<SEC-DOCUMENT>0001752724-25-001487.txt : 20250110
<SEC-HEADER>0001752724-25-001487.hdr.sgml : 20250110
<ACCEPTANCE-DATETIME>20250110154452
ACCESSION NUMBER:		0001752724-25-001487
CONFORMED SUBMISSION TYPE:	N-CEN
PUBLIC DOCUMENT COUNT:		2
CONFORMED PERIOD OF REPORT:	20241031
FILED AS OF DATE:		20250110
DATE AS OF CHANGE:		20250110
EFFECTIVENESS DATE:		20250110

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			CALAMOS CONVERTIBLE OPPORTUNITIES & INCOME FUND
		CENTRAL INDEX KEY:			0001171471
		ORGANIZATION NAME:           	
		IRS NUMBER:				030426532
		FISCAL YEAR END:			1031

	FILING VALUES:
		FORM TYPE:		N-CEN
		SEC ACT:		1940 Act
		SEC FILE NUMBER:	811-21080
		FILM NUMBER:		25522701

	BUSINESS ADDRESS:	
		STREET 1:		2020 CALAMOS COURT
		STREET 2:		C/O CALAMOS ADVISORS LLC
		CITY:			NAPERVILLE
		STATE:			IL
		ZIP:			60563
		BUSINESS PHONE:		6302451046

	MAIL ADDRESS:	
		STREET 1:		2020 CALAMOS COURT
		STREET 2:		C/O CALAMOS ADVISORS LLC
		CITY:			NAPERVILLE
		STATE:			IL
		ZIP:			60563
</SEC-HEADER>
<DOCUMENT>
<TYPE>N-CEN
<SEQUENCE>1
<FILENAME>primary_doc.xml
<TEXT>
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        <website webpage="www.calamos.com"/>
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          <officeName>Computershare Inc.</officeName>
          <officeAddress1>150 Royall Street</officeAddress1>
          <officeCity>Canton</officeCity>
          <officeStateCountry officeCountry="US" officeState="US-MA"/>
          <officeRecordsZipCode>02021</officeRecordsZipCode>
          <officePhone>866-226-8016</officePhone>
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          <officeName>State Street Bank and Trust Company</officeName>
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          <officeCity>Boston</officeCity>
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          <directorName>Virginia G. Breen</directorName>
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          <directorName>John P. Calamos, Sr.</directorName>
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        <relyOnRuleTypes>
          <relyOnRuleType>Rule 18f-4(f)(17 CFR 270.18f-4(f))</relyOnRuleType>
          <relyOnRuleType>Rule 18f-4(c)(4) (17CFR 270.18f-4(c)(4))</relyOnRuleType>
          <relyOnRuleType>Rule 18f-4 (17 CFR 270.18f-4)</relyOnRuleType>
          <relyOnRuleType>Rule 12d1-1 (17 CFR 270.12d1-1)</relyOnRuleType>
          <relyOnRuleType>Rule 32a-4 (17 CFR 270.32a-4)</relyOnRuleType>
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        <isExpenseLimitationInPlace>N</isExpenseLimitationInPlace>
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        <isFeesWaivedRecoupable>N</isFeesWaivedRecoupable>
        <isExpenseWaivedRecoupable>N</isExpenseWaivedRecoupable>
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        <isTransferAgentHiredOrTerminated>N</isTransferAgentHiredOrTerminated>
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            <isPricingServiceAffiliated>N</isPricingServiceAffiliated>
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          <pricingService>
            <pricingServiceName>ICE Data Services, Inc.</pricingServiceName>
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            <pricingServiceIdNumberDesc>Tax ID</pricingServiceIdNumberDesc>
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            <pricingServiceName>London Stock Exchange Group PLC</pricingServiceName>
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            <pricingServiceName>Bloomberg L.P.</pricingServiceName>
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            <isPricingServiceAffiliated>N</isPricingServiceAffiliated>
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            <pricingServiceName>S&amp;P Global Inc.</pricingServiceName>
