<?xml version="1.0" encoding="us-ascii"?>
<!-- XBRL Generated with XBRLMark Copyright (C) by Bowne Inc. -->
<!-- Based on XBRL 2.1 -->
<!--Modified on: 8/10/2012 8:55:00 PM-->
<linkbase xmlns="http://www.xbrl.org/2003/linkbase" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xlink="http://www.w3.org/1999/xlink" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <roleRef xlink:type="simple" xlink:href="opy-20120630.xsd#DocumentAndEntityInformation" roleURI="http://opco.com/role/DocumentAndEntityInformation" />
  <roleRef xlink:type="simple" xlink:href="opy-20120630.xsd#StatementsOfChangesInEquity" roleURI="http://opco.com/role/StatementsOfChangesInEquity" />
  <roleRef xlink:type="simple" xlink:href="opy-20120630.xsd#StatementsOfChangesInEquityParenthetical" roleURI="http://opco.com/role/StatementsOfChangesInEquityParenthetical" />
  <roleRef xlink:type="simple" xlink:href="opy-20120630.xsd#SupplementalGuarantorFinancialStatements" roleURI="http://opco.com/role/SupplementalGuarantorFinancialStatements" />
  <roleRef xlink:type="simple" xlink:href="opy-20120630.xsd#RevisionToFinancialStatements" roleURI="http://opco.com/role/RevisionToFinancialStatements" />
  <roleRef xlink:type="simple" xlink:href="opy-20120630.xsd#SummaryOfSignificantAccountingPoliciesDetails" roleURI="http://opco.com/role/SummaryOfSignificantAccountingPoliciesDetails" />
  <roleRef xlink:type="simple" xlink:href="opy-20120630.xsd#NewAccountingPronouncementsPolicies" roleURI="http://opco.com/role/NewAccountingPronouncementsPolicies" />
  <roleRef xlink:type="simple" xlink:href="opy-20120630.xsd#RevisionToFinancialStatementsDetails" roleURI="http://opco.com/role/RevisionToFinancialStatementsDetails" />
  <roleRef xlink:type="simple" xlink:href="opy-20120630.xsd#ReceivableFromAndPayableToBrokersAndClearingOrganizationsTables" roleURI="http://opco.com/role/ReceivableFromAndPayableToBrokersAndClearingOrganizationsTables" />
  <roleRef xlink:type="simple" xlink:href="opy-20120630.xsd#ReceivableFromAndPayableToBrokersAndClearingOrganizationsDetails" roleURI="http://opco.com/role/ReceivableFromAndPayableToBrokersAndClearingOrganizationsDetails" />
  <roleRef xlink:type="simple" xlink:href="opy-20120630.xsd#FinancialInstrumentsDetails" roleURI="http://opco.com/role/FinancialInstrumentsDetails" />
  <roleRef xlink:type="simple" xlink:href="opy-20120630.xsd#FinancialInstrumentsTables" roleURI="http://opco.com/role/FinancialInstrumentsTables" />
  <roleRef xlink:type="simple" xlink:href="opy-20120630.xsd#FinancialInstrumentsDetails1" roleURI="http://opco.com/role/FinancialInstrumentsDetails1" />
  <roleRef xlink:type="simple" xlink:href="opy-20120630.xsd#FinancialInstrumentsDetails2" roleURI="http://opco.com/role/FinancialInstrumentsDetails2" />
  <roleRef xlink:type="simple" xlink:href="opy-20120630.xsd#FinancialInstrumentsDetails3" roleURI="http://opco.com/role/FinancialInstrumentsDetails3" />
  <roleRef xlink:type="simple" xlink:href="opy-20120630.xsd#FinancialInstrumentsDetails4" roleURI="http://opco.com/role/FinancialInstrumentsDetails4" />
  <roleRef xlink:type="simple" xlink:href="opy-20120630.xsd#FinancialInstrumentsDetails5" roleURI="http://opco.com/role/FinancialInstrumentsDetails5" />
  <roleRef xlink:type="simple" xlink:href="opy-20120630.xsd#FinancialInstrumentsDetails6" roleURI="http://opco.com/role/FinancialInstrumentsDetails6" />
  <roleRef xlink:type="simple" xlink:href="opy-20120630.xsd#FinancialInstrumentsDetails7" roleURI="http://opco.com/role/FinancialInstrumentsDetails7" />
  <roleRef xlink:type="simple" xlink:href="opy-20120630.xsd#LongTermDebtDetails" roleURI="http://opco.com/role/LongTermDebtDetails" />
  <roleRef xlink:type="simple" xlink:href="opy-20120630.xsd#LongTermDebtTables" roleURI="http://opco.com/role/LongTermDebtTables" />
  <roleRef xlink:type="simple" xlink:href="opy-20120630.xsd#LongTermDebtDetailsTextual" roleURI="http://opco.com/role/LongTermDebtDetailsTextual" />
  <roleRef xlink:type="simple" xlink:href="opy-20120630.xsd#ShareCapitalDetails" roleURI="http://opco.com/role/ShareCapitalDetails" />
  <roleRef xlink:type="simple" xlink:href="opy-20120630.xsd#ShareCapitalTables" roleURI="http://opco.com/role/ShareCapitalTables" />
  <roleRef xlink:type="simple" xlink:href="opy-20120630.xsd#SegmentInformationDetails" roleURI="http://opco.com/role/SegmentInformationDetails" />
  <roleRef xlink:type="simple" xlink:href="opy-20120630.xsd#SegmentInformationTables" roleURI="http://opco.com/role/SegmentInformationTables" />
  <roleRef xlink:type="simple" xlink:href="opy-20120630.xsd#SegmentInformationDetails1" roleURI="http://opco.com/role/SegmentInformationDetails1" />
  <roleRef xlink:type="simple" xlink:href="opy-20120630.xsd#SegmentInformationDetailsTextual" roleURI="http://opco.com/role/SegmentInformationDetailsTextual" />
  <roleRef xlink:type="simple" xlink:href="opy-20120630.xsd#SubsequentEventsDetailsTextual" roleURI="http://opco.com/role/SubsequentEventsDetailsTextual" />
  <roleRef xlink:type="simple" xlink:href="opy-20120630.xsd#SupplementalGuarantorFinancialStatementsDetails1" roleURI="http://opco.com/role/SupplementalGuarantorFinancialStatementsDetails1" />
  <roleRef xlink:type="simple" xlink:href="opy-20120630.xsd#FinancialInstrumentsDetailsTextual" roleURI="http://opco.com/role/FinancialInstrumentsDetailsTextual" />
  <roleRef xlink:type="simple" xlink:href="opy-20120630.xsd#SupplementalGuarantorFinancialStatementsTables" roleURI="http://opco.com/role/SupplementalGuarantorFinancialStatementsTables" />
  <roleRef xlink:type="simple" xlink:href="opy-20120630.xsd#SupplementalGuarantorFinancialStatementsDetails" roleURI="http://opco.com/role/SupplementalGuarantorFinancialStatementsDetails" />
  <roleRef xlink:type="simple" xlink:href="opy-20120630.xsd#SupplementalGuarantorFinancialStatementsDetails2" roleURI="http://opco.com/role/SupplementalGuarantorFinancialStatementsDetails2" />
  <roleRef xlink:type="simple" xlink:href="opy-20120630.xsd#SupplementalGuarantorFinancialStatementsDetailsTextual" roleURI="http://opco.com/role/SupplementalGuarantorFinancialStatementsDetailsTextual" />
  <roleRef xlink:type="simple" xlink:href="opy-20120630.xsd#ShareCapitalDetailsTextual" roleURI="http://opco.com/role/ShareCapitalDetailsTextual" />
  <roleRef xlink:type="simple" xlink:href="opy-20120630.xsd#RegulatoryRequirements" roleURI="http://opco.com/role/RegulatoryRequirements" />
  <roleRef xlink:type="simple" xlink:href="opy-20120630.xsd#EarningsPerShare" roleURI="http://opco.com/role/EarningsPerShare" />
  <roleRef xlink:type="simple" xlink:href="opy-20120630.xsd#EarningsPerShareTables" roleURI="http://opco.com/role/EarningsPerShareTables" />
  <roleRef xlink:type="simple" xlink:href="opy-20120630.xsd#EarningsPerShareDetails" roleURI="http://opco.com/role/EarningsPerShareDetails" />
