May 29, 2026

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Multiple insiders at Klaviyo, Inc. (NYSE: KVYO) reported stock sales totaling approximately $9.3 million in May, according to Form 4 filings with the U.S. Securities and Exchange Commission (SEC).
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The reported sales involved Director, Co-Chief Executive Officer, and 10% owner Andrew Bialecki, Chief Financial Officer Amanda Whalen, and director Susan St. Ledger.
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Klaviyo is a marketing automation and customer data platform that helps businesses manage email, SMS, customer segmentation, analytics, and personalized digital marketing campaigns.

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Co-CEO Sales Drive Most of the May Total

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Andrew Bialecki accounted for most of the May selling activity.
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Bialecki sold 200,000 shares on May 12 at $14.61 per share for approximately $2.9 million. He sold another 200,000 shares on May 19 at $14.88 per share for approximately $3.0 million. He then sold 212,529 shares on May 26 at $14.61 per share for approximately $3.1 million.
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Across those completed transactions, Bialecki sold approximately $9.0 million worth of KVYO stock.

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CFO and Director Sales Add to the Cluster

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Amanda Whalen, Klaviyo’s Chief Financial Officer, sold 14,000 shares on May 14 at $14.26 per share for approximately $199,600. After the sale, Whalen owned 895,141 shares directly.
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Susan St. Ledger, a director, sold 9,334 shares on May 18 at $14.27 per share for approximately $133,200. After the sale, St. Ledger owned 10,939 shares directly.

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Clustered Selling Draws Attention, But Planned Sales Lower the Signal

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The May selling is notable because it involved the company’s Co-Chief Executive Officer, Chief Financial Officer, and a director within the same month.
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Insider sales above $1 million are generally worth reviewing, while CEO or CFO sales above $2.5 million tend to draw greater investor attention. Bialecki’s completed May sales exceeded that threshold.
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The filings indicate that at least some of Bialecki’s sales were made under a Rule 10b5-1 trading plan. That lowers the signal strength compared with discretionary open-market selling.

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Proposed Sales Should Not Be Double-Counted

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The filings also included proposed sales tied to Andrew Bialecki and Susan St. Ledger.
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Those proposed sales appear connected to reported sale activity and should not be double-counted against completed insider sale totals unless confirmed as separate transactions.

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The Bigger Picture: Insider Selling Requires Context

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Insider selling becomes more relevant when it involves senior leadership, exceeds common dollar thresholds, or clusters across several executives and directors.
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Platforms like LevelFields aggregate insider transactions and flag when activity exceeds key thresholds, helping investors identify when insider buying has historically aligned with meaningful stock movements.