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            <custodianLei>2W8N8UU78PMDQKZENC08</custodianLei>
            <custodianCountry>IT</custodianCountry>
            <isCustodianAffiliated>N</isCustodianAffiliated>
            <isSubCustodian>Y</isSubCustodian>
            <custodyType>Foreign custodian - rule 17f-5 (17 CFR 270.17f-5)</custodyType>
          </custodian>
          <custodian>
            <custodianName>Deutsche Bank Aktiengesellschaft (Taipei City, TW, Branch)</custodianName>
            <custodianLei>25490016G0WR60ANOK04</custodianLei>
            <custodianCountry>TW</custodianCountry>
            <isCustodianAffiliated>N</isCustodianAffiliated>
            <isSubCustodian>Y</isSubCustodian>
            <custodyType>Foreign custodian - rule 17f-5 (17 CFR 270.17f-5)</custodyType>
          </custodian>
          <custodian>
            <custodianName>State Street Bank and Trust Company (Edinburgh, GB, Branch)</custodianName>
            <custodianLei>571474TGEMMWANRLN572</custodianLei>
            <custodianCountry>GB</custodianCountry>
            <isCustodianAffiliated>N</isCustodianAffiliated>
            <isSubCustodian>Y</isSubCustodian>
            <custodyType>Foreign custodian - rule 17f-5 (17 CFR 270.17f-5)</custodyType>
          </custodian>
          <custodian>
            <custodianName>State Street Bank and Trust Company</custodianName>
            <custodianLei>571474TGEMMWANRLN572</custodianLei>
            <custodianStateCountry custodianState="US-MA" custodianCountry="US"/>
            <isCustodianAffiliated>N</isCustodianAffiliated>
            <isSubCustodian>N</isSubCustodian>
            <custodyType>Bank - section 17(f)(1) (15 U.S.C. 80a-17(f)(1))</custodyType>
          </custodian>
          <custodian>
            <custodianName>Citibank del Peru S.A.</custodianName>
            <custodianLei>MYTK5NHHP1G8TVFGT193</custodianLei>
            <custodianCountry>PE</custodianCountry>
            <isCustodianAffiliated>N</isCustodianAffiliated>
            <isSubCustodian>Y</isSubCustodian>
            <custodyType>Foreign custodian - rule 17f-5 (17 CFR 270.17f-5)</custodyType>
          </custodian>
          <custodian>
            <custodianName>The Hongkong and Shanghai Banking Corporation Limited (Sydney, NSW, AU, Branch)</custodianName>
            <custodianLei>2HI3YI5320L3RW6NJ957</custodianLei>
            <custodianCountry>AU</custodianCountry>
            <isCustodianAffiliated>N</isCustodianAffiliated>
            <isSubCustodian>Y</isSubCustodian>
            <custodyType>Foreign custodian - rule 17f-5 (17 CFR 270.17f-5)</custodyType>
          </custodian>
          <custodian>
            <custodianName>UniCredit Bank Hungary Zrt.</custodianName>
            <custodianLei>Y28RT6GGYJ696PMW8T44</custodianLei>
            <custodianCountry>HU</custodianCountry>
            <isCustodianAffiliated>N</isCustodianAffiliated>
            <isSubCustodian>Y</isSubCustodian>
            <custodyType>Foreign custodian - rule 17f-5 (17 CFR 270.17f-5)</custodyType>
          </custodian>
          <custodian>
            <custodianName>BNP Paribas (Athens, Attica, GR, Branch)</custodianName>
            <custodianLei>R0MUWSFPU8MPRO8K5P83</custodianLei>
            <custodianCountry>GR</custodianCountry>
            <isCustodianAffiliated>N</isCustodianAffiliated>
            <isSubCustodian>Y</isSubCustodian>
            <custodyType>Foreign custodian - rule 17f-5 (17 CFR 270.17f-5)</custodyType>
          </custodian>
          <custodian>
            <custodianName>Standard Chartered Bank (Johannesburg, Gauteng, ZA, Branch)</custodianName>
            <custodianLei>RILFO74KP1CM8P6PCT96</custodianLei>
            <custodianCountry>ZA</custodianCountry>
            <isCustodianAffiliated>N</isCustodianAffiliated>
            <isSubCustodian>Y</isSubCustodian>
