Form 4: BillionToOne CTO Sells Shares
Insider Transaction (Form 4)
David Tsao, Chief Technology Officer and a Director of BillionToOne, Inc., sold 3,333 shares of common stock on September 24, 2026 for $125.00 per share.
Summary
- Option exercise/conversion: acquired 3,333 Class A Common Stock at $2.80 ($9,332) on September 24, 2026; holds 4,333 after (Direct).
- Open-market sale: disposed of 3,333 Class A Common Stock at $125.00 ($416,625) on September 24, 2026; holds 1,000 after (Direct).
- Option exercise/conversion: disposed of 3,333 Stock Option (right to buy) at $2.80 ($9,332) on September 24, 2026; holds 556,667 after (Direct).
Sentiment
Score: 4
Explanation: StockSavvy.ai views this as a mildly negative but low-conviction signal: an insider sold $416,625 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 |
|---|---|---|---|---|---|---|
| 2026-09-24 | Option exercise/conversion | Class A Common Stock | 3,333 | $3 | $9.3K | 4,333 |
| 2026-09-24 | Open-market sale | Class A Common Stock | 3,333 | $125 | $416.6K | 1,000 |
| 2026-09-24 | Option exercise/conversion | Stock Option (right to buy) | 3,333 | $3 | $9.3K | 556,667 |
Key Dates
| Date | Description |
|---|---|
| 2026-09-24 | Option exercise/conversion (3,333 shares) |
| 2026-09-24 | Open-market sale (3,333 shares) |
| 2026-09-24 | Option exercise/conversion (3,333 shares) |
Keywords
insider transaction, Form 4, BLLN, BillionToOne, Inc., bearish, David Tsao
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