BillionToOne Chairman and Chief Executive Officer Oguzhan Atay sold his entire directly-held stake in the company, offloading 30,331 Class A Common Stock shares on September 14, 2026 for a total value of roughly $3 million, according to a recent SEC Form 4 filing. The disposition was primarily driven by the cash-less exercise of 24,999 options at a strike price of $2.80, with the resulting shares sold immediately, while the remaining 5,332 shares came from an account held by the reporting person's spouse. The sales were executed at a weighted average price of $99.91, and the transactions followed Rule 10b5-1 trading plans adopted by Atay on June 5, 2026 and by his spouse on June 7, 2026, removing discretionary timing from the execution. Following the sales, Atay holds approximately 157,000 shares indirectly through his spouse and retains 501,962 fully vested stock options, while the company reported second-quarter 2026 revenue of $109.4 million, up 64% year over year, and forecast full-year 2026 revenue of $450 million to $465 million, an increase of 48% to 52% compared to 2025.
BillionToOne, Inc. Class A Common StockCEO sold his entire directly-held stake (~$3M) via a cashless option exercise under a pre-arranged 10b5-1 plan, a routine insider disposition rather than a fundamental signal.