            <custodyType>Foreign custodian - rule 17f-5 (17 CFR 270.17f-5)</custodyType>
          </custodian>
          <custodian>
            <custodianName>BNP Paribas</custodianName>
            <custodianLei>R0MUWSFPU8MPRO8K5P83</custodianLei>
            <custodianCountry>FR</custodianCountry>
            <isCustodianAffiliated>N</isCustodianAffiliated>
            <isSubCustodian>Y</isSubCustodian>
            <custodyType>Foreign custodian - rule 17f-5 (17 CFR 270.17f-5)</custodyType>
          </custodian>
          <custodian>
            <custodianName>Standard Chartered Bank (Thai) Public Company Limited</custodianName>
            <custodianLei>549300O1LQYCQ7G1IM57</custodianLei>
            <custodianCountry>TH</custodianCountry>
            <isCustodianAffiliated>N</isCustodianAffiliated>
            <isSubCustodian>Y</isSubCustodian>
            <custodyType>Foreign custodian - rule 17f-5 (17 CFR 270.17f-5)</custodyType>
          </custodian>
          <custodian>
            <custodianName>UBS Switzerland AG</custodianName>
            <custodianLei>549300WOIFUSNYH0FL22</custodianLei>
            <custodianCountry>CH</custodianCountry>
            <isCustodianAffiliated>N</isCustodianAffiliated>
            <isSubCustodian>Y</isSubCustodian>
            <custodyType>Foreign custodian - rule 17f-5 (17 CFR 270.17f-5)</custodyType>
          </custodian>
          <custodian>
            <custodianName>Citibank Europe Public Limited Company</custodianName>
            <custodianLei>N1FBEDJ5J41VKZLO2475</custodianLei>
            <custodianCountry>IE</custodianCountry>
            <isCustodianAffiliated>N</isCustodianAffiliated>
            <isSubCustodian>Y</isSubCustodian>
            <custodyType>Foreign custodian - rule 17f-5 (17 CFR 270.17f-5)</custodyType>
          </custodian>
          <custodian>
            <custodianName>State Street Trust Company Canada</custodianName>
            <custodianLei>549300L71XG2CTQ2V827</custodianLei>
            <custodianCountry>CA</custodianCountry>
            <isCustodianAffiliated>N</isCustodianAffiliated>
            <isSubCustodian>Y</isSubCustodian>
            <custodyType>Foreign custodian - rule 17f-5 (17 CFR 270.17f-5)</custodyType>
          </custodian>
          <custodian>
            <custodianName>The Hongkong and Shanghai Banking Corporation Limited</custodianName>
            <custodianLei>2HI3YI5320L3RW6NJ957</custodianLei>
            <custodianCountry>HK</custodianCountry>
            <isCustodianAffiliated>N</isCustodianAffiliated>
            <isSubCustodian>Y</isSubCustodian>
            <custodyType>Foreign custodian - rule 17f-5 (17 CFR 270.17f-5)</custodyType>
          </custodian>
          <custodian>
            <custodianName>Skandinaviska Enskilda Banken AB (Copenhagen, Hovedstaden, DK, Branch)</custodianName>
            <custodianLei>F3JS33DEI6XQ4ZBPTN86</custodianLei>
            <custodianCountry>DK</custodianCountry>
            <isCustodianAffiliated>N</isCustodianAffiliated>
            <isSubCustodian>Y</isSubCustodian>
            <custodyType>Foreign custodian - rule 17f-5 (17 CFR 270.17f-5)</custodyType>
          </custodian>
          <custodian>
            <custodianName>Cititrust Colombia S A Sociedad Fiduciaria</custodianName>
            <custodianLei>549300242J3IJCOSGI49</custodianLei>
            <custodianCountry>CO</custodianCountry>
            <isCustodianAffiliated>N</isCustodianAffiliated>
            <isSubCustodian>Y</isSubCustodian>
            <custodyType>Foreign custodian - rule 17f-5 (17 CFR 270.17f-5)</custodyType>
          </custodian>
          <custodian>
            <custodianName>HSBC Bank (China) Company Limited</custodianName>
            <custodianLei>2CZOJRADNJXBLT55G526</custodianLei>
            <custodianCountry>CN</custodianCountry>
