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        <issuerCik>0001013237</issuerCik>
        <issuerName>FACTSET RESEARCH SYSTEMS INC</issuerName>
        <secFileNumber>001-11869</secFileNumber>
        <issuerAddress>
          <com:street1>45 GLOVER AVENUE</com:street1>
          <com:city>NORWALK</com:city>
          <com:stateOrCountry>CT</com:stateOrCountry>
          <com:zipCode>06850</com:zipCode>
        </issuerAddress>
        <issuerContactPhone>2038101000</issuerContactPhone>
        <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>Snow Frederick Philip</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
        <relationshipsToIssuer>
          <relationshipToIssuer>Officer</relationshipToIssuer>
        </relationshipsToIssuer>
      </issuerInfo>
      <securitiesInformation>
        <securitiesClassTitle>Common Stock</securitiesClassTitle>
        <brokerOrMarketmakerDetails>
          <name>Fidelity Brokerage Services LLC</name>
          <address>
            <com:street1>245 Summer Street</com:street1>
            <com:city>Boston</com:city>
            <com:stateOrCountry>MA</com:stateOrCountry>
            <com:zipCode>02110</com:zipCode>
          </address>
        </brokerOrMarketmakerDetails>
        <noOfUnitsSold>3000</noOfUnitsSold>
        <aggregateMarketValue>1335360.00</aggregateMarketValue>
        <noOfUnitsOutstanding>37947057</noOfUnitsOutstanding>
        <approxSaleDate>07/01/2025</approxSaleDate>
        <securitiesExchangeName>NYSE</securitiesExchangeName>
      </securitiesInformation>
      <securitiesToBeSold>
        <securitiesClassTitle>Common Stock</securitiesClassTitle>
        <acquiredDate>07/01/2025</acquiredDate>
        <natureOfAcquisitionTransaction>Stock Options Exercise</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>FACTSET RESEARCH SYSTEMS INC</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>3000</amountOfSecuritiesAcquired>
        <paymentDate>07/01/2025</paymentDate>
        <natureOfPayment>Wire</natureOfPayment>
      </securitiesToBeSold>
      <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
      <securitiesSoldInPast3Months>
        <sellerDetails>
          <name>Frederick Philip Snow</name>
          <address>
            <com:street1>c/o FACTSET RESEARCHSYSTEMS INC</com:street1>
            <com:street2>45 Glover Avenue</com:street2>
            <com:city>Norwalk</com:city>
            <com:stateOrCountry>CT</com:stateOrCountry>
            <com:zipCode>06850</com:zipCode>
          </address>
        </sellerDetails>
        <securitiesClassTitle>Common Stock</securitiesClassTitle>
        <saleDate>04/01/2025</saleDate>
        <amountOfSecuritiesSold>3000</amountOfSecuritiesSold>
        <grossProceeds>1364580.00</grossProceeds>
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        <sellerDetails>
          <name>Frederick Philip Snow</name>
          <address>
            <com:street1>c/o FACTSET RESEARCHSYSTEMS INC</com:street1>
            <com:street2>45 Glover Avenue</com:street2>
            <com:city>Norwalk</com:city>
            <com:stateOrCountry>CT</com:stateOrCountry>
            <com:zipCode>06850</com:zipCode>
          </address>
        </sellerDetails>
        <securitiesClassTitle>Common Stock</securitiesClassTitle>
        <saleDate>05/01/2025</saleDate>
        <amountOfSecuritiesSold>3000</amountOfSecuritiesSold>
        <grossProceeds>1293270.00</grossProceeds>
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          <name>Frederick Philip Snow</name>
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            <com:street1>/o FACTSET RESEARCHSYSTEMS INC</com:street1>
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            <com:stateOrCountry>CT</com:stateOrCountry>
            <com:zipCode>06850</com:zipCode>
          </address>
        </sellerDetails>
        <securitiesClassTitle>Common Stock	</securitiesClassTitle>
        <saleDate>06/02/2025</saleDate>
        <amountOfSecuritiesSold>3000</amountOfSecuritiesSold>
        <grossProceeds>1363740.00</grossProceeds>
      </securitiesSoldInPast3Months>
      <noticeSignature>
        <noticeDate>07/01/2025</noticeDate>
        <planAdoptionDates>
          <planAdoptionDate>09/26/2024</planAdoptionDate>
        </planAdoptionDates>
        <signature>Audrey Skillern as a duly authorized representative ofNational Financial Services LLC, as attorney-in-fact forFrederick Philip Snow</signature>
      </noticeSignature>
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text: 144
  0001611324
  XXXXXXXX
  LIVE
  0001013237
  FACTSET RESEARCH SYSTEMS INC
  001-11869
  45 GLOVER AVENUE
  NORWALK
  CT
  06850
  2038101000
  Snow Frederick Philip
  Officer
  Common Stock
  Fidelity Brokerage Services LLC
  245 Summer Street
  Boston
  MA
  02110
  3000
  1335360.00
  37947057
  07/01/2025
  NYSE
  Common Stock
  07/01/2025
  Stock Options Exercise
  FACTSET RESEARCH SYSTEMS INC
  N
  3000
  07/01/2025
  Wire
  N
  Frederick Philip Snow
  c/o FACTSET RESEARCHSYSTEMS INC
  45 Glover Avenue
  Norwalk
  CT
  06850
  Common Stock
  04/01/2025
  3000
  1364580.00
  Frederick Philip Snow
  c/o FACTSET RESEARCHSYSTEMS INC
  45 Glover Avenue
  Norwalk
  CT
  06850
  Common Stock
  05/01/2025
  3000
  1293270.00
  Frederick Philip Snow
  /o FACTSET RESEARCHSYSTEMS INC
  45 Glover Avenue
  Norwalk
  CT
  06850
  Common Stock
  06/02/2025
  3000
  1363740.00
  07/01/2025
  09/26/2024
  Audrey Skillern as a duly authorized representative ofNational Financial Services LLC, as attorney-in-fact forFrederick Philip Snow