  <roleRef xlink:type="simple" xlink:href="opy-20120630.xsd#EarningsPerShareDetailsTextual" roleURI="http://opco.com/role/EarningsPerShareDetailsTextual" />
  <roleRef xlink:type="simple" xlink:href="opy-20120630.xsd#FinancialInstrumentsDetails8" roleURI="http://opco.com/role/FinancialInstrumentsDetails8" />
  <roleRef xlink:type="simple" xlink:href="opy-20120630.xsd#RegulatoryRequirementsDetails" roleURI="http://opco.com/role/RegulatoryRequirementsDetails" />
  <calculationLink xlink:type="extended" xlink:role="http://opco.com/role/DocumentAndEntityInformation" xlink:title="00 - Document - Document and Entity Information" />
  <roleRef roleURI="http://opco.com/role/BalanceSheets" xlink:href="opy-20120630.xsd#BalanceSheets" xlink:type="simple" />
  <roleRef roleURI="http://opco.com/role/BalanceSheetsParenthetical" xlink:href="opy-20120630.xsd#BalanceSheetsParenthetical" xlink:type="simple" />
  <roleRef roleURI="http://opco.com/role/StatementsOfOperations" xlink:href="opy-20120630.xsd#StatementsOfOperations" xlink:type="simple" />
  <roleRef roleURI="http://opco.com/role/StatementsOfComprehensiveIncome" xlink:href="opy-20120630.xsd#StatementsOfComprehensiveIncome" xlink:type="simple" />
  <roleRef roleURI="http://opco.com/role/StatementsOfCashFlows" xlink:href="opy-20120630.xsd#StatementsOfCashFlows" xlink:type="simple" />
  <calculationLink xlink:role="http://opco.com/role/BalanceSheets" xlink:title="0110 - Statement - Condensed Consolidated Balance Sheets (Unaudited)" xlink:type="extended">
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_Assets" xlink:label="loc_Assets" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="loc_CashAndCashEquivalentsAtCarryingValue" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_Assets" xlink:to="loc_CashAndCashEquivalentsAtCarryingValue" order="20" use="optional" weight="1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CashAndSecuritiesSegregatedUnderFederalAndOtherRegulations" xlink:label="loc_CashAndSecuritiesSegregatedUnderFederalAndOtherRegulations" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_Assets" xlink:to="loc_CashAndSecuritiesSegregatedUnderFederalAndOtherRegulations" order="40" use="optional" weight="1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DepositsWithClearingOrganizationsAndOthersSecurities" xlink:label="loc_DepositsWithClearingOrganizationsAndOthersSecurities" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_Assets" xlink:to="loc_DepositsWithClearingOrganizationsAndOthersSecurities" order="60" use="optional" weight="1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ReceivablesFromBrokersDealersAndClearingOrganizations" xlink:label="loc_ReceivablesFromBrokersDealersAndClearingOrganizations" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_Assets" xlink:to="loc_ReceivablesFromBrokersDealersAndClearingOrganizations" order="80" use="optional" weight="1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ReceivablesFromCustomers" xlink:label="loc_ReceivablesFromCustomers" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_Assets" xlink:to="loc_ReceivablesFromCustomers" order="100" use="optional" weight="1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_IncomeTaxesReceivable" xlink:label="loc_IncomeTaxesReceivable" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_Assets" xlink:to="loc_IncomeTaxesReceivable" order="120" use="optional" weight="1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_SecuritiesPurchasedUnderAgreementsToResell" xlink:label="loc_SecuritiesPurchasedUnderAgreementsToResell" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_Assets" xlink:to="loc_SecuritiesPurchasedUnderAgreementsToResell" order="140" use="optional" weight="1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FinancialInstrumentsOwnedAtFairValue" xlink:label="loc_FinancialInstrumentsOwnedAtFairValue" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_Assets" xlink:to="loc_FinancialInstrumentsOwnedAtFairValue" order="160" use="optional" weight="1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:label="loc_PropertyPlantAndEquipmentNet" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_Assets" xlink:to="loc_PropertyPlantAndEquipmentNet" order="200" use="optional" weight="1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill" xlink:label="loc_IntangibleAssetsNetExcludingGoodwill" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_Assets" xlink:to="loc_IntangibleAssetsNetExcludingGoodwill" order="240" use="optional" weight="1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_Goodwill" xlink:label="loc_Goodwill" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_Assets" xlink:to="loc_Goodwill" order="260" use="optional" weight="1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_OtherAssets" xlink:label="loc_OtherAssets" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_Assets" xlink:to="loc_OtherAssets" order="280" use="optional" weight="1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_Liabilities" xlink:label="loc_Liabilities" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DraftsPayable" xlink:label="loc_DraftsPayable" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_Liabilities" xlink:to="loc_DraftsPayable" order="20" use="optional" weight="1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BankLoans" xlink:label="loc_BankLoans" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_Liabilities" xlink:to="loc_BankLoans" order="40" use="optional" weight="1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_PayablesToBrokerDealersAndClearingOrganizations" xlink:label="loc_PayablesToBrokerDealersAndClearingOrganizations" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_Liabilities" xlink:to="loc_PayablesToBrokerDealersAndClearingOrganizations" order="60" use="optional" weight="1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_PayablesToCustomers" xlink:label="loc_PayablesToCustomers" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_Liabilities" xlink:to="loc_PayablesToCustomers" order="80" use="optional" weight="1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_SecuritiesSoldUnderAgreementsToRepurchase" xlink:label="loc_SecuritiesSoldUnderAgreementsToRepurchase" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_Liabilities" xlink:to="loc_SecuritiesSoldUnderAgreementsToRepurchase" order="100" use="optional" weight="1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecuritySoldNotYetPurchased" xlink:label="loc_SecurityOwnedAndSoldNotYetPurchasedFairValueSecuritySoldNotYetPurchased" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_Liabilities" xlink:to="loc_SecurityOwnedAndSoldNotYetPurchasedFairValueSecuritySoldNotYetPurchased" order="120" use="optional" weight="1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_EmployeeRelatedLiabilitiesCurrentAndNoncurrent" xlink:label="loc_EmployeeRelatedLiabilitiesCurrentAndNoncurrent" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_Liabilities" xlink:to="loc_EmployeeRelatedLiabilitiesCurrentAndNoncurrent" order="140" use="optional" weight="1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DeferredIncomeTaxLiabilities" xlink:label="loc_DeferredIncomeTaxLiabilities" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_Liabilities" xlink:to="loc_DeferredIncomeTaxLiabilities" order="180" use="optional" weight="1" />
