<?xml version="1.0" encoding="US-ASCII"?>
<!--XBRL Document Created with Wdesk from Workiva-->
<!-- -->
<link:linkbase xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd" 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">
  <link:roleRef roleURI="http://www.opco.com/role/CollateralizedTransactions" xlink:href="opy-20190331.xsd#CollateralizedTransactions" xlink:type="simple" />
  <link:roleRef roleURI="http://www.opco.com/role/CollateralizedTransactionsAdditionalInformationNarrativeDetails" xlink:href="opy-20190331.xsd#CollateralizedTransactionsAdditionalInformationNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.opco.com/role/CollateralizedTransactionsScheduleOfGrossAmountsAndOffsettingAmountsOfReverseRepurchaseAgreementsRepurchaseAgreementsSecuritiesBorrowedAndSecuritiesLendingTransactionsDetails" xlink:href="opy-20190331.xsd#CollateralizedTransactionsScheduleOfGrossAmountsAndOffsettingAmountsOfReverseRepurchaseAgreementsRepurchaseAgreementsSecuritiesBorrowedAndSecuritiesLendingTransactionsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.opco.com/role/CollateralizedTransactionsScheduleOfGrossAmountsAndOffsettingAmountsOfReverseRepurchaseAgreementsRepurchaseAgreementsSecuritiesBorrowedAndSecuritiesLendingTransactionsDetailsCalc2" xlink:href="opy-20190331.xsd#CollateralizedTransactionsScheduleOfGrossAmountsAndOffsettingAmountsOfReverseRepurchaseAgreementsRepurchaseAgreementsSecuritiesBorrowedAndSecuritiesLendingTransactionsDetailsCalc2" xlink:type="simple" />
  <link:roleRef roleURI="http://www.opco.com/role/CollateralizedTransactionsTables" xlink:href="opy-20190331.xsd#CollateralizedTransactionsTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.opco.com/role/CommitmentsAndContingencies" xlink:href="opy-20190331.xsd#CommitmentsAndContingencies" xlink:type="simple" />
  <link:roleRef roleURI="http://www.opco.com/role/CommitmentsAndContingenciesNarrativeDetails" xlink:href="opy-20190331.xsd#CommitmentsAndContingenciesNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.opco.com/role/CommitmentsAndContingenciesTables" xlink:href="opy-20190331.xsd#CommitmentsAndContingenciesTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.opco.com/role/ConsolidatedBalanceSheets" xlink:href="opy-20190331.xsd#ConsolidatedBalanceSheets" xlink:type="simple" />
  <link:roleRef roleURI="http://www.opco.com/role/ConsolidatedBalanceSheetsParenthetical" xlink:href="opy-20190331.xsd#ConsolidatedBalanceSheetsParenthetical" xlink:type="simple" />
  <link:roleRef roleURI="http://www.opco.com/role/ConsolidatedStatementsOfCashFlows" xlink:href="opy-20190331.xsd#ConsolidatedStatementsOfCashFlows" xlink:type="simple" />
  <link:roleRef roleURI="http://www.opco.com/role/ConsolidatedStatementsOfChangesInStockholdersEquity" xlink:href="opy-20190331.xsd#ConsolidatedStatementsOfChangesInStockholdersEquity" xlink:type="simple" />
  <link:roleRef roleURI="http://www.opco.com/role/ConsolidatedStatementsOfChangesInStockholdersEquityParenthetical" xlink:href="opy-20190331.xsd#ConsolidatedStatementsOfChangesInStockholdersEquityParenthetical" xlink:type="simple" />
  <link:roleRef roleURI="http://www.opco.com/role/ConsolidatedStatementsOfComprehensiveIncomeLoss" xlink:href="opy-20190331.xsd#ConsolidatedStatementsOfComprehensiveIncomeLoss" xlink:type="simple" />
  <link:roleRef roleURI="http://www.opco.com/role/ConsolidatedStatementsOfOperations" xlink:href="opy-20190331.xsd#ConsolidatedStatementsOfOperations" xlink:type="simple" />
  <link:roleRef roleURI="http://www.opco.com/role/DocumentAndEntityInformation" xlink:href="opy-20190331.xsd#DocumentAndEntityInformation" xlink:type="simple" />
  <link:roleRef roleURI="http://www.opco.com/role/EarningsPerShare" xlink:href="opy-20190331.xsd#EarningsPerShare" xlink:type="simple" />
  <link:roleRef roleURI="http://www.opco.com/role/EarningsPerShareSummaryOfEarningsPerShareDetails" xlink:href="opy-20190331.xsd#EarningsPerShareSummaryOfEarningsPerShareDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.opco.com/role/EarningsPerShareSummaryOfEarningsPerShareNarrativeDetails" xlink:href="opy-20190331.xsd#EarningsPerShareSummaryOfEarningsPerShareNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.opco.com/role/EarningsPerShareTables" xlink:href="opy-20190331.xsd#EarningsPerShareTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.opco.com/role/FairValueMeasurements" xlink:href="opy-20190331.xsd#FairValueMeasurements" xlink:type="simple" />
  <link:roleRef roleURI="http://www.opco.com/role/FairValueMeasurementsAdditionalInformationNarrativeDetails" xlink:href="opy-20190331.xsd#FairValueMeasurementsAdditionalInformationNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.opco.com/role/FairValueMeasurementsAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails" xlink:href="opy-20190331.xsd#FairValueMeasurementsAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.opco.com/role/FairValueMeasurementsAssetsAndLiabilitiesNotMeasuredAtFairValueOnRecurringBasisDetails" xlink:href="opy-20190331.xsd#FairValueMeasurementsAssetsAndLiabilitiesNotMeasuredAtFairValueOnRecurringBasisDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.opco.com/role/FairValueMeasurementsChangesInLevel3AssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails" xlink:href="opy-20190331.xsd#FairValueMeasurementsChangesInLevel3AssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.opco.com/role/FairValueMeasurementsFairValueAmountsOfDerivativeInstrumentsAndTheirEffectOnStatementOfOperationsDetails" xlink:href="opy-20190331.xsd#FairValueMeasurementsFairValueAmountsOfDerivativeInstrumentsAndTheirEffectOnStatementOfOperationsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.opco.com/role/FairValueMeasurementsInvestmentsInCompanySponsoredFundsDetails" xlink:href="opy-20190331.xsd#FairValueMeasurementsInvestmentsInCompanySponsoredFundsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.opco.com/role/FairValueMeasurementsNotionalAmountsAndFairValuesOfDerivativesByProductDetails" xlink:href="opy-20190331.xsd#FairValueMeasurementsNotionalAmountsAndFairValuesOfDerivativesByProductDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.opco.com/role/FairValueMeasurementsQuantitativeInformationAboutLevel3FairValueMeasurementsDetails" xlink:href="opy-20190331.xsd#FairValueMeasurementsQuantitativeInformationAboutLevel3FairValueMeasurementsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.opco.com/role/FairValueMeasurementsSecuritiesOwnedAndSecuritiesSoldButNotYetPurchasedAtFairValueDetails" xlink:href="opy-20190331.xsd#FairValueMeasurementsSecuritiesOwnedAndSecuritiesSoldButNotYetPurchasedAtFairValueDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.opco.com/role/FairValueMeasurementsTables" xlink:href="opy-20190331.xsd#FairValueMeasurementsTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.opco.com/role/Leases" xlink:href="opy-20190331.xsd#Leases" xlink:type="simple" />
  <link:roleRef roleURI="http://www.opco.com/role/LeasesAdditionalInformationDetails" xlink:href="opy-20190331.xsd#LeasesAdditionalInformationDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.opco.com/role/LeasesScheduleOfLeaseCostDetails" xlink:href="opy-20190331.xsd#LeasesScheduleOfLeaseCostDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.opco.com/role/LeasesScheduleOfMaturitiesOfLeasePaymentsDetails" xlink:href="opy-20190331.xsd#LeasesScheduleOfMaturitiesOfLeasePaymentsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.opco.com/role/LeasesScheduleOfMaturitiesOfLeasePaymentsDetailsCalc2" xlink:href="opy-20190331.xsd#LeasesScheduleOfMaturitiesOfLeasePaymentsDetailsCalc2" xlink:type="simple" />
  <link:roleRef roleURI="http://www.opco.com/role/LeasesTables" xlink:href="opy-20190331.xsd#LeasesTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.opco.com/role/LongTermDebt" xlink:href="opy-20190331.xsd#LongTermDebt" xlink:type="simple" />
  <link:roleRef roleURI="http://www.opco.com/role/LongTermDebtAdditionalInformationNarrativeDetails" xlink:href="opy-20190331.xsd#LongTermDebtAdditionalInformationNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.opco.com/role/LongTermDebtScheduleOfLongTermDebtDetails" xlink:href="opy-20190331.xsd#LongTermDebtScheduleOfLongTermDebtDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.opco.com/role/LongTermDebtTables" xlink:href="opy-20190331.xsd#LongTermDebtTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.opco.com/role/NewAccountingPronouncements" xlink:href="opy-20190331.xsd#NewAccountingPronouncements" xlink:type="simple" />
  <link:roleRef roleURI="http://www.opco.com/role/NewAccountingPronouncementsPolicies" xlink:href="opy-20190331.xsd#NewAccountingPronouncementsPolicies" xlink:type="simple" />
  <link:roleRef roleURI="http://www.opco.com/role/Organization" xlink:href="opy-20190331.xsd#Organization" xlink:type="simple" />
  <link:roleRef roleURI="http://www.opco.com/role/OrganizationAdditionalInformationNarrativeDetails" xlink:href="opy-20190331.xsd#OrganizationAdditionalInformationNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.opco.com/role/ReceivableFromAndPayableToBrokersDealersAndClearingOrganizations" xlink:href="opy-20190331.xsd#ReceivableFromAndPayableToBrokersDealersAndClearingOrganizations" xlink:type="simple" />
  <link:roleRef roleURI="http://www.opco.com/role/ReceivableFromAndPayableToBrokersDealersAndClearingOrganizationsDetails" xlink:href="opy-20190331.xsd#ReceivableFromAndPayableToBrokersDealersAndClearingOrganizationsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.opco.com/role/ReceivableFromAndPayableToBrokersDealersAndClearingOrganizationsTables" xlink:href="opy-20190331.xsd#ReceivableFromAndPayableToBrokersDealersAndClearingOrganizationsTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.opco.com/role/RegulatoryRequirements" xlink:href="opy-20190331.xsd#RegulatoryRequirements" xlink:type="simple" />
  <link:roleRef roleURI="http://www.opco.com/role/RegulatoryRequirementsAdditionalInformationNarrativeDetails" xlink:href="opy-20190331.xsd#RegulatoryRequirementsAdditionalInformationNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.opco.com/role/RevenuesFromContractsWithCustomers" xlink:href="opy-20190331.xsd#RevenuesFromContractsWithCustomers" xlink:type="simple" />
  <link:roleRef roleURI="http://www.opco.com/role/RevenuesFromContractsWithCustomersContractAssetsAndLiabilitiesDetails" xlink:href="opy-20190331.xsd#RevenuesFromContractsWithCustomersContractAssetsAndLiabilitiesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.opco.com/role/RevenuesFromContractsWithCustomersDisaggregationOfRevenueDetails" xlink:href="opy-20190331.xsd#RevenuesFromContractsWithCustomersDisaggregationOfRevenueDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.opco.com/role/RevenuesFromContractsWithCustomersTables" xlink:href="opy-20190331.xsd#RevenuesFromContractsWithCustomersTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.opco.com/role/SegmentInformation" xlink:href="opy-20190331.xsd#SegmentInformation" xlink:type="simple" />
  <link:roleRef roleURI="http://www.opco.com/role/SegmentInformationReportedRevenueAndProfitBeforeIncomeTaxesDetails" xlink:href="opy-20190331.xsd#SegmentInformationReportedRevenueAndProfitBeforeIncomeTaxesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.opco.com/role/SegmentInformationRevenueClassifiedByMajorGeographicAreasDetails" xlink:href="opy-20190331.xsd#SegmentInformationRevenueClassifiedByMajorGeographicAreasDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.opco.com/role/SegmentInformationTables" xlink:href="opy-20190331.xsd#SegmentInformationTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.opco.com/role/ShareCapital" xlink:href="opy-20190331.xsd#ShareCapital" xlink:type="simple" />
  <link:roleRef roleURI="http://www.opco.com/role/ShareCapitalAdditionalInformationNarrativeDetails" xlink:href="opy-20190331.xsd#ShareCapitalAdditionalInformationNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.opco.com/role/ShareCapitalChangesInNumberOfSharesOfClassStockOutstandingDetails" xlink:href="opy-20190331.xsd#ShareCapitalChangesInNumberOfSharesOfClassStockOutstandingDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.opco.com/role/ShareCapitalTables" xlink:href="opy-20190331.xsd#ShareCapitalTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.opco.com/role/SubsequentEvents" xlink:href="opy-20190331.xsd#SubsequentEvents" xlink:type="simple" />
  <link:roleRef roleURI="http://www.opco.com/role/SubsequentEventsAdditionalInformationNarrativeDetails" xlink:href="opy-20190331.xsd#SubsequentEventsAdditionalInformationNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.opco.com/role/SupplementalGuarantorCondensedConsolidatedFinancialStatementsAdditionalInformationNarrativeDetails" xlink:href="opy-20190331.xsd#SupplementalGuarantorCondensedConsolidatedFinancialStatementsAdditionalInformationNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.opco.com/role/SupplementalGuarantorCondensedConsolidatedFinancialStatementsCondensedConsolidatingBalanceSheetDetails" xlink:href="opy-20190331.xsd#SupplementalGuarantorCondensedConsolidatedFinancialStatementsCondensedConsolidatingBalanceSheetDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.opco.com/role/SupplementalGuarantorCondensedConsolidatedFinancialStatementsCondensedConsolidatingBalanceSheetDetailsCalc2" xlink:href="opy-20190331.xsd#SupplementalGuarantorCondensedConsolidatedFinancialStatementsCondensedConsolidatingBalanceSheetDetailsCalc2" xlink:type="simple" />
