Form 4: Klaviyo Insider Sells 200,000 Shares

Klaviyo Co-CEO Andrew Bialecki sold 200,000 shares of Series A Common Stock for approximately $19.42 per share, totaling $3.88 million, as part of a pre-arranged trading plan.

Summary

• Andrew Bialecki, Co-Chief Executive Officer, Director, and 10% owner of Klaviyo, Inc., reported the sale of 200,000 shares of Series A Common Stock.
• The transactions occurred on March 31, 2026, and were executed under a Rule 10b5-1 trading plan adopted on May 20, 2025.
• The sale generated approximately $3.88 million, with shares sold at a weighted average price of $19.42, ranging from $18.85 to $19.75.
• Following these transactions, Bialecki directly beneficially owns 0 shares of Series A Common Stock.
• However, Bialecki indirectly beneficially owns a significant number of shares through various trusts, including the Andrew P. Bialecki Grantor Retained Annuity Trust I of 2023, the Elizabeth L. Bialecki Irrevocable GST Trust of 2023, and the Andrew P. Bialecki Irrevocable GST Trust of 2023, as well as shares held by his spouse.

Sentiment

Score: 3

Explanation: StockSavvy.ai views this as a slightly negative development due to the significant sale by a top executive, despite being executed under a 10b5-1 plan.

Negatives

• A significant number of shares (200,000) were sold by a key executive, potentially signaling a lack of confidence or a need for personal liquidity.

Risks

• The sale of a substantial number of shares by a Co-CEO could be interpreted negatively by the market, potentially impacting investor sentiment.
• The Rule 10b5-1 trading plan, while providing a defense against insider trading allegations, still represents a divestment of company stock by a top executive.

Future Outlook

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

Industry Context

StockSavvy.ai notes that insider selling, especially by C-suite executives, is a common event and often executed under pre-arranged 10b5-1 plans to diversify or meet personal financial needs. However, the volume and timing relative to company performance can influence market perception.

Stakeholder Impact

• Shareholders: May view the sale as a negative signal, potentially impacting share price in the short term.
• Employees: May be concerned about executive confidence in the company's future prospects.
• Management: The sale is executed under a plan designed to comply with regulations, but the volume could still raise questions about personal financial priorities.

Next Steps

• Monitor future insider trading activity for any further sales or purchases.
• Analyze Klaviyo's upcoming financial reports and strategic announcements for context regarding executive compensation and liquidity needs.

Key Dates

Recommendation

The sale by a key executive, while notable, was conducted under a pre-arranged 10b5-1 plan, mitigating immediate concerns of opportunistic selling. The filing itself does not provide performance data or future guidance to warrant a strong buy or sell. Therefore, a 'hold' recommendation is appropriate pending further company disclosures and market analysis.

Keywords

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