BillionToOne CEO Sells Entire Direct Stake via Rule 10b5-1 Plan
On September 14, 2026, BillionToOne's CEO Oguzhan Atay sold all of his directly held shares in the company for approximately $3 million. The transaction included a cashless exercise and immediate sale of 24,999 stock options at a strike price of $2.80, as well as an additional 5,332 shares from an account owned by Atay's spouse. The sales were executed under Rule 10b5-1 trading plans established in June 2026 and occurred at a weighted average sale price of $99.91 per share. The stock closed higher on the day of the transaction ($100.82) and continued to rise, reaching $103.61 by September 16. Despite concerns that such large insider sales might signal negative sentiment toward the company's prospects, this move was non-discretionary due to its pre-planned nature under SEC rules. Atay still holds a significant number of fully vested stock options and his spouse retains over 157,000 shares.
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