    <loc xlink:type="locator" xlink:href="opy-20120630.xsd#opy_ExcessOfFairValueOfAcquiredAssetsOverCost" xlink:label="opy_ExcessOfFairValueOfAcquiredAssetsOverCost" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_Liabilities" xlink:to="opy_ExcessOfFairValueOfAcquiredAssetsOverCost" order="240" use="optional" weight="1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquity" xlink:label="loc_LiabilitiesAndStockholdersEquity" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_LiabilitiesAndStockholdersEquity" xlink:to="loc_Liabilities" order="20" use="optional" weight="1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StockholdersEquity" xlink:label="loc_StockholdersEquity" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CommonStockValue" xlink:label="loc_CommonStockValue" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_StockholdersEquity" xlink:to="loc_CommonStockValue" order="20" use="optional" weight="1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AdditionalPaidInCapitalCommonStock" xlink:label="loc_AdditionalPaidInCapitalCommonStock" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_StockholdersEquity" xlink:to="loc_AdditionalPaidInCapitalCommonStock" order="40" use="optional" weight="1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_RetainedEarningsAccumulatedDeficit" xlink:label="loc_RetainedEarningsAccumulatedDeficit" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_StockholdersEquity" xlink:to="loc_RetainedEarningsAccumulatedDeficit" order="60" use="optional" weight="1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax" xlink:label="loc_AccumulatedOtherComprehensiveIncomeLossNetOfTax" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_StockholdersEquity" xlink:to="loc_AccumulatedOtherComprehensiveIncomeLossNetOfTax" order="80" use="optional" weight="1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" xlink:label="loc_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" xlink:to="loc_StockholdersEquity" order="20" use="optional" weight="1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_MinorityInterest" xlink:label="loc_MinorityInterest" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" xlink:to="loc_MinorityInterest" order="40" use="optional" weight="1" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_LiabilitiesAndStockholdersEquity" xlink:to="loc_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" order="40" use="optional" weight="1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AccountsPayableCurrentAndNoncurrent" xlink:label="loc_AccountsPayableCurrentAndNoncurrent" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_Liabilities" xlink:to="loc_AccountsPayableCurrentAndNoncurrent" order="150" use="optional" weight="1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DueFromEmployees" xlink:label="loc_DueFromEmployees" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_Assets" xlink:to="loc_DueFromEmployees" order="180" use="optional" weight="1" priority="1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_SecuredDebt" xlink:label="loc_SecuredDebt" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_Liabilities" xlink:to="loc_SecuredDebt" order="165" use="optional" weight="1" />
  </calculationLink>
  <calculationLink xlink:role="http://opco.com/role/StatementsOfOperations" xlink:title="0120 - Statement - Condensed Consolidated Statements of Operations (Unaudited)" xlink:type="extended">
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_Revenues" xlink:label="loc_Revenues" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BrokerageCommissionsRevenue" xlink:label="loc_BrokerageCommissionsRevenue" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_Revenues" xlink:to="loc_BrokerageCommissionsRevenue" order="20" use="optional" weight="1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_PrincipalTransactionsRevenue" xlink:label="loc_PrincipalTransactionsRevenue" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_Revenues" xlink:to="loc_PrincipalTransactionsRevenue" order="40" use="optional" weight="1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_InterestIncomeOperating" xlink:label="loc_InterestIncomeOperating" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_Revenues" xlink:to="loc_InterestIncomeOperating" order="60" use="optional" weight="1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_InvestmentBankingRevenue" xlink:label="loc_InvestmentBankingRevenue" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_Revenues" xlink:to="loc_InvestmentBankingRevenue" order="80" use="optional" weight="1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_InvestmentAdvisoryFees" xlink:label="loc_InvestmentAdvisoryFees" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_Revenues" xlink:to="loc_InvestmentAdvisoryFees" order="100" use="optional" weight="1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_OtherIncome" xlink:label="loc_OtherIncome" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_Revenues" xlink:to="loc_OtherIncome" order="120" use="optional" weight="1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments" xlink:label="loc_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments" xlink:to="loc_Revenues" order="20" use="optional" weight="1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_OperatingExpenses" xlink:label="loc_OperatingExpenses" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LaborAndRelatedExpense" xlink:label="loc_LaborAndRelatedExpense" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_OperatingExpenses" xlink:to="loc_LaborAndRelatedExpense" order="20" use="optional" weight="1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FloorBrokerageExchangeAndClearanceFees" xlink:label="loc_FloorBrokerageExchangeAndClearanceFees" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_OperatingExpenses" xlink:to="loc_FloorBrokerageExchangeAndClearanceFees" order="40" use="optional" weight="1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CommunicationsAndInformationTechnology" xlink:label="loc_CommunicationsAndInformationTechnology" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_OperatingExpenses" xlink:to="loc_CommunicationsAndInformationTechnology" order="60" use="optional" weight="1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_OccupancyNet" xlink:label="loc_OccupancyNet" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_OperatingExpenses" xlink:to="loc_OccupancyNet" order="80" use="optional" weight="1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_InterestExpense" xlink:label="loc_InterestExpense" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_OperatingExpenses" xlink:to="loc_InterestExpense" order="100" use="optional" weight="1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_OtherExpenses" xlink:label="loc_OtherExpenses" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_OperatingExpenses" xlink:to="loc_OtherExpenses" order="120" use="optional" weight="1" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments" xlink:to="loc_OperatingExpenses" order="40" use="optional" weight="-1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ProfitLoss" xlink:label="loc_ProfitLoss" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ProfitLoss" xlink:to="loc_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments" order="20" use="optional" weight="1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit" xlink:label="loc_IncomeTaxExpenseBenefit" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ProfitLoss" xlink:to="loc_IncomeTaxExpenseBenefit" order="40" use="optional" weight="-1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_NetIncomeLoss" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_NetIncomeLoss" xlink:to="loc_ProfitLoss" order="20" use="optional" weight="1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_NetIncomeLossAttributableToNoncontrollingInterest" xlink:label="loc_NetIncomeLossAttributableToNoncontrollingInterest" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_NetIncomeLoss" xlink:to="loc_NetIncomeLossAttributableToNoncontrollingInterest" order="40" use="optional" weight="-1" />
  </calculationLink>
  <calculationLink xlink:role="http://opco.com/role/StatementsOfComprehensiveIncome" xlink:title="0130 - Statement - Condensed Consolidated Statements Of Comprehensive Income (Loss) (Unaudited)" xlink:type="extended">
  </calculationLink>
  <calculationLink xlink:role="http://opco.com/role/StatementsOfCashFlows" xlink:title="0140 - Statement - Condensed Consolidated Statements of Cash Flows (Unaudited)" xlink:type="extended">
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:label="loc_NetCashProvidedByUsedInOperatingActivities" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ProfitLoss" xlink:label="loc_ProfitLoss" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_NetCashProvidedByUsedInOperatingActivities" xlink:to="loc_ProfitLoss" order="20" use="optional" weight="1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DepreciationAmortizationAndAccretionNet" xlink:label="loc_DepreciationAmortizationAndAccretionNet" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_NetCashProvidedByUsedInOperatingActivities" xlink:to="loc_DepreciationAmortizationAndAccretionNet" order="40" use="optional" weight="1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DeferredIncomeTaxExpenseBenefit" xlink:label="loc_DeferredIncomeTaxExpenseBenefit" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_NetCashProvidedByUsedInOperatingActivities" xlink:to="loc_DeferredIncomeTaxExpenseBenefit" order="60" use="optional" weight="1" />
    <loc xlink:type="locator" xlink:href="opy-20120630.xsd#opy_AmortizationOfNotesReceivable" xlink:label="opy_AmortizationOfNotesReceivable" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_NetCashProvidedByUsedInOperatingActivities" xlink:to="opy_AmortizationOfNotesReceivable" order="80" use="optional" weight="1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AmortizationOfFinancingCosts" xlink:label="loc_AmortizationOfFinancingCosts" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_NetCashProvidedByUsedInOperatingActivities" xlink:to="loc_AmortizationOfFinancingCosts" order="100" use="optional" weight="1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AmortizationOfIntangibleAssets" xlink:label="loc_AmortizationOfIntangibleAssets" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_NetCashProvidedByUsedInOperatingActivities" xlink:to="loc_AmortizationOfIntangibleAssets" order="120" use="optional" weight="1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShareBasedCompensation" xlink:label="loc_ShareBasedCompensation" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_NetCashProvidedByUsedInOperatingActivities" xlink:to="loc_ShareBasedCompensation" order="160" use="optional" weight="1" />
    <loc xlink:type="locator" xlink:href="opy-20120630.xsd#opy_IncreaseDecreaseDepositsWithClearingOrganizations" xlink:label="opy_IncreaseDecreaseDepositsWithClearingOrganizations" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_NetCashProvidedByUsedInOperatingActivities" xlink:to="opy_IncreaseDecreaseDepositsWithClearingOrganizations" order="200" use="optional" weight="-1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_IncreaseDecreaseInBrokerageReceivables" xlink:label="loc_IncreaseDecreaseInBrokerageReceivables" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_NetCashProvidedByUsedInOperatingActivities" xlink:to="loc_IncreaseDecreaseInBrokerageReceivables" order="220" use="optional" weight="-1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsAndOtherReceivables" xlink:label="loc_IncreaseDecreaseInAccountsAndOtherReceivables" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_NetCashProvidedByUsedInOperatingActivities" xlink:to="loc_IncreaseDecreaseInAccountsAndOtherReceivables" order="240" use="optional" weight="-1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_IncreaseDecreaseInIncomeTaxesReceivable" xlink:label="loc_IncreaseDecreaseInIncomeTaxesReceivable" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_NetCashProvidedByUsedInOperatingActivities" xlink:to="loc_IncreaseDecreaseInIncomeTaxesReceivable" order="260" use="optional" weight="-1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_IncreaseDecreaseInReceivablesUnderRepurchaseAgreements" xlink:label="loc_IncreaseDecreaseInReceivablesUnderRepurchaseAgreements" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_NetCashProvidedByUsedInOperatingActivities" xlink:to="loc_IncreaseDecreaseInReceivablesUnderRepurchaseAgreements" order="280" use="optional" weight="-1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_IncreaseDecreaseInFinancialInstrumentsUsedInOperatingActivities" xlink:label="loc_IncreaseDecreaseInFinancialInstrumentsUsedInOperatingActivities" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_NetCashProvidedByUsedInOperatingActivities" xlink:to="loc_IncreaseDecreaseInFinancialInstrumentsUsedInOperatingActivities" order="300" use="optional" weight="-1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_IncreaseDecreaseInNotesReceivables" xlink:label="loc_IncreaseDecreaseInNotesReceivables" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_NetCashProvidedByUsedInOperatingActivities" xlink:to="loc_IncreaseDecreaseInNotesReceivables" order="320" use="optional" weight="-1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_IncreaseDecreaseInOtherOperatingAssets" xlink:label="loc_IncreaseDecreaseInOtherOperatingAssets" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_NetCashProvidedByUsedInOperatingActivities" xlink:to="loc_IncreaseDecreaseInOtherOperatingAssets" order="340" use="optional" weight="-1" />
