Form 4: BillionToOne CEO Sells Shares
Insider Transaction (Form 4)
Oguzhan Atay, Chairman and CEO and a Director of BillionToOne, Inc., sold 11,000 shares of common stock on October 14, 2026.
Summary
- Option exercise/conversion: acquired 3,183 Class A Common Stock at $2.80 ($8,912) on October 14, 2026; holds 3,183 after (Direct).
- Open-market sale: disposed of 3,083 Class A Common Stock at $98.32 ($303,120) on October 14, 2026; holds 100 after (Direct).
- Open-market sale: disposed of 100 Class A Common Stock at $99.00 ($9,900) on October 14, 2026 (Direct).
- Option exercise/conversion: acquired 5,150 Class A Common Stock at $2.80 ($14,420) on October 15, 2026; holds 5,150 after (Direct).
- Open-market sale: disposed of 900 Class A Common Stock at $98.43 ($88,590) on October 15, 2026; holds 4,250 after (Direct).
- Open-market sale: disposed of 1,861 Class A Common Stock at $99.84 ($185,809) on October 15, 2026; holds 2,389 after (Direct).
- Open-market sale: disposed of 1,276 Class A Common Stock at $100.60 ($128,369) on October 15, 2026; holds 1,113 after (Direct).
- Open-market sale: disposed of 980 Class A Common Stock at $101.79 ($99,751) on October 15, 2026; holds 133 after (Direct).
- Open-market sale: disposed of 133 Class A Common Stock at $102.78 ($13,669) on October 15, 2026 (Direct).
- Open-market sale: disposed of 2,667 Class A Common Stock at $98.00 ($261,366) on October 14, 2026; holds 149,168 after (Indirect).
- Option exercise/conversion: disposed of 3,183 Stock Option (right to buy) at $2.80 ($8,912) on October 14, 2026; holds 473,779 after (Direct).
- Option exercise/conversion: disposed of 5,150 Stock Option (right to buy) at $2.80 ($14,420) on October 15, 2026; holds 468,629 after (Direct).
Sentiment
Score: 4
Explanation: StockSavvy.ai views this as a mildly negative but low-conviction signal: an insider sold $1,090,575 of stock under a pre-arranged Rule 10b5-1 plan, which is typically routine.
Insider Transactions
Oguzhan Atay — Director, Officer (Chairman and CEO)
Transaction made under a Rule 10b5-1 trading plan.
| Date | Transaction | Security | Shares | Price | Value | Held After |
|---|---|---|---|---|---|---|
| 2026-10-14 | Option exercise/conversion | Class A Common Stock | 3,183 | $3 | $8.9K | 3,183 |
| 2026-10-14 | Open-market sale | Class A Common Stock | 3,083 | $98 | $303.1K | 100 |
| 2026-10-14 | Open-market sale | Class A Common Stock | 100 | $99 | $9.9K | 0 |
| 2026-10-15 | Option exercise/conversion | Class A Common Stock | 5,150 | $3 | $14.4K | 5,150 |
| 2026-10-15 | Open-market sale | Class A Common Stock | 900 | $98 | $88.6K | 4,250 |
| 2026-10-15 | Open-market sale | Class A Common Stock | 1,861 | $100 | $185.8K | 2,389 |
| 2026-10-15 | Open-market sale | Class A Common Stock | 1,276 | $101 | $128.4K | 1,113 |
| 2026-10-15 | Open-market sale | Class A Common Stock | 980 | $102 | $99.8K | 133 |
| 2026-10-15 | Open-market sale | Class A Common Stock | 133 | $103 | $13.7K | 0 |
| 2026-10-14 | Open-market sale | Class A Common Stock | 2,667 | $98 | $261.4K | 149,168 |
| 2026-10-14 | Option exercise/conversion | Stock Option (right to buy) | 3,183 | $3 | $8.9K | 473,779 |
| 2026-10-15 | Option exercise/conversion | Stock Option (right to buy) | 5,150 | $3 | $14.4K | 468,629 |
Key Dates
| Date | Description |
|---|---|
| 2026-10-14 | Option exercise/conversion (3,183 shares) |
| 2026-10-14 | Open-market sale (3,083 shares) |
| 2026-10-14 | Open-market sale (100 shares) |
| 2026-10-15 | Option exercise/conversion (5,150 shares) |
| 2026-10-15 | Open-market sale (900 shares) |
| 2026-10-15 | Open-market sale (1,861 shares) |
| 2026-10-15 | Open-market sale (1,276 shares) |
| 2026-10-15 | Open-market sale (980 shares) |
| 2026-10-15 | Open-market sale (133 shares) |
| 2026-10-14 | Open-market sale (2,667 shares) |
| 2026-10-14 | Option exercise/conversion (3,183 shares) |
| 2026-10-15 | Option exercise/conversion (5,150 shares) |
Keywords
insider transaction, Form 4, BLLN, BillionToOne, Inc., bearish, Oguzhan Atay
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