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

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2023 Workiva-->
<!--r:5cb8ff8a-ed58-4b5c-b8ff-c77a2229ab62,g:17d364b7-1fd4-44c1-a87d-98f3b18d5a50-->
<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.intlfcstone.com/role/CondensedConsolidatedBalanceSheets" xlink:type="simple" xlink:href="intl-20230630.xsd#CondensedConsolidatedBalanceSheets"/>
  <link:calculationLink xlink:role="http://www.intlfcstone.com/role/CondensedConsolidatedBalanceSheets" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_0401b004-893c-405d-b909-a6b43c29ad1f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_Liabilities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableAndOtherAccruedLiabilities_fb46adfa-fe9c-4648-b976-a228d0080240" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccountsPayableAndOtherAccruedLiabilities"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_0401b004-893c-405d-b909-a6b43c29ad1f" xlink:to="loc_us-gaap_AccountsPayableAndOtherAccruedLiabilities_fb46adfa-fe9c-4648-b976-a228d0080240" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiability_b7c9a705-c7e8-45ce-b21e-daecec9c55d4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OperatingLeaseLiability"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_0401b004-893c-405d-b909-a6b43c29ad1f" xlink:to="loc_us-gaap_OperatingLeaseLiability_b7c9a705-c7e8-45ce-b21e-daecec9c55d4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_PayablesToCustomers_055ca70b-dfac-499e-a9d8-0993575101d9" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_PayablesToCustomers"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_0401b004-893c-405d-b909-a6b43c29ad1f" xlink:to="loc_srt_PayablesToCustomers_055ca70b-dfac-499e-a9d8-0993575101d9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_PayablesToBrokerDealersAndClearingOrganizations_49346cb1-d489-4327-bf52-a34b01a1be79" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_PayablesToBrokerDealersAndClearingOrganizations"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_0401b004-893c-405d-b909-a6b43c29ad1f" xlink:to="loc_srt_PayablesToBrokerDealersAndClearingOrganizations_49346cb1-d489-4327-bf52-a34b01a1be79" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCredit_c323123b-4f9d-4af8-ac40-00574af6a1d4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LineOfCredit"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_0401b004-893c-405d-b909-a6b43c29ad1f" xlink:to="loc_us-gaap_LineOfCredit_c323123b-4f9d-4af8-ac40-00574af6a1d4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansPayable_ba4bcbdf-7e81-41e7-81fc-059c9ef31eaa" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LoansPayable"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_0401b004-893c-405d-b909-a6b43c29ad1f" xlink:to="loc_us-gaap_LoansPayable_ba4bcbdf-7e81-41e7-81fc-059c9ef31eaa" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedIncomeTaxes_d6d844cb-aeec-430f-9619-4327e5723a28" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccruedIncomeTaxes"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_0401b004-893c-405d-b909-a6b43c29ad1f" xlink:to="loc_us-gaap_AccruedIncomeTaxes_d6d844cb-aeec-430f-9619-4327e5723a28" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuritiesSoldUnderAgreementsToRepurchase_4ae1a314-e6e4-4712-9998-234ba9914ff9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SecuritiesSoldUnderAgreementsToRepurchase"/>
    <link:calculationArc order="8" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_0401b004-893c-405d-b909-a6b43c29ad1f" xlink:to="loc_us-gaap_SecuritiesSoldUnderAgreementsToRepurchase_4ae1a314-e6e4-4712-9998-234ba9914ff9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuritiesLoaned_613f8e05-61b9-411b-bfe9-08935c2bf9f5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SecuritiesLoaned"/>
    <link:calculationArc order="9" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_0401b004-893c-405d-b909-a6b43c29ad1f" xlink:to="loc_us-gaap_SecuritiesLoaned_613f8e05-61b9-411b-bfe9-08935c2bf9f5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentsSoldNotYetPurchasedAtFairValue_f0d4c8ad-835e-4693-a738-6eb1238d00f6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FinancialInstrumentsSoldNotYetPurchasedAtFairValue"/>
    <link:calculationArc order="10" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_0401b004-893c-405d-b909-a6b43c29ad1f" xlink:to="loc_us-gaap_FinancialInstrumentsSoldNotYetPurchasedAtFairValue_f0d4c8ad-835e-4693-a738-6eb1238d00f6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_7d801e6d-27cf-49b1-9d14-8fb07dfd870f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_Assets"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndSecuritiesSegregatedUnderFederalAndOtherRegulations_d192d706-efb0-4486-919e-5f28942957b4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CashAndSecuritiesSegregatedUnderFederalAndOtherRegulations"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_7d801e6d-27cf-49b1-9d14-8fb07dfd870f" xlink:to="loc_us-gaap_CashAndSecuritiesSegregatedUnderFederalAndOtherRegulations_d192d706-efb0-4486-919e-5f28942957b4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuritiesPurchasedUnderAgreementsToResell_ebe066d9-fbc7-4751-88be-1ea94657d279" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SecuritiesPurchasedUnderAgreementsToResell"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_7d801e6d-27cf-49b1-9d14-8fb07dfd870f" xlink:to="loc_us-gaap_SecuritiesPurchasedUnderAgreementsToResell_ebe066d9-fbc7-4751-88be-1ea94657d279" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuritiesBorrowed_5e469949-0561-47e6-b47d-4436392082a7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SecuritiesBorrowed"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_7d801e6d-27cf-49b1-9d14-8fb07dfd870f" xlink:to="loc_us-gaap_SecuritiesBorrowed_5e469949-0561-47e6-b47d-4436392082a7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReceivablesFromBrokersDealersAndClearingOrganizations_b1b32aed-1292-49ec-8c30-682dbc0c3739" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ReceivablesFromBrokersDealersAndClearingOrganizations"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_7d801e6d-27cf-49b1-9d14-8fb07dfd870f" xlink:to="loc_us-gaap_ReceivablesFromBrokersDealersAndClearingOrganizations_b1b32aed-1292-49ec-8c30-682dbc0c3739" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReceivablesFromCustomers_3eed89f5-b5bb-48d1-a874-3d1ee63e44e1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ReceivablesFromCustomers"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_7d801e6d-27cf-49b1-9d14-8fb07dfd870f" xlink:to="loc_us-gaap_ReceivablesFromCustomers_3eed89f5-b5bb-48d1-a874-3d1ee63e44e1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxReceivable_617ddc29-522d-4cab-a32d-78a694f0b9ba" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeTaxReceivable"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_7d801e6d-27cf-49b1-9d14-8fb07dfd870f" xlink:to="loc_us-gaap_IncomeTaxReceivable_617ddc29-522d-4cab-a32d-78a694f0b9ba" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentsOwnedAtFairValue_9ba935ea-fb7c-469b-8364-fd11802e0ab6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FinancialInstrumentsOwnedAtFairValue"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_7d801e6d-27cf-49b1-9d14-8fb07dfd870f" xlink:to="loc_us-gaap_FinancialInstrumentsOwnedAtFairValue_9ba935ea-fb7c-469b-8364-fd11802e0ab6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryGross_1fb535f2-fbd1-47c9-9f24-40f7dc67fd61" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_InventoryGross"/>
    <link:calculationArc order="8" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_7d801e6d-27cf-49b1-9d14-8fb07dfd870f" xlink:to="loc_us-gaap_InventoryGross_1fb535f2-fbd1-47c9-9f24-40f7dc67fd61" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxAssetsNet_924635da-2b01-4042-84f6-243e377bdd33" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredIncomeTaxAssetsNet"/>
    <link:calculationArc order="9" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_7d801e6d-27cf-49b1-9d14-8fb07dfd870f" xlink:to="loc_us-gaap_DeferredIncomeTaxAssetsNet_924635da-2b01-4042-84f6-243e377bdd33" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_193d7d1f-59e2-45d5-9f7c-3441549a451f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentNet"/>
    <link:calculationArc order="10" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_7d801e6d-27cf-49b1-9d14-8fb07dfd870f" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_193d7d1f-59e2-45d5-9f7c-3441549a451f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_808376d8-7f05-48ba-99d0-42f3e9087aeb" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OperatingLeaseRightOfUseAsset"/>
    <link:calculationArc order="11" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_7d801e6d-27cf-49b1-9d14-8fb07dfd870f" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAsset_808376d8-7f05-48ba-99d0-42f3e9087aeb" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_intl_GoodwillAndIntangibleAssetsNet_46ed4dce-6132-4b74-a02b-b59b336daa8d" xlink:href="intl-20230630.xsd#intl_GoodwillAndIntangibleAssetsNet"/>
    <link:calculationArc order="12" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_7d801e6d-27cf-49b1-9d14-8fb07dfd870f" xlink:to="loc_intl_GoodwillAndIntangibleAssetsNet_46ed4dce-6132-4b74-a02b-b59b336daa8d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_f02c1c27-a9d6-43b2-b554-f78b732205d9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:calculationArc order="13" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_7d801e6d-27cf-49b1-9d14-8fb07dfd870f" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_f02c1c27-a9d6-43b2-b554-f78b732205d9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotesReceivableNet_17846971-3828-408b-a7a0-86becca727dc" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NotesReceivableNet"/>
    <link:calculationArc order="14" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_7d801e6d-27cf-49b1-9d14-8fb07dfd870f" xlink:to="loc_us-gaap_NotesReceivableNet_17846971-3828-408b-a7a0-86becca727dc" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssets_74dd5f9e-395a-4cd2-9045-e915c6548bd3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherAssets"/>