  <link:roleRef roleURI="http://www.opco.com/role/SupplementalGuarantorCondensedConsolidatedFinancialStatementsCondensedConsolidatingStatementOfCashFlowsDetails" xlink:href="opy-20190331.xsd#SupplementalGuarantorCondensedConsolidatedFinancialStatementsCondensedConsolidatingStatementOfCashFlowsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.opco.com/role/SupplementalGuarantorCondensedConsolidatedFinancialStatementsCondensedConsolidatingStatementOfOperationsDetails" xlink:href="opy-20190331.xsd#SupplementalGuarantorCondensedConsolidatedFinancialStatementsCondensedConsolidatingStatementOfOperationsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.opco.com/role/SupplementalGuarantorConsolidatedFinancialStatements" xlink:href="opy-20190331.xsd#SupplementalGuarantorConsolidatedFinancialStatements" xlink:type="simple" />
  <link:roleRef roleURI="http://www.opco.com/role/SupplementalGuarantorConsolidatedFinancialStatementsTables" xlink:href="opy-20190331.xsd#SupplementalGuarantorConsolidatedFinancialStatementsTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.opco.com/role/VariableInterestEntities" xlink:href="opy-20190331.xsd#VariableInterestEntities" xlink:type="simple" />
  <link:roleRef roleURI="http://www.opco.com/role/VariableInterestEntitiesDetails" xlink:href="opy-20190331.xsd#VariableInterestEntitiesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.opco.com/role/VariableInterestEntitiesTables" xlink:href="opy-20190331.xsd#VariableInterestEntitiesTables" xlink:type="simple" />
  <link:calculationLink xlink:role="http://www.opco.com/role/CollateralizedTransactions" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.opco.com/role/CollateralizedTransactionsAdditionalInformationNarrativeDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.opco.com/role/CollateralizedTransactionsScheduleOfGrossAmountsAndOffsettingAmountsOfReverseRepurchaseAgreementsRepurchaseAgreementsSecuritiesBorrowedAndSecuritiesLendingTransactionsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection" xlink:label="loc_us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_48e30d6d-66b7-d920-86c4-8caa4575ef60" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseCollateralRightToReclaimSecurities" xlink:label="loc_us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseCollateralRightToReclaimSecurities_e3efcf39-65a9-93a1-29b3-979e57017d27" xlink:type="locator" />
    <link:calculationArc order="1" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_48e30d6d-66b7-d920-86c4-8caa4575ef60" xlink:to="loc_us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseCollateralRightToReclaimSecurities_e3efcf39-65a9-93a1-29b3-979e57017d27" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseCollateralRightToReclaimCash" xlink:label="loc_us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseCollateralRightToReclaimCash_a3e1fea4-4798-bb52-d6a0-a22f86f37824" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_48e30d6d-66b7-d920-86c4-8caa4575ef60" xlink:to="loc_us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseCollateralRightToReclaimCash_a3e1fea4-4798-bb52-d6a0-a22f86f37824" xlink:type="arc" />
    <link:loc xlink:href="opy-20190331.xsd#opy_SecuritiesSoldunderAgreementstoRepurchaseAmountNotOffsetAgainstCollateral" xlink:label="loc_opy_SecuritiesSoldunderAgreementstoRepurchaseAmountNotOffsetAgainstCollateral_1ded7169-5cdd-eb6b-cdb2-ed6463238f9a" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_48e30d6d-66b7-d920-86c4-8caa4575ef60" xlink:to="loc_opy_SecuritiesSoldunderAgreementstoRepurchaseAmountNotOffsetAgainstCollateral_1ded7169-5cdd-eb6b-cdb2-ed6463238f9a" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseGross" xlink:label="loc_us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseGross_c0a6fc4c-885f-a12e-f10a-8a03a0ee6c86" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_opy_SecuritiesSoldunderAgreementstoRepurchaseAmountNotOffsetAgainstCollateral_1ded7169-5cdd-eb6b-cdb2-ed6463238f9a" xlink:to="loc_us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseGross_c0a6fc4c-885f-a12e-f10a-8a03a0ee6c86" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseAsset" xlink:label="loc_us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseAsset_f88b5395-4dc2-9cce-f356-54683c5f9d82" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_opy_SecuritiesSoldunderAgreementstoRepurchaseAmountNotOffsetAgainstCollateral_1ded7169-5cdd-eb6b-cdb2-ed6463238f9a" xlink:to="loc_us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseAsset_f88b5395-4dc2-9cce-f356-54683c5f9d82" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection" xlink:label="loc_us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_8d82ec5f-921a-0be1-c4a1-720d469a4863" xlink:type="locator" />
    <link:loc xlink:href="opy-20190331.xsd#opy_DerivativeAssetSecuritiesPurchasedunderAgreementtoResellSecuritiesBorrowedNotOffsetAgainstCollateral" xlink:label="loc_opy_DerivativeAssetSecuritiesPurchasedunderAgreementtoResellSecuritiesBorrowedNotOffsetAgainstCollateral_39fd7a24-225d-778e-da03-ed6462ea5692" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_8d82ec5f-921a-0be1-c4a1-720d469a4863" xlink:to="loc_opy_DerivativeAssetSecuritiesPurchasedunderAgreementtoResellSecuritiesBorrowedNotOffsetAgainstCollateral_39fd7a24-225d-778e-da03-ed6462ea5692" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedGross" xlink:label="loc_us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedGross_6027f785-2ed7-7815-a75d-f842909f85c6" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_opy_DerivativeAssetSecuritiesPurchasedunderAgreementtoResellSecuritiesBorrowedNotOffsetAgainstCollateral_39fd7a24-225d-778e-da03-ed6462ea5692" xlink:to="loc_us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedGross_6027f785-2ed7-7815-a75d-f842909f85c6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SecuritiesPurchasedUnderAgreementsToResellGross" xlink:label="loc_us-gaap_SecuritiesPurchasedUnderAgreementsToResellGross_4db4642c-56d5-9093-039a-dd23d291ea49" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedGross_6027f785-2ed7-7815-a75d-f842909f85c6" xlink:to="loc_us-gaap_SecuritiesPurchasedUnderAgreementsToResellGross_4db4642c-56d5-9093-039a-dd23d291ea49" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SecuritiesBorrowedGross" xlink:label="loc_us-gaap_SecuritiesBorrowedGross_8f5697e0-d088-85d3-38e4-e8e1dcb6ae74" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedGross_6027f785-2ed7-7815-a75d-f842909f85c6" xlink:to="loc_us-gaap_SecuritiesBorrowedGross_8f5697e0-d088-85d3-38e4-e8e1dcb6ae74" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedLiability" xlink:label="loc_us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedLiability_33ef9fb8-8419-d8e3-baf1-04c152a07267" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_opy_DerivativeAssetSecuritiesPurchasedunderAgreementtoResellSecuritiesBorrowedNotOffsetAgainstCollateral_39fd7a24-225d-778e-da03-ed6462ea5692" xlink:to="loc_us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedLiability_33ef9fb8-8419-d8e3-baf1-04c152a07267" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SecuritiesPurchasedUnderAgreementsToResellLiability" xlink:label="loc_us-gaap_SecuritiesPurchasedUnderAgreementsToResellLiability_5fbc3484-4155-9a34-5fdb-50fdeda818a6" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedLiability_33ef9fb8-8419-d8e3-baf1-04c152a07267" xlink:to="loc_us-gaap_SecuritiesPurchasedUnderAgreementsToResellLiability_5fbc3484-4155-9a34-5fdb-50fdeda818a6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SecuritiesBorrowedLiability" xlink:label="loc_us-gaap_SecuritiesBorrowedLiability_8d10ce48-8c84-2c86-117e-b9320bd68a8a" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedLiability_33ef9fb8-8419-d8e3-baf1-04c152a07267" xlink:to="loc_us-gaap_SecuritiesBorrowedLiability_8d10ce48-8c84-2c86-117e-b9320bd68a8a" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedCollateralObligationToReturnSecurities" xlink:label="loc_us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedCollateralObligationToReturnSecurities_be9e9cdd-7a08-6f11-2d7c-b1b1e678a7ff" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_8d82ec5f-921a-0be1-c4a1-720d469a4863" xlink:to="loc_us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedCollateralObligationToReturnSecurities_be9e9cdd-7a08-6f11-2d7c-b1b1e678a7ff" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SecuritiesPurchasedUnderAgreementsToResellCollateralObligationToReturnSecurities" xlink:label="loc_us-gaap_SecuritiesPurchasedUnderAgreementsToResellCollateralObligationToReturnSecurities_5c923dd4-92c1-abd9-43ce-25505ed4aea1" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedCollateralObligationToReturnSecurities_be9e9cdd-7a08-6f11-2d7c-b1b1e678a7ff" xlink:to="loc_us-gaap_SecuritiesPurchasedUnderAgreementsToResellCollateralObligationToReturnSecurities_5c923dd4-92c1-abd9-43ce-25505ed4aea1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SecuritiesBorrowedCollateralObligationToReturnSecurities" xlink:label="loc_us-gaap_SecuritiesBorrowedCollateralObligationToReturnSecurities_2fd047fa-1a38-3ce2-bc34-8f0cd0e160ed" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedCollateralObligationToReturnSecurities_be9e9cdd-7a08-6f11-2d7c-b1b1e678a7ff" xlink:to="loc_us-gaap_SecuritiesBorrowedCollateralObligationToReturnSecurities_2fd047fa-1a38-3ce2-bc34-8f0cd0e160ed" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedCollateralObligationToReturnCash" xlink:label="loc_us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedCollateralObligationToReturnCash_271188c6-9195-9399-f154-67156948da88" xlink:type="locator" />
    <link:calculationArc order="3" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_8d82ec5f-921a-0be1-c4a1-720d469a4863" xlink:to="loc_us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedCollateralObligationToReturnCash_271188c6-9195-9399-f154-67156948da88" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SecuritiesPurchasedUnderAgreementsToResellCollateralObligationToReturnCash" xlink:label="loc_us-gaap_SecuritiesPurchasedUnderAgreementsToResellCollateralObligationToReturnCash_9e4fe698-c14c-bf27-cbbd-898a1c63df79" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedCollateralObligationToReturnCash_271188c6-9195-9399-f154-67156948da88" xlink:to="loc_us-gaap_SecuritiesPurchasedUnderAgreementsToResellCollateralObligationToReturnCash_9e4fe698-c14c-bf27-cbbd-898a1c63df79" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SecuritiesBorrowedCollateralObligationToReturnCash" xlink:label="loc_us-gaap_SecuritiesBorrowedCollateralObligationToReturnCash_45c2d7d2-0e1a-0ffe-4184-eef26d7f1563" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedCollateralObligationToReturnCash_271188c6-9195-9399-f154-67156948da88" xlink:to="loc_us-gaap_SecuritiesBorrowedCollateralObligationToReturnCash_45c2d7d2-0e1a-0ffe-4184-eef26d7f1563" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SecuritiesPurchasedUnderAgreementsToResellOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection" xlink:label="loc_us-gaap_SecuritiesPurchasedUnderAgreementsToResellOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_399f61d1-a0fa-3dd4-9a5a-651219950d71" xlink:type="locator" />
    <link:loc xlink:href="opy-20190331.xsd#opy_SecuritiesPurchasedunderAgreementtoResellAmountNotOffsetAgainstCollateral" xlink:label="loc_opy_SecuritiesPurchasedunderAgreementtoResellAmountNotOffsetAgainstCollateral_893fa27e-190e-7e66-562f-ed64627cf517" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_SecuritiesPurchasedUnderAgreementsToResellOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_399f61d1-a0fa-3dd4-9a5a-651219950d71" xlink:to="loc_opy_SecuritiesPurchasedunderAgreementtoResellAmountNotOffsetAgainstCollateral_893fa27e-190e-7e66-562f-ed64627cf517" xlink:type="arc" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_opy_SecuritiesPurchasedunderAgreementtoResellAmountNotOffsetAgainstCollateral_893fa27e-190e-7e66-562f-ed64627cf517" xlink:to="loc_us-gaap_SecuritiesPurchasedUnderAgreementsToResellGross_4db4642c-56d5-9093-039a-dd23d291ea49" xlink:type="arc" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_opy_SecuritiesPurchasedunderAgreementtoResellAmountNotOffsetAgainstCollateral_893fa27e-190e-7e66-562f-ed64627cf517" xlink:to="loc_us-gaap_SecuritiesPurchasedUnderAgreementsToResellLiability_5fbc3484-4155-9a34-5fdb-50fdeda818a6" xlink:type="arc" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_SecuritiesPurchasedUnderAgreementsToResellOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_399f61d1-a0fa-3dd4-9a5a-651219950d71" xlink:to="loc_us-gaap_SecuritiesPurchasedUnderAgreementsToResellCollateralObligationToReturnSecurities_5c923dd4-92c1-abd9-43ce-25505ed4aea1" xlink:type="arc" />
