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

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:019fec0a-f9ba-7a5d-b3a5-f3d1cd15cbe9,g:d65256b9-2fb6-476c-975f-8b376a8207f1-->
<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:arcroleRef arcroleURI="https://xbrl.org/2023/arcrole/summation-item" xlink:type="simple" xlink:href="https://www.xbrl.org/2023/calculation-1.1.xsd#summation-item"/>
  <link:roleRef roleURI="http://www.hamiltongroup.com/role/UnauditedCondensedConsolidatedBalanceSheets" xlink:type="simple" xlink:href="hg-20260930.xsd#UnauditedCondensedConsolidatedBalanceSheets"/>
  <link:calculationLink xlink:role="http://www.hamiltongroup.com/role/UnauditedCondensedConsolidatedBalanceSheets" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Investments_019fec0a-fb89-7339-b281-0f8b906d64c0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Investments"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradingSecuritiesDebt_019fec0a-fb89-78e0-9bd6-7748c1a708a9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TradingSecuritiesDebt"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Investments_019fec0a-fb89-7339-b281-0f8b906d64c0" xlink:to="loc_us-gaap_TradingSecuritiesDebt_019fec0a-fb89-78e0-9bd6-7748c1a708a9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AlternativeInvestment_019fec0a-fb89-722c-bf80-2cd6b369149e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AlternativeInvestment"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Investments_019fec0a-fb89-7339-b281-0f8b906d64c0" xlink:to="loc_us-gaap_AlternativeInvestment_019fec0a-fb89-722c-bf80-2cd6b369149e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_019fec0a-fb89-78ac-be2b-6a80634378d5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Assets"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReinsuranceRecoverablesOnPaidLosses_019fec0a-fb89-7914-b374-5ebd8c3c3e31" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ReinsuranceRecoverablesOnPaidLosses"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_019fec0a-fb89-78ac-be2b-6a80634378d5" xlink:to="loc_us-gaap_ReinsuranceRecoverablesOnPaidLosses_019fec0a-fb89-7914-b374-5ebd8c3c3e31" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_019fec0a-fb89-7325-85c2-d2461bb94c55" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_019fec0a-fb89-78ac-be2b-6a80634378d5" xlink:to="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_019fec0a-fb89-7325-85c2-d2461bb94c55" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredPolicyAcquisitionCosts_019fec0a-fb89-7bd1-a8e7-a1ae6d74f40f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DeferredPolicyAcquisitionCosts"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_019fec0a-fb89-78ac-be2b-6a80634378d5" xlink:to="loc_us-gaap_DeferredPolicyAcquisitionCosts_019fec0a-fb89-7bd1-a8e7-a1ae6d74f40f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PremiumsReceivableAtCarryingValue_019fec0a-fb89-704c-a716-6ccd926e3800" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PremiumsReceivableAtCarryingValue"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_019fec0a-fb89-78ac-be2b-6a80634378d5" xlink:to="loc_us-gaap_PremiumsReceivableAtCarryingValue_019fec0a-fb89-704c-a716-6ccd926e3800" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrepaidReinsurancePremiums_019fec0a-fb89-7cb2-951b-17a9560faa88" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PrepaidReinsurancePremiums"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_019fec0a-fb89-78ac-be2b-6a80634378d5" xlink:to="loc_us-gaap_PrepaidReinsurancePremiums_019fec0a-fb89-7cb2-951b-17a9560faa88" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssets_019fec0a-fb89-74b2-ab27-09883eecc574" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherAssets"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_019fec0a-fb89-78ac-be2b-6a80634378d5" xlink:to="loc_us-gaap_OtherAssets_019fec0a-fb89-74b2-ab27-09883eecc574" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Investments_019fec0a-fb89-7847-86bd-402db342bcfa" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Investments"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_019fec0a-fb89-78ac-be2b-6a80634378d5" xlink:to="loc_us-gaap_Investments_019fec0a-fb89-7847-86bd-402db342bcfa" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReceivablesFromBrokersDealersAndClearingOrganizations_019fec0a-fb89-730b-a156-ef880121b4f7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ReceivablesFromBrokersDealersAndClearingOrganizations"/>
    <link:calculationArc order="8" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_019fec0a-fb89-78ac-be2b-6a80634378d5" xlink:to="loc_us-gaap_ReceivablesFromBrokersDealersAndClearingOrganizations_019fec0a-fb89-730b-a156-ef880121b4f7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalents_019fec0a-fb89-7b15-b82c-808e09fd5723" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestrictedCashAndCashEquivalents"/>
    <link:calculationArc order="9" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_019fec0a-fb89-78ac-be2b-6a80634378d5" xlink:to="loc_us-gaap_RestrictedCashAndCashEquivalents_019fec0a-fb89-7b15-b82c-808e09fd5723" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReinsuranceRecoverableForUnpaidClaimsAndClaimsAdjustments_019fec0a-fb89-7624-91ad-7180a9f32055" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ReinsuranceRecoverableForUnpaidClaimsAndClaimsAdjustments"/>
    <link:calculationArc order="10" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_019fec0a-fb89-78ac-be2b-6a80634378d5" xlink:to="loc_us-gaap_ReinsuranceRecoverableForUnpaidClaimsAndClaimsAdjustments_019fec0a-fb89-7624-91ad-7180a9f32055" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_019fec0a-fb89-7979-af0b-d0874e5d2170" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:calculationArc order="11" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_019fec0a-fb89-78ac-be2b-6a80634378d5" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_019fec0a-fb89-7979-af0b-d0874e5d2170" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_019fec0a-fb89-7a44-8833-bd3652bb5a19" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilitiesAndStockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_019fec0a-fb89-79f1-84df-b457dd38cc9b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Liabilities"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_019fec0a-fb89-7a44-8833-bd3652bb5a19" xlink:to="loc_us-gaap_Liabilities_019fec0a-fb89-79f1-84df-b457dd38cc9b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_019fec0a-fb89-7cd3-bcbd-57f222bc7830" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquity"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_019fec0a-fb89-7a44-8833-bd3652bb5a19" xlink:to="loc_us-gaap_StockholdersEquity_019fec0a-fb89-7cd3-bcbd-57f222bc7830" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount_019fec0a-fb89-7a00-b913-6dd4f8e3477a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_019fec0a-fb89-7a44-8833-bd3652bb5a19" xlink:to="loc_us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount_019fec0a-fb89-7a00-b913-6dd4f8e3477a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_019fec0a-fb89-73d0-9845-a1b8a61907b3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_019fec0a-fb89-7e4a-8811-a03c49a25961" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_019fec0a-fb89-73d0-9845-a1b8a61907b3" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_019fec0a-fb89-7e4a-8811-a03c49a25961" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockValue_019fec0a-fb89-7b88-a880-e19df10b0b41" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockValue"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_019fec0a-fb89-73d0-9845-a1b8a61907b3" xlink:to="loc_us-gaap_CommonStockValue_019fec0a-fb89-7b88-a880-e19df10b0b41" