Ed Hallen - 30 Sep 2025 SCHEDULE 13G/A Report for Klaviyo, Inc. (the "Issuer") Series A common stock, par value $0.001 per share (the "Series A Common Stock") (KVYO)

Filing Manager: Ed Hallen
Reporting Manager: Hallen Ed
Security: Klaviyo, Inc. (the "Issuer") Series A common stock, par value $0.001 per share (the "Series A Common Stock")
Symbol: KVYO
Shares outstanding: 169M shares
Disclosed Ownership: 32.9M shares
Ownership: 19.4%
Form type: SCHEDULE 13G/A
Filing time: 05 Nov 2025, 16:19:20 UTC
Date of event: 30 Sep 2025
SEC: View on sec.gov

Reporting Managers (1)

Name	Ownership	Shares Owned	sole voting power	shared voting power	Signature	Title	CIK
Hallen Ed	19.4%	32.9M	32.9M	0	/s/ Ed Hallen	Ed Hallen