_MarginEffectivePeriodDomain_019e2207-0b60-7da8-ac80-1f26df23ac38" xlink:href="main-20260630.xsd#main_MarginEffectivePeriodDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_main_MarginEffectivePeriodAxis_019e2207-0b60-7c71-9f38-6a31bc76827f" xlink:to="loc_main_MarginEffectivePeriodDomain_019e2207-0b60-7da8-ac80-1f26df23ac38" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_MarginEffectivePeriodOneMember_019e2207-0b60-78b8-935d-c8e64dd6617e" xlink:href="main-20260630.xsd#main_MarginEffectivePeriodOneMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_main_MarginEffectivePeriodDomain_019e2207-0b60-7da8-ac80-1f26df23ac38" xlink:to="loc_main_MarginEffectivePeriodOneMember_019e2207-0b60-78b8-935d-c8e64dd6617e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_MarginEffectivePeriodTwoMember_019e2207-0b60-74d4-b90f-1f1f04077355" xlink:href="main-20260630.xsd#main_MarginEffectivePeriodTwoMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_main_MarginEffectivePeriodDomain_019e2207-0b60-7da8-ac80-1f26df23ac38" xlink:to="loc_main_MarginEffectivePeriodTwoMember_019e2207-0b60-74d4-b90f-1f1f04077355" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019e2207-0b60-770d-a855-d9e66d81fd0e" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeAxis"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_019e2207-0b60-74b7-a158-502b4035d6d4" xlink:to="loc_srt_RangeAxis_019e2207-0b60-770d-a855-d9e66d81fd0e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019e2207-0b60-7149-b524-1af7a5437d83" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeAxis_019e2207-0b60-770d-a855-d9e66d81fd0e" xlink:to="loc_srt_RangeMember_019e2207-0b60-7149-b524-1af7a5437d83" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019e2207-0b60-71d1-9b1a-9b1c05ca935c" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MinimumMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeMember_019e2207-0b60-7149-b524-1af7a5437d83" xlink:to="loc_srt_MinimumMember_019e2207-0b60-71d1-9b1a-9b1c05ca935c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019e2207-0b60-7f44-9f51-1ff918ba8bbd" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MaximumMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeMember_019e2207-0b60-7149-b524-1af7a5437d83" xlink:to="loc_srt_MaximumMember_019e2207-0b60-7f44-9f51-1ff918ba8bbd" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityLineItems_019e2207-0b60-7c00-b85d-db24f53b4c90" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditFacilityLineItems"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_019e2207-0b60-74b7-a158-502b4035d6d4" xlink:to="loc_us-gaap_LineOfCreditFacilityLineItems_019e2207-0b60-7c00-b85d-db24f53b4c90" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_019e2207-0b60-7260-9683-9b0c54e9b9f2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019e2207-0b60-7c00-b85d-db24f53b4c90" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_019e2207-0b60-7260-9683-9b0c54e9b9f2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_DebtInstrumentNumberOfLenders_019e2207-0b60-722c-aa58-e610809828e2" xlink:href="main-20260630.xsd#main_DebtInstrumentNumberOfLenders"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019e2207-0b60-7c00-b85d-db24f53b4c90" xlink:to="loc_main_DebtInstrumentNumberOfLenders_019e2207-0b60-722c-aa58-e610809828e2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_LineOfCreditFacilityMaximumBorrowingCapacityIncludingAccordionFeature_019e2207-0b60-760a-b5d0-f6a26b4d11d6" xlink:href="main-20260630.xsd#main_LineOfCreditFacilityMaximumBorrowingCapacityIncludingAccordionFeature"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019e2207-0b60-7c00-b85d-db24f53b4c90" xlink:to="loc_main_LineOfCreditFacilityMaximumBorrowingCapacityIncludingAccordionFeature_019e2207-0b60-760a-b5d0-f6a26b4d11d6" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_019e2207-0b60-70fd-b9a5-76d9504b19b5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019e2207-0b60-7c00-b85d-db24f53b4c90" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_019e2207-0b60-70fd-b9a5-76d9504b19b5" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_019e2207-0b60-7125-800f-e0ce6092d479" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019e2207-0b60-7c00-b85d-db24f53b4c90" xlink:to="loc_us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_019e2207-0b60-7125-800f-e0ce6092d479" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityCommitmentFeePercentage_019e2207-0b60-7974-8802-b87c64217076" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditFacilityCommitmentFeePercentage"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019e2207-0b60-7c00-b85d-db24f53b4c90" xlink:to="loc_us-gaap_LineOfCreditFacilityCommitmentFeePercentage_019e2207-0b60-7974-8802-b87c64217076" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateEffectivePercentage_019e2207-0b60-7d50-8640-3c32151c2b02" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentInterestRateEffectivePercentage"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019e2207-0b60-7c00-b85d-db24f53b4c90" xlink:to="loc_us-gaap_DebtInstrumentInterestRateEffectivePercentage_019e2207-0b60-7d50-8640-3c32151c2b02" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateDuringPeriod_019e2207-0b60-706a-9cf8-10c6a41c5f94" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentInterestRateDuringPeriod"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019e2207-0b60-7c00-b85d-db24f53b4c90" xlink:to="loc_us-gaap_DebtInstrumentInterestRateDuringPeriod_019e2207-0b60-706a-9cf8-10c6a41c5f94" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.mainstcapital.com/role/DEBTScheduleofMSCCFundingBalanceSheetDetails" xlink:type="simple" xlink:href="main-20260630.xsd#DEBTScheduleofMSCCFundingBalanceSheetDetails"/>
  <link:presentationLink xlink:role="http://www.mainstcapital.com/role/DEBTScheduleofMSCCFundingBalanceSheetDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtDisclosureAbstract_019e2207-0b60-7240-9141-e17e5b4f2647" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtDisclosureAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CondensedBalanceSheetStatementTable_019e2207-0b60-795a-bdea-d91e520c4f83" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_CondensedBalanceSheetStatementTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtDisclosureAbstract_019e2207-0b60-7240-9141-e17e5b4f2647" xlink:to="loc_srt_CondensedBalanceSheetStatementTable_019e2207-0b60-795a-bdea-d91e520c4f83" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019e2207-0b60-7069-a1d4-61c86f84e45a" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LegalEntityAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_CondensedBalanceSheetStatementTable_019e2207-0b60-795a-bdea-d91e520c4f83" xlink:to="loc_dei_LegalEntityAxis_019e2207-0b60-7069-a1d4-61c86f84e45a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e2207-0b60-7d33-bcd2-a86f2bcad043" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_LegalEntityAxis_019e2207-0b60-7069-a1d4-61c86f84e45a" xlink:to="loc_dei_EntityDomain_019e2207-0b60-7d33-bcd2-a86f2bcad043" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_MSCCFundingILLCMember_019e2207-0b60-76d6-b1f2-0453976cc2d2" xlink:href="main-20260630.xsd#main_MSCCFundingILLCMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityDomain_019e2207-0b60-7d33-bcd2-a86f2bcad043" xlink:to="loc_main_MSCCFundingILLCMember_019e2207-0b60-76d6-b1f2-0453976cc2d2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CondensedBalanceSheetStatementsCaptionsLineItems_019e2207-0b60-763c-a6d0-7618f38ae404" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_CondensedBalanceSheetStatementsCaptionsLineItems"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_CondensedBalanceSheetStatementTable_019e2207-0b60-795a-bdea-d91e520c4f83" xlink:to="loc_srt_CondensedBalanceSheetStatementsCaptionsLineItems_019e2207-0b60-763c-a6d0-7618f38ae404" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsAbstract_019e2207-0b60-7f64-b3b7-7e07a2fafa46" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetsAbstract"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_CondensedBalanceSheetStatementsCaptionsLineItems_019e2207-0b60-763c-a6d0-7618f38ae404" xlink:to="loc_us-gaap_AssetsAbstract_019e2207-0b60-7f64-b3b7-7e07a2fafa46" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentOwnedAtFairValue_019e2207-0b60-7671-b7fc-329c0d94d780" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentOwnedAtFairValue"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsAbstract_019e2207-0b60-7f64-b3b7-7e07a2fafa46" xlink:to="loc_us-gaap_InvestmentOwnedAtFairValue_019e2207-0b60-7671-b7fc-329c0d94d780" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentOwnedAtCost_019e2207-0b60-73e8-9833-251a74b0fc4d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentOwnedAtCost"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentOwnedAtFairValue_019e2207-0b60-7671-b7fc-329c0d94d780" xlink:to="loc_us-gaap_InvestmentOwnedAtCost_019e2207-0b60-73e8-9833-251a74b0fc4d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_019e2207-0b60-79e1-834e-7d106b8e6f48" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsAbstract_019e2207-0b60-7f64-b3b7-7e07a2fafa46" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_019e2207-0b60-79e1-834e-7d106b8e6f48" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_InterestAndDividendReceivableAndOtherAssets_019e2207-0b60-7185-a506-c49fe2852f11" xlink:href="main-20260630.xsd#main_InterestAndDividendReceivableAndOtherAssets"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsAbstract_019e2207-0b60-7f64-b3b7-7e07a2fafa46" xlink:to="loc_main_InterestAndDividendReceivableAndOtherAssets_019e2207-0b60-7185-a506-c49fe2852f11" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFinanceCostsNet_019e2207-0b60-734f-aae4-b00de8eff389" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DeferredFinanceCostsNet"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsAbstract_019e2207-0b60-7f64-b3b7-7e07a2fafa46" xlink:to="loc_us-gaap_DeferredFinanceCostsNet_019e2207-0b60-734f-aae4-b00de8eff389" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedAmortizationDeferredFinanceCosts_019e2207-0b60-79aa-b0c4-b0615828f921" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedAmortizationDeferredFinanceCosts"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DeferredFinanceCostsNet_019e2207-0b60-734f-aae4-b00de8eff389" xlink:to="loc_us-gaap_AccumulatedAmortizationDeferredFinanceCosts_019e2207-0b60-79aa-b0c4-b0615828f921" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_019e2207-0b60-7e31-a7f3-76ed9f301756" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Assets"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsAbstract_019e2207-0b60-7f64-b3b7-7e07a2fafa46" xlink:to="loc_us-gaap_Assets_019e2207-0b60-7e31-a7f3-76ed9f301756" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAbstract_019e2207-0b60-76ff-b6f7-ad8890003e42" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilitiesAbstract"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_CondensedBalanceSheetStatementsCaptionsLineItems_019e2207-0b60-763c-a6d0-7618f38ae404" xlink:to="loc_us-gaap_LiabilitiesAbstract_019e2207-0b60-76ff-b6f7-ad8890003e42" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_019e2207-0b60-7395-b8ed-ae9f10cdce8f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermDebt"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAbstract_019e2207-0b60-76ff-b6f7-ad8890003e42" xlink:to="loc_us-gaap_LongTermDebt_019e2207-0b60-7395-b8ed-ae9f10cdce8f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/netLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableAndOtherAccruedLiabilities_019e2207-0b60-7b41-b82c-998080df3627" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccountsPayableAndOtherAccruedLiabilities"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAbstract_019e2207-0b60-76ff-b6f7-ad8890003e42" xlink:to="loc_us-gaap_AccountsPayableAndOtherAccruedLiabilities_019e2207-0b60-7b41-b82c-998080df3627" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestPayableCurrentAndNoncurrent_019e2207-0b60-7fdb-852a-951b21d0a95e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestPayableCurrentAndNoncurrent"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAbstract_019e2207-0b60-76ff-b6f7-ad8890003e42" xlink:to="loc_us-gaap_InterestPayableCurrentAndNoncurrent_019e2207-0b60-7fdb-852a-951b21d0a95e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_019e2207-0b60-7bbe-a554-32561fbcec0d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Liabilities"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAbstract_019e2207-0b60-76ff-b6f7-ad8890003e42" xlink:to="loc_us-gaap_Liabilities_019e2207-0b60-7bbe-a554-32561fbcec0d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityAbstract_019e2207-0b60-7bef-a13f-ad7da3525113" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquityAbstract"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_CondensedBalanceSheetStatementsCaptionsLineItems_019e2207-0b60-763c-a6d0-7618f38ae404" xlink:to="loc_us-gaap_StockholdersEquityAbstract_019e2207-0b60-7bef-a13f-ad7da3525113" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapital_019e2207-0b60-7662-895b-b46319188afc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdditionalPaidInCapital"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StockholdersEquityAbstract_019e2207-0b60-7bef-a13f-ad7da3525113" xlink:to="loc_us-gaap_AdditionalPaidInCapital_019e2207-0b60-7662-895b-b46319188afc" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_019e2207-0b60-76f6-a990-10ff2ab7fe3e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetainedEarningsAccumulatedDeficit"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StockholdersEquityAbstract_019e2207-0b60-7bef-a13f-ad7da3525113" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_019e2207-0b60-76f6-a990-10ff2ab7fe3e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_019e2207-0b60-7ea3-915c-ad6b492753f6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquity"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StockholdersEquityAbstract_019e2207-0b60-7bef-a13f-ad7da3525113" xlink:to="loc_us-gaap_StockholdersEquity_019e2207-0b60-7ea3-915c-ad6b492753f6" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_019e2207-0b60-7d39-a6dc-d317d2e1d874" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilitiesAndStockholdersEquity"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_CondensedBalanceSheetStatementsCaptionsLineItems_019e2207-0b60-763c-a6d0-7618f38ae404" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquity_019e2207-0b60-7d39-a6dc-d317d2e1d874" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.mainstcapital.com/role/DEBTScheduleofMSCCFundingStatementofOperationsDetails" xlink:type="simple" xlink:href="main-20260630.xsd#DEBTScheduleofMSCCFundingStatementofOperationsDetails"/>
  <link:presentationLink xlink:role="http://www.mainstcapital.com/role/DEBTScheduleofMSCCFundingStatementofOperationsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtDisclosureAbstract_019e2207-0b60-711a-9a51-e0953c72d448" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtDisclosureAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CondensedIncomeStatementTable_019e2207-0b60-791e-b201-3d963187b8b0" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_CondensedIncomeStatementTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtDisclosureAbstract_019e2207-0b60-711a-9a51-e0953c72d448" xlink:to="loc_srt_CondensedIncomeStatementTable_019e2207-0b60-791e-b201-3d963187b8b0" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019e2207-0b60-7126-82dc-03238b9e0b6e" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LegalEntityAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_CondensedIncomeStatementTable_019e2207-0b60-791e-b201-3d963187b8b0" xlink:to="loc_dei_LegalEntityAxis_019e2207-0b60-7126-82dc-03238b9e0b6e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e2207-0b60-7c8a-8db2-831ad6c96cf1" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_LegalEntityAxis_019e2207-0b60-7126-82dc-03238b9e0b6e" xlink:to="loc_dei_EntityDomain_019e2207-0b60-7c8a-8db2-831ad6c96cf1" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_MSCCFundingILLCMember_019e2207-0b60-725f-b0cb-47906cc9f7a9" xlink:href="main-20260630.xsd#main_MSCCFundingILLCMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityDomain_019e2207-0b60-7c8a-8db2-831ad6c96cf1" xlink:to="loc_main_MSCCFundingILLCMember_019e2207-0b60-725f-b0cb-47906cc9f7a9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CondensedIncomeStatementsCaptionsLineItems_019e2207-0b60-7714-98c0-e8d61d081b42" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_CondensedIncomeStatementsCaptionsLineItems"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_CondensedIncomeStatementTable_019e2207-0b60-791e-b201-3d963187b8b0" xlink:to="loc_srt_CondensedIncomeStatementsCaptionsLineItems_019e2207-0b60-7714-98c0-e8d61d081b42" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentIncomeNetAbstract_019e2207-0b60-7b82-91b0-b4ca56256291" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentIncomeNetAbstract"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_CondensedIncomeStatementsCaptionsLineItems_019e2207-0b60-7714-98c0-e8d61d081b42" xlink:to="loc_us-gaap_InvestmentIncomeNetAbstract_019e2207-0b60-7b82-91b0-b4ca56256291" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GrossInvestmentIncomeOperating_019e2207-0b60-7fdf-9bba-7f2e445c5491" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GrossInvestmentIncomeOperating"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIncomeNetAbstract_019e2207-0b60-7b82-91b0-b4ca56256291" xlink:to="loc_us-gaap_GrossInvestmentIncomeOperating_019e2207-0b60-7fdf-9bba-7f2e445c5491" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestAndDebtExpenseAbstract_019e2207-0b60-7059-8f32-0156af668e1c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestAndDebtExpenseAbstract"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_CondensedIncomeStatementsCaptionsLineItems_019e2207-0b60-7714-98c0-e8d61d081b42" xlink:to="loc_us-gaap_InterestAndDebtExpenseAbstract_019e2207-0b60-7059-8f32-0156af668e1c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseOperating_019e2207-0b60-7edc-8804-1e6c619cfee3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestExpenseOperating"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InterestAndDebtExpenseAbstract_019e2207-0b60-7059-8f32-0156af668e1c" xlink:to="loc_us-gaap_InterestExpenseOperating_019e2207-0b60-7edc-8804-1e6c619cfee3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ManagementFeeExpense_019e2207-0b60-7e81-a49b-162b9bdedf4a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ManagementFeeExpense"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InterestAndDebtExpenseAbstract_019e2207-0b60-7059-8f32-0156af668e1c" xlink:to="loc_us-gaap_ManagementFeeExpense_019e2207-0b60-7e81-a49b-162b9bdedf4a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeneralAndAdministrativeExpense_019e2207-0b60-745e-afa8-02a79341bfd9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GeneralAndAdministrativeExpense"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InterestAndDebtExpenseAbstract_019e2207-0b60-7059-8f32-0156af668e1c" xlink:to="loc_us-gaap_GeneralAndAdministrativeExpense_019e2207-0b60-745e-afa8-02a79341bfd9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentIncomeInvestmentExpense_019e2207-0b60-7116-a491-138c418fef2f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentIncomeInvestmentExpense"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InterestAndDebtExpenseAbstract_019e2207-0b60-7059-8f32-0156af668e1c" xlink:to="loc_us-gaap_InvestmentIncomeInvestmentExpense_019e2207-0b60-7116-a491-138c418fef2f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedTotalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetInvestmentIncome_019e2207-0b60-7181-8794-b82231294a36" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetInvestmentIncome"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_CondensedIncomeStatementsCaptionsLineItems_019e2207-0b60-7714-98c0-e8d61d081b42" xlink:to="loc_us-gaap_NetInvestmentIncome_019e2207-0b60-7181-8794-b82231294a36" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetInvestmentIncomeAbstract_019e2207-0b60-7df0-801c-740b1ad2f748" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetInvestmentIncomeAbstract"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_CondensedIncomeStatementsCaptionsLineItems_019e2207-0b60-7714-98c0-e8d61d081b42" xlink:to="loc_us-gaap_NetInvestmentIncomeAbstract_019e2207-0b60-7df0-801c-740b1ad2f748" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtAndEquitySecuritiesRealizedGainLoss_019f8fee-4957-7586-a89e-0b3defd32458" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtAndEquitySecuritiesRealizedGainLoss"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetInvestmentIncomeAbstract_019e2207-0b60-7df0-801c-740b1ad2f748" xlink:to="loc_us-gaap_DebtAndEquitySecuritiesRealizedGainLoss_019f8fee-4957-7586-a89e-0b3defd32458" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/netLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtAndEquitySecuritiesUnrealizedGainLoss_019e2207-0b60-7a53-93d4-a1876b3ae825" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtAndEquitySecuritiesUnrealizedGainLoss"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetInvestmentIncomeAbstract_019e2207-0b60-7df0-801c-740b1ad2f748" xlink:to="loc_us-gaap_DebtAndEquitySecuritiesUnrealizedGainLoss_019e2207-0b60-7a53-93d4-a1876b3ae825" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/netLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_019e2207-0b60-7392-ae63-e84d5375f77b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLoss"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetInvestmentIncomeAbstract_019e2207-0b60-7df0-801c-740b1ad2f748" xlink:to="loc_us-gaap_NetIncomeLoss_019e2207-0b60-7392-ae63-e84d5375f77b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.mainstcapital.com/role/DEBTNotesDueandSBICDebenturesDetails" xlink:type="simple" xlink:href="main-20260630.xsd#DEBTNotesDueandSBICDebenturesDetails"/>