            <isCustodianAffiliated>N</isCustodianAffiliated>
            <isSubCustodian>Y</isSubCustodian>
            <custodyType>Foreign custodian - rule 17f-5 (17 CFR 270.17f-5)</custodyType>
          </custodian>
        </custodians>
        <isCustodianHiredOrTerminated>Y</isCustodianHiredOrTerminated>
        <shareholderServicingAgents>
          <shareholderServicingAgent>
            <shareholderServiceAgentName>Computershare Inc.</shareholderServiceAgentName>
            <shareholderServiceAgentLei>254900Y7PP3ZED9AUY94</shareholderServiceAgentLei>
            <shareholderServiceAgentStateCountry shareholderServiceAgentState="US-MA" shareholderServiceAgentCountry="US"/>
            <isShareholderServiceAgentAffiliated>N</isShareholderServiceAgentAffiliated>
            <isShareholderServiceAgentSubshare>N</isShareholderServiceAgentSubshare>
          </shareholderServicingAgent>
        </shareholderServicingAgents>
        <isShareholderServiceHiredTerminated>N</isShareholderServiceHiredTerminated>
        <admins>
          <admin>
            <adminName>State Street Bank and Trust Company</adminName>
            <adminLei>571474TGEMMWANRLN572</adminLei>
            <adminStateCountry adminState="US-MA" adminCountry="US"/>
            <isAdminAffiliated>N</isAdminAffiliated>
            <isAdminSubAdmin>N</isAdminSubAdmin>
          </admin>
        </admins>
        <isAdminHiredOrTerminated>N</isAdminHiredOrTerminated>
        <brokerDealers>
          <brokerDealer>
            <brokerDealerName>Calamos Financial Services LLC</brokerDealerName>
            <brokerDealerFileNo>8-37854</brokerDealerFileNo>
            <brokerDealerCrdNo>000019850</brokerDealerCrdNo>
            <brokerDealerLei>N/A</brokerDealerLei>
            <brokerDealerStateCountry brokerDealerState="US-IL" brokerDealerCountry="US"/>
            <brokerDealerCommission>0.00000000</brokerDealerCommission>
          </brokerDealer>
        </brokerDealers>
        <brokers>
          <broker>
            <brokerName>BNP Paribas Securities Corp.</brokerName>
            <brokerFileNo>8-32682</brokerFileNo>
            <brokerCrdNo>000015794</brokerCrdNo>
            <brokerLei>RCNB6OTYUAMMP879YW96</brokerLei>
            <brokerStateCountry brokerState="US-NY" brokerCountry="US"/>
            <grossCommission>3200.00000000</grossCommission>
          </broker>
          <broker>
            <brokerName>Cowen and Company, LLC</brokerName>
            <brokerFileNo>8-22522</brokerFileNo>
            <brokerCrdNo>000007616</brokerCrdNo>
            <brokerLei>549300WR155U7DVMIW58</brokerLei>
            <brokerStateCountry brokerState="US-NY" brokerCountry="US"/>
            <grossCommission>428.91000000</grossCommission>
          </broker>
          <broker>
            <brokerName>Jefferies LLC</brokerName>
            <brokerFileNo>8-15074</brokerFileNo>
            <brokerCrdNo>000002347</brokerCrdNo>
            <brokerLei>58PU97L1C0WSRCWADL48</brokerLei>
            <brokerStateCountry brokerState="US-NY" brokerCountry="US"/>
            <grossCommission>354.00000000</grossCommission>
          </broker>
          <broker>
            <brokerName>Virtu Americas LLC</brokerName>
            <brokerFileNo>8-68193</brokerFileNo>
            <brokerCrdNo>000149823</brokerCrdNo>
            <brokerLei>549300RA02N3BNSWBV74</brokerLei>
            <brokerStateCountry brokerState="US-NY" brokerCountry="US"/>
            <grossCommission>171.16000000</grossCommission>
          </broker>
          <broker>
            <brokerName>Goldman Sachs &amp; Co. LLC</brokerName>
            <brokerFileNo>8-129</brokerFileNo>
            <brokerCrdNo>000000361</brokerCrdNo>
            <brokerLei>FOR8UP27PHTHYVLBNG30</brokerLei>
            <brokerStateCountry brokerState="US-NY" brokerCountry="US"/>