    <loc xlink:type="locator" xlink:href="opy-20120630.xsd#opy_IncreaseDecreaseInDraftPayable" xlink:label="opy_IncreaseDecreaseInDraftPayable" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_NetCashProvidedByUsedInOperatingActivities" xlink:to="opy_IncreaseDecreaseInDraftPayable" order="360" use="optional" weight="1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_IncreaseDecreaseInPayablesToBrokerDealers" xlink:label="loc_IncreaseDecreaseInPayablesToBrokerDealers" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_NetCashProvidedByUsedInOperatingActivities" xlink:to="loc_IncreaseDecreaseInPayablesToBrokerDealers" order="380" use="optional" weight="1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_IncreaseDecreaseInPayablesUnderRepurchaseAgreements" xlink:label="loc_IncreaseDecreaseInPayablesUnderRepurchaseAgreements" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_NetCashProvidedByUsedInOperatingActivities" xlink:to="loc_IncreaseDecreaseInPayablesUnderRepurchaseAgreements" order="420" use="optional" weight="1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_IncreaseDecreaseInFinancialInstrumentsSoldNotYetPurchased" xlink:label="loc_IncreaseDecreaseInFinancialInstrumentsSoldNotYetPurchased" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_NetCashProvidedByUsedInOperatingActivities" xlink:to="loc_IncreaseDecreaseInFinancialInstrumentsSoldNotYetPurchased" order="440" use="optional" weight="1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities" xlink:label="loc_IncreaseDecreaseInEmployeeRelatedLiabilities" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_NetCashProvidedByUsedInOperatingActivities" xlink:to="loc_IncreaseDecreaseInEmployeeRelatedLiabilities" order="460" use="optional" weight="1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities" xlink:label="loc_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_NetCashProvidedByUsedInOperatingActivities" xlink:to="loc_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities" order="480" use="optional" weight="1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease" xlink:label="loc_CashAndCashEquivalentsPeriodIncreaseDecrease" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_CashAndCashEquivalentsPeriodIncreaseDecrease" xlink:to="loc_NetCashProvidedByUsedInOperatingActivities" order="20" use="optional" weight="1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities" xlink:label="loc_NetCashProvidedByUsedInInvestingActivities" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment" xlink:label="loc_PaymentsToAcquirePropertyPlantAndEquipment" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_NetCashProvidedByUsedInInvestingActivities" xlink:to="loc_PaymentsToAcquirePropertyPlantAndEquipment" order="20" use="optional" weight="-1" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_CashAndCashEquivalentsPeriodIncreaseDecrease" xlink:to="loc_NetCashProvidedByUsedInInvestingActivities" order="40" use="optional" weight="1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities" xlink:label="loc_NetCashProvidedByUsedInFinancingActivities" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_PaymentsOfDividendsCommonStock" xlink:label="loc_PaymentsOfDividendsCommonStock" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_NetCashProvidedByUsedInFinancingActivities" xlink:to="loc_PaymentsOfDividendsCommonStock" order="20" use="optional" weight="-1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ProceedsFromIssuanceOfCommonStock" xlink:label="loc_ProceedsFromIssuanceOfCommonStock" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_NetCashProvidedByUsedInFinancingActivities" xlink:to="loc_ProceedsFromIssuanceOfCommonStock" order="40" use="optional" weight="1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities" xlink:label="loc_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_NetCashProvidedByUsedInFinancingActivities" xlink:to="loc_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities" order="80" use="optional" weight="1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_RepaymentsOfNotesPayable" xlink:label="loc_RepaymentsOfNotesPayable" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_NetCashProvidedByUsedInFinancingActivities" xlink:to="loc_RepaymentsOfNotesPayable" order="100" use="optional" weight="-1" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_CashAndCashEquivalentsPeriodIncreaseDecrease" xlink:to="loc_NetCashProvidedByUsedInFinancingActivities" order="60" use="optional" weight="1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_RepaymentsOfSubordinatedDebt" xlink:label="loc_RepaymentsOfSubordinatedDebt" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_NetCashProvidedByUsedInFinancingActivities" xlink:to="loc_RepaymentsOfSubordinatedDebt" order="110" use="optional" weight="-1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ProceedsFromIssuanceOfSecuredDebt" xlink:label="loc_ProceedsFromIssuanceOfSecuredDebt" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_NetCashProvidedByUsedInFinancingActivities" xlink:to="loc_ProceedsFromIssuanceOfSecuredDebt" order="90" use="optional" weight="1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ProvisionForOtherCreditLosses" xlink:label="loc_ProvisionForOtherCreditLosses" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_NetCashProvidedByUsedInOperatingActivities" xlink:to="loc_ProvisionForOtherCreditLosses" order="130" use="optional" weight="1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_IncreaseDecreaseInPayablesToCustomers" xlink:label="loc_IncreaseDecreaseInPayablesToCustomers" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_NetCashProvidedByUsedInOperatingActivities" xlink:to="loc_IncreaseDecreaseInPayablesToCustomers" order="400" use="optional" weight="1" />
    <loc xlink:type="locator" xlink:href="opy-20120630.xsd#opy_IncreaseDecreaseInCashAndSecuritiesSegregatedForRegulatoryAndOtherPurposes" xlink:label="opy_IncreaseDecreaseInCashAndSecuritiesSegregatedForRegulatoryAndOtherPurposes" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_NetCashProvidedByUsedInOperatingActivities" xlink:to="opy_IncreaseDecreaseInCashAndSecuritiesSegregatedForRegulatoryAndOtherPurposes" order="190" use="optional" weight="-1" priority="1" />
