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

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:019fae07-2d4d-7bf9-8365-44e66dda4651,g:9393ac6e-5a55-407e-877c-4624849c9158-->
<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.seic.com/role/Cover" xlink:type="simple" xlink:href="seic-20261021.xsd#Cover"/>
  <link:presentationLink xlink:role="http://www.seic.com/role/Cover" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_dei_CoverAbstract_019fae07-2d4d-77af-b7ae-ca86cd61e253" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_CoverAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentType_019fae07-2d4d-7f09-9089-f9e311eef90a" 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_019fae07-2d4d-77af-b7ae-ca86cd61e253" xlink:to="loc_dei_DocumentType_019fae07-2d4d-7f09-9089-f9e311eef90a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentPeriodEndDate_019fae07-2d4d-7767-943f-2df3202e6744" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentPeriodEndDate"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019fae07-2d4d-77af-b7ae-ca86cd61e253" xlink:to="loc_dei_DocumentPeriodEndDate_019fae07-2d4d-7767-943f-2df3202e6744" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityRegistrantName_019fae07-2d4d-7dcc-9bda-faf02746b982" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityRegistrantName"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019fae07-2d4d-77af-b7ae-ca86cd61e253" xlink:to="loc_dei_EntityRegistrantName_019fae07-2d4d-7dcc-9bda-faf02746b982" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCentralIndexKey_019fae07-2d4d-7841-9e96-7dbd35b6b752" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityCentralIndexKey"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019fae07-2d4d-77af-b7ae-ca86cd61e253" xlink:to="loc_dei_EntityCentralIndexKey_019fae07-2d4d-7841-9e96-7dbd35b6b752" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AmendmentFlag_019fae07-2d4d-73bc-a5d8-1fee9d11fd61" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_AmendmentFlag"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019fae07-2d4d-77af-b7ae-ca86cd61e253" xlink:to="loc_dei_AmendmentFlag_019fae07-2d4d-73bc-a5d8-1fee9d11fd61" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityIncorporationStateCountryCode_019fae07-2d4d-7d88-b618-e35ced7ecb4e" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityIncorporationStateCountryCode"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019fae07-2d4d-77af-b7ae-ca86cd61e253" xlink:to="loc_dei_EntityIncorporationStateCountryCode_019fae07-2d4d-7d88-b618-e35ced7ecb4e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFileNumber_019fae07-2d4d-7fda-bce5-a96eeb91b17c" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityFileNumber"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019fae07-2d4d-77af-b7ae-ca86cd61e253" xlink:to="loc_dei_EntityFileNumber_019fae07-2d4d-7fda-bce5-a96eeb91b17c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityTaxIdentificationNumber_019fae07-2d4d-7a9e-aa92-250d128f7563" 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_019fae07-2d4d-77af-b7ae-ca86cd61e253" xlink:to="loc_dei_EntityTaxIdentificationNumber_019fae07-2d4d-7a9e-aa92-250d128f7563" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine1_019fae07-2d4d-7ffc-a1a3-3f2b5083c166" 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_019fae07-2d4d-77af-b7ae-ca86cd61e253" xlink:to="loc_dei_EntityAddressAddressLine1_019fae07-2d4d-7ffc-a1a3-3f2b5083c166" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCityOrTown_019fae07-2d4d-7eb9-9a81-ded11aac780c" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressCityOrTown"/>
    <link:presentationArc order="10" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019fae07-2d4d-77af-b7ae-ca86cd61e253" xlink:to="loc_dei_EntityAddressCityOrTown_019fae07-2d4d-7eb9-9a81-ded11aac780c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressStateOrProvince_019fae07-2d4d-7eaf-9bde-468af3bf4dcc" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressStateOrProvince"/>
    <link:presentationArc order="11" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019fae07-2d4d-77af-b7ae-ca86cd61e253" xlink:to="loc_dei_EntityAddressStateOrProvince_019fae07-2d4d-7eaf-9bde-468af3bf4dcc" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressPostalZipCode_019fae07-2d4d-7cc0-9815-5c2ed1337cca" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressPostalZipCode"/>