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_019fec0a-fb89-7c57-ab2c-de34a598e75c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetainedEarningsAccumulatedDeficit"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_019fec0a-fb89-73d0-9845-a1b8a61907b3" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_019fec0a-fb89-7c57-ab2c-de34a598e75c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapital_019fec0a-fb89-72b1-b43d-dbb749393a00" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdditionalPaidInCapital"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_019fec0a-fb89-73d0-9845-a1b8a61907b3" xlink:to="loc_us-gaap_AdditionalPaidInCapital_019fec0a-fb89-72b1-b43d-dbb749393a00" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_019fec0a-fb89-7cd6-9043-81b304649bd0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Liabilities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilities_019fec0a-fb89-766e-a4fd-00265661bb48" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherLiabilities"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_019fec0a-fb89-7cd6-9043-81b304649bd0" xlink:to="loc_us-gaap_OtherLiabilities_019fec0a-fb89-766e-a4fd-00265661bb48" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_PayablesToBrokerDealersAndClearingOrganizations_019fec0a-fb89-7e47-b0a5-fd521c566cb0" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_PayablesToBrokerDealersAndClearingOrganizations"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_019fec0a-fb89-7cd6-9043-81b304649bd0" xlink:to="loc_srt_PayablesToBrokerDealersAndClearingOrganizations_019fec0a-fb89-7e47-b0a5-fd521c566cb0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent_019fec0a-fb89-745e-b8e2-89c0b35947bf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_019fec0a-fb89-7cd6-9043-81b304649bd0" xlink:to="loc_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent_019fec0a-fb89-745e-b8e2-89c0b35947bf" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReinsurancePayable_019fec0a-fb89-7a13-9f0c-5bc3e867457a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ReinsurancePayable"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_019fec0a-fb89-7cd6-9043-81b304649bd0" xlink:to="loc_us-gaap_ReinsurancePayable_019fec0a-fb89-7a13-9f0c-5bc3e867457a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense_019fec0a-fb89-7d44-9b18-35baa91675ee" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_019fec0a-fb89-7cd6-9043-81b304649bd0" xlink:to="loc_us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense_019fec0a-fb89-7d44-9b18-35baa91675ee" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_019fec0a-fb89-7577-a599-0e50c45b80f0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermDebt"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_019fec0a-fb89-7cd6-9043-81b304649bd0" xlink:to="loc_us-gaap_LongTermDebt_019fec0a-fb89-7577-a599-0e50c45b80f0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnearnedPremiums_019fec0a-fb89-7e06-b849-b13b5d86864c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_UnearnedPremiums"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_019fec0a-fb89-7cd6-9043-81b304649bd0" xlink:to="loc_us-gaap_UnearnedPremiums_019fec0a-fb89-7e06-b849-b13b5d86864c" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.hamiltongroup.com/role/UnauditedCondensedConsolidatedStatementsofOperationsandComprehensiveIncomeLoss" xlink:type="simple" xlink:href="hg-20260930.xsd#UnauditedCondensedConsolidatedStatementsofOperationsandComprehensiveIncomeLoss"/>
  <link:calculationLink xlink:role="http://www.hamiltongroup.com/role/UnauditedCondensedConsolidatedStatementsofOperationsandComprehensiveIncomeLoss" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_hg_GainLossOnInvestmentsAndNetInvestmentIncome_019fec0a-fb89-7cb8-a1cb-0a06e7fa03a0" xlink:href="hg-20260930.xsd#hg_GainLossOnInvestmentsAndNetInvestmentIncome"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentIncomeNet_019fec0a-fb89-71c0-b413-5da02adb0f12" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentIncomeNet"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_hg_GainLossOnInvestmentsAndNetInvestmentIncome_019fec0a-fb89-7cb8-a1cb-0a06e7fa03a0" xlink:to="loc_us-gaap_InvestmentIncomeNet_019fec0a-fb89-71c0-b413-5da02adb0f12" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnInvestments_019fec0a-fb89-75f2-8a0e-ff0f27503896" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GainLossOnInvestments"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_hg_GainLossOnInvestmentsAndNetInvestmentIncome_019fec0a-fb89-7cb8-a1cb-0a06e7fa03a0" xlink:to="loc_us-gaap_GainLossOnInvestments_019fec0a-fb89-75f2-8a0e-ff0f27503896" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest_019fec0a-fb89-759d-9e46-c2b801d28c47" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest_019fec0a-fb89-750c-be84-3580f148066c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest_019fec0a-fb89-759d-9e46-c2b801d28c47" xlink:to="loc_us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest_019fec0a-fb89-750c-be84-3580f148066c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_019fec0a-fb89-7495-86f1-9c8eaea8d3f0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProfitLoss"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest_019fec0a-fb89-759d-9e46-c2b801d28c47" xlink:to="loc_us-gaap_ProfitLoss_019fec0a-fb89-7495-86f1-9c8eaea8d3f0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PremiumsEarnedNet_019fec0a-fb89-7ed5-8652-3bbab9662c1e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PremiumsEarnedNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PremiumsWrittenNet_019fec0a-fb89-7868-8df5-1c72cd9ba59d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PremiumsWrittenNet"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_PremiumsEarnedNet_019fec0a-fb89-7ed5-8652-3bbab9662c1e" xlink:to="loc_us-gaap_PremiumsWrittenNet_019fec0a-fb89-7868-8df5-1c72cd9ba59d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInUnearnedPremiumsNet_019fec0a-fb89-76d3-9e12-db55001cb5c2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInUnearnedPremiumsNet"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_PremiumsEarnedNet_019fec0a-fb89-7ed5-8652-3bbab9662c1e" xlink:to="loc_us-gaap_IncreaseDecreaseInUnearnedPremiumsNet_019fec0a-fb89-76d3-9e12-db55001cb5c2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_019fec0a-fb89-7dd2-a65a-4dbf51e02851" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProfitLoss"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019fec0a-fb89-7dea-88f1-0945bff517cf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_ProfitLoss_019fec0a-fb89-7dd2-a65a-4dbf51e02851" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019fec0a-fb89-7dea-88f1-0945bff517cf" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_019fec0a-fb89-769c-91a1-ed68a07eaba7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_ProfitLoss_019fec0a-fb89-7dd2-a65a-4dbf51e02851" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_019fec0a-fb89-769c-91a1-ed68a07eaba7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PremiumsWrittenNet_019fec0a-fb89-7799-8ca8-4fe6b96d4e67" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PremiumsWrittenNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PremiumsWrittenGross_019fec0a-fb89-7603-b5ca-1aef359497d5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PremiumsWrittenGross"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_PremiumsWrittenNet_019fec0a-fb89-7799-8ca8-4fe6b96d4e67" xlink:to="loc_us-gaap_PremiumsWrittenGross_019fec0a-fb89-7603-b5ca-1aef359497d5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CededPremiumsWritten_019fec0a-fb89-742f-aca7-504b65f02011" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CededPremiumsWritten"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_PremiumsWrittenNet_019fec0a-fb89-7799-8ca8-4fe6b96d4e67" xlink:to="loc_us-gaap_CededPremiumsWritten_019fec0a-fb89-742f-aca7-504b65f02011" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BenefitsLossesAndExpenses_019fec0a-fb89-7b10-9668-3b60f070f36b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BenefitsLossesAndExpenses"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpense_019fec0a-fb89-717a-8152-02f6631cc296" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestExpense"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_BenefitsLossesAndExpenses_019fec0a-fb89-7b10-9668-3b60f070f36b" xlink:to="loc_us-gaap_InterestExpense_019fec0a-fb89-717a-8152-02f6631cc296" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1_019fec0a-fb89-78ca-b1ec-48c1acac3212" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_BenefitsLossesAndExpenses_019fec0a-fb89-7b10-9668-3b60f070f36b" xlink:to="loc_us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1_019fec0a-fb89-78ca-b1ec-48c1acac3212" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense_019fec0a-fb89-7aba-a4ce-6869e258beb3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_BenefitsLossesAndExpenses_019fec0a-fb89-7b10-9668-3b60f070f36b" xlink:to="loc_us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense_019fec0a-fb89-7aba-a4ce-6869e258beb3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpense_019fec0a-fb89-73d7-90b4-2c9386405927" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SellingGeneralAndAdministrativeExpense"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_BenefitsLossesAndExpenses_019fec0a-fb89-7b10-9668-3b60f070f36b" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpense_019fec0a-fb89-73d7-90b4-2c9386405927" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_019fec0a-fb89-76c7-96ce-53dc486c9bae" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AmortizationOfIntangibleAssets"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_BenefitsLossesAndExpenses_019fec0a-fb89-7b10-9668-3b60f070f36b" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_019fec0a-fb89-76c7-96ce-53dc486c9bae" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019fec0a-fb89-7f3b-a0e8-47f8066e5795" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BenefitsLossesAndExpenses_019fec0a-fb89-7ed5-85e6-1511c51f68d0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BenefitsLossesAndExpenses"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019fec0a-fb89-7f3b-a0e8-47f8066e5795" xlink:to="loc_us-gaap_BenefitsLossesAndExpenses_019fec0a-fb89-7ed5-85e6-1511c51f68d0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_019fec0a-fb89-781b-bd3d-8d117fc9bd62" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Revenues"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019fec0a-fb89-7f3b-a0e8-47f8066e5795" xlink:to="loc_us-gaap_Revenues_019fec0a-fb89-781b-bd3d-8d117fc9bd62" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_019fec0a-fb89-7a9a-b5d9-f79a78663ff0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Revenues"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignCurrencyTransactionGainLossBeforeTax_019fec0a-fb89-72ae-9ed5-a0330030efd9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ForeignCurrencyTransactionGainLossBeforeTax"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Revenues_019fec0a-fb89-7a9a-b5d9-f79a78663ff0" xlink:to="loc_us-gaap_ForeignCurrencyTransactionGainLossBeforeTax_019fec0a-fb89-72ae-9ed5-a0330030efd9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherIncome_019fec0a-fb89-7222-9eaa-2e2325d8e2df" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherIncome"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Revenues_019fec0a-fb89-7a9a-b5d9-f79a78663ff0" xlink:to="loc_us-gaap_OtherIncome_019fec0a-fb89-7222-9eaa-2e2325d8e2df" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_hg_GainLossOnInvestmentsAndNetInvestmentIncome_019fec0a-fb89-7cd8-b076-efa73c86689f" xlink:href="hg-20260930.xsd#hg_GainLossOnInvestmentsAndNetInvestmentIncome"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Revenues_019fec0a-fb89-7a9a-b5d9-f79a78663ff0" xlink:to="loc_hg_GainLossOnInvestmentsAndNetInvestmentIncome_019fec0a-fb89-7cd8-b076-efa73c86689f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PremiumsEarnedNet_019fec0a-fb89-71ce-aeaa-d378b4d89e3f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PremiumsEarnedNet"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Revenues_019fec0a-fb89-7a9a-b5d9-f79a78663ff0" xlink:to="loc_us-gaap_PremiumsEarnedNet_019fec0a-fb89-71ce-aeaa-d378b4d89e3f" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.hamiltongroup.com/role/UnauditedCondensedConsolidatedStatementsofCashFlows" xlink:type="simple" xlink:href="hg-20260930.xsd#UnauditedCondensedConsolidatedStatementsofCashFlows"/>
  <link:calculationLink xlink:role="http://www.hamiltongroup.com/role/UnauditedCondensedConsolidatedStatementsofCashFlows" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_019fec0a-fb89-76fc-82ee-83530ae41fbd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_hg_PaymentsRelatedToChangeInPayablesForInvestmentsPurchased_019fec0a-fb89-7878-87f0-bf8fc1d1fb1d" xlink:href="hg-20260930.xsd#hg_PaymentsRelatedToChangeInPayablesForInvestmentsPurchased"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_019fec0a-fb89-76fc-82ee-83530ae41fbd" xlink:to="loc_hg_PaymentsRelatedToChangeInPayablesForInvestmentsPurchased_019fec0a-fb89-7878-87f0-bf8fc1d1fb1d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSaleOfOtherInvestments_019fec0a-fb89-7c2b-abfb-7c8f4e69704a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromSaleOfOtherInvestments"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_019fec0a-fb89-76fc-82ee-83530ae41fbd" xlink:to="loc_us-gaap_ProceedsFromSaleOfOtherInvestments_019fec0a-fb89-7c2b-abfb-7c8f4e69704a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireOtherInvestments_019fec0a-fb89-7c63-946b-293e2ade72b7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsToAcquireOtherInvestments"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_019fec0a-fb89-76fc-82ee-83530ae41fbd" xlink:to="loc_us-gaap_PaymentsToAcquireOtherInvestments_019fec0a-fb89-7c63-946b-293e2ade72b7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSaleOfShortTermInvestments_019fec0a-fb89-7fdd-9215-01d2481dc447" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromSaleOfShortTermInvestments"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_019fec0a-fb89-76fc-82ee-83530ae41fbd" xlink:to="loc_us-gaap_ProceedsFromSaleOfShortTermInvestments_019fec0a-fb89-7fdd-9215-01d2481dc447" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireTradingSecuritiesHeldforinvestment_019fec0a-fb89-78d9-bb3f-28482c580ad8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsToAcquireTradingSecuritiesHeldforinvestment"/>
    <link:calculationArc order="5" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_019fec0a-fb89-76fc-82ee-83530ae41fbd" xlink:to="loc_us-gaap_PaymentsToAcquireTradingSecuritiesHeldforinvestment_019fec0a-fb89-78d9-bb3f-28482c580ad8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_019fec0a-fb89-7bcc-9182-c70f15f72dab" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsForProceedsFromOtherInvestingActivities"/>
    <link:calculationArc order="6" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_019fec0a-fb89-76fc-82ee-83530ae41fbd" xlink:to="loc_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_019fec0a-fb89-7bcc-9182-c70f15f72dab" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSaleAndMaturityOfTradingSecuritiesHeldforinvestment_019fec0a-fb89-7e49-b036-a65a42ade6ac" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromSaleAndMaturityOfTradingSecuritiesHeldforinvestment"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_019fec0a-fb89-76fc-82ee-83530ae41fbd" xlink:to="loc_us-gaap_ProceedsFromSaleAndMaturityOfTradingSecuritiesHeldforinvestment_019fec0a-fb89-7e49-b036-a65a42ade6ac" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_hg_ProceedsRelatedToChangeInReceivablesForInvestmentsSold_019fec0a-fb89-7b4c-b24e-3ee433c379c2" xlink:href="hg-20260930.xsd#hg_ProceedsRelatedToChangeInReceivablesForInvestmentsSold"/>