    <loc xlink:type="locator" xlink:href="opy-20120630.xsd#opy_IncreaseDecreaseInBankCallLoansNet" xlink:label="opy_IncreaseDecreaseInBankCallLoansNet" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_NetCashProvidedByUsedInFinancingActivities" xlink:to="opy_IncreaseDecreaseInBankCallLoansNet" order="140" use="optional" weight="-1" priority="1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_PaymentsForRepurchaseOfCommonStock" xlink:label="loc_PaymentsForRepurchaseOfCommonStock" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_NetCashProvidedByUsedInFinancingActivities" xlink:to="loc_PaymentsForRepurchaseOfCommonStock" order="60" use="optional" weight="-1" />
  </calculationLink>
  <roleRef xlink:type="simple" xlink:href="opy-20120630.xsd#SummaryOfSignificantAccountingPolicies" roleURI="http://opco.com/role/SummaryOfSignificantAccountingPolicies" />
  <calculationLink xlink:type="extended" xlink:role="http://opco.com/role/SummaryOfSignificantAccountingPolicies" xlink:title="0201 - Disclosure - Summary of Significant Accounting Policies" />
  <roleRef xlink:type="simple" xlink:href="opy-20120630.xsd#NewAccountingPronouncements" roleURI="http://opco.com/role/NewAccountingPronouncements" />
  <calculationLink xlink:type="extended" xlink:role="http://opco.com/role/NewAccountingPronouncements" xlink:title="0202 - Disclosure - New Accounting Pronouncements" />
  <roleRef xlink:type="simple" xlink:href="opy-20120630.xsd#ReceivableFromAndPayableToBrokersAndClearingOrganizations" roleURI="http://opco.com/role/ReceivableFromAndPayableToBrokersAndClearingOrganizations" />
  <calculationLink xlink:type="extended" xlink:role="http://opco.com/role/ReceivableFromAndPayableToBrokersAndClearingOrganizations" xlink:title="0205 - Disclosure - Receivable from and Payable to Brokers and Clearing Organizations" />
  <roleRef xlink:type="simple" xlink:href="opy-20120630.xsd#FinancialInstruments" roleURI="http://opco.com/role/FinancialInstruments" />
  <calculationLink xlink:type="extended" xlink:role="http://opco.com/role/FinancialInstruments" xlink:title="0206 - Disclosure - Financial Instruments" />
  <roleRef xlink:type="simple" xlink:href="opy-20120630.xsd#LongTermDebt" roleURI="http://opco.com/role/LongTermDebt" />
  <calculationLink xlink:type="extended" xlink:role="http://opco.com/role/LongTermDebt" xlink:title="0207 - Disclosure - Long-Term Debt" />
  <roleRef xlink:type="simple" xlink:href="opy-20120630.xsd#ShareCapital" roleURI="http://opco.com/role/ShareCapital" />
  <calculationLink xlink:type="extended" xlink:role="http://opco.com/role/ShareCapital" xlink:title="0208 - Disclosure - Share Capital" />
  <roleRef xlink:type="simple" xlink:href="opy-20120630.xsd#RelatedPartyTransactions" roleURI="http://opco.com/role/RelatedPartyTransactions" />
  <calculationLink xlink:type="extended" xlink:role="http://opco.com/role/RelatedPartyTransactions" xlink:title="0210 - Disclosure - Related Party Transactions" />
  <roleRef xlink:type="simple" xlink:href="opy-20120630.xsd#SegmentInformation" roleURI="http://opco.com/role/SegmentInformation" />
  <calculationLink xlink:type="extended" xlink:role="http://opco.com/role/SegmentInformation" xlink:title="0211 - Disclosure - Segment Information" />
  <roleRef xlink:type="simple" xlink:href="opy-20120630.xsd#SubsequentEvents" roleURI="http://opco.com/role/SubsequentEvents" />
  <calculationLink xlink:type="extended" xlink:role="http://opco.com/role/SubsequentEvents" xlink:title="0212 - Disclosure - Subsequent Events" />
  <calculationLink xlink:type="extended" xlink:role="http://opco.com/role/StatementsOfChangesInEquity" xlink:title="0150 - Statement - Condensed Consolidated Statements of Changes in Equity (Unaudited)">
  </calculationLink>
  <calculationLink xlink:type="extended" xlink:role="http://opco.com/role/StatementsOfChangesInEquityParenthetical" xlink:title="0151 - Statement - Condensed Consolidated Statements of Changes in Equity (Parenthetical) (Unaudited)" />
  <calculationLink xlink:type="extended" xlink:role="http://opco.com/role/SupplementalGuarantorFinancialStatements" xlink:title="0213 - Disclosure -  Supplemental Guarantor Condensed Consolidated Financial Statements">
  </calculationLink>
  <calculationLink xlink:type="extended" xlink:role="http://opco.com/role/RevisionToFinancialStatements" xlink:title="0203 - Disclosure - Revision to Financial Statements">
  </calculationLink>
  <calculationLink xlink:type="extended" xlink:role="http://opco.com/role/BalanceSheetsParenthetical" xlink:title="0111 - Statement - Condensed Consolidated Balance Sheets (Parenthetical) (Unaudited)" />
  <calculationLink xlink:type="extended" xlink:role="http://opco.com/role/SummaryOfSignificantAccountingPoliciesDetails" xlink:title="0601 - Disclosure - Summary of Significant Accounting Policies (Details)" />
  <calculationLink xlink:type="extended" xlink:role="http://opco.com/role/NewAccountingPronouncementsPolicies" xlink:title="0402 - Disclosure - New Accounting Pronouncements (Policies)" />
  <calculationLink xlink:type="extended" xlink:role="http://opco.com/role/RevisionToFinancialStatementsDetails" xlink:title="0603 - Disclosure - Revision to Financial Statements (Details)" />
  <calculationLink xlink:type="extended" xlink:role="http://opco.com/role/ReceivableFromAndPayableToBrokersAndClearingOrganizationsTables" xlink:title="0505 - Disclosure - Receivable from and Payable to Brokers and Clearing Organizations (Tables)" />
  <calculationLink xlink:type="extended" xlink:role="http://opco.com/role/ReceivableFromAndPayableToBrokersAndClearingOrganizationsDetails" xlink:title="0605 - Disclosure - Receivable from and Payable to Brokers and Clearing Organizations (Details)">
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ReceivablesFromBrokersDealersAndClearingOrganizations" xlink:label="loc_ReceivablesFromBrokersDealersAndClearingOrganizations" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_OtherReceivablesFromBrokerDealersAndClearingOrganizations" xlink:label="loc_OtherReceivablesFromBrokerDealersAndClearingOrganizations" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ReceivablesFromBrokersDealersAndClearingOrganizations" xlink:to="loc_OtherReceivablesFromBrokerDealersAndClearingOrganizations" order="20" use="optional" weight="1" priority="1" />
