Form 4: Klaviyo CEO Andrew Bialecki Executes Stock Sale

Klaviyo Co-CEO Andrew Bialecki sold 212,529 shares of Series A Common Stock via a pre-arranged Rule 10b5-1 trading plan.

Summary

• Co-CEO Andrew Bialecki converted 212,529 shares of Series B Common Stock into Series A Common Stock.
• The converted shares were subsequently sold at a weighted average price of $14.61 per share.
• The transactions were executed on May 26, 2026, pursuant to a Rule 10b5-1 trading plan adopted on May 20, 2025.
• The sale represents a routine divestment by an insider under a pre-established plan.

Sentiment

Score: 5

Explanation: StockSavvy.ai views this as a neutral event, as the sale was executed under a pre-existing 10b5-1 plan and does not necessarily reflect a change in the executive's confidence in the company.

Positives

• The transaction was conducted under a pre-planned Rule 10b5-1 trading plan, which is designed to avoid concerns regarding insider trading based on non-public information.

Negatives

• The sale reduces the direct beneficial ownership of the Co-CEO in the company.

Risks

• Continued reliance on Rule 10b5-1 plans for liquidity by key executives may signal personal financial planning rather than a change in company outlook.

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 standard practice for executives at publicly traded technology companies to manage personal wealth and tax obligations without triggering market volatility concerns.

Comparison to Industry Standards

• The use of Rule 10b5-1 plans is the industry standard for executive stock divestment in the SaaS and technology sectors.
• The scale of the sale is consistent with typical executive liquidity events for companies of Klaviyo's market capitalization.

Related Party Transactions

• The filing discloses holdings by 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.

Stakeholder Impact

• Minimal impact expected as the sale was pre-planned and disclosed in accordance with SEC regulations.

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, Rule 10b5-1