SUMMIT PARTNERS L P - 30 Sep 2025 SCHEDULE 13G/A Report for Klaviyo, Inc. Series A Common Stock, par value $0.001 per share (KVYO)

Filing Manager
SUMMIT PARTNERS L P
Reporting Manager
Summit Partners, L.P.
Security
Klaviyo, Inc. Series A Common Stock, par value $0.001 per share
Symbol
KVYO
Shares outstanding
156,714,697 shares
Disclosed Ownership
18,852,778 shares
Ownership
12%
Form type
SCHEDULE 13G/A
Filing time
13 Nov 2025, 16:05:02 UTC
Date of event
30 Sep 2025
Previous filing
08 Aug 2025
SEC
View on sec.gov

Reporting Managers (6)

Name Ownership Shares Owned sole voting power shared voting power Signature Title CIK
Summit Partners Growth Equity Fund IX-A, L.P. 7.1% 11,142,414 0 11,142,414 /s/ Adam H. Hennessey, as POA Adam H. Hennessey, as Power of Attorney
Summit Partners Growth Equity Fund IX-B, L.P. 4.4% 6,957,168 0 6,957,168 /s/ Adam H. Hennessey, as POA Adam H. Hennessey, as Power of Attorney
Summit Partners Co-Invest (Kiwi), L.P. 0.44% 687,035 0 687,035 /s/ Adam H. Hennessey, as POA Adam H. Hennessey, as Power of Attorney
Summit Investors GE IX/VC IV, LLC 0.04% 58,561 0 58,561 /s/ Adam H. Hennessey, as POA Adam H. Hennessey, as Power of Attorney
Summit Investors GE IX/VC IV (UK), L.P. 0.01% 7,600 0 7,600 /s/ Adam H. Hennessey, as POA Adam H. Hennessey, as Power of Attorney
Summit Partners, L.P. 12% 18,852,778 0 18,852,778 /s/ Adam H. Hennessey, as POA Adam H. Hennessey, as Power of Attorney