Summit Partners L P - Mar 31, 2025 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.	17.74%	22.9M	22.9M	/s/ Adam H. Hennessey, as POA	Adam H. Hennessey, as Power of Attorney
Summit Partners Growth Equity Fund IX-B, L.P.	11.08%	14.3M	14.3M	/s/ Adam H. Hennessey, as POA	Adam H. Hennessey, as Power of Attorney
Summit Partners Co-Invest (Kiwi), L.P.	1.09%	1.41M	1.41M	/s/ Adam H. Hennessey, as POA	Adam H. Hennessey, as Power of Attorney
Summit Investors GE IX/VC IV, LLC	0.09%	121K	121K	/s/ Adam H. Hennessey, as POA	Adam H. Hennessey, as Power of Attorney
Summit Investors GE IX/VC IV (UK), L.P.	0.01%	15.7K	15.7K	/s/ Adam H. Hennessey, as POA	Adam H. Hennessey, as Power of Attorney
Summit Partners, L.P.	30.02%	38.8M	38.8M	/s/ Adam H. Hennessey, as POA	Adam H. Hennessey, as Power of Attorney

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