            <grossCommission>3200.00000000</grossCommission>
          </broker>
          <broker>
            <brokerName>BofA Securities, Inc.</brokerName>
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            <brokerCrdNo>000283942</brokerCrdNo>
            <brokerLei>549300HN4UKV1E2R3U73</brokerLei>
            <brokerStateCountry brokerState="US-NY" brokerCountry="US"/>
            <grossCommission>1912.00000000</grossCommission>
          </broker>
          <broker>
            <brokerName>UBS Securities LLC</brokerName>
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            <brokerCrdNo>000007654</brokerCrdNo>
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            <grossCommission>500.00000000</grossCommission>
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          <broker>
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            <brokerCrdNo>000019714</brokerCrdNo>
            <brokerLei>AC28XWWI3WIBK2824319</brokerLei>
            <brokerStateCountry brokerState="US-NY" brokerCountry="US"/>
            <grossCommission>6500.00000000</grossCommission>
          </broker>
          <broker>
            <brokerName>Morgan Stanley &amp; Co. LLC</brokerName>
            <brokerFileNo>8-15869</brokerFileNo>
            <brokerCrdNo>000008209</brokerCrdNo>
            <brokerLei>9R7GPTSO7KV3UQJZQ078</brokerLei>
            <brokerStateCountry brokerState="US-NY" brokerCountry="US"/>
            <grossCommission>1667.00000000</grossCommission>
          </broker>
          <broker>
            <brokerName>J.P. Morgan Securities LLC</brokerName>
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            <brokerCrdNo>000000079</brokerCrdNo>
            <brokerLei>ZBUT11V806EZRVTWT807</brokerLei>
            <brokerStateCountry brokerState="US-NY" brokerCountry="US"/>
            <grossCommission>181.20000000</grossCommission>
          </broker>
        </brokers>
        <aggregateCommission>18121.70000000</aggregateCommission>
        <principalTransactions>
          <principalTransaction>
            <principalName>Citigroup Global Markets Inc.</principalName>
            <principalFileNo>8-8177</principalFileNo>
            <principalCrdNo>000007059</principalCrdNo>
            <principalLei>MBNUM2BPBDO7JBLYG310</principalLei>
            <principalStateCountry principalState="US-NY" principalCountry="US"/>
            <principalTotalPurchaseSale>62063882.39000000</principalTotalPurchaseSale>
          </principalTransaction>
          <principalTransaction>
            <principalName>J.P. Morgan Securities LLC</principalName>
            <principalFileNo>8-35008</principalFileNo>
            <principalCrdNo>000000079</principalCrdNo>
            <principalLei>ZBUT11V806EZRVTWT807</principalLei>
            <principalStateCountry principalState="US-NY" principalCountry="US"/>
            <principalTotalPurchaseSale>356714411.51000000</principalTotalPurchaseSale>
          </principalTransaction>
          <principalTransaction>
            <principalName>Jefferies LLC</principalName>
            <principalFileNo>8-15074</principalFileNo>
            <principalCrdNo>000002347</principalCrdNo>
            <principalLei>58PU97L1C0WSRCWADL48</principalLei>
            <principalStateCountry principalState="US-NY" principalCountry="US"/>
            <principalTotalPurchaseSale>81373276.48000000</principalTotalPurchaseSale>
          </principalTransaction>
          <principalTransaction>
            <principalName>Morgan Stanley &amp; Co. LLC</principalName>
            <principalFileNo>8-15869</principalFileNo>
            <principalCrdNo>000008209</principalCrdNo>
            <principalLei>9R7GPTSO7KV3UQJZQ078</principalLei>
            <principalStateCountry principalState="US-NY" principalCountry="US"/>
