Andrew Bialecki - 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: Andrew Bialecki
Reporting Manager: Bialecki Andrew
Security: Klaviyo, Inc. (the "Issuer") Series A common stock, par value $0.001 per share (the "Series A Common Stock")
Symbol: KVYO
Shares outstanding: 220M shares
Disclosed Ownership: 83.1M shares
Ownership: 37.7%
Form type: SCHEDULE 13G/A
Filing time: 05 Nov 2025, 16:17:46 UTC
Date of event: 30 Sep 2025
Previous filing: 05 Aug 2025
SEC: View on sec.gov

Reporting Managers (1)

Name	Ownership	Shares Owned	sole voting power	shared voting power	Signature	Title	CIK
Bialecki Andrew	37.7%	83.1M	83.1M	0	/s/ Andrew Bialecki	Andrew Bialecki