    <link:calculationArc order="3" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_SecuritiesPurchasedUnderAgreementsToResellOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_399f61d1-a0fa-3dd4-9a5a-651219950d71" xlink:to="loc_us-gaap_SecuritiesPurchasedUnderAgreementsToResellCollateralObligationToReturnCash_9e4fe698-c14c-bf27-cbbd-898a1c63df79" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SecuritiesBorrowedOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection" xlink:label="loc_us-gaap_SecuritiesBorrowedOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_2f47f23e-b7ef-16a8-1fd5-cdf021116282" xlink:type="locator" />
    <link:loc xlink:href="opy-20190331.xsd#opy_SecuritiesBorrowedAmountNotOffsetAgainstCollateral" xlink:label="loc_opy_SecuritiesBorrowedAmountNotOffsetAgainstCollateral_c96f2dc2-b03e-8c93-a864-ed64634b8c34" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_SecuritiesBorrowedOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_2f47f23e-b7ef-16a8-1fd5-cdf021116282" xlink:to="loc_opy_SecuritiesBorrowedAmountNotOffsetAgainstCollateral_c96f2dc2-b03e-8c93-a864-ed64634b8c34" xlink:type="arc" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_opy_SecuritiesBorrowedAmountNotOffsetAgainstCollateral_c96f2dc2-b03e-8c93-a864-ed64634b8c34" xlink:to="loc_us-gaap_SecuritiesBorrowedGross_8f5697e0-d088-85d3-38e4-e8e1dcb6ae74" xlink:type="arc" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_opy_SecuritiesBorrowedAmountNotOffsetAgainstCollateral_c96f2dc2-b03e-8c93-a864-ed64634b8c34" xlink:to="loc_us-gaap_SecuritiesBorrowedLiability_8d10ce48-8c84-2c86-117e-b9320bd68a8a" xlink:type="arc" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_SecuritiesBorrowedOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_2f47f23e-b7ef-16a8-1fd5-cdf021116282" xlink:to="loc_us-gaap_SecuritiesBorrowedCollateralObligationToReturnSecurities_2fd047fa-1a38-3ce2-bc34-8f0cd0e160ed" xlink:type="arc" />
    <link:calculationArc order="3" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_SecuritiesBorrowedOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_2f47f23e-b7ef-16a8-1fd5-cdf021116282" xlink:to="loc_us-gaap_SecuritiesBorrowedCollateralObligationToReturnCash_45c2d7d2-0e1a-0ffe-4184-eef26d7f1563" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection" xlink:label="loc_us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_e6dfd44b-26bf-944e-3c19-29d4953277e8" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedCollateralRightToReclaimSecurities" xlink:label="loc_us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedCollateralRightToReclaimSecurities_b887c708-d23a-b202-b698-04647a0ac2e3" xlink:type="locator" />
    <link:calculationArc order="1" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_e6dfd44b-26bf-944e-3c19-29d4953277e8" xlink:to="loc_us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedCollateralRightToReclaimSecurities_b887c708-d23a-b202-b698-04647a0ac2e3" xlink:type="arc" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedCollateralRightToReclaimSecurities_b887c708-d23a-b202-b698-04647a0ac2e3" xlink:to="loc_us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseCollateralRightToReclaimSecurities_e3efcf39-65a9-93a1-29b3-979e57017d27" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SecuritiesLoanedCollateralRightToReclaimSecurities" xlink:label="loc_us-gaap_SecuritiesLoanedCollateralRightToReclaimSecurities_2ba834e6-ac7f-8ca9-f45a-ea9b5f663ee1" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedCollateralRightToReclaimSecurities_b887c708-d23a-b202-b698-04647a0ac2e3" xlink:to="loc_us-gaap_SecuritiesLoanedCollateralRightToReclaimSecurities_2ba834e6-ac7f-8ca9-f45a-ea9b5f663ee1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedCollateralRightToReclaimCash" xlink:label="loc_us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedCollateralRightToReclaimCash_a117283c-6a25-a297-e5b4-f99cbaae787f" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_e6dfd44b-26bf-944e-3c19-29d4953277e8" xlink:to="loc_us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedCollateralRightToReclaimCash_a117283c-6a25-a297-e5b4-f99cbaae787f" xlink:type="arc" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedCollateralRightToReclaimCash_a117283c-6a25-a297-e5b4-f99cbaae787f" xlink:to="loc_us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseCollateralRightToReclaimCash_a3e1fea4-4798-bb52-d6a0-a22f86f37824" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SecuritiesLoanedCollateralRightToReclaimCash" xlink:label="loc_us-gaap_SecuritiesLoanedCollateralRightToReclaimCash_ce462594-d29b-8707-8d06-076a11ba8c68" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedCollateralRightToReclaimCash_a117283c-6a25-a297-e5b4-f99cbaae787f" xlink:to="loc_us-gaap_SecuritiesLoanedCollateralRightToReclaimCash_ce462594-d29b-8707-8d06-076a11ba8c68" xlink:type="arc" />
    <link:loc xlink:href="opy-20190331.xsd#opy_DerivativeLiabilitySecuritiesSoldunderAgreementstoResellSecuritiesLoanedAmountNotOffsetAgainstCollateral" xlink:label="loc_opy_DerivativeLiabilitySecuritiesSoldunderAgreementstoResellSecuritiesLoanedAmountNotOffsetAgainstCollateral_e3f02f8b-1d2c-7516-e086-ed6462c8c1c1" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_e6dfd44b-26bf-944e-3c19-29d4953277e8" xlink:to="loc_opy_DerivativeLiabilitySecuritiesSoldunderAgreementstoResellSecuritiesLoanedAmountNotOffsetAgainstCollateral_e3f02f8b-1d2c-7516-e086-ed6462c8c1c1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedGross" xlink:label="loc_us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedGross_dcdfbf18-916b-bbbb-c1ac-04b415341b81" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_opy_DerivativeLiabilitySecuritiesSoldunderAgreementstoResellSecuritiesLoanedAmountNotOffsetAgainstCollateral_e3f02f8b-1d2c-7516-e086-ed6462c8c1c1" xlink:to="loc_us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedGross_dcdfbf18-916b-bbbb-c1ac-04b415341b81" xlink:type="arc" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedGross_dcdfbf18-916b-bbbb-c1ac-04b415341b81" xlink:to="loc_us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseGross_c0a6fc4c-885f-a12e-f10a-8a03a0ee6c86" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SecuritiesLoanedGross" xlink:label="loc_us-gaap_SecuritiesLoanedGross_450aeb3c-2478-c606-22ff-81f62572fd20" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedGross_dcdfbf18-916b-bbbb-c1ac-04b415341b81" xlink:to="loc_us-gaap_SecuritiesLoanedGross_450aeb3c-2478-c606-22ff-81f62572fd20" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedAsset" xlink:label="loc_us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedAsset_29523279-8ca4-4910-4c80-df02cedbeb27" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_opy_DerivativeLiabilitySecuritiesSoldunderAgreementstoResellSecuritiesLoanedAmountNotOffsetAgainstCollateral_e3f02f8b-1d2c-7516-e086-ed6462c8c1c1" xlink:to="loc_us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedAsset_29523279-8ca4-4910-4c80-df02cedbeb27" xlink:type="arc" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedAsset_29523279-8ca4-4910-4c80-df02cedbeb27" xlink:to="loc_us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseAsset_f88b5395-4dc2-9cce-f356-54683c5f9d82" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SecuritiesLoanedAsset" xlink:label="loc_us-gaap_SecuritiesLoanedAsset_870eced1-ece4-579b-5805-cb2c28df3a97" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedAsset_29523279-8ca4-4910-4c80-df02cedbeb27" xlink:to="loc_us-gaap_SecuritiesLoanedAsset_870eced1-ece4-579b-5805-cb2c28df3a97" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SecuritiesLoanedOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection" xlink:label="loc_us-gaap_SecuritiesLoanedOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_87aba377-00e3-bf08-225d-4ba8bb3602d7" xlink:type="locator" />
    <link:calculationArc order="1" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_SecuritiesLoanedOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_87aba377-00e3-bf08-225d-4ba8bb3602d7" xlink:to="loc_us-gaap_SecuritiesLoanedCollateralRightToReclaimSecurities_2ba834e6-ac7f-8ca9-f45a-ea9b5f663ee1" xlink:type="arc" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_SecuritiesLoanedOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_87aba377-00e3-bf08-225d-4ba8bb3602d7" xlink:to="loc_us-gaap_SecuritiesLoanedCollateralRightToReclaimCash_ce462594-d29b-8707-8d06-076a11ba8c68" xlink:type="arc" />
    <link:loc xlink:href="opy-20190331.xsd#opy_SecuritiesLoanedAmountNotOffsetAgainstCollateral" xlink:label="loc_opy_SecuritiesLoanedAmountNotOffsetAgainstCollateral_733fe393-d478-f1ae-8653-ed64631d60e1" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_SecuritiesLoanedOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_87aba377-00e3-bf08-225d-4ba8bb3602d7" xlink:to="loc_opy_SecuritiesLoanedAmountNotOffsetAgainstCollateral_733fe393-d478-f1ae-8653-ed64631d60e1" xlink:type="arc" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_opy_SecuritiesLoanedAmountNotOffsetAgainstCollateral_733fe393-d478-f1ae-8653-ed64631d60e1" xlink:to="loc_us-gaap_SecuritiesLoanedGross_450aeb3c-2478-c606-22ff-81f62572fd20" xlink:type="arc" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_opy_SecuritiesLoanedAmountNotOffsetAgainstCollateral_733fe393-d478-f1ae-8653-ed64631d60e1" xlink:to="loc_us-gaap_SecuritiesLoanedAsset_870eced1-ece4-579b-5805-cb2c28df3a97" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.opco.com/role/CollateralizedTransactionsScheduleOfGrossAmountsAndOffsettingAmountsOfReverseRepurchaseAgreementsRepurchaseAgreementsSecuritiesBorrowedAndSecuritiesLendingTransactionsDetailsCalc2" xlink:type="extended">
    <link:loc xlink:href="opy-20190331.xsd#opy_DerivativeLiabilitySecuritiesSoldunderAgreementstoResellSecuritiesLoanedAmountNotOffsetAgainstCollateral" xlink:label="loc_opy_DerivativeLiabilitySecuritiesSoldunderAgreementstoResellSecuritiesLoanedAmountNotOffsetAgainstCollateral_A68E70314A7B1DFE12415E2307EE90CD_e3f02f8b-1d2c-7516-e086-ed6462c8c1c1" xlink:type="locator" />
    <link:loc xlink:href="opy-20190331.xsd#opy_SecuritiesSoldunderAgreementstoRepurchaseAmountNotOffsetAgainstCollateral" xlink:label="loc_opy_SecuritiesSoldunderAgreementstoRepurchaseAmountNotOffsetAgainstCollateral_A68E70314A7B1DFE12415E2307EE90CD_1ded7169-5cdd-eb6b-cdb2-ed6463238f9a" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_opy_DerivativeLiabilitySecuritiesSoldunderAgreementstoResellSecuritiesLoanedAmountNotOffsetAgainstCollateral_A68E70314A7B1DFE12415E2307EE90CD_e3f02f8b-1d2c-7516-e086-ed6462c8c1c1" xlink:to="loc_opy_SecuritiesSoldunderAgreementstoRepurchaseAmountNotOffsetAgainstCollateral_A68E70314A7B1DFE12415E2307EE90CD_1ded7169-5cdd-eb6b-cdb2-ed6463238f9a" xlink:type="arc" />
    <link:loc xlink:href="opy-20190331.xsd#opy_SecuritiesLoanedAmountNotOffsetAgainstCollateral" xlink:label="loc_opy_SecuritiesLoanedAmountNotOffsetAgainstCollateral_A68E70314A7B1DFE12415E2307EE90CD_733fe393-d478-f1ae-8653-ed64631d60e1" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_opy_DerivativeLiabilitySecuritiesSoldunderAgreementstoResellSecuritiesLoanedAmountNotOffsetAgainstCollateral_A68E70314A7B1DFE12415E2307EE90CD_e3f02f8b-1d2c-7516-e086-ed6462c8c1c1" xlink:to="loc_opy_SecuritiesLoanedAmountNotOffsetAgainstCollateral_A68E70314A7B1DFE12415E2307EE90CD_733fe393-d478-f1ae-8653-ed64631d60e1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection" xlink:label="loc_us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_A68E70314A7B1DFE12415E2307EE90CD_8d82ec5f-921a-0be1-c4a1-720d469a4863" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SecuritiesPurchasedUnderAgreementsToResellOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection" xlink:label="loc_us-gaap_SecuritiesPurchasedUnderAgreementsToResellOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_A68E70314A7B1DFE12415E2307EE90CD_399f61d1-a0fa-3dd4-9a5a-651219950d71" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_A68E70314A7B1DFE12415E2307EE90CD_8d82ec5f-921a-0be1-c4a1-720d469a4863" xlink:to="loc_us-gaap_SecuritiesPurchasedUnderAgreementsToResellOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_A68E70314A7B1DFE12415E2307EE90CD_399f61d1-a0fa-3dd4-9a5a-651219950d71" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SecuritiesBorrowedOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection" xlink:label="loc_us-gaap_SecuritiesBorrowedOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_A68E70314A7B1DFE12415E2307EE90CD_2f47f23e-b7ef-16a8-1fd5-cdf021116282" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_A68E70314A7B1DFE12415E2307EE90CD_8d82ec5f-921a-0be1-c4a1-720d469a4863" xlink:to="loc_us-gaap_SecuritiesBorrowedOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_A68E70314A7B1DFE12415E2307EE90CD_2f47f23e-b7ef-16a8-1fd5-cdf021116282" xlink:type="arc" />
