BillionToOne: chairman and CEO Atay Oguzhan sold 19,334 shares

What happened

• Atay Oguzhan, chairman and CEO, exercised or converted options twice for 16,667 shares each at $2.80 per share (acquired 33,334 shares for $93,336 total). The filing also reports a derivative disposition of 16,667 shares at $2.80 for $46,668.
• The filing shows open-market sales totaling 19,334 shares on Oct 12, 2026 for aggregate proceeds of $1,823,450. Individual weighted-average prices reported: $91.57, $93.05, $93.65, $94.61, $96.39 and $97.61.

Key details

• Transaction date: Oct 12, 2026. Filing date: Oct 14, 2026.
• Option exercise price(s): $2.80 per share. Sale price ranges (per footnotes): $91.25–$92.17; $92.2596–$93.255; $93.260–$94.225; $94.265–$95.205; $95.945–$96.765. Reported sale weighted averages shown above.
• Shares owned after the transactions: not stated in the provided filing excerpt.
• Relevant footnotes: F1 — transactions effected under a Rule 10b5-1 plan adopted by the reporting person on Jun 5, 2026; F7 — a plan adopted by the reporting person's spouse on Jun 7, 2026; F8 — some shares are held by the reporting person's spouse; F9 — the options were fully vested and exercisable; F2–F6 — reported sale prices are weighted averages with specified price ranges and the holder will provide breakdown upon written request.
• Filing timeliness: the filing does not indicate it was late.

Why it may matter

• The filing shows option exercises and separate open-market sales on the same date; the filing does not specify whether this was a cashless exercise or a separate sale strategy.
• The filing does not identify any 10% owner status for the reporting person in the provided excerpt.
• A filing does not show why the insider traded or why the company acted.