    <link:calculationArc order="8" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_019fec0a-fb89-76fc-82ee-83530ae41fbd" xlink:to="loc_hg_ProceedsRelatedToChangeInReceivablesForInvestmentsSold_019fec0a-fb89-7b4c-b24e-3ee433c379c2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireShortTermInvestments_019fec0a-fb89-7c41-9f5b-2c100b2bad00" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsToAcquireShortTermInvestments"/>
    <link:calculationArc order="9" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_019fec0a-fb89-76fc-82ee-83530ae41fbd" xlink:to="loc_us-gaap_PaymentsToAcquireShortTermInvestments_019fec0a-fb89-7c41-9f5b-2c100b2bad00" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_019fec0a-fb89-7749-8b7e-74c6c6ac51f5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfCommonStock_019fec0a-fb89-719c-866f-10e94c96376a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromIssuanceOfCommonStock"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_019fec0a-fb89-7749-8b7e-74c6c6ac51f5" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfCommonStock_019fec0a-fb89-719c-866f-10e94c96376a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_hg_ProceedsFromPaymentsForFromContributionsToAdditionalPaidInCapital_019fec0a-fb89-7ad4-ba1f-f23578774fb0" xlink:href="hg-20260930.xsd#hg_ProceedsFromPaymentsForFromContributionsToAdditionalPaidInCapital"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_019fec0a-fb89-7749-8b7e-74c6c6ac51f5" xlink:to="loc_hg_ProceedsFromPaymentsForFromContributionsToAdditionalPaidInCapital_019fec0a-fb89-7ad4-ba1f-f23578774fb0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfFinancingCosts_019fec0a-fb89-727c-8979-7368cd1cb124" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsOfFinancingCosts"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_019fec0a-fb89-7749-8b7e-74c6c6ac51f5" xlink:to="loc_us-gaap_PaymentsOfFinancingCosts_019fec0a-fb89-727c-8979-7368cd1cb124" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfDividendsCommonStock_019fec0a-fb89-7db2-b379-fb7696d1b9f3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsOfDividendsCommonStock"/>
    <link:calculationArc order="4" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_019fec0a-fb89-7749-8b7e-74c6c6ac51f5" xlink:to="loc_us-gaap_PaymentsOfDividendsCommonStock_019fec0a-fb89-7db2-b379-fb7696d1b9f3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToMinorityShareholders_019fec0a-fb89-7c94-a28a-65fa0f7e4f48" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsToMinorityShareholders"/>
    <link:calculationArc order="5" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_019fec0a-fb89-7749-8b7e-74c6c6ac51f5" xlink:to="loc_us-gaap_PaymentsToMinorityShareholders_019fec0a-fb89-7c94-a28a-65fa0f7e4f48" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_019fec0a-fb89-77f2-9830-50740dcc16f9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsForRepurchaseOfCommonStock"/>
    <link:calculationArc order="6" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_019fec0a-fb89-7749-8b7e-74c6c6ac51f5" xlink:to="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_019fec0a-fb89-77f2-9830-50740dcc16f9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_019fec0a-fb89-7478-86c5-244b25588be0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fec0a-fb89-78e1-a0ac-fa21de429299" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_019fec0a-fb89-7478-86c5-244b25588be0" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fec0a-fb89-78e1-a0ac-fa21de429299" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_019fec0a-fb89-7b59-b332-1a810b0b5db6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_019fec0a-fb89-7478-86c5-244b25588be0" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_019fec0a-fb89-7b59-b332-1a810b0b5db6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_019fec0a-fb89-72f3-bb16-d74cb6a2052f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_019fec0a-fb89-7478-86c5-244b25588be0" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_019fec0a-fb89-72f3-bb16-d74cb6a2052f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_019fec0a-fb89-7e71-ba89-e5ed7d503b4d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_019fec0a-fb89-7478-86c5-244b25588be0" xlink:to="loc_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_019fec0a-fb89-7e71-ba89-e5ed7d503b4d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fec0a-fb89-787d-8b30-c84e55d760e7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInReinsurancePayables_019fec0a-fb89-7656-9bbe-042003dd88f7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInReinsurancePayables"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fec0a-fb89-787d-8b30-c84e55d760e7" xlink:to="loc_us-gaap_IncreaseDecreaseInReinsurancePayables_019fec0a-fb89-7656-9bbe-042003dd88f7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInDeferredPolicyAcquisitionCosts_019fec0a-fb89-79be-b354-dc56d4b699a8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInDeferredPolicyAcquisitionCosts"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fec0a-fb89-787d-8b30-c84e55d760e7" xlink:to="loc_us-gaap_IncreaseDecreaseInDeferredPolicyAcquisitionCosts_019fec0a-fb89-79be-b354-dc56d4b699a8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherOperatingAssets_019fec0a-fb89-79c1-a661-deac5aa31ed8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInOtherOperatingAssets"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fec0a-fb89-787d-8b30-c84e55d760e7" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherOperatingAssets_019fec0a-fb89-79c1-a661-deac5aa31ed8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensation_019fec0a-fb89-7d96-8124-8e79e60f81c3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensation"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fec0a-fb89-787d-8b30-c84e55d760e7" xlink:to="loc_us-gaap_ShareBasedCompensation_019fec0a-fb89-7d96-8124-8e79e60f81c3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_019fec0a-fb89-7eee-be56-9677f80c159f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fec0a-fb89-787d-8b30-c84e55d760e7" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_019fec0a-fb89-7eee-be56-9677f80c159f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationAmortizationAndAccretionNet_019fec0a-fb89-7a18-8c7c-a4470bb9928d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DepreciationAmortizationAndAccretionNet"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fec0a-fb89-787d-8b30-c84e55d760e7" xlink:to="loc_us-gaap_DepreciationAmortizationAndAccretionNet_019fec0a-fb89-7a18-8c7c-a4470bb9928d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInUnearnedPremiums_019fec0a-fb89-757c-a9c4-eb4010a256c4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInUnearnedPremiums"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fec0a-fb89-787d-8b30-c84e55d760e7" xlink:to="loc_us-gaap_IncreaseDecreaseInUnearnedPremiums_019fec0a-fb89-757c-a9c4-eb4010a256c4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInPrepaidReinsurancePremiums_019fec0a-fb89-7b32-9d88-2e31e03f0ee6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInPrepaidReinsurancePremiums"/>
    <link:calculationArc order="8" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fec0a-fb89-787d-8b30-c84e55d760e7" xlink:to="loc_us-gaap_IncreaseDecreaseInPrepaidReinsurancePremiums_019fec0a-fb89-7b32-9d88-2e31e03f0ee6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealizedInvestmentGainsLosses_019fec0a-fb89-7517-959f-2508bba434b7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RealizedInvestmentGainsLosses"/>
