Klaviyo, Inc. SEC Filings

Klaviyo, Inc. filed a Form 144 reporting a proposed sale of 145,768 shares of its Series A common stock, with an aggregate market value of $4,839,497.60. The shares are scheduled for sale on 09/08/2025 on the NYSE. The filer acquired 1,983,585 shares on 09/20/2023 in pre-IPO transactions from Klaviyo, Inc., and indicates the purchase was paid with equity interests in the issuer. No securities of the issuer were reported sold by the filer in the past three months. The filing includes the required representation that the seller is not aware of undisclosed material adverse information about the company.

Klaviyo, Inc. (KVYO) filed a Form 144 reporting a proposed sale of 1,476,104 Series A common shares, with an aggregate market value of $49,006,652.80. The shares represent a portion of the company's 116,897,730 outstanding shares and are slated for sale on or about 09/08/2025 through Barclays Capital Inc. The filing states these shares were acquired 09/20/2023 in pre-IPO transactions from Klaviyo, Inc., totaling 20,086,500 shares acquired then, with equity interests purchased pre-IPO as the form of payment. The filer affirms they are unaware of undisclosed material adverse information regarding the issuer.

Klaviyo, Inc. (KVYO) filed a Form 144 reporting a proposed sale of 2,364,090 shares of Series A common stock through Barclays Capital, with an aggregate market value of $78,487,788. The notice lists the number of outstanding shares as 116,897,730 and an approximate date of sale of 09/08/2025.

The filing states these shares were acquired in pre-IPO transactions on 09/20/2023 from Klaviyo, Inc., totaling 32,170,006 shares acquired on that date. No securities sales in the past three months were reported, and the filer affirms there is no undisclosed material adverse information.

Andrew P. Bialecki, Klaviyo, Inc. director, CEO and reported 10% owner, effected transactions on 09/02/2025 under a Rule 10b5-1 trading plan adopted May 20, 2025. He converted 223,304 shares of Series B common stock into Series A common stock and subsequently sold the converted shares in two sets of transactions: 128,877 shares at a weighted average price of $31.18 (sales ranged $30.88–$31.87) and 94,427 shares at a weighted average price of $30.76 (sales ranged $30.61–$30.87), resulting in 0 direct Series A shares remaining from this block. The Form 4 discloses additional indirect holdings of Series A shares held in several family trusts and by a spouse where the reporting person disclaims beneficial ownership except to the extent of any pecuniary interest.

Klaviyo appointed board member Chano Ferne1ndez as Interim Executive Officer effective September 1, 2025, under a Service Agreement with Klaviyo Ltd. The initial fixed term runs through December 31, 2025, and either party may terminate with one months notice. During the appointment Mr. Ferne1ndez will report to CEO Andrew Bialecki and will cease serving as Chairperson and member of the Compensation Committee.

The Service Agreement sets a monthly base salary of A361,618 GBP. An RSU Intention Letter contemplates a restricted stock unit award with an initial equity value of $3,200,000 that will vest in one installment on November 15, 2025. He will not receive board compensation while serving as Interim Executive Officer.

Andrew P. Bialecki, Chief Executive Officer and director of Klaviyo, Inc. (KVYO), reported multiple transactions on August 26 and August 28, 2025. On August 26 he converted 226,702 shares of Series B into Series A and sold 216,433 shares at a weighted average price of $31.51 and 10,269 shares at a weighted average price of $31.21. On August 28 he converted 3,500,000 Series B shares into Series A and directed a bona fide gift of those 3,500,000 shares to a donor-advised fund; those gifted shares are subject to a 60-day lock-up following August 13, 2025. The August 26 trades were effected under a Rule 10b5-1 trading plan adopted May 20, 2025. The filing discloses various indirect holdings held in trusts and by his spouse, and includes certifications and signatures by an attorney-in-fact.

Klaviyo, Inc. (KVYO) Form 4 reports that Summit Partners-affiliated entities effected transactions on 08/25/2025. The filing shows 975,000 shares acquired as Series B common stock (convertible into Series A) and a contemporaneous sale of 975,000 shares of Series A common stock at $30.01 per share. The reporting group collectively beneficially owns 22,852,778 shares (on an indicated Series A-equivalent basis) across multiple Summit funds. The filing is executed by Adam Hennessey as attorney-in-fact for the Summit reporting persons and includes explanatory footnotes describing the ownership and control structure within the Summit Partners organization.

Klaviyo, Inc. (KVYO) Form 144 notice reports a proposed sale of 2,333,334 shares of common stock through Morgan Stanley Smith Barney, with an aggregate market value of $73,663,354.38. The shares represent approximately 2.0% of the 116,897,730 shares outstanding and are scheduled for sale on 08/26/2025 on the NYSE. The securities were acquired on 05/14/2025 through previously exercised stock options and were paid for in cash. The filing also discloses a prior sale by Andrew Bialecki of 100,000 shares on 06/17/2025 for $3,441,330.00. The filer affirms no undisclosed material adverse information and includes broker contact details for the planned sale.

Summit Partners entities reported the disposition of 500,000 shares of Klaviyo, Inc. Series A common stock on 08/21/2025; the sale is reported as a distribution to facilitate bona fide charitable gifts and was effected at a $0 price in the Form 4 filing. Following the reported transaction, the reporting persons show 0 shares beneficially owned. The filing identifies Summit Partners, L.P. as manager of the funds holding the shares and names three investment committee members who may be deemed to have voting and dispositive authority, while disclaiming beneficial ownership except for any pecuniary interest.