[Form 4] Klaviyo, Inc. Insider Trading Activity

Rhea-AI Filing Summary

Luciano Fernandez Gomez, Interim Executive Officer and director of Klaviyo, Inc. (KVYO) reported a securities transaction dated 09/15/2025. The filing shows an award of 100,597 restricted stock units (RSUs) under the issuer's 2023 Stock Option and Incentive Plan, recorded as an acquisition at $0. The RSUs vest in full on November 15, 2025, subject to continued service. After the reported transaction the reporting person beneficially owns 127,385 shares equivalent, consisting of 20,968 shares of Series A Common Stock and 106,417 unvested RSUs. The Form 4 was submitted via attorney-in-fact Landon Edmond and signed on 09/17/2025.

Positive

• 100,597 RSUs granted under the 2023 Stock Option and Incentive Plan, increasing equity alignment
• Clear vesting schedule: RSUs vest in full on November 15, 2025, subject to continued service
• Total beneficial ownership disclosed: 127,385 shares-equivalent (20,968 shares plus 106,417 unvested RSUs)

Negative

• None.

Insights

Financial Analyst

TL;DR: Executive received a sizable RSU grant increasing equity stake; vesting is time-based and completes on Nov 15, 2025.

The Form 4 documents a non-cash equity award of 100,597 RSUs granted to an interim executive officer and director, increasing reported beneficial ownership to 127,385 shares-equivalent. The award vests in full on a single date, November 15, 2025, subject to continued service, indicating a time-based retention incentive rather than performance-based compensation. The reported acquisition price is $0, consistent with typical RSU grants that settle into shares upon vesting. For investors, this is a routine equity compensation disclosure showing management alignment with shareholder value through equity ownership.

Corporate Governance Expert

TL;DR: Routine insider grant disclosed properly; filing identifies role and vesting schedule clearly.

The Form 4 identifies the reporting person as both a director and an interim executive officer and discloses the receipt of 100,597 RSUs under the 2023 Stock Option and Incentive Plan. The vesting terms are explicitly stated (full vesting on November 15, 2025) and the filing was executed by an attorney-in-fact, with signature dated 09/17/2025. The disclosure follows Section 16 reporting requirements and provides clear information on direct beneficial ownership (20,968 shares) and unvested RSUs (106,417). No governance issues or deviations from standard disclosure practices are evident from the document text.

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Fernandez Gomez Luciano

(Last) (First) (Middle)

C/O KLAVIYO, INC. 125 SUMMER STREET

6TH FLOOR

(Street)

BOSTON MA 02110

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
Klaviyo, Inc. [ KVYO ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Interim Executive Officer

3. Date of Earliest Transaction (Month/Day/Year)
09/15/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Series A Common Stock	09/15/2025		A		100,597(1)	A	$0	127,385(2)	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. 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.

2. 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.

Remarks:

	/s/ Landon Edmond, Attorney-in-Fact	09/17/2025
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

What did the Form 4 for KVYO report on 09/15/2025?

The Form 4 reports an acquisition of 100,597 RSUs by Luciano Fernandez Gomez on 09/15/2025, recorded at $0 and filed 09/17/2025.

How many shares does the reporting person beneficially own after the transaction?

The reporting person beneficially owns 127,385 shares-equivalent, consisting of 20,968 Series A common shares and 106,417 unvested RSUs.

When do the RSUs vest according to the Form 4?

The RSUs vest in full on November 15, 2025, subject to the reporting person's continued service on the vesting date.

What is the nature of the RSU award disclosed in the Form 4?

The RSUs represent the contingent right to receive one share of Series A Common Stock upon vesting and settlement and were awarded under the issuer's 2023 Stock Option and Incentive Plan.

Who signed and filed the Form 4 for this transaction?

The Form 4 was submitted and signed by attorney-in-fact Landon Edmond on 09/17/2025.