  <link:presentationLink xlink:role="http://www.mainstcapital.com/role/DEBTNotesDueandSBICDebenturesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtDisclosureAbstract_019e2207-0b60-7a00-b53c-da7a878ba457" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtDisclosureAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_019e2207-0b60-78dd-a251-e009b4a2ce63" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtDisclosureAbstract_019e2207-0b60-7a00-b53c-da7a878ba457" xlink:to="loc_us-gaap_DebtInstrumentTable_019e2207-0b60-78dd-a251-e009b4a2ce63" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_019e2207-0b60-7373-810c-28a7b85d7b77" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentTable_019e2207-0b60-78dd-a251-e009b4a2ce63" xlink:to="loc_us-gaap_DebtInstrumentAxis_019e2207-0b60-7373-810c-28a7b85d7b77" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019e2207-0b60-706c-9b4f-c1f0131d43c1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentAxis_019e2207-0b60-7373-810c-28a7b85d7b77" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019e2207-0b60-706c-9b4f-c1f0131d43c1" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_March2029NotesMember_019e2207-0b60-74be-ab6a-eff5b1431afa" xlink:href="main-20260630.xsd#main_March2029NotesMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e2207-0b60-706c-9b4f-c1f0131d43c1" xlink:to="loc_main_March2029NotesMember_019e2207-0b60-74be-ab6a-eff5b1431afa" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_July2026NotesMember_019e2207-0b60-7715-9275-53c0cc1754ca" xlink:href="main-20260630.xsd#main_July2026NotesMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e2207-0b60-706c-9b4f-c1f0131d43c1" xlink:to="loc_main_July2026NotesMember_019e2207-0b60-7715-9275-53c0cc1754ca" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_June2027NotesMember_019e2207-0b60-7b94-95ad-ba82401f222b" xlink:href="main-20260630.xsd#main_June2027NotesMember"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e2207-0b60-706c-9b4f-c1f0131d43c1" xlink:to="loc_main_June2027NotesMember_019e2207-0b60-7b94-95ad-ba82401f222b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_June2027NotesAdditionalMember_019e2207-0b60-7327-a27f-3c873e29bc1a" xlink:href="main-20260630.xsd#main_June2027NotesAdditionalMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_main_June2027NotesMember_019e2207-0b60-7b94-95ad-ba82401f222b" xlink:to="loc_main_June2027NotesAdditionalMember_019e2207-0b60-7327-a27f-3c873e29bc1a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_August2028NotesMember_019e2207-0b60-7994-87ff-0f38569465eb" xlink:href="main-20260630.xsd#main_August2028NotesMember"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e2207-0b60-706c-9b4f-c1f0131d43c1" xlink:to="loc_main_August2028NotesMember_019e2207-0b60-7994-87ff-0f38569465eb" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_SBICDebenturesMember_019e2207-0b60-752b-9e59-3094b0c40b69" xlink:href="main-20260630.xsd#main_SBICDebenturesMember"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e2207-0b60-706c-9b4f-c1f0131d43c1" xlink:to="loc_main_SBICDebenturesMember_019e2207-0b60-752b-9e59-3094b0c40b69" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_April2031NotesMember_019e692b-7d6c-7a9d-92ad-34c776629fab" xlink:href="main-20260630.xsd#main_April2031NotesMember"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e2207-0b60-706c-9b4f-c1f0131d43c1" xlink:to="loc_main_April2031NotesMember_019e692b-7d6c-7a9d-92ad-34c776629fab" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_December2025SeriesANotesMember_019e2207-0b60-7f32-8787-88ef213af1a7" xlink:href="main-20260630.xsd#main_December2025SeriesANotesMember"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e2207-0b60-706c-9b4f-c1f0131d43c1" xlink:to="loc_main_December2025SeriesANotesMember_019e2207-0b60-7f32-8787-88ef213af1a7" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_December2025SeriesBNotesMember_019e2207-0b60-7e3c-acae-dc75bc4443da" xlink:href="main-20260630.xsd#main_December2025SeriesBNotesMember"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e2207-0b60-706c-9b4f-c1f0131d43c1" xlink:to="loc_main_December2025SeriesBNotesMember_019e2207-0b60-7e3c-acae-dc75bc4443da" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_019e2207-0b60-721f-a97e-32838d2c9d19" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentTable_019e2207-0b60-78dd-a251-e009b4a2ce63" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_019e2207-0b60-721f-a97e-32838d2c9d19" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019e2207-0b60-7abc-9cbe-8a560ed642a2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019e2207-0b60-721f-a97e-32838d2c9d19" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019e2207-0b60-7abc-9cbe-8a560ed642a2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnsecuredDebtMember_019e2207-0b60-7731-bd39-8c7dd0848694" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_UnsecuredDebtMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019e2207-0b60-7abc-9cbe-8a560ed642a2" xlink:to="loc_us-gaap_UnsecuredDebtMember_019e2207-0b60-7731-bd39-8c7dd0848694" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019e2207-0b60-7d86-abfc-456907442e28" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeAxis"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentTable_019e2207-0b60-78dd-a251-e009b4a2ce63" xlink:to="loc_srt_RangeAxis_019e2207-0b60-7d86-abfc-456907442e28" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019e2207-0b60-7249-9fb4-ddd1fde861d4" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeAxis_019e2207-0b60-7d86-abfc-456907442e28" xlink:to="loc_srt_RangeMember_019e2207-0b60-7249-9fb4-ddd1fde861d4" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019e2207-0b60-7c45-a51c-c7105539659c" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MaximumMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeMember_019e2207-0b60-7249-9fb4-ddd1fde861d4" xlink:to="loc_srt_MaximumMember_019e2207-0b60-7c45-a51c-c7105539659c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019e2207-0b60-7ef0-ad6a-d9cd84d74015" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LegalEntityAxis"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentTable_019e2207-0b60-78dd-a251-e009b4a2ce63" xlink:to="loc_dei_LegalEntityAxis_019e2207-0b60-7ef0-ad6a-d9cd84d74015" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e2207-0b60-795c-a133-596eb15078e5" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_LegalEntityAxis_019e2207-0b60-7ef0-ad6a-d9cd84d74015" xlink:to="loc_dei_EntityDomain_019e2207-0b60-795c-a133-596eb15078e5" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_MainStreetMezzanineFundLPMember_019e2207-0b60-759b-8224-f1935c65f028" xlink:href="main-20260630.xsd#main_MainStreetMezzanineFundLPMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityDomain_019e2207-0b60-795c-a133-596eb15078e5" xlink:to="loc_main_MainStreetMezzanineFundLPMember_019e2207-0b60-759b-8224-f1935c65f028" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_MainStreetCapitalIIILPMember_019e2207-0b60-7fc1-85de-f6811ae15b5b" xlink:href="main-20260630.xsd#main_MainStreetCapitalIIILPMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityDomain_019e2207-0b60-795c-a133-596eb15078e5" xlink:to="loc_main_MainStreetCapitalIIILPMember_019e2207-0b60-7fc1-85de-f6811ae15b5b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_019e2207-0b60-7475-94e6-e2ebf939281a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentTable_019e2207-0b60-78dd-a251-e009b4a2ce63" xlink:to="loc_us-gaap_DebtInstrumentLineItems_019e2207-0b60-7475-94e6-e2ebf939281a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_019eb6a8-ae41-7403-bdc8-1783b603d7df" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentFaceAmount"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e2207-0b60-7475-94e6-e2ebf939281a" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_019eb6a8-ae41-7403-bdc8-1783b603d7df" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_019eb6a8-ae41-7f33-ad5d-28ad4fa7b37d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e2207-0b60-7475-94e6-e2ebf939281a" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_019eb6a8-ae41-7f33-ad5d-28ad4fa7b37d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_DebtInstrumentIssuancePricePercentage_019eb6a8-ae41-7f98-9fef-2d0f64a9c27e" xlink:href="main-20260630.xsd#main_DebtInstrumentIssuancePricePercentage"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e2207-0b60-7475-94e6-e2ebf939281a" xlink:to="loc_main_DebtInstrumentIssuancePricePercentage_019eb6a8-ae41-7f98-9fef-2d0f64a9c27e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_DebtInstrumentFaceAmountAdditionalIssuance_019eb6a8-ae41-7d5e-8111-0d501ebd5d4d" xlink:href="main-20260630.xsd#main_DebtInstrumentFaceAmountAdditionalIssuance"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e2207-0b60-7475-94e6-e2ebf939281a" xlink:to="loc_main_DebtInstrumentFaceAmountAdditionalIssuance_019eb6a8-ae41-7d5e-8111-0d501ebd5d4d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_DebtInstrumentInterestRateYieldToWorst_019eb6a8-ae41-774d-8dc7-b6d9e66eeb93" xlink:href="main-20260630.xsd#main_DebtInstrumentInterestRateYieldToWorst"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e2207-0b60-7475-94e6-e2ebf939281a" xlink:to="loc_main_DebtInstrumentInterestRateYieldToWorst_019eb6a8-ae41-774d-8dc7-b6d9e66eeb93" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_019eb6a9-c52a-7a13-a773-c76a0228da91" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentCarryingAmount"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e2207-0b60-7475-94e6-e2ebf939281a" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_019eb6a9-c52a-7a13-a773-c76a0228da91" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_DebtInstrumentAdditionalCarryingAmount_019f4103-3a73-7ebd-9d35-817fde3ae81b" xlink:href="main-20260630.xsd#main_DebtInstrumentAdditionalCarryingAmount"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e2207-0b60-7475-94e6-e2ebf939281a" xlink:to="loc_main_DebtInstrumentAdditionalCarryingAmount_019f4103-3a73-7ebd-9d35-817fde3ae81b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTerm_019eb6a9-c52a-797a-a4a8-9bd93ffac434" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentTerm"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e2207-0b60-7475-94e6-e2ebf939281a" xlink:to="loc_us-gaap_DebtInstrumentTerm_019eb6a9-c52a-797a-a4a8-9bd93ffac434" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtWeightedAverageInterestRate_019eb6a9-c52a-723a-887d-fa64f724b5ff" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtWeightedAverageInterestRate"/>
    <link:presentationArc order="9" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e2207-0b60-7475-94e6-e2ebf939281a" xlink:to="loc_us-gaap_DebtWeightedAverageInterestRate_019eb6a9-c52a-723a-887d-fa64f724b5ff" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_DebtInstrumentRemainingTerm_019eb6a9-c52a-7adf-9fbc-d5d53318ee3b" xlink:href="main-20260630.xsd#main_DebtInstrumentRemainingTerm"/>
    <link:presentationArc order="10" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e2207-0b60-7475-94e6-e2ebf939281a" xlink:to="loc_main_DebtInstrumentRemainingTerm_019eb6a9-c52a-7adf-9fbc-d5d53318ee3b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_019eb6a9-c52a-747f-b036-31cfc238ce68" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermDebt"/>
    <link:presentationArc order="11" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e2207-0b60-7475-94e6-e2ebf939281a" xlink:to="loc_us-gaap_LongTermDebt_019eb6a9-c52a-747f-b036-31cfc238ce68" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFinanceCostsGross_019eb6a9-c52a-7730-beb3-6ef2f19cecab" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DeferredFinanceCostsGross"/>
    <link:presentationArc order="12" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e2207-0b60-7475-94e6-e2ebf939281a" xlink:to="loc_us-gaap_DeferredFinanceCostsGross_019eb6a9-c52a-7730-beb3-6ef2f19cecab" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.mainstcapital.com/role/FINANCIALHIGHLIGHTSDetails" xlink:type="simple" xlink:href="main-20260630.xsd#FINANCIALHIGHLIGHTSDetails"/>
  <link:presentationLink xlink:role="http://www.mainstcapital.com/role/FINANCIALHIGHLIGHTSDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentCompanyAbstract_019e2207-0b60-7d1f-85e4-75890949180a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentCompanyAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentCompanyFinancialHighlightsTable_019e2207-0b60-7b7d-97f6-50e17e7c35ea" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentCompanyFinancialHighlightsTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentCompanyAbstract_019e2207-0b60-7d1f-85e4-75890949180a" xlink:to="loc_us-gaap_InvestmentCompanyFinancialHighlightsTable_019e2207-0b60-7b7d-97f6-50e17e7c35ea" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019e2207-0b60-7a61-8168-933ba68fe251" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentCompanyFinancialHighlightsTable_019e2207-0b60-7b7d-97f6-50e17e7c35ea" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019e2207-0b60-7a61-8168-933ba68fe251" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019e2207-0b60-7b09-8c4d-3649cfc99035" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019e2207-0b60-7a61-8168-933ba68fe251" xlink:to="loc_us-gaap_RelatedPartyDomain_019e2207-0b60-7b09-8c4d-3649cfc99035" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyMember_019e2207-0b60-75d6-9b38-5af65df64d26" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RelatedPartyDomain_019e2207-0b60-7b09-8c4d-3649cfc99035" xlink:to="loc_us-gaap_RelatedPartyMember_019e2207-0b60-75d6-9b38-5af65df64d26" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CounterpartyNameAxis_019e2207-0b60-7e51-8075-04de0e78c7b2" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_CounterpartyNameAxis"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentCompanyFinancialHighlightsTable_019e2207-0b60-7b7d-97f6-50e17e7c35ea" xlink:to="loc_srt_CounterpartyNameAxis_019e2207-0b60-7e51-8075-04de0e78c7b2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019e2207-0b60-7e4c-9094-46000d1a0082" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_CounterpartyNameAxis_019e2207-0b60-7e51-8075-04de0e78c7b2" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019e2207-0b60-7e4c-9094-46000d1a0082" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_ExternalInvestmentManagerMember_019e2207-0b60-7729-a74f-cb84a6b1db85" xlink:href="main-20260630.xsd#main_ExternalInvestmentManagerMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019e2207-0b60-7e4c-9094-46000d1a0082" xlink:to="loc_main_ExternalInvestmentManagerMember_019e2207-0b60-7729-a74f-cb84a6b1db85" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentCompanyFinancialHighlightsLineItems_019e2207-0b60-7797-9f8c-764f2777ede8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentCompanyFinancialHighlightsLineItems"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentCompanyFinancialHighlightsTable_019e2207-0b60-7b7d-97f6-50e17e7c35ea" xlink:to="loc_us-gaap_InvestmentCompanyFinancialHighlightsLineItems_019e2207-0b60-7797-9f8c-764f2777ede8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_InvestmentCompanyPerShareDataAbstract_019e2207-0b60-786d-aaf3-d075f7e4f63f" xlink:href="main-20260630.xsd#main_InvestmentCompanyPerShareDataAbstract"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentCompanyFinancialHighlightsLineItems_019e2207-0b60-7797-9f8c-764f2777ede8" xlink:to="loc_main_InvestmentCompanyPerShareDataAbstract_019e2207-0b60-786d-aaf3-d075f7e4f63f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentCompanyFinancialHighlightsRollForward_019e2207-0b60-7e75-aceb-3311ab14e50f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentCompanyFinancialHighlightsRollForward"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_main_InvestmentCompanyPerShareDataAbstract_019e2207-0b60-786d-aaf3-d075f7e4f63f" xlink:to="loc_us-gaap_InvestmentCompanyFinancialHighlightsRollForward_019e2207-0b60-7e75-aceb-3311ab14e50f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetAssetValuePerShare_019e2207-0b60-7c23-9e4b-34dcd988298c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetAssetValuePerShare"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentCompanyFinancialHighlightsRollForward_019e2207-0b60-7e75-aceb-3311ab14e50f" xlink:to="loc_us-gaap_NetAssetValuePerShare_019e2207-0b60-7c23-9e4b-34dcd988298c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/periodStartLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentCompanyInvestmentIncomeLossPerShare_019e2207-0b60-7faf-9a80-3ee46cfa18f3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentCompanyInvestmentIncomeLossPerShare"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentCompanyFinancialHighlightsRollForward_019e2207-0b60-7e75-aceb-3311ab14e50f" xlink:to="loc_us-gaap_InvestmentCompanyInvestmentIncomeLossPerShare_019e2207-0b60-7faf-9a80-3ee46cfa18f3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_InvestmentCompanyNetRealizedGainLossOnInvestmentPerShare_019e2207-0b60-71cb-b854-00bf864e6cc9" xlink:href="main-20260630.xsd#main_InvestmentCompanyNetRealizedGainLossOnInvestmentPerShare"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentCompanyFinancialHighlightsRollForward_019e2207-0b60-7e75-aceb-3311ab14e50f" xlink:to="loc_main_InvestmentCompanyNetRealizedGainLossOnInvestmentPerShare_019e2207-0b60-71cb-b854-00bf864e6cc9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentCompanyUnrealizedGainLossOnInvestmentPerShare_019e2207-0b60-7196-87a1-415a05135ca3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentCompanyUnrealizedGainLossOnInvestmentPerShare"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentCompanyFinancialHighlightsRollForward_019e2207-0b60-7e75-aceb-3311ab14e50f" xlink:to="loc_us-gaap_InvestmentCompanyUnrealizedGainLossOnInvestmentPerShare_019e2207-0b60-7196-87a1-415a05135ca3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_InvestmentCompanyIncomeTaxBenefitProvisionOnNetRealizedGainAndNetUnrealizedAppreciationPerShare_019e2207-0b60-796a-9977-29ba5299ac02" xlink:href="main-20260630.xsd#main_InvestmentCompanyIncomeTaxBenefitProvisionOnNetRealizedGainAndNetUnrealizedAppreciationPerShare"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentCompanyFinancialHighlightsRollForward_019e2207-0b60-7e75-aceb-3311ab14e50f" xlink:to="loc_main_InvestmentCompanyIncomeTaxBenefitProvisionOnNetRealizedGainAndNetUnrealizedAppreciationPerShare_019e2207-0b60-796a-9977-29ba5299ac02" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentCompanyInvestmentIncomeLossFromOperationsPerShare_019e2207-0b60-786e-822e-a0ad8796b93e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentCompanyInvestmentIncomeLossFromOperationsPerShare"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentCompanyFinancialHighlightsRollForward_019e2207-0b60-7e75-aceb-3311ab14e50f" xlink:to="loc_us-gaap_InvestmentCompanyInvestmentIncomeLossFromOperationsPerShare_019e2207-0b60-786e-822e-a0ad8796b93e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_InvestmentCompanyDividendDistributionToShareholdersPerShare_019e2207-0b60-7ba2-b702-e36bf36b9e30" xlink:href="main-20260630.xsd#main_InvestmentCompanyDividendDistributionToShareholdersPerShare"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentCompanyFinancialHighlightsRollForward_019e2207-0b60-7e75-aceb-3311ab14e50f" xlink:to="loc_main_InvestmentCompanyDividendDistributionToShareholdersPerShare_019e2207-0b60-7ba2-b702-e36bf36b9e30" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentCompanyDistributionToShareholdersPerShare_019e2207-0b60-7039-b011-81839799c940" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentCompanyDistributionToShareholdersPerShare"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentCompanyFinancialHighlightsRollForward_019e2207-0b60-7e75-aceb-3311ab14e50f" xlink:to="loc_us-gaap_InvestmentCompanyDistributionToShareholdersPerShare_019e2207-0b60-7039-b011-81839799c940" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedTotalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_InvestmentCompanyEffectOfStockOfferingsPerShare_019e2207-0b60-7570-8472-f47d0088b2d0" xlink:href="main-20260630.xsd#main_InvestmentCompanyEffectOfStockOfferingsPerShare"/>
    <link:presentationArc order="9" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentCompanyFinancialHighlightsRollForward_019e2207-0b60-7e75-aceb-3311ab14e50f" xlink:to="loc_main_InvestmentCompanyEffectOfStockOfferingsPerShare_019e2207-0b60-7570-8472-f47d0088b2d0" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_InvestmentCompanyEffectOfDividendReinvestmentPlanPerShare_019e2207-0b60-7519-82c4-aa3d93671d3a" xlink:href="main-20260630.xsd#main_InvestmentCompanyEffectOfDividendReinvestmentPlanPerShare"/>
    <link:presentationArc order="10" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentCompanyFinancialHighlightsRollForward_019e2207-0b60-7e75-aceb-3311ab14e50f" xlink:to="loc_main_InvestmentCompanyEffectOfDividendReinvestmentPlanPerShare_019e2207-0b60-7519-82c4-aa3d93671d3a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_InvestmentCompanyOtherPerShare_019e2207-0b60-7d92-b34d-74af4c1ada7e" xlink:href="main-20260630.xsd#main_InvestmentCompanyOtherPerShare"/>
    <link:presentationArc order="11" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentCompanyFinancialHighlightsRollForward_019e2207-0b60-7e75-aceb-3311ab14e50f" xlink:to="loc_main_InvestmentCompanyOtherPerShare_019e2207-0b60-7d92-b34d-74af4c1ada7e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetAssetValuePerShare_019e2207-0b60-7d6c-b3c5-b41b768bf4a8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetAssetValuePerShare"/>
