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      <liveTestFlag>LIVE</liveTestFlag>
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        <issuerCredentials>
          <cik>0001497778</cik>
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      <investmentCompanyType>N-1A</investmentCompanyType>
      <periodOfReport>06/30/2026</periodOfReport>
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          <!--Field: Pseudo-Tag; ID: Series Name; Data: First Trust Short Duration High Income Fund-->
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      <yearOrQuarter>YEAR</yearOrQuarter>
      <reportCalendarYear>2026</reportCalendarYear>
      <reportingPerson>
        <name>FIRST TRUST SERIES FUND</name>
        <phoneNumber>630-765-8000</phoneNumber>
        <address>
          <com:street1>120 EAST LIBERTY DRIVE, SUITE 400</com:street1>
          <com:city>WHEATON</com:city>
          <com:stateOrCountry>IL</com:stateOrCountry>
          <com:zipCode>60187</com:zipCode>
        </address>
      </reportingPerson>
      <agentForService>
        <name>Scott Jardine</name>
        <address>
          <com:street1>c/o First Trust</com:street1>
          <com:street2>120 East Liberty Drive, Suite 400</com:street2>
          <com:city>Wheaton</com:city>
          <com:stateOrCountry>IL</com:stateOrCountry>
          <com:zipCode>60187</com:zipCode>
        </address>
      </agentForService>
      <reportInfo>
        <reportType>FUND VOTING REPORT</reportType>
      </reportInfo>
      <fileNumber>811-22452</fileNumber>
      <explanatoryInformation>
        <explanatoryChoice>N</explanatoryChoice>
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    <summaryPage>
      <otherIncludedManagersCount>2</otherIncludedManagersCount>
      <otherManagers2>
        <investmentManagers>
          <serialNo>1</serialNo>
          <form13FFileNumber>028-13334</form13FFileNumber>
          <name>Confluence Investment Management LLC</name>
        </investmentManagers>
        <investmentManagers>
          <serialNo>2</serialNo>
          <form13FFileNumber>028-07104</form13FFileNumber>
          <name>WCM Investment Management, LLC</name>
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          <nameOfSeries>First Trust Preferred Securities and Income Fund</nameOfSeries>
          <leiOfSeries>549300LKVIT5Y3616E74</leiOfSeries>
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          <nameOfSeries>First Trust Short Duration High Income Fund</nameOfSeries>
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        <seriesReports>
          <idOfSeries>S000030199</idOfSeries>
          <nameOfSeries>First Trust/Confluence Small Cap Value Fund</nameOfSeries>
          <leiOfSeries>549300GLRTARYID06M81</leiOfSeries>
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    </seriesPage>
    <signaturePage>
      <reportingPerson>FIRST TRUST SERIES FUND</reportingPerson>
      <txSignature>James M. Dykas</txSignature>
      <txPrintedSignature>James M. Dykas</txPrintedSignature>
      <txTitle>President and Chief Executive Officer</txTitle>
      <txAsOfDate>08/06/2026</txAsOfDate>
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