BillionToOne, Inc. (BLLN) — insider trading
Health Care · NASDAQ
BillionToOne, Inc. (BLLN) has 346 reported SEC Form 4 insider transactions in our data, including 60 open-market sales among the most recent 100 (latest 2026-10-15).
Recent Form 4 transactions
Showing the 100 most recent of 346 recorded transactions. See all on SEC EDGAR →
| Date | Insider | Role | Type | Shares | Price | Value | Filing |
|---|---|---|---|---|---|---|---|
| 2026-10-15 | Atay Oguzhan | Director, Officer (Chairman and CEO) | Option exercise / conversion (derivative) | 5,150 | $2.80 | $14.4K | Form 4 |
| 2026-10-15 | Atay Oguzhan | Director, Officer (Chairman and CEO) | Open-market sale | 133 | $102.78 | $13.7K | Form 4 |
| 2026-10-15 | Atay Oguzhan | Director, Officer (Chairman and CEO) | Open-market sale | 980 | $101.79 | $99.8K | Form 4 |
| 2026-10-15 | Atay Oguzhan | Director, Officer (Chairman and CEO) | Open-market sale | 1,276 | $100.60 | $128.4K | Form 4 |
| 2026-10-15 | Atay Oguzhan | Director, Officer (Chairman and CEO) | Open-market sale | 1,861 | $99.84 | $185.8K | Form 4 |
| 2026-10-15 | Atay Oguzhan | Director, Officer (Chairman and CEO) | Open-market sale | 900 | $98.43 | $88.6K | Form 4 |
| 2026-10-15 | Atay Oguzhan | Director, Officer (Chairman and CEO) | Option exercise / conversion | 5,150 | $2.80 | $14.4K | Form 4 |
| 2026-10-14 | Atay Oguzhan | Director, Officer (Chairman and CEO) | Option exercise / conversion (derivative) | 3,183 | $2.80 | $8.9K | Form 4 |
| 2026-10-14 | Atay Oguzhan | Director, Officer (Chairman and CEO) | Open-market sale | 2,667 | $98.00 | $261.4K | Form 4 |
| 2026-10-14 | Atay Oguzhan | Director, Officer (Chairman and CEO) | Open-market sale | 100 | $99.00 | $9.9K | Form 4 |
| 2026-10-14 | Atay Oguzhan | Director, Officer (Chairman and CEO) | Open-market sale | 3,083 | $98.32 | $303.1K | Form 4 |
| 2026-10-14 | Atay Oguzhan | Director, Officer (Chairman and CEO) | Option exercise / conversion | 3,183 | $2.80 | $8.9K | Form 4 |
| 2026-10-13 | Lynch Thomas P. | Officer (See Remarks) | Option exercise / conversion (derivative) | 2,000 | $8.65 | $17.3K | Form 4 |
| 2026-10-13 | Lynch Thomas P. | Officer (See Remarks) | Option exercise / conversion | 2,000 | $8.65 | $17.3K | Form 4 |
| 2026-10-12 | Atay Oguzhan | Director, Officer (Chairman and CEO) | Option exercise / conversion (derivative) | 16,667 | $2.80 | $46.7K | Form 4 |
| 2026-10-12 | Atay Oguzhan | Director, Officer (Chairman and CEO) | Open-market sale | 2,667 | $97.61 | $260.3K | Form 4 |
| 2026-10-12 | Atay Oguzhan | Director, Officer (Chairman and CEO) | Open-market sale | 1,521 | $96.39 | $146.6K | Form 4 |
| 2026-10-12 | Atay Oguzhan | Director, Officer (Chairman and CEO) | Open-market sale | 3,869 | $94.61 | $366.1K | Form 4 |
| 2026-10-12 | Atay Oguzhan | Director, Officer (Chairman and CEO) | Open-market sale | 6,763 | $93.65 | $633.3K | Form 4 |
| 2026-10-12 | Atay Oguzhan | Director, Officer (Chairman and CEO) | Open-market sale | 2,553 | $93.05 | $237.5K | Form 4 |
| 2026-10-12 | Atay Oguzhan | Director, Officer (Chairman and CEO) | Open-market sale | 1,961 | $91.57 | $179.6K | Form 4 |
| 2026-10-12 | Atay Oguzhan | Director, Officer (Chairman and CEO) | Option exercise / conversion | 16,667 | $2.80 | $46.7K | Form 4 |
| 2026-10-08 | Lynch Thomas P. | Officer (See Remarks) | Option exercise / conversion (derivative) | 8,000 | $8.65 | $69.2K | Form 4 |
| 2026-10-08 | Lynch Thomas P. | Officer (See Remarks) | Option exercise / conversion | 8,000 | $8.65 | $69.2K | Form 4 |
