<SEC-DOCUMENT>0001628280-23-031916-index.html : 20230911
<SEC-HEADER>0001628280-23-031916.hdr.sgml : 20230911
<ACCEPTANCE-DATETIME>20230911060520
ACCESSION NUMBER:		0001628280-23-031916
CONFORMED SUBMISSION TYPE:	S-1/A
PUBLIC DOCUMENT COUNT:		29
FILED AS OF DATE:		20230911
DATE AS OF CHANGE:		20230911

FILER:

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

	FILING VALUES:
		FORM TYPE:		S-1/A
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	333-274211
		FILM NUMBER:		231246579

	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
</SEC-HEADER>
<DOCUMENT>
<TYPE>S-1/A
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<FILENAME>klaviyoincs-1a.htm
<DESCRIPTION>S-1/A
<TEXT>
Document 1 - file: klaviyoincs-1a.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-FILING FEES
<SEQUENCE>2
<FILENAME>exhibit107-sx1a.htm
<DESCRIPTION>EX-FILING FEES
<TEXT>
Document 2 - file: exhibit107-sx1a.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-1.1
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<FILENAME>exhibit11-sx1a.htm
<DESCRIPTION>EX-1.1
<TEXT>
Document 3 - file: exhibit11-sx1a.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-5.1
<SEQUENCE>4
<FILENAME>exhibit51-sx1a.htm
<DESCRIPTION>EX-5.1
<TEXT>
Document 4 - file: exhibit51-sx1a.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-10.3
<SEQUENCE>5
<FILENAME>exhibit103-sx1a.htm
<DESCRIPTION>EX-10.3
<TEXT>
Document 5 - file: exhibit103-sx1a.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-10.14
<SEQUENCE>6
<FILENAME>exhibit1014-sx1a.htm
<DESCRIPTION>EX-10.14
<TEXT>
Document 6 - file: exhibit1014-sx1a.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-23.1
<SEQUENCE>7
<FILENAME>exhibit231-sx1a.htm
<DESCRIPTION>EX-23.1
<TEXT>
Document 7 - file: exhibit231-sx1a.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>8
<FILENAME>business10a.jpg
<TEXT>
Document 8 - file: business10a.jpg

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<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>9
<FILENAME>business11a.jpg
<TEXT>
Document 9 - file: business11a.jpg

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<DOCUMENT>
<TYPE>GRAPHIC
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<FILENAME>business12a.jpg
<TEXT>
Document 10 - file: business12a.jpg

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<DOCUMENT>
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Document 11 - file: business13a.jpg

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<DOCUMENT>
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<FILENAME>business1a.jpg
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Document 12 - file: business1a.jpg

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<DOCUMENT>
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<FILENAME>business2a.jpg
<TEXT>
Document 13 - file: business2a.jpg

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<DOCUMENT>
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<FILENAME>business3a.jpg
<TEXT>
Document 14 - file: business3a.jpg

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<DOCUMENT>
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<FILENAME>business4a.jpg
<TEXT>
Document 15 - file: business4a.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
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<FILENAME>business4b.jpg
<TEXT>
Document 16 - file: business4b.jpg

</DOCUMENT>
<DOCUMENT>
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<FILENAME>business5d.jpg
<TEXT>
Document 17 - file: business5d.jpg

</DOCUMENT>
<DOCUMENT>
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<SEQUENCE>18
<FILENAME>business6b.jpg
<TEXT>
Document 18 - file: business6b.jpg

</DOCUMENT>
<DOCUMENT>
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<FILENAME>business7b.jpg
<TEXT>
Document 19 - file: business7b.jpg

</DOCUMENT>
<DOCUMENT>
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<FILENAME>business8b.jpg
<TEXT>
Document 20 - file: business8b.jpg

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<DOCUMENT>
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<FILENAME>business9b.jpg
<TEXT>
Document 21 - file: business9b.jpg

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<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>22
<FILENAME>coverart1a.jpg
<TEXT>
Document 22 - file: coverart1a.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>23
<FILENAME>coverart2b.jpg
<TEXT>
Document 23 - file: coverart2b.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>24
<FILENAME>covertart3b.jpg
<TEXT>
Document 24 - file: covertart3b.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>25
<FILENAME>deloittelogo.jpg
<TEXT>
Document 25 - file: deloittelogo.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>26
<FILENAME>goodwinlogo.jpg
<TEXT>
Document 26 - file: goodwinlogo.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>27
<FILENAME>klaviyologo.jpg
<TEXT>
Document 27 - file: klaviyologo.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>28
<FILENAME>mda1b.jpg
<TEXT>
Document 28 - file: mda1b.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>29
<FILENAME>mda2a.jpg
<TEXT>
Document 29 - file: mda2a.jpg

</DOCUMENT>
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