    <link:presentationArc order="12" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019fae07-2d4d-77af-b7ae-ca86cd61e253" xlink:to="loc_dei_EntityAddressPostalZipCode_019fae07-2d4d-7cc0-9815-5c2ed1337cca" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CityAreaCode_019fae07-2d4d-75b6-904a-06e97aadc202" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_CityAreaCode"/>
    <link:presentationArc order="13" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019fae07-2d4d-77af-b7ae-ca86cd61e253" xlink:to="loc_dei_CityAreaCode_019fae07-2d4d-75b6-904a-06e97aadc202" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LocalPhoneNumber_019fae07-2d4d-7540-ad76-5a721b7b728e" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LocalPhoneNumber"/>
    <link:presentationArc order="14" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019fae07-2d4d-77af-b7ae-ca86cd61e253" xlink:to="loc_dei_LocalPhoneNumber_019fae07-2d4d-7540-ad76-5a721b7b728e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_WrittenCommunications_019fae07-2d4d-7a1c-9a06-a4134358692c" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_WrittenCommunications"/>
    <link:presentationArc order="15" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019fae07-2d4d-77af-b7ae-ca86cd61e253" xlink:to="loc_dei_WrittenCommunications_019fae07-2d4d-7a1c-9a06-a4134358692c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SolicitingMaterial_019fae07-2d4d-70db-8252-ad90abae7859" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_SolicitingMaterial"/>
    <link:presentationArc order="16" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019fae07-2d4d-77af-b7ae-ca86cd61e253" xlink:to="loc_dei_SolicitingMaterial_019fae07-2d4d-70db-8252-ad90abae7859" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_PreCommencementTenderOffer_019fae07-2d4d-7c36-b23f-477a1fc20df9" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_PreCommencementTenderOffer"/>
    <link:presentationArc order="17" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019fae07-2d4d-77af-b7ae-ca86cd61e253" xlink:to="loc_dei_PreCommencementTenderOffer_019fae07-2d4d-7c36-b23f-477a1fc20df9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_PreCommencementIssuerTenderOffer_019fae07-2d4d-793a-9dcf-c50c91c18a07" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_PreCommencementIssuerTenderOffer"/>
    <link:presentationArc order="18" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019fae07-2d4d-77af-b7ae-ca86cd61e253" xlink:to="loc_dei_PreCommencementIssuerTenderOffer_019fae07-2d4d-793a-9dcf-c50c91c18a07" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_Security12bTitle_019fae07-2d4d-7a21-a3a4-73a48b0c6b36" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_Security12bTitle"/>
    <link:presentationArc order="19" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019fae07-2d4d-77af-b7ae-ca86cd61e253" xlink:to="loc_dei_Security12bTitle_019fae07-2d4d-7a21-a3a4-73a48b0c6b36" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_TradingSymbol_019fae07-2d4d-7cb0-a4fa-0e615ba63b4f" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_TradingSymbol"/>
    <link:presentationArc order="20" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019fae07-2d4d-77af-b7ae-ca86cd61e253" xlink:to="loc_dei_TradingSymbol_019fae07-2d4d-7cb0-a4fa-0e615ba63b4f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SecurityExchangeName_019fae07-2d4d-7ee3-9f34-a7bd965aa362" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_SecurityExchangeName"/>
    <link:presentationArc order="21" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019fae07-2d4d-77af-b7ae-ca86cd61e253" xlink:to="loc_dei_SecurityExchangeName_019fae07-2d4d-7ee3-9f34-a7bd965aa362" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityEmergingGrowthCompany_019fae07-2d4d-7c72-a106-74c8b49d3827" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityEmergingGrowthCompany"/>
    <link:presentationArc order="22" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019fae07-2d4d-77af-b7ae-ca86cd61e253" xlink:to="loc_dei_EntityEmergingGrowthCompany_019fae07-2d4d-7c72-a106-74c8b49d3827" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
</link:linkbase>