    <link:calculationArc order="15" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_7d801e6d-27cf-49b1-9d14-8fb07dfd870f" xlink:to="loc_us-gaap_OtherAssets_74dd5f9e-395a-4cd2-9045-e915c6548bd3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_e8d24573-334e-4fbb-8669-64fc4c152959" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_c10ae89d-4272-4bfb-85ca-e81d20aad3d7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_e8d24573-334e-4fbb-8669-64fc4c152959" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_c10ae89d-4272-4bfb-85ca-e81d20aad3d7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapital_1ea2469f-3a1f-4487-841e-4816cbbed98f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AdditionalPaidInCapital"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_e8d24573-334e-4fbb-8669-64fc4c152959" xlink:to="loc_us-gaap_AdditionalPaidInCapital_1ea2469f-3a1f-4487-841e-4816cbbed98f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockValueOutstanding_c0e62077-c3e9-4b97-904b-f3d8805d2d10" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CommonStockValueOutstanding"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_e8d24573-334e-4fbb-8669-64fc4c152959" xlink:to="loc_us-gaap_CommonStockValueOutstanding_c0e62077-c3e9-4b97-904b-f3d8805d2d10" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_baeaa0b2-c7a7-4959-baa9-1ef776a58abe" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RetainedEarningsAccumulatedDeficit"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_e8d24573-334e-4fbb-8669-64fc4c152959" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_baeaa0b2-c7a7-4959-baa9-1ef776a58abe" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockValueOutstanding_ce8a3591-a89a-4a95-bcd5-58251f2c7b88" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PreferredStockValueOutstanding"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_e8d24573-334e-4fbb-8669-64fc4c152959" xlink:to="loc_us-gaap_PreferredStockValueOutstanding_ce8a3591-a89a-4a95-bcd5-58251f2c7b88" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonValue_8dd3381a-0375-4172-aa4e-bc6dc12ee96f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TreasuryStockCommonValue"/>
    <link:calculationArc order="6" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_e8d24573-334e-4fbb-8669-64fc4c152959" xlink:to="loc_us-gaap_TreasuryStockCommonValue_8dd3381a-0375-4172-aa4e-bc6dc12ee96f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_3bbc548b-dd5c-4860-bf48-d6ed2adf49d4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LiabilitiesAndStockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_0fad73e8-2ada-4226-ba19-0fad4da7cb07" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_Liabilities"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_3bbc548b-dd5c-4860-bf48-d6ed2adf49d4" xlink:to="loc_us-gaap_Liabilities_0fad73e8-2ada-4226-ba19-0fad4da7cb07" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommitmentsAndContingencies_8c651e4a-664f-47f8-924e-1938a6a80de9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CommitmentsAndContingencies"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_3bbc548b-dd5c-4860-bf48-d6ed2adf49d4" xlink:to="loc_us-gaap_CommitmentsAndContingencies_8c651e4a-664f-47f8-924e-1938a6a80de9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_4f111081-11f0-4392-88c7-15640c331b4f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockholdersEquity"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_3bbc548b-dd5c-4860-bf48-d6ed2adf49d4" xlink:to="loc_us-gaap_StockholdersEquity_4f111081-11f0-4392-88c7-15640c331b4f" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.intlfcstone.com/role/CondensedConsolidatedIncomeStatements" xlink:type="simple" xlink:href="intl-20230630.xsd#CondensedConsolidatedIncomeStatements"/>
  <link:calculationLink xlink:role="http://www.intlfcstone.com/role/CondensedConsolidatedIncomeStatements" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_8e9fc66c-2f66-4f9d-9e30-23c3eaa48a0c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoninterestExpense_dfab2c7e-b4f4-4ee5-b255-c76cc260abd4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NoninterestExpense"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_8e9fc66c-2f66-4f9d-9e30-23c3eaa48a0c" xlink:to="loc_us-gaap_NoninterestExpense_dfab2c7e-b4f4-4ee5-b255-c76cc260abd4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenuesNetOfInterestExpense_a5fda1d1-0314-4eb4-80c4-2e67cc080a20" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevenuesNetOfInterestExpense"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_8e9fc66c-2f66-4f9d-9e30-23c3eaa48a0c" xlink:to="loc_us-gaap_RevenuesNetOfInterestExpense_a5fda1d1-0314-4eb4-80c4-2e67cc080a20" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_intl_GainLossOnAcquisitionsAndOther_f3223d7d-efff-4909-a21e-e2e5d1f23723" xlink:href="intl-20230630.xsd#intl_GainLossOnAcquisitionsAndOther"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_8e9fc66c-2f66-4f9d-9e30-23c3eaa48a0c" xlink:to="loc_intl_GainLossOnAcquisitionsAndOther_f3223d7d-efff-4909-a21e-e2e5d1f23723" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GrossProfit_14086b4d-dd93-460d-85b7-118a8eaa3bb7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GrossProfit"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_fd7dfa20-064b-470b-b0cb-ad9ee7a07d4a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_Revenues"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_GrossProfit_14086b4d-dd93-460d-85b7-118a8eaa3bb7" xlink:to="loc_us-gaap_Revenues_fd7dfa20-064b-470b-b0cb-ad9ee7a07d4a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization_77e49cf9-d138-4c76-859e-24fc993261b9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_GrossProfit_14086b4d-dd93-460d-85b7-118a8eaa3bb7" xlink:to="loc_us-gaap_CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization_77e49cf9-d138-4c76-859e-24fc993261b9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_204c7bd1-2a70-4590-a31f-f99eb05352d9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NetIncomeLoss"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_20af4afc-51a8-495e-910a-65195c66f627" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLoss_204c7bd1-2a70-4590-a31f-f99eb05352d9" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_20af4afc-51a8-495e-910a-65195c66f627" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_d4e5222c-efbc-4cfa-aa6c-d0e5c4a0775a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLoss_204c7bd1-2a70-4590-a31f-f99eb05352d9" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_d4e5222c-efbc-4cfa-aa6c-d0e5c4a0775a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenuesNetOfInterestExpense_0bfa2542-8925-4bd9-b758-3ac0fe97cfb7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevenuesNetOfInterestExpense"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GrossProfit_cd423eb4-f41e-4573-99d2-8ca06159b83b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GrossProfit"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_RevenuesNetOfInterestExpense_0bfa2542-8925-4bd9-b758-3ac0fe97cfb7" xlink:to="loc_us-gaap_GrossProfit_cd423eb4-f41e-4573-99d2-8ca06159b83b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FloorBrokerageExchangeAndClearanceFees_eb81bcc8-1a91-428d-a07e-cbe416fa8b88" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FloorBrokerageExchangeAndClearanceFees"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_RevenuesNetOfInterestExpense_0bfa2542-8925-4bd9-b758-3ac0fe97cfb7" xlink:to="loc_us-gaap_FloorBrokerageExchangeAndClearanceFees_eb81bcc8-1a91-428d-a07e-cbe416fa8b88" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoninterestExpenseCommissionExpense_7ccde7dc-38b4-4ad8-a26e-6cb40a8ec6f9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NoninterestExpenseCommissionExpense"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_RevenuesNetOfInterestExpense_0bfa2542-8925-4bd9-b758-3ac0fe97cfb7" xlink:to="loc_us-gaap_NoninterestExpenseCommissionExpense_7ccde7dc-38b4-4ad8-a26e-6cb40a8ec6f9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpense_bb65cd62-b21b-48d3-ab69-ac4d9b01eabe" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_InterestExpense"/>
    <link:calculationArc order="4" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_RevenuesNetOfInterestExpense_0bfa2542-8925-4bd9-b758-3ac0fe97cfb7" xlink:to="loc_us-gaap_InterestExpense_bb65cd62-b21b-48d3-ab69-ac4d9b01eabe" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_intl_InterestExpenseOnCorporateFunding_a06aa2a2-3f78-4b84-b5dc-6853ea8adbfe" xlink:href="intl-20230630.xsd#intl_InterestExpenseOnCorporateFunding"/>
    <link:calculationArc order="5" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_RevenuesNetOfInterestExpense_0bfa2542-8925-4bd9-b758-3ac0fe97cfb7" xlink:to="loc_intl_InterestExpenseOnCorporateFunding_a06aa2a2-3f78-4b84-b5dc-6853ea8adbfe" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoninterestExpense_77f5da7c-df61-4b19-87b3-5b5da4a97285" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NoninterestExpense"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LaborAndRelatedExpense_9bc38f4b-db3b-420d-9978-edd166994992" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LaborAndRelatedExpense"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NoninterestExpense_77f5da7c-df61-4b19-87b3-5b5da4a97285" xlink:to="loc_us-gaap_LaborAndRelatedExpense_9bc38f4b-db3b-420d-9978-edd166994992" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_intl_Tradingsystemsandmarketinformation_1687c17b-e0b8-4c3b-87e1-819a466caa71" xlink:href="intl-20230630.xsd#intl_Tradingsystemsandmarketinformation"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NoninterestExpense_77f5da7c-df61-4b19-87b3-5b5da4a97285" xlink:to="loc_intl_Tradingsystemsandmarketinformation_1687c17b-e0b8-4c3b-87e1-819a466caa71" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfessionalFees_884423ba-3f0c-452c-9c79-34c80e425d46" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ProfessionalFees"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NoninterestExpense_77f5da7c-df61-4b19-87b3-5b5da4a97285" xlink:to="loc_us-gaap_ProfessionalFees_884423ba-3f0c-452c-9c79-34c80e425d46" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InformationTechnologyAndDataProcessing_b6821456-8942-4173-89d2-5cb0e0bfab5c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_InformationTechnologyAndDataProcessing"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NoninterestExpense_77f5da7c-df61-4b19-87b3-5b5da4a97285" xlink:to="loc_us-gaap_InformationTechnologyAndDataProcessing_b6821456-8942-4173-89d2-5cb0e0bfab5c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OccupancyNet_e3685cb3-dc4c-4f45-9c04-2406ce4765b9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OccupancyNet"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NoninterestExpense_77f5da7c-df61-4b19-87b3-5b5da4a97285" xlink:to="loc_us-gaap_OccupancyNet_e3685cb3-dc4c-4f45-9c04-2406ce4765b9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingAndMarketingExpense_110c8649-15cf-4f19-8351-d84e9b74ca38" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SellingAndMarketingExpense"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NoninterestExpense_77f5da7c-df61-4b19-87b3-5b5da4a97285" xlink:to="loc_us-gaap_SellingAndMarketingExpense_110c8649-15cf-4f19-8351-d84e9b74ca38" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TravelAndEntertainmentExpense_00afb400-0905-4e9d-b8b1-689afec5f940" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TravelAndEntertainmentExpense"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NoninterestExpense_77f5da7c-df61-4b19-87b3-5b5da4a97285" xlink:to="loc_us-gaap_TravelAndEntertainmentExpense_00afb400-0905-4e9d-b8b1-689afec5f940" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Communication_2966731d-ca95-47bd-b940-d52dac164b05" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_Communication"/>
    <link:calculationArc order="8" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NoninterestExpense_77f5da7c-df61-4b19-87b3-5b5da4a97285" xlink:to="loc_us-gaap_Communication_2966731d-ca95-47bd-b940-d52dac164b05" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationDepletionAndAmortization_1ee4f67b-32cf-4579-9b9a-5fd0cde74750" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DepreciationDepletionAndAmortization"/>
    <link:calculationArc order="9" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NoninterestExpense_77f5da7c-df61-4b19-87b3-5b5da4a97285" xlink:to="loc_us-gaap_DepreciationDepletionAndAmortization_1ee4f67b-32cf-4579-9b9a-5fd0cde74750" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProvisionForDoubtfulAccounts_84d130e7-6189-40ee-b761-6c6421282957" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ProvisionForDoubtfulAccounts"/>
    <link:calculationArc order="10" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NoninterestExpense_77f5da7c-df61-4b19-87b3-5b5da4a97285" xlink:to="loc_us-gaap_ProvisionForDoubtfulAccounts_84d130e7-6189-40ee-b761-6c6421282957" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNoninterestExpense_9e3e73f9-e80b-4986-ac7e-40bcbedefac0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherNoninterestExpense"/>
    <link:calculationArc order="11" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NoninterestExpense_77f5da7c-df61-4b19-87b3-5b5da4a97285" xlink:to="loc_us-gaap_OtherNoninterestExpense_9e3e73f9-e80b-4986-ac7e-40bcbedefac0" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.intlfcstone.com/role/CondensedConsolidatedStatementsofComprehensiveIncome" xlink:type="simple" xlink:href="intl-20230630.xsd#CondensedConsolidatedStatementsofComprehensiveIncome"/>
  <link:calculationLink xlink:role="http://www.intlfcstone.com/role/CondensedConsolidatedStatementsofComprehensiveIncome" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_6efe3c3e-a76c-4170-af2d-6da60837cf69" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent_d7f895de-d185-4b78-b4c0-3b8b80c4c2b6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_6efe3c3e-a76c-4170-af2d-6da60837cf69" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent_d7f895de-d185-4b78-b4c0-3b8b80c4c2b6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent_0be81f7b-45bc-4bbf-9ceb-d1e546e24651" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_6efe3c3e-a76c-4170-af2d-6da60837cf69" xlink:to="loc_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent_0be81f7b-45bc-4bbf-9ceb-d1e546e24651" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTax_9eb05ec6-8632-4df7-a8e1-40d00c4dd3b0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ComprehensiveIncomeNetOfTax"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_9481f85f-3e3b-41b8-9dd3-47bce1aecd98" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NetIncomeLoss"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTax_9eb05ec6-8632-4df7-a8e1-40d00c4dd3b0" xlink:to="loc_us-gaap_NetIncomeLoss_9481f85f-3e3b-41b8-9dd3-47bce1aecd98" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_29649828-88a4-4233-87cb-041e1cfb5bbe" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTax_9eb05ec6-8632-4df7-a8e1-40d00c4dd3b0" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_29649828-88a4-4233-87cb-041e1cfb5bbe" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.intlfcstone.com/role/CondensedConsolidatedStatementsofCashFlows" xlink:type="simple" xlink:href="intl-20230630.xsd#CondensedConsolidatedStatementsofCashFlows"/>
  <link:calculationLink xlink:role="http://www.intlfcstone.com/role/CondensedConsolidatedStatementsofCashFlows" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_44100753-70d8-41d4-b554-59a18b8bb636" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_1cef4603-87ed-4e54-88ad-0f17d0fd1fae" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_44100753-70d8-41d4-b554-59a18b8bb636" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_1cef4603-87ed-4e54-88ad-0f17d0fd1fae" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationAndAmortization_26380b3b-2aef-4ab4-9552-9e817a6783f2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DepreciationAndAmortization"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_44100753-70d8-41d4-b554-59a18b8bb636" xlink:to="loc_us-gaap_DepreciationAndAmortization_26380b3b-2aef-4ab4-9552-9e817a6783f2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInRestrictedCashAndInvestmentsForOperatingActivities_65836738-7216-432e-89ea-dafd0e5a95e6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncreaseDecreaseInRestrictedCashAndInvestmentsForOperatingActivities"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_44100753-70d8-41d4-b554-59a18b8bb636" xlink:to="loc_us-gaap_IncreaseDecreaseInRestrictedCashAndInvestmentsForOperatingActivities_65836738-7216-432e-89ea-dafd0e5a95e6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensation_3c7a3c6a-2ab3-4246-9f1d-7f140caaceed" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensation"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_44100753-70d8-41d4-b554-59a18b8bb636" xlink:to="loc_us-gaap_ShareBasedCompensation_3c7a3c6a-2ab3-4246-9f1d-7f140caaceed" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInPayablesToCustomers_e6c26aa5-7a2d-4d5c-9986-018a7ce7f50e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncreaseDecreaseInPayablesToCustomers"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_44100753-70d8-41d4-b554-59a18b8bb636" xlink:to="loc_us-gaap_IncreaseDecreaseInPayablesToCustomers_e6c26aa5-7a2d-4d5c-9986-018a7ce7f50e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInPayablesToBrokerDealers_23872c1f-158e-4b6a-8efa-db633a1ca71b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncreaseDecreaseInPayablesToBrokerDealers"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_44100753-70d8-41d4-b554-59a18b8bb636" xlink:to="loc_us-gaap_IncreaseDecreaseInPayablesToBrokerDealers_23872c1f-158e-4b6a-8efa-db633a1ca71b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfFinancingCostsAndDiscounts_27cd7510-ebec-4a76-b8d2-9164ff0a80ef" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AmortizationOfFinancingCostsAndDiscounts"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_44100753-70d8-41d4-b554-59a18b8bb636" xlink:to="loc_us-gaap_AmortizationOfFinancingCostsAndDiscounts_27cd7510-ebec-4a76-b8d2-9164ff0a80ef" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAssetAmortizationExpense_a539b367-cc05-4899-8b1c-e385ca789665" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OperatingLeaseRightOfUseAssetAmortizationExpense"/>
    <link:calculationArc order="8" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_44100753-70d8-41d4-b554-59a18b8bb636" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAssetAmortizationExpense_a539b367-cc05-4899-8b1c-e385ca789665" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_89ae0022-53d0-4836-8a6e-ee9e32781f60" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncreaseDecreaseInAccountsReceivable"/>
    <link:calculationArc order="9" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_44100753-70d8-41d4-b554-59a18b8bb636" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_89ae0022-53d0-4836-8a6e-ee9e32781f60" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInInventories_cfd671b6-7a02-41bd-8139-436989bc35ea" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncreaseDecreaseInInventories"/>
    <link:calculationArc order="10" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_44100753-70d8-41d4-b554-59a18b8bb636" xlink:to="loc_us-gaap_IncreaseDecreaseInInventories_cfd671b6-7a02-41bd-8139-436989bc35ea" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInPayablesUnderRepurchaseAgreements_7ee071f2-3f18-473a-a131-ef66240ac685" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncreaseDecreaseInPayablesUnderRepurchaseAgreements"/>
    <link:calculationArc order="11" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_44100753-70d8-41d4-b554-59a18b8bb636" xlink:to="loc_us-gaap_IncreaseDecreaseInPayablesUnderRepurchaseAgreements_7ee071f2-3f18-473a-a131-ef66240ac685" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInSecuritiesBorrowed_164a6566-4613-4dec-bfa9-a82fcc3f256d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncreaseDecreaseInSecuritiesBorrowed"/>
    <link:calculationArc order="12" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_44100753-70d8-41d4-b554-59a18b8bb636" xlink:to="loc_us-gaap_IncreaseDecreaseInSecuritiesBorrowed_164a6566-4613-4dec-bfa9-a82fcc3f256d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInFinancialInstrumentsUsedInOperatingActivities_de540ca2-1d70-4d54-bdea-886e85a1b069" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncreaseDecreaseInFinancialInstrumentsUsedInOperatingActivities"/>
