Ledger Susan St. - 11 Sep 2026 Form 4 Insider Report for Klaviyo, Inc. (KVYO)

Reporting relationship: Director
Issuer ticker: KVYO
Reported as of: 11 Sep 2026
Net transaction value: -$37,085
SEC form: 4
Accepted by SEC: 14 Sep 2026, 16:49:23 UTC
Prior SEC filing: 11 Jun 2026
Source filing: View source filing
Reporting owner signature: /s/ Landon Edmond, Attorney-in-Fact

Key filing fact

Ledger Susan St. filed Form 4 for Klaviyo, Inc. (KVYO) on 14 Sep 2026.

Key facts

This page summarizes Ledger Susan St.'s Form 4 filing for Klaviyo, Inc. (KVYO).
1 reported transaction and 0 derivative rows are listed below.
Accepted by SEC: 14 Sep 2026, 16:49.

Change

Previous filing in this sequence was filed on 11 Jun 2026.
Current net transaction value: -$37,085.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001673606 Primary reporting owner

St. Ledger Susan

Relationship: Director
Address: C/O KLAVIYO, INC., 125 SUMMER STREET, 6TH FLOOR, BOSTON
Signature: /s/ Landon Edmond, Attorney-in-Fact
Signature date: 14 Sep 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

KVYO transaction

Series A Common Stock

Sale

Transaction value: $37,085
Shares: -2,328
Change %: -9%
Price: $15.93
Shares after: 23,433
Date: 11 Sep 2026
Ownership: Direct
Footnotes: F1, F2

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Rule 10b5-1 trading plan

These transactions were reported as open-market trades under a Rule 10b5-1 plan. The plan lets an insider set trading instructions in advance, which can reduce the risk of trading while in possession of material nonpublic information.

Original filing language: transaction made pursuant to a contract, instruction, or written plan intended to satisfy Rule 10b5-1(c).

Explanation of responses 2 footnotes

Footnote 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.

Footnote 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.