    <link:presentationArc order="12" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentCompanyFinancialHighlightsRollForward_019e2207-0b60-7e75-aceb-3311ab14e50f" xlink:to="loc_us-gaap_NetAssetValuePerShare_019e2207-0b60-7d6c-b3c5-b41b768bf4a8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/periodEndLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentCompanyMarketValuePerShare_019e2207-0b60-7055-ab6a-bf4c79b6838f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentCompanyMarketValuePerShare"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentCompanyFinancialHighlightsLineItems_019e2207-0b60-7797-9f8c-764f2777ede8" xlink:to="loc_us-gaap_InvestmentCompanyMarketValuePerShare_019e2207-0b60-7055-ab6a-bf4c79b6838f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_InvestmentCompanyCommonStockSharesOutstanding_019e2207-0b60-7400-b5ba-34ff14999225" xlink:href="main-20260630.xsd#main_InvestmentCompanyCommonStockSharesOutstanding"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentCompanyFinancialHighlightsLineItems_019e2207-0b60-7797-9f8c-764f2777ede8" xlink:to="loc_main_InvestmentCompanyCommonStockSharesOutstanding_019e2207-0b60-7400-b5ba-34ff14999225" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_019e2207-0b60-70b2-85b5-7ebffb760a11" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquity"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentCompanyFinancialHighlightsLineItems_019e2207-0b60-7797-9f8c-764f2777ede8" xlink:to="loc_us-gaap_StockholdersEquity_019e2207-0b60-70b2-85b5-7ebffb760a11" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentCompanyAverageNetAssets_019e2207-0b60-7a49-b5a9-4bc95107e900" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentCompanyAverageNetAssets"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentCompanyFinancialHighlightsLineItems_019e2207-0b60-7797-9f8c-764f2777ede8" xlink:to="loc_us-gaap_InvestmentCompanyAverageNetAssets_019e2207-0b60-7a49-b5a9-4bc95107e900" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtAverageAmountOutstanding_019e2207-0b60-7f26-bf8c-211650988ad2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermDebtAverageAmountOutstanding"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentCompanyFinancialHighlightsLineItems_019e2207-0b60-7797-9f8c-764f2777ede8" xlink:to="loc_us-gaap_LongTermDebtAverageAmountOutstanding_019e2207-0b60-7f26-bf8c-211650988ad2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_InvestmentCompanyRatioToAverageNetAssetsAbstract_019e2207-0b60-7b7e-9220-a6267740b682" xlink:href="main-20260630.xsd#main_InvestmentCompanyRatioToAverageNetAssetsAbstract"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentCompanyFinancialHighlightsLineItems_019e2207-0b60-7797-9f8c-764f2777ede8" xlink:to="loc_main_InvestmentCompanyRatioToAverageNetAssetsAbstract_019e2207-0b60-7b7e-9220-a6267740b682" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_InvestmentCompanyExpenseRatioIncludingIncomeTaxExpense_019e2207-0b60-7b13-b07b-425a2e15fbf5" xlink:href="main-20260630.xsd#main_InvestmentCompanyExpenseRatioIncludingIncomeTaxExpense"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_main_InvestmentCompanyRatioToAverageNetAssetsAbstract_019e2207-0b60-7b7e-9220-a6267740b682" xlink:to="loc_main_InvestmentCompanyExpenseRatioIncludingIncomeTaxExpense_019e2207-0b60-7b13-b07b-425a2e15fbf5" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_InvestmentCompanyOperatingExpensesRatio_019e2207-0b60-7762-9149-5a53acbc3203" xlink:href="main-20260630.xsd#main_InvestmentCompanyOperatingExpensesRatio"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_main_InvestmentCompanyRatioToAverageNetAssetsAbstract_019e2207-0b60-7b7e-9220-a6267740b682" xlink:to="loc_main_InvestmentCompanyOperatingExpensesRatio_019e2207-0b60-7762-9149-5a53acbc3203" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_InvestmentCompanyOperatingExpenseRatioExcludingInterestExpense_019e2207-0b60-7b88-83a2-78259f44aaec" xlink:href="main-20260630.xsd#main_InvestmentCompanyOperatingExpenseRatioExcludingInterestExpense"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_main_InvestmentCompanyRatioToAverageNetAssetsAbstract_019e2207-0b60-7b7e-9220-a6267740b682" xlink:to="loc_main_InvestmentCompanyOperatingExpenseRatioExcludingInterestExpense_019e2207-0b60-7b88-83a2-78259f44aaec" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentCompanyInvestmentIncomeLossRatio_019e2207-0b60-7da2-a863-7c65b0be45d9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentCompanyInvestmentIncomeLossRatio"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_main_InvestmentCompanyRatioToAverageNetAssetsAbstract_019e2207-0b60-7b7e-9220-a6267740b682" xlink:to="loc_us-gaap_InvestmentCompanyInvestmentIncomeLossRatio_019e2207-0b60-7da2-a863-7c65b0be45d9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentCompanyPortfolioTurnover_019e2207-0b60-79c6-b7dd-e958eb235bfd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentCompanyPortfolioTurnover"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_main_InvestmentCompanyRatioToAverageNetAssetsAbstract_019e2207-0b60-7b7e-9220-a6267740b682" xlink:to="loc_us-gaap_InvestmentCompanyPortfolioTurnover_019e2207-0b60-79c6-b7dd-e958eb235bfd" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentCompanyTotalReturnMarketValue_019e2207-0b60-7d61-95ab-45425dda4471" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentCompanyTotalReturnMarketValue"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_main_InvestmentCompanyRatioToAverageNetAssetsAbstract_019e2207-0b60-7b7e-9220-a6267740b682" xlink:to="loc_us-gaap_InvestmentCompanyTotalReturnMarketValue_019e2207-0b60-7d61-95ab-45425dda4471" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentCompanyTotalReturn_019e2207-0b60-793e-a785-74b33171588a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentCompanyTotalReturn"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_main_InvestmentCompanyRatioToAverageNetAssetsAbstract_019e2207-0b60-7b7e-9220-a6267740b682" xlink:to="loc_us-gaap_InvestmentCompanyTotalReturn_019e2207-0b60-793e-a785-74b33171588a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingExpenses_019e2207-0b60-72b2-91ad-f484203f632e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingExpenses"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentCompanyFinancialHighlightsLineItems_019e2207-0b60-7797-9f8c-764f2777ede8" xlink:to="loc_us-gaap_OperatingExpenses_019e2207-0b60-72b2-91ad-f484203f632e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.mainstcapital.com/role/DIVIDENDSDISTRIBUTIONSANDTAXABLEINCOMEScheduleofDividendInformationDetails" xlink:type="simple" xlink:href="main-20260630.xsd#DIVIDENDSDISTRIBUTIONSANDTAXABLEINCOMEScheduleofDividendInformationDetails"/>
  <link:presentationLink xlink:role="http://www.mainstcapital.com/role/DIVIDENDSDISTRIBUTIONSANDTAXABLEINCOMEScheduleofDividendInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxDisclosureAbstract_019e2207-0b60-7c00-9703-19b359943e45" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeTaxDisclosureAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsPayableTable_019e2207-0b60-77a9-8aa5-6dbad7225e9b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DividendsPayableTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_019e2207-0b60-7c00-9703-19b359943e45" xlink:to="loc_us-gaap_DividendsPayableTable_019e2207-0b60-77a9-8aa5-6dbad7225e9b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsAxis_019e2207-0b60-7997-940e-926f140808aa" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DividendsAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DividendsPayableTable_019e2207-0b60-77a9-8aa5-6dbad7225e9b" xlink:to="loc_us-gaap_DividendsAxis_019e2207-0b60-7997-940e-926f140808aa" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsDomain_019e2207-0b60-71e3-aa88-36d68fc77f51" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DividendsDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DividendsAxis_019e2207-0b60-7997-940e-926f140808aa" xlink:to="loc_us-gaap_DividendsDomain_019e2207-0b60-71e3-aa88-36d68fc77f51" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_O2026Q2RegularDividendsMember_019e67f7-997a-7627-b031-f8b6e006ef97" xlink:href="main-20260630.xsd#main_O2026Q2RegularDividendsMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DividendsDomain_019e2207-0b60-71e3-aa88-36d68fc77f51" xlink:to="loc_main_O2026Q2RegularDividendsMember_019e67f7-997a-7627-b031-f8b6e006ef97" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_O2025Q2RegularDividendsMember_019e67f8-c836-7fa4-95ac-595b8cf6358b" xlink:href="main-20260630.xsd#main_O2025Q2RegularDividendsMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DividendsDomain_019e2207-0b60-71e3-aa88-36d68fc77f51" xlink:to="loc_main_O2025Q2RegularDividendsMember_019e67f8-c836-7fa4-95ac-595b8cf6358b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_O2026A2RegularDividendsMember_019e67fa-5201-730a-843f-a9dce86c19d9" xlink:href="main-20260630.xsd#main_O2026A2RegularDividendsMember"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DividendsDomain_019e2207-0b60-71e3-aa88-36d68fc77f51" xlink:to="loc_main_O2026A2RegularDividendsMember_019e67fa-5201-730a-843f-a9dce86c19d9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_O2025A2RegularDividendsMember_019e67fa-0c67-7a03-b3f3-a569d5ea26a7" xlink:href="main-20260630.xsd#main_O2025A2RegularDividendsMember"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DividendsDomain_019e2207-0b60-71e3-aa88-36d68fc77f51" xlink:to="loc_main_O2025A2RegularDividendsMember_019e67fa-0c67-7a03-b3f3-a569d5ea26a7" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_O2026Q2SupplementalDividendsMember_019e2207-0b60-70b2-9a33-e7c98c9a2082" xlink:href="main-20260630.xsd#main_O2026Q2SupplementalDividendsMember"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DividendsDomain_019e2207-0b60-71e3-aa88-36d68fc77f51" xlink:to="loc_main_O2026Q2SupplementalDividendsMember_019e2207-0b60-70b2-9a33-e7c98c9a2082" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_O2025Q2SupplementalDividendsMember_019e67fb-cec9-70b8-9605-01978ddca539" xlink:href="main-20260630.xsd#main_O2025Q2SupplementalDividendsMember"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DividendsDomain_019e2207-0b60-71e3-aa88-36d68fc77f51" xlink:to="loc_main_O2025Q2SupplementalDividendsMember_019e67fb-cec9-70b8-9605-01978ddca539" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_O2026A2SupplementalDividendsMember_019e67fc-9e88-7b29-9911-e001953d282f" xlink:href="main-20260630.xsd#main_O2026A2SupplementalDividendsMember"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DividendsDomain_019e2207-0b60-71e3-aa88-36d68fc77f51" xlink:to="loc_main_O2026A2SupplementalDividendsMember_019e67fc-9e88-7b29-9911-e001953d282f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_O2025A2SupplementalDividendsMember_019e67fc-3ea0-72f1-967c-10546fe79f4e" xlink:href="main-20260630.xsd#main_O2025A2SupplementalDividendsMember"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DividendsDomain_019e2207-0b60-71e3-aa88-36d68fc77f51" xlink:to="loc_main_O2025A2SupplementalDividendsMember_019e67fc-3ea0-72f1-967c-10546fe79f4e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsPayableLineItems_019e2207-0b60-7afc-b7dd-d5b0d851c6e9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DividendsPayableLineItems"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DividendsPayableTable_019e2207-0b60-77a9-8aa5-6dbad7225e9b" xlink:to="loc_us-gaap_DividendsPayableLineItems_019e2207-0b60-7afc-b7dd-d5b0d851c6e9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockDividendsPerShareCashPaid_019e2207-0b60-7f2a-8a3a-5dbaca61f1c5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockDividendsPerShareCashPaid"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DividendsPayableLineItems_019e2207-0b60-7afc-b7dd-d5b0d851c6e9" xlink:to="loc_us-gaap_CommonStockDividendsPerShareCashPaid_019e2207-0b60-7f2a-8a3a-5dbaca61f1c5" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfDividendsCommonStock_019e2207-0b60-7d5f-a155-fc2e3eb3a30b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsOfDividendsCommonStock"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DividendsPayableLineItems_019e2207-0b60-7afc-b7dd-d5b0d851c6e9" xlink:to="loc_us-gaap_PaymentsOfDividendsCommonStock_019e2207-0b60-7d5f-a155-fc2e3eb3a30b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.mainstcapital.com/role/DIVIDENDSDISTRIBUTIONSANDTAXABLEINCOMEScheduleofReconciliationtoTaxableIncomeandtoTotalDistributionsDeclaredtoCommonStockholdersDetails" xlink:type="simple" xlink:href="main-20260630.xsd#DIVIDENDSDISTRIBUTIONSANDTAXABLEINCOMEScheduleofReconciliationtoTaxableIncomeandtoTotalDistributionsDeclaredtoCommonStockholdersDetails"/>
  <link:presentationLink xlink:role="http://www.mainstcapital.com/role/DIVIDENDSDISTRIBUTIONSANDTAXABLEINCOMEScheduleofReconciliationtoTaxableIncomeandtoTotalDistributionsDeclaredtoCommonStockholdersDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxDisclosureAbstract_019e2207-0b60-7ad1-94c7-e9b0a392e852" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeTaxDisclosureAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_019e2207-0b60-75a0-8cb8-a331e98b7275" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLoss"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_019e2207-0b60-7ad1-94c7-e9b0a392e852" xlink:to="loc_us-gaap_NetIncomeLoss_019e2207-0b60-75a0-8cb8-a331e98b7275" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_InvestmentCompanyTaxBasisBookTaxDifferenceFromShareBasedCompensationExpenseIncreaseDecreaseInTaxableIncome_019e2207-0b60-7b46-bc98-0b6cd9af2397" xlink:href="main-20260630.xsd#main_InvestmentCompanyTaxBasisBookTaxDifferenceFromShareBasedCompensationExpenseIncreaseDecreaseInTaxableIncome"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_019e2207-0b60-7ad1-94c7-e9b0a392e852" xlink:to="loc_main_InvestmentCompanyTaxBasisBookTaxDifferenceFromShareBasedCompensationExpenseIncreaseDecreaseInTaxableIncome_019e2207-0b60-7b46-bc98-0b6cd9af2397" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentCompanyTaxBasisUnrealizedGainLossNotCurrentlyTaxableDeductible_019e2207-0b60-7c3e-8fe4-f607d64f1364" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentCompanyTaxBasisUnrealizedGainLossNotCurrentlyTaxableDeductible"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_019e2207-0b60-7ad1-94c7-e9b0a392e852" xlink:to="loc_us-gaap_InvestmentCompanyTaxBasisUnrealizedGainLossNotCurrentlyTaxableDeductible_019e2207-0b60-7c3e-8fe4-f607d64f1364" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_InvestmentCompanyTaxBasisIncomeTaxProvision_019e2207-0b60-71a2-b576-bd2be92da1af" xlink:href="main-20260630.xsd#main_InvestmentCompanyTaxBasisIncomeTaxProvision"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_019e2207-0b60-7ad1-94c7-e9b0a392e852" xlink:to="loc_main_InvestmentCompanyTaxBasisIncomeTaxProvision_019e2207-0b60-71a2-b576-bd2be92da1af" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_InvestmentCompanyTaxBasisPreTaxBookIncomeLossNotConsolidatedForTaxPurposesIncreaseDecreaseInTaxableIncome_019e2207-0b60-7e3a-ada8-7df1452615bf" xlink:href="main-20260630.xsd#main_InvestmentCompanyTaxBasisPreTaxBookIncomeLossNotConsolidatedForTaxPurposesIncreaseDecreaseInTaxableIncome"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_019e2207-0b60-7ad1-94c7-e9b0a392e852" xlink:to="loc_main_InvestmentCompanyTaxBasisPreTaxBookIncomeLossNotConsolidatedForTaxPurposesIncreaseDecreaseInTaxableIncome_019e2207-0b60-7e3a-ada8-7df1452615bf" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_InvestmentCompanyTaxBasisBookIncomeAndTaxIncomeDifferencesIncreaseDecreaseInTaxableIncome_019e2207-0b60-7573-bf1e-e2966c87aff2" xlink:href="main-20260630.xsd#main_InvestmentCompanyTaxBasisBookIncomeAndTaxIncomeDifferencesIncreaseDecreaseInTaxableIncome"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_019e2207-0b60-7ad1-94c7-e9b0a392e852" xlink:to="loc_main_InvestmentCompanyTaxBasisBookIncomeAndTaxIncomeDifferencesIncreaseDecreaseInTaxableIncome_019e2207-0b60-7573-bf1e-e2966c87aff2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_InvestmentCompanyTaxBasisNetIncomeLossAttributableToParentEstimated_019e2207-0b60-7dae-b89a-e1f7af54afc9" xlink:href="main-20260630.xsd#main_InvestmentCompanyTaxBasisNetIncomeLossAttributableToParentEstimated"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_019e2207-0b60-7ad1-94c7-e9b0a392e852" xlink:to="loc_main_InvestmentCompanyTaxBasisNetIncomeLossAttributableToParentEstimated_019e2207-0b60-7dae-b89a-e1f7af54afc9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_InvestmentCompanyTaxBasisTaxableIncomeEarnedInPriorYearAndCarriedForwardForDistributionInCurrentYear_019e2207-0b60-72de-9b9f-c2b2d7b62a1b" xlink:href="main-20260630.xsd#main_InvestmentCompanyTaxBasisTaxableIncomeEarnedInPriorYearAndCarriedForwardForDistributionInCurrentYear"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_019e2207-0b60-7ad1-94c7-e9b0a392e852" xlink:to="loc_main_InvestmentCompanyTaxBasisTaxableIncomeEarnedInPriorYearAndCarriedForwardForDistributionInCurrentYear_019e2207-0b60-72de-9b9f-c2b2d7b62a1b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_InvestmentCompanyTaxBasisTaxableIncomeEarnedPriorToPeriodEndAndCarriedForwardForDistributionNextPeriod_019e2207-0b60-7296-9ab7-f89bab806bbb" xlink:href="main-20260630.xsd#main_InvestmentCompanyTaxBasisTaxableIncomeEarnedPriorToPeriodEndAndCarriedForwardForDistributionNextPeriod"/>
    <link:presentationArc order="9" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_019e2207-0b60-7ad1-94c7-e9b0a392e852" xlink:to="loc_main_InvestmentCompanyTaxBasisTaxableIncomeEarnedPriorToPeriodEndAndCarriedForwardForDistributionNextPeriod_019e2207-0b60-7296-9ab7-f89bab806bbb" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_InvestmentCompanyTaxBasisDividendsPaidOrPayable_019e2207-0b60-785a-b226-53a730ad9dff" xlink:href="main-20260630.xsd#main_InvestmentCompanyTaxBasisDividendsPaidOrPayable"/>
    <link:presentationArc order="10" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_019e2207-0b60-7ad1-94c7-e9b0a392e852" xlink:to="loc_main_InvestmentCompanyTaxBasisDividendsPaidOrPayable_019e2207-0b60-785a-b226-53a730ad9dff" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_InvestmentCompanyTaxBasisDistributionsAccruedOrPaidToCommonStockholders_019e2207-0b60-7ab6-adcb-7c9bd69b6273" xlink:href="main-20260630.xsd#main_InvestmentCompanyTaxBasisDistributionsAccruedOrPaidToCommonStockholders"/>
    <link:presentationArc order="11" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_019e2207-0b60-7ad1-94c7-e9b0a392e852" xlink:to="loc_main_InvestmentCompanyTaxBasisDistributionsAccruedOrPaidToCommonStockholders_019e2207-0b60-7ab6-adcb-7c9bd69b6273" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.mainstcapital.com/role/DIVIDENDSDISTRIBUTIONSANDTAXABLEINCOMEScheduleofNetInvestmentIncomeRelatedTaxesDetails" xlink:type="simple" xlink:href="main-20260630.xsd#DIVIDENDSDISTRIBUTIONSANDTAXABLEINCOMEScheduleofNetInvestmentIncomeRelatedTaxesDetails"/>
  <link:presentationLink xlink:role="http://www.mainstcapital.com/role/DIVIDENDSDISTRIBUTIONSANDTAXABLEINCOMEScheduleofNetInvestmentIncomeRelatedTaxesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxDisclosureAbstract_019e2207-0b60-75f0-87b1-88ff190f357f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeTaxDisclosureAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_NetInvestmentIncomeTaxExpenseBenefitAbstract_019e2207-0b60-78b2-a634-c6fb2a8d310f" xlink:href="main-20260630.xsd#main_NetInvestmentIncomeTaxExpenseBenefitAbstract"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_019e2207-0b60-75f0-87b1-88ff190f357f" xlink:to="loc_main_NetInvestmentIncomeTaxExpenseBenefitAbstract_019e2207-0b60-78b2-a634-c6fb2a8d310f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CurrentFederalStateAndLocalTaxExpenseBenefitAbstract_019e2207-0b60-7efd-9602-d383b94e5d82" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CurrentFederalStateAndLocalTaxExpenseBenefitAbstract"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_main_NetInvestmentIncomeTaxExpenseBenefitAbstract_019e2207-0b60-78b2-a634-c6fb2a8d310f" xlink:to="loc_us-gaap_CurrentFederalStateAndLocalTaxExpenseBenefitAbstract_019e2207-0b60-7efd-9602-d383b94e5d82" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_InvestmentIncomeOperatingFederalTaxExpenseBenefitCurrent_019e2207-0b60-70a4-bef4-5944b29474f2" xlink:href="main-20260630.xsd#main_InvestmentIncomeOperatingFederalTaxExpenseBenefitCurrent"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CurrentFederalStateAndLocalTaxExpenseBenefitAbstract_019e2207-0b60-7efd-9602-d383b94e5d82" xlink:to="loc_main_InvestmentIncomeOperatingFederalTaxExpenseBenefitCurrent_019e2207-0b60-70a4-bef4-5944b29474f2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_InvestmentIncomeOperatingStateAndOtherTaxExpenseBenefitCurrent_019e2207-0b60-72bb-b01d-7949a1322178" xlink:href="main-20260630.xsd#main_InvestmentIncomeOperatingStateAndOtherTaxExpenseBenefitCurrent"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CurrentFederalStateAndLocalTaxExpenseBenefitAbstract_019e2207-0b60-7efd-9602-d383b94e5d82" xlink:to="loc_main_InvestmentIncomeOperatingStateAndOtherTaxExpenseBenefitCurrent_019e2207-0b60-72bb-b01d-7949a1322178" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentCompanyExciseTaxExpense_019e2207-0b60-775d-8763-95e94545433d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentCompanyExciseTaxExpense"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CurrentFederalStateAndLocalTaxExpenseBenefitAbstract_019e2207-0b60-7efd-9602-d383b94e5d82" xlink:to="loc_us-gaap_InvestmentCompanyExciseTaxExpense_019e2207-0b60-775d-8763-95e94545433d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_InvestmentIncomeOperatingTaxExpenseBenefitCurrent_019e2207-0b60-79e9-8417-aa0cad29b32a" xlink:href="main-20260630.xsd#main_InvestmentIncomeOperatingTaxExpenseBenefitCurrent"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CurrentFederalStateAndLocalTaxExpenseBenefitAbstract_019e2207-0b60-7efd-9602-d383b94e5d82" xlink:to="loc_main_InvestmentIncomeOperatingTaxExpenseBenefitCurrent_019e2207-0b60-79e9-8417-aa0cad29b32a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_DeferredTaxExpenseIncomeAbstract_019e2207-0b60-7fea-ad23-325d99bebe7e" xlink:href="main-20260630.xsd#main_DeferredTaxExpenseIncomeAbstract"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_main_NetInvestmentIncomeTaxExpenseBenefitAbstract_019e2207-0b60-78b2-a634-c6fb2a8d310f" xlink:to="loc_main_DeferredTaxExpenseIncomeAbstract_019e2207-0b60-7fea-ad23-325d99bebe7e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_InvestmentIncomeOperatingDeferredFederalTaxExpenseBenefit_019e2207-0b60-7410-9296-fa923dc7951e" xlink:href="main-20260630.xsd#main_InvestmentIncomeOperatingDeferredFederalTaxExpenseBenefit"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_main_DeferredTaxExpenseIncomeAbstract_019e2207-0b60-7fea-ad23-325d99bebe7e" xlink:to="loc_main_InvestmentIncomeOperatingDeferredFederalTaxExpenseBenefit_019e2207-0b60-7410-9296-fa923dc7951e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_InvestmentIncomeOperatingDeferredStateAndOtherTaxExpenseBenefit_019e2207-0b60-75d1-b465-d5c73427ba82" xlink:href="main-20260630.xsd#main_InvestmentIncomeOperatingDeferredStateAndOtherTaxExpenseBenefit"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_main_DeferredTaxExpenseIncomeAbstract_019e2207-0b60-7fea-ad23-325d99bebe7e" xlink:to="loc_main_InvestmentIncomeOperatingDeferredStateAndOtherTaxExpenseBenefit_019e2207-0b60-75d1-b465-d5c73427ba82" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_InvestmentIncomeOperatingDeferredTaxExpenseBenefit_019e2207-0b60-74d7-8a79-f31b8c6fcecb" xlink:href="main-20260630.xsd#main_InvestmentIncomeOperatingDeferredTaxExpenseBenefit"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_main_DeferredTaxExpenseIncomeAbstract_019e2207-0b60-7fea-ad23-325d99bebe7e" xlink:to="loc_main_InvestmentIncomeOperatingDeferredTaxExpenseBenefit_019e2207-0b60-74d7-8a79-f31b8c6fcecb" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentIncomeOperatingTaxExpenseBenefit_019e2207-0b60-7afd-8bc4-5046a07b0c8d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentIncomeOperatingTaxExpenseBenefit"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_main_NetInvestmentIncomeTaxExpenseBenefitAbstract_019e2207-0b60-78b2-a634-c6fb2a8d310f" xlink:to="loc_us-gaap_InvestmentIncomeOperatingTaxExpenseBenefit_019e2207-0b60-7afd-8bc4-5046a07b0c8d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_InvestmentTaxExpenseIncomeAbstract_019e2207-0b60-7ac8-aa0c-6cc04319baf6" xlink:href="main-20260630.xsd#main_InvestmentTaxExpenseIncomeAbstract"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_019e2207-0b60-75f0-87b1-88ff190f357f" xlink:to="loc_main_InvestmentTaxExpenseIncomeAbstract_019e2207-0b60-7ac8-aa0c-6cc04319baf6" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_InvestmentTaxExpenseIncomeCurrentAbstract_019e2207-0b60-76fb-bbf1-30ab4d0bb391" xlink:href="main-20260630.xsd#main_InvestmentTaxExpenseIncomeCurrentAbstract"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_main_InvestmentTaxExpenseIncomeAbstract_019e2207-0b60-7ac8-aa0c-6cc04319baf6" xlink:to="loc_main_InvestmentTaxExpenseIncomeCurrentAbstract_019e2207-0b60-76fb-bbf1-30ab4d0bb391" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_RealizedGainLossInvestmentAndDerivativeOperatingFederalTaxExpenseBenefitCurrent_019e2207-0b60-7dca-b7d2-7506ab5314c6" xlink:href="main-20260630.xsd#main_RealizedGainLossInvestmentAndDerivativeOperatingFederalTaxExpenseBenefitCurrent"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_main_InvestmentTaxExpenseIncomeCurrentAbstract_019e2207-0b60-76fb-bbf1-30ab4d0bb391" xlink:to="loc_main_RealizedGainLossInvestmentAndDerivativeOperatingFederalTaxExpenseBenefitCurrent_019e2207-0b60-7dca-b7d2-7506ab5314c6" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_RealizedGainLossInvestmentAndDerivativeOperatingTaxExpenseBenefitCurrent_019e2207-0b60-7753-8d3a-aa4f83efaaa6" xlink:href="main-20260630.xsd#main_RealizedGainLossInvestmentAndDerivativeOperatingTaxExpenseBenefitCurrent"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_main_InvestmentTaxExpenseIncomeCurrentAbstract_019e2207-0b60-76fb-bbf1-30ab4d0bb391" xlink:to="loc_main_RealizedGainLossInvestmentAndDerivativeOperatingTaxExpenseBenefitCurrent_019e2207-0b60-7753-8d3a-aa4f83efaaa6" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_InvestmentTaxExpenseIncomeDeferredAbstract_019e2207-0b60-72d5-a0e3-d11199104c90" xlink:href="main-20260630.xsd#main_InvestmentTaxExpenseIncomeDeferredAbstract"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_main_InvestmentTaxExpenseIncomeAbstract_019e2207-0b60-7ac8-aa0c-6cc04319baf6" xlink:to="loc_main_InvestmentTaxExpenseIncomeDeferredAbstract_019e2207-0b60-72d5-a0e3-d11199104c90" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_RealizedGainLossInvestmentAndDerivativeOperatingDeferredFederalTaxExpenseBenefit_019e2207-0b60-762c-bfc5-3fd681356025" xlink:href="main-20260630.xsd#main_RealizedGainLossInvestmentAndDerivativeOperatingDeferredFederalTaxExpenseBenefit"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_main_InvestmentTaxExpenseIncomeDeferredAbstract_019e2207-0b60-72d5-a0e3-d11199104c90" xlink:to="loc_main_RealizedGainLossInvestmentAndDerivativeOperatingDeferredFederalTaxExpenseBenefit_019e2207-0b60-762c-bfc5-3fd681356025" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_RealizedGainLossInvestmentAndDerivativeOperatingDeferredStateAndOtherTaxExpenseBenefit_019e2207-0b60-7294-b8c1-f686970cd054" xlink:href="main-20260630.xsd#main_RealizedGainLossInvestmentAndDerivativeOperatingDeferredStateAndOtherTaxExpenseBenefit"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_main_InvestmentTaxExpenseIncomeDeferredAbstract_019e2207-0b60-72d5-a0e3-d11199104c90" xlink:to="loc_main_RealizedGainLossInvestmentAndDerivativeOperatingDeferredStateAndOtherTaxExpenseBenefit_019e2207-0b60-7294-b8c1-f686970cd054" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_RealizedGainLossInvestmentAndDerivativeOperatingDeferredTaxExpenseBenefit_019e2207-0b60-7c64-9f64-69042233259e" xlink:href="main-20260630.xsd#main_RealizedGainLossInvestmentAndDerivativeOperatingDeferredTaxExpenseBenefit"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_main_InvestmentTaxExpenseIncomeDeferredAbstract_019e2207-0b60-72d5-a0e3-d11199104c90" xlink:to="loc_main_RealizedGainLossInvestmentAndDerivativeOperatingDeferredTaxExpenseBenefit_019e2207-0b60-7c64-9f64-69042233259e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealizedGainLossInvestmentAndDerivativeOperatingTaxExpenseBenefit_019e2207-0b60-79f7-bd5d-949ee364cd74" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RealizedGainLossInvestmentAndDerivativeOperatingTaxExpenseBenefit"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_main_InvestmentTaxExpenseIncomeAbstract_019e2207-0b60-7ac8-aa0c-6cc04319baf6" xlink:to="loc_us-gaap_RealizedGainLossInvestmentAndDerivativeOperatingTaxExpenseBenefit_019e2207-0b60-79f7-bd5d-949ee364cd74" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_InvestmentCompanyIncomeTaxExpenseBenefit_019e2207-0b60-73ff-9162-dc2a1ca99c02" xlink:href="main-20260630.xsd#main_InvestmentCompanyIncomeTaxExpenseBenefit"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_019e2207-0b60-75f0-87b1-88ff190f357f" xlink:to="loc_main_InvestmentCompanyIncomeTaxExpenseBenefit_019e2207-0b60-73ff-9162-dc2a1ca99c02" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.mainstcapital.com/role/DIVIDENDSDISTRIBUTIONSANDTAXABLEINCOMENarrativeDetails" xlink:type="simple" xlink:href="main-20260630.xsd#DIVIDENDSDISTRIBUTIONSANDTAXABLEINCOMENarrativeDetails"/>
