Bialecki Andrew - 31 Dec 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: 222,688,117 shares
Disclosed Ownership: 78,163,529 shares
Ownership: 35%
Form type: SCHEDULE 13G/A
Filing time: 10 Feb 2026, 17:08:33 UTC
Date of event: 31 Dec 2025
Previous filing: 05 Nov 2025
SEC: View on sec.gov

Reporting Managers (1)

Name	Ownership	Shares Owned	sole voting power	shared voting power	Signature	Title	CIK
Bialecki Andrew	35%	78,163,529	78,163,529	0	/s/ Andrew Bialecki	Andrew Bialecki