<SEC-DOCUMENT>0001959173-25-001662.txt : 20250304
<SEC-HEADER>0001959173-25-001662.hdr.sgml : 20250304
<ACCEPTANCE-DATETIME>20250304155446
ACCESSION NUMBER:		0001959173-25-001662
CONFORMED SUBMISSION TYPE:	144
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20250304
DATE AS OF CHANGE:		20250304

SUBJECT COMPANY:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			INTEGRAL AD SCIENCE HOLDING CORP.
		CENTRAL INDEX KEY:			0001842718
		STANDARD INDUSTRIAL CLASSIFICATION:	SERVICES-COMPUTER PROGRAMMING, DATA PROCESSING, ETC. [7370]
		ORGANIZATION NAME:           	06 Technology
		IRS NUMBER:				830731995
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		144
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	001-40557
		FILM NUMBER:		25703975

	BUSINESS ADDRESS:	
		STREET 1:		99 WALL STREET
		STREET 2:		#1950
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10005
		BUSINESS PHONE:		(646) 278-4871

	MAIL ADDRESS:	
		STREET 1:		99 WALL STREET
		STREET 2:		#1950
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10005

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	INTEGRAL AD SCIENCE HOLDING LLC
		DATE OF NAME CHANGE:	20210301

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	KAVACHA TOPCO, LLC
		DATE OF NAME CHANGE:	20210127

REPORTING-OWNER:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Gil Alexis II
		CENTRAL INDEX KEY:			0002001306
		ORGANIZATION NAME:           	

	FILING VALUES:
		FORM TYPE:		144

	MAIL ADDRESS:	
		STREET 1:		95 MORTON STREET
		STREET 2:		8TH FLOOR
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10014
</SEC-HEADER>
<DOCUMENT>
<TYPE>144
<SEQUENCE>1
<FILENAME>primary_doc.xml
<TEXT>
<XML>
<?xml version="1.0" encoding="UTF-8"?><edgarSubmission xmlns="http://www.sec.gov/edgar/ownership" xmlns:com="http://www.sec.gov/edgar/common">
  <headerData>
    <submissionType>144</submissionType>
    <filerInfo>
      <filer>
        <filerCredentials>
          <cik>0002001306</cik>
          <ccc>XXXXXXXX</ccc>
        </filerCredentials>
      </filer>
      <liveTestFlag>LIVE</liveTestFlag>



    </filerInfo>
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  <formData>
    <issuerInfo>
      <issuerCik>0001842718</issuerCik>
      <issuerName>INTEGRAL AD SCIENCE HOLDING CORP.</issuerName>
      <secFileNumber>001-40557</secFileNumber>
      <issuerAddress>
        <com:street1>99 WALL STREET</com:street1>
        <com:street2>#1950</com:street2>
        <com:city>NEW YORK</com:city>
        <com:stateOrCountry>NY</com:stateOrCountry>
        <com:zipCode>10005</com:zipCode>
      </issuerAddress>
      <issuerContactPhone>(646) 278-4871</issuerContactPhone>
      <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>Gil Alexis II</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
      <relationshipsToIssuer>
        <relationshipToIssuer>Officer</relationshipToIssuer>
      </relationshipsToIssuer>
    </issuerInfo>
    <securitiesInformation>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <brokerOrMarketmakerDetails>
        <name>Fidelity Brokerage Services LLC</name>
        <address>
          <com:street1>900 Salem Street</com:street1>
          <com:city>Smithfield</com:city>
          <com:stateOrCountry>RI</com:stateOrCountry>
          <com:zipCode>02917</com:zipCode>
        </address>
      </brokerOrMarketmakerDetails>
      <noOfUnitsSold>3284</noOfUnitsSold>
      <aggregateMarketValue>34192.68</aggregateMarketValue>
      <noOfUnitsOutstanding>163800302</noOfUnitsOutstanding>
      <approxSaleDate>03/04/2025</approxSaleDate>
      <securitiesExchangeName>NASDAQ</securitiesExchangeName>
    </securitiesInformation>
    <securitiesToBeSold>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <acquiredDate>03/03/2025</acquiredDate>
      <natureOfAcquisitionTransaction>Restricted Stock Vesting</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>3284</amountOfSecuritiesAcquired>
      <paymentDate>03/03/2025</paymentDate>
      <natureOfPayment>Compensation</natureOfPayment>
    </securitiesToBeSold>
    <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Alexis Gil II</name>
        <address>
          <com:street1>12 E 49th Street</com:street1>
          <com:street2>20th Floor</com:street2>
          <com:city>New York</com:city>
          <com:stateOrCountry>NY</com:stateOrCountry>
          <com:zipCode>10017</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <saleDate>01/03/2025</saleDate>
      <amountOfSecuritiesSold>721</amountOfSecuritiesSold>
      <grossProceeds>7708.43</grossProceeds>
    </securitiesSoldInPast3Months>
    <remarks>Sale includes an amount necessary to cover a tax obligation resulting from the settlement of a vested equity award distribution.</remarks>
    <noticeSignature>
      <noticeDate>03/04/2025</noticeDate>
      <signature>/s/ Corey Walter, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Alexis Gil II</signature>
    </noticeSignature>
  </formData>
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</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