    <link:loc xlink:href="opy-20190331.xsd#opy_DerivativeAssetSecuritiesPurchasedunderAgreementtoResellSecuritiesBorrowedNotOffsetAgainstCollateral" xlink:label="loc_opy_DerivativeAssetSecuritiesPurchasedunderAgreementtoResellSecuritiesBorrowedNotOffsetAgainstCollateral_A68E70314A7B1DFE12415E2307EE90CD_39fd7a24-225d-778e-da03-ed6462ea5692" xlink:type="locator" />
    <link:loc xlink:href="opy-20190331.xsd#opy_SecuritiesPurchasedunderAgreementtoResellAmountNotOffsetAgainstCollateral" xlink:label="loc_opy_SecuritiesPurchasedunderAgreementtoResellAmountNotOffsetAgainstCollateral_A68E70314A7B1DFE12415E2307EE90CD_893fa27e-190e-7e66-562f-ed64627cf517" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_opy_DerivativeAssetSecuritiesPurchasedunderAgreementtoResellSecuritiesBorrowedNotOffsetAgainstCollateral_A68E70314A7B1DFE12415E2307EE90CD_39fd7a24-225d-778e-da03-ed6462ea5692" xlink:to="loc_opy_SecuritiesPurchasedunderAgreementtoResellAmountNotOffsetAgainstCollateral_A68E70314A7B1DFE12415E2307EE90CD_893fa27e-190e-7e66-562f-ed64627cf517" xlink:type="arc" />
    <link:loc xlink:href="opy-20190331.xsd#opy_SecuritiesBorrowedAmountNotOffsetAgainstCollateral" xlink:label="loc_opy_SecuritiesBorrowedAmountNotOffsetAgainstCollateral_A68E70314A7B1DFE12415E2307EE90CD_c96f2dc2-b03e-8c93-a864-ed64634b8c34" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_opy_DerivativeAssetSecuritiesPurchasedunderAgreementtoResellSecuritiesBorrowedNotOffsetAgainstCollateral_A68E70314A7B1DFE12415E2307EE90CD_39fd7a24-225d-778e-da03-ed6462ea5692" xlink:to="loc_opy_SecuritiesBorrowedAmountNotOffsetAgainstCollateral_A68E70314A7B1DFE12415E2307EE90CD_c96f2dc2-b03e-8c93-a864-ed64634b8c34" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.opco.com/role/CollateralizedTransactionsTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.opco.com/role/CommitmentsAndContingencies" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.opco.com/role/CommitmentsAndContingenciesNarrativeDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.opco.com/role/CommitmentsAndContingenciesTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.opco.com/role/ConsolidatedBalanceSheets" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquity" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_63817d40-f759-fa9c-45a5-8bbbb36ed5c9" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_Liabilities" xlink:label="loc_us-gaap_Liabilities_066608da-f041-4af6-3da0-95354b640e11" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_63817d40-f759-fa9c-45a5-8bbbb36ed5c9" xlink:to="loc_us-gaap_Liabilities_066608da-f041-4af6-3da0-95354b640e11" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_e0c0480e-e6f5-c4df-ce25-1ffa4a8c827a" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_63817d40-f759-fa9c-45a5-8bbbb36ed5c9" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_e0c0480e-e6f5-c4df-ce25-1ffa4a8c827a" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CommonStockValue" xlink:label="loc_us-gaap_CommonStockValue_aefe3f0c-abe4-5b83-9a64-da77d8e253dd" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_e0c0480e-e6f5-c4df-ce25-1ffa4a8c827a" xlink:to="loc_us-gaap_CommonStockValue_aefe3f0c-abe4-5b83-9a64-da77d8e253dd" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AdditionalPaidInCapitalCommonStock" xlink:label="loc_us-gaap_AdditionalPaidInCapitalCommonStock_df284507-8ac7-eed1-41db-05e81b70be6d" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_e0c0480e-e6f5-c4df-ce25-1ffa4a8c827a" xlink:to="loc_us-gaap_AdditionalPaidInCapitalCommonStock_df284507-8ac7-eed1-41db-05e81b70be6d" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RetainedEarningsAccumulatedDeficit" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_a59bc5ae-63a0-c9bc-32f7-e2bd9f32bd26" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_e0c0480e-e6f5-c4df-ce25-1ffa4a8c827a" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_a59bc5ae-63a0-c9bc-32f7-e2bd9f32bd26" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_798442bf-12e1-d944-3fa1-8b797b67482e" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_e0c0480e-e6f5-c4df-ce25-1ffa4a8c827a" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_798442bf-12e1-d944-3fa1-8b797b67482e" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CommitmentsAndContingencies" xlink:label="loc_us-gaap_CommitmentsAndContingencies_f0c68f4f-7ec1-d447-8ba7-0f2766abbe67" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_63817d40-f759-fa9c-45a5-8bbbb36ed5c9" xlink:to="loc_us-gaap_CommitmentsAndContingencies_f0c68f4f-7ec1-d447-8ba7-0f2766abbe67" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.opco.com/role/ConsolidatedBalanceSheetsParenthetical" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.opco.com/role/ConsolidatedStatementsOfCashFlows" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease" xlink:label="loc_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_ad8f5587-cd30-97dd-9cf0-81ed4f58516c" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_1bd0bd4e-4a6f-b052-029c-0ecb0c520251" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_ad8f5587-cd30-97dd-9cf0-81ed4f58516c" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_1bd0bd4e-4a6f-b052-029c-0ecb0c520251" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DepreciationAmortizationAndAccretionNet" xlink:label="loc_us-gaap_DepreciationAmortizationAndAccretionNet_eb909908-629e-b0dc-c0ba-a7cb50bec143" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_1bd0bd4e-4a6f-b052-029c-0ecb0c520251" xlink:to="loc_us-gaap_DepreciationAmortizationAndAccretionNet_eb909908-629e-b0dc-c0ba-a7cb50bec143" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DeferredIncomeTaxesAndTaxCredits" xlink:label="loc_us-gaap_DeferredIncomeTaxesAndTaxCredits_d346b6a0-4ddf-16a5-9e91-c8c6b50db7a6" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_1bd0bd4e-4a6f-b052-029c-0ecb0c520251" xlink:to="loc_us-gaap_DeferredIncomeTaxesAndTaxCredits_d346b6a0-4ddf-16a5-9e91-c8c6b50db7a6" xlink:type="arc" />
    <link:loc xlink:href="opy-20190331.xsd#opy_AmortizationOfNotesReceivable" xlink:label="loc_opy_AmortizationOfNotesReceivable_4ec65a89-1b2b-2fae-2d65-ed6462f08a7a" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_1bd0bd4e-4a6f-b052-029c-0ecb0c520251" xlink:to="loc_opy_AmortizationOfNotesReceivable_4ec65a89-1b2b-2fae-2d65-ed6462f08a7a" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AmortizationOfFinancingCosts" xlink:label="loc_us-gaap_AmortizationOfFinancingCosts_b412c390-dfec-d4c8-f13e-036e3b49278c" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_1bd0bd4e-4a6f-b052-029c-0ecb0c520251" xlink:to="loc_us-gaap_AmortizationOfFinancingCosts_b412c390-dfec-d4c8-f13e-036e3b49278c" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ProvisionForOtherCreditLosses" xlink:label="loc_us-gaap_ProvisionForOtherCreditLosses_99f6c05c-bede-0cec-8a38-4b1231e3c0b1" xlink:type="locator" />
    <link:calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_1bd0bd4e-4a6f-b052-029c-0ecb0c520251" xlink:to="loc_us-gaap_ProvisionForOtherCreditLosses_99f6c05c-bede-0cec-8a38-4b1231e3c0b1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensation" xlink:label="loc_us-gaap_ShareBasedCompensation_90cbc3ab-f555-6407-b3b4-b2bfa84c9f18" xlink:type="locator" />
    <link:calculationArc order="6" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_1bd0bd4e-4a6f-b052-029c-0ecb0c520251" xlink:to="loc_us-gaap_ShareBasedCompensation_90cbc3ab-f555-6407-b3b4-b2bfa84c9f18" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncreaseDecreaseInDepositOtherAssets" xlink:label="loc_us-gaap_IncreaseDecreaseInDepositOtherAssets_5e1e9e85-84f2-b25a-e88c-265f39456f6f" xlink:type="locator" />
    <link:calculationArc order="7" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_1bd0bd4e-4a6f-b052-029c-0ecb0c520251" xlink:to="loc_us-gaap_IncreaseDecreaseInDepositOtherAssets_5e1e9e85-84f2-b25a-e88c-265f39456f6f" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncreaseDecreaseInBrokerageReceivables" xlink:label="loc_us-gaap_IncreaseDecreaseInBrokerageReceivables_af3118c7-6b27-d8a8-942a-641e64a937e6" xlink:type="locator" />
    <link:calculationArc order="8" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_1bd0bd4e-4a6f-b052-029c-0ecb0c520251" xlink:to="loc_us-gaap_IncreaseDecreaseInBrokerageReceivables_af3118c7-6b27-d8a8-942a-641e64a937e6" xlink:type="arc" />
    <link:loc xlink:href="opy-20190331.xsd#opy_IncreaseDecreaseInReceivableFromCustomers" xlink:label="loc_opy_IncreaseDecreaseInReceivableFromCustomers_afeb6889-0442-c044-a2ee-ed64632872aa" xlink:type="locator" />
    <link:calculationArc order="9" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_1bd0bd4e-4a6f-b052-029c-0ecb0c520251" xlink:to="loc_opy_IncreaseDecreaseInReceivableFromCustomers_afeb6889-0442-c044-a2ee-ed64632872aa" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncreaseDecreaseInIncomeTaxesReceivable" xlink:label="loc_us-gaap_IncreaseDecreaseInIncomeTaxesReceivable_18d902bc-637c-7a0c-8048-153419aa295b" xlink:type="locator" />
    <link:calculationArc order="10" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_1bd0bd4e-4a6f-b052-029c-0ecb0c520251" xlink:to="loc_us-gaap_IncreaseDecreaseInIncomeTaxesReceivable_18d902bc-637c-7a0c-8048-153419aa295b" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncreaseDecreaseInReceivablesUnderRepurchaseAgreements" xlink:label="loc_us-gaap_IncreaseDecreaseInReceivablesUnderRepurchaseAgreements_d1f32d2e-2008-7594-4f88-50a079cd3c92" xlink:type="locator" />
    <link:calculationArc order="11" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_1bd0bd4e-4a6f-b052-029c-0ecb0c520251" xlink:to="loc_us-gaap_IncreaseDecreaseInReceivablesUnderRepurchaseAgreements_d1f32d2e-2008-7594-4f88-50a079cd3c92" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncreaseDecreaseInFinancialInstrumentsUsedInOperatingActivities" xlink:label="loc_us-gaap_IncreaseDecreaseInFinancialInstrumentsUsedInOperatingActivities_e0a861eb-28e3-0253-6714-34e4b0f32270" xlink:type="locator" />
    <link:calculationArc order="12" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_1bd0bd4e-4a6f-b052-029c-0ecb0c520251" xlink:to="loc_us-gaap_IncreaseDecreaseInFinancialInstrumentsUsedInOperatingActivities_e0a861eb-28e3-0253-6714-34e4b0f32270" xlink:type="arc" />
    <link:loc xlink:href="opy-20190331.xsd#opy_IncreaseDecreaseInDueFromEmployeeCurrentAndNoncurrent" xlink:label="loc_opy_IncreaseDecreaseInDueFromEmployeeCurrentAndNoncurrent_4138ab21-61bb-c9da-71bb-ed6463483bf7" xlink:type="locator" />
    <link:calculationArc order="13" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_1bd0bd4e-4a6f-b052-029c-0ecb0c520251" xlink:to="loc_opy_IncreaseDecreaseInDueFromEmployeeCurrentAndNoncurrent_4138ab21-61bb-c9da-71bb-ed6463483bf7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncreaseDecreaseInOtherOperatingAssets" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherOperatingAssets_d54a644c-3d3c-bcc1-da30-2f136651f90f" xlink:type="locator" />
    <link:calculationArc order="14" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_1bd0bd4e-4a6f-b052-029c-0ecb0c520251" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherOperatingAssets_d54a644c-3d3c-bcc1-da30-2f136651f90f" xlink:type="arc" />
    <link:loc xlink:href="opy-20190331.xsd#opy_IncreaseDecreaseInDraftPayable" xlink:label="loc_opy_IncreaseDecreaseInDraftPayable_96926edd-14b6-2235-d51c-ed6462e3c541" xlink:type="locator" />
    <link:calculationArc order="15" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_1bd0bd4e-4a6f-b052-029c-0ecb0c520251" xlink:to="loc_opy_IncreaseDecreaseInDraftPayable_96926edd-14b6-2235-d51c-ed6462e3c541" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncreaseDecreaseInPayablesToBrokerDealers" xlink:label="loc_us-gaap_IncreaseDecreaseInPayablesToBrokerDealers_e3577e4d-7823-a793-09ef-e563df43bff4" xlink:type="locator" />
    <link:calculationArc order="16" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_1bd0bd4e-4a6f-b052-029c-0ecb0c520251" xlink:to="loc_us-gaap_IncreaseDecreaseInPayablesToBrokerDealers_e3577e4d-7823-a793-09ef-e563df43bff4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncreaseDecreaseInPayablesToCustomers" xlink:label="loc_us-gaap_IncreaseDecreaseInPayablesToCustomers_da6ec453-ef45-9d88-5ed2-63929e711186" xlink:type="locator" />
    <link:calculationArc order="17" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_1bd0bd4e-4a6f-b052-029c-0ecb0c520251" xlink:to="loc_us-gaap_IncreaseDecreaseInPayablesToCustomers_da6ec453-ef45-9d88-5ed2-63929e711186" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncreaseDecreaseInPayablesUnderRepurchaseAgreements" xlink:label="loc_us-gaap_IncreaseDecreaseInPayablesUnderRepurchaseAgreements_37111e02-100f-8e96-8b95-e11605e7d352" xlink:type="locator" />
    <link:calculationArc order="18" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_1bd0bd4e-4a6f-b052-029c-0ecb0c520251" xlink:to="loc_us-gaap_IncreaseDecreaseInPayablesUnderRepurchaseAgreements_37111e02-100f-8e96-8b95-e11605e7d352" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncreaseDecreaseInFinancialInstrumentsSoldNotYetPurchased" xlink:label="loc_us-gaap_IncreaseDecreaseInFinancialInstrumentsSoldNotYetPurchased_b5c16c86-3aa1-2d22-f2c6-95fd9e84d84b" xlink:type="locator" />
