Form 4: BillionToOne CTO Sells Shares
Insider Transaction (Form 4)
David Tsao, Chief Technology Officer and a Director of BillionToOne, Inc., sold 20,000 shares of common stock on September 9, 2026.
Summary
- Option exercise/conversion: acquired 10,000 Class A Common Stock at $2.80 ($28,000) on September 9, 2026; holds 11,000 after (Direct).
- Option exercise/conversion: acquired 10,000 Class A Common Stock at $2.80 ($28,000) on September 9, 2026; holds 21,000 after (Direct).
- Open-market sale: disposed of 10,000 Class A Common Stock at $97.54 ($975,400) on September 9, 2026; holds 11,000 after (Direct).
- Open-market sale: disposed of 10,000 Class A Common Stock at $100.00 ($1,000,000) on September 9, 2026; holds 1,000 after (Direct).
- Option exercise/conversion: disposed of 10,000 Stock Option (right to buy) at $2.80 ($28,000) on September 9, 2026; holds 570,000 after (Direct).
- Option exercise/conversion: disposed of 10,000 Stock Option (right to buy) at $2.80 ($28,000) on September 9, 2026; holds 560,000 after (Direct).
Sentiment
Score: 4
Explanation: StockSavvy.ai views this as a mildly negative but low-conviction signal: an insider sold $1,975,400 of stock under a pre-arranged Rule 10b5-1 plan, which is typically routine.
Insider Transactions
David Tsao — Director, Officer (Chief Technology Officer)
Transaction made under a Rule 10b5-1 trading plan.
| Date | Transaction | Security | Shares | Price | Value | Held After |
|---|---|---|---|---|---|---|
| 2026-09-09 | Option exercise/conversion | Class A Common Stock | 10,000 | $3 | $28.0K | 11,000 |
| 2026-09-09 | Option exercise/conversion | Class A Common Stock | 10,000 | $3 | $28.0K | 21,000 |
| 2026-09-09 | Open-market sale | Class A Common Stock | 10,000 | $98 | $975.4K | 11,000 |
| 2026-09-09 | Open-market sale | Class A Common Stock | 10,000 | $100 | $1.0M | 1,000 |
| 2026-09-09 | Option exercise/conversion | Stock Option (right to buy) | 10,000 | $3 | $28.0K | 570,000 |
| 2026-09-09 | Option exercise/conversion | Stock Option (right to buy) | 10,000 | $3 | $28.0K | 560,000 |
Key Dates
| Date | Description |
|---|---|
| 2026-09-09 | Option exercise/conversion (10,000 shares) |
| 2026-09-09 | Option exercise/conversion (10,000 shares) |
| 2026-09-09 | Open-market sale (10,000 shares) |
| 2026-09-09 | Open-market sale (10,000 shares) |
| 2026-09-09 | Option exercise/conversion (10,000 shares) |
| 2026-09-09 | Option exercise/conversion (10,000 shares) |
Keywords
insider transaction, Form 4, BLLN, BillionToOne, Inc., bearish, David Tsao
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