    <link:calculationArc order="13" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_44100753-70d8-41d4-b554-59a18b8bb636" xlink:to="loc_us-gaap_IncreaseDecreaseInFinancialInstrumentsUsedInOperatingActivities_de540ca2-1d70-4d54-bdea-886e85a1b069" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInSecuritiesLoanedTransactions_3be5589f-0a99-46be-b20a-72f0af6a4cf9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncreaseDecreaseInSecuritiesLoanedTransactions"/>
    <link:calculationArc order="14" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_44100753-70d8-41d4-b554-59a18b8bb636" xlink:to="loc_us-gaap_IncreaseDecreaseInSecuritiesLoanedTransactions_3be5589f-0a99-46be-b20a-72f0af6a4cf9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInReceivablesUnderRepurchaseAgreements_ab8f4838-e4b8-4d78-8a9b-0715746214c3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncreaseDecreaseInReceivablesUnderRepurchaseAgreements"/>
    <link:calculationArc order="15" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_44100753-70d8-41d4-b554-59a18b8bb636" xlink:to="loc_us-gaap_IncreaseDecreaseInReceivablesUnderRepurchaseAgreements_ab8f4838-e4b8-4d78-8a9b-0715746214c3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_587b4b4d-ef3b-40b8-9bb3-7407cecfb4ef" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NetIncomeLoss"/>
    <link:calculationArc order="16" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_44100753-70d8-41d4-b554-59a18b8bb636" xlink:to="loc_us-gaap_NetIncomeLoss_587b4b4d-ef3b-40b8-9bb3-7407cecfb4ef" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable_c99208fe-2ac2-4967-8fa9-2718ae3409d0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable"/>
    <link:calculationArc order="17" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_44100753-70d8-41d4-b554-59a18b8bb636" xlink:to="loc_us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable_c99208fe-2ac2-4967-8fa9-2718ae3409d0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProvisionForDoubtfulAccounts_4186dddf-df5a-4213-ad00-570b781f8652" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ProvisionForDoubtfulAccounts"/>
    <link:calculationArc order="18" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_44100753-70d8-41d4-b554-59a18b8bb636" xlink:to="loc_us-gaap_ProvisionForDoubtfulAccounts_4186dddf-df5a-4213-ad00-570b781f8652" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_intl_IncreaseDecreaseInOperatingLeaseLiabilities_72d3bcd1-c5e6-4c43-9a30-54e116fed240" xlink:href="intl-20230630.xsd#intl_IncreaseDecreaseInOperatingLeaseLiabilities"/>
    <link:calculationArc order="19" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_44100753-70d8-41d4-b554-59a18b8bb636" xlink:to="loc_intl_IncreaseDecreaseInOperatingLeaseLiabilities_72d3bcd1-c5e6-4c43-9a30-54e116fed240" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_af3141ca-2b85-4498-ab9a-dc2ad183bfe1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredIncomeTaxExpenseBenefit"/>
    <link:calculationArc order="20" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_44100753-70d8-41d4-b554-59a18b8bb636" xlink:to="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_af3141ca-2b85-4498-ab9a-dc2ad183bfe1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInIncomeTaxesReceivable_ad3a74a6-038f-4209-8882-3bc11f801662" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncreaseDecreaseInIncomeTaxesReceivable"/>
    <link:calculationArc order="21" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_44100753-70d8-41d4-b554-59a18b8bb636" xlink:to="loc_us-gaap_IncreaseDecreaseInIncomeTaxesReceivable_ad3a74a6-038f-4209-8882-3bc11f801662" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_16924f75-c33a-41c7-98ba-98c504fd601f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets"/>
    <link:calculationArc order="22" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_44100753-70d8-41d4-b554-59a18b8bb636" xlink:to="loc_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_16924f75-c33a-41c7-98ba-98c504fd601f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInFinancialInstrumentsSoldNotYetPurchased_543f9bce-7db3-41f7-9b2b-82ae37cf9e5a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncreaseDecreaseInFinancialInstrumentsSoldNotYetPurchased"/>
    <link:calculationArc order="23" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_44100753-70d8-41d4-b554-59a18b8bb636" xlink:to="loc_us-gaap_IncreaseDecreaseInFinancialInstrumentsSoldNotYetPurchased_543f9bce-7db3-41f7-9b2b-82ae37cf9e5a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInFinanceReceivables_6e7baed4-6c0b-4606-818a-a65eaf17b0e9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncreaseDecreaseInFinanceReceivables"/>
    <link:calculationArc order="24" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_44100753-70d8-41d4-b554-59a18b8bb636" xlink:to="loc_us-gaap_IncreaseDecreaseInFinanceReceivables_6e7baed4-6c0b-4606-818a-a65eaf17b0e9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInBrokerageReceivables_ddee8efd-06ed-4ca1-a4a3-0ac0532ac095" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncreaseDecreaseInBrokerageReceivables"/>
    <link:calculationArc order="25" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_44100753-70d8-41d4-b554-59a18b8bb636" xlink:to="loc_us-gaap_IncreaseDecreaseInBrokerageReceivables_ddee8efd-06ed-4ca1-a4a3-0ac0532ac095" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount_e7ab08a0-b182-42f0-bb19-eba8d62ec422" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount"/>
    <link:calculationArc order="26" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_44100753-70d8-41d4-b554-59a18b8bb636" xlink:to="loc_us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount_e7ab08a0-b182-42f0-bb19-eba8d62ec422" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_d6a5d615-c662-410e-b10d-bd99db6bf78f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_cf0256a4-58ed-4732-85f3-553454d2cd07" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_d6a5d615-c662-410e-b10d-bd99db6bf78f" xlink:to="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_cf0256a4-58ed-4732-85f3-553454d2cd07" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_intl_ProceedsFromSaleOfExchangeMembershipsAndCommonStock_32613c13-bcae-4028-ae9b-5f1eb2f5bce3" xlink:href="intl-20230630.xsd#intl_ProceedsFromSaleOfExchangeMembershipsAndCommonStock"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_d6a5d615-c662-410e-b10d-bd99db6bf78f" xlink:to="loc_intl_ProceedsFromSaleOfExchangeMembershipsAndCommonStock_32613c13-bcae-4028-ae9b-5f1eb2f5bce3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_b6950eed-aaa8-4c36-96d8-d1fab268c744" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_d6a5d615-c662-410e-b10d-bd99db6bf78f" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_b6950eed-aaa8-4c36-96d8-d1fab268c744" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncashOrPartNoncashAcquisitionNetNonmonetaryAssetsAcquiredLiabilitiesAssumed1_f4d82887-9b3e-474e-ad69-e50ec1678f1d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NoncashOrPartNoncashAcquisitionNetNonmonetaryAssetsAcquiredLiabilitiesAssumed1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncashOrPartNoncashAcquisitionValueOfLiabilitiesAssumed1_ad79be00-9899-4df6-9275-4ca765bd4dce" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NoncashOrPartNoncashAcquisitionValueOfLiabilitiesAssumed1"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NoncashOrPartNoncashAcquisitionNetNonmonetaryAssetsAcquiredLiabilitiesAssumed1_f4d82887-9b3e-474e-ad69-e50ec1678f1d" xlink:to="loc_us-gaap_NoncashOrPartNoncashAcquisitionValueOfLiabilitiesAssumed1_ad79be00-9899-4df6-9275-4ca765bd4dce" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncashOrPartNoncashAcquisitionValueOfAssetsAcquired1_61319aa1-1f99-4f44-9765-a5719112a91f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NoncashOrPartNoncashAcquisitionValueOfAssetsAcquired1"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NoncashOrPartNoncashAcquisitionNetNonmonetaryAssetsAcquiredLiabilitiesAssumed1_f4d82887-9b3e-474e-ad69-e50ec1678f1d" xlink:to="loc_us-gaap_NoncashOrPartNoncashAcquisitionValueOfAssetsAcquired1_61319aa1-1f99-4f44-9765-a5719112a91f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_b3f350a7-546c-4b40-847c-eeb2dfe186b3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_0e9eee99-029e-4ac9-b41f-f6c25bc61891" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_b3f350a7-546c-4b40-847c-eeb2dfe186b3" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_0e9eee99-029e-4ac9-b41f-f6c25bc61891" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_3b6962e1-691f-4621-b6f8-3d2a8c29cf7b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_b3f350a7-546c-4b40-847c-eeb2dfe186b3" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_3b6962e1-691f-4621-b6f8-3d2a8c29cf7b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_9051d17c-1d0b-45c2-890d-e7b60450ab68" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_b3f350a7-546c-4b40-847c-eeb2dfe186b3" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_9051d17c-1d0b-45c2-890d-e7b60450ab68" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_57a0c2ea-5d23-4227-871a-15a21defb250" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_b3f350a7-546c-4b40-847c-eeb2dfe186b3" xlink:to="loc_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_57a0c2ea-5d23-4227-871a-15a21defb250" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_966ae398-6691-49c7-a463-072ea2f92b12" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashSegregatedUnderCommodityExchangeActRegulation_15bbb51c-8edc-43ce-a4c9-b07b16628402" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CashSegregatedUnderCommodityExchangeActRegulation"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_966ae398-6691-49c7-a463-072ea2f92b12" xlink:to="loc_us-gaap_CashSegregatedUnderCommodityExchangeActRegulation_15bbb51c-8edc-43ce-a4c9-b07b16628402" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_intl_CashSegregatedAndDepositedWithOrPledgedToExchangeClearingOrganizationsAndOtherFuturesCommissionMerchants_ba6b3264-d54c-4d9c-8258-f3c6aa9a5584" xlink:href="intl-20230630.xsd#intl_CashSegregatedAndDepositedWithOrPledgedToExchangeClearingOrganizationsAndOtherFuturesCommissionMerchants"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_966ae398-6691-49c7-a463-072ea2f92b12" xlink:to="loc_intl_CashSegregatedAndDepositedWithOrPledgedToExchangeClearingOrganizationsAndOtherFuturesCommissionMerchants_ba6b3264-d54c-4d9c-8258-f3c6aa9a5584" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuritiesSegregatedUnderOtherRegulations_da0d3d95-978b-42b3-83d7-72f591e5ea9f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SecuritiesSegregatedUnderOtherRegulations"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_966ae398-6691-49c7-a463-072ea2f92b12" xlink:to="loc_us-gaap_SecuritiesSegregatedUnderOtherRegulations_da0d3d95-978b-42b3-83d7-72f591e5ea9f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_ed4bc59d-cf55-4084-8520-6af954ae99ce" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_966ae398-6691-49c7-a463-072ea2f92b12" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_ed4bc59d-cf55-4084-8520-6af954ae99ce" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_intl_SecuritiesSegregatedUnderFederalAndOtherRegulations_44d254f2-cc80-4f3e-a6d0-8aecab0691e9" xlink:href="intl-20230630.xsd#intl_SecuritiesSegregatedUnderFederalAndOtherRegulations"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_966ae398-6691-49c7-a463-072ea2f92b12" xlink:to="loc_intl_SecuritiesSegregatedUnderFederalAndOtherRegulations_44d254f2-cc80-4f3e-a6d0-8aecab0691e9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_24e28fbb-811d-46aa-9d93-2a87aadc039a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfSecuredDebt_57294754-e04c-499b-8432-8c84ceee2672" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RepaymentsOfSecuredDebt"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_24e28fbb-811d-46aa-9d93-2a87aadc039a" xlink:to="loc_us-gaap_RepaymentsOfSecuredDebt_57294754-e04c-499b-8432-8c84ceee2672" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentForContingentConsiderationLiabilityFinancingActivities_b5e8e267-9dbd-46b6-bae7-dd3cbcbd662f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PaymentForContingentConsiderationLiabilityFinancingActivities"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_24e28fbb-811d-46aa-9d93-2a87aadc039a" xlink:to="loc_us-gaap_PaymentForContingentConsiderationLiabilityFinancingActivities_b5e8e267-9dbd-46b6-bae7-dd3cbcbd662f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromRepaymentsOfShortTermDebtMaturingInThreeMonthsOrLess_ef9ec72b-6777-4b6b-aa81-df596666a658" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ProceedsFromRepaymentsOfShortTermDebtMaturingInThreeMonthsOrLess"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_24e28fbb-811d-46aa-9d93-2a87aadc039a" xlink:to="loc_us-gaap_ProceedsFromRepaymentsOfShortTermDebtMaturingInThreeMonthsOrLess_ef9ec72b-6777-4b6b-aa81-df596666a658" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfShortTermDebtMaturingInMoreThanThreeMonths_1baec12a-255b-4ef9-b0c7-3fa6b7dc1554" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RepaymentsOfShortTermDebtMaturingInMoreThanThreeMonths"/>
    <link:calculationArc order="4" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_24e28fbb-811d-46aa-9d93-2a87aadc039a" xlink:to="loc_us-gaap_RepaymentsOfShortTermDebtMaturingInMoreThanThreeMonths_1baec12a-255b-4ef9-b0c7-3fa6b7dc1554" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromShortTermDebtMaturingInMoreThanThreeMonths_6f9f9399-13d4-44f0-99a5-05989068e187" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ProceedsFromShortTermDebtMaturingInMoreThanThreeMonths"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_24e28fbb-811d-46aa-9d93-2a87aadc039a" xlink:to="loc_us-gaap_ProceedsFromShortTermDebtMaturingInMoreThanThreeMonths_6f9f9399-13d4-44f0-99a5-05989068e187" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_intl_PaymentForDeferredContingentConsiderationLiabilityFinancingActivities_41ddd7dd-60e2-4597-9d24-2e2dcee30a17" xlink:href="intl-20230630.xsd#intl_PaymentForDeferredContingentConsiderationLiabilityFinancingActivities"/>
    <link:calculationArc order="6" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_24e28fbb-811d-46aa-9d93-2a87aadc039a" xlink:to="loc_intl_PaymentForDeferredContingentConsiderationLiabilityFinancingActivities_41ddd7dd-60e2-4597-9d24-2e2dcee30a17" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromStockOptionsExercised_93c1d05f-ecfb-4e6b-87c1-48d2c43ff741" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ProceedsFromStockOptionsExercised"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_24e28fbb-811d-46aa-9d93-2a87aadc039a" xlink:to="loc_us-gaap_ProceedsFromStockOptionsExercised_93c1d05f-ecfb-4e6b-87c1-48d2c43ff741" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.intlfcstone.com/role/EarningsperShareEPSReconciliationDetails" xlink:type="simple" xlink:href="intl-20230630.xsd#EarningsperShareEPSReconciliationDetails"/>
  <link:calculationLink xlink:role="http://www.intlfcstone.com/role/EarningsperShareEPSReconciliationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_intl_Incomefromcontinuingoperationsallocatedtocommonshareholders_c96c0d8f-c238-47a6-96cd-c7173b41a0ce" xlink:href="intl-20230630.xsd#intl_Incomefromcontinuingoperationsallocatedtocommonshareholders"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperations_0cb24093-3066-4780-99d5-d0ebb20637de" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeLossFromContinuingOperations"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_intl_Incomefromcontinuingoperationsallocatedtocommonshareholders_c96c0d8f-c238-47a6-96cd-c7173b41a0ce" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperations_0cb24093-3066-4780-99d5-d0ebb20637de" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_intl_UndistributedEarningsAllocatedtoParticipatingSecuritiesContinuingOperations_eb3cc47f-db95-4d12-91a7-6ce3ba67855d" xlink:href="intl-20230630.xsd#intl_UndistributedEarningsAllocatedtoParticipatingSecuritiesContinuingOperations"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_intl_Incomefromcontinuingoperationsallocatedtocommonshareholders_c96c0d8f-c238-47a6-96cd-c7173b41a0ce" xlink:to="loc_intl_UndistributedEarningsAllocatedtoParticipatingSecuritiesContinuingOperations_eb3cc47f-db95-4d12-91a7-6ce3ba67855d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_240e3df5-a1ba-49b4-9fc5-5d98a5a07b38" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_2fd2b7f7-ecdd-449a-99a9-534928ffdd7d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_240e3df5-a1ba-49b4-9fc5-5d98a5a07b38" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_2fd2b7f7-ecdd-449a-99a9-534928ffdd7d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_d98aef21-41de-4d19-b9e3-11f2041bbd58" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_240e3df5-a1ba-49b4-9fc5-5d98a5a07b38" xlink:to="loc_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_d98aef21-41de-4d19-b9e3-11f2041bbd58" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.intlfcstone.com/role/AssetsandLiabilitiesatFairValueFinancialAssetsandLiabilitiesMeasuredatFairValueDetails" xlink:type="simple" xlink:href="intl-20230630.xsd#AssetsandLiabilitiesatFairValueFinancialAssetsandLiabilitiesMeasuredatFairValueDetails"/>
  <link:calculationLink xlink:role="http://www.intlfcstone.com/role/AssetsandLiabilitiesatFairValueFinancialAssetsandLiabilitiesMeasuredatFairValueDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosure_30e91a6d-f41c-419f-8502-a838a4577879" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LiabilitiesFairValueDisclosure"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentsSoldNotYetPurchasedAtFairValue_1c1c1f04-7d0f-46d3-906e-9490b181dc4f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FinancialInstrumentsSoldNotYetPurchasedAtFairValue"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosure_30e91a6d-f41c-419f-8502-a838a4577879" xlink:to="loc_us-gaap_FinancialInstrumentsSoldNotYetPurchasedAtFairValue_1c1c1f04-7d0f-46d3-906e-9490b181dc4f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableAndOtherAccruedLiabilities_05257043-f497-4cba-966e-d0b3baf8c58c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccountsPayableAndOtherAccruedLiabilities"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosure_30e91a6d-f41c-419f-8502-a838a4577879" xlink:to="loc_us-gaap_AccountsPayableAndOtherAccruedLiabilities_05257043-f497-4cba-966e-d0b3baf8c58c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_intl_AccountsPayableIncludingNettingAdjustmentFairValueDisclosure_1a9530b7-8663-4cc3-a372-57c6041a1db1" xlink:href="intl-20230630.xsd#intl_AccountsPayableIncludingNettingAdjustmentFairValueDisclosure"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosure_30e91a6d-f41c-419f-8502-a838a4577879" xlink:to="loc_intl_AccountsPayableIncludingNettingAdjustmentFairValueDisclosure_1a9530b7-8663-4cc3-a372-57c6041a1db1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_intl_BrokerDealerPayableToOtherBrokerDealerAndClearingOrganizationIncludingNettingAdjustment_cedea4e4-da0f-4dfc-aa82-e45066156441" xlink:href="intl-20230630.xsd#intl_BrokerDealerPayableToOtherBrokerDealerAndClearingOrganizationIncludingNettingAdjustment"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosure_30e91a6d-f41c-419f-8502-a838a4577879" xlink:to="loc_intl_BrokerDealerPayableToOtherBrokerDealerAndClearingOrganizationIncludingNettingAdjustment_cedea4e4-da0f-4dfc-aa82-e45066156441" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsFairValueDisclosure_dff58899-2f43-4e65-bab8-0d0eb7ec0949" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AssetsFairValueDisclosure"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Cash_1b6773eb-b7b7-426d-a2ea-398c1af6ed27" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_Cash"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsFairValueDisclosure_dff58899-2f43-4e65-bab8-0d0eb7ec0949" xlink:to="loc_us-gaap_Cash_1b6773eb-b7b7-426d-a2ea-398c1af6ed27" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_24c93c68-d9d5-4213-a855-f6a69da5093d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CashAndCashEquivalentsFairValueDisclosure"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsFairValueDisclosure_dff58899-2f43-4e65-bab8-0d0eb7ec0949" xlink:to="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_24c93c68-d9d5-4213-a855-f6a69da5093d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndSecuritiesSegregatedUnderFederalAndOtherRegulations_7e0063f3-5eba-4a2e-95f2-bd7dcc7ae9af" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