Form 4: Klaviyo CEO Andrew Bialecki Executes Stock Sale

Klaviyo Co-CEO Andrew Bialecki sold 200,000 shares of Series A Common Stock pursuant to a pre-arranged Rule 10b5-1 trading plan.

Summary

• Co-CEO Andrew Bialecki converted 200,000 shares of Series B Common Stock into Series A Common Stock.
• The converted shares were subsequently sold in two tranches on April 14, 2026.
• The first tranche of 109,142 shares was sold at a weighted average price of $17.39.
• The second tranche of 90,858 shares was sold at a weighted average price of $16.94.
• The transactions were executed under a Rule 10b5-1 trading plan adopted on May 20, 2025.

Sentiment

Score: 5

Explanation: StockSavvy.ai views this as a neutral event, as the sale was executed through a pre-planned 10b5-1 program and represents a small fraction of the executive's total holdings.

Positives

• The sale was conducted via a pre-established Rule 10b5-1 plan, which is a standard mechanism for insiders to sell stock without triggering concerns regarding non-public information.

Negatives

• The transaction represents a divestment of 200,000 shares by the Co-CEO, which may be perceived as a reduction in direct equity stake.

Risks

• Insider selling activity can sometimes influence market sentiment negatively, regardless of the pre-planned nature of the trades.

Future Outlook

No specific forward-looking guidance regarding company operations was provided in this filing.

Industry Context

StockSavvy.ai notes that insider selling via 10b5-1 plans is a common practice among technology executives to manage personal liquidity and diversification, and generally does not signal a lack of confidence in the company's long-term prospects.

Comparison to Industry Standards

• The use of Rule 10b5-1 plans is the industry standard for corporate officers to conduct orderly divestments.
• The scale of the sale is relatively minor compared to the reporting person's total beneficial ownership of 67,344,118 shares.

Related Party Transactions

• The filing discloses holdings by various trusts associated with the reporting person, including the Andrew P. Bialecki Grantor Retained Annuity Trust I of 2023 and the Elizabeth L. Bialecki Irrevocable GST Trust of 2023.

Stakeholder Impact

• Minimal impact expected as the sale was pre-planned and represents a small portion of the total outstanding shares held by the insider.

Next Steps

• Continued monitoring of future Form 4 filings for further insider activity.

Key Dates

Keywords

Klaviyo, KVYO, Insider Trading, Form 4, Andrew Bialecki, Stock Sale