Form 4: BillionToOne CEO Sells Shares
Insider Transaction (Form 4)
Oguzhan Atay, Chairman and CEO and a Director of BillionToOne, Inc., sold 19,334 shares of common stock on October 12, 2026.
Summary
- Option exercise/conversion: acquired 16,667 Class A Common Stock at $2.80 ($46,668) on October 12, 2026; holds 16,667 after (Direct).
- Open-market sale: disposed of 1,961 Class A Common Stock at $91.57 ($179,571) on October 12, 2026; holds 14,706 after (Direct).
- Open-market sale: disposed of 2,553 Class A Common Stock at $93.05 ($237,546) on October 12, 2026; holds 12,153 after (Direct).
- Open-market sale: disposed of 6,763 Class A Common Stock at $93.65 ($633,335) on October 12, 2026; holds 5,390 after (Direct).
- Open-market sale: disposed of 3,869 Class A Common Stock at $94.61 ($366,059) on October 12, 2026; holds 1,521 after (Direct).
- Open-market sale: disposed of 1,521 Class A Common Stock at $96.39 ($146,613) on October 12, 2026 (Direct).
- Open-market sale: disposed of 2,667 Class A Common Stock at $97.61 ($260,326) on October 12, 2026; holds 151,835 after (Indirect).
- Option exercise/conversion: disposed of 16,667 Stock Option (right to buy) at $2.80 ($46,668) on October 12, 2026; holds 476,962 after (Direct).
Sentiment
Score: 4
Explanation: StockSavvy.ai views this as a mildly negative but low-conviction signal: an insider sold $1,823,450 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 |
|---|---|---|---|---|---|---|
| 2026-10-12 | Option exercise/conversion | Class A Common Stock | 16,667 | $3 | $46.7K | 16,667 |
| 2026-10-12 | Open-market sale | Class A Common Stock | 1,961 | $92 | $179.6K | 14,706 |
| 2026-10-12 | Open-market sale | Class A Common Stock | 2,553 | $93 | $237.5K | 12,153 |
| 2026-10-12 | Open-market sale | Class A Common Stock | 6,763 | $94 | $633.3K | 5,390 |
| 2026-10-12 | Open-market sale | Class A Common Stock | 3,869 | $95 | $366.1K | 1,521 |
| 2026-10-12 | Open-market sale | Class A Common Stock | 1,521 | $96 | $146.6K | 0 |
| 2026-10-12 | Open-market sale | Class A Common Stock | 2,667 | $98 | $260.3K | 151,835 |
| 2026-10-12 | Option exercise/conversion | Stock Option (right to buy) | 16,667 | $3 | $46.7K | 476,962 |
Key Dates
| Date | Description |
|---|---|
| 2026-10-12 | Option exercise/conversion (16,667 shares) |
| 2026-10-12 | Open-market sale (1,961 shares) |
| 2026-10-12 | Open-market sale (2,553 shares) |
| 2026-10-12 | Open-market sale (6,763 shares) |
| 2026-10-12 | Open-market sale (3,869 shares) |
| 2026-10-12 | Open-market sale (1,521 shares) |
| 2026-10-12 | Open-market sale (2,667 shares) |
| 2026-10-12 | Option exercise/conversion (16,667 shares) |
Keywords
insider transaction, Form 4, BLLN, BillionToOne, Inc., bearish, Oguzhan Atay
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