  <link:presentationLink xlink:role="http://www.mainstcapital.com/role/DIVIDENDSDISTRIBUTIONSANDTAXABLEINCOMENarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxDisclosureAbstract_019e2207-0b60-7064-a466-297cab402051" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeTaxDisclosureAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxLiabilities_019e2207-0b60-7332-ae82-a62b0bc03740" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DeferredTaxLiabilities"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_019e2207-0b60-7064-a466-297cab402051" xlink:to="loc_us-gaap_DeferredTaxLiabilities_019e2207-0b60-7332-ae82-a62b0bc03740" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentCompanyDistributableEarningsLossAccumulatedCapitalLossCarryforward_019e2207-0b60-7634-82fc-8668227cfc85" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentCompanyDistributableEarningsLossAccumulatedCapitalLossCarryforward"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_019e2207-0b60-7064-a466-297cab402051" xlink:to="loc_us-gaap_InvestmentCompanyDistributableEarningsLossAccumulatedCapitalLossCarryforward_019e2207-0b60-7634-82fc-8668227cfc85" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.mainstcapital.com/role/COMMONSTOCKDetails" xlink:type="simple" xlink:href="main-20260630.xsd#COMMONSTOCKDetails"/>
  <link:presentationLink xlink:role="http://www.mainstcapital.com/role/COMMONSTOCKDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityAbstract_019e2207-0b60-72e7-8c62-ce04778bf631" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsidiaryOrEquityMethodInvesteeSaleOfStockBySubsidiaryOrEquityInvesteeTable_019e2207-0b60-7c36-af73-fb1949ae85cd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsidiaryOrEquityMethodInvesteeSaleOfStockBySubsidiaryOrEquityInvesteeTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityAbstract_019e2207-0b60-72e7-8c62-ce04778bf631" xlink:to="loc_us-gaap_SubsidiaryOrEquityMethodInvesteeSaleOfStockBySubsidiaryOrEquityInvesteeTable_019e2207-0b60-7c36-af73-fb1949ae85cd" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsidiarySaleOfStockAxis_019e2207-0b60-71c9-8998-0d005183470d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsidiarySaleOfStockAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SubsidiaryOrEquityMethodInvesteeSaleOfStockBySubsidiaryOrEquityInvesteeTable_019e2207-0b60-7c36-af73-fb1949ae85cd" xlink:to="loc_us-gaap_SubsidiarySaleOfStockAxis_019e2207-0b60-71c9-8998-0d005183470d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019e2207-0b60-7a35-91ec-031d82bcd385" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SaleOfStockNameOfTransactionDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SubsidiarySaleOfStockAxis_019e2207-0b60-71c9-8998-0d005183470d" xlink:to="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019e2207-0b60-7a35-91ec-031d82bcd385" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_AtTheMarketOfferingsMember_019e2207-0b60-76f9-b9c3-4aa4e51715cf" xlink:href="main-20260630.xsd#main_AtTheMarketOfferingsMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019e2207-0b60-7a35-91ec-031d82bcd385" xlink:to="loc_main_AtTheMarketOfferingsMember_019e2207-0b60-76f9-b9c3-4aa4e51715cf" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019e2207-0b60-7143-84c3-efc3e6975e93" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeAxis"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SubsidiaryOrEquityMethodInvesteeSaleOfStockBySubsidiaryOrEquityInvesteeTable_019e2207-0b60-7c36-af73-fb1949ae85cd" xlink:to="loc_srt_RangeAxis_019e2207-0b60-7143-84c3-efc3e6975e93" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019e2207-0b60-7eee-8092-aeb83cb9ee2e" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeAxis_019e2207-0b60-7143-84c3-efc3e6975e93" xlink:to="loc_srt_RangeMember_019e2207-0b60-7eee-8092-aeb83cb9ee2e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_WeightedAverageMember_019e2207-0b60-7f36-95e9-1a2bd7221a86" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_WeightedAverageMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeMember_019e2207-0b60-7eee-8092-aeb83cb9ee2e" xlink:to="loc_srt_WeightedAverageMember_019e2207-0b60-7f36-95e9-1a2bd7221a86" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsidiarySaleOfStockLineItems_019e2207-0b60-7ee3-812d-0de89c1887cc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsidiarySaleOfStockLineItems"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SubsidiaryOrEquityMethodInvesteeSaleOfStockBySubsidiaryOrEquityInvesteeTable_019e2207-0b60-7c36-af73-fb1949ae85cd" xlink:to="loc_us-gaap_SubsidiarySaleOfStockLineItems_019e2207-0b60-7ee3-812d-0de89c1887cc" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_SaleOfStockSharesAuthorizedUnderAgreement_019e2207-0b60-75b4-88b0-f3452b9a3043" xlink:href="main-20260630.xsd#main_SaleOfStockSharesAuthorizedUnderAgreement"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SubsidiarySaleOfStockLineItems_019e2207-0b60-7ee3-812d-0de89c1887cc" xlink:to="loc_main_SaleOfStockSharesAuthorizedUnderAgreement_019e2207-0b60-75b4-88b0-f3452b9a3043" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction_019e2207-0b60-7f72-a286-1918af979142" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SubsidiarySaleOfStockLineItems_019e2207-0b60-7ee3-812d-0de89c1887cc" xlink:to="loc_us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction_019e2207-0b60-7f72-a286-1918af979142" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockPricePerShare_019e2207-0b60-7aa8-92a3-69e94054d1b9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SaleOfStockPricePerShare"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SubsidiarySaleOfStockLineItems_019e2207-0b60-7ee3-812d-0de89c1887cc" xlink:to="loc_us-gaap_SaleOfStockPricePerShare_019e2207-0b60-7aa8-92a3-69e94054d1b9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfCommonStock_019e2207-0b60-7cba-aafb-cb1ace6f43eb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromIssuanceOfCommonStock"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SubsidiarySaleOfStockLineItems_019e2207-0b60-7ee3-812d-0de89c1887cc" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfCommonStock_019e2207-0b60-7cba-aafb-cb1ace6f43eb" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockConsiderationReceivedOnTransaction_019e2207-0b60-7cd6-9f0b-aaf18c19ac6a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SaleOfStockConsiderationReceivedOnTransaction"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SubsidiarySaleOfStockLineItems_019e2207-0b60-7ee3-812d-0de89c1887cc" xlink:to="loc_us-gaap_SaleOfStockConsiderationReceivedOnTransaction_019e2207-0b60-7cd6-9f0b-aaf18c19ac6a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_SaleOfStockSharesNotYetSettled_019e2207-0b60-72ec-a898-2a6c68d6b3c7" xlink:href="main-20260630.xsd#main_SaleOfStockSharesNotYetSettled"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SubsidiarySaleOfStockLineItems_019e2207-0b60-7ee3-812d-0de89c1887cc" xlink:to="loc_main_SaleOfStockSharesNotYetSettled_019e2207-0b60-72ec-a898-2a6c68d6b3c7" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_SaleOfStockRemainingNumberOfSharesAuthorizedToBePurchased_019e2207-0b60-7e58-ab69-b7dcdc7aca6e" xlink:href="main-20260630.xsd#main_SaleOfStockRemainingNumberOfSharesAuthorizedToBePurchased"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SubsidiarySaleOfStockLineItems_019e2207-0b60-7ee3-812d-0de89c1887cc" xlink:to="loc_main_SaleOfStockRemainingNumberOfSharesAuthorizedToBePurchased_019e2207-0b60-7e58-ab69-b7dcdc7aca6e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.mainstcapital.com/role/DIVIDENDREINVESTMENTPLANDetails" xlink:type="simple" xlink:href="main-20260630.xsd#DIVIDENDREINVESTMENTPLANDetails"/>
  <link:presentationLink xlink:role="http://www.mainstcapital.com/role/DIVIDENDREINVESTMENTPLANDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityAbstract_019e2207-0c30-7acc-9243-cb580b01f708" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueDividendReinvestmentPlan_019e2207-0c30-7dbd-a2b1-315eb73ea01d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodValueDividendReinvestmentPlan"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityAbstract_019e2207-0c30-7acc-9243-cb580b01f708" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueDividendReinvestmentPlan_019e2207-0c30-7dbd-a2b1-315eb73ea01d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan_019e2207-0c30-7d78-8dae-56e495df4b64" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityAbstract_019e2207-0c30-7acc-9243-cb580b01f708" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan_019e2207-0c30-7d78-8dae-56e495df4b64" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.mainstcapital.com/role/SHAREBASEDCOMPENSATIONNarrativeDetails" xlink:type="simple" xlink:href="main-20260630.xsd#SHAREBASEDCOMPENSATIONNarrativeDetails"/>
  <link:presentationLink xlink:role="http://www.mainstcapital.com/role/SHAREBASEDCOMPENSATIONNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_019e2207-0c30-7b1d-be1d-c971d2516c59" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019e2207-0c30-759a-a3f3-dca803e36477" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_019e2207-0c30-7b1d-be1d-c971d2516c59" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019e2207-0c30-759a-a3f3-dca803e36477" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_019e2207-0c30-7492-a26c-eafbd24afd0f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AwardTypeAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019e2207-0c30-759a-a3f3-dca803e36477" xlink:to="loc_us-gaap_AwardTypeAxis_019e2207-0c30-7492-a26c-eafbd24afd0f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019e2207-0c30-79d1-9223-91b12947c8cb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AwardTypeAxis_019e2207-0c30-7492-a26c-eafbd24afd0f" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019e2207-0c30-79d1-9223-91b12947c8cb" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockMember_019e2207-0c30-730c-8375-d046e577f8ab" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestrictedStockMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019e2207-0c30-79d1-9223-91b12947c8cb" xlink:to="loc_us-gaap_RestrictedStockMember_019e2207-0c30-730c-8375-d046e577f8ab" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameAxis_019e2207-0c30-7107-8123-c4cd324d7f5a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PlanNameAxis"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019e2207-0c30-759a-a3f3-dca803e36477" xlink:to="loc_us-gaap_PlanNameAxis_019e2207-0c30-7107-8123-c4cd324d7f5a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_019e2207-0c30-7081-974f-7e53b1430d12" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PlanNameDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PlanNameAxis_019e2207-0c30-7107-8123-c4cd324d7f5a" xlink:to="loc_us-gaap_PlanNameDomain_019e2207-0c30-7081-974f-7e53b1430d12" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_MainStreetCapitalCorporation2022EquityAndIncentivePlanMember_019e2207-0c30-7c12-9548-490835813ce4" xlink:href="main-20260630.xsd#main_MainStreetCapitalCorporation2022EquityAndIncentivePlanMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PlanNameDomain_019e2207-0c30-7081-974f-7e53b1430d12" xlink:to="loc_main_MainStreetCapitalCorporation2022EquityAndIncentivePlanMember_019e2207-0c30-7c12-9548-490835813ce4" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019e2207-0c30-7586-b75f-1bc8cf05609f" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeAxis"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019e2207-0c30-759a-a3f3-dca803e36477" xlink:to="loc_srt_RangeAxis_019e2207-0c30-7586-b75f-1bc8cf05609f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019e2207-0c30-75fc-b225-cb044292b756" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeAxis_019e2207-0c30-7586-b75f-1bc8cf05609f" xlink:to="loc_srt_RangeMember_019e2207-0c30-75fc-b225-cb044292b756" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019e2207-0c30-7db9-a636-e59dd4b7e6b7" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MinimumMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeMember_019e2207-0c30-75fc-b225-cb044292b756" xlink:to="loc_srt_MinimumMember_019e2207-0c30-7db9-a636-e59dd4b7e6b7" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019e2207-0c30-76c1-84bd-6ca55bf5ee91" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MaximumMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeMember_019e2207-0c30-75fc-b225-cb044292b756" xlink:to="loc_srt_MaximumMember_019e2207-0c30-76c1-84bd-6ca55bf5ee91" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e2207-0c30-7f07-af52-31e37bd6d3bd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019e2207-0c30-759a-a3f3-dca803e36477" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e2207-0c30-7f07-af52-31e37bd6d3bd" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_019e2207-0c30-7d09-8644-c88a041c56fb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e2207-0c30-7f07-af52-31e37bd6d3bd" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_019e2207-0c30-7d09-8644-c88a041c56fb" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_019e2207-0c30-7916-ad54-35926361c533" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AllocatedShareBasedCompensationExpense"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e2207-0c30-7f07-af52-31e37bd6d3bd" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_019e2207-0c30-7916-ad54-35926361c533" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions_019e2207-0c30-71d5-a1f1-138b138acdd6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e2207-0c30-7f07-af52-31e37bd6d3bd" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions_019e2207-0c30-71d5-a1f1-138b138acdd6" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_019e2207-0c30-7264-bb01-eaf60e1524e8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e2207-0c30-7f07-af52-31e37bd6d3bd" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_019e2207-0c30-7264-bb01-eaf60e1524e8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.mainstcapital.com/role/SHAREBASEDCOMPENSATIONScheduleofRestrictedStockAuthorizedandAvailableforIssuanceDetails" xlink:type="simple" xlink:href="main-20260630.xsd#SHAREBASEDCOMPENSATIONScheduleofRestrictedStockAuthorizedandAvailableforIssuanceDetails"/>
  <link:presentationLink xlink:role="http://www.mainstcapital.com/role/SHAREBASEDCOMPENSATIONScheduleofRestrictedStockAuthorizedandAvailableforIssuanceDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_019e2207-0c30-70ae-92fb-b4629200894f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019e2207-0c30-7f5f-81db-83baff7db18c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_019e2207-0c30-70ae-92fb-b4629200894f" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019e2207-0c30-7f5f-81db-83baff7db18c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_019e2207-0c30-7fb1-b3e3-4c8709af50b1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AwardTypeAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019e2207-0c30-7f5f-81db-83baff7db18c" xlink:to="loc_us-gaap_AwardTypeAxis_019e2207-0c30-7fb1-b3e3-4c8709af50b1" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019e2207-0c30-772d-be8e-c5e5f1723ea7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AwardTypeAxis_019e2207-0c30-7fb1-b3e3-4c8709af50b1" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019e2207-0c30-772d-be8e-c5e5f1723ea7" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockMember_019e2207-0c30-7dd0-a77b-e34b4f2f85a4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestrictedStockMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019e2207-0c30-772d-be8e-c5e5f1723ea7" xlink:to="loc_us-gaap_RestrictedStockMember_019e2207-0c30-7dd0-a77b-e34b4f2f85a4" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameAxis_019e2207-0c30-7503-9050-86a259385c1d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PlanNameAxis"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019e2207-0c30-7f5f-81db-83baff7db18c" xlink:to="loc_us-gaap_PlanNameAxis_019e2207-0c30-7503-9050-86a259385c1d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_019e2207-0c30-7a49-8641-e11630985254" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PlanNameDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PlanNameAxis_019e2207-0c30-7503-9050-86a259385c1d" xlink:to="loc_us-gaap_PlanNameDomain_019e2207-0c30-7a49-8641-e11630985254" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_MainStreetCapitalCorporation2022EquityAndIncentivePlanMember_019e2207-0c30-7495-bed6-7a0f0d6ffe88" xlink:href="main-20260630.xsd#main_MainStreetCapitalCorporation2022EquityAndIncentivePlanMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PlanNameDomain_019e2207-0c30-7a49-8641-e11630985254" xlink:to="loc_main_MainStreetCapitalCorporation2022EquityAndIncentivePlanMember_019e2207-0c30-7495-bed6-7a0f0d6ffe88" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_MainStreetCapitalCorporation2022NonEmployeeDirectorRestrictedStockPlanMember_019e2207-0c30-78b6-91e8-7dd791569f42" xlink:href="main-20260630.xsd#main_MainStreetCapitalCorporation2022NonEmployeeDirectorRestrictedStockPlanMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PlanNameDomain_019e2207-0c30-7a49-8641-e11630985254" xlink:to="loc_main_MainStreetCapitalCorporation2022NonEmployeeDirectorRestrictedStockPlanMember_019e2207-0c30-78b6-91e8-7dd791569f42" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_TitleOfIndividualAxis_019e2207-0c30-7877-b6f9-988953787946" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_TitleOfIndividualAxis"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019e2207-0c30-7f5f-81db-83baff7db18c" xlink:to="loc_srt_TitleOfIndividualAxis_019e2207-0c30-7877-b6f9-988953787946" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_019e2207-0c30-7a4c-a83e-bc5bf6985070" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_TitleOfIndividualWithRelationshipToEntityDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_TitleOfIndividualAxis_019e2207-0c30-7877-b6f9-988953787946" xlink:to="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_019e2207-0c30-7a4c-a83e-bc5bf6985070" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_DirectorMember_019e2207-0c30-700b-bc81-1fc662332aac" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_DirectorMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_019e2207-0c30-7a4c-a83e-bc5bf6985070" xlink:to="loc_srt_DirectorMember_019e2207-0c30-700b-bc81-1fc662332aac" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e2207-0c30-7e12-b331-909a85cf3fab" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019e2207-0c30-7f5f-81db-83baff7db18c" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e2207-0c30-7e12-b331-909a85cf3fab" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_019e2207-0c30-7045-a575-cfc87ba8bcea" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e2207-0c30-7e12-b331-909a85cf3fab" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_019e2207-0c30-7045-a575-cfc87ba8bcea" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_019e2207-0c30-7bc0-a60b-c9b45d195f1b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e2207-0c30-7e12-b331-909a85cf3fab" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_019e2207-0c30-7bc0-a60b-c9b45d195f1b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_019e2207-0c30-7941-876c-55df4e0a818c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e2207-0c30-7e12-b331-909a85cf3fab" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_019e2207-0c30-7941-876c-55df4e0a818c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.mainstcapital.com/role/SHAREBASEDCOMPENSATIONScheduleofRestrictedShareAwardsDetails" xlink:type="simple" xlink:href="main-20260630.xsd#SHAREBASEDCOMPENSATIONScheduleofRestrictedShareAwardsDetails"/>