| 2026-10-05 | Tsao David | Director, Officer (Chief Technology Officer) | Option exercise / conversion (derivative) | 10,000 | $2.80 | $28.0K | Form 4 |
| 2026-10-05 | Tsao David | Director, Officer (Chief Technology Officer) | Option exercise / conversion (derivative) | 10,000 | $2.80 | $28.0K | Form 4 |
| 2026-10-05 | Tsao David | Director, Officer (Chief Technology Officer) | Open-market sale | 100 | $110.09 | $11.0K | Form 4 |
| 2026-10-05 | Tsao David | Director, Officer (Chief Technology Officer) | Open-market sale | 1,829 | $109.14 | $199.6K | Form 4 |
| 2026-10-05 | Tsao David | Director, Officer (Chief Technology Officer) | Open-market sale | 4,916 | $108.53 | $533.6K | Form 4 |
| 2026-10-05 | Tsao David | Director, Officer (Chief Technology Officer) | Open-market sale | 2,200 | $107.47 | $236.4K | Form 4 |
| 2026-10-05 | Tsao David | Director, Officer (Chief Technology Officer) | Open-market sale | 400 | $106.10 | $42.4K | Form 4 |
| 2026-10-05 | Tsao David | Director, Officer (Chief Technology Officer) | Open-market sale | 555 | $105.56 | $58.6K | Form 4 |
| 2026-10-05 | Tsao David | Director, Officer (Chief Technology Officer) | Open-market sale | 20 | $110.08 | $2.2K | Form 4 |
| 2026-10-05 | Tsao David | Director, Officer (Chief Technology Officer) | Open-market sale | 2,921 | $109.00 | $318.4K | Form 4 |
| 2026-10-05 | Tsao David | Director, Officer (Chief Technology Officer) | Open-market sale | 4,284 | $108.39 | $464.4K | Form 4 |
| 2026-10-05 | Tsao David | Director, Officer (Chief Technology Officer) | Open-market sale | 1,909 | $107.20 | $204.6K | Form 4 |
| 2026-10-05 | Tsao David | Director, Officer (Chief Technology Officer) | Open-market sale | 866 | $105.90 | $91.7K | Form 4 |
| 2026-10-05 | Tsao David | Director, Officer (Chief Technology Officer) | Option exercise / conversion | 10,000 | $2.80 | $28.0K | Form 4 |
| 2026-10-05 | Tsao David | Director, Officer (Chief Technology Officer) | Option exercise / conversion | 10,000 | $2.80 | $28.0K | Form 4 |
| 2026-10-05 | ten Bosch John Roderick | Officer (SVP of Laboratory Operations) | Open-market sale | 1,417 | $105.15 | $149.0K | Form 4 |
| 2026-10-05 | ten Bosch John Roderick | Officer (SVP of Laboratory Operations) | Open-market sale | 1,417 | $105.15 | $149.0K | Form 4 |
| 2026-09-28 | Atay Oguzhan | Director, Officer (Chairman and CEO) | Option exercise / conversion (derivative) | 8,333 | $2.80 | $23.3K | Form 4 |
| 2026-09-28 | Atay Oguzhan | Director, Officer (Chairman and CEO) | Open-market sale | 2,666 | $120.64 | $321.6K | Form 4 |
| 2026-09-28 | Atay Oguzhan | Director, Officer (Chairman and CEO) | Open-market sale | 8,333 | $120.64 | $1.01M | Form 4 |
| 2026-09-28 | Atay Oguzhan | Director, Officer (Chairman and CEO) | Option exercise / conversion | 8,333 | $2.80 | $23.3K | Form 4 |
| 2026-09-24 | Tsao David | Director, Officer (Chief Technology Officer) | Option exercise / conversion (derivative) | 3,333 | $2.80 | $9.3K | Form 4 |
| 2026-09-24 | Tsao David | Director, Officer (Chief Technology Officer) | Open-market sale | 3,333 | $125.00 | $416.6K | Form 4 |
| 2026-09-24 | Tsao David | Director, Officer (Chief Technology Officer) | Option exercise / conversion | 3,333 | $2.80 | $9.3K | Form 4 |
| 2026-09-24 | ten Bosch John Roderick | Officer (SVP of Laboratory Operations) | Open-market sale | 1,416 | $120.00 | $169.9K | Form 4 |
| 2026-09-21 | ten Bosch John Roderick | Officer (SVP of Laboratory Operations) | Open-market sale | 1,416 | $106.61 | $151.0K | Form 4 |
