Summit Partners L P - Dec 31, 2024 SCHEDULE 13G/A Report for Klaviyo, Inc. Series A Common Stock, par value $0.001 per share (KVYO)

Reporting Managers (6)

Name	Ownership	Shares Owned	shared voting power	Signature	Title
Summit Partners Growth Equity Fund IX-A, L.P.	20.17%	24.1M	24.1M	/s/ Adam H. Hennessey, as POA	Adam H. Hennessey, as Power of Attorney
Summit Partners Growth Equity Fund IX-B, L.P.	12.59%	15.1M	15.1M	/s/ Adam H. Hennessey, as POA	Adam H. Hennessey, as Power of Attorney
Summit Partners Co-Invest (Kiwi), L.P.	1.24%	1.49M	1.49M	/s/ Adam H. Hennessey, as POA	Adam H. Hennessey, as Power of Attorney
Summit Investors GE IX/VC IV, LLC	0.11%	127K	127K	/s/ Adam H. Hennessey, as POA	Adam H. Hennessey, as Power of Attorney
Summit Investors GE IX/VC IV (UK), L.P.	0.01%	16.5K	16.5K	/s/ Adam H. Hennessey, as POA	Adam H. Hennessey, as Power of Attorney
Summit Partners, L.P.	34.13%	40.8M	40.8M	/s/ Adam H. Hennessey, as POA	Adam H. Hennessey, as Power of Attorney

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