Form 4: BillionToOne CEO Sells Shares
Insider Transaction (Form 4)
Oguzhan Atay, Chairman and CEO and a Director of BillionToOne, Inc., sold 30,331 shares of common stock on September 14, 2026.
Summary
- Option exercise/conversion: acquired 16,666 Class A Common Stock at $2.80 ($46,665) on September 14, 2026; holds 16,666 after (Direct).
- Option exercise/conversion: acquired 8,333 Class A Common Stock at $2.80 ($23,332) on September 14, 2026; holds 24,999 after (Direct).
- Open-market sale: disposed of 4,465 Class A Common Stock at $98.63 ($440,389) on September 14, 2026; holds 20,534 after (Direct).
- Open-market sale: disposed of 2,456 Class A Common Stock at $99.57 ($244,547) on September 14, 2026; holds 18,078 after (Direct).
- Open-market sale: disposed of 2,531 Class A Common Stock at $100.58 ($254,570) on September 14, 2026; holds 15,547 after (Direct).
- Open-market sale: disposed of 7,214 Class A Common Stock at $101.44 ($731,793) on September 14, 2026; holds 8,333 after (Direct).
- Open-market sale: disposed of 1,680 Class A Common Stock at $98.64 ($165,708) on September 14, 2026; holds 6,653 after (Direct).
- Open-market sale: disposed of 1,500 Class A Common Stock at $99.57 ($149,352) on September 14, 2026; holds 5,153 after (Direct).
- Open-market sale: disposed of 2,010 Class A Common Stock at $100.78 ($202,559) on September 14, 2026; holds 3,143 after (Direct).
- Open-market sale: disposed of 3,143 Class A Common Stock at $101.49 ($318,989) on September 14, 2026 (Direct).
- Open-market sale: disposed of 2,666 Class A Common Stock at $98.00 ($261,268) on September 14, 2026; holds 159,834 after (Indirect).
- Open-market sale: disposed of 2,666 Class A Common Stock at $98.00 ($261,268) on September 14, 2026; holds 157,168 after (Indirect).
- Option exercise/conversion: disposed of 16,666 Stock Option (right to buy) at $2.80 ($46,665) on September 14, 2026; holds 510,295 after (Direct).
- Option exercise/conversion: disposed of 8,333 Stock Option (right to buy) at $2.80 ($23,332) on September 14, 2026; holds 501,962 after (Direct).
Sentiment
Score: 4
Explanation: StockSavvy.ai views this as a mildly negative but low-conviction signal: an insider sold $3,030,444 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 |
|---|---|---|---|---|---|---|
| 2026-09-14 | Option exercise/conversion | Class A Common Stock | 16,666 | $3 | $46.7K | 16,666 |
| 2026-09-14 | Option exercise/conversion | Class A Common Stock | 8,333 | $3 | $23.3K | 24,999 |
| 2026-09-14 | Open-market sale | Class A Common Stock | 4,465 | $99 | $440.4K | 20,534 |
| 2026-09-14 | Open-market sale | Class A Common Stock | 2,456 | $100 | $244.5K | 18,078 |
| 2026-09-14 | Open-market sale | Class A Common Stock | 2,531 | $101 | $254.6K | 15,547 |
| 2026-09-14 | Open-market sale | Class A Common Stock | 7,214 | $101 | $731.8K | 8,333 |
| 2026-09-14 | Open-market sale | Class A Common Stock | 1,680 | $99 | $165.7K | 6,653 |
| 2026-09-14 | Open-market sale | Class A Common Stock | 1,500 | $100 | $149.4K | 5,153 |
| 2026-09-14 | Open-market sale | Class A Common Stock | 2,010 | $101 | $202.6K | 3,143 |
| 2026-09-14 | Open-market sale | Class A Common Stock | 3,143 | $101 | $319.0K | 0 |
| 2026-09-14 | Open-market sale | Class A Common Stock | 2,666 | $98 | $261.3K | 159,834 |
| 2026-09-14 | Open-market sale | Class A Common Stock | 2,666 | $98 | $261.3K | 157,168 |
| 2026-09-14 | Option exercise/conversion | Stock Option (right to buy) | 16,666 | $3 | $46.7K | 510,295 |
| 2026-09-14 | Option exercise/conversion | Stock Option (right to buy) | 8,333 | $3 | $23.3K | 501,962 |
Key Dates
| Date | Description |
|---|---|
| 2026-09-14 | Option exercise/conversion (16,666 shares) |
| 2026-09-14 | Option exercise/conversion (8,333 shares) |
| 2026-09-14 | Open-market sale (4,465 shares) |
| 2026-09-14 | Open-market sale (2,456 shares) |
| 2026-09-14 | Open-market sale (2,531 shares) |
| 2026-09-14 | Open-market sale (7,214 shares) |
| 2026-09-14 | Open-market sale (1,680 shares) |
| 2026-09-14 | Open-market sale (1,500 shares) |
| 2026-09-14 | Open-market sale (2,010 shares) |
| 2026-09-14 | Open-market sale (3,143 shares) |
| 2026-09-14 | Open-market sale (2,666 shares) |
| 2026-09-14 | Open-market sale (2,666 shares) |
| 2026-09-14 | Option exercise/conversion (16,666 shares) |
| 2026-09-14 | Option exercise/conversion (8,333 shares) |
Keywords
insider transaction, Form 4, BLLN, BillionToOne, Inc., bearish, Oguzhan Atay
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