SEC FORM 3

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^*

Bialecki Andrew

(Last)

(First)

(Middle)

C/O KLAVIYO, INC.

125 SUMMER STREET, 6TH FLOOR

(Street)

BOSTON

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)

X	Director	X	10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Executive 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)
1. Title of Derivative Security (Instr. 4)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	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)
Series B Common Stock	⁽¹⁾	⁽¹⁾	Series A Common Stock	60,359,000	⁽¹⁾	D
Series B Common Stock	⁽¹⁾	⁽¹⁾	Series A Common Stock	16,000,000	⁽¹⁾	I	By The Andrew P. Bialecki Grantor Retained Annuity Trust I of 2023⁽²⁾
Series B Common Stock	⁽¹⁾	⁽¹⁾	Series A Common Stock	517,006	⁽¹⁾	I	By The Andrew P. Bialecki Irrevocable GST Trust of 2023⁽³⁾
Series B Common Stock	⁽¹⁾	⁽¹⁾	Series A Common Stock	517,006	⁽¹⁾	I	By The Elizabeth L. Bialecki Irrevocable GST Trust of 2023⁽⁴⁾
Series B Common Stock	⁽¹⁾	⁽¹⁾	Series A Common Stock	43,218	⁽¹⁾	I	By spouse
Stock Option (Right to Buy)	⁽⁵⁾	08/31/2025	Series B Common Stock	15,829,184	$0.0125	D
Stock Option (Right to Buy)	⁽⁵⁾	09/28/2025	Series B Common Stock	5,600,000	$0.0125	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. Shares held by the Andrew P. Bialecki Grantor Retained Annuity Trust I of 2023, of which the Reporting Person serves as trustee. The Reporting Person disclaims Section 16 beneficial ownership of such shares except to the extent of his pecuniary interest therein, if any, and this report shall not be deemed to be an admission that he has beneficial ownership of such shares for Section 16 or any other purpose.

3. Shares held by the Andrew P. Bialecki Irrevocable GST Trust of 2023, of which the Reporting Persons spouse serves as a trustee. The Reporting Person disclaims Section 16 beneficial ownership of such shares except to the extent of his pecuniary interest therein, if any, and this report shall not be deemed to be an admission that he has beneficial ownership of such shares for Section 16 or any other purpose.

4. Shares held by the Elizabeth L. Bialecki Irrevocable GST Trust of 2023, of which the Reporting Person serves as a trustee. The Reporting Person disclaims Section 16 beneficial ownership of such shares except to the extent of his pecuniary interest therein, if any, and this report shall not be deemed to be an admission that he has beneficial ownership of such shares for Section 16 or any other purpose.

5. The shares underlying this option are fully vested and exercisable as of the date hereof.

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).
** 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.