    <link:calculationArc order="19" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_1bd0bd4e-4a6f-b052-029c-0ecb0c520251" xlink:to="loc_us-gaap_IncreaseDecreaseInFinancialInstrumentsSoldNotYetPurchased_b5c16c86-3aa1-2d22-f2c6-95fd9e84d84b" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities" xlink:label="loc_us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities_bb8c0c41-60b6-6ad9-c835-6a671aae07c5" xlink:type="locator" />
    <link:calculationArc order="20" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_1bd0bd4e-4a6f-b052-029c-0ecb0c520251" xlink:to="loc_us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities_bb8c0c41-60b6-6ad9-c835-6a671aae07c5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_91c354d1-d18f-051e-80cb-f13c01058b9d" xlink:type="locator" />
    <link:calculationArc order="21" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_1bd0bd4e-4a6f-b052-029c-0ecb0c520251" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_91c354d1-d18f-051e-80cb-f13c01058b9d" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable" xlink:label="loc_us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable_e69a15cf-ab4b-cbea-dc70-0b76971b08a1" xlink:type="locator" />
    <link:calculationArc order="22" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_1bd0bd4e-4a6f-b052-029c-0ecb0c520251" xlink:to="loc_us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable_e69a15cf-ab4b-cbea-dc70-0b76971b08a1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaap_NetIncomeLoss_a10eea14-f4db-3125-d183-77bb54500e95" xlink:type="locator" />
    <link:calculationArc order="23" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_1bd0bd4e-4a6f-b052-029c-0ecb0c520251" xlink:to="loc_us-gaap_NetIncomeLoss_a10eea14-f4db-3125-d183-77bb54500e95" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_28655e34-499f-b7bf-c54f-5de0990d0c65" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_ad8f5587-cd30-97dd-9cf0-81ed4f58516c" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_28655e34-499f-b7bf-c54f-5de0990d0c65" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment" xlink:label="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_6d89f221-3ede-36b2-fcad-4a4ce1606f6a" xlink:type="locator" />
    <link:calculationArc order="1" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_28655e34-499f-b7bf-c54f-5de0990d0c65" xlink:to="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_6d89f221-3ede-36b2-fcad-4a4ce1606f6a" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PaymentsToAcquireIntangibleAssets" xlink:label="loc_us-gaap_PaymentsToAcquireIntangibleAssets_1e99261d-1af1-2d77-636d-890a4a9c4511" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_28655e34-499f-b7bf-c54f-5de0990d0c65" xlink:to="loc_us-gaap_PaymentsToAcquireIntangibleAssets_1e99261d-1af1-2d77-636d-890a4a9c4511" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_d8917e24-06dd-060d-a290-e426c7895e54" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_ad8f5587-cd30-97dd-9cf0-81ed4f58516c" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_d8917e24-06dd-060d-a290-e426c7895e54" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PaymentsOfDividendsCommonStock" xlink:label="loc_us-gaap_PaymentsOfDividendsCommonStock_15de0c29-7f29-fc68-dcff-36f8e7ff06d8" xlink:type="locator" />
    <link:calculationArc order="1" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_d8917e24-06dd-060d-a290-e426c7895e54" xlink:to="loc_us-gaap_PaymentsOfDividendsCommonStock_15de0c29-7f29-fc68-dcff-36f8e7ff06d8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PaymentsForRepurchaseOfCommonStock" xlink:label="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_d4a92697-d008-996b-823a-bd9a56a04b3a" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_d8917e24-06dd-060d-a290-e426c7895e54" xlink:to="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_d4a92697-d008-996b-823a-bd9a56a04b3a" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation" xlink:label="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_43305c85-41ff-3d0f-c464-dc8983363bce" xlink:type="locator" />
    <link:calculationArc order="3" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_d8917e24-06dd-060d-a290-e426c7895e54" xlink:to="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_43305c85-41ff-3d0f-c464-dc8983363bce" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ProceedsFromPaymentsForOtherFinancingActivities" xlink:label="loc_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_38e7f3e2-9d1a-8772-e4aa-fb2cb7d8adc0" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_d8917e24-06dd-060d-a290-e426c7895e54" xlink:to="loc_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_38e7f3e2-9d1a-8772-e4aa-fb2cb7d8adc0" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.opco.com/role/ConsolidatedStatementsOfChangesInStockholdersEquity" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.opco.com/role/ConsolidatedStatementsOfChangesInStockholdersEquityParenthetical" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.opco.com/role/ConsolidatedStatementsOfComprehensiveIncomeLoss" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTax" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTax_cf605d39-9067-2f07-a6b5-7dfa6481009e" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_0e67d263-6e0f-cbd4-f553-6c8cebeb68d8" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTax_cf605d39-9067-2f07-a6b5-7dfa6481009e" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_0e67d263-6e0f-cbd4-f553-6c8cebeb68d8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_b087c8bb-e0f6-4c7f-883c-027f52d32745" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_0e67d263-6e0f-cbd4-f553-6c8cebeb68d8" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_b087c8bb-e0f6-4c7f-883c-027f52d32745" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.opco.com/role/ConsolidatedStatementsOfOperations" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_4d8b6d19-6a54-06aa-2077-c10380bd20d1" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_Revenues" xlink:label="loc_us-gaap_Revenues_435f940b-a471-4122-5132-a245458f6913" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_4d8b6d19-6a54-06aa-2077-c10380bd20d1" xlink:to="loc_us-gaap_Revenues_435f940b-a471-4122-5132-a245458f6913" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_BrokerageCommissionsRevenue" xlink:label="loc_us-gaap_BrokerageCommissionsRevenue_8f866e44-126b-5958-771c-840b563df2ba" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Revenues_435f940b-a471-4122-5132-a245458f6913" xlink:to="loc_us-gaap_BrokerageCommissionsRevenue_8f866e44-126b-5958-771c-840b563df2ba" xlink:type="arc" />
    <link:loc xlink:href="opy-20190331.xsd#opy_InvestmentAdvisoryFeeRevenue" xlink:label="loc_opy_InvestmentAdvisoryFeeRevenue_AC1BDD9537A15E8E7CFFEDE51494D912" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Revenues_435f940b-a471-4122-5132-a245458f6913" xlink:to="loc_opy_InvestmentAdvisoryFeeRevenue_AC1BDD9537A15E8E7CFFEDE51494D912" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_InvestmentBankingRevenue" xlink:label="loc_us-gaap_InvestmentBankingRevenue_efd5e807-952b-4fd0-8a25-dae20f8eb0f5" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Revenues_435f940b-a471-4122-5132-a245458f6913" xlink:to="loc_us-gaap_InvestmentBankingRevenue_efd5e807-952b-4fd0-8a25-dae20f8eb0f5" xlink:type="arc" />
    <link:loc xlink:href="opy-20190331.xsd#opy_SweepInterestIncomefromFDICInsuredBankDeposits" xlink:label="loc_opy_SweepInterestIncomefromFDICInsuredBankDeposits_7f253c91-88bc-7023-348b-ed646267019f" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Revenues_435f940b-a471-4122-5132-a245458f6913" xlink:to="loc_opy_SweepInterestIncomefromFDICInsuredBankDeposits_7f253c91-88bc-7023-348b-ed646267019f" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_InterestIncomeOperating" xlink:label="loc_us-gaap_InterestIncomeOperating_49a20539-5304-2297-96e1-4142f54e0b45" xlink:type="locator" />
    <link:calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Revenues_435f940b-a471-4122-5132-a245458f6913" xlink:to="loc_us-gaap_InterestIncomeOperating_49a20539-5304-2297-96e1-4142f54e0b45" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PrincipalTransactionsRevenue" xlink:label="loc_us-gaap_PrincipalTransactionsRevenue_e4f07426-c0ec-5d2a-d9b4-0e0680a4257d" xlink:type="locator" />
    <link:calculationArc order="6" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Revenues_435f940b-a471-4122-5132-a245458f6913" xlink:to="loc_us-gaap_PrincipalTransactionsRevenue_e4f07426-c0ec-5d2a-d9b4-0e0680a4257d" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OtherIncome" xlink:label="loc_us-gaap_OtherIncome_bb610d99-851f-be70-f405-1d0649f0a727" xlink:type="locator" />
    <link:calculationArc order="7" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Revenues_435f940b-a471-4122-5132-a245458f6913" xlink:to="loc_us-gaap_OtherIncome_bb610d99-851f-be70-f405-1d0649f0a727" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingExpenses" xlink:label="loc_us-gaap_OperatingExpenses_a2f4cf19-54a3-c9c5-9b4d-23b76125e270" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_4d8b6d19-6a54-06aa-2077-c10380bd20d1" xlink:to="loc_us-gaap_OperatingExpenses_a2f4cf19-54a3-c9c5-9b4d-23b76125e270" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LaborAndRelatedExpense" xlink:label="loc_us-gaap_LaborAndRelatedExpense_1283cb92-0ae2-bdeb-f803-6d5e502ce8d9" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingExpenses_a2f4cf19-54a3-c9c5-9b4d-23b76125e270" xlink:to="loc_us-gaap_LaborAndRelatedExpense_1283cb92-0ae2-bdeb-f803-6d5e502ce8d9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OccupancyNet" xlink:label="loc_us-gaap_OccupancyNet_68bf179a-5657-6e43-7e40-d1c7486e0d10" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingExpenses_a2f4cf19-54a3-c9c5-9b4d-23b76125e270" xlink:to="loc_us-gaap_OccupancyNet_68bf179a-5657-6e43-7e40-d1c7486e0d10" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CommunicationsAndInformationTechnology" xlink:label="loc_us-gaap_CommunicationsAndInformationTechnology_bd84e095-dc8c-1acf-3b16-bb2de2cba362" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingExpenses_a2f4cf19-54a3-c9c5-9b4d-23b76125e270" xlink:to="loc_us-gaap_CommunicationsAndInformationTechnology_bd84e095-dc8c-1acf-3b16-bb2de2cba362" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_InterestExpense" xlink:label="loc_us-gaap_InterestExpense_a56b34b7-57ab-a07c-7f03-8366849a14f0" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingExpenses_a2f4cf19-54a3-c9c5-9b4d-23b76125e270" xlink:to="loc_us-gaap_InterestExpense_a56b34b7-57ab-a07c-7f03-8366849a14f0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FloorBrokerageExchangeAndClearanceFees" xlink:label="loc_us-gaap_FloorBrokerageExchangeAndClearanceFees_90e0e0ae-0687-f555-8afb-f78eb984fa6b" xlink:type="locator" />
    <link:calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingExpenses_a2f4cf19-54a3-c9c5-9b4d-23b76125e270" xlink:to="loc_us-gaap_FloorBrokerageExchangeAndClearanceFees_90e0e0ae-0687-f555-8afb-f78eb984fa6b" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OtherExpenses" xlink:label="loc_us-gaap_OtherExpenses_3c9060db-2e17-655e-a9d2-198a0d053c05" xlink:type="locator" />
    <link:calculationArc order="6" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingExpenses_a2f4cf19-54a3-c9c5-9b4d-23b76125e270" xlink:to="loc_us-gaap_OtherExpenses_3c9060db-2e17-655e-a9d2-198a0d053c05" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.opco.com/role/DocumentAndEntityInformation" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.opco.com/role/EarningsPerShare" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.opco.com/role/EarningsPerShareSummaryOfEarningsPerShareDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_21ce4f2f-397c-6c02-8635-7c94146a06a0" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_2dd9a981-e559-d141-f1c2-4db79f71a7ef" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_21ce4f2f-397c-6c02-8635-7c94146a06a0" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_2dd9a981-e559-d141-f1c2-4db79f71a7ef" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements" xlink:label="loc_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_e52bef3f-d63a-d129-8b6a-48192f5d97b3" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_21ce4f2f-397c-6c02-8635-7c94146a06a0" xlink:to="loc_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_e52bef3f-d63a-d129-8b6a-48192f5d97b3" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.opco.com/role/EarningsPerShareSummaryOfEarningsPerShareNarrativeDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.opco.com/role/EarningsPerShareTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.opco.com/role/FairValueMeasurements" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.opco.com/role/FairValueMeasurementsAdditionalInformationNarrativeDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.opco.com/role/FairValueMeasurementsAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LiabilitiesFairValueDisclosure" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosure_6bae24fb-c89c-2c1d-91e1-c77efe1775f1" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DerivativeLiabilities" xlink:label="loc_us-gaap_DerivativeLiabilities_7e8e10f8-8ddc-2b6a-eea7-ea4d306368a1" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosure_6bae24fb-c89c-2c1d-91e1-c77efe1775f1" xlink:to="loc_us-gaap_DerivativeLiabilities_7e8e10f8-8ddc-2b6a-eea7-ea4d306368a1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecuritySoldNotYetPurchased" xlink:label="loc_us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecuritySoldNotYetPurchased_f3d62829-f75d-1ca2-d96f-207e637c2a97" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosure_6bae24fb-c89c-2c1d-91e1-c77efe1775f1" xlink:to="loc_us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecuritySoldNotYetPurchased_f3d62829-f75d-1ca2-d96f-207e637c2a97" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.opco.com/role/FairValueMeasurementsAssetsAndLiabilitiesNotMeasuredAtFairValueOnRecurringBasisDetails" xlink:type="extended">