            <principalTotalPurchaseSale>61351580.72000000</principalTotalPurchaseSale>
          </principalTransaction>
          <principalTransaction>
            <principalName>BofA Securities, Inc.</principalName>
            <principalFileNo>8-69787</principalFileNo>
            <principalCrdNo>000283942</principalCrdNo>
            <principalLei>549300HN4UKV1E2R3U73</principalLei>
            <principalStateCountry principalState="US-NY" principalCountry="US"/>
            <principalTotalPurchaseSale>136219886.61000000</principalTotalPurchaseSale>
          </principalTransaction>
          <principalTransaction>
            <principalName>Wells Fargo Securities, LLC</principalName>
            <principalFileNo>8-65876</principalFileNo>
            <principalCrdNo>000126292</principalCrdNo>
            <principalLei>VYVVCKR63DVZZN70PB21</principalLei>
            <principalStateCountry principalState="US-NC" principalCountry="US"/>
            <principalTotalPurchaseSale>45152452.86000000</principalTotalPurchaseSale>
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          <principalTransaction>
            <principalName>Goldman Sachs &amp; Co. LLC</principalName>
            <principalFileNo>8-129</principalFileNo>
            <principalCrdNo>000000361</principalCrdNo>
            <principalLei>FOR8UP27PHTHYVLBNG30</principalLei>
            <principalStateCountry principalState="US-NY" principalCountry="US"/>
            <principalTotalPurchaseSale>84135306.61000000</principalTotalPurchaseSale>
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          <principalTransaction>
            <principalName>UBS Securities LLC</principalName>
            <principalFileNo>8-22651</principalFileNo>
            <principalCrdNo>000007654</principalCrdNo>
            <principalLei>T6FIZBDPKLYJKFCRVK44</principalLei>
            <principalStateCountry principalState="US-NY" principalCountry="US"/>
            <principalTotalPurchaseSale>38028270.16000000</principalTotalPurchaseSale>
          </principalTransaction>
          <principalTransaction>
            <principalName>Barclays Capital Inc.</principalName>
            <principalFileNo>8-41342</principalFileNo>
            <principalCrdNo>000019714</principalCrdNo>
            <principalLei>AC28XWWI3WIBK2824319</principalLei>
            <principalStateCountry principalState="US-NY" principalCountry="US"/>
            <principalTotalPurchaseSale>87041100.07000000</principalTotalPurchaseSale>
          </principalTransaction>
          <principalTransaction>
            <principalName>Nomura Securities International, Inc.</principalName>
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            <principalCrdNo>000004297</principalCrdNo>
            <principalLei>OXTKY6Q8X53C9ILVV871</principalLei>
            <principalStateCountry principalState="US-NY" principalCountry="US"/>
            <principalTotalPurchaseSale>33457979.72000000</principalTotalPurchaseSale>
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        </principalTransactions>
        <principalAggregatePurchase>1206459382.74000000</principalAggregatePurchase>
        <isBrokerageResearchPayment>Y</isBrokerageResearchPayment>
        <mnthlyAvgNetAssets>743715048.31000000</mnthlyAvgNetAssets>
      </managementInvestmentQuestion>
    </managementInvestmentQuestionSeriesInfo>
    <closedEndManagementInvestment>
      <securityRelatedItems>
        <securityRelatedItem>
          <description>Preferred stock</description>
          <securityClassTitle>Series G</securityClassTitle>
          <commonStocks>
            <commonStock commonStockExchange="N/A" commonStockTickerSymbol="N/A"/>
          </commonStocks>
        </securityRelatedItem>
        <securityRelatedItem>
          <description>Preferred stock</description>
