David Tsao

Companies

• BillionToOne (United States)Board member Nov 5, 2025 to now¹
• BillionToOne (United States)Chief Technology Officer Nov 5, 2025 to now¹

Holdings

Stock this person has reported owning, from the forms officers and directors file with the SEC. See the biggest insider stakes.

Shares held

• BillionToOne (United States) BLLN1,000 shares²$101.6K at $101.59Sep 24, 2026

As of each latest filing. The line shows shares held over time.

Recent filings

• Sep 24, 2026Sold 3,333 shares at $125.00 of BillionToOne (United States)²
• Sep 24, 2026Exercised options 3,333 shares at $2.80 of BillionToOne (United States)²
• Sep 9, 2026Sold 10,000 shares at $100.00 of BillionToOne (United States)³
• Sep 9, 2026Sold 10,000 shares at $97.54 of BillionToOne (United States)³
• Sep 9, 2026Exercised options 10,000 shares at $2.80 of BillionToOne (United States)³
• Sep 9, 2026Exercised options 10,000 shares at $2.80 of BillionToOne (United States)³
• Sep 8, 2026Gift 20,000 shares of BillionToOne (United States)⁴
• Sep 3, 2026Converted 20,000 shares of BillionToOne (United States)⁴
• Aug 25, 2026Sold 10,000 shares at $100.00 of BillionToOne (United States)⁵
• Aug 25, 2026Exercised options 10,000 shares at $2.80 of BillionToOne (United States)⁵
• Aug 10, 2026Sold 10,000 shares at $92.86 of BillionToOne (United States)⁶
• Aug 10, 2026Exercised options 10,000 shares at $2.80 of BillionToOne (United States)⁶
• Jul 13, 2026Sold 1,028 shares at $126.90 of BillionToOne (United States)⁷
• Jul 13, 2026Sold 3,835 shares at $125.76 of BillionToOne (United States)⁷
• Jul 13, 2026Sold 1,725 shares at $124.65 of BillionToOne (United States)⁷
• Jul 13, 2026Sold 2,274 shares at $123.71 of BillionToOne (United States)⁷
• Jul 13, 2026Sold 1,138 shares at $122.84 of BillionToOne (United States)⁷
• Jul 13, 2026Sold 821 shares at $126.89 of BillionToOne (United States)⁷
• Jul 13, 2026Sold 3,185 shares at $125.85 of BillionToOne (United States)⁷
• Jul 13, 2026Sold 2,415 shares at $124.90 of BillionToOne (United States)⁷
• Jul 13, 2026Sold 2,477 shares at $123.84 of BillionToOne (United States)⁷
• Jul 13, 2026Sold 1,102 shares at $122.90 of BillionToOne (United States)⁷
• Jul 13, 2026Exercised options 10,000 shares at $2.80 of BillionToOne (United States)⁷
• Jul 13, 2026Exercised options 10,000 shares at $2.80 of BillionToOne (United States)⁷
• Jun 15, 2026Sold 563 shares at $104.32 of BillionToOne (United States)⁸