SEC Filing Summary

David Tsao, Chief Technology Officer and Director at BillionToOne, Inc., reported transactions on September 3, 2026, and September 8, 2026. On September 3, Tsao acquired 20,000 shares of Class A Common Stock and disposed of 20,000 shares of Class B Common Stock, which converted to 20,000 shares of Class A Common Stock. Following these transactions, Tsao held 21,000 shares of Class A Common Stock. On September 8, Tsao disposed of an additional 20,000 shares of Class A Common Stock, leaving him with 1,000 shares. The Class B common stock is convertible into Class A common stock on a one-for-one basis under certain conditions, including a seven-year period or a vote by Class B shareholders. The conversion of Class B to Class A shares occurred at the option of the holder and was done at a 1:1 ratio.