          <securityClassTitle>Series E</securityClassTitle>
          <commonStocks>
            <commonStock commonStockExchange="N/A" commonStockTickerSymbol="N/A"/>
          </commonStocks>
        </securityRelatedItem>
        <securityRelatedItem>
          <description>Preferred stock</description>
          <securityClassTitle>Series C</securityClassTitle>
          <commonStocks>
            <commonStock commonStockExchange="N/A" commonStockTickerSymbol="N/A"/>
          </commonStocks>
        </securityRelatedItem>
        <securityRelatedItem>
          <description>Common stock</description>
          <securityClassTitle>Common shares</securityClassTitle>
          <commonStocks>
            <commonStock commonStockExchange="XNGS" commonStockTickerSymbol="CHI"/>
          </commonStocks>
        </securityRelatedItem>
        <securityRelatedItem>
          <description>Preferred stock</description>
          <securityClassTitle>Series D</securityClassTitle>
          <commonStocks>
            <commonStock commonStockExchange="N/A" commonStockTickerSymbol="N/A"/>
          </commonStocks>
        </securityRelatedItem>
      </securityRelatedItems>
      <isRightsOffering>N</isRightsOffering>
      <isSecondaryOffering>N</isSecondaryOffering>
      <isRepurchaseSecurity>N</isRepurchaseSecurity>
      <isDefaultLongTermDebt>N</isDefaultLongTermDebt>
      <isDividendsInArrears>N</isDividendsInArrears>
      <isSecuritiesModified>N</isSecuritiesModified>
      <managementFee>1.28000000</managementFee>
      <netOperatingExpenses>4.52000000</netOperatingExpenses>
      <marketPricePerShare>11.43000000</marketPricePerShare>
      <netAssetValuePerShare>10.04000000</netAssetValuePerShare>
    </closedEndManagementInvestment>
    <attachmentsTab>
      <isIPAReportInternalControl>true</isIPAReportInternalControl>
    </attachmentsTab>
    <signature registrantSignedName="CALAMOS CONVERTIBLE OPPORTUNITIES &amp; INCOME FUND" signedDate="2025-01-10" signature="Stephen Atkins" title="Treasurer"/>
  </formData>
</edgarSubmission>
</XML>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>INTERNAL CONTROL RPT
<SEQUENCE>2
<FILENAME>NCEN_811-21080_40602131_1024.htm
<TEXT>

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<a name="page_1"></a><a name="_bclPageBorder1"></a><DIV STYLE="PADDING-RIGHT: 0%; PADDING-LEFT: 0%">
<p style="margin-bottom:8.0pt;margin-left:0in;margin-right:0in;margin-top:0in;"><b><font face=Calibri,sans-serif lang=EN style="font-size:8.0pt;line-height:107%;">REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM</font></b><font face=Calibri,sans-serif lang=EN style="font-size:8.0pt;line-height:107%;"> <br>
<br>
To the shareholders and the Board of Trustees of Calamos Convertible
Opportunities and Income Fund, Calamos Convertible and High Income Fund,
Calamos Strategic Total Return Fund, Calamos Dynamic Convertible and Income
Fund, Calamos Global Dynamic Income Fund, Calamos Global Total Return Fund, and
Calamos Long/Short Equity &amp; Dynamic Income Trust<br>
<br>
In planning and performing our audits of the financial statements of Calamos
Convertible Opportunities and Income Fund, Calamos Convertible and High Income
Fund, Calamos Strategic Total Return Fund, Calamos Dynamic Convertible and
Income Fund, Calamos Global Dynamic Income Fund, Calamos Global Total Return
Fund, and Calamos Long/Short Equity &amp; Dynamic Income Trust (</font><font face=Calibri,sans-serif lang=EN-US style="font-size:8.0pt;line-height:107%;"> each a &#8220;Fund&#8221;; collectively, the
&#8220;Funds&#8221;</font><font face=Calibri,sans-serif lang=EN style="font-size:8.0pt;line-height:107%;">) as of
and for the year ended October 31, 2024, in accordance with the standards of
the Public Company Accounting Oversight Board (United States) (PCAOB), we
considered the Funds&#8217; internal control over financial reporting, including
