Andrew Bialecki - Sep 30, 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: Bialecki Andrew
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
Date filed: 11/5/2025, 04:17 PM
Date of event: Sep 30, 2025
Previous filing: Aug 5, 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