CashAndSecuritiesSegregatedUnderFederalAndOtherRegulations"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsFairValueDisclosure_dff58899-2f43-4e65-bab8-0d0eb7ec0949" xlink:to="loc_us-gaap_CashAndSecuritiesSegregatedUnderFederalAndOtherRegulations_7e0063f3-5eba-4a2e-95f2-bd7dcc7ae9af" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentsOwnedAtFairValue_bd376d4e-6697-4ef0-ae73-15979d32491f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FinancialInstrumentsOwnedAtFairValue"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsFairValueDisclosure_dff58899-2f43-4e65-bab8-0d0eb7ec0949" xlink:to="loc_us-gaap_FinancialInstrumentsOwnedAtFairValue_bd376d4e-6697-4ef0-ae73-15979d32491f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryGross_110803be-5eef-45cd-8448-85dfc780a356" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_InventoryGross"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsFairValueDisclosure_dff58899-2f43-4e65-bab8-0d0eb7ec0949" xlink:to="loc_us-gaap_InventoryGross_110803be-5eef-45cd-8448-85dfc780a356" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_intl_AccountsReceivableIncludingNettingAdjustmentFairValueDisclosure_7be62c1c-1db8-4519-b6b2-20a79ddb62d9" xlink:href="intl-20230630.xsd#intl_AccountsReceivableIncludingNettingAdjustmentFairValueDisclosure"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsFairValueDisclosure_dff58899-2f43-4e65-bab8-0d0eb7ec0949" xlink:to="loc_intl_AccountsReceivableIncludingNettingAdjustmentFairValueDisclosure_7be62c1c-1db8-4519-b6b2-20a79ddb62d9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_intl_ReceivablesFromClearingOrganizationsIncludingNettingAdjustment_8912e24f-080d-4ce4-bab8-9f0162b3854c" xlink:href="intl-20230630.xsd#intl_ReceivablesFromClearingOrganizationsIncludingNettingAdjustment"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsFairValueDisclosure_dff58899-2f43-4e65-bab8-0d0eb7ec0949" xlink:to="loc_intl_ReceivablesFromClearingOrganizationsIncludingNettingAdjustment_8912e24f-080d-4ce4-bab8-9f0162b3854c" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.intlfcstone.com/role/PhysicalCommoditiesInventoryPhysicalCommoditiesInventoryDetails" xlink:type="simple" xlink:href="intl-20230630.xsd#PhysicalCommoditiesInventoryPhysicalCommoditiesInventoryDetails"/>
  <link:calculationLink xlink:role="http://www.intlfcstone.com/role/PhysicalCommoditiesInventoryPhysicalCommoditiesInventoryDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryNet_3d18843f-b977-4d81-bae2-c3a44851429b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_InventoryNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AgriculturalRelatedInventory_24241ef4-1030-43a4-8430-c8c37418bbce" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AgriculturalRelatedInventory"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_InventoryNet_3d18843f-b977-4d81-bae2-c3a44851429b" xlink:to="loc_us-gaap_AgriculturalRelatedInventory_24241ef4-1030-43a4-8430-c8c37418bbce" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_intl_PhysicalCommoditiesInventoryAtFairValue_7a6b8e5c-aefa-4511-a459-2fa9def50cb2" xlink:href="intl-20230630.xsd#intl_PhysicalCommoditiesInventoryAtFairValue"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_InventoryNet_3d18843f-b977-4d81-bae2-c3a44851429b" xlink:to="loc_intl_PhysicalCommoditiesInventoryAtFairValue_7a6b8e5c-aefa-4511-a459-2fa9def50cb2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryFinishedGoodsNetOfReserves_cba43c45-d89b-4f17-99fd-254a11634cc9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_InventoryFinishedGoodsNetOfReserves"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_InventoryNet_3d18843f-b977-4d81-bae2-c3a44851429b" xlink:to="loc_us-gaap_InventoryFinishedGoodsNetOfReserves_cba43c45-d89b-4f17-99fd-254a11634cc9" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.intlfcstone.com/role/IntangibleAssetsGrossandNetIntangibleAssetsbyMajorClassDetails" xlink:type="simple" xlink:href="intl-20230630.xsd#IntangibleAssetsGrossandNetIntangibleAssetsbyMajorClassDetails"/>
  <link:calculationLink xlink:role="http://www.intlfcstone.com/role/IntangibleAssetsGrossandNetIntangibleAssetsbyMajorClassDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_c588245a-b4d3-44d9-b6db-88cd5d71771c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedLicenseAgreements_d96cebf2-04be-41af-8ad5-2cc50fd9214f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IndefiniteLivedLicenseAgreements"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_c588245a-b4d3-44d9-b6db-88cd5d71771c" xlink:to="loc_us-gaap_IndefiniteLivedLicenseAgreements_d96cebf2-04be-41af-8ad5-2cc50fd9214f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_7c176e2a-697c-441d-b215-9e901cbad445" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_f46c39f0-6fb0-4e69-8e23-389b0d5c8eed" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_7c176e2a-697c-441d-b215-9e901cbad445" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_f46c39f0-6fb0-4e69-8e23-389b0d5c8eed" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsGrossExcludingGoodwill_b9621ed7-fe2f-4341-a60a-9406c66636f0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IntangibleAssetsGrossExcludingGoodwill"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_7c176e2a-697c-441d-b215-9e901cbad445" xlink:to="loc_us-gaap_IntangibleAssetsGrossExcludingGoodwill_b9621ed7-fe2f-4341-a60a-9406c66636f0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_175ffc7e-4fe1-408d-9491-589d01d76e40" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedComputerSoftwareGross_b909a932-f46e-4911-b0a1-eb593d290dfa" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CapitalizedComputerSoftwareGross"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet_175ffc7e-4fe1-408d-9491-589d01d76e40" xlink:to="loc_us-gaap_CapitalizedComputerSoftwareGross_b909a932-f46e-4911-b0a1-eb593d290dfa" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_4ac54db9-176b-4980-8c2b-200d39e64580" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet_175ffc7e-4fe1-408d-9491-589d01d76e40" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_4ac54db9-176b-4980-8c2b-200d39e64580" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.intlfcstone.com/role/IntangibleAssetsFiniteLivedIntangibleAssetsFutureAmortizationExpenseDetails" xlink:type="simple" xlink:href="intl-20230630.xsd#IntangibleAssetsFiniteLivedIntangibleAssetsFutureAmortizationExpenseDetails"/>
  <link:calculationLink xlink:role="http://www.intlfcstone.com/role/IntangibleAssetsFiniteLivedIntangibleAssetsFutureAmortizationExpenseDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_db8122b9-0288-445f-955e-e5b853e995e8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear_3e378735-aa92-4062-ad1b-6d6d24f17292" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet_db8122b9-0288-445f-955e-e5b853e995e8" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear_3e378735-aa92-4062-ad1b-6d6d24f17292" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths_d7f2f930-3bc6-44f6-a626-cd3a030c4c4e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet_db8122b9-0288-445f-955e-e5b853e995e8" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths_d7f2f930-3bc6-44f6-a626-cd3a030c4c4e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_2b42b13a-4bcf-477e-bc19-cae6f15bb959" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet_db8122b9-0288-445f-955e-e5b853e995e8" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_2b42b13a-4bcf-477e-bc19-cae6f15bb959" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_6857d6f6-9332-489f-8b9c-6bab78f8742c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet_db8122b9-0288-445f-955e-e5b853e995e8" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_6857d6f6-9332-489f-8b9c-6bab78f8742c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_180b770a-b80a-4a41-bd31-5eafc66222b0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet_db8122b9-0288-445f-955e-e5b853e995e8" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_180b770a-b80a-4a41-bd31-5eafc66222b0" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.intlfcstone.com/role/CreditFacilitiesCreditFacilitiesandFinancingBridgeCommitmentDetails" xlink:type="simple" xlink:href="intl-20230630.xsd#CreditFacilitiesCreditFacilitiesandFinancingBridgeCommitmentDetails"/>
  <link:calculationLink xlink:role="http://www.intlfcstone.com/role/CreditFacilitiesCreditFacilitiesandFinancingBridgeCommitmentDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_intl_AmountOutstandingOnCommittedCreditFacilities_3f9f766b-288d-470f-ab6f-9295471dc047" xlink:href="intl-20230630.xsd#intl_AmountOutstandingOnCommittedCreditFacilities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LinesOfCreditCurrent_0cd29226-8a91-4d38-9691-451009b26c41" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LinesOfCreditCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_intl_AmountOutstandingOnCommittedCreditFacilities_3f9f766b-288d-470f-ab6f-9295471dc047" xlink:to="loc_us-gaap_LinesOfCreditCurrent_0cd29226-8a91-4d38-9691-451009b26c41" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermLineOfCredit_729485b3-4a7f-4a79-bc0c-0aa7e4b8ad90" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongTermLineOfCredit"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_intl_AmountOutstandingOnCommittedCreditFacilities_3f9f766b-288d-470f-ab6f-9295471dc047" xlink:to="loc_us-gaap_LongTermLineOfCredit_729485b3-4a7f-4a79-bc0c-0aa7e4b8ad90" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtLongtermAndShorttermCombinedAmount_77fc5e36-3575-4262-be17-6614ab198a48" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtLongtermAndShorttermCombinedAmount"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotesPayableToBank_2baf5728-59dc-4d1d-81a5-765683dd664e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NotesPayableToBank"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DebtLongtermAndShorttermCombinedAmount_77fc5e36-3575-4262-be17-6614ab198a48" xlink:to="loc_us-gaap_NotesPayableToBank_2baf5728-59dc-4d1d-81a5-765683dd664e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotes_85ab5c6d-0916-4858-98f5-51d166937948" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SeniorNotes"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DebtLongtermAndShorttermCombinedAmount_77fc5e36-3575-4262-be17-6614ab198a48" xlink:to="loc_us-gaap_SeniorNotes_85ab5c6d-0916-4858-98f5-51d166937948" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_intl_AmountOutstandingOnCommittedCreditFacilities_fbe8a72a-3ddb-4c2e-9c6c-8b7c987e5ee7" xlink:href="intl-20230630.xsd#intl_AmountOutstandingOnCommittedCreditFacilities"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DebtLongtermAndShorttermCombinedAmount_77fc5e36-3575-4262-be17-6614ab198a48" xlink:to="loc_intl_AmountOutstandingOnCommittedCreditFacilities_fbe8a72a-3ddb-4c2e-9c6c-8b7c987e5ee7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_intl_LinesOfCreditUncommittedFacilities_c77ca01c-f566-4ac0-8e13-ba759d3e1b2f" xlink:href="intl-20230630.xsd#intl_LinesOfCreditUncommittedFacilities"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DebtLongtermAndShorttermCombinedAmount_77fc5e36-3575-4262-be17-6614ab198a48" xlink:to="loc_intl_LinesOfCreditUncommittedFacilities_c77ca01c-f566-4ac0-8e13-ba759d3e1b2f" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.intlfcstone.com/role/SecuritiesandCommodityFinancingTransactionsCollateralMaturitiesofGrossObligationsDetails" xlink:type="simple" xlink:href="intl-20230630.xsd#SecuritiesandCommodityFinancingTransactionsCollateralMaturitiesofGrossObligationsDetails"/>