controls over safeguarding securities, as a basis for designing our auditing
procedures for the purpose of expressing our opinion on the financial
statements and to comply with the requirements of Form N-CEN, but not for the
purpose of expressing an opinion on the effectiveness of the Funds&#8217; internal
control over financial reporting. Accordingly, we express no such opinion.<br>
<br>
The management of the Funds are responsible for establishing and maintaining
effective internal control over financial reporting. In fulfilling this
responsibility, estimates and judgments by management are required to assess
the expected benefits and related costs of controls. A fund's internal control
over financial reporting is a process designed to provide reasonable assurance
regarding the reliability of financial reporting and the preparation of
financial statements for external purposes in accordance with generally
accepted accounting principles. A fund's internal control over financial
reporting includes those policies and procedures that (1) pertain to the
maintenance of records that, in reasonable detail, accurately and fairly
reflect the transactions and dispositions of the assets of the fund; (2)
provide reasonable assurance that transactions are recorded as necessary to
permit preparation of financial statements in accordance with generally
accepted accounting principles, and that receipts and expenditures of the fund
are being made only in accordance with authorizations of management and trustees
of the fund; and (3) provide reasonable assurance regarding prevention or
timely detection of unauthorized acquisition, use, or disposition of a fund's
assets that could have a material effect on the financial statements.<br>
<br>
Because of its inherent limitations, internal control over financial reporting
may not prevent or detect misstatements. Also, projections of any evaluation of
effectiveness to future periods are subject to the risk that controls may
become inadequate because of changes in conditions or that the degree of
compliance with the policies or procedures may deteriorate.<br>
<br>
A deficiency in internal control over financial reporting exists when the
design or operation of a control does not allow management or employees, in the
normal course of performing their assigned functions, to prevent or detect
misstatements on a timely basis. A material weakness is a deficiency, or a
combination of deficiencies, in internal control over financial reporting, such
that there is a reasonable possibility that a material misstatement of the
fund's annual or interim financial statements will not be prevented or detected
on a timely basis.<br>
<br>
Our consideration of the Funds&#8217; internal control over financial reporting was
for the limited purpose described in the first paragraph and would not
necessarily disclose all deficiencies in internal control that might be
material weaknesses under standards established by the PCAOB. However, we noted
no deficiencies in the Funds&#8217; internal control over financial reporting and its
operation, including controls for safeguarding securities, that we consider to
be a material weakness, as defined above, as of October 31, 2024.<br>
<br>
This report is intended solely for the information and use of management and
the Board of Trustees of the Funds and the Securities and Exchange Commission
and is not intended to be and should not be used by anyone other than these
specified parties.<br>
<br>
/s/ Deloitte &amp; Touche LLP</font></p>

<p style="margin-bottom:8.0pt;margin-left:0in;margin-right:0in;margin-top:0in;"><font face=Calibri,sans-serif lang=EN style="font-size:8.0pt;line-height:107%;">Chicago,
Illinois<br>
<br>
December 18, 2024</font></p>

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