SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person* Chaves Allen (Last) (First) (Middle) C/O KLAVIYO, INC. 125 SUMMER STREET 6TH FLOOR (Street) BOSTON MA 02110 (City) (State) (Zip)	2. Date of Event Requiring Statement (Month/Day/Year) 09/20/2023	3. Issuer Name and Ticker or Trading Symbol Klaviyo, Inc. [ KVYO ]
		4. Relationship of Reporting Person(s) to Issuer (Check all applicable) Director 10% Owner X Officer (give title below) Other (specify below) Chief Technology Officer	5. 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 Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Series B Common Stock	(1)	(1)	Series A Common Stock	227,966(2)	(1)	D
Stock Option (Right to Buy)	(3)	04/15/2030	Series B Common Stock	1,321,426	$3.055	D

Explanation of Responses:

1. Each share of Series B Common Stock is convertible at any time at the option of the holder into one share of Series A Common Stock of the Issuer, and will automatically convert into Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date.

2. Amount consists of (a) 65,466 shares of Series B Common Stock and (b) 162,500 unvested RSUs awarded under the 2015 Stock Incentive Plan, each representing the contingent right to receive one share of Series B Common Stock upon vesting and settlement. The RSUs vest as follows: 108,875 RSUs vest in four equal quarterly installments beginning on February 15, 2024, and the remaining 53,625 RSUs vest in four equal quarterly installments beginning on February 15, 2025, subject to the Reporting Persons continued service on each such vesting date.

3. 25% of the shares subject to this option vested and became exercisable on December 27, 2020, with the remainder vesting in thirty-six equal monthly installments thereafter, subject to the Reporting Persons continued service on each such vesting date.

Remarks:

Exhibit 24 Power of Attorney

	/s/ Landon Edmond, Attorney-in-Fact	09/20/2023
	** 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 5 (b)(v).
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