  <link:presentationLink xlink:role="http://www.mainstcapital.com/role/SHAREBASEDCOMPENSATIONScheduleofRestrictedShareAwardsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_019e2207-0c30-76df-8434-a2fcca152980" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019e2207-0c30-7ae2-a3fc-7957a46ffc14" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_019e2207-0c30-76df-8434-a2fcca152980" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019e2207-0c30-7ae2-a3fc-7957a46ffc14" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_019e2207-0c30-760e-a876-a1aa03227a26" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AwardTypeAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019e2207-0c30-7ae2-a3fc-7957a46ffc14" xlink:to="loc_us-gaap_AwardTypeAxis_019e2207-0c30-760e-a876-a1aa03227a26" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019e2207-0c30-72dc-b372-18b68382c3f2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AwardTypeAxis_019e2207-0c30-760e-a876-a1aa03227a26" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019e2207-0c30-72dc-b372-18b68382c3f2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockMember_019e2207-0c30-7e50-8d3b-4c21efea0487" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestrictedStockMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019e2207-0c30-72dc-b372-18b68382c3f2" xlink:to="loc_us-gaap_RestrictedStockMember_019e2207-0c30-7e50-8d3b-4c21efea0487" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019e2207-0c30-7783-b36c-055b48f01561" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeAxis"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019e2207-0c30-7ae2-a3fc-7957a46ffc14" xlink:to="loc_srt_RangeAxis_019e2207-0c30-7783-b36c-055b48f01561" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019e2207-0c30-7a2b-ad81-141feaee3e0a" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeAxis_019e2207-0c30-7783-b36c-055b48f01561" xlink:to="loc_srt_RangeMember_019e2207-0c30-7a2b-ad81-141feaee3e0a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019e2207-0c30-775f-a177-78722ce36f9b" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MinimumMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeMember_019e2207-0c30-7a2b-ad81-141feaee3e0a" xlink:to="loc_srt_MinimumMember_019e2207-0c30-775f-a177-78722ce36f9b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019e2207-0c30-78ef-8aca-d4aeff71d4e1" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MaximumMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeMember_019e2207-0c30-7a2b-ad81-141feaee3e0a" xlink:to="loc_srt_MaximumMember_019e2207-0c30-78ef-8aca-d4aeff71d4e1" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e2207-0c30-794c-87f4-4776c910b9d4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019e2207-0c30-7ae2-a3fc-7957a46ffc14" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e2207-0c30-794c-87f4-4776c910b9d4" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_019e2207-0c30-7f7e-831d-7d7ada5aa936" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e2207-0c30-794c-87f4-4776c910b9d4" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_019e2207-0c30-7f7e-831d-7d7ada5aa936" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_019e2207-0c30-7cc4-a179-ec246c185e92" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_019e2207-0c30-7f7e-831d-7d7ada5aa936" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_019e2207-0c30-7cc4-a179-ec246c185e92" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/periodStartLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_019e2207-0c30-7c30-ad37-87844dde8b66" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_019e2207-0c30-7f7e-831d-7d7ada5aa936" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_019e2207-0c30-7c30-ad37-87844dde8b66" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_019e2207-0c30-7bb4-a300-26eb37e7ebd0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_019e2207-0c30-7f7e-831d-7d7ada5aa936" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_019e2207-0c30-7bb4-a300-26eb37e7ebd0" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_019e2207-0c30-716f-a3d1-4226704f136e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_019e2207-0c30-7f7e-831d-7d7ada5aa936" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_019e2207-0c30-716f-a3d1-4226704f136e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_019e2207-0c30-79cd-b928-c9ada014da7c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_019e2207-0c30-7f7e-831d-7d7ada5aa936" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_019e2207-0c30-79cd-b928-c9ada014da7c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/periodEndLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_019e2207-0c30-771e-b578-a7572b9418ec" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e2207-0c30-794c-87f4-4776c910b9d4" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_019e2207-0c30-771e-b578-a7572b9418ec" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_019e2207-0c30-792c-bb5d-1279337e08b5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_019e2207-0c30-771e-b578-a7572b9418ec" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_019e2207-0c30-792c-bb5d-1279337e08b5" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/periodStartLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_019e2207-0c30-75f3-8597-24553e71c2fd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_019e2207-0c30-771e-b578-a7572b9418ec" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_019e2207-0c30-75f3-8597-24553e71c2fd" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_019e2207-0c30-737d-a29b-c48554557f79" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_019e2207-0c30-771e-b578-a7572b9418ec" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_019e2207-0c30-737d-a29b-c48554557f79" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_019e2207-0c30-7cf6-bfee-6140c2b34013" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_019e2207-0c30-771e-b578-a7572b9418ec" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_019e2207-0c30-7cf6-bfee-6140c2b34013" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_019e2207-0c30-7a01-9cf6-11bda7f71afb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_019e2207-0c30-771e-b578-a7572b9418ec" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_019e2207-0c30-7a01-9cf6-11bda7f71afb" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/periodEndLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueNonvested_019e2207-0c30-7e61-bf6a-940272f486bf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueNonvested"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e2207-0c30-794c-87f4-4776c910b9d4" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueNonvested_019e2207-0c30-7e61-bf6a-940272f486bf" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_019e2207-0c30-7bad-8c2b-78849208ef17" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e2207-0c30-794c-87f4-4776c910b9d4" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_019e2207-0c30-7bad-8c2b-78849208ef17" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation_019e2207-0c30-72af-88ac-ba43703cd427" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e2207-0c30-794c-87f4-4776c910b9d4" xlink:to="loc_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation_019e2207-0c30-72af-88ac-ba43703cd427" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharePrice_019e2207-0c30-78a7-8d00-0301093b7351" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SharePrice"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e2207-0c30-794c-87f4-4776c910b9d4" xlink:to="loc_us-gaap_SharePrice_019e2207-0c30-78a7-8d00-0301093b7351" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.mainstcapital.com/role/COMMITMENTSANDCONTINGENCIESDetails" xlink:type="simple" xlink:href="main-20260630.xsd#COMMITMENTSANDCONTINGENCIESDetails"/>
  <link:presentationLink xlink:role="http://www.mainstcapital.com/role/COMMITMENTSANDCONTINGENCIESDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommitmentsAndContingenciesDisclosureAbstract_019e2207-0c30-7ba5-b8d5-2b88883a23d4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommitmentsAndContingenciesDisclosureAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsTable_019e2207-0c30-73d4-b6ea-6731deed9d11" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherCommitmentsTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CommitmentsAndContingenciesDisclosureAbstract_019e2207-0c30-7ba5-b8d5-2b88883a23d4" xlink:to="loc_us-gaap_OtherCommitmentsTable_019e2207-0c30-73d4-b6ea-6731deed9d11" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentIdentifierAxis_019e2207-0c30-7609-a6b8-5f5c7d545bcc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentIdentifierAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OtherCommitmentsTable_019e2207-0c30-73d4-b6ea-6731deed9d11" xlink:to="loc_us-gaap_InvestmentIdentifierAxis_019e2207-0c30-7609-a6b8-5f5c7d545bcc" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentIssuerNameAxis_019e2207-0c30-7231-add9-b7b04989a76e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentIssuerNameAxis"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OtherCommitmentsTable_019e2207-0c30-73d4-b6ea-6731deed9d11" xlink:to="loc_us-gaap_InvestmentIssuerNameAxis_019e2207-0c30-7231-add9-b7b04989a76e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0c30-710a-a549-67ee93fefbf6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentIssuerNameDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameAxis_019e2207-0c30-7231-add9-b7b04989a76e" xlink:to="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0c30-710a-a549-67ee93fefbf6" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_BrightwoodCapitalFundInvestmentsMember_019e2207-0c30-7339-bebb-345a9dd3eb44" xlink:href="main-20260630.xsd#main_BrightwoodCapitalFundInvestmentsMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0c30-710a-a549-67ee93fefbf6" xlink:to="loc_main_BrightwoodCapitalFundInvestmentsMember_019e2207-0c30-7339-bebb-345a9dd3eb44" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_HarrisPrestonFundInvestmentsMember_019e2207-0c30-74d6-b3f1-46b5ca1b016c" xlink:href="main-20260630.xsd#main_HarrisPrestonFundInvestmentsMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0c30-710a-a549-67ee93fefbf6" xlink:to="loc_main_HarrisPrestonFundInvestmentsMember_019e2207-0c30-74d6-b3f1-46b5ca1b016c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_UnionRockEnergyFundInvestmentsMember_019e2207-0c30-7aa3-9917-284bde457a65" xlink:href="main-20260630.xsd#main_UnionRockEnergyFundInvestmentsMember"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerNameDomain_019e2207-0c30-710a-a549-67ee93fefbf6" xlink:to="loc_main_UnionRockEnergyFundInvestmentsMember_019e2207-0c30-7aa3-9917-284bde457a65" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeAxis_019e2207-0c30-750c-8475-1a160deefa0e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentTypeAxis"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OtherCommitmentsTable_019e2207-0c30-73d4-b6ea-6731deed9d11" xlink:to="loc_us-gaap_InvestmentTypeAxis_019e2207-0c30-750c-8475-1a160deefa0e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_019e2207-0c30-712d-932d-edfc322be895" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentTypeAxis_019e2207-0c30-750c-8475-1a160deefa0e" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_019e2207-0c30-712d-932d-edfc322be895" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesMember_019e2207-0c30-7d3e-9fb9-88abe135fe97" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquitySecuritiesMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019e2207-0c30-712d-932d-edfc322be895" xlink:to="loc_us-gaap_EquitySecuritiesMember_019e2207-0c30-7d3e-9fb9-88abe135fe97" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesMember_019e2207-0c30-7199-8e35-4a0f4c0ab792" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019e2207-0c30-712d-932d-edfc322be895" xlink:to="loc_us-gaap_DebtSecuritiesMember_019e2207-0c30-7199-8e35-4a0f4c0ab792" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAggregatedInvestmentsMember_019e2207-0c30-75e3-9b37-725021e0f180" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherAggregatedInvestmentsMember"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019e2207-0c30-712d-932d-edfc322be895" xlink:to="loc_us-gaap_OtherAggregatedInvestmentsMember_019e2207-0c30-75e3-9b37-725021e0f180" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsLineItems_019e2207-0c30-7ea1-9fd1-cbe1e755c720" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherCommitmentsLineItems"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OtherCommitmentsTable_019e2207-0c30-73d4-b6ea-6731deed9d11" xlink:to="loc_us-gaap_OtherCommitmentsLineItems_019e2207-0c30-7ea1-9fd1-cbe1e755c720" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentCompanyFinancialCommitmentToInvesteeFutureAmount_019e2207-0c30-76e7-badf-da2e7f6ce2fe" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentCompanyFinancialCommitmentToInvesteeFutureAmount"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_019e2207-0c30-7ea1-9fd1-cbe1e755c720" xlink:to="loc_us-gaap_InvestmentCompanyFinancialCommitmentToInvesteeFutureAmount_019e2207-0c30-76e7-badf-da2e7f6ce2fe" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_InvestmentCompanyNumberOfAdditionalInvestmentsInvestmentPeriodExpiredWithRemainingCommitmentsRestrictedForFundExpenses_019e2207-0c30-7780-8b02-2ae7dfb22f92" xlink:href="main-20260630.xsd#main_InvestmentCompanyNumberOfAdditionalInvestmentsInvestmentPeriodExpiredWithRemainingCommitmentsRestrictedForFundExpenses"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_019e2207-0c30-7ea1-9fd1-cbe1e755c720" xlink:to="loc_main_InvestmentCompanyNumberOfAdditionalInvestmentsInvestmentPeriodExpiredWithRemainingCommitmentsRestrictedForFundExpenses_019e2207-0c30-7780-8b02-2ae7dfb22f92" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_InvestmentCompanyNumberOfAdditionalInvestmentsCommitmentsRestrictedForFundExpensesOrFollowOnInvestmentsInExistingPortfolio_019e2207-0c30-7c9d-b52b-0400c4757605" xlink:href="main-20260630.xsd#main_InvestmentCompanyNumberOfAdditionalInvestmentsCommitmentsRestrictedForFundExpensesOrFollowOnInvestmentsInExistingPortfolio"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_019e2207-0c30-7ea1-9fd1-cbe1e755c720" xlink:to="loc_main_InvestmentCompanyNumberOfAdditionalInvestmentsCommitmentsRestrictedForFundExpensesOrFollowOnInvestmentsInExistingPortfolio_019e2207-0c30-7c9d-b52b-0400c4757605" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.mainstcapital.com/role/RELATEDPARTYTRANSACTIONSDetails" xlink:type="simple" xlink:href="main-20260630.xsd#RELATEDPARTYTRANSACTIONSDetails"/>
  <link:presentationLink xlink:role="http://www.mainstcapital.com/role/RELATEDPARTYTRANSACTIONSDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsAbstract_019e2207-0c30-7870-ba38-ec1bbcf24b6c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyTransactionsAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019e2207-0c30-730d-97f7-cd6201a327ad" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RelatedPartyTransactionsAbstract_019e2207-0c30-7870-ba38-ec1bbcf24b6c" xlink:to="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019e2207-0c30-730d-97f7-cd6201a327ad" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CounterpartyNameAxis_019e2207-0c30-7b87-a212-5b3b0ae19e0d" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_CounterpartyNameAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019e2207-0c30-730d-97f7-cd6201a327ad" xlink:to="loc_srt_CounterpartyNameAxis_019e2207-0c30-7b87-a212-5b3b0ae19e0d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019e2207-0c30-785e-9461-61ffa8c80bc1" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_CounterpartyNameAxis_019e2207-0c30-7b87-a212-5b3b0ae19e0d" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019e2207-0c30-785e-9461-61ffa8c80bc1" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_ExternalInvestmentManagerMember_019e681b-c3ea-7de5-9baf-b46e2a350726" xlink:href="main-20260630.xsd#main_ExternalInvestmentManagerMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019e2207-0c30-785e-9461-61ffa8c80bc1" xlink:to="loc_main_ExternalInvestmentManagerMember_019e681b-c3ea-7de5-9baf-b46e2a350726" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_MSCIncomeMember_019e681b-e93c-7361-a05f-d9d2673daa0d" xlink:href="main-20260630.xsd#main_MSCIncomeMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019e2207-0c30-785e-9461-61ffa8c80bc1" xlink:to="loc_main_MSCIncomeMember_019e681b-e93c-7361-a05f-d9d2673daa0d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_PrivateLoanFundIMember_019e681c-3bf6-7dce-98d8-f9bcc52a7fbc" xlink:href="main-20260630.xsd#main_PrivateLoanFundIMember"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019e2207-0c30-785e-9461-61ffa8c80bc1" xlink:to="loc_main_PrivateLoanFundIMember_019e681c-3bf6-7dce-98d8-f9bcc52a7fbc" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_PrivateLoanFundIIMember_019e681c-9350-704d-b2a3-415d816414ed" xlink:href="main-20260630.xsd#main_PrivateLoanFundIIMember"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019e2207-0c30-785e-9461-61ffa8c80bc1" xlink:to="loc_main_PrivateLoanFundIIMember_019e681c-9350-704d-b2a3-415d816414ed" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019e681b-c3ea-7ff5-89d6-49ad54f4d566" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019e2207-0c30-730d-97f7-cd6201a327ad" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019e681b-c3ea-7ff5-89d6-49ad54f4d566" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019e681b-c3ea-7c12-9368-080ca62f83db" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019e681b-c3ea-7ff5-89d6-49ad54f4d566" xlink:to="loc_us-gaap_RelatedPartyDomain_019e681b-c3ea-7c12-9368-080ca62f83db" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyMember_019e681b-c3ea-75a7-affa-5710c6b55311" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RelatedPartyDomain_019e681b-c3ea-7c12-9368-080ca62f83db" xlink:to="loc_us-gaap_RelatedPartyMember_019e681b-c3ea-75a7-affa-5710c6b55311" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionAxis_019e681b-c3ea-7d07-b8e3-17109e145fa9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyTransactionAxis"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019e2207-0c30-730d-97f7-cd6201a327ad" xlink:to="loc_us-gaap_RelatedPartyTransactionAxis_019e681b-c3ea-7d07-b8e3-17109e145fa9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionDomain_019e681b-c3ea-77ed-b491-9b27eb64919a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyTransactionDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RelatedPartyTransactionAxis_019e681b-c3ea-7d07-b8e3-17109e145fa9" xlink:to="loc_us-gaap_RelatedPartyTransactionDomain_019e681b-c3ea-77ed-b491-9b27eb64919a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_OperatingExpensesAndAmountDueFromTaxSharingAgreementMember_019e681b-c3ea-7507-bb4a-cd4157acc1df" xlink:href="main-20260630.xsd#main_OperatingExpensesAndAmountDueFromTaxSharingAgreementMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RelatedPartyTransactionDomain_019e681b-c3ea-77ed-b491-9b27eb64919a" xlink:to="loc_main_OperatingExpensesAndAmountDueFromTaxSharingAgreementMember_019e681b-c3ea-7507-bb4a-cd4157acc1df" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_DividendsDeclaredButNotYetPaidMember_019e681b-c3ea-73f3-8384-6515eebfb82e" xlink:href="main-20260630.xsd#main_DividendsDeclaredButNotYetPaidMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RelatedPartyTransactionDomain_019e681b-c3ea-77ed-b491-9b27eb64919a" xlink:to="loc_main_DividendsDeclaredButNotYetPaidMember_019e681b-c3ea-73f3-8384-6515eebfb82e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_UnsecuredRevolvingPromissoryNoteMember_019e681c-17bd-7fc1-b110-d6cfeb4b0470" xlink:href="main-20260630.xsd#main_UnsecuredRevolvingPromissoryNoteMember"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RelatedPartyTransactionDomain_019e681b-c3ea-77ed-b491-9b27eb64919a" xlink:to="loc_main_UnsecuredRevolvingPromissoryNoteMember_019e681c-17bd-7fc1-b110-d6cfeb4b0470" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_SecuredRevolvingPromissoryNoteMember_019e681c-17bd-75e4-8d47-998c3edaaf42" xlink:href="main-20260630.xsd#main_SecuredRevolvingPromissoryNoteMember"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RelatedPartyTransactionDomain_019e681b-c3ea-77ed-b491-9b27eb64919a" xlink:to="loc_main_SecuredRevolvingPromissoryNoteMember_019e681c-17bd-75e4-8d47-998c3edaaf42" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_InvestmentManagementAgreementMember_019e681c-3bf6-7d50-b7c5-5a09d51aff46" xlink:href="main-20260630.xsd#main_InvestmentManagementAgreementMember"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RelatedPartyTransactionDomain_019e681b-c3ea-77ed-b491-9b27eb64919a" xlink:to="loc_main_InvestmentManagementAgreementMember_019e681c-3bf6-7d50-b7c5-5a09d51aff46" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_The2015DeferredCompensationPlanMember_019e681c-dae8-7d78-a518-21e50a0ce035" xlink:href="main-20260630.xsd#main_The2015DeferredCompensationPlanMember"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RelatedPartyTransactionDomain_019e681b-c3ea-77ed-b491-9b27eb64919a" xlink:to="loc_main_The2015DeferredCompensationPlanMember_019e681c-dae8-7d78-a518-21e50a0ce035" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_019e681c-dae8-72b8-96a2-06ae85837907" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AwardTypeAxis"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019e2207-0c30-730d-97f7-cd6201a327ad" xlink:to="loc_us-gaap_AwardTypeAxis_019e681c-dae8-72b8-96a2-06ae85837907" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019e681c-dae8-7f83-be38-1286be35e819" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AwardTypeAxis_019e681c-dae8-72b8-96a2-06ae85837907" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019e681c-dae8-7f83-be38-1286be35e819" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PhantomShareUnitsPSUsMember_019e681c-dae8-7fe0-8183-0f118464df77" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PhantomShareUnitsPSUsMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019e681c-dae8-7f83-be38-1286be35e819" xlink:to="loc_us-gaap_PhantomShareUnitsPSUsMember_019e681c-dae8-7fe0-8183-0f118464df77" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_019e681c-dae8-7967-99ec-d6f33a9d3710" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019e2207-0c30-730d-97f7-cd6201a327ad" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_019e681c-dae8-7967-99ec-d6f33a9d3710" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019e681c-dae8-7d8d-9483-e33634018bda" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityComponentDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019e681c-dae8-7967-99ec-d6f33a9d3710" xlink:to="loc_us-gaap_EquityComponentDomain_019e681c-dae8-7d8d-9483-e33634018bda" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_019e681c-dae8-795e-9abc-76be437a52f8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityComponentDomain_019e681c-dae8-7d8d-9483-e33634018bda" xlink:to="loc_us-gaap_CommonStockMember_019e681c-dae8-795e-9abc-76be437a52f8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019e681c-dae8-7f67-b4cf-d2b94a188f38" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019e2207-0c30-730d-97f7-cd6201a327ad" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019e681c-dae8-7f67-b4cf-d2b94a188f38" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e681c-dae8-7e65-8e41-8d7fd6ddffda" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019e681c-dae8-7f67-b4cf-d2b94a188f38" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e681c-dae8-7e65-8e41-8d7fd6ddffda" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_RabbiTrustMember_019e681c-dae8-72cc-a059-6a438e198555" xlink:href="main-20260630.xsd#main_RabbiTrustMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e681c-dae8-7e65-8e41-8d7fd6ddffda" xlink:to="loc_main_RabbiTrustMember_019e681c-dae8-72cc-a059-6a438e198555" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionLineItems_019e2207-0c30-7976-820c-fc0c6e1b95e4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyTransactionLineItems"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019e2207-0c30-730d-97f7-cd6201a327ad" xlink:to="loc_us-gaap_RelatedPartyTransactionLineItems_019e2207-0c30-7976-820c-fc0c6e1b95e4" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherReceivables_019e681b-c3ea-7641-bb52-49a770b85984" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherReceivables"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019e2207-0c30-7976-820c-fc0c6e1b95e4" xlink:to="loc_us-gaap_OtherReceivables_019e681b-c3ea-7641-bb52-49a770b85984" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_SharePurchaseProgramPercentageOfOutstandingStockMaximum_019eb6b1-a6c2-716c-bf5d-e34a725c1db4" xlink:href="main-20260630.xsd#main_SharePurchaseProgramPercentageOfOutstandingStockMaximum"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019e2207-0c30-7976-820c-fc0c6e1b95e4" xlink:to="loc_main_SharePurchaseProgramPercentageOfOutstandingStockMaximum_019eb6b1-a6c2-716c-bf5d-e34a725c1db4" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentOwnedBalanceShares_019e681b-e93c-71a7-b1c8-282a5c12598e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentOwnedBalanceShares"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019e2207-0c30-7976-820c-fc0c6e1b95e4" xlink:to="loc_us-gaap_InvestmentOwnedBalanceShares_019e681b-e93c-71a7-b1c8-282a5c12598e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionAmountsOfTransaction_019e681c-17bd-70cc-87b0-a33f8a5b055f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyTransactionAmountsOfTransaction"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019e2207-0c30-7976-820c-fc0c6e1b95e4" xlink:to="loc_us-gaap_RelatedPartyTransactionAmountsOfTransaction_019e681c-17bd-70cc-87b0-a33f8a5b055f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionRate_019e681c-17bd-7cc5-a208-be92ee071117" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyTransactionRate"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019e2207-0c30-7976-820c-fc0c6e1b95e4" xlink:to="loc_us-gaap_RelatedPartyTransactionRate_019e681c-17bd-7cc5-a208-be92ee071117" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_RelatedPartyTransactionFloorRate_019e681c-17bd-7fa9-af80-8d8d11d9baac" xlink:href="main-20260630.xsd#main_RelatedPartyTransactionFloorRate"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019e2207-0c30-7976-820c-fc0c6e1b95e4" xlink:to="loc_main_RelatedPartyTransactionFloorRate_019e681c-17bd-7fa9-af80-8d8d11d9baac" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_RelatedPartyTransactionUnusedCapacityCommitmentFeePercentage_019e681c-17bd-7b17-9886-3f2fd3e9a8a6" xlink:href="main-20260630.xsd#main_RelatedPartyTransactionUnusedCapacityCommitmentFeePercentage"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019e2207-0c30-7976-820c-fc0c6e1b95e4" xlink:to="loc_main_RelatedPartyTransactionUnusedCapacityCommitmentFeePercentage_019e681c-17bd-7b17-9886-3f2fd3e9a8a6" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_RelatedPartyTransactionAmountOfDebtOutstanding_019e681c-17bd-7e0f-957c-648a91507a69" xlink:href="main-20260630.xsd#main_RelatedPartyTransactionAmountOfDebtOutstanding"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019e2207-0c30-7976-820c-fc0c6e1b95e4" xlink:to="loc_main_RelatedPartyTransactionAmountOfDebtOutstanding_019e681c-17bd-7e0f-957c-648a91507a69" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionPurchasesFromRelatedParty_019e681c-3bf6-78c7-bf14-db2d7fc3c927" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyTransactionPurchasesFromRelatedParty"/>
    <link:presentationArc order="9" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019e2207-0c30-7976-820c-fc0c6e1b95e4" xlink:to="loc_us-gaap_RelatedPartyTransactionPurchasesFromRelatedParty_019e681c-3bf6-78c7-bf14-db2d7fc3c927" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_RelatedPartyTransactionPercentageOfTotalCommitments_019e681c-9350-73e8-9638-fd3152c0fcbf" xlink:href="main-20260630.xsd#main_RelatedPartyTransactionPercentageOfTotalCommitments"/>
    <link:presentationArc order="10" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019e2207-0c30-7976-820c-fc0c6e1b95e4" xlink:to="loc_main_RelatedPartyTransactionPercentageOfTotalCommitments_019e681c-9350-73e8-9638-fd3152c0fcbf" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableOtherCurrentAndNoncurrent_019e681c-9350-77fe-9979-50df43ad1082" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccountsPayableOtherCurrentAndNoncurrent"/>
    <link:presentationArc order="11" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019e2207-0c30-7976-820c-fc0c6e1b95e4" xlink:to="loc_us-gaap_AccountsPayableOtherCurrentAndNoncurrent_019e681c-9350-77fe-9979-50df43ad1082" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_RelatedPartyTransactionTransactionAmountShares_019e681c-dae8-7612-839c-2ff67c7ee151" xlink:href="main-20260630.xsd#main_RelatedPartyTransactionTransactionAmountShares"/>
    <link:presentationArc order="12" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019e2207-0c30-7976-820c-fc0c6e1b95e4" xlink:to="loc_main_RelatedPartyTransactionTransactionAmountShares_019e681c-dae8-7612-839c-2ff67c7ee151" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.mainstcapital.com/role/SUBSEQUENTEVENTSDetails" xlink:type="simple" xlink:href="main-20260630.xsd#SUBSEQUENTEVENTSDetails"/>
  <link:presentationLink xlink:role="http://www.mainstcapital.com/role/SUBSEQUENTEVENTSDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventsAbstract_019e2207-0c30-77c9-b2da-c8d5437d325e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventsAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTable_019e2207-0c30-7309-aef0-fbfa7e0df0ae" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SubsequentEventsAbstract_019e2207-0c30-77c9-b2da-c8d5437d325e" xlink:to="loc_us-gaap_SubsequentEventTable_019e2207-0c30-7309-aef0-fbfa7e0df0ae" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsAxis_019e2207-0c30-798f-89f7-d4fc1b6a39f1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DividendsAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SubsequentEventTable_019e2207-0c30-7309-aef0-fbfa7e0df0ae" xlink:to="loc_us-gaap_DividendsAxis_019e2207-0c30-798f-89f7-d4fc1b6a39f1" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsDomain_019e2207-0c30-7284-ae55-016f2fb5a22a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DividendsDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DividendsAxis_019e2207-0c30-798f-89f7-d4fc1b6a39f1" xlink:to="loc_us-gaap_DividendsDomain_019e2207-0c30-7284-ae55-016f2fb5a22a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_O2026Q3SupplementalDividendsMember_019e6954-0573-721e-96c9-93c8ab60580c" xlink:href="main-20260630.xsd#main_O2026Q3SupplementalDividendsMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DividendsDomain_019e2207-0c30-7284-ae55-016f2fb5a22a" xlink:to="loc_main_O2026Q3SupplementalDividendsMember_019e6954-0573-721e-96c9-93c8ab60580c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_O2026M4DividendsMember_019e6954-0573-7d5c-a279-3ca4636506cc" xlink:href="main-20260630.xsd#main_O2026M4DividendsMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DividendsDomain_019e2207-0c30-7284-ae55-016f2fb5a22a" xlink:to="loc_main_O2026M4DividendsMember_019e6954-0573-7d5c-a279-3ca4636506cc" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_O2026M5DividendsMember_019e6954-0573-7521-9ca7-567dba3822e7" xlink:href="main-20260630.xsd#main_O2026M5DividendsMember"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DividendsDomain_019e2207-0c30-7284-ae55-016f2fb5a22a" xlink:to="loc_main_O2026M5DividendsMember_019e6954-0573-7521-9ca7-567dba3822e7" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_O2026M6DividendsMember_019e6954-0573-7b2c-a712-ba444c08d27e" xlink:href="main-20260630.xsd#main_O2026M6DividendsMember"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DividendsDomain_019e2207-0c30-7284-ae55-016f2fb5a22a" xlink:to="loc_main_O2026M6DividendsMember_019e6954-0573-7b2c-a712-ba444c08d27e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_O2026Q3DividendsMember_019e6954-0573-7da4-851e-3ed40bd8204e" xlink:href="main-20260630.xsd#main_O2026Q3DividendsMember"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DividendsDomain_019e2207-0c30-7284-ae55-016f2fb5a22a" xlink:to="loc_main_O2026Q3DividendsMember_019e6954-0573-7da4-851e-3ed40bd8204e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_O2026Q3IncludingSupplementalDividendsMember_019e6954-0573-7785-9a39-a8cd3d5186b4" xlink:href="main-20260630.xsd#main_O2026Q3IncludingSupplementalDividendsMember"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DividendsDomain_019e2207-0c30-7284-ae55-016f2fb5a22a" xlink:to="loc_main_O2026Q3IncludingSupplementalDividendsMember_019e6954-0573-7785-9a39-a8cd3d5186b4" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_O2026M7DividendsMember_019e6954-0573-74ea-a926-0fae76b9f99b" xlink:href="main-20260630.xsd#main_O2026M7DividendsMember"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DividendsDomain_019e2207-0c30-7284-ae55-016f2fb5a22a" xlink:to="loc_main_O2026M7DividendsMember_019e6954-0573-74ea-a926-0fae76b9f99b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_O2026M8DividendsMember_019e6954-0573-7c64-9e43-f491d72df047" xlink:href="main-20260630.xsd#main_O2026M8DividendsMember"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DividendsDomain_019e2207-0c30-7284-ae55-016f2fb5a22a" xlink:to="loc_main_O2026M8DividendsMember_019e6954-0573-7c64-9e43-f491d72df047" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_O2026M9DividendsMember_019e6954-0573-71b0-a307-43b2663d9a85" xlink:href="main-20260630.xsd#main_O2026M9DividendsMember"/>
    <link:presentationArc order="9" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DividendsDomain_019e2207-0c30-7284-ae55-016f2fb5a22a" xlink:to="loc_main_O2026M9DividendsMember_019e6954-0573-71b0-a307-43b2663d9a85" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_O2026Q4DividendsMember_019e6954-0573-74c9-b5f2-d4134cff7df8" xlink:href="main-20260630.xsd#main_O2026Q4DividendsMember"/>
    <link:presentationArc order="10" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DividendsDomain_019e2207-0c30-7284-ae55-016f2fb5a22a" xlink:to="loc_main_O2026Q4DividendsMember_019e6954-0573-74c9-b5f2-d4134cff7df8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_O2026A4LifeToDateDividendsMember_019e6956-0eab-7b21-9af4-ec9542d37a3c" xlink:href="main-20260630.xsd#main_O2026A4LifeToDateDividendsMember"/>
    <link:presentationArc order="11" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DividendsDomain_019e2207-0c30-7284-ae55-016f2fb5a22a" xlink:to="loc_main_O2026A4LifeToDateDividendsMember_019e6956-0eab-7b21-9af4-ec9542d37a3c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_019e6954-0573-7ac6-a293-be2a63cc8771" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventTypeAxis"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SubsequentEventTable_019e2207-0c30-7309-aef0-fbfa7e0df0ae" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_019e6954-0573-7ac6-a293-be2a63cc8771" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_019e6954-0573-78bc-a02c-83f4fe6db57a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_019e6954-0573-7ac6-a293-be2a63cc8771" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_019e6954-0573-78bc-a02c-83f4fe6db57a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_019e6954-0573-751b-bcaa-9f2c84879871" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_019e6954-0573-78bc-a02c-83f4fe6db57a" xlink:to="loc_us-gaap_SubsequentEventMember_019e6954-0573-751b-bcaa-9f2c84879871" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementScenarioAxis_019e6954-0573-7aff-84d7-1f3e3dd92518" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_StatementScenarioAxis"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SubsequentEventTable_019e2207-0c30-7309-aef0-fbfa7e0df0ae" xlink:to="loc_srt_StatementScenarioAxis_019e6954-0573-7aff-84d7-1f3e3dd92518" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain_019e6954-0573-725f-99d1-c85b4b4c0ed3" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ScenarioUnspecifiedDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_StatementScenarioAxis_019e6954-0573-7aff-84d7-1f3e3dd92518" xlink:to="loc_srt_ScenarioUnspecifiedDomain_019e6954-0573-725f-99d1-c85b4b4c0ed3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioForecastMember_019e6954-0573-795f-839c-15632c4a7f59" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ScenarioForecastMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_ScenarioUnspecifiedDomain_019e6954-0573-725f-99d1-c85b4b4c0ed3" xlink:to="loc_srt_ScenarioForecastMember_019e6954-0573-795f-839c-15632c4a7f59" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CounterpartyNameAxis_019fb3a7-5851-7f42-972d-a86142ba15ee" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_CounterpartyNameAxis"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SubsequentEventTable_019e2207-0c30-7309-aef0-fbfa7e0df0ae" xlink:to="loc_srt_CounterpartyNameAxis_019fb3a7-5851-7f42-972d-a86142ba15ee" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019fb3a7-5851-75cf-8e24-9611cbecce09" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_CounterpartyNameAxis_019fb3a7-5851-7f42-972d-a86142ba15ee" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019fb3a7-5851-75cf-8e24-9611cbecce09" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_MSCIncomeMember_019fb3af-4bc2-7d8f-ae4e-f22c94636e14" xlink:href="main-20260630.xsd#main_MSCIncomeMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019fb3a7-5851-75cf-8e24-9611cbecce09" xlink:to="loc_main_MSCIncomeMember_019fb3af-4bc2-7d8f-ae4e-f22c94636e14" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventLineItems_019e2207-0c30-7223-b955-0359c89c64b4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventLineItems"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SubsequentEventTable_019e2207-0c30-7309-aef0-fbfa7e0df0ae" xlink:to="loc_us-gaap_SubsequentEventLineItems_019e2207-0c30-7223-b955-0359c89c64b4" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockDividendsPerShareDeclared_019e6954-0573-75df-ab6c-8adaa04e2611" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockDividendsPerShareDeclared"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SubsequentEventLineItems_019e2207-0c30-7223-b955-0359c89c64b4" xlink:to="loc_us-gaap_CommonStockDividendsPerShareDeclared_019e6954-0573-75df-ab6c-8adaa04e2611" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_IncreaseDecreaseInCommonStockDividendsDeclaredMonthly_019e6954-0573-7f07-bbc3-99954570de75" xlink:href="main-20260630.xsd#main_IncreaseDecreaseInCommonStockDividendsDeclaredMonthly"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SubsequentEventLineItems_019e2207-0c30-7223-b955-0359c89c64b4" xlink:to="loc_main_IncreaseDecreaseInCommonStockDividendsDeclaredMonthly_019e6954-0573-7f07-bbc3-99954570de75" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockDividendsPerShareCashPaid_019e6954-0574-79c3-9ccb-8d0c0e04dc5f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockDividendsPerShareCashPaid"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SubsequentEventLineItems_019e2207-0c30-7223-b955-0359c89c64b4" xlink:to="loc_us-gaap_CommonStockDividendsPerShareCashPaid_019e6954-0574-79c3-9ccb-8d0c0e04dc5f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_SharePurchaseProgramAuthorizedAmount_019fb3a5-db27-7a6b-9af8-7cb7022a6913" xlink:href="main-20260630.xsd#main_SharePurchaseProgramAuthorizedAmount"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SubsequentEventLineItems_019e2207-0c30-7223-b955-0359c89c64b4" xlink:to="loc_main_SharePurchaseProgramAuthorizedAmount_019fb3a5-db27-7a6b-9af8-7cb7022a6913" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StockRepurchaseProgramAuthorizedAmount1_019fb3b2-67cf-7597-bf17-dc2c19dd4f53" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_StockRepurchaseProgramAuthorizedAmount1"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SubsequentEventLineItems_019e2207-0c30-7223-b955-0359c89c64b4" xlink:to="loc_srt_StockRepurchaseProgramAuthorizedAmount1_019fb3b2-67cf-7597-bf17-dc2c19dd4f53" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_SharePurchaseRepurchaseProgramNumberOfActivePlans_019fb3b5-a725-70d9-832c-e8939d00e6f1" xlink:href="main-20260630.xsd#main_SharePurchaseRepurchaseProgramNumberOfActivePlans"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SubsequentEventLineItems_019e2207-0c30-7223-b955-0359c89c64b4" xlink:to="loc_main_SharePurchaseRepurchaseProgramNumberOfActivePlans_019fb3b5-a725-70d9-832c-e8939d00e6f1" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.mainstcapital.com/role/ConsolidatedScheduleofInvestmentsinandAdvancestoAffiliatesDetails" xlink:type="simple" xlink:href="main-20260630.xsd#ConsolidatedScheduleofInvestmentsinandAdvancestoAffiliatesDetails"/>
  <link:presentationLink xlink:role="http://www.mainstcapital.com/role/ConsolidatedScheduleofInvestmentsinandAdvancestoAffiliatesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentsInAndAdvancesToAffiliatesScheduleOfInvestmentsAbstract_019e2207-0c30-72fa-8e96-7ea6140a2a01" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentsInAndAdvancesToAffiliatesScheduleOfInvestmentsAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentsInAndAdvancesToAffiliatesTable_019e2207-0c30-7f4e-99a9-d008dc6e7bb1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentsInAndAdvancesToAffiliatesTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentsInAndAdvancesToAffiliatesScheduleOfInvestmentsAbstract_019e2207-0c30-72fa-8e96-7ea6140a2a01" xlink:to="loc_us-gaap_InvestmentsInAndAdvancesToAffiliatesTable_019e2207-0c30-7f4e-99a9-d008dc6e7bb1" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentIdentifierAxis_019e2207-0c30-7e90-8599-149fd6181cc4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentIdentifierAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentsInAndAdvancesToAffiliatesTable_019e2207-0c30-7f4e-99a9-d008dc6e7bb1" xlink:to="loc_us-gaap_InvestmentIdentifierAxis_019e2207-0c30-7e90-8599-149fd6181cc4" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentIssuerAffiliationAxis_019e2207-0c30-74a8-9d9a-8dcfeae640d3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentIssuerAffiliationAxis"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentsInAndAdvancesToAffiliatesTable_019e2207-0c30-7f4e-99a9-d008dc6e7bb1" xlink:to="loc_us-gaap_InvestmentIssuerAffiliationAxis_019e2207-0c30-74a8-9d9a-8dcfeae640d3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentIssuerAffiliationDomain_019e2207-0c30-7147-896a-dea09ea12451" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentIssuerAffiliationDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerAffiliationAxis_019e2207-0c30-74a8-9d9a-8dcfeae640d3" xlink:to="loc_us-gaap_InvestmentIssuerAffiliationDomain_019e2207-0c30-7147-896a-dea09ea12451" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentAffiliatedIssuerControlledMember_019e2207-0c30-7c4a-b5cd-a291d04760cd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentAffiliatedIssuerControlledMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerAffiliationDomain_019e2207-0c30-7147-896a-dea09ea12451" xlink:to="loc_us-gaap_InvestmentAffiliatedIssuerControlledMember_019e2207-0c30-7c4a-b5cd-a291d04760cd" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentAffiliatedIssuerNoncontrolledMember_019e2207-0c30-7c36-8d08-f79dac942309" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentAffiliatedIssuerNoncontrolledMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerAffiliationDomain_019e2207-0c30-7147-896a-dea09ea12451" xlink:to="loc_us-gaap_InvestmentAffiliatedIssuerNoncontrolledMember_019e2207-0c30-7c36-8d08-f79dac942309" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfInvestmentsLineItems_019e2207-0c30-75ed-a196-d16b3afd4284" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfInvestmentsLineItems"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentsInAndAdvancesToAffiliatesTable_019e2207-0c30-7f4e-99a9-d008dc6e7bb1" xlink:to="loc_us-gaap_ScheduleOfInvestmentsLineItems_019e2207-0c30-75ed-a196-d16b3afd4284" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentInterestRate_019e2207-0c30-7344-9522-e4ee84d12469" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentInterestRate"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019e2207-0c30-75ed-a196-d16b3afd4284" xlink:to="loc_us-gaap_InvestmentInterestRate_019e2207-0c30-7344-9522-e4ee84d12469" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentBasisSpreadVariableRate_019e2207-0c30-7e0b-8734-8b7ec9efbe80" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentBasisSpreadVariableRate"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019e2207-0c30-75ed-a196-d16b3afd4284" xlink:to="loc_us-gaap_InvestmentBasisSpreadVariableRate_019e2207-0c30-7e0b-8734-8b7ec9efbe80" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentInterestRatePaidInKind_019e2207-0c30-70de-a484-eaebc70a5ab8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentInterestRatePaidInKind"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019e2207-0c30-75ed-a196-d16b3afd4284" xlink:to="loc_us-gaap_InvestmentInterestRatePaidInKind_019e2207-0c30-70de-a484-eaebc70a5ab8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtAndEquitySecuritiesRealizedGainLoss_019e2207-0c30-7535-81b7-33e237a4d8c9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtAndEquitySecuritiesRealizedGainLoss"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019e2207-0c30-75ed-a196-d16b3afd4284" xlink:to="loc_us-gaap_DebtAndEquitySecuritiesRealizedGainLoss_019e2207-0c30-7535-81b7-33e237a4d8c9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtAndEquitySecuritiesUnrealizedGainLoss_019e2207-0c30-796c-a254-4639ad15eac6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtAndEquitySecuritiesUnrealizedGainLoss"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019e2207-0c30-75ed-a196-d16b3afd4284" xlink:to="loc_us-gaap_DebtAndEquitySecuritiesUnrealizedGainLoss_019e2207-0c30-796c-a254-4639ad15eac6" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_InterestFeesAndDividendIncomeSecuritiesOperating_019e2207-0c30-7404-b9b9-522ebd74621e" xlink:href="main-20260630.xsd#main_InterestFeesAndDividendIncomeSecuritiesOperating"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019e2207-0c30-75ed-a196-d16b3afd4284" xlink:to="loc_main_InterestFeesAndDividendIncomeSecuritiesOperating_019e2207-0c30-7404-b9b9-522ebd74621e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentsInAndAdvancesToAffiliatesAtFairValueRollForward_019e2207-0c30-7404-b140-c873c68ccd54" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentsInAndAdvancesToAffiliatesAtFairValueRollForward"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019e2207-0c30-75ed-a196-d16b3afd4284" xlink:to="loc_us-gaap_InvestmentsInAndAdvancesToAffiliatesAtFairValueRollForward_019e2207-0c30-7404-b140-c873c68ccd54" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentOwnedAtFairValue_019e2207-0c30-7516-a2ef-1d8829826fc5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentOwnedAtFairValue"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentsInAndAdvancesToAffiliatesAtFairValueRollForward_019e2207-0c30-7404-b140-c873c68ccd54" xlink:to="loc_us-gaap_InvestmentOwnedAtFairValue_019e2207-0c30-7516-a2ef-1d8829826fc5" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/periodStartLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentsInAndAdvancesToAffiliatesAtFairValueGrossAdditions_019e2207-0c30-756c-8b40-1109735a5c2d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentsInAndAdvancesToAffiliatesAtFairValueGrossAdditions"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentsInAndAdvancesToAffiliatesAtFairValueRollForward_019e2207-0c30-7404-b140-c873c68ccd54" xlink:to="loc_us-gaap_InvestmentsInAndAdvancesToAffiliatesAtFairValueGrossAdditions_019e2207-0c30-756c-8b40-1109735a5c2d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentsInAndAdvancesToAffiliatesAtFairValueGrossReductions_019e2207-0c30-799f-a892-c793191a0460" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentsInAndAdvancesToAffiliatesAtFairValueGrossReductions"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentsInAndAdvancesToAffiliatesAtFairValueRollForward_019e2207-0c30-7404-b140-c873c68ccd54" xlink:to="loc_us-gaap_InvestmentsInAndAdvancesToAffiliatesAtFairValueGrossReductions_019e2207-0c30-799f-a892-c793191a0460" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentOwnedAtFairValue_019e2207-0c30-78b3-92f7-4517c54e6eb7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentOwnedAtFairValue"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentsInAndAdvancesToAffiliatesAtFairValueRollForward_019e2207-0c30-7404-b140-c873c68ccd54" xlink:to="loc_us-gaap_InvestmentOwnedAtFairValue_019e2207-0c30-78b3-92f7-4517c54e6eb7" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/periodEndLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.mainstcapital.com/role/ConsolidatedScheduleofInvestmentsinandAdvancestoAffiliatesFootnotesDetails" xlink:type="simple" xlink:href="main-20260630.xsd#ConsolidatedScheduleofInvestmentsinandAdvancestoAffiliatesFootnotesDetails"/>