    <link:calculationArc order="9" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fec0a-fb89-787d-8b30-c84e55d760e7" xlink:to="loc_us-gaap_RealizedInvestmentGainsLosses_019fec0a-fb89-7517-959f-2508bba434b7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_hg_IncreaseDecreaseInReinsuranceRecoverableUnpaidLossesAndLossAdjustmentExpenses_019fec0a-fb89-78b1-996d-bde667415299" xlink:href="hg-20260930.xsd#hg_IncreaseDecreaseInReinsuranceRecoverableUnpaidLossesAndLossAdjustmentExpenses"/>
    <link:calculationArc order="10" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fec0a-fb89-787d-8b30-c84e55d760e7" xlink:to="loc_hg_IncreaseDecreaseInReinsuranceRecoverableUnpaidLossesAndLossAdjustmentExpenses_019fec0a-fb89-78b1-996d-bde667415299" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_hg_IncreaseDecreaseInReinsuranceRecoverablePaidClaimsAndClaimsAdjustments_019fec0a-fb89-7851-a8fb-8add68b275eb" xlink:href="hg-20260930.xsd#hg_IncreaseDecreaseInReinsuranceRecoverablePaidClaimsAndClaimsAdjustments"/>
    <link:calculationArc order="11" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fec0a-fb89-787d-8b30-c84e55d760e7" xlink:to="loc_hg_IncreaseDecreaseInReinsuranceRecoverablePaidClaimsAndClaimsAdjustments_019fec0a-fb89-7851-a8fb-8add68b275eb" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInLiabilityForClaimsAndClaimsAdjustmentExpenseReserve_019fec0a-fb89-7e84-b383-62ce0aaa26e4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInLiabilityForClaimsAndClaimsAdjustmentExpenseReserve"/>
    <link:calculationArc order="12" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fec0a-fb89-787d-8b30-c84e55d760e7" xlink:to="loc_us-gaap_IncreaseDecreaseInLiabilityForClaimsAndClaimsAdjustmentExpenseReserve_019fec0a-fb89-7e84-b383-62ce0aaa26e4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrealizedGainLossOnInvestments_019fec0a-fb89-7bfe-a482-fa86872014b0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_UnrealizedGainLossOnInvestments"/>
    <link:calculationArc order="13" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fec0a-fb89-787d-8b30-c84e55d760e7" xlink:to="loc_us-gaap_UnrealizedGainLossOnInvestments_019fec0a-fb89-7bfe-a482-fa86872014b0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_019fec0a-fb89-7806-8ced-16868bec25f1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProfitLoss"/>
    <link:calculationArc order="14" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fec0a-fb89-787d-8b30-c84e55d760e7" xlink:to="loc_us-gaap_ProfitLoss_019fec0a-fb89-7806-8ced-16868bec25f1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInPremiumsReceivable_019fec0a-fb89-79ab-8c56-a825858a0598" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInPremiumsReceivable"/>
    <link:calculationArc order="15" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fec0a-fb89-787d-8b30-c84e55d760e7" xlink:to="loc_us-gaap_IncreaseDecreaseInPremiumsReceivable_019fec0a-fb89-79ab-8c56-a825858a0598" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNoncashIncomeExpense_019fec0a-fb89-7639-b6e4-be429ddb8972" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherNoncashIncomeExpense"/>
    <link:calculationArc order="16" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fec0a-fb89-787d-8b30-c84e55d760e7" xlink:to="loc_us-gaap_OtherNoncashIncomeExpense_019fec0a-fb89-7639-b6e4-be429ddb8972" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.hamiltongroup.com/role/InvestmentsScheduleofFixedMaturityandShortTermInvestmentsDetails" xlink:type="simple" xlink:href="hg-20260930.xsd#InvestmentsScheduleofFixedMaturityandShortTermInvestmentsDetails"/>
  <link:calculationLink xlink:role="http://www.hamiltongroup.com/role/InvestmentsScheduleofFixedMaturityandShortTermInvestmentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradingSecuritiesDebtAmortizedCost_019fec0a-fb89-79bd-a1a4-b06d13bc5454" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TradingSecuritiesDebtAmortizedCost"/>
    <link:loc xlink:type="locator" xlink:label="loc_hg_DebtSecuritiesTradingAccumulatedGrossUnrealizedGainBeforeTax_019fec0a-fb89-76ec-b6d6-e6c096f42ee2" xlink:href="hg-20260930.xsd#hg_DebtSecuritiesTradingAccumulatedGrossUnrealizedGainBeforeTax"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_TradingSecuritiesDebtAmortizedCost_019fec0a-fb89-79bd-a1a4-b06d13bc5454" xlink:to="loc_hg_DebtSecuritiesTradingAccumulatedGrossUnrealizedGainBeforeTax_019fec0a-fb89-76ec-b6d6-e6c096f42ee2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_hg_DebtSecuritiesTradingAccumulatedGrossUnrealizedLossBeforeTax_019fec0a-fb89-7875-9b56-b1e7ac360b4f" xlink:href="hg-20260930.xsd#hg_DebtSecuritiesTradingAccumulatedGrossUnrealizedLossBeforeTax"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_TradingSecuritiesDebtAmortizedCost_019fec0a-fb89-79bd-a1a4-b06d13bc5454" xlink:to="loc_hg_DebtSecuritiesTradingAccumulatedGrossUnrealizedLossBeforeTax_019fec0a-fb89-7875-9b56-b1e7ac360b4f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradingSecuritiesDebt_019fec0a-fb89-751d-be8c-a7881fffe766" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TradingSecuritiesDebt"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_TradingSecuritiesDebtAmortizedCost_019fec0a-fb89-79bd-a1a4-b06d13bc5454" xlink:to="loc_us-gaap_TradingSecuritiesDebt_019fec0a-fb89-751d-be8c-a7881fffe766" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.hamiltongroup.com/role/InvestmentsScheduleofContractualMaturitiesofFixedMaturitySecuritiesDetails" xlink:type="simple" xlink:href="hg-20260930.xsd#InvestmentsScheduleofContractualMaturitiesofFixedMaturitySecuritiesDetails"/>
  <link:calculationLink xlink:role="http://www.hamiltongroup.com/role/InvestmentsScheduleofContractualMaturitiesofFixedMaturitySecuritiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradingSecuritiesDebt_019fec0a-fb89-7630-8198-59cb54df0886" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TradingSecuritiesDebt"/>
    <link:loc xlink:type="locator" xlink:label="loc_hg_DebtSecuritiesTradingFairValueMaturityAllocatedAndSingleMaturityDateAfterYear10_019fec0a-fb89-7c97-ac2b-b28c5b351289" xlink:href="hg-20260930.xsd#hg_DebtSecuritiesTradingFairValueMaturityAllocatedAndSingleMaturityDateAfterYear10"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_TradingSecuritiesDebt_019fec0a-fb89-7630-8198-59cb54df0886" xlink:to="loc_hg_DebtSecuritiesTradingFairValueMaturityAllocatedAndSingleMaturityDateAfterYear10_019fec0a-fb89-7c97-ac2b-b28c5b351289" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_hg_DebtSecuritiesTradingMaturityWithoutSingleMaturityDateFairValue_019fec0a-fb89-7d56-a242-eb8ef9ba79dd" xlink:href="hg-20260930.xsd#hg_DebtSecuritiesTradingMaturityWithoutSingleMaturityDateFairValue"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_TradingSecuritiesDebt_019fec0a-fb89-7630-8198-59cb54df0886" xlink:to="loc_hg_DebtSecuritiesTradingMaturityWithoutSingleMaturityDateFairValue_019fec0a-fb89-7d56-a242-eb8ef9ba79dd" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_hg_DebtSecuritiesTradingFairValueMaturityAllocatedAndSingleMaturityDateAfterYearOneThroughFive_019fec0a-fb89-7fdd-af2e-416e43b93eb9" xlink:href="hg-20260930.xsd#hg_DebtSecuritiesTradingFairValueMaturityAllocatedAndSingleMaturityDateAfterYearOneThroughFive"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_TradingSecuritiesDebt_019fec0a-fb89-7630-8198-59cb54df0886" xlink:to="loc_hg_DebtSecuritiesTradingFairValueMaturityAllocatedAndSingleMaturityDateAfterYearOneThroughFive_019fec0a-fb89-7fdd-af2e-416e43b93eb9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_hg_DebtSecuritiesTradingFairValueMaturityAllocatedAndSingleMaturityDateAfterYear5Through10_019fec0a-fb89-7a3d-a12e-36ecdc31cf5b" xlink:href="hg-20260930.xsd#hg_DebtSecuritiesTradingFairValueMaturityAllocatedAndSingleMaturityDateAfterYear5Through10"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_TradingSecuritiesDebt_019fec0a-fb89-7630-8198-59cb54df0886" xlink:to="loc_hg_DebtSecuritiesTradingFairValueMaturityAllocatedAndSingleMaturityDateAfterYear5Through10_019fec0a-fb89-7a3d-a12e-36ecdc31cf5b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_hg_DebtSecuritiesTradingFairValueMaturityAllocatedAndSingleMaturityDateYearOne_019fec0a-fb89-7d08-b24f-251f436ad303" xlink:href="hg-20260930.xsd#hg_DebtSecuritiesTradingFairValueMaturityAllocatedAndSingleMaturityDateYearOne"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_TradingSecuritiesDebt_019fec0a-fb89-7630-8198-59cb54df0886" xlink:to="loc_hg_DebtSecuritiesTradingFairValueMaturityAllocatedAndSingleMaturityDateYearOne_019fec0a-fb89-7d08-b24f-251f436ad303" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradingSecuritiesDebtAmortizedCost_019fec0a-fb89-7eec-973a-94ce6bc01700" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TradingSecuritiesDebtAmortizedCost"/>