    <link:loc xlink:href="opy-20190331.xsd#opy_FairValueEstimateNotPracticablePayablesToBrokerDealersAndClearingOrganizations" xlink:label="loc_opy_FairValueEstimateNotPracticablePayablesToBrokerDealersAndClearingOrganizations_32ccd8b6-baa3-a711-fccd-ed64629b2169" xlink:type="locator" />
    <link:loc xlink:href="opy-20190331.xsd#opy_FairValueEstimateNotPracticableDepositsReceivedForSecuritiesLoaned" xlink:label="loc_opy_FairValueEstimateNotPracticableDepositsReceivedForSecuritiesLoaned_bca3f1e6-1b56-efaf-7a2a-ed6462883a1a" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_opy_FairValueEstimateNotPracticablePayablesToBrokerDealersAndClearingOrganizations_32ccd8b6-baa3-a711-fccd-ed64629b2169" xlink:to="loc_opy_FairValueEstimateNotPracticableDepositsReceivedForSecuritiesLoaned_bca3f1e6-1b56-efaf-7a2a-ed6462883a1a" xlink:type="arc" />
    <link:loc xlink:href="opy-20190331.xsd#opy_FairValueEstimateNotPracticablePayabletoCorrespondentBrokers" xlink:label="loc_opy_FairValueEstimateNotPracticablePayabletoCorrespondentBrokers_84e8ba1b-a5ad-be8d-8f58-ed6462fcbc49" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_opy_FairValueEstimateNotPracticablePayablesToBrokerDealersAndClearingOrganizations_32ccd8b6-baa3-a711-fccd-ed64629b2169" xlink:to="loc_opy_FairValueEstimateNotPracticablePayabletoCorrespondentBrokers_84e8ba1b-a5ad-be8d-8f58-ed6462fcbc49" xlink:type="arc" />
    <link:loc xlink:href="opy-20190331.xsd#opy_FairValueEstimateNotPracticableSecuritiesFailedToReceive" xlink:label="loc_opy_FairValueEstimateNotPracticableSecuritiesFailedToReceive_085ba2bb-2663-bd32-c68e-ed6462a47c40" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_opy_FairValueEstimateNotPracticablePayablesToBrokerDealersAndClearingOrganizations_32ccd8b6-baa3-a711-fccd-ed64629b2169" xlink:to="loc_opy_FairValueEstimateNotPracticableSecuritiesFailedToReceive_085ba2bb-2663-bd32-c68e-ed6462a47c40" xlink:type="arc" />
    <link:loc xlink:href="opy-20190331.xsd#opy_FairValueEstimateNotPracticableOtherPayablesToBrokerDealersAndClearingOrganizations" xlink:label="loc_opy_FairValueEstimateNotPracticableOtherPayablesToBrokerDealersAndClearingOrganizations_31fa1baf-57b3-54c6-1685-ed646261e547" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_opy_FairValueEstimateNotPracticablePayablesToBrokerDealersAndClearingOrganizations_32ccd8b6-baa3-a711-fccd-ed64629b2169" xlink:to="loc_opy_FairValueEstimateNotPracticableOtherPayablesToBrokerDealersAndClearingOrganizations_31fa1baf-57b3-54c6-1685-ed646261e547" xlink:type="arc" />
    <link:loc xlink:href="opy-20190331.xsd#opy_FairValueEstimateNotPracticableReceivablesFromBrokersDealersAndClearingOrganizations" xlink:label="loc_opy_FairValueEstimateNotPracticableReceivablesFromBrokersDealersAndClearingOrganizations_6881023c-1dad-b872-f4b5-ed6463325c97" xlink:type="locator" />
    <link:loc xlink:href="opy-20190331.xsd#opy_FairValueEstimateNotPracticableDepositsPaidForSecuritiesBorrowed" xlink:label="loc_opy_FairValueEstimateNotPracticableDepositsPaidForSecuritiesBorrowed_bf24a757-40e0-63df-f53b-ed64632d9b4b" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_opy_FairValueEstimateNotPracticableReceivablesFromBrokersDealersAndClearingOrganizations_6881023c-1dad-b872-f4b5-ed6463325c97" xlink:to="loc_opy_FairValueEstimateNotPracticableDepositsPaidForSecuritiesBorrowed_bf24a757-40e0-63df-f53b-ed64632d9b4b" xlink:type="arc" />
    <link:loc xlink:href="opy-20190331.xsd#opy_FairValueEstimateNotPracticableDueFromCorrespondentBrokers" xlink:label="loc_opy_FairValueEstimateNotPracticableDueFromCorrespondentBrokers_06b7d134-f2b2-b2d0-51a1-ed64630ccd60" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_opy_FairValueEstimateNotPracticableReceivablesFromBrokersDealersAndClearingOrganizations_6881023c-1dad-b872-f4b5-ed6463325c97" xlink:to="loc_opy_FairValueEstimateNotPracticableDueFromCorrespondentBrokers_06b7d134-f2b2-b2d0-51a1-ed64630ccd60" xlink:type="arc" />
    <link:loc xlink:href="opy-20190331.xsd#opy_FairValueEstimateNotPracticableSecuritiesFailedToDeliver" xlink:label="loc_opy_FairValueEstimateNotPracticableSecuritiesFailedToDeliver_ee615a1a-38e5-a904-88c0-ed64626eb38e" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_opy_FairValueEstimateNotPracticableReceivablesFromBrokersDealersAndClearingOrganizations_6881023c-1dad-b872-f4b5-ed6463325c97" xlink:to="loc_opy_FairValueEstimateNotPracticableSecuritiesFailedToDeliver_ee615a1a-38e5-a904-88c0-ed64626eb38e" xlink:type="arc" />
    <link:loc xlink:href="opy-20190331.xsd#opy_FairValueEstimateNotPracticableReceivablesFromClearingOrganizations" xlink:label="loc_opy_FairValueEstimateNotPracticableReceivablesFromClearingOrganizations_e53cfeee-0c99-0a2a-62cc-ed646309ccc0" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_opy_FairValueEstimateNotPracticableReceivablesFromBrokersDealersAndClearingOrganizations_6881023c-1dad-b872-f4b5-ed6463325c97" xlink:to="loc_opy_FairValueEstimateNotPracticableReceivablesFromClearingOrganizations_e53cfeee-0c99-0a2a-62cc-ed646309ccc0" xlink:type="arc" />
    <link:loc xlink:href="opy-20190331.xsd#opy_FairValueEstimateNotPracticableOtherReceivablesFromBrokerDealersAndClearingOrganizations" xlink:label="loc_opy_FairValueEstimateNotPracticableOtherReceivablesFromBrokerDealersAndClearingOrganizations_d4fb11ee-de74-7f56-9c9a-ed6462606d33" xlink:type="locator" />
    <link:calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_opy_FairValueEstimateNotPracticableReceivablesFromBrokersDealersAndClearingOrganizations_6881023c-1dad-b872-f4b5-ed6463325c97" xlink:to="loc_opy_FairValueEstimateNotPracticableOtherReceivablesFromBrokerDealersAndClearingOrganizations_d4fb11ee-de74-7f56-9c9a-ed6462606d33" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.opco.com/role/FairValueMeasurementsChangesInLevel3AssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.opco.com/role/FairValueMeasurementsFairValueAmountsOfDerivativeInstrumentsAndTheirEffectOnStatementOfOperationsDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.opco.com/role/FairValueMeasurementsInvestmentsInCompanySponsoredFundsDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.opco.com/role/FairValueMeasurementsNotionalAmountsAndFairValuesOfDerivativesByProductDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.opco.com/role/FairValueMeasurementsQuantitativeInformationAboutLevel3FairValueMeasurementsDetails" xlink:type="extended">
    <link:loc xlink:href="opy-20190331.xsd#opy_FairValueOfLevelThreeAssets" xlink:label="loc_opy_FairValueOfLevelThreeAssets_fc365e7b-d3ad-3b42-8928-ed6462c291fd" xlink:type="locator" />
    <link:loc xlink:href="opy-20190331.xsd#opy_LevelThreePrincipalAmount" xlink:label="loc_opy_LevelThreePrincipalAmount_c1f99e53-233d-5828-c46f-ed6463365d96" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_opy_FairValueOfLevelThreeAssets_fc365e7b-d3ad-3b42-8928-ed6462c291fd" xlink:to="loc_opy_LevelThreePrincipalAmount_c1f99e53-233d-5828-c46f-ed6463365d96" xlink:type="arc" />
    <link:loc xlink:href="opy-20190331.xsd#opy_ValuationAdjustmentForLevelThreeAssets" xlink:label="loc_opy_ValuationAdjustmentForLevelThreeAssets_6c73cc0d-0812-3853-32b4-ed64632fb499" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_opy_FairValueOfLevelThreeAssets_fc365e7b-d3ad-3b42-8928-ed6462c291fd" xlink:to="loc_opy_ValuationAdjustmentForLevelThreeAssets_6c73cc0d-0812-3853-32b4-ed64632fb499" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.opco.com/role/FairValueMeasurementsSecuritiesOwnedAndSecuritiesSoldButNotYetPurchasedAtFairValueDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.opco.com/role/FairValueMeasurementsTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.opco.com/role/Leases" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.opco.com/role/LeasesAdditionalInformationDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.opco.com/role/LeasesScheduleOfLeaseCostDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.opco.com/role/LeasesScheduleOfMaturitiesOfLeasePaymentsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_4d26bd18-43c4-5981-04d4-83d0e9328a1d" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear_d0e3c4ab-df94-52c6-3761-ce2ed0f2f507" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_4d26bd18-43c4-5981-04d4-83d0e9328a1d" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear_d0e3c4ab-df94-52c6-3761-ce2ed0f2f507" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_e0f20176-305e-e29f-ab09-584aea596901" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_4d26bd18-43c4-5981-04d4-83d0e9328a1d" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_e0f20176-305e-e29f-ab09-584aea596901" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_8e35e675-3955-0e95-1b9c-d08dd410962e" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_4d26bd18-43c4-5981-04d4-83d0e9328a1d" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_8e35e675-3955-0e95-1b9c-d08dd410962e" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_852d78fc-d4b9-e5fb-fd5a-9da7d3d49669" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_4d26bd18-43c4-5981-04d4-83d0e9328a1d" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_852d78fc-d4b9-e5fb-fd5a-9da7d3d49669" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_7a6864a2-d55e-24e7-17f1-75d5cad038ee" xlink:type="locator" />
    <link:calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_4d26bd18-43c4-5981-04d4-83d0e9328a1d" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_7a6864a2-d55e-24e7-17f1-75d5cad038ee" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_a8c7556a-9f4c-b4fb-2e42-b21cf84287a7" xlink:type="locator" />
    <link:calculationArc order="6" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_4d26bd18-43c4-5981-04d4-83d0e9328a1d" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_a8c7556a-9f4c-b4fb-2e42-b21cf84287a7" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.opco.com/role/LeasesScheduleOfMaturitiesOfLeasePaymentsDetailsCalc2" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_C5375F1FCD9A0101F3ED563100382BDC_4d26bd18-43c4-5981-04d4-83d0e9328a1d" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_C5375F1FCD9A0101F3ED563100382BDC_dba432e7-eec4-e0dc-718d-f46fe263fe47" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_C5375F1FCD9A0101F3ED563100382BDC_4d26bd18-43c4-5981-04d4-83d0e9328a1d" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_C5375F1FCD9A0101F3ED563100382BDC_dba432e7-eec4-e0dc-718d-f46fe263fe47" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingLeaseLiability" xlink:label="loc_us-gaap_OperatingLeaseLiability_C5375F1FCD9A0101F3ED563100382BDC_41784c6f-4555-af92-3354-8f8701c77f60" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_C5375F1FCD9A0101F3ED563100382BDC_4d26bd18-43c4-5981-04d4-83d0e9328a1d" xlink:to="loc_us-gaap_OperatingLeaseLiability_C5375F1FCD9A0101F3ED563100382BDC_41784c6f-4555-af92-3354-8f8701c77f60" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.opco.com/role/LeasesTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.opco.com/role/LongTermDebt" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.opco.com/role/LongTermDebtAdditionalInformationNarrativeDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.opco.com/role/LongTermDebtScheduleOfLongTermDebtDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.opco.com/role/LongTermDebtTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.opco.com/role/NewAccountingPronouncements" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.opco.com/role/NewAccountingPronouncementsPolicies" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.opco.com/role/Organization" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.opco.com/role/OrganizationAdditionalInformationNarrativeDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.opco.com/role/ReceivableFromAndPayableToBrokersDealersAndClearingOrganizations" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.opco.com/role/ReceivableFromAndPayableToBrokersDealersAndClearingOrganizationsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ReceivablesFromBrokersDealersAndClearingOrganizations" xlink:label="loc_us-gaap_ReceivablesFromBrokersDealersAndClearingOrganizations_1138c238-1a5b-7e3b-0793-d46375d47d5e" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DepositsPaidForSecuritiesBorrowedAtCarryingValue" xlink:label="loc_us-gaap_DepositsPaidForSecuritiesBorrowedAtCarryingValue_d2706191-5860-9273-3183-3a3926a0e2d8" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ReceivablesFromBrokersDealersAndClearingOrganizations_1138c238-1a5b-7e3b-0793-d46375d47d5e" xlink:to="loc_us-gaap_DepositsPaidForSecuritiesBorrowedAtCarryingValue_d2706191-5860-9273-3183-3a3926a0e2d8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DueFromCorrespondentBrokers" xlink:label="loc_us-gaap_DueFromCorrespondentBrokers_967f6647-6706-65c6-2229-51627ad3dd7b" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ReceivablesFromBrokersDealersAndClearingOrganizations_1138c238-1a5b-7e3b-0793-d46375d47d5e" xlink:to="loc_us-gaap_DueFromCorrespondentBrokers_967f6647-6706-65c6-2229-51627ad3dd7b" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SecuritiesFailedToDeliver" xlink:label="loc_us-gaap_SecuritiesFailedToDeliver_087cf79b-c267-9903-d713-9a7ffd93057a" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ReceivablesFromBrokersDealersAndClearingOrganizations_1138c238-1a5b-7e3b-0793-d46375d47d5e" xlink:to="loc_us-gaap_SecuritiesFailedToDeliver_087cf79b-c267-9903-d713-9a7ffd93057a" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ReceivablesFromClearingOrganizations" xlink:label="loc_us-gaap_ReceivablesFromClearingOrganizations_118fa351-f003-5284-51fa-211b9b0ca690" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ReceivablesFromBrokersDealersAndClearingOrganizations_1138c238-1a5b-7e3b-0793-d46375d47d5e" xlink:to="loc_us-gaap_ReceivablesFromClearingOrganizations_118fa351-f003-5284-51fa-211b9b0ca690" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OtherReceivablesFromBrokerDealersAndClearingOrganizations" xlink:label="loc_us-gaap_OtherReceivablesFromBrokerDealersAndClearingOrganizations_29a69639-b054-eb92-7cf1-80d733e5906e" xlink:type="locator" />
    <link:calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ReceivablesFromBrokersDealersAndClearingOrganizations_1138c238-1a5b-7e3b-0793-d46375d47d5e" xlink:to="loc_us-gaap_OtherReceivablesFromBrokerDealersAndClearingOrganizations_29a69639-b054-eb92-7cf1-80d733e5906e" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PayablesToBrokerDealersAndClearingOrganizations" xlink:label="loc_us-gaap_PayablesToBrokerDealersAndClearingOrganizations_7ea40a53-6505-10a7-79d6-31aae710f9b6" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DepositsReceivedForSecuritiesLoanedAtCarryingValue" xlink:label="loc_us-gaap_DepositsReceivedForSecuritiesLoanedAtCarryingValue_37b724d4-590d-4150-7112-f8a5889e0bef" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PayablesToBrokerDealersAndClearingOrganizations_7ea40a53-6505-10a7-79d6-31aae710f9b6" xlink:to="loc_us-gaap_DepositsReceivedForSecuritiesLoanedAtCarryingValue_37b724d4-590d-4150-7112-f8a5889e0bef" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DueToCorrespondentBrokers" xlink:label="loc_us-gaap_DueToCorrespondentBrokers_4d532bfc-4476-ada6-58a6-7ad3982cf3c9" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PayablesToBrokerDealersAndClearingOrganizations_7ea40a53-6505-10a7-79d6-31aae710f9b6" xlink:to="loc_us-gaap_DueToCorrespondentBrokers_4d532bfc-4476-ada6-58a6-7ad3982cf3c9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SecuritiesFailedToReceive" xlink:label="loc_us-gaap_SecuritiesFailedToReceive_7f342a43-7453-1840-0e98-d52cef819c06" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PayablesToBrokerDealersAndClearingOrganizations_7ea40a53-6505-10a7-79d6-31aae710f9b6" xlink:to="loc_us-gaap_SecuritiesFailedToReceive_7f342a43-7453-1840-0e98-d52cef819c06" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OtherPayablesToBrokerDealersAndClearingOrganizations" xlink:label="loc_us-gaap_OtherPayablesToBrokerDealersAndClearingOrganizations_0a6529c4-7eff-a8c0-1734-cb20ff5e661e" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PayablesToBrokerDealersAndClearingOrganizations_7ea40a53-6505-10a7-79d6-31aae710f9b6" xlink:to="loc_us-gaap_OtherPayablesToBrokerDealersAndClearingOrganizations_0a6529c4-7eff-a8c0-1734-cb20ff5e661e" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.opco.com/role/ReceivableFromAndPayableToBrokersDealersAndClearingOrganizationsTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.opco.com/role/RegulatoryRequirements" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.opco.com/role/RegulatoryRequirementsAdditionalInformationNarrativeDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.opco.com/role/RevenuesFromContractsWithCustomers" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.opco.com/role/RevenuesFromContractsWithCustomersContractAssetsAndLiabilitiesDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.opco.com/role/RevenuesFromContractsWithCustomersDisaggregationOfRevenueDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.opco.com/role/RevenuesFromContractsWithCustomersTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.opco.com/role/SegmentInformation" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.opco.com/role/SegmentInformationReportedRevenueAndProfitBeforeIncomeTaxesDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.opco.com/role/SegmentInformationRevenueClassifiedByMajorGeographicAreasDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.opco.com/role/SegmentInformationTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.opco.com/role/ShareCapital" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.opco.com/role/ShareCapitalAdditionalInformationNarrativeDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.opco.com/role/ShareCapitalChangesInNumberOfSharesOfClassStockOutstandingDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.opco.com/role/ShareCapitalTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.opco.com/role/SubsequentEvents" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.opco.com/role/SubsequentEventsAdditionalInformationNarrativeDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.opco.com/role/SupplementalGuarantorCondensedConsolidatedFinancialStatementsAdditionalInformationNarrativeDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.opco.com/role/SupplementalGuarantorCondensedConsolidatedFinancialStatementsCondensedConsolidatingBalanceSheetDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_Liabilities" xlink:label="loc_us-gaap_Liabilities_066608da-f041-4af6-3da0-95354b640e11" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DraftsPayable" xlink:label="loc_us-gaap_DraftsPayable_562c66ba-3591-e605-171a-5771e98fec43" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_066608da-f041-4af6-3da0-95354b640e11" xlink:to="loc_us-gaap_DraftsPayable_562c66ba-3591-e605-171a-5771e98fec43" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_BankLoans" xlink:label="loc_us-gaap_BankLoans_21fd3cc5-0b39-5012-64c1-00b32ef29b3b" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_066608da-f041-4af6-3da0-95354b640e11" xlink:to="loc_us-gaap_BankLoans_21fd3cc5-0b39-5012-64c1-00b32ef29b3b" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PayablesToBrokerDealersAndClearingOrganizations" xlink:label="loc_us-gaap_PayablesToBrokerDealersAndClearingOrganizations_7ea40a53-6505-10a7-79d6-31aae710f9b6" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_066608da-f041-4af6-3da0-95354b640e11" xlink:to="loc_us-gaap_PayablesToBrokerDealersAndClearingOrganizations_7ea40a53-6505-10a7-79d6-31aae710f9b6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PayablesToCustomers" xlink:label="loc_us-gaap_PayablesToCustomers_7fa6db0d-c355-4b4c-15f8-8218b9113381" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_066608da-f041-4af6-3da0-95354b640e11" xlink:to="loc_us-gaap_PayablesToCustomers_7fa6db0d-c355-4b4c-15f8-8218b9113381" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SecuritiesSoldUnderAgreementsToRepurchase" xlink:label="loc_us-gaap_SecuritiesSoldUnderAgreementsToRepurchase_744877d9-d92a-da80-57fe-fd23c5ed3d2f" xlink:type="locator" />
    <link:calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_066608da-f041-4af6-3da0-95354b640e11" xlink:to="loc_us-gaap_SecuritiesSoldUnderAgreementsToRepurchase_744877d9-d92a-da80-57fe-fd23c5ed3d2f" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecuritySoldNotYetPurchased" xlink:label="loc_us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecuritySoldNotYetPurchased_f3d62829-f75d-1ca2-d96f-207e637c2a97" xlink:type="locator" />
    <link:calculationArc order="6" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_066608da-f041-4af6-3da0-95354b640e11" xlink:to="loc_us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecuritySoldNotYetPurchased_f3d62829-f75d-1ca2-d96f-207e637c2a97" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EmployeeRelatedLiabilitiesCurrentAndNoncurrent" xlink:label="loc_us-gaap_EmployeeRelatedLiabilitiesCurrentAndNoncurrent_e9552012-2cdd-6f18-1259-b230036096ed" xlink:type="locator" />
    <link:calculationArc order="7" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_066608da-f041-4af6-3da0-95354b640e11" xlink:to="loc_us-gaap_EmployeeRelatedLiabilitiesCurrentAndNoncurrent_e9552012-2cdd-6f18-1259-b230036096ed" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AccountsPayableCurrentAndNoncurrent" xlink:label="loc_us-gaap_AccountsPayableCurrentAndNoncurrent_cd5b6b5f-6363-94f6-cd5c-b74bd87d0cd5" xlink:type="locator" />
    <link:calculationArc order="8" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_066608da-f041-4af6-3da0-95354b640e11" xlink:to="loc_us-gaap_AccountsPayableCurrentAndNoncurrent_cd5b6b5f-6363-94f6-cd5c-b74bd87d0cd5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AccruedIncomeTaxes" xlink:label="loc_us-gaap_AccruedIncomeTaxes_c5504f4f-2b8d-c061-3954-298767913451" xlink:type="locator" />
    <link:calculationArc order="9" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_066608da-f041-4af6-3da0-95354b640e11" xlink:to="loc_us-gaap_AccruedIncomeTaxes_c5504f4f-2b8d-c061-3954-298767913451" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SecuredDebt" xlink:label="loc_us-gaap_SecuredDebt_07f69f5d-1693-d29d-ef9d-db0691482fe5" xlink:type="locator" />
    <link:calculationArc order="10" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_066608da-f041-4af6-3da0-95354b640e11" xlink:to="loc_us-gaap_SecuredDebt_07f69f5d-1693-d29d-ef9d-db0691482fe5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SubordinatedDebt" xlink:label="loc_us-gaap_SubordinatedDebt_09dd298a-e4ed-b05e-26af-e75d4775c837" xlink:type="locator" />
    <link:calculationArc order="11" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_066608da-f041-4af6-3da0-95354b640e11" xlink:to="loc_us-gaap_SubordinatedDebt_09dd298a-e4ed-b05e-26af-e75d4775c837" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DeferredTaxLiabilities" xlink:label="loc_us-gaap_DeferredTaxLiabilities_cee36967-7b64-56b0-03ea-66fbd4d14899" xlink:type="locator" />
    <link:calculationArc order="12" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_066608da-f041-4af6-3da0-95354b640e11" xlink:to="loc_us-gaap_DeferredTaxLiabilities_cee36967-7b64-56b0-03ea-66fbd4d14899" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DueToRelatedPartiesCurrentAndNoncurrent" xlink:label="loc_us-gaap_DueToRelatedPartiesCurrentAndNoncurrent_5e34c70c-f5d1-9f4f-6a98-2c740cf6f738" xlink:type="locator" />
    <link:calculationArc order="13" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_066608da-f041-4af6-3da0-95354b640e11" xlink:to="loc_us-gaap_DueToRelatedPartiesCurrentAndNoncurrent_5e34c70c-f5d1-9f4f-6a98-2c740cf6f738" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingLeaseLiability" xlink:label="loc_us-gaap_OperatingLeaseLiability_41784c6f-4555-af92-3354-8f8701c77f60" xlink:type="locator" />
