Klaviyo director sells 2,328 shares at $15.93

Klaviyo, Inc. (KVYO) director Susan St.

Rhea-AI Filing Summary

Klaviyo, Inc. (KVYO) director Susan St. Ledger reported selling 2,328 shares of Series A Common Stock on September 11, 2026 at $15.93 per share in an open-market transaction made under a Rule 10b5-1 trading plan adopted on June 12, 2026. After this sale, her equity position consists of 8,611 shares of Series A Common Stock and 14,822 unvested restricted stock units, each RSU representing a contingent right to receive one share upon vesting and settlement.

Insider Trade Summary 10b5-1

Net Seller: 2,328 shares

Net Sell 1 txn

Insider St. Ledger Susan

Role Director

Sold 2,328 shs ($37K)

Type	Security	Shares	Price	Value
Sale	Series A Common Stock F1, F2	2,328	$15.93	$37K

Holdings After Transaction: Series A Common Stock — 23,433 shares (Direct)

Footnotes (2)

1. F1. These transactions were effected by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 12, 2026.
2. F2. Consists of (i) 8,611 shares of Series A Common Stock and (ii) 14,822 unvested restricted stock units 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.

Key Figures

Shares sold: 2,328 shares Sale price per share: $15.93 per share Shares held after transaction: 8,611 shares +1 more

4 metrics

Shares sold 2,328 shares Series A Common Stock sold by director on September 11, 2026

Sale price per share $15.93 per share Open-market or private sale of KVYO Series A Common Stock

Shares held after transaction 8,611 shares Series A Common Stock directly held after the reported sale

Unvested RSUs after transaction 14,822 RSUs Unvested restricted stock units, each RSU representing one share upon vesting

Key Terms

Rule 10b5-1 trading plan, restricted stock units, Series A Common Stock

3 terms

Rule 10b5-1 trading plan regulatory

"transactions were effected by the Reporting Person pursuant to a Rule 10b5-1 trading plan"

A Rule 10b5-1 trading plan is a pre-arranged schedule that allows company insiders to buy or sell stock at specific times, even if they have inside information. It helps prevent accusations of unfair trading by making these transactions look planned and transparent, rather than sneaky or illegal.

restricted stock units financial

"14,822 unvested restricted stock units awarded under the Issuer's 2023 Stock Option"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

Series A Common Stock financial

"Consists of (i) 8,611 shares of Series A Common Stock and (ii) 14,822 unvested"

Series A common stock is a specific class of a company’s ordinary shares issued during an early formal funding round, carrying the ownership rights and voting power tied to that class. For investors it signals an early-stage equity claim with potential upside if the business grows, but also greater risk and typically less liquidity than shares in mature, publicly traded firms—imagine buying a seat on a startup’s team before the company has proven itself.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did Klaviyo (KVYO) disclose for Susan St. Ledger?

Klaviyo reported that director Susan St. Ledger sold 2,328 shares of Series A Common Stock on September 11, 2026 in an open-market or private sale at $15.93 per share.

Was the KVYO insider sale by Susan St. Ledger under a Rule 10b5-1 plan?

Yes. The filing states the transactions were effected under a Rule 10b5-1 trading plan adopted by Susan St. Ledger on June 12, 2026, indicating the trades were pre-arranged.

How many Klaviyo (KVYO) shares did Susan St. Ledger hold after the reported sale?

After the sale, Susan St. Ledger’s position consisted of 8,611 shares of Series A Common Stock and 14,822 unvested restricted stock units, each RSU representing a contingent right to receive one Series A share upon vesting and settlement.

What price did Susan St. Ledger receive for the KVYO shares sold?

The reported sale price was $15.93 per share for the 2,328 shares of Klaviyo Series A Common Stock sold on September 11, 2026.

What type of security did Susan St. Ledger trade in the KVYO Form 4?

The transaction involved Series A Common Stock of Klaviyo, Inc., with 2,328 shares sold and continuing holdings including both common shares and unvested restricted stock units tied to Series A Common Stock.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 09/14/2026 - 04:59 PM Accepted by SEC EDGAR 09/14/2026 - 04:49 PM Learn about SEC filing dates

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).

X

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^*

St. Ledger Susan

(Last) (First) (Middle)

C/O KLAVIYO, INC.

125 SUMMER STREET, 6TH FLOOR

(Street)

BOSTON MASSACHUSETTS 02110

(City) (State) (Zip)

UNITED STATES

(Country)

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
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
09/11/2026

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

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

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

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	09/11/2026		S(1)		2,328	D	$15.93	23,433(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. These transactions were effected by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 12, 2026.

2. Consists of (i) 8,611 shares of Series A Common Stock and (ii) 14,822 unvested restricted stock units 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	09/14/2026
	** 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.
* Form 4: SEC 1474 (03-26)