  <link:presentationLink xlink:role="http://www.mainstcapital.com/role/ConsolidatedScheduleofInvestmentsinandAdvancestoAffiliatesFootnotesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentsInAndAdvancesToAffiliatesScheduleOfInvestmentsAbstract_019e2207-0c30-76c7-ae30-9f9b43939ba7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentsInAndAdvancesToAffiliatesScheduleOfInvestmentsAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentsInAndAdvancesToAffiliatesTable_019e2207-0c30-7431-a709-242e11ff8020" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentsInAndAdvancesToAffiliatesTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentsInAndAdvancesToAffiliatesScheduleOfInvestmentsAbstract_019e2207-0c30-76c7-ae30-9f9b43939ba7" xlink:to="loc_us-gaap_InvestmentsInAndAdvancesToAffiliatesTable_019e2207-0c30-7431-a709-242e11ff8020" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentIssuerAffiliationAxis_019e2207-0c30-7384-a8bc-5470ce8d9ab0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentIssuerAffiliationAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentsInAndAdvancesToAffiliatesTable_019e2207-0c30-7431-a709-242e11ff8020" xlink:to="loc_us-gaap_InvestmentIssuerAffiliationAxis_019e2207-0c30-7384-a8bc-5470ce8d9ab0" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentIssuerAffiliationDomain_019e2207-0c30-782b-b2ac-6b6cb8ff9bfe" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentIssuerAffiliationDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerAffiliationAxis_019e2207-0c30-7384-a8bc-5470ce8d9ab0" xlink:to="loc_us-gaap_InvestmentIssuerAffiliationDomain_019e2207-0c30-782b-b2ac-6b6cb8ff9bfe" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentAffiliatedIssuerControlledMember_019e2207-0c30-71b9-a9ab-70d5b6f0bd18" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentAffiliatedIssuerControlledMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerAffiliationDomain_019e2207-0c30-782b-b2ac-6b6cb8ff9bfe" xlink:to="loc_us-gaap_InvestmentAffiliatedIssuerControlledMember_019e2207-0c30-71b9-a9ab-70d5b6f0bd18" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentAffiliatedIssuerNoncontrolledMember_019e2207-0c30-76ec-a509-376720451f68" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentAffiliatedIssuerNoncontrolledMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentIssuerAffiliationDomain_019e2207-0c30-782b-b2ac-6b6cb8ff9bfe" xlink:to="loc_us-gaap_InvestmentAffiliatedIssuerNoncontrolledMember_019e2207-0c30-76ec-a509-376720451f68" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_019e2207-0c30-7eb9-a3fc-25d9f599a7bf" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_StatementGeographicalAxis"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentsInAndAdvancesToAffiliatesTable_019e2207-0c30-7431-a709-242e11ff8020" xlink:to="loc_srt_StatementGeographicalAxis_019e2207-0c30-7eb9-a3fc-25d9f599a7bf" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_019e2207-0c30-7b0f-acc4-e50cb532267e" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_SegmentGeographicalDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_StatementGeographicalAxis_019e2207-0c30-7eb9-a3fc-25d9f599a7bf" xlink:to="loc_srt_SegmentGeographicalDomain_019e2207-0c30-7b0f-acc4-e50cb532267e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MidwestRegionMember_019e2207-0c30-74c6-b173-6bab92afd2fd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MidwestRegionMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_SegmentGeographicalDomain_019e2207-0c30-7b0f-acc4-e50cb532267e" xlink:to="loc_us-gaap_MidwestRegionMember_019e2207-0c30-74c6-b173-6bab92afd2fd" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_NortheastRegionAndCanadaMember_019e2207-0c30-7076-847e-dbaf5e36f87e" xlink:href="main-20260630.xsd#main_NortheastRegionAndCanadaMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_SegmentGeographicalDomain_019e2207-0c30-7b0f-acc4-e50cb532267e" xlink:to="loc_main_NortheastRegionAndCanadaMember_019e2207-0c30-7076-847e-dbaf5e36f87e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SoutheastRegionMember_019e2207-0c30-77e4-8b7d-5e28a4fcccab" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SoutheastRegionMember"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_SegmentGeographicalDomain_019e2207-0c30-7b0f-acc4-e50cb532267e" xlink:to="loc_us-gaap_SoutheastRegionMember_019e2207-0c30-77e4-8b7d-5e28a4fcccab" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SouthwestRegionMember_019e2207-0c30-77d1-b0df-6fec99864ddd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SouthwestRegionMember"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_SegmentGeographicalDomain_019e2207-0c30-7b0f-acc4-e50cb532267e" xlink:to="loc_us-gaap_SouthwestRegionMember_019e2207-0c30-77d1-b0df-6fec99864ddd" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WestRegionMember_019e2207-0c30-7657-a8da-642c1829c7f0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_WestRegionMember"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_SegmentGeographicalDomain_019e2207-0c30-7b0f-acc4-e50cb532267e" xlink:to="loc_us-gaap_WestRegionMember_019e2207-0c30-7657-a8da-642c1829c7f0" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfInvestmentsLineItems_019e2207-0c30-7980-b385-3a53f225327f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfInvestmentsLineItems"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentsInAndAdvancesToAffiliatesTable_019e2207-0c30-7431-a709-242e11ff8020" xlink:to="loc_us-gaap_ScheduleOfInvestmentsLineItems_019e2207-0c30-7980-b385-3a53f225327f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentOwnedAtFairValue_019e2207-0c30-76c1-8342-eadbb17405a1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentOwnedAtFairValue"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019e2207-0c30-7980-b385-3a53f225327f" xlink:to="loc_us-gaap_InvestmentOwnedAtFairValue_019e2207-0c30-76c1-8342-eadbb17405a1" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_InvestmentsInAndAdvancesToAffiliatesPercentageOfNetAssets_019e2207-0c30-7cf3-be7e-5ccbd416f862" xlink:href="main-20260630.xsd#main_InvestmentsInAndAdvancesToAffiliatesPercentageOfNetAssets"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019e2207-0c30-7980-b385-3a53f225327f" xlink:to="loc_main_InvestmentsInAndAdvancesToAffiliatesPercentageOfNetAssets_019e2207-0c30-7cf3-be7e-5ccbd416f862" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://xbrl.sec.gov/ecd/role/AwardTimingDisclosure" xlink:type="simple" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#AwardTimingDisclosure"/>
  <link:presentationLink xlink:role="http://xbrl.sec.gov/ecd/role/AwardTimingDisclosure" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ecd_AwardTmgDiscLineItems" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_AwardTmgDiscLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_AwardTmgMnpiDiscTextBlock" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_AwardTmgMnpiDiscTextBlock"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_AwardTmgDiscLineItems" xlink:to="loc_ecd_AwardTmgMnpiDiscTextBlock" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_AwardTmgMethodTextBlock" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_AwardTmgMethodTextBlock"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_AwardTmgDiscLineItems" xlink:to="loc_ecd_AwardTmgMethodTextBlock" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_AwardTmgPredtrmndFlag" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_AwardTmgPredtrmndFlag"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_AwardTmgDiscLineItems" xlink:to="loc_ecd_AwardTmgPredtrmndFlag" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_AwardTmgMnpiCnsdrdFlag" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_AwardTmgMnpiCnsdrdFlag"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_AwardTmgDiscLineItems" xlink:to="loc_ecd_AwardTmgMnpiCnsdrdFlag" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_AwardTmgHowMnpiCnsdrdTextBlock" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_AwardTmgHowMnpiCnsdrdTextBlock"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_AwardTmgDiscLineItems" xlink:to="loc_ecd_AwardTmgHowMnpiCnsdrdTextBlock" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_MnpiDiscTimedForCompValFlag" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_MnpiDiscTimedForCompValFlag"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_AwardTmgDiscLineItems" xlink:to="loc_ecd_MnpiDiscTimedForCompValFlag" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_AwardsCloseToMnpiDiscTableTextBlock" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_AwardsCloseToMnpiDiscTableTextBlock"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_AwardTmgDiscLineItems" xlink:to="loc_ecd_AwardsCloseToMnpiDiscTableTextBlock" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_AwardsCloseToMnpiDiscTable" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_AwardsCloseToMnpiDiscTable"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_AwardTmgDiscLineItems" xlink:to="loc_ecd_AwardsCloseToMnpiDiscTable" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_IndividualAxis" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_IndividualAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_AwardsCloseToMnpiDiscTable" xlink:to="loc_ecd_IndividualAxis" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_AllIndividualsMember" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_AllIndividualsMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_IndividualAxis" xlink:to="loc_ecd_AllIndividualsMember" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AwardTypeAxis"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_AwardsCloseToMnpiDiscTable" xlink:to="loc_us-gaap_AwardTypeAxis" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AwardTypeAxis" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EmployeeStockOptionMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:to="loc_us-gaap_EmployeeStockOptionMember" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockAppreciationRightsSARSMember" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockAppreciationRightsSARSMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:to="loc_us-gaap_StockAppreciationRightsSARSMember" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_AwardsCloseToMnpiDiscIndName" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_AwardsCloseToMnpiDiscIndName"/>
    <link:presentationArc order="9" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_AwardTmgDiscLineItems" xlink:to="loc_ecd_AwardsCloseToMnpiDiscIndName" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_AwardUndrlygSecuritiesAmt" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_AwardUndrlygSecuritiesAmt"/>
    <link:presentationArc order="10" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_AwardTmgDiscLineItems" xlink:to="loc_ecd_AwardUndrlygSecuritiesAmt" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_AwardExrcPrice" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_AwardExrcPrice"/>
    <link:presentationArc order="11" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_AwardTmgDiscLineItems" xlink:to="loc_ecd_AwardExrcPrice" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_AwardGrantDateFairValue" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_AwardGrantDateFairValue"/>
    <link:presentationArc order="12" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_AwardTmgDiscLineItems" xlink:to="loc_ecd_AwardGrantDateFairValue" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_UndrlygSecurityMktPriceChngPct" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_UndrlygSecurityMktPriceChngPct"/>
    <link:presentationArc order="13" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_AwardTmgDiscLineItems" xlink:to="loc_ecd_UndrlygSecurityMktPriceChngPct" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://xbrl.sec.gov/ecd/role/ErrCompDisclosure" xlink:type="simple" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ErrCompDisclosure"/>
  <link:presentationLink xlink:role="http://xbrl.sec.gov/ecd/role/ErrCompDisclosure" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ecd_RecoveryOfErrCompDisclosureLineItems" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_RecoveryOfErrCompDisclosureLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_ErrCompRecoveryTable" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_ErrCompRecoveryTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_RecoveryOfErrCompDisclosureLineItems" xlink:to="loc_ecd_ErrCompRecoveryTable" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_RestatementDateAxis" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_RestatementDateAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_ErrCompRecoveryTable" xlink:to="loc_ecd_RestatementDateAxis" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_IndividualAxis" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_IndividualAxis"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_ErrCompRecoveryTable" xlink:to="loc_ecd_IndividualAxis" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_AllIndividualsMember" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_AllIndividualsMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_IndividualAxis" xlink:to="loc_ecd_AllIndividualsMember" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_NonNeosMember" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_NonNeosMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_AllIndividualsMember" xlink:to="loc_ecd_NonNeosMember" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_RestatementDeterminationDate" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_RestatementDeterminationDate"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_RecoveryOfErrCompDisclosureLineItems" xlink:to="loc_ecd_RestatementDeterminationDate" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_AggtErrCompAmt" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_AggtErrCompAmt"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_RecoveryOfErrCompDisclosureLineItems" xlink:to="loc_ecd_AggtErrCompAmt" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_ErrCompAnalysisTextBlock" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_ErrCompAnalysisTextBlock"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_RecoveryOfErrCompDisclosureLineItems" xlink:to="loc_ecd_ErrCompAnalysisTextBlock" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_StkPrcOrTsrEstimationMethodTextBlock" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_StkPrcOrTsrEstimationMethodTextBlock"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_RecoveryOfErrCompDisclosureLineItems" xlink:to="loc_ecd_StkPrcOrTsrEstimationMethodTextBlock" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_OutstandingAggtErrCompAmt" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_OutstandingAggtErrCompAmt"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_RecoveryOfErrCompDisclosureLineItems" xlink:to="loc_ecd_OutstandingAggtErrCompAmt" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_AggtErrCompNotYetDeterminedTextBlock" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_AggtErrCompNotYetDeterminedTextBlock"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_RecoveryOfErrCompDisclosureLineItems" xlink:to="loc_ecd_AggtErrCompNotYetDeterminedTextBlock" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_ForgoneRecoveryIndName" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_ForgoneRecoveryIndName"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_RecoveryOfErrCompDisclosureLineItems" xlink:to="loc_ecd_ForgoneRecoveryIndName" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_ForgoneRecoveryDueToExpenseOfEnforcementAmt" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_ForgoneRecoveryDueToExpenseOfEnforcementAmt"/>
    <link:presentationArc order="9" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_RecoveryOfErrCompDisclosureLineItems" xlink:to="loc_ecd_ForgoneRecoveryDueToExpenseOfEnforcementAmt" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_ForgoneRecoveryDueToViolationOfHomeCountryLawAmt" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_ForgoneRecoveryDueToViolationOfHomeCountryLawAmt"/>
    <link:presentationArc order="10" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_RecoveryOfErrCompDisclosureLineItems" xlink:to="loc_ecd_ForgoneRecoveryDueToViolationOfHomeCountryLawAmt" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_ForgoneRecoveryDueToDisqualificationOfTaxBenefitsAmt" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_ForgoneRecoveryDueToDisqualificationOfTaxBenefitsAmt"/>
    <link:presentationArc order="11" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_RecoveryOfErrCompDisclosureLineItems" xlink:to="loc_ecd_ForgoneRecoveryDueToDisqualificationOfTaxBenefitsAmt" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_ForgoneRecoveryExplanationOfImpracticabilityTextBlock" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_ForgoneRecoveryExplanationOfImpracticabilityTextBlock"/>
    <link:presentationArc order="12" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_RecoveryOfErrCompDisclosureLineItems" xlink:to="loc_ecd_ForgoneRecoveryExplanationOfImpracticabilityTextBlock" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_OutstandingRecoveryIndName" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_OutstandingRecoveryIndName"/>
    <link:presentationArc order="13" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_RecoveryOfErrCompDisclosureLineItems" xlink:to="loc_ecd_OutstandingRecoveryIndName" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_OutstandingRecoveryCompAmt" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_OutstandingRecoveryCompAmt"/>
    <link:presentationArc order="14" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_RecoveryOfErrCompDisclosureLineItems" xlink:to="loc_ecd_OutstandingRecoveryCompAmt" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_RestatementDoesNotRequireRecoveryTextBlock" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_RestatementDoesNotRequireRecoveryTextBlock"/>
    <link:presentationArc order="15" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_RecoveryOfErrCompDisclosureLineItems" xlink:to="loc_ecd_RestatementDoesNotRequireRecoveryTextBlock" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://xbrl.sec.gov/ecd/role/PvpDisclosure" xlink:type="simple" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#PvpDisclosure"/>