| 2026-09-17 | Lynch Thomas P. | Officer (See Remarks) | Option exercise / conversion (derivative) | 5,840 | $30.78 | $179.8K | Form 4 |
| 2026-09-17 | Lynch Thomas P. | Officer (See Remarks) | Option exercise / conversion (derivative) | 2,920 | $17.12 | $50.0K | Form 4 |
| 2026-09-17 | Lynch Thomas P. | Officer (See Remarks) | Option exercise / conversion (derivative) | 6,968 | $11.55 | $80.5K | Form 4 |
| 2026-09-17 | Lynch Thomas P. | Officer (See Remarks) | Option exercise / conversion (derivative) | 19,384 | $8.65 | $167.7K | Form 4 |
| 2026-09-17 | Lynch Thomas P. | Officer (See Remarks) | Open-market sale | 5,840 | $110.29 | $644.1K | Form 4 |
| 2026-09-17 | Lynch Thomas P. | Officer (See Remarks) | Open-market sale | 2,920 | $110.31 | $322.1K | Form 4 |
| 2026-09-17 | Lynch Thomas P. | Officer (See Remarks) | Open-market sale | 6,968 | $110.30 | $768.6K | Form 4 |
| 2026-09-17 | Lynch Thomas P. | Officer (See Remarks) | Open-market sale | 19,384 | $110.36 | $2.14M | Form 4 |
| 2026-09-17 | Lynch Thomas P. | Officer (See Remarks) | Option exercise / conversion | 5,840 | $30.78 | $179.8K | Form 4 |
| 2026-09-17 | Lynch Thomas P. | Officer (See Remarks) | Option exercise / conversion | 2,920 | $17.12 | $50.0K | Form 4 |
| 2026-09-17 | Lynch Thomas P. | Officer (See Remarks) | Option exercise / conversion | 6,968 | $11.55 | $80.5K | Form 4 |
| 2026-09-17 | Lynch Thomas P. | Officer (See Remarks) | Option exercise / conversion | 19,384 | $8.65 | $167.7K | Form 4 |
| 2026-09-14 | Atay Oguzhan | Director, Officer (Chairman and CEO) | Option exercise / conversion (derivative) | 8,333 | $2.80 | $23.3K | Form 4 |
| 2026-09-14 | Atay Oguzhan | Director, Officer (Chairman and CEO) | Option exercise / conversion (derivative) | 16,666 | $2.80 | $46.7K | Form 4 |
| 2026-09-14 | Atay Oguzhan | Director, Officer (Chairman and CEO) | Open-market sale | 2,666 | $98.00 | $261.3K | Form 4 |
| 2026-09-14 | Atay Oguzhan | Director, Officer (Chairman and CEO) | Open-market sale | 2,666 | $98.00 | $261.3K | Form 4 |
| 2026-09-14 | Atay Oguzhan | Director, Officer (Chairman and CEO) | Open-market sale | 3,143 | $101.49 | $319.0K | Form 4 |
| 2026-09-14 | Atay Oguzhan | Director, Officer (Chairman and CEO) | Open-market sale | 2,010 | $100.78 | $202.6K | Form 4 |
| 2026-09-14 | Atay Oguzhan | Director, Officer (Chairman and CEO) | Open-market sale | 1,500 | $99.57 | $149.4K | Form 4 |
| 2026-09-14 | Atay Oguzhan | Director, Officer (Chairman and CEO) | Open-market sale | 1,680 | $98.64 | $165.7K | Form 4 |
| 2026-09-14 | Atay Oguzhan | Director, Officer (Chairman and CEO) | Open-market sale | 7,214 | $101.44 | $731.8K | Form 4 |
| 2026-09-14 | Atay Oguzhan | Director, Officer (Chairman and CEO) | Open-market sale | 2,531 | $100.58 | $254.6K | Form 4 |
| 2026-09-14 | Atay Oguzhan | Director, Officer (Chairman and CEO) | Open-market sale | 2,456 | $99.57 | $244.5K | Form 4 |
| 2026-09-14 | Atay Oguzhan | Director, Officer (Chairman and CEO) | Open-market sale | 4,465 | $98.63 | $440.4K | Form 4 |
| 2026-09-14 | Atay Oguzhan | Director, Officer (Chairman and CEO) | Option exercise / conversion | 8,333 | $2.80 | $23.3K | Form 4 |
| 2026-09-14 | Atay Oguzhan | Director, Officer (Chairman and CEO) | Option exercise / conversion | 16,666 | $2.80 | $46.7K | Form 4 |
| 2026-09-10 | Sakakibara Shan Riku | Officer (Chief Product Officer) | Bona fide gift | 3,500 | — | $0 | Form 4 |
| 2026-09-09 | Tsao David | Director, Officer (Chief Technology Officer) | Option exercise / conversion (derivative) | 10,000 | $2.80 | $28.0K | Form 4 |
