Form 4: Klaviyo Exec Sells Shares Under 10b5-1 Plan

Klaviyo Co-Chief Executive Andrew Bialecki reported the sale of 200,000 shares of Series A Common Stock for $18.63 per share, executed under a pre-arranged Rule 10b5-1 trading plan.

Summary

• Andrew Bialecki, Co-Chief Executive Officer, Director, and 10% Owner of Klaviyo, Inc., reported a transaction on April 7, 2026.
• The transaction involved the disposition of 200,000 shares of Series A Common Stock.
• These shares were sold at a weighted average price of $18.63 per share, with individual sales ranging from $18.31 to $18.94.
• The sale was conducted under a Rule 10b5-1 trading plan adopted on May 20, 2025, which is designed to satisfy affirmative defense conditions for insider trading.
• Following the transaction, Bialecki beneficially owns a significant number of securities, including Series A and Series B Common Stock held directly and indirectly through various trusts.

Sentiment

Score: 4

Explanation: StockSavvy.ai views this as a neutral to slightly negative filing due to the significant sale by a top executive, even though it was executed under a pre-planned 10b5-1 trading plan.

Negatives

• A significant number of shares (200,000) were sold by a key executive, which could be perceived negatively by the market, despite being executed under a pre-planned trading strategy.

Risks

• The Rule 10b5-1 plan is intended to provide an affirmative defense against allegations of insider trading, but the execution of such a plan can still lead to market perception concerns.
• The weighted average sale price of $18.63 per share, with a range of $18.31 to $18.94, indicates a disposition of equity at a specific market valuation.

Future Outlook

The filing does not contain forward-looking statements or guidance. It solely reports on a past transaction.

Industry Context

StockSavvy.ai notes that insider sales, even under Rule 10b5-1 plans, are closely watched by investors. Such transactions can sometimes signal a lack of confidence in future stock performance or a desire for personal liquidity, although the pre-planned nature of a 10b5-1 trade aims to mitigate these concerns.

Stakeholder Impact

• Shareholders may interpret the sale as a signal of reduced confidence by a key executive, potentially impacting short-term stock sentiment.
• The execution of the sale under a Rule 10b5-1 plan is intended to mitigate concerns about insider trading, providing some reassurance to investors.
• Creditors and suppliers are unlikely to be directly impacted by this specific transaction.

Next Steps

• The reporting person will continue to adhere to the terms of the Rule 10b5-1 trading plan.
• Further transactions may be reported on subsequent Form 4 filings if they occur under the plan or through other means.

Key Dates

Recommendation

The sale was executed under a pre-established Rule 10b5-1 plan, indicating it was planned in advance and not based on recent material non-public information. While a large sale by an executive can be a negative signal, the planned nature of the transaction suggests it's more about personal liquidity or diversification rather than a bearish outlook on the company's future. Therefore, a 'hold' recommendation is appropriate, pending further fundamental analysis of Klaviyo's business performance.

Keywords

Klaviyo, KVYO, Form 4, Insider Trading, Rule 10b5-1, Stock Sale, Beneficial Ownership, Securities Transaction, Andrew Bialecki, Series A Common Stock, Series B Common Stock