Bialecki Andrew 4

What Happened
Andrew Bialecki, CEO of Klaviyo (KVYO), converted 206,827 shares of Series B common stock into Series A common stock and sold all 206,827 shares in the open market on March 10, 2026. He sold 206,127 shares for a weighted average price of $19.96 (proceeds $4,114,295) and 700 shares for a weighted average price of $19.34 (proceeds $13,538), for total proceeds of $4,127,833. This was a sale of shares (not a purchase) and was effected under a pre-established Rule 10b5-1 trading plan.

Key Details

• Transaction date: March 10, 2026; Form 4 filed March 12, 2026 (timely filing).
• Sales: 206,127 shares at a weighted average $19.96 (prices ranged $19.375–$20.37) and 700 shares at a weighted average $19.34 (prices ranged $19.28–$19.37). Total proceeds ≈ $4,127,833.
• Conversion: 206,827 shares were converted from Series B to Series A common stock (reported as conversion of a derivative security; $0.00 cash paid for conversion).
• Plan/authorization: Transactions were effected pursuant to a Rule 10b5-1 trading plan adopted May 20, 2025 (footnote).
• Ownership notes: Some shares are held in trusts (footnotes indicate holdings in trusts where Bialecki or family members serve as trustees); the reporting person disclaims Section 16 beneficial ownership of those trust-held shares except to the extent of any pecuniary interest.
• Shares owned after transaction: Not specified in the provided filing excerpt.

Context
This was a routine insider sale executed under a 10b5-1 plan following conversion of convertible Series B shares into voting Series A shares. Conversions of this type involve converting a derivative/convertible share class into common stock (no cash paid) and do not by themselves indicate a view on the company's prospects; the subsequent open-market sale generated the cash proceeds noted above.