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      <filer>
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      <regFileNumber>811-22887</regFileNumber>
      <regCik>0001579881</regCik>
      <regLei>549300B2KP9WEFDULJ54</regLei>
      <regStreet1>2020 CALAMOS COURT</regStreet1>
      <regCity>NAPERVILLE</regCity>
      <regStateConditional regCountry="US" regState="US-IL"/>
      <regZipOrPostalCode>60563</regZipOrPostalCode>
      <regPhone>630-245-7200</regPhone>
      <seriesName>Calamos Laddered Bitcoin Structured Alt Protection ETF</seriesName>
      <seriesId>S000095621</seriesId>
      <seriesLei>529900F77E1ZLRZILU15</seriesLei>
      <repPdEnd>2026-07-31</repPdEnd>
      <repPdDate>2026-04-30</repPdDate>
      <isFinalFiling>N</isFinalFiling>
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      <totLiabs>193.00</totLiabs>
      <netAssets>2354259.56</netAssets>
      <assetsAttrMiscSec>0.00000000</assetsAttrMiscSec>
      <assetsInvested>0.00000000</assetsInvested>
      <amtPayOneYrBanksBorr>0.00000000</amtPayOneYrBanksBorr>
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      <liquidPref>0.00000000</liquidPref>
      <cshNotRptdInCorD>4175.13000000</cshNotRptdInCorD>
      <isNonCashCollateral>N</isNonCashCollateral>
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        <name>Calamos Bitcoin Structured Alt Protection ETF - July</name>
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        <title>Calamos Bitcoin Structured Alt Protection ETF - July</title>
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        <units>NS</units>
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        <payoffProfile>Long</payoffProfile>
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        <issuerCat>RF</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>
        
        <fairValLevel>1</fairValLevel>
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          <isCashCollateral>N</isCashCollateral>
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          <isLoanByFund>N</isLoanByFund>
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        <name>Calamos Bitcoin Structured Alt Protection ETF - January</name>
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        <title>Calamos Bitcoin Structured Alt Protection ETF - January</title>
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        <units>NS</units>
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        <valUSD>571429.50000000</valUSD>
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        <payoffProfile>Long</payoffProfile>
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        <issuerCat>RF</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>
        
        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
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          <isLoanByFund>N</isLoanByFund>
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      <invstOrSec>
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        <title>Calamos Bitcoin Structured Alt Protection ETF - October</title>
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        <balance>24997.00000000</balance>
        <units>NS</units>
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        <pctVal>25.91799053796</pctVal>
        <payoffProfile>Long</payoffProfile>
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        <issuerCat>RF</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>
        
        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Calamos Bitcoin Structured Alt Protection ETF - April</name>
        <lei>5299004T0HM3EILLAF89</lei>
        <title>Calamos Bitcoin Structured Alt Protection ETF - April</title>
        <cusip>12811T670</cusip>
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        <balance>23349.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>572211.61000000</valUSD>
        <pctVal>24.30537480752</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
        <issuerCat>RF</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>
        
        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
    </invstOrSecs>
    <explntrNotes>
      <explntrNote note="Monthly returns presented in Item B.5(a) have been calculated without deducting any applicable sales loads or redemption fees." noteItem="B.5.a"/>
    </explntrNotes>
    <signature>
      <ncom:dateSigned>2026-06-11</ncom:dateSigned>
      <ncom:nameOfApplicant>Calamos ETF Trust</ncom:nameOfApplicant>
      <ncom:signature>Stephen Atkins</ncom:signature>
      <ncom:signerName>Stephen Atkins</ncom:signerName>
      <ncom:title>Treasurer</ncom:title>
    </signature>
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