  <link:presentationLink xlink:role="http://xbrl.sec.gov/ecd/role/PvpDisclosure" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ecd_PayVsPerformanceDisclosureLineItems" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_PayVsPerformanceDisclosureLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_PvpTable" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_PvpTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_PayVsPerformanceDisclosureLineItems" xlink:to="loc_ecd_PvpTable" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_ExecutiveCategoryAxis" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_ExecutiveCategoryAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_PvpTable" xlink:to="loc_ecd_ExecutiveCategoryAxis" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_AllExecutiveCategoriesMember" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_AllExecutiveCategoriesMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_ExecutiveCategoryAxis" xlink:to="loc_ecd_AllExecutiveCategoriesMember" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_PeoMember" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_PeoMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_AllExecutiveCategoriesMember" xlink:to="loc_ecd_PeoMember" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_NonPeoNeoMember" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_NonPeoNeoMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_AllExecutiveCategoriesMember" xlink:to="loc_ecd_NonPeoNeoMember" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_IndividualAxis" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_IndividualAxis"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_PvpTable" xlink:to="loc_ecd_IndividualAxis" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_AllIndividualsMember" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_AllIndividualsMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_IndividualAxis" xlink:to="loc_ecd_AllIndividualsMember" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_AdjToCompAxis" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_AdjToCompAxis"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_PvpTable" xlink:to="loc_ecd_AdjToCompAxis" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_AllAdjToCompMember" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_AllAdjToCompMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_AdjToCompAxis" xlink:to="loc_ecd_AllAdjToCompMember" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_AggtChngPnsnValInSummryCompstnTblForAplblYrMember" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_AggtChngPnsnValInSummryCompstnTblForAplblYrMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_AllAdjToCompMember" xlink:to="loc_ecd_AggtChngPnsnValInSummryCompstnTblForAplblYrMember" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_AggtPnsnAdjsSvcCstMember" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_AggtPnsnAdjsSvcCstMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_AllAdjToCompMember" xlink:to="loc_ecd_AggtPnsnAdjsSvcCstMember" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_PnsnAdjsSvcCstMember" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_PnsnAdjsSvcCstMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_AggtPnsnAdjsSvcCstMember" xlink:to="loc_ecd_PnsnAdjsSvcCstMember" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_PnsnAdjsPrrSvcCstMember" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_PnsnAdjsPrrSvcCstMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_AggtPnsnAdjsSvcCstMember" xlink:to="loc_ecd_PnsnAdjsPrrSvcCstMember" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_EqtyAwrdsAdjsMember" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_EqtyAwrdsAdjsMember"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_AllAdjToCompMember" xlink:to="loc_ecd_EqtyAwrdsAdjsMember" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_EqtyAwrdsInSummryCompstnTblForAplblYrMember" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_EqtyAwrdsInSummryCompstnTblForAplblYrMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_EqtyAwrdsAdjsMember" xlink:to="loc_ecd_EqtyAwrdsInSummryCompstnTblForAplblYrMember" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_EqtyAwrdsAdjsExclgValRprtdInSummryCompstnTblMember" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_EqtyAwrdsAdjsExclgValRprtdInSummryCompstnTblMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_EqtyAwrdsAdjsMember" xlink:to="loc_ecd_EqtyAwrdsAdjsExclgValRprtdInSummryCompstnTblMember" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_YrEndFrValOfEqtyAwrdsGrntdInCvrdYrOutsdngAndUnvstdMember" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_YrEndFrValOfEqtyAwrdsGrntdInCvrdYrOutsdngAndUnvstdMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_EqtyAwrdsAdjsExclgValRprtdInSummryCompstnTblMember" xlink:to="loc_ecd_YrEndFrValOfEqtyAwrdsGrntdInCvrdYrOutsdngAndUnvstdMember" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_ChngInFrValOfOutsdngAndUnvstdEqtyAwrdsGrntdInPrrYrsMember" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_ChngInFrValOfOutsdngAndUnvstdEqtyAwrdsGrntdInPrrYrsMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_EqtyAwrdsAdjsExclgValRprtdInSummryCompstnTblMember" xlink:to="loc_ecd_ChngInFrValOfOutsdngAndUnvstdEqtyAwrdsGrntdInPrrYrsMember" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_VstngDtFrValOfEqtyAwrdsGrntdAndVstdInCvrdYrMember" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_VstngDtFrValOfEqtyAwrdsGrntdAndVstdInCvrdYrMember"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_EqtyAwrdsAdjsExclgValRprtdInSummryCompstnTblMember" xlink:to="loc_ecd_VstngDtFrValOfEqtyAwrdsGrntdAndVstdInCvrdYrMember" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_ChngInFrValAsOfVstngDtOfPrrYrEqtyAwrdsVstdInCvrdYrMember" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_ChngInFrValAsOfVstngDtOfPrrYrEqtyAwrdsVstdInCvrdYrMember"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_EqtyAwrdsAdjsExclgValRprtdInSummryCompstnTblMember" xlink:to="loc_ecd_ChngInFrValAsOfVstngDtOfPrrYrEqtyAwrdsVstdInCvrdYrMember" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_FrValAsOfPrrYrEndOfEqtyAwrdsGrntdInPrrYrsFldVstngCondsDrngCvrdYrMember" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_FrValAsOfPrrYrEndOfEqtyAwrdsGrntdInPrrYrsFldVstngCondsDrngCvrdYrMember"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_EqtyAwrdsAdjsExclgValRprtdInSummryCompstnTblMember" xlink:to="loc_ecd_FrValAsOfPrrYrEndOfEqtyAwrdsGrntdInPrrYrsFldVstngCondsDrngCvrdYrMember" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_DvddsOrOthrErngsPdOnEqtyAwrdsNtOthrwsRflctdInTtlCompForCvrdYrMember" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_DvddsOrOthrErngsPdOnEqtyAwrdsNtOthrwsRflctdInTtlCompForCvrdYrMember"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_EqtyAwrdsAdjsExclgValRprtdInSummryCompstnTblMember" xlink:to="loc_ecd_DvddsOrOthrErngsPdOnEqtyAwrdsNtOthrwsRflctdInTtlCompForCvrdYrMember" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_MeasureAxis" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_MeasureAxis"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_PvpTable" xlink:to="loc_ecd_MeasureAxis" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_PvpTableTextBlock" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_PvpTableTextBlock"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_PayVsPerformanceDisclosureLineItems" xlink:to="loc_ecd_PvpTableTextBlock" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_CoSelectedMeasureName" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_CoSelectedMeasureName"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_PayVsPerformanceDisclosureLineItems" xlink:to="loc_ecd_CoSelectedMeasureName" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_NamedExecutiveOfficersFnTextBlock" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_NamedExecutiveOfficersFnTextBlock"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_PayVsPerformanceDisclosureLineItems" xlink:to="loc_ecd_NamedExecutiveOfficersFnTextBlock" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_PeerGroupIssuersFnTextBlock" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_PeerGroupIssuersFnTextBlock"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_PayVsPerformanceDisclosureLineItems" xlink:to="loc_ecd_PeerGroupIssuersFnTextBlock" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_ChangedPeerGroupFnTextBlock" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_ChangedPeerGroupFnTextBlock"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_PayVsPerformanceDisclosureLineItems" xlink:to="loc_ecd_ChangedPeerGroupFnTextBlock" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_PeoTotalCompAmt" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_PeoTotalCompAmt"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_PayVsPerformanceDisclosureLineItems" xlink:to="loc_ecd_PeoTotalCompAmt" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_PeoActuallyPaidCompAmt" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_PeoActuallyPaidCompAmt"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_PayVsPerformanceDisclosureLineItems" xlink:to="loc_ecd_PeoActuallyPaidCompAmt" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_AdjToPeoCompFnTextBlock" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_AdjToPeoCompFnTextBlock"/>
    <link:presentationArc order="9" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_PayVsPerformanceDisclosureLineItems" xlink:to="loc_ecd_AdjToPeoCompFnTextBlock" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_NonPeoNeoAvgTotalCompAmt" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_NonPeoNeoAvgTotalCompAmt"/>
    <link:presentationArc order="10" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_PayVsPerformanceDisclosureLineItems" xlink:to="loc_ecd_NonPeoNeoAvgTotalCompAmt" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_NonPeoNeoAvgCompActuallyPaidAmt" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_NonPeoNeoAvgCompActuallyPaidAmt"/>
    <link:presentationArc order="11" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_PayVsPerformanceDisclosureLineItems" xlink:to="loc_ecd_NonPeoNeoAvgCompActuallyPaidAmt" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_AdjToNonPeoNeoCompFnTextBlock" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_AdjToNonPeoNeoCompFnTextBlock"/>
    <link:presentationArc order="12" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_PayVsPerformanceDisclosureLineItems" xlink:to="loc_ecd_AdjToNonPeoNeoCompFnTextBlock" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_EquityValuationAssumptionDifferenceFnTextBlock" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_EquityValuationAssumptionDifferenceFnTextBlock"/>
    <link:presentationArc order="13" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_PayVsPerformanceDisclosureLineItems" xlink:to="loc_ecd_EquityValuationAssumptionDifferenceFnTextBlock" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_CompActuallyPaidVsTotalShareholderRtnTextBlock" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_CompActuallyPaidVsTotalShareholderRtnTextBlock"/>
    <link:presentationArc order="14" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_PayVsPerformanceDisclosureLineItems" xlink:to="loc_ecd_CompActuallyPaidVsTotalShareholderRtnTextBlock" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_CompActuallyPaidVsNetIncomeTextBlock" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_CompActuallyPaidVsNetIncomeTextBlock"/>
    <link:presentationArc order="15" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_PayVsPerformanceDisclosureLineItems" xlink:to="loc_ecd_CompActuallyPaidVsNetIncomeTextBlock" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_CompActuallyPaidVsCoSelectedMeasureTextBlock" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_CompActuallyPaidVsCoSelectedMeasureTextBlock"/>
    <link:presentationArc order="16" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_PayVsPerformanceDisclosureLineItems" xlink:to="loc_ecd_CompActuallyPaidVsCoSelectedMeasureTextBlock" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_TotalShareholderRtnVsPeerGroupTextBlock" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_TotalShareholderRtnVsPeerGroupTextBlock"/>
    <link:presentationArc order="17" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_PayVsPerformanceDisclosureLineItems" xlink:to="loc_ecd_TotalShareholderRtnVsPeerGroupTextBlock" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_CompActuallyPaidVsOtherMeasureTextBlock" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_CompActuallyPaidVsOtherMeasureTextBlock"/>
    <link:presentationArc order="18" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_PayVsPerformanceDisclosureLineItems" xlink:to="loc_ecd_CompActuallyPaidVsOtherMeasureTextBlock" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_TabularListTableTextBlock" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_TabularListTableTextBlock"/>
    <link:presentationArc order="19" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_PayVsPerformanceDisclosureLineItems" xlink:to="loc_ecd_TabularListTableTextBlock" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_TotalShareholderRtnAmt" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_TotalShareholderRtnAmt"/>
    <link:presentationArc order="20" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_PayVsPerformanceDisclosureLineItems" xlink:to="loc_ecd_TotalShareholderRtnAmt" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_PeerGroupTotalShareholderRtnAmt" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_PeerGroupTotalShareholderRtnAmt"/>
    <link:presentationArc order="21" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_PayVsPerformanceDisclosureLineItems" xlink:to="loc_ecd_PeerGroupTotalShareholderRtnAmt" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_CoSelectedMeasureAmt" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_CoSelectedMeasureAmt"/>
    <link:presentationArc order="23" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_PayVsPerformanceDisclosureLineItems" xlink:to="loc_ecd_CoSelectedMeasureAmt" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_OtherPerfMeasureAmt" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_OtherPerfMeasureAmt"/>
    <link:presentationArc order="24" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_PayVsPerformanceDisclosureLineItems" xlink:to="loc_ecd_OtherPerfMeasureAmt" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_AdjToCompAmt" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_AdjToCompAmt"/>
    <link:presentationArc order="25" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_PayVsPerformanceDisclosureLineItems" xlink:to="loc_ecd_AdjToCompAmt" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_PeoName" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_PeoName"/>
    <link:presentationArc order="26" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_PayVsPerformanceDisclosureLineItems" xlink:to="loc_ecd_PeoName" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_MeasureName" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_MeasureName"/>
    <link:presentationArc order="27" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_PayVsPerformanceDisclosureLineItems" xlink:to="loc_ecd_MeasureName" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_NonGaapMeasureDescriptionTextBlock" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_NonGaapMeasureDescriptionTextBlock"/>
    <link:presentationArc order="28" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_PayVsPerformanceDisclosureLineItems" xlink:to="loc_ecd_NonGaapMeasureDescriptionTextBlock" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_Additional402vDisclosureTextBlock" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_Additional402vDisclosureTextBlock"/>
    <link:presentationArc order="29" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_PayVsPerformanceDisclosureLineItems" xlink:to="loc_ecd_Additional402vDisclosureTextBlock" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_PnsnBnftsAdjFnTextBlock" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_PnsnBnftsAdjFnTextBlock"/>
    <link:presentationArc order="30" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_PayVsPerformanceDisclosureLineItems" xlink:to="loc_ecd_PnsnBnftsAdjFnTextBlock" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_EqtyAwrdsAdjFnTextBlock" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_EqtyAwrdsAdjFnTextBlock"/>
    <link:presentationArc order="31" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_PayVsPerformanceDisclosureLineItems" xlink:to="loc_ecd_EqtyAwrdsAdjFnTextBlock" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://xbrl.sec.gov/ecd/role/InsiderTradingArrangements" xlink:type="simple" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#InsiderTradingArrangements"/>
  <link:presentationLink xlink:role="http://xbrl.sec.gov/ecd/role/InsiderTradingArrangements" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ecd_InsiderTradingArrLineItems" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_InsiderTradingArrLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_TradingArrByIndTable" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_TradingArrByIndTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_InsiderTradingArrLineItems" xlink:to="loc_ecd_TradingArrByIndTable" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_TradingArrAxis" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_TradingArrAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_TradingArrByIndTable" xlink:to="loc_ecd_TradingArrAxis" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_AllTradingArrangementsMember" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_AllTradingArrangementsMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_TradingArrAxis" xlink:to="loc_ecd_AllTradingArrangementsMember" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_IndividualAxis" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_IndividualAxis"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_TradingArrByIndTable" xlink:to="loc_ecd_IndividualAxis" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_AllIndividualsMember" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_AllIndividualsMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_IndividualAxis" xlink:to="loc_ecd_AllIndividualsMember" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_MtrlTermsOfTrdArrTextBlock" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_MtrlTermsOfTrdArrTextBlock"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_InsiderTradingArrLineItems" xlink:to="loc_ecd_MtrlTermsOfTrdArrTextBlock" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_TrdArrIndName" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_TrdArrIndName"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_InsiderTradingArrLineItems" xlink:to="loc_ecd_TrdArrIndName" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_TrdArrIndTitle" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_TrdArrIndTitle"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_InsiderTradingArrLineItems" xlink:to="loc_ecd_TrdArrIndTitle" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_Rule10b51ArrAdoptedFlag" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_Rule10b51ArrAdoptedFlag"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_InsiderTradingArrLineItems" xlink:to="loc_ecd_Rule10b51ArrAdoptedFlag" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_NonRule10b51ArrAdoptedFlag" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_NonRule10b51ArrAdoptedFlag"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_InsiderTradingArrLineItems" xlink:to="loc_ecd_NonRule10b51ArrAdoptedFlag" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_TrdArrAdoptionDate" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_TrdArrAdoptionDate"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_InsiderTradingArrLineItems" xlink:to="loc_ecd_TrdArrAdoptionDate" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_Rule10b51ArrTrmntdFlag" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_Rule10b51ArrTrmntdFlag"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_InsiderTradingArrLineItems" xlink:to="loc_ecd_Rule10b51ArrTrmntdFlag" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_NonRule10b51ArrTrmntdFlag" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_NonRule10b51ArrTrmntdFlag"/>
    <link:presentationArc order="9" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_InsiderTradingArrLineItems" xlink:to="loc_ecd_NonRule10b51ArrTrmntdFlag" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_TrdArrTerminationDate" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_TrdArrTerminationDate"/>
    <link:presentationArc order="10" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_InsiderTradingArrLineItems" xlink:to="loc_ecd_TrdArrTerminationDate" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_TrdArrExpirationDate" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_TrdArrExpirationDate"/>
    <link:presentationArc order="11" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_InsiderTradingArrLineItems" xlink:to="loc_ecd_TrdArrExpirationDate" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_TrdArrDuration" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_TrdArrDuration"/>
    <link:presentationArc order="12" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_InsiderTradingArrLineItems" xlink:to="loc_ecd_TrdArrDuration" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_TrdArrSecuritiesAggAvailAmt" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_TrdArrSecuritiesAggAvailAmt"/>
    <link:presentationArc order="13" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_InsiderTradingArrLineItems" xlink:to="loc_ecd_TrdArrSecuritiesAggAvailAmt" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://xbrl.sec.gov/ecd/role/InsiderTradingPoliciesProc" xlink:type="simple" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#InsiderTradingPoliciesProc"/>
  <link:presentationLink xlink:role="http://xbrl.sec.gov/ecd/role/InsiderTradingPoliciesProc" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ecd_InsiderTradingPoliciesProcLineItems" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_InsiderTradingPoliciesProcLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_InsiderTrdPoliciesProcAdoptedFlag" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_InsiderTrdPoliciesProcAdoptedFlag"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_InsiderTradingPoliciesProcLineItems" xlink:to="loc_ecd_InsiderTrdPoliciesProcAdoptedFlag" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecd_InsiderTrdPoliciesProcNotAdoptedTextBlock" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_InsiderTrdPoliciesProcNotAdoptedTextBlock"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ecd_InsiderTradingPoliciesProcLineItems" xlink:to="loc_ecd_InsiderTrdPoliciesProcNotAdoptedTextBlock" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://xbrl.sec.gov/cef/role/N2" xlink:type="simple" xlink:href="https://xbrl.sec.gov/cef/2026/cef-2026.xsd#N2"/>
  <link:presentationLink xlink:role="http://xbrl.sec.gov/cef/role/N2" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_CorporateFacilityMember" xlink:href="main-20260630.xsd#main_CorporateFacilityMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain" xlink:to="loc_main_CorporateFacilityMember" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/label"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_SPVFacilityMember" xlink:href="main-20260630.xsd#main_SPVFacilityMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain" xlink:to="loc_main_SPVFacilityMember" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/label"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_March2029NotesMember" xlink:href="main-20260630.xsd#main_March2029NotesMember"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain" xlink:to="loc_main_March2029NotesMember" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/label"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_July2026NotesMember" xlink:href="main-20260630.xsd#main_July2026NotesMember"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain" xlink:to="loc_main_July2026NotesMember" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/label"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_June2027NotesMember" xlink:href="main-20260630.xsd#main_June2027NotesMember"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain" xlink:to="loc_main_June2027NotesMember" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/label"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_August2028NotesMember" xlink:href="main-20260630.xsd#main_August2028NotesMember"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain" xlink:to="loc_main_August2028NotesMember" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/label"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_SBICDebenturesMember" xlink:href="main-20260630.xsd#main_SBICDebenturesMember"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain" xlink:to="loc_main_SBICDebenturesMember" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/label"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_April2031NotesMember" xlink:href="main-20260630.xsd#main_April2031NotesMember"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain" xlink:to="loc_main_April2031NotesMember" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/label"/>
    <link:loc xlink:type="locator" xlink:label="loc_main_December2025NotesMember" xlink:href="main-20260630.xsd#main_December2025NotesMember"/>
    <link:presentationArc order="9" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain" xlink:to="loc_main_December2025NotesMember" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/label"/>
  </link:presentationLink>
</link:linkbase>