    <link:calculationArc order="14" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_066608da-f041-4af6-3da0-95354b640e11" xlink:to="loc_us-gaap_OperatingLeaseLiability_41784c6f-4555-af92-3354-8f8701c77f60" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_Assets" xlink:label="loc_us-gaap_Assets_96dd7052-744e-d270-4e77-67944ec39152" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_32f41ea9-05c6-e713-464b-586a571d1c1f" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_96dd7052-744e-d270-4e77-67944ec39152" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_32f41ea9-05c6-e713-464b-586a571d1c1f" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DepositsWithClearingOrganizationsAndOthersSecurities" xlink:label="loc_us-gaap_DepositsWithClearingOrganizationsAndOthersSecurities_d8d6b1b9-edc8-1c90-74eb-f85a71644fc8" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_96dd7052-744e-d270-4e77-67944ec39152" xlink:to="loc_us-gaap_DepositsWithClearingOrganizationsAndOthersSecurities_d8d6b1b9-edc8-1c90-74eb-f85a71644fc8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ReceivablesFromBrokersDealersAndClearingOrganizations" xlink:label="loc_us-gaap_ReceivablesFromBrokersDealersAndClearingOrganizations_1138c238-1a5b-7e3b-0793-d46375d47d5e" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_96dd7052-744e-d270-4e77-67944ec39152" xlink:to="loc_us-gaap_ReceivablesFromBrokersDealersAndClearingOrganizations_1138c238-1a5b-7e3b-0793-d46375d47d5e" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ReceivablesFromCustomers" xlink:label="loc_us-gaap_ReceivablesFromCustomers_b7a42233-8df2-46e1-49f3-6a7094b055f8" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_96dd7052-744e-d270-4e77-67944ec39152" xlink:to="loc_us-gaap_ReceivablesFromCustomers_b7a42233-8df2-46e1-49f3-6a7094b055f8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncomeTaxesReceivable" xlink:label="loc_us-gaap_IncomeTaxesReceivable_ebb94f1a-1386-5eed-9402-f0f0e2cd300b" xlink:type="locator" />
    <link:calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_96dd7052-744e-d270-4e77-67944ec39152" xlink:to="loc_us-gaap_IncomeTaxesReceivable_ebb94f1a-1386-5eed-9402-f0f0e2cd300b" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SecuritiesPurchasedUnderAgreementsToResell" xlink:label="loc_us-gaap_SecuritiesPurchasedUnderAgreementsToResell_32c092b2-5770-2e33-90d4-db8f7126519c" xlink:type="locator" />
    <link:calculationArc order="6" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_96dd7052-744e-d270-4e77-67944ec39152" xlink:to="loc_us-gaap_SecuritiesPurchasedUnderAgreementsToResell_32c092b2-5770-2e33-90d4-db8f7126519c" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecurityOwned" xlink:label="loc_us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecurityOwned_02830d35-575e-9c17-22bc-1509b2d232e2" xlink:type="locator" />
    <link:calculationArc order="7" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_96dd7052-744e-d270-4e77-67944ec39152" xlink:to="loc_us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecurityOwned_02830d35-575e-9c17-22bc-1509b2d232e2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DueFromEmployees" xlink:label="loc_us-gaap_DueFromEmployees_94eee209-e291-2618-a564-bdb9e0ee3bfc" xlink:type="locator" />
    <link:calculationArc order="8" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_96dd7052-744e-d270-4e77-67944ec39152" xlink:to="loc_us-gaap_DueFromEmployees_94eee209-e291-2618-a564-bdb9e0ee3bfc" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_f37ad080-c77a-efc5-c936-389b16abc420" xlink:type="locator" />
    <link:calculationArc order="9" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_96dd7052-744e-d270-4e77-67944ec39152" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_f37ad080-c77a-efc5-c936-389b16abc420" xlink:type="arc" />
    <link:loc xlink:href="opy-20190331.xsd#opy_SubordinatedLoanReceivable" xlink:label="loc_opy_SubordinatedLoanReceivable_c6e22d1f-e06c-e1b5-e2e8-ed6463468fa8" xlink:type="locator" />
    <link:calculationArc order="10" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_96dd7052-744e-d270-4e77-67944ec39152" xlink:to="loc_opy_SubordinatedLoanReceivable_c6e22d1f-e06c-e1b5-e2e8-ed6463468fa8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_af012273-e8ee-655c-daa2-86b96989d377" xlink:type="locator" />
    <link:calculationArc order="11" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_96dd7052-744e-d270-4e77-67944ec39152" xlink:to="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_af012273-e8ee-655c-daa2-86b96989d377" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_Goodwill" xlink:label="loc_us-gaap_Goodwill_831ad0b9-9dba-3997-20e6-e99a19aa28db" xlink:type="locator" />
    <link:calculationArc order="12" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_96dd7052-744e-d270-4e77-67944ec39152" xlink:to="loc_us-gaap_Goodwill_831ad0b9-9dba-3997-20e6-e99a19aa28db" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OtherAssets" xlink:label="loc_us-gaap_OtherAssets_806083e9-63fa-5acf-a0c8-803a67715508" xlink:type="locator" />
    <link:calculationArc order="13" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_96dd7052-744e-d270-4e77-67944ec39152" xlink:to="loc_us-gaap_OtherAssets_806083e9-63fa-5acf-a0c8-803a67715508" xlink:type="arc" />
    <link:loc xlink:href="opy-20190331.xsd#opy_DeferredTaxAssetsIntercompany" xlink:label="loc_opy_DeferredTaxAssetsIntercompany_5dd7405c-4f61-4aef-25c1-ed6462bc36d6" xlink:type="locator" />
    <link:calculationArc order="14" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_96dd7052-744e-d270-4e77-67944ec39152" xlink:to="loc_opy_DeferredTaxAssetsIntercompany_5dd7405c-4f61-4aef-25c1-ed6462bc36d6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_InvestmentsInAndAdvancesToAffiliatesAmountOfEquity" xlink:label="loc_us-gaap_InvestmentsInAndAdvancesToAffiliatesAmountOfEquity_16151e74-c16b-5acf-7954-619153b12a40" xlink:type="locator" />
    <link:calculationArc order="15" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_96dd7052-744e-d270-4e77-67944ec39152" xlink:to="loc_us-gaap_InvestmentsInAndAdvancesToAffiliatesAmountOfEquity_16151e74-c16b-5acf-7954-619153b12a40" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DueFromRelatedParties" xlink:label="loc_us-gaap_DueFromRelatedParties_af303034-3a50-88ac-d097-e677d7f98615" xlink:type="locator" />
    <link:calculationArc order="16" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_96dd7052-744e-d270-4e77-67944ec39152" xlink:to="loc_us-gaap_DueFromRelatedParties_af303034-3a50-88ac-d097-e677d7f98615" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingLeaseRightOfUseAsset" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_52f5671e-53e6-6055-795e-6bd414fd86c2" xlink:type="locator" />
    <link:calculationArc order="17" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_96dd7052-744e-d270-4e77-67944ec39152" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAsset_52f5671e-53e6-6055-795e-6bd414fd86c2" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.opco.com/role/SupplementalGuarantorCondensedConsolidatedFinancialStatementsCondensedConsolidatingBalanceSheetDetailsCalc2" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquity" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_DB0A04AEC0E6DD5E42335646594E8F0A_63817d40-f759-fa9c-45a5-8bbbb36ed5c9" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_Liabilities" xlink:label="loc_us-gaap_Liabilities_DB0A04AEC0E6DD5E42335646594E8F0A_066608da-f041-4af6-3da0-95354b640e11" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_DB0A04AEC0E6DD5E42335646594E8F0A_63817d40-f759-fa9c-45a5-8bbbb36ed5c9" xlink:to="loc_us-gaap_Liabilities_DB0A04AEC0E6DD5E42335646594E8F0A_066608da-f041-4af6-3da0-95354b640e11" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StockholdersEquity" xlink:label="loc_us-gaap_StockholdersEquity_DB0A04AEC0E6DD5E42335646594E8F0A_6765f135-8c69-bebc-a116-d59a52a5b2f2" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_DB0A04AEC0E6DD5E42335646594E8F0A_63817d40-f759-fa9c-45a5-8bbbb36ed5c9" xlink:to="loc_us-gaap_StockholdersEquity_DB0A04AEC0E6DD5E42335646594E8F0A_6765f135-8c69-bebc-a116-d59a52a5b2f2" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.opco.com/role/SupplementalGuarantorCondensedConsolidatedFinancialStatementsCondensedConsolidatingStatementOfCashFlowsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_d8917e24-06dd-060d-a290-e426c7895e54" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PaymentsOfDividendsCommonStock" xlink:label="loc_us-gaap_PaymentsOfDividendsCommonStock_15de0c29-7f29-fc68-dcff-36f8e7ff06d8" xlink:type="locator" />
    <link:calculationArc order="1" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_d8917e24-06dd-060d-a290-e426c7895e54" xlink:to="loc_us-gaap_PaymentsOfDividendsCommonStock_15de0c29-7f29-fc68-dcff-36f8e7ff06d8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PaymentsForRepurchaseOfCommonStock" xlink:label="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_d4a92697-d008-996b-823a-bd9a56a04b3a" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_d8917e24-06dd-060d-a290-e426c7895e54" xlink:to="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_d4a92697-d008-996b-823a-bd9a56a04b3a" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation" xlink:label="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_43305c85-41ff-3d0f-c464-dc8983363bce" xlink:type="locator" />
    <link:calculationArc order="3" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_d8917e24-06dd-060d-a290-e426c7895e54" xlink:to="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_43305c85-41ff-3d0f-c464-dc8983363bce" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ProceedsFromPaymentsForOtherFinancingActivities" xlink:label="loc_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_38e7f3e2-9d1a-8772-e4aa-fb2cb7d8adc0" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_d8917e24-06dd-060d-a290-e426c7895e54" xlink:to="loc_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_38e7f3e2-9d1a-8772-e4aa-fb2cb7d8adc0" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.opco.com/role/SupplementalGuarantorCondensedConsolidatedFinancialStatementsCondensedConsolidatingStatementOfOperationsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTax" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTax_cf605d39-9067-2f07-a6b5-7dfa6481009e" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaap_NetIncomeLoss_a10eea14-f4db-3125-d183-77bb54500e95" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTax_cf605d39-9067-2f07-a6b5-7dfa6481009e" xlink:to="loc_us-gaap_NetIncomeLoss_a10eea14-f4db-3125-d183-77bb54500e95" xlink:type="arc" />
    <link:loc xlink:href="opy-20190331.xsd#opy_NetIncomeLossbeforeequityinEarningsofSubsidiaries" xlink:label="loc_opy_NetIncomeLossbeforeequityinEarningsofSubsidiaries_E9A9192E34E9B5BE146F56442379BAA0" xlink:type="locator" />
    <link:calculationArc order="1" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLoss_a10eea14-f4db-3125-d183-77bb54500e95" xlink:to="loc_opy_NetIncomeLossbeforeequityinEarningsofSubsidiaries_E9A9192E34E9B5BE146F56442379BAA0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions" xlink:label="loc_us-gaap_IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions_3c6689db-ce06-5ccf-9f05-b73e95c44396" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLoss_a10eea14-f4db-3125-d183-77bb54500e95" xlink:to="loc_us-gaap_IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions_3c6689db-ce06-5ccf-9f05-b73e95c44396" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_59645a08-ce25-9000-2f65-e4bfddb1182e" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTax_cf605d39-9067-2f07-a6b5-7dfa6481009e" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_59645a08-ce25-9000-2f65-e4bfddb1182e" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.opco.com/role/SupplementalGuarantorConsolidatedFinancialStatements" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.opco.com/role/SupplementalGuarantorConsolidatedFinancialStatementsTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.opco.com/role/VariableInterestEntities" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.opco.com/role/VariableInterestEntitiesDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_VariableInterestDifferenceBetweenCarryingAmountAndMaximumExposure" xlink:label="loc_us-gaap_VariableInterestDifferenceBetweenCarryingAmountAndMaximumExposure_86e8929a-7330-72c8-a67d-9f811c3f6e5a" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssets" xlink:label="loc_us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssets_d048319e-70ae-9517-1e5d-ce0931ba428e" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_VariableInterestDifferenceBetweenCarryingAmountAndMaximumExposure_86e8929a-7330-72c8-a67d-9f811c3f6e5a" xlink:to="loc_us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssets_d048319e-70ae-9517-1e5d-ce0931ba428e" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountLiabilities" xlink:label="loc_us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountLiabilities_595dc69d-47a9-1501-64ef-a7433ac6a8ac" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_VariableInterestDifferenceBetweenCarryingAmountAndMaximumExposure_86e8929a-7330-72c8-a67d-9f811c3f6e5a" xlink:to="loc_us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountLiabilities_595dc69d-47a9-1501-64ef-a7433ac6a8ac" xlink:type="arc" />
    <link:loc xlink:href="opy-20190331.xsd#opy_CapitalCommitments" xlink:label="loc_opy_CapitalCommitments_9870cc9f-a042-2def-30c3-ed64631baa7e" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_VariableInterestDifferenceBetweenCarryingAmountAndMaximumExposure_86e8929a-7330-72c8-a67d-9f811c3f6e5a" xlink:to="loc_opy_CapitalCommitments_9870cc9f-a042-2def-30c3-ed64631baa7e" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.opco.com/role/VariableInterestEntitiesTables" xlink:type="extended" />
</link:linkbase>
