<SEC-DOCUMENT>0001959173-24-008180.txt : 20241125
<SEC-HEADER>0001959173-24-008180.hdr.sgml : 20241125
<ACCEPTANCE-DATETIME>20241125170340
ACCESSION NUMBER:		0001959173-24-008180
CONFORMED SUBMISSION TYPE:	144
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20241125
DATE AS OF CHANGE:		20241125

SUBJECT COMPANY:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Klaviyo, Inc.
		CENTRAL INDEX KEY:			0001835830
		STANDARD INDUSTRIAL CLASSIFICATION:	SERVICES-PREPACKAGED SOFTWARE [7372]
		ORGANIZATION NAME:           	06 Technology
		IRS NUMBER:				000000000
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		144
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	001-41806
		FILM NUMBER:		241496869

	BUSINESS ADDRESS:	
		STREET 1:		125 SUMMER STREET, FLOOR 6
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02110
		BUSINESS PHONE:		800-338-1744

	MAIL ADDRESS:	
		STREET 1:		125 SUMMER STREET, FLOOR 6
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02110

REPORTING-OWNER:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Chaves Allen
		CENTRAL INDEX KEY:			0001991400
		ORGANIZATION NAME:           	

	FILING VALUES:
		FORM TYPE:		144

	MAIL ADDRESS:	
		STREET 1:		KLAVIYO, INC.
		STREET 2:		125 SUMMER STREET, 6TH FLOOR
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02110
</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>0001991400</cik>
          <ccc>XXXXXXXX</ccc>
        </filerCredentials>
      </filer>
      <liveTestFlag>LIVE</liveTestFlag>



    </filerInfo>
  </headerData>
  <formData>
    <issuerInfo>
      <issuerCik>0001835830</issuerCik>
      <issuerName>Klaviyo, Inc.</issuerName>
      <secFileNumber>001-41806</secFileNumber>
      <issuerAddress>
        <com:street1>125 SUMMER STREET, FLOOR 6</com:street1>
        <com:city>BOSTON</com:city>
        <com:stateOrCountry>MA</com:stateOrCountry>
        <com:zipCode>02110</com:zipCode>
      </issuerAddress>
      <issuerContactPhone>800-338-1744</issuerContactPhone>
      <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>Chaves Allen</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
      <relationshipsToIssuer>
        <relationshipToIssuer>Officer</relationshipToIssuer>
        <relationshipToIssuer>Director</relationshipToIssuer>
      </relationshipsToIssuer>
    </issuerInfo>
    <securitiesInformation>
      <securitiesClassTitle>Series A</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>147750</noOfUnitsSold>
      <aggregateMarketValue>5474831.06</aggregateMarketValue>
      <noOfUnitsOutstanding>78803963</noOfUnitsOutstanding>
      <approxSaleDate>11/25/2024</approxSaleDate>
      <securitiesExchangeName>NYSE</securitiesExchangeName>
    </securitiesInformation>
    <securitiesToBeSold>
      <securitiesClassTitle>Series A</securitiesClassTitle>
      <acquiredDate>11/25/2024</acquiredDate>
      <natureOfAcquisitionTransaction>Option Granted - 04/16/2020</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>147750</amountOfSecuritiesAcquired>
      <paymentDate>11/25/2024</paymentDate>
      <natureOfPayment>Compensation</natureOfPayment>
    </securitiesToBeSold>
    <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Allen M. Chaves Jr</name>
        <address>
          <com:street1>125 Summer Street</com:street1>
          <com:street2>6th Floor</com:street2>
          <com:city>Boston</com:city>
          <com:stateOrCountry>MA</com:stateOrCountry>
          <com:zipCode>02110</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Series A</securitiesClassTitle>
      <saleDate>09/16/2024</saleDate>
      <amountOfSecuritiesSold>130000</amountOfSecuritiesSold>
      <grossProceeds>4140448.00</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Allen M. Chaves Jr</name>
        <address>
          <com:street1>125 Summer Street</com:street1>
          <com:street2>6th Floor</com:street2>
          <com:city>Boston</com:city>
          <com:stateOrCountry>MA</com:stateOrCountry>
          <com:zipCode>02110</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Series A</securitiesClassTitle>
      <saleDate>11/11/2024</saleDate>
      <amountOfSecuritiesSold>150000</amountOfSecuritiesSold>
      <grossProceeds>5037900.00</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Allen M. Chaves Jr</name>
        <address>
          <com:street1>125 Summer Street</com:street1>
          <com:street2>6th Floor</com:street2>
          <com:city>Boston</com:city>
          <com:stateOrCountry>MA</com:stateOrCountry>
          <com:zipCode>02110</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Series A</securitiesClassTitle>
      <saleDate>11/12/2024</saleDate>
      <amountOfSecuritiesSold>150000</amountOfSecuritiesSold>
      <grossProceeds>5464860.00</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Allen M. Chaves Jr</name>
        <address>
          <com:street1>125 Summer Street</com:street1>
          <com:street2>6th Floor</com:street2>
          <com:city>Boston</com:city>
          <com:stateOrCountry>MA</com:stateOrCountry>
          <com:zipCode>02110</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Series A</securitiesClassTitle>
      <saleDate>11/13/2024</saleDate>
      <amountOfSecuritiesSold>42867</amountOfSecuritiesSold>
      <grossProceeds>1590284.25</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Allen M. Chaves Jr</name>
        <address>
          <com:street1>125 Summer Street</com:street1>
          <com:street2>6th Floor</com:street2>
          <com:city>Boston</com:city>
          <com:stateOrCountry>MA</com:stateOrCountry>
          <com:zipCode>02110</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Series A</securitiesClassTitle>
      <saleDate>11/14/2024</saleDate>
      <amountOfSecuritiesSold>52035</amountOfSecuritiesSold>
      <grossProceeds>1937570.06</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Allen M. Chaves Jr</name>
        <address>
          <com:street1>125 Summer Street</com:street1>
          <com:street2>6th Floor</com:street2>
          <com:city>Boston</com:city>
          <com:stateOrCountry>MA</com:stateOrCountry>
          <com:zipCode>02110</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Series A</securitiesClassTitle>
      <saleDate>11/18/2024</saleDate>
      <amountOfSecuritiesSold>16709</amountOfSecuritiesSold>
      <grossProceeds>578579.08</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Allen M. Chaves Jr</name>
        <address>
          <com:street1>125 Summer Street</com:street1>
          <com:street2>6th Floor</com:street2>
          <com:city>Boston</com:city>
          <com:stateOrCountry>MA</com:stateOrCountry>
          <com:zipCode>02110</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Series A</securitiesClassTitle>
      <saleDate>11/21/2024</saleDate>
      <amountOfSecuritiesSold>100000</amountOfSecuritiesSold>
      <grossProceeds>3615140.00</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Allen M. Chaves Jr</name>
        <address>
          <com:street1>125 Summer Street</com:street1>
          <com:street2>6th Floor</com:street2>
          <com:city>Boston</com:city>
          <com:stateOrCountry>MA</com:stateOrCountry>
          <com:zipCode>02110</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Series A</securitiesClassTitle>
      <saleDate>11/22/2024</saleDate>
      <amountOfSecuritiesSold>150000</amountOfSecuritiesSold>
      <grossProceeds>5512470.00</grossProceeds>
    </securitiesSoldInPast3Months>
    <noticeSignature>
      <noticeDate>11/25/2024</noticeDate>
      <signature>/s/ Eric Janiak, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Allen M. Chaves Jr</signature>
    </noticeSignature>
  </formData>
</edgarSubmission>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