  <link:calculationLink xlink:role="http://www.intlfcstone.com/role/SecuritiesandCommodityFinancingTransactionsCollateralMaturitiesofGrossObligationsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CollateralizedFinancings_621077fe-4e12-40ba-8fdb-aa40ea131eba" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CollateralizedFinancings"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseGross_80273045-a0ec-445d-b49f-81183b911e28" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseGross"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CollateralizedFinancings_621077fe-4e12-40ba-8fdb-aa40ea131eba" xlink:to="loc_us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseGross_80273045-a0ec-445d-b49f-81183b911e28" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuritiesLoaned_8d9bf70a-826b-42d5-aca3-6f5a855b33a0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SecuritiesLoaned"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CollateralizedFinancings_621077fe-4e12-40ba-8fdb-aa40ea131eba" xlink:to="loc_us-gaap_SecuritiesLoaned_8d9bf70a-826b-42d5-aca3-6f5a855b33a0" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.intlfcstone.com/role/SecuritiesandCommodityFinancingTransactionsNettingofSecuritiesPurchasedUnderAgreementsDetails" xlink:type="simple" xlink:href="intl-20230630.xsd#SecuritiesandCommodityFinancingTransactionsNettingofSecuritiesPurchasedUnderAgreementsDetails"/>
  <link:calculationLink xlink:role="http://www.intlfcstone.com/role/SecuritiesandCommodityFinancingTransactionsNettingofSecuritiesPurchasedUnderAgreementsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuritiesPurchasedUnderAgreementsToResell_d64e4e67-97f4-4796-87ed-acc2ceccb734" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SecuritiesPurchasedUnderAgreementsToResell"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuritiesPurchasedUnderAgreementsToResellGross_f5cb39fb-8260-4f61-97f4-a5220c9624cc" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SecuritiesPurchasedUnderAgreementsToResellGross"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_SecuritiesPurchasedUnderAgreementsToResell_d64e4e67-97f4-4796-87ed-acc2ceccb734" xlink:to="loc_us-gaap_SecuritiesPurchasedUnderAgreementsToResellGross_f5cb39fb-8260-4f61-97f4-a5220c9624cc" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuritiesPurchasedUnderAgreementsToResellLiability_efcf14fb-6054-43aa-83e9-354989920279" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SecuritiesPurchasedUnderAgreementsToResellLiability"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_SecuritiesPurchasedUnderAgreementsToResell_d64e4e67-97f4-4796-87ed-acc2ceccb734" xlink:to="loc_us-gaap_SecuritiesPurchasedUnderAgreementsToResellLiability_efcf14fb-6054-43aa-83e9-354989920279" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuritiesBorrowed_1569ee82-0001-4d79-b019-0d48e0bcee99" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SecuritiesBorrowed"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuritiesBorrowedGross_900fb369-082b-410e-956a-7af00f6f45bb" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SecuritiesBorrowedGross"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_SecuritiesBorrowed_1569ee82-0001-4d79-b019-0d48e0bcee99" xlink:to="loc_us-gaap_SecuritiesBorrowedGross_900fb369-082b-410e-956a-7af00f6f45bb" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuritiesSoldUnderAgreementsToRepurchase_b1fc6b58-f545-420e-be2f-6bd92fa4c3b7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SecuritiesSoldUnderAgreementsToRepurchase"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseGross_f95944e1-0d6b-4238-a6e7-f2b6b59cd756" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseGross"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_SecuritiesSoldUnderAgreementsToRepurchase_b1fc6b58-f545-420e-be2f-6bd92fa4c3b7" xlink:to="loc_us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseGross_f95944e1-0d6b-4238-a6e7-f2b6b59cd756" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseAsset_a7bf08f8-a21b-4863-accf-c1aef7dd0406" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseAsset"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_SecuritiesSoldUnderAgreementsToRepurchase_b1fc6b58-f545-420e-be2f-6bd92fa4c3b7" xlink:to="loc_us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseAsset_a7bf08f8-a21b-4863-accf-c1aef7dd0406" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuritiesLoaned_18b5a582-0416-4d07-9a69-2a111db8153c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SecuritiesLoaned"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuritiesLoanedGross_815bf2b2-075f-4df4-ad34-5aa16b7d4c87" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SecuritiesLoanedGross"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_SecuritiesLoaned_18b5a582-0416-4d07-9a69-2a111db8153c" xlink:to="loc_us-gaap_SecuritiesLoanedGross_815bf2b2-075f-4df4-ad34-5aa16b7d4c87" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.intlfcstone.com/role/OtherExpensesOtherExpensesBreakoutDetails" xlink:type="simple" xlink:href="intl-20230630.xsd#OtherExpensesOtherExpensesBreakoutDetails"/>
  <link:calculationLink xlink:role="http://www.intlfcstone.com/role/OtherExpensesOtherExpensesBreakoutDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNoninterestExpense_f5ba739b-d767-41f9-8c76-ed024dabe6ac" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherNoninterestExpense"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherExpenses_782cbd67-81fa-4800-bf13-c3bf4d5571bd" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherExpenses"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherNoninterestExpense_f5ba739b-d767-41f9-8c76-ed024dabe6ac" xlink:to="loc_us-gaap_OtherExpenses_782cbd67-81fa-4800-bf13-c3bf4d5571bd" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_intl_EmployeeRelatedExpenses_6e8c7a52-ffbd-41bf-991d-c1ecfdbf8bad" xlink:href="intl-20230630.xsd#intl_EmployeeRelatedExpenses"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherNoninterestExpense_f5ba739b-d767-41f9-8c76-ed024dabe6ac" xlink:to="loc_intl_EmployeeRelatedExpenses_6e8c7a52-ffbd-41bf-991d-c1ecfdbf8bad" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TaxesExcludingIncomeAndExciseTaxes_13501159-6d67-4a59-bdbc-7dbc7ab64bd8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TaxesExcludingIncomeAndExciseTaxes"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherNoninterestExpense_f5ba739b-d767-41f9-8c76-ed024dabe6ac" xlink:to="loc_us-gaap_TaxesExcludingIncomeAndExciseTaxes_13501159-6d67-4a59-bdbc-7dbc7ab64bd8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_intl_OtherDirectBusinessExpenses_a1e961b5-045d-413f-85cb-6f9613782f32" xlink:href="intl-20230630.xsd#intl_OtherDirectBusinessExpenses"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherNoninterestExpense_f5ba739b-d767-41f9-8c76-ed024dabe6ac" xlink:to="loc_intl_OtherDirectBusinessExpenses_a1e961b5-045d-413f-85cb-6f9613782f32" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_intl_DirectorAndPublicCompanyExpenses_dc60ce23-f4c8-4393-a3ad-57b7f44bed32" xlink:href="intl-20230630.xsd#intl_DirectorAndPublicCompanyExpenses"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherNoninterestExpense_f5ba739b-d767-41f9-8c76-ed024dabe6ac" xlink:to="loc_intl_DirectorAndPublicCompanyExpenses_dc60ce23-f4c8-4393-a3ad-57b7f44bed32" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_intl_MembershipExpense_cb0c6e40-d16e-4027-bc64-826a5f3213cd" xlink:href="intl-20230630.xsd#intl_MembershipExpense"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherNoninterestExpense_f5ba739b-d767-41f9-8c76-ed024dabe6ac" xlink:to="loc_intl_MembershipExpense_cb0c6e40-d16e-4027-bc64-826a5f3213cd" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeneralInsuranceExpense_bd76da45-54f0-44d0-97bd-1e4e31de404a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GeneralInsuranceExpense"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherNoninterestExpense_f5ba739b-d767-41f9-8c76-ed024dabe6ac" xlink:to="loc_us-gaap_GeneralInsuranceExpense_bd76da45-54f0-44d0-97bd-1e4e31de404a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_intl_OfficeExpenses_9d0e4055-5000-44d0-b7e8-536b5f319dfe" xlink:href="intl-20230630.xsd#intl_OfficeExpenses"/>
    <link:calculationArc order="8" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherNoninterestExpense_f5ba739b-d767-41f9-8c76-ed024dabe6ac" xlink:to="loc_intl_OfficeExpenses_9d0e4055-5000-44d0-b7e8-536b5f319dfe" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.intlfcstone.com/role/AcquisitionsCottonDistributorsIncDetails" xlink:type="simple" xlink:href="intl-20230630.xsd#AcquisitionsCottonDistributorsIncDetails"/>
  <link:calculationLink xlink:role="http://www.intlfcstone.com/role/AcquisitionsCottonDistributorsIncDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_intl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAssetsAcquired_579beae5-de00-48b2-ada3-ceee6ce17950" xlink:href="intl-20230630.xsd#intl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAssetsAcquired"/>
