BLLN.NASDAQBilliontoone, INC
Form 4: BillionToOne CTO Sells Shares
Sentiment:
Insider Transaction (Form 4)
David Tsao, Chief Technology Officer and a Director of BillionToOne, Inc., sold 20,000 shares of common stock on October 5, 2026.
Summary
- Option exercise/conversion: acquired 10,000 Class A Common Stock at $2.80 ($28,000) on October 5, 2026; holds 11,000 after (Direct).
- Option exercise/conversion: acquired 10,000 Class A Common Stock at $2.80 ($28,000) on October 5, 2026; holds 21,000 after (Direct).
- Open-market sale: disposed of 866 Class A Common Stock at $105.90 ($91,710) on October 5, 2026; holds 20,134 after (Direct).
- Open-market sale: disposed of 1,909 Class A Common Stock at $107.19 ($204,635) on October 5, 2026; holds 18,225 after (Direct).
- Open-market sale: disposed of 4,284 Class A Common Stock at $108.39 ($464,356) on October 5, 2026; holds 13,941 after (Direct).
- Open-market sale: disposed of 2,921 Class A Common Stock at $109.00 ($318,398) on October 5, 2026; holds 11,020 after (Direct).
- Open-market sale: disposed of 20 Class A Common Stock at $110.08 ($2,202) on October 5, 2026; holds 11,000 after (Direct).
- Open-market sale: disposed of 555 Class A Common Stock at $105.56 ($58,585) on October 5, 2026; holds 10,445 after (Direct).
- Open-market sale: disposed of 400 Class A Common Stock at $106.10 ($42,442) on October 5, 2026; holds 10,045 after (Direct).
- Open-market sale: disposed of 2,200 Class A Common Stock at $107.47 ($236,435) on October 5, 2026; holds 7,845 after (Direct).
- Open-market sale: disposed of 4,916 Class A Common Stock at $108.53 ($533,554) on October 5, 2026; holds 2,929 after (Direct).
- Open-market sale: disposed of 1,829 Class A Common Stock at $109.14 ($199,625) on October 5, 2026; holds 1,100 after (Direct).
- Open-market sale: disposed of 100 Class A Common Stock at $110.09 ($11,009) on October 5, 2026; holds 1,000 after (Direct).
- Option exercise/conversion: disposed of 10,000 Stock Option (right to buy) at $2.80 ($28,000) on October 5, 2026; holds 546,667 after (Direct).
- Option exercise/conversion: disposed of 10,000 Stock Option (right to buy) at $2.80 ($28,000) on October 5, 2026; holds 536,667 after (Direct).
Sentiment
Score: 4
Explanation: StockSavvy.ai views this as a mildly negative but low-conviction signal: an insider sold $2,162,950 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 |
|---|---|---|---|---|---|---|
| 2026-10-05 | Option exercise/conversion | Class A Common Stock | 10,000 | $3 | $28.0K | 11,000 |
| 2026-10-05 | Option exercise/conversion | Class A Common Stock | 10,000 | $3 | $28.0K | 21,000 |
| 2026-10-05 | Open-market sale | Class A Common Stock | 866 | $106 | $91.7K | 20,134 |
| 2026-10-05 | Open-market sale | Class A Common Stock | 1,909 | $107 | $204.6K | 18,225 |
| 2026-10-05 | Open-market sale | Class A Common Stock | 4,284 | $108 | $464.4K | 13,941 |
| 2026-10-05 | Open-market sale | Class A Common Stock | 2,921 | $109 | $318.4K | 11,020 |
| 2026-10-05 | Open-market sale | Class A Common Stock | 20 | $110 | $2.2K | 11,000 |
| 2026-10-05 | Open-market sale | Class A Common Stock | 555 | $106 | $58.6K | 10,445 |
| 2026-10-05 | Open-market sale | Class A Common Stock | 400 | $106 | $42.4K | 10,045 |
| 2026-10-05 | Open-market sale | Class A Common Stock | 2,200 | $107 | $236.4K | 7,845 |
| 2026-10-05 | Open-market sale | Class A Common Stock | 4,916 | $109 | $533.6K | 2,929 |
| 2026-10-05 | Open-market sale | Class A Common Stock | 1,829 | $109 | $199.6K | 1,100 |
| 2026-10-05 | Open-market sale | Class A Common Stock | 100 | $110 | $11.0K | 1,000 |
| 2026-10-05 | Option exercise/conversion | Stock Option (right to buy) | 10,000 | $3 | $28.0K | 546,667 |
| 2026-10-05 | Option exercise/conversion | Stock Option (right to buy) | 10,000 | $3 | $28.0K | 536,667 |
Key Dates
| Date | Description |
|---|---|
| 2026-10-05 | Option exercise/conversion (10,000 shares) |
| 2026-10-05 | Option exercise/conversion (10,000 shares) |
| 2026-10-05 | Open-market sale (866 shares) |
| 2026-10-05 | Open-market sale (1,909 shares) |
| 2026-10-05 | Open-market sale (4,284 shares) |
| 2026-10-05 | Open-market sale (2,921 shares) |
| 2026-10-05 | Open-market sale (20 shares) |
| 2026-10-05 | Open-market sale (555 shares) |
| 2026-10-05 | Open-market sale (400 shares) |
| 2026-10-05 | Open-market sale (2,200 shares) |
| 2026-10-05 | Open-market sale (4,916 shares) |
| 2026-10-05 | Open-market sale (1,829 shares) |
| 2026-10-05 | Open-market sale (100 shares) |
| 2026-10-05 | Option exercise/conversion (10,000 shares) |
| 2026-10-05 | Option exercise/conversion (10,000 shares) |
Keywords
insider transaction, Form 4, BLLN, BillionToOne, Inc., bearish, David Tsao
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