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      <filer>
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      <seriesClassInfo>
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        <classId>C000264350</classId>
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    </filerInfo>
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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 90 Series Structured Alt Protection ETF</seriesName>
      <seriesId>S000095622</seriesId>
      <seriesLei>529900VD9EWGHPIPPV83</seriesLei>
      <repPdEnd>2026-07-31</repPdEnd>
      <repPdDate>2026-07-31</repPdDate>
      <isFinalFiling>N</isFinalFiling>
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      <totLiabs>126.72</totLiabs>
      <netAssets>1489437.27</netAssets>
      <assetsAttrMiscSec>0.00000000</assetsAttrMiscSec>
      <assetsInvested>0.00000000</assetsInvested>
      <amtPayOneYrBanksBorr>0.00000000</amtPayOneYrBanksBorr>
      <amtPayOneYrCtrldComp>0.00000000</amtPayOneYrCtrldComp>
      <amtPayOneYrOthAffil>0.00000000</amtPayOneYrOthAffil>
      <amtPayOneYrOther>0.00000000</amtPayOneYrOther>
      <amtPayAftOneYrBanksBorr>0.00000000</amtPayAftOneYrBanksBorr>
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      <delayDeliv>0.00000000</delayDeliv>
      <standByCommit>0.00000000</standByCommit>
      <liquidPref>0.00000000</liquidPref>
      <cshNotRptdInCorD>1186.74000000</cshNotRptdInCorD>
      <isNonCashCollateral>N</isNonCashCollateral>
      <returnInfo>
        <monthlyTotReturns>
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    <invstOrSecs>
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        <name>Calamos Bitcoin 90 Series Structured Alt Protection ETF - October</name>
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        <title>Calamos Bitcoin 90 Series Structured Alt Protection ETF - October</title>
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        <units>NS</units>
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        <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>
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      <invstOrSec>
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        <lei>529900GY5CNX3HHUOU60</lei>
        <title>Calamos Bitcoin 90 Series Structured Alt Protection ETF - July</title>
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        <balance>16912.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>372554.45000000</valUSD>
        <pctVal>25.01310108884</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
        <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>
        <name>Calamos Bitcoin 90 Series Structured Alt Protection ETF - April</name>
        <lei>529900NT2Y524TJOZK20</lei>
        <title>Calamos Bitcoin 90 Series Structured Alt Protection ETF - April</title>
        <cusip>12811T662</cusip>
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        <balance>17508.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>373155.01000000</valUSD>
        <pctVal>25.05342235729</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>
      <invstOrSec>
        <name>Calamos Bitcoin 90% Protection Strategy ETF - January</name>
        <lei>529900T88YV37REL8T20</lei>
        <title>Calamos Bitcoin 90% Protection Strategy ETF - January</title>
        <cusip>12811T712</cusip>
        <identifiers>
          <isin value="US12811T7129"/>
        </identifiers>
        <balance>18524.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>369088.85000000</valUSD>
        <pctVal>24.78042260886</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>2026-08-18</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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