| 2026-09-09 | Tsao David | Director, Officer (Chief Technology Officer) | Option exercise / conversion (derivative) | 10,000 | $2.80 | $28.0K | Form 4 |
| 2026-09-09 | Tsao David | Director, Officer (Chief Technology Officer) | Open-market sale | 10,000 | $100.00 | $1.00M | Form 4 |
| 2026-09-09 | Tsao David | Director, Officer (Chief Technology Officer) | Open-market sale | 10,000 | $97.54 | $975.4K | Form 4 |
| 2026-09-09 | Tsao David | Director, Officer (Chief Technology Officer) | Option exercise / conversion | 10,000 | $2.80 | $28.0K | Form 4 |
| 2026-09-09 | Tsao David | Director, Officer (Chief Technology Officer) | Option exercise / conversion | 10,000 | $2.80 | $28.0K | Form 4 |
| 2026-09-09 | ten Bosch John Roderick | Officer (SVP of Laboratory Operations) | Open-market sale | 1,416 | $97.54 | $138.1K | Form 4 |
| 2026-09-09 | Atay Oguzhan | Director, Officer (Chairman and CEO) | Bona fide gift | 20,000 | — | $0 | Form 4 |
| 2026-09-08 | Lynch Thomas P. | Officer (See Remarks) | Option exercise / conversion (derivative) | 3,326 | $30.78 | $102.4K | Form 4 |
| 2026-09-08 | Lynch Thomas P. | Officer (See Remarks) | Option exercise / conversion (derivative) | 1,663 | $17.12 | $28.5K | Form 4 |
| 2026-09-08 | Lynch Thomas P. | Officer (See Remarks) | Option exercise / conversion (derivative) | 3,969 | $11.55 | $45.8K | Form 4 |
| 2026-09-08 | Lynch Thomas P. | Officer (See Remarks) | Option exercise / conversion (derivative) | 11,042 | $8.65 | $95.5K | Form 4 |
| 2026-09-08 | Lynch Thomas P. | Officer (See Remarks) | Open-market sale | 232 | $100.92 | $23.4K | Form 4 |
| 2026-09-08 | Lynch Thomas P. | Officer (See Remarks) | Open-market sale | 2,518 | $100.20 | $252.3K | Form 4 |
| 2026-09-08 | Lynch Thomas P. | Officer (See Remarks) | Open-market sale | 576 | $98.89 | $57.0K | Form 4 |
| 2026-09-08 | Lynch Thomas P. | Officer (See Remarks) | Open-market sale | 147 | $101.41 | $14.9K | Form 4 |
| 2026-09-08 | Lynch Thomas P. | Officer (See Remarks) | Open-market sale | 1,131 | $100.33 | $113.5K | Form 4 |
| 2026-09-08 | Lynch Thomas P. | Officer (See Remarks) | Open-market sale | 385 | $99.22 | $38.2K | Form 4 |
| 2026-09-08 | Lynch Thomas P. | Officer (See Remarks) | Open-market sale | 358 | $100.82 | $36.1K | Form 4 |
| 2026-09-08 | Lynch Thomas P. | Officer (See Remarks) | Open-market sale | 2,997 | $100.11 | $300.0K | Form 4 |
| 2026-09-08 | Lynch Thomas P. | Officer (See Remarks) | Open-market sale | 614 | $99.00 | $60.8K | Form 4 |
| 2026-09-08 | Lynch Thomas P. | Officer (See Remarks) | Open-market sale | 775 | $100.83 | $78.1K | Form 4 |
| 2026-09-08 | Lynch Thomas P. | Officer (See Remarks) | Open-market sale | 8,285 | $100.12 | $829.5K | Form 4 |
Ask the chat about BLLN's insider activity →
Transaction types are the SEC Form 4 codes: open-market purchases (P) and sales (S) are the only rows that reflect open-market conviction. Awards/vesting (A), option exercises (M/X/C), shares withheld for taxes (F) and gifts (G) are compensation or mechanical, not buying or selling on the open market. Sales may be planned and non-discretionary (e.g. a Rule 10b5-1 plan); open-market buying is not a recommendation to buy. Informational only — not financial advice.
Source: SEC EDGAR Form 3/4/5. See the full company profile: BillionToOne, Inc. (BLLN).
Last updated 2026-10-15 (most recent filing date).
Informational only — NOT financial advice. Insider filings are sourced from SEC EDGAR and shown with their reported dates.