BillionToOne Chairman and CEO Oguzhan Atay Reports Disposal of $1.3 Million in Common Shares

• BillionToOne Chairman and CEO Oguzhan Atay sold 8,333 Class A Common Stock shares at $118 each on Oct. 28, 2026.
• Atay exercised options for 8,333 shares at $2.8 each; his direct Class A Common Stock holdings fell to zero following the sale.
• His spouse sold 2,667 Class A Common Stock shares at $118 each, leaving 146,501 shares indirectly held through his spouse.
• Atay retained 460,296 directly held stock options following the transactions.

Disclaimer: This news brief was created by Public Technologies (PUBT) using generative artificial intelligence. While PUBT strives to provide accurate and timely information, this AI-generated content is for informational purposes only and should not be interpreted as financial, investment, or legal advice. Billiontoone Inc. published the original content used to generate this news brief via EDGAR, the Electronic Data Gathering, Analysis, and Retrieval system operated by the U.S. Securities and Exchange Commission (Ref. ID: 0002088549-26-000017), on October 30, 2026, and is solely responsible for the information contained therein.