    <link:loc xlink:type="locator" xlink:label="loc_hg_DebtSecuritiesTradingAmortizedCostMaturityAllocatedAndSingleMaturityDateAfterYearOneThroughFive_019fec0a-fb89-7178-825f-5de8730a41e0" xlink:href="hg-20260930.xsd#hg_DebtSecuritiesTradingAmortizedCostMaturityAllocatedAndSingleMaturityDateAfterYearOneThroughFive"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_TradingSecuritiesDebtAmortizedCost_019fec0a-fb89-7eec-973a-94ce6bc01700" xlink:to="loc_hg_DebtSecuritiesTradingAmortizedCostMaturityAllocatedAndSingleMaturityDateAfterYearOneThroughFive_019fec0a-fb89-7178-825f-5de8730a41e0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_hg_DebtSecuritiesTradingAmortizedCostMaturityAllocatedAndSingleMaturityDateAfterYear10_019fec0a-fb89-78a8-b1be-1041d9642410" xlink:href="hg-20260930.xsd#hg_DebtSecuritiesTradingAmortizedCostMaturityAllocatedAndSingleMaturityDateAfterYear10"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_TradingSecuritiesDebtAmortizedCost_019fec0a-fb89-7eec-973a-94ce6bc01700" xlink:to="loc_hg_DebtSecuritiesTradingAmortizedCostMaturityAllocatedAndSingleMaturityDateAfterYear10_019fec0a-fb89-78a8-b1be-1041d9642410" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_hg_DebtSecuritiesTradingMaturityWithoutSingleMaturityDateAmortizedCost_019fec0a-fb89-7920-b04c-918a0c0393da" xlink:href="hg-20260930.xsd#hg_DebtSecuritiesTradingMaturityWithoutSingleMaturityDateAmortizedCost"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_TradingSecuritiesDebtAmortizedCost_019fec0a-fb89-7eec-973a-94ce6bc01700" xlink:to="loc_hg_DebtSecuritiesTradingMaturityWithoutSingleMaturityDateAmortizedCost_019fec0a-fb89-7920-b04c-918a0c0393da" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_hg_DebtSecuritiesTradingAmortizedCostMaturityAllocatedAndSingleMaturityDateYearOne_019fec0a-fb89-7f70-9ef2-f02654549fa1" xlink:href="hg-20260930.xsd#hg_DebtSecuritiesTradingAmortizedCostMaturityAllocatedAndSingleMaturityDateYearOne"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_TradingSecuritiesDebtAmortizedCost_019fec0a-fb89-7eec-973a-94ce6bc01700" xlink:to="loc_hg_DebtSecuritiesTradingAmortizedCostMaturityAllocatedAndSingleMaturityDateYearOne_019fec0a-fb89-7f70-9ef2-f02654549fa1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_hg_DebtSecuritiesTradingAmortizedCostMaturityAllocatedAndSingleMaturityDateAfterYear5Through10_019fec0a-fb89-7953-b68d-bcfe07f9e65a" xlink:href="hg-20260930.xsd#hg_DebtSecuritiesTradingAmortizedCostMaturityAllocatedAndSingleMaturityDateAfterYear5Through10"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_TradingSecuritiesDebtAmortizedCost_019fec0a-fb89-7eec-973a-94ce6bc01700" xlink:to="loc_hg_DebtSecuritiesTradingAmortizedCostMaturityAllocatedAndSingleMaturityDateAfterYear5Through10_019fec0a-fb89-7953-b68d-bcfe07f9e65a" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.hamiltongroup.com/role/InvestmentsScheduleofInvestmentsinTwoSigmaFundsDetails" xlink:type="simple" xlink:href="hg-20260930.xsd#InvestmentsScheduleofInvestmentsinTwoSigmaFundsDetails"/>
  <link:calculationLink xlink:role="http://www.hamiltongroup.com/role/InvestmentsScheduleofInvestmentsinTwoSigmaFundsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentOwnedAtCost_019fec0a-fb89-767e-844a-b904bb39558c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentOwnedAtCost"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AlternativeInvestment_019fec0a-fb89-786c-9d4c-5fe03d531721" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AlternativeInvestment"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_InvestmentOwnedAtCost_019fec0a-fb89-767e-844a-b904bb39558c" xlink:to="loc_us-gaap_AlternativeInvestment_019fec0a-fb89-786c-9d4c-5fe03d531721" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_hg_InvestmentOwnedAccumulatedGrossUnrealizedGainLossBeforeTax_019fec0a-fb89-7af6-b2f3-606454c0c69f" xlink:href="hg-20260930.xsd#hg_InvestmentOwnedAccumulatedGrossUnrealizedGainLossBeforeTax"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_InvestmentOwnedAtCost_019fec0a-fb89-767e-844a-b904bb39558c" xlink:to="loc_hg_InvestmentOwnedAccumulatedGrossUnrealizedGainLossBeforeTax_019fec0a-fb89-7af6-b2f3-606454c0c69f" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.hamiltongroup.com/role/InvestmentsScheduleofRealizedandUnrealizedGainsLossesonInvestmentsandNetInvestmentIncomeLossDetails" xlink:type="simple" xlink:href="hg-20260930.xsd#InvestmentsScheduleofRealizedandUnrealizedGainsLossesonInvestmentsandNetInvestmentIncomeLossDetails"/>
  <link:calculationLink xlink:role="http://www.hamiltongroup.com/role/InvestmentsScheduleofRealizedandUnrealizedGainsLossesonInvestmentsandNetInvestmentIncomeLossDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentIncomeNet_019fec0a-fb89-7082-9fbc-e8ead42480d2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentIncomeNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ManagementFeeExpense_019fec0a-fb89-79cc-9741-cccdf9d0a519" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ManagementFeeExpense"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_InvestmentIncomeNet_019fec0a-fb89-7082-9fbc-e8ead42480d2" xlink:to="loc_us-gaap_ManagementFeeExpense_019fec0a-fb89-79cc-9741-cccdf9d0a519" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentIncomeInvestmentExpense_019fec0a-fb89-7fd6-828f-0abc2e4bf2a2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentIncomeInvestmentExpense"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_InvestmentIncomeNet_019fec0a-fb89-7082-9fbc-e8ead42480d2" xlink:to="loc_us-gaap_InvestmentIncomeInvestmentExpense_019fec0a-fb89-7fd6-828f-0abc2e4bf2a2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentIncomeInterestAndDividend_019fec0a-fb89-7f10-b84e-fd82501572fa" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentIncomeInterestAndDividend"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_InvestmentIncomeNet_019fec0a-fb89-7082-9fbc-e8ead42480d2" xlink:to="loc_us-gaap_InvestmentIncomeInterestAndDividend_019fec0a-fb89-7f10-b84e-fd82501572fa" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnInvestments_019fec0a-fb89-7737-96d2-91e57bbcec05" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GainLossOnInvestments"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrealizedGainLossOnInvestments_019fec0a-fb89-7c42-a336-7268553b52c9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_UnrealizedGainLossOnInvestments"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_GainLossOnInvestments_019fec0a-fb89-7737-96d2-91e57bbcec05" xlink:to="loc_us-gaap_UnrealizedGainLossOnInvestments_019fec0a-fb89-7c42-a336-7268553b52c9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealizedInvestmentGainsLosses_019fec0a-fb89-73dc-a9ee-f6793f01c9b1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RealizedInvestmentGainsLosses"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_GainLossOnInvestments_019fec0a-fb89-7737-96d2-91e57bbcec05" xlink:to="loc_us-gaap_RealizedInvestmentGainsLosses_019fec0a-fb89-73dc-a9ee-f6793f01c9b1" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.hamiltongroup.com/role/FairValueDetails" xlink:type="simple" xlink:href="hg-20260930.xsd#FairValueDetails"/>
  <link:calculationLink xlink:role="http://www.hamiltongroup.com/role/FairValueDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsFairValueDisclosure_019fec0a-fb89-7cc4-a6a2-ef63c7896d9a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetsFairValueDisclosure"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradingSecuritiesDebt_019fec0a-fb89-78a9-8671-46eacdf861c0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TradingSecuritiesDebt"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsFairValueDisclosure_019fec0a-fb89-7cc4-a6a2-ef63c7896d9a" xlink:to="loc_us-gaap_TradingSecuritiesDebt_019fec0a-fb89-78a9-8671-46eacdf861c0" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.hamiltongroup.com/role/VariableInterestEntitiesScheduleofTotalAssetsandTotalLiabilitiesofTSHamiltonFundDetails" xlink:type="simple" xlink:href="hg-20260930.xsd#VariableInterestEntitiesScheduleofTotalAssetsandTotalLiabilitiesofTSHamiltonFundDetails"/>
  <link:calculationLink xlink:role="http://www.hamiltongroup.com/role/VariableInterestEntitiesScheduleofTotalAssetsandTotalLiabilitiesofTSHamiltonFundDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_hg_VariableInterestEntityNetAssetsLiabilities_019fec0a-fb89-7ddb-af5c-e03a419303c5" xlink:href="hg-20260930.xsd#hg_VariableInterestEntityNetAssetsLiabilities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_019fec0a-fb89-7994-bfa5-82106ac2c620" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Assets"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_hg_VariableInterestEntityNetAssetsLiabilities_019fec0a-fb89-7ddb-af5c-e03a419303c5" xlink:to="loc_us-gaap_Assets_019fec0a-fb89-7994-bfa5-82106ac2c620" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_019fec0a-fb89-78b7-87bb-31d6ae93c734" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Liabilities"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_hg_VariableInterestEntityNetAssetsLiabilities_019fec0a-fb89-7ddb-af5c-e03a419303c5" xlink:to="loc_us-gaap_Liabilities_019fec0a-fb89-78b7-87bb-31d6ae93c734" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_019fec0a-fb89-7710-b85a-deb5ba719b29" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Assets"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_019fec0a-fb89-7b89-aa86-94c76bd7a17b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_019fec0a-fb89-7710-b85a-deb5ba719b29" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_019fec0a-fb89-7b89-aa86-94c76bd7a17b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradingSecuritiesDebt_019fec0a-fb89-72b4-936b-e828c187dddd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TradingSecuritiesDebt"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_019fec0a-fb89-7710-b85a-deb5ba719b29" xlink:to="loc_us-gaap_TradingSecuritiesDebt_019fec0a-fb89-72b4-936b-e828c187dddd" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReceivablesFromBrokersDealersAndClearingOrganizations_019fec0a-fb89-7518-83ff-2cd702609278" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ReceivablesFromBrokersDealersAndClearingOrganizations"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_019fec0a-fb89-7710-b85a-deb5ba719b29" xlink:to="loc_us-gaap_ReceivablesFromBrokersDealersAndClearingOrganizations_019fec0a-fb89-7518-83ff-2cd702609278" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendAndInterestReceivable_019fec0a-fb89-74a4-a315-b6719e2454ea" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DividendAndInterestReceivable"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_019fec0a-fb89-7710-b85a-deb5ba719b29" xlink:to="loc_us-gaap_DividendAndInterestReceivable_019fec0a-fb89-74a4-a315-b6719e2454ea" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AlternativeInvestment_019fec0a-fb89-7755-a9b4-5d3d132de1e6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AlternativeInvestment"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_019fec0a-fb89-7710-b85a-deb5ba719b29" xlink:to="loc_us-gaap_AlternativeInvestment_019fec0a-fb89-7755-a9b4-5d3d132de1e6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_019fec0a-fb89-7bcf-aa14-122a7ed63746" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Liabilities"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_PayablesToBrokerDealersAndClearingOrganizations_019fec0a-fb89-7e29-9b40-98453a7b444f" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_PayablesToBrokerDealersAndClearingOrganizations"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_019fec0a-fb89-7bcf-aa14-122a7ed63746" xlink:to="loc_srt_PayablesToBrokerDealersAndClearingOrganizations_019fec0a-fb89-7e29-9b40-98453a7b444f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_hg_WithdrawalPayable_019fec0a-fb89-7d51-8dc9-808bbe8834af" xlink:href="hg-20260930.xsd#hg_WithdrawalPayable"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_019fec0a-fb89-7bcf-aa14-122a7ed63746" xlink:to="loc_hg_WithdrawalPayable_019fec0a-fb89-7d51-8dc9-808bbe8834af" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent_019fec0a-fb89-7f75-acd0-9902a5cd353e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_019fec0a-fb89-7bcf-aa14-122a7ed63746" xlink:to="loc_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent_019fec0a-fb89-7f75-acd0-9902a5cd353e" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.hamiltongroup.com/role/ReserveforLossesandLossAdjustmentExpensesScheduleofReconciliationofUnpaidLossesandLossAdjustmentExpensesDetails" xlink:type="simple" xlink:href="hg-20260930.xsd#ReserveforLossesandLossAdjustmentExpensesScheduleofReconciliationofUnpaidLossesandLossAdjustmentExpensesDetails"/>
  <link:calculationLink xlink:role="http://www.hamiltongroup.com/role/ReserveforLossesandLossAdjustmentExpensesScheduleofReconciliationofUnpaidLossesandLossAdjustmentExpensesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForLossesAndLossAdjustmentExpense_019fec0a-fb8a-7a1d-bbef-e3eb359ab132" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsForLossesAndLossAdjustmentExpense"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1_019fec0a-fb8a-7854-b573-7dc9a7cee80c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_PaymentsForLossesAndLossAdjustmentExpense_019fec0a-fb8a-7a1d-bbef-e3eb359ab132" xlink:to="loc_us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1_019fec0a-fb8a-7854-b573-7dc9a7cee80c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1_019fec0a-fb8a-75a8-803f-8a576952dc06" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_PaymentsForLossesAndLossAdjustmentExpense_019fec0a-fb8a-7a1d-bbef-e3eb359ab132" xlink:to="loc_us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1_019fec0a-fb8a-75a8-803f-8a576952dc06" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1_019fec0a-fb8a-7f38-a038-cf754a2f79ca" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense_019fec0a-fb8a-75c5-ae1b-064eecb805f9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1_019fec0a-fb8a-7f38-a038-cf754a2f79ca" xlink:to="loc_us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense_019fec0a-fb8a-75c5-ae1b-064eecb805f9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense_019fec0a-fb8a-7779-8ccb-811933ebca06" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1_019fec0a-fb8a-7f38-a038-cf754a2f79ca" xlink:to="loc_us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense_019fec0a-fb8a-7779-8ccb-811933ebca06" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.hamiltongroup.com/role/SegmentReportingScheduleofSegmentReportingInformationDetails" xlink:type="simple" xlink:href="hg-20260930.xsd#SegmentReportingScheduleofSegmentReportingInformationDetails"/>