    <loc xlink:type="locator" xlink:href="opy-20120630.xsd#opy_OmnibusAccounts" xlink:label="opy_OmnibusAccounts" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ReceivablesFromBrokersDealersAndClearingOrganizations" xlink:to="opy_OmnibusAccounts" order="10" use="optional" weight="1" priority="1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ReceivablesFromClearingOrganizations" xlink:label="loc_ReceivablesFromClearingOrganizations" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ReceivablesFromBrokersDealersAndClearingOrganizations" xlink:to="loc_ReceivablesFromClearingOrganizations" order="5" use="optional" weight="1" priority="1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_SecuritiesFailedToDeliver" xlink:label="loc_SecuritiesFailedToDeliver" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ReceivablesFromBrokersDealersAndClearingOrganizations" xlink:to="loc_SecuritiesFailedToDeliver" order="2.5" use="optional" weight="1" priority="1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DueFromCorrespondentBrokers" xlink:label="loc_DueFromCorrespondentBrokers" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ReceivablesFromBrokersDealersAndClearingOrganizations" xlink:to="loc_DueFromCorrespondentBrokers" order="1.25" use="optional" weight="1" priority="1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DepositsPaidForSecuritiesBorrowedAtCarryingValue" xlink:label="loc_DepositsPaidForSecuritiesBorrowedAtCarryingValue" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ReceivablesFromBrokersDealersAndClearingOrganizations" xlink:to="loc_DepositsPaidForSecuritiesBorrowedAtCarryingValue" order="0.625" use="optional" weight="1" priority="1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_PayablesToBrokerDealersAndClearingOrganizations" xlink:label="loc_PayablesToBrokerDealersAndClearingOrganizations" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_OtherPayablesToBrokerDealersAndClearingOrganizations" xlink:label="loc_OtherPayablesToBrokerDealersAndClearingOrganizations" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_PayablesToBrokerDealersAndClearingOrganizations" xlink:to="loc_OtherPayablesToBrokerDealersAndClearingOrganizations" order="20" use="optional" weight="1" priority="1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_SecuritiesFailedToReceive" xlink:label="loc_SecuritiesFailedToReceive" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_PayablesToBrokerDealersAndClearingOrganizations" xlink:to="loc_SecuritiesFailedToReceive" order="10" use="optional" weight="1" priority="1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DepositsReceivedForSecuritiesLoanedAtCarryingValue" xlink:label="loc_DepositsReceivedForSecuritiesLoanedAtCarryingValue" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_PayablesToBrokerDealersAndClearingOrganizations" xlink:to="loc_DepositsReceivedForSecuritiesLoanedAtCarryingValue" order="5" use="optional" weight="1" priority="1" />
  </calculationLink>
  <calculationLink xlink:type="extended" xlink:role="http://opco.com/role/FinancialInstrumentsDetails" xlink:title="0606 - Disclosure - Financial Instruments (Details)" />
  <calculationLink xlink:type="extended" xlink:role="http://opco.com/role/FinancialInstrumentsTables" xlink:title="0506 - Disclosure - Financial Instruments (Tables)" />
  <calculationLink xlink:type="extended" xlink:role="http://opco.com/role/FinancialInstrumentsDetails1" xlink:title="06061 - Disclosure - Financial Instruments (Details 1)" />
  <calculationLink xlink:type="extended" xlink:role="http://opco.com/role/FinancialInstrumentsDetails2" xlink:title="06062 - Disclosure - Financial Instruments (Details 2)">
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AssetsFairValueDisclosure" xlink:label="loc_AssetsFairValueDisclosure" />
    <loc xlink:type="locator" xlink:href="opy-20120630.xsd#opy_FairValuePurchasesOfToBeAnnouncedSecurities" xlink:label="opy_FairValuePurchasesOfToBeAnnouncedSecurities" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_AssetsFairValueDisclosure" xlink:to="opy_FairValuePurchasesOfToBeAnnouncedSecurities" order="10" use="optional" weight="1" priority="1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DerivativeAssets" xlink:label="loc_DerivativeAssets" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_AssetsFairValueDisclosure" xlink:to="loc_DerivativeAssets" order="5" use="optional" weight="1" priority="1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_InvestmentsFairValueDisclosure" xlink:label="loc_InvestmentsFairValueDisclosure" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_AssetsFairValueDisclosure" xlink:to="loc_InvestmentsFairValueDisclosure" order="2.5" use="optional" weight="1" priority="1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_MarketableSecurities" xlink:label="loc_MarketableSecurities" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_AssetsFairValueDisclosure" xlink:to="loc_MarketableSecurities" order="1.25" use="optional" weight="1" priority="1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LiabilitiesFairValueDisclosure" xlink:label="loc_LiabilitiesFairValueDisclosure" />
    <loc xlink:type="locator" xlink:href="opy-20120630.xsd#opy_FairValueSaleOfToBeAnnouncedSecurities" xlink:label="opy_FairValueSaleOfToBeAnnouncedSecurities" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_LiabilitiesFairValueDisclosure" xlink:to="opy_FairValueSaleOfToBeAnnouncedSecurities" order="40" use="optional" weight="1" priority="1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DerivativeLiabilities" xlink:label="loc_DerivativeLiabilities" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_LiabilitiesFairValueDisclosure" xlink:to="loc_DerivativeLiabilities" order="60" use="optional" weight="1" priority="1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LiabilitiesRelatedToInvestmentContractsFairValueDisclosure" xlink:label="loc_LiabilitiesRelatedToInvestmentContractsFairValueDisclosure" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_LiabilitiesFairValueDisclosure" xlink:to="loc_LiabilitiesRelatedToInvestmentContractsFairValueDisclosure" order="80" use="optional" weight="1" priority="1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_SecuritiesSoldNotYetPurchasedFairValueDisclosure" xlink:label="loc_SecuritiesSoldNotYetPurchasedFairValueDisclosure" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_LiabilitiesFairValueDisclosure" xlink:to="loc_SecuritiesSoldNotYetPurchasedFairValueDisclosure" order="100" use="optional" weight="1" priority="1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FederalFundsSoldAndSecuritiesBorrowedOrPurchasedUnderAgreementsToResellFairValueDisclosure" xlink:label="loc_FederalFundsSoldAndSecuritiesBorrowedOrPurchasedUnderAgreementsToResellFairValueDisclosure" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_AssetsFairValueDisclosure" xlink:to="loc_FederalFundsSoldAndSecuritiesBorrowedOrPurchasedUnderAgreementsToResellFairValueDisclosure" order="30" use="optional" weight="1" priority="1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_SecuritiesLoanedOrSoldUnderAgreementsToRepurchaseFairValueDisclosure" xlink:label="loc_SecuritiesLoanedOrSoldUnderAgreementsToRepurchaseFairValueDisclosure" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_LiabilitiesFairValueDisclosure" xlink:to="loc_SecuritiesLoanedOrSoldUnderAgreementsToRepurchaseFairValueDisclosure" order="45" use="optional" weight="1" priority="1" />