    <link:loc xlink:type="locator" xlink:label="loc_intl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedTangibleAssets_8bfe2fab-6502-4834-93c7-da0037922a08" xlink:href="intl-20230630.xsd#intl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedTangibleAssets"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_intl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAssetsAcquired_579beae5-de00-48b2-ada3-ceee6ce17950" xlink:to="loc_intl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedTangibleAssets_8bfe2fab-6502-4834-93c7-da0037922a08" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_intl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedTangibleLiabilities_9d2243f3-2e20-4306-9740-d0b5d0030723" xlink:href="intl-20230630.xsd#intl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedTangibleLiabilities"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_intl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAssetsAcquired_579beae5-de00-48b2-ada3-ceee6ce17950" xlink:to="loc_intl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedTangibleLiabilities_9d2243f3-2e20-4306-9740-d0b5d0030723" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_ed3bbce5-77e4-4c3d-ae63-a7c380b58cb4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_intl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAssetsAcquired_0cba3efe-e3d7-4ca0-af82-34d7c99df0c9" xlink:href="intl-20230630.xsd#intl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAssetsAcquired"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_ed3bbce5-77e4-4c3d-ae63-a7c380b58cb4" xlink:to="loc_intl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAssetsAcquired_0cba3efe-e3d7-4ca0-af82-34d7c99df0c9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_cebd91db-2f85-43f5-b6ad-3e091564d66f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_ed3bbce5-77e4-4c3d-ae63-a7c380b58cb4" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_cebd91db-2f85-43f5-b6ad-3e091564d66f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_intl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedTangibleLiabilities_33d9e361-3529-42fa-886a-25a5b0376467" xlink:href="intl-20230630.xsd#intl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedTangibleLiabilities"/>
    <link:loc xlink:type="locator" xlink:label="loc_intl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBrokerDealerPayableToOtherBrokerDealerAndClearingOrganization_da68508a-52a6-4ef1-807f-a4c377868806" xlink:href="intl-20230630.xsd#intl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBrokerDealerPayableToOtherBrokerDealerAndClearingOrganization"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_intl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedTangibleLiabilities_33d9e361-3529-42fa-886a-25a5b0376467" xlink:to="loc_intl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBrokerDealerPayableToOtherBrokerDealerAndClearingOrganization_da68508a-52a6-4ef1-807f-a4c377868806" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_intl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIncomeTaxesPayable_3c40ea68-d112-4682-a05d-91aac20dbaa5" xlink:href="intl-20230630.xsd#intl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIncomeTaxesPayable"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_intl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedTangibleLiabilities_33d9e361-3529-42fa-886a-25a5b0376467" xlink:to="loc_intl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIncomeTaxesPayable_3c40ea68-d112-4682-a05d-91aac20dbaa5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_intl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPayableToLendersUnderLoans_f6eeb6ef-2616-4782-bd5e-860b25692639" xlink:href="intl-20230630.xsd#intl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPayableToLendersUnderLoans"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_intl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedTangibleLiabilities_33d9e361-3529-42fa-886a-25a5b0376467" xlink:to="loc_intl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPayableToLendersUnderLoans_f6eeb6ef-2616-4782-bd5e-860b25692639" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_intl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccountsPayableAndOtherAccruedLiabilities_39b8da23-a35c-4f6a-981e-df4e35fe4d6c" xlink:href="intl-20230630.xsd#intl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccountsPayableAndOtherAccruedLiabilities"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_intl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedTangibleLiabilities_33d9e361-3529-42fa-886a-25a5b0376467" xlink:to="loc_intl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccountsPayableAndOtherAccruedLiabilities_39b8da23-a35c-4f6a-981e-df4e35fe4d6c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_intl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBrokerDealerPayableToCustomer_cf06a98a-3b6a-4625-905d-35eaf4642311" xlink:href="intl-20230630.xsd#intl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBrokerDealerPayableToCustomer"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_intl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedTangibleLiabilities_33d9e361-3529-42fa-886a-25a5b0376467" xlink:to="loc_intl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBrokerDealerPayableToCustomer_cf06a98a-3b6a-4625-905d-35eaf4642311" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_intl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFinancialInstrumentsSoldNotYetPurchasedAtFairValue_368306f7-2771-4d2c-9de6-1ad2afaf7469" xlink:href="intl-20230630.xsd#intl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFinancialInstrumentsSoldNotYetPurchasedAtFairValue"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_intl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedTangibleLiabilities_33d9e361-3529-42fa-886a-25a5b0376467" xlink:to="loc_intl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFinancialInstrumentsSoldNotYetPurchasedAtFairValue_368306f7-2771-4d2c-9de6-1ad2afaf7469" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_intl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedTangibleAssets_304d4a26-ada1-4262-a239-b48428636d24" xlink:href="intl-20230630.xsd#intl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedTangibleAssets"/>
    <link:loc xlink:type="locator" xlink:label="loc_intl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedReceivablesFromCustomers_1ae07655-60a7-4a67-b23b-856149ce2e11" xlink:href="intl-20230630.xsd#intl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedReceivablesFromCustomers"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_intl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedTangibleAssets_304d4a26-ada1-4262-a239-b48428636d24" xlink:to="loc_intl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedReceivablesFromCustomers_1ae07655-60a7-4a67-b23b-856149ce2e11" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_9a6736a7-385e-4075-ac11-48aecf92e9f1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_intl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedTangibleAssets_304d4a26-ada1-4262-a239-b48428636d24" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_9a6736a7-385e-4075-ac11-48aecf92e9f1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_831d4715-f6e5-4c54-bb37-d4ff18eff4da" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_intl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedTangibleAssets_304d4a26-ada1-4262-a239-b48428636d24" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_831d4715-f6e5-4c54-bb37-d4ff18eff4da" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_intl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredIncomeTaxesNet_b6db407a-d793-49ba-8574-ecb0b1172655" xlink:href="intl-20230630.xsd#intl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredIncomeTaxesNet"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_intl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedTangibleAssets_304d4a26-ada1-4262-a239-b48428636d24" xlink:to="loc_intl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredIncomeTaxesNet_b6db407a-d793-49ba-8574-ecb0b1172655" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFinancialAssets_39f749c9-700a-4e02-8956-8614eae6cc63" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFinancialAssets"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_intl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedTangibleAssets_304d4a26-ada1-4262-a239-b48428636d24" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFinancialAssets_39f749c9-700a-4e02-8956-8614eae6cc63" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_intl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherAssets_ca1704e1-6303-47e3-900a-11c32ef73786" xlink:href="intl-20230630.xsd#intl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherAssets"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_intl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedTangibleAssets_304d4a26-ada1-4262-a239-b48428636d24" xlink:to="loc_intl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherAssets_ca1704e1-6303-47e3-900a-11c32ef73786" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_intl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDepositsWithAndReceivablesFromBrokerDealersClearingOrganizationsAndCounterparties_b5b1994f-8d3f-402d-87f1-c5aa4c6967dc" xlink:href="intl-20230630.xsd#intl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDepositsWithAndReceivablesFromBrokerDealersClearingOrganizationsAndCounterparties"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_intl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedTangibleAssets_304d4a26-ada1-4262-a239-b48428636d24" xlink:to="loc_intl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDepositsWithAndReceivablesFromBrokerDealersClearingOrganizationsAndCounterparties_b5b1994f-8d3f-402d-87f1-c5aa4c6967dc" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory_a9f52e2e-1c47-4b86-bb1e-caa563bbe95e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory"/>
    <link:calculationArc order="8" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_intl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedTangibleAssets_304d4a26-ada1-4262-a239-b48428636d24" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory_a9f52e2e-1c47-4b86-bb1e-caa563bbe95e" xlink:type="arc"/>
  </link:calculationLink>
</link:linkbase>
