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* Fagnan Jeff (Last) (First) (Middle) 56 WAREHAM STREET, FLOOR 3 (Street) BOSTON MA 02118 (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) Director X 10% Owner Officer (give title below) Other (specify below)
	3. Date of Earliest Transaction (Month/Day/Year) 08/01/2024
	4. If Amendment, Date of Original Filed (Month/Day/Year) 08/02/2024	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	06/17/2024		L	V	21.15	A	$22.5059	21.15	I	See footnote(1)
Series A Common Stock	07/01/2024		L	V	8.021	A	$24.8099	29.171	I	See footnote(1)
Series A Common Stock	07/16/2024		L	V	7.976	A	$25.0752	37.147	I	See footnote(1)
Series A Common Stock	08/01/2024		P		9,485	A	$26.4336(2)	9,485	I	By Tailwater Investors, LLC(3)
Series A Common Stock								26,720	I	By Accomplice Fund I, L.P.(4)

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. Shares held by an immediate family member. The Reporting Person disclaims beneficial ownership of the shares reported herein for purposes of Section 16 of the Securities Exchange Act of 1934, as amended ("Section 16"), except to the extent of his pecuniary interest therein, if any, and the inclusion of these shares in this report shall not be deemed an admission of beneficial ownership of any of the reported shares for purposes of Section 16 or any other purpose.

2. The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $26.3350 to $26.4399, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range.

3. Shares held by Tailwater Investors, LLC, an entity wholly owned by the Reporting Person. The Reporting Person disclaims beneficial ownership of the shares reported herein for purposes of Section 16, except to the extent of his pecuniary interest therein, if any, and the inclusion of these shares in this report shall not be deemed an admission of beneficial ownership of any of the reported shares for purposes of Section 16 or any other purpose.

4. Shares held by Accomplice Fund I, L.P. Accomplice Associates I, LLC is the general partner of Accomplice Fund I, L.P. The Reporting Person is the Class A Member of Accomplice Associates I, LLC. The Reporting Person disclaims beneficial ownership of the shares reported herein for purposes of Section 16, except to the extent of his pecuniary interest therein, if any, and the inclusion of these shares in this report shall not be deemed an admission of beneficial ownership of any of the reported shares for purposes of Section 16 or any other purpose.

Remarks:

This amendment to the Form 4 originally filed by the Reporting Person on August 2, 2024 is being filed to reflect shares of Series A Common Stock acquired by a member of the Reporting Person's immediate family.

	/s/ Frank Castellucci, Attorney-in-Fact for Jeff Fagnan	09/05/2024
	** 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.