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      <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 S&amp;P 500 Structured Alt Protection ETF</seriesName>
      <seriesId>S000088047</seriesId>
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      <repPdEnd>2026-07-31</repPdEnd>
      <repPdDate>2026-07-31</repPdDate>
      <isFinalFiling>N</isFinalFiling>
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      <totLiabs>19359.18</totLiabs>
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      <assetsInvested>0.00000000</assetsInvested>
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        <fairValLevel>1</fairValLevel>
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        <fairValLevel>1</fairValLevel>
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        <fairValLevel>1</fairValLevel>
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      <invstOrSec>
        <name>Calamos S&amp;P 500 Structured Alt Protection ETF - April</name>
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        <fairValLevel>1</fairValLevel>
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          <isLoanByFund>N</isLoanByFund>
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      <invstOrSec>
        <name>Calamos S&amp;P 500 Structured Alt Protection ETF - March</name>
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        <fairValLevel>1</fairValLevel>
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      <invstOrSec>
        <name>Calamos S&amp;P 500 Structured Alt Protection ETF - February</name>
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        <fairValLevel>1</fairValLevel>
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          <isLoanByFund>N</isLoanByFund>
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        <fairValLevel>1</fairValLevel>
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      <invstOrSec>
        <name>Calamos S&amp;P 500 Structured Alt Protection ETF - December</name>
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        <fairValLevel>1</fairValLevel>
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      <invstOrSec>
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        <fairValLevel>1</fairValLevel>
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      <invstOrSec>
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        <fairValLevel>1</fairValLevel>
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      <invstOrSec>
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        <fairValLevel>1</fairValLevel>
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          <isLoanByFund>N</isLoanByFund>
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      </invstOrSec>
      <invstOrSec>
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        <balance>374416.00000000</balance>
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        <invCountry>US</invCountry>
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        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
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      </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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</edgarSubmission>