  <link:calculationLink xlink:role="http://www.hamiltongroup.com/role/SegmentReportingScheduleofSegmentReportingInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_hg_UnderwritingIncomeLossNet_019fec0a-fb8a-7ae9-9f92-e324e30c2b80" xlink:href="hg-20260930.xsd#hg_UnderwritingIncomeLossNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherUnderwritingExpense_019fec0a-fb8a-7ae5-9d8e-fe4b44f85284" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherUnderwritingExpense"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_hg_UnderwritingIncomeLossNet_019fec0a-fb8a-7ae9-9f92-e324e30c2b80" xlink:to="loc_us-gaap_OtherUnderwritingExpense_019fec0a-fb8a-7ae5-9d8e-fe4b44f85284" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PremiumsEarnedNet_019fec0a-fb8a-74a6-b00d-28d6ee75317b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PremiumsEarnedNet"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_hg_UnderwritingIncomeLossNet_019fec0a-fb8a-7ae9-9f92-e324e30c2b80" xlink:to="loc_us-gaap_PremiumsEarnedNet_019fec0a-fb8a-74a6-b00d-28d6ee75317b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense_019fec0a-fb8a-70d5-bd79-c39e53995ea4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_hg_UnderwritingIncomeLossNet_019fec0a-fb8a-7ae9-9f92-e324e30c2b80" xlink:to="loc_us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense_019fec0a-fb8a-70d5-bd79-c39e53995ea4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1_019fec0a-fb8a-7ccb-b556-7941955f236d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1"/>
    <link:calculationArc order="4" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_hg_UnderwritingIncomeLossNet_019fec0a-fb8a-7ae9-9f92-e324e30c2b80" xlink:to="loc_us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1_019fec0a-fb8a-7ccb-b556-7941955f236d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InsuranceAgencyManagementFee_019fec0a-fb8a-7b75-9631-1553ea68f386" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InsuranceAgencyManagementFee"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_hg_UnderwritingIncomeLossNet_019fec0a-fb8a-7ae9-9f92-e324e30c2b80" xlink:to="loc_us-gaap_InsuranceAgencyManagementFee_019fec0a-fb8a-7b75-9631-1553ea68f386" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019fec0a-fb8a-798b-9558-ec199a88121c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentIncomeNet_019fec0a-fb8a-78f3-8fc0-ff018f180c42" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentIncomeNet"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019fec0a-fb8a-798b-9558-ec199a88121c" xlink:to="loc_us-gaap_InvestmentIncomeNet_019fec0a-fb8a-78f3-8fc0-ff018f180c42" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_019fec0a-fb8a-76f9-9122-286552f235f9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AmortizationOfIntangibleAssets"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019fec0a-fb8a-798b-9558-ec199a88121c" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_019fec0a-fb8a-76f9-9122-286552f235f9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnInvestments_019fec0a-fb8a-7c80-8e09-5af1a1083842" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GainLossOnInvestments"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019fec0a-fb8a-798b-9558-ec199a88121c" xlink:to="loc_us-gaap_GainLossOnInvestments_019fec0a-fb8a-7c80-8e09-5af1a1083842" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpense_019fec0a-fb8a-7572-a2c0-e81eb66233f3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestExpense"/>
    <link:calculationArc order="4" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019fec0a-fb8a-798b-9558-ec199a88121c" xlink:to="loc_us-gaap_InterestExpense_019fec0a-fb8a-7572-a2c0-e81eb66233f3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_hg_UnderwritingIncomeLossNet_019fec0a-fb8a-7e8e-85b1-93697d22ff2c" xlink:href="hg-20260930.xsd#hg_UnderwritingIncomeLossNet"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019fec0a-fb8a-798b-9558-ec199a88121c" xlink:to="loc_hg_UnderwritingIncomeLossNet_019fec0a-fb8a-7e8e-85b1-93697d22ff2c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeneralAndAdministrativeExpense_019fec0a-fb8a-7bcf-9203-3628b1baa9be" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GeneralAndAdministrativeExpense"/>
    <link:calculationArc order="6" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019fec0a-fb8a-798b-9558-ec199a88121c" xlink:to="loc_us-gaap_GeneralAndAdministrativeExpense_019fec0a-fb8a-7bcf-9203-3628b1baa9be" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignCurrencyTransactionGainLossBeforeTax_019fec0a-fb8a-7918-8775-ee6fdd888479" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ForeignCurrencyTransactionGainLossBeforeTax"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019fec0a-fb8a-798b-9558-ec199a88121c" xlink:to="loc_us-gaap_ForeignCurrencyTransactionGainLossBeforeTax_019fec0a-fb8a-7918-8775-ee6fdd888479" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossRatio_019fec0a-fb8a-7db0-a945-6661f0b5d29e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LossRatio"/>
    <link:loc xlink:type="locator" xlink:label="loc_hg_AttritionalLossRatioCurrentYear_019fec0a-fb8a-7737-82c4-ad494f9cb704" xlink:href="hg-20260930.xsd#hg_AttritionalLossRatioCurrentYear"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_LossRatio_019fec0a-fb8a-7db0-a945-6661f0b5d29e" xlink:to="loc_hg_AttritionalLossRatioCurrentYear_019fec0a-fb8a-7737-82c4-ad494f9cb704" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_hg_AttritionalLossRatioPriorYearDevelopment_019fec0a-fb8a-7ee1-a282-eefef796dc99" xlink:href="hg-20260930.xsd#hg_AttritionalLossRatioPriorYearDevelopment"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_LossRatio_019fec0a-fb8a-7db0-a945-6661f0b5d29e" xlink:to="loc_hg_AttritionalLossRatioPriorYearDevelopment_019fec0a-fb8a-7ee1-a282-eefef796dc99" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_hg_CatastropheLossRatioPriorYearDevelopment_019fec0a-fb8a-799d-8bb2-9fccfcc0ba12" xlink:href="hg-20260930.xsd#hg_CatastropheLossRatioPriorYearDevelopment"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_LossRatio_019fec0a-fb8a-7db0-a945-6661f0b5d29e" xlink:to="loc_hg_CatastropheLossRatioPriorYearDevelopment_019fec0a-fb8a-799d-8bb2-9fccfcc0ba12" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_hg_CatastropheLossRatioCurrentYear_019fec0a-fb8a-78ff-8654-8a021176c812" xlink:href="hg-20260930.xsd#hg_CatastropheLossRatioCurrentYear"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_LossRatio_019fec0a-fb8a-7db0-a945-6661f0b5d29e" xlink:to="loc_hg_CatastropheLossRatioCurrentYear_019fec0a-fb8a-78ff-8654-8a021176c812" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.hamiltongroup.com/role/EarningsPerShareDetails" xlink:type="simple" xlink:href="hg-20260930.xsd#EarningsPerShareDetails"/>
  <link:calculationLink xlink:role="http://www.hamiltongroup.com/role/EarningsPerShareDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_019fec0a-fddc-7fb6-94e2-10d8515e000d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_019fec0a-fddc-7aba-9cf0-954a81d584d2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_019fec0a-fddc-7fb6-94e2-10d8515e000d" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_019fec0a-fddc-7aba-9cf0-954a81d584d2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_019fec0a-fddc-723e-9c35-d69bfdef6524" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_019fec0a-fddc-7fb6-94e2-10d8515e000d" xlink:to="loc_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_019fec0a-fddc-723e-9c35-d69bfdef6524" xlink:type="arc"/>
  </link:calculationLink>
</link:linkbase>
