BillionToOne Chairman and CEO Oguzhan Atay Reports Disposal of $1.09 Million in Common Shares

• BillionToOne Chairman and CEO Oguzhan Atay sold 8,333 Class A Common Stock shares on Oct. 14-15, 2026.
• Atay exercised options for 8,333 shares at $2.8 per share over the same period.
• His spouse sold 2,667 Class A Common Stock shares at $98 on Oct. 14, leaving 149,168 shares.
• Following the transactions, Atay held no directly owned Class A Common Stock shares; 468,629 stock options remained.

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