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      <filer>
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          <cik>0001367441</cik>
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      <periodOfReport>12-31-2025</periodOfReport>
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      <filingManager>
        <name>STONEBRIDGE ADVISORS LLC</name>
        <address>
          <com:street1>10 WESTPORT ROAD</com:street1>
          <com:street2>SUITE C101</com:street2>
          <com:city>WILTON</com:city>
          <com:stateOrCountry>CT</com:stateOrCountry>
          <com:zipCode>06897</com:zipCode>
        </address>
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      <reportType>13F COMBINATION REPORT</reportType>
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          <form13FFileNumber>028-06487</form13FFileNumber>
          <crdNumber>000107027</crdNumber>
          <name>FIRST TRUST ADVISORS LP</name>
        </otherManager>
      </otherManagersInfo>
      <provideInfoForInstruction5>N</provideInfoForInstruction5>
    </coverPage>
    <signatureBlock>
      <name>Samantha Addonizio</name>
      <title>Chief Compliance Officer &amp; Counsel</title>
      <phone>203-708-1194</phone>
      <signature>Samantha Addonizio</signature>
      <city>Wilton</city>
      <stateOrCountry>CT</stateOrCountry>
      <signatureDate>02-05-2026</signatureDate>
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