  </calculationLink>
  <calculationLink xlink:type="extended" xlink:role="http://opco.com/role/FinancialInstrumentsDetails3" xlink:title="06063 - Disclosure - Financial Instruments (Details 3)" />
  <calculationLink xlink:type="extended" xlink:role="http://opco.com/role/FinancialInstrumentsDetails4" xlink:title="06064 - Disclosure - Financial Instruments (Details 4)" />
  <calculationLink xlink:type="extended" xlink:role="http://opco.com/role/FinancialInstrumentsDetails5" xlink:title="06065 - Disclosure - Financial Instruments (Details 5)" />
  <calculationLink xlink:type="extended" xlink:role="http://opco.com/role/FinancialInstrumentsDetails6" xlink:title="06066 - Disclosure - Financial Instruments (Details 6)" />
  <calculationLink xlink:type="extended" xlink:role="http://opco.com/role/FinancialInstrumentsDetails7" xlink:title="06067 - Disclosure - Financial Instruments (Details 7)" />
  <calculationLink xlink:type="extended" xlink:role="http://opco.com/role/LongTermDebtDetails" xlink:title="0607 - Disclosure - Long-Term Debt (Details)" />
  <calculationLink xlink:type="extended" xlink:role="http://opco.com/role/LongTermDebtTables" xlink:title="0507 - Disclosure - Long-Term Debt (Tables)" />
  <calculationLink xlink:type="extended" xlink:role="http://opco.com/role/LongTermDebtDetailsTextual" xlink:title="06071 - Disclosure - Long-Term Debt (Details Textual)" />
  <calculationLink xlink:type="extended" xlink:role="http://opco.com/role/ShareCapitalDetails" xlink:title="0608 - Disclosure - Share Capital (Details)" />
  <calculationLink xlink:type="extended" xlink:role="http://opco.com/role/ShareCapitalTables" xlink:title="0508 - Disclosure - Share Capital (Tables)" />
  <calculationLink xlink:type="extended" xlink:role="http://opco.com/role/SegmentInformationDetails" xlink:title="0611 - Disclosure - Segment Information (Details)" />
  <calculationLink xlink:type="extended" xlink:role="http://opco.com/role/SegmentInformationTables" xlink:title="0511 - Disclosure - Segment Information (Tables)" />
  <calculationLink xlink:type="extended" xlink:role="http://opco.com/role/SegmentInformationDetails1" xlink:title="06111 - Disclosure - Segment Information (Details 1)" />
  <calculationLink xlink:type="extended" xlink:role="http://opco.com/role/SegmentInformationDetailsTextual" xlink:title="06112 - Disclosure - Segment Information (Details Textual)" />
  <calculationLink xlink:type="extended" xlink:role="http://opco.com/role/SubsequentEventsDetailsTextual" xlink:title="0612 - Disclosure - Subsequent Events (Details Textual)" />
  <calculationLink xlink:type="extended" xlink:role="http://opco.com/role/SupplementalGuarantorFinancialStatementsDetails1" xlink:title="06131 - Disclosure - Supplemental Guarantor Condensed Consolidated Financial Statements (Details 1)" />
  <calculationLink xlink:type="extended" xlink:role="http://opco.com/role/FinancialInstrumentsDetailsTextual" xlink:title="06069 - Disclosure - Financial Instruments (Details Textual)" />
  <calculationLink xlink:type="extended" xlink:role="http://opco.com/role/SupplementalGuarantorFinancialStatementsTables" xlink:title="0513 - Disclosure - Supplemental Guarantor Condensed Consolidated Financial Statements (Tables)" />
  <calculationLink xlink:type="extended" xlink:role="http://opco.com/role/SupplementalGuarantorFinancialStatementsDetails" xlink:title="0613 - Disclosure - Supplemental Guarantor Condensed Consolidated Financial Statements (Details)" />
  <calculationLink xlink:type="extended" xlink:role="http://opco.com/role/SupplementalGuarantorFinancialStatementsDetails2" xlink:title="06132 - Disclosure - Supplemental Guarantor Condensed Consolidated Financial Statements (Details 2)" />
  <calculationLink xlink:type="extended" xlink:role="http://opco.com/role/SupplementalGuarantorFinancialStatementsDetailsTextual" xlink:title="06133 - Disclosure - Supplemental Guarantor Condensed Consolidated Financial Statements (Details Textual)" />
  <calculationLink xlink:type="extended" xlink:role="http://opco.com/role/ShareCapitalDetailsTextual" xlink:title="06081 - Disclosure - Share Capital (Details Textual)" />
  <calculationLink xlink:type="extended" xlink:role="http://opco.com/role/RegulatoryRequirements" xlink:title="0209 - Disclosure - Regulatory Requirements" />
  <calculationLink xlink:type="extended" xlink:role="http://opco.com/role/EarningsPerShare" xlink:title="0204 - Disclosure - Earnings Per Share" />
  <calculationLink xlink:type="extended" xlink:role="http://opco.com/role/EarningsPerShareTables" xlink:title="0504 - Disclosure - Earnings Per Share (Tables)" />
  <calculationLink xlink:type="extended" xlink:role="http://opco.com/role/EarningsPerShareDetails" xlink:title="0604 - Disclosure - Earnings Per Share (Details)">
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding" xlink:label="us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_2" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements" xlink:label="us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_2" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_2" xlink:to="us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_2" order="20" use="optional" weight="1" priority="1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants" xlink:label="loc_IncrementalCommonSharesAttributableToCallOptionsAndWarrants" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_2" xlink:to="loc_IncrementalCommonSharesAttributableToCallOptionsAndWarrants" order="10" use="optional" weight="1" priority="1" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic" xlink:label="loc_WeightedAverageNumberOfSharesOutstandingBasic" />
    <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_2" xlink:to="loc_WeightedAverageNumberOfSharesOutstandingBasic" order="5" use="optional" weight="1" priority="1" />
  </calculationLink>
  <calculationLink xlink:type="extended" xlink:role="http://opco.com/role/EarningsPerShareDetailsTextual" xlink:title="06041 - Disclosure - Earnings Per Share (Details Textual)" />
  <calculationLink xlink:type="extended" xlink:role="http://opco.com/role/FinancialInstrumentsDetails8" xlink:title="06068 - Disclosure - Financial Instruments (Details 8)" />
  <calculationLink xlink:type="extended" xlink:role="http://opco.com/role/RegulatoryRequirementsDetails" xlink:title="0609 - Disclosure - Regulatory Requirements (Details)" />
</linkbase>
