BillionToOne: CEO Atay Oguzhan sold 11,000 shares

What happened

• Atay Oguzhan, chairman and chief executive officer, exercised options for 8,333 shares at $2.80 per share (total cost $23,332) and sold 11,000 shares in open-market trades on Oct 14 and Oct 15, 2026, for total proceeds of $1,090,574.
• The filing shows exercised derivative shares were disposed the same day as the exercises.

Key details

• Transaction dates and prices: Oct 14, 2026 and Oct 15, 2026; exercises at $2.80 per share; sales executed at weighted-average prices with reported ranges approximately $98.00 to $102.78 per share across multiple trades.
• Shares owned after the transactions: not stated in the filing.
• Relevant footnotes: trades were effected under a Rule 10b5-1 plan adopted by the reporting person on Jun 5, 2026 (F1) and by the reporting person's spouse on Jun 7, 2026 (F8); options were fully vested and exercisable (F10); several sales report weighted-average prices with per-trade price ranges and the holder will provide breakdowns on written request (F2–F7); some shares are reported as held by the reporting person's spouse (F9).
• Filing date and reporting period: Form 4 filed Oct 16, 2026 for transactions with a period of report of Oct 14, 2026. The filing does not indicate it was late.

Why it may matter

• The filing shows options were exercised and shares were sold on the same dates, indicating the exercised shares were disposed the same day.
• A filing does not show why the insider traded or why the company acted.