Gomez Luciano Fernandez - 15 Sep 2025 Form 4 Insider Report for Klaviyo, Inc. (KVYO)

Role: Interim Executive Officer, Director
Signature: /s/ Landon Edmond, Attorney-in-Fact
Issuer symbol: KVYO
Transactions as of: 15 Sep 2025
Net transactions value: $0
Form type: 4
Filing time: 17 Sep 2025, 16:19:32 UTC
Previous filing: 19 Aug 2025
Next filing: 18 Nov 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Fernandez Gomez Luciano	Interim Executive Officer, Director	C/O KLAVIYO, INC. 125 SUMMER STREET, 6TH FLOOR, BOSTON	/s/ Landon Edmond, Attorney-in-Fact	17 Sep 2025	0001730978

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	KVYO	Series A Common Stock	Award	$0	+100,597	+376%	$0.000000	127,385	15 Sep 2025	Direct	F1, F2

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	Represents restricted stock units ("RSUs") awarded under the Issuer's 2023 Stock Option and Incentive Plan, each representing the contingent right to receive one share of the Issuer's Series A Common Stock, par value $0.001 per share ("Series A Common Stock"), upon vesting and settlement. The RSUs vest in full on November 15, 2025, subject to the Reporting Person's continued service on the vesting date.
F2	Consists of (i) 20,968 shares of Series A Common Stock and (ii) 106,417 unvested RSUs awarded under the Issuer's 2023 Stock Option and Incentive Plan, each representing the contingent right to receive one share of Series A Common Stock upon vesting and settlement.

Content

Represents restricted stock units ("RSUs") awarded under the Issuer's 2023 Stock Option and Incentive Plan, each representing the contingent right to receive one share of the Issuer's Series A Common Stock, par value $0.001 per share ("Series A Common Stock"), upon vesting and settlement. The RSUs vest in full on November 15, 2025, subject to the Reporting Person's continued service on the vesting date.

Consists of (i) 20,968 shares of Series A Common Stock and (ii) 106,417 unvested RSUs awarded under the Issuer's 2023 Stock Option and Incentive Plan, each representing the contingent right to receive one share of Series A Common Stock upon vesting and settlement.