BillionToOne, Inc. (BLLN) Insider Trading
Directors, officers and holders of more than 10% of BLLN report their trades in its stock on SEC Form 4, within two business days. Each row below is one Form 4 transaction line. The one-letter code says what kind of transaction it was: only P (purchase) and S (sale) are open-market or private trades; awards, option exercises, tax withholding and gifts carry other codes.
Recent Form 4 transactions
The 50 most recent of 584 transactions on file: 0 with code P, 31 with code S and 19 with other codes.
| Date | Insider | Title | Code | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Oct 28, 2026 | Atay Oguzhan | Chairman and CEO | S Sale | 8,333 | $118.00 | $983,294 |
| Oct 28, 2026 | Atay Oguzhan | Chairman and CEO | S Sale | 2,667 | $118.00 | $314,706 |
| Oct 28, 2026 | Atay Oguzhan | Chairman and CEO | M Exercise | 8,333 | $2.80 | $23,332 |
| Oct 28, 2026 | Atay Oguzhan | Chairman and CEO | M Exercise | 8,333 | $2.80 | $23,332 |
| Oct 15, 2026 | Atay Oguzhan | Chairman and CEO | S Sale | 980 | $101.79 | $99,751 |
| Oct 15, 2026 | Atay Oguzhan | Chairman and CEO | M Exercise | 5,150 | $2.80 | $14,420 |
| Oct 15, 2026 | Atay Oguzhan | Chairman and CEO | S Sale | 133 | $102.78 | $13,669 |
| Oct 15, 2026 | Atay Oguzhan | Chairman and CEO | S Sale | 900 | $98.43 | $88,590 |
| Oct 15, 2026 | Atay Oguzhan | Chairman and CEO | S Sale | 1,861 | $99.84 | $185,809 |
| Oct 15, 2026 | Atay Oguzhan | Chairman and CEO | S Sale | 1,276 | $100.60 | $128,369 |
| Oct 15, 2026 | Atay Oguzhan | Chairman and CEO | M Exercise | 5,150 | $2.80 | $14,420 |
| Oct 14, 2026 | Atay Oguzhan | Chairman and CEO | S Sale | 2,667 | $98.00 | $261,366 |
| Oct 14, 2026 | Atay Oguzhan | Chairman and CEO | M Exercise | 3,183 | $2.80 | $8,912 |
| Oct 14, 2026 | Atay Oguzhan | Chairman and CEO | M Exercise | 3,183 | $2.80 | $8,912 |
| Oct 14, 2026 | Atay Oguzhan | Chairman and CEO | S Sale | 100 | $99.00 | $9,900 |
| Oct 14, 2026 | Atay Oguzhan | Chairman and CEO | S Sale | 3,083 | $98.32 | $303,120 |
| Oct 13, 2026 | Lynch Thomas P. | See Remarks | M Exercise | 2,000 | $8.65 | $17,300 |
| Oct 13, 2026 | Lynch Thomas P. | See Remarks | M Exercise | 2,000 | $8.65 | $17,300 |
| Oct 12, 2026 | Atay Oguzhan | Chairman and CEO | S Sale | 3,869 | $94.61 | $366,059 |
| Oct 12, 2026 | Atay Oguzhan | Chairman and CEO | S Sale | 2,667 | $97.61 | $260,326 |
| Oct 12, 2026 | Atay Oguzhan | Chairman and CEO | S Sale | 1,521 | $96.39 | $146,613 |
| Oct 12, 2026 | Atay Oguzhan | Chairman and CEO | S Sale | 6,763 | $93.65 | $633,335 |
| Oct 12, 2026 | Atay Oguzhan | Chairman and CEO | M Exercise | 16,667 | $2.80 | $46,668 |
| Oct 12, 2026 | Atay Oguzhan | Chairman and CEO | S Sale | 1,961 | $91.57 | $179,571 |
| Oct 12, 2026 | Atay Oguzhan | Chairman and CEO | S Sale | 2,553 | $93.05 | $237,546 |
| Oct 12, 2026 | Atay Oguzhan | Chairman and CEO | M Exercise | 16,667 | $2.80 | $46,668 |
| Oct 8, 2026 | Lynch Thomas P. | See Remarks | M Exercise | 8,000 | $8.65 | $69,200 |
| Oct 8, 2026 | Lynch Thomas P. | See Remarks | M Exercise | 8,000 | $8.65 | $69,200 |
| Oct 5, 2026 | Tsao David | Chief Technology Officer | M Exercise | 10,000 | $2.80 | $28,000 |
| Oct 5, 2026 | Tsao David | Chief Technology Officer | M Exercise | 10,000 | $2.80 | $28,000 |
| Oct 5, 2026 | ten Bosch John Roderick | SVP of Laboratory Operations | S Sale | 1,417 | $105.15 | $148,998 |
| Oct 5, 2026 | Tsao David | Chief Technology Officer | S Sale | 1,829 | $109.14 | $199,625 |
| Oct 5, 2026 | ten Bosch John Roderick | SVP of Laboratory Operations | S Sale | 1,417 | $105.15 | $148,998 |
| Oct 5, 2026 | Tsao David | Chief Technology Officer | S Sale | 2,200 | $107.47 | $236,435 |
| Oct 5, 2026 | Tsao David | Chief Technology Officer | S Sale | 4,284 | $108.39 | $464,356 |
| Oct 5, 2026 | Tsao David | Chief Technology Officer | S Sale | 20 | $110.08 | $2,202 |
| Oct 5, 2026 | Tsao David | Chief Technology Officer | S Sale | 4,916 | $108.53 | $533,554 |
| Oct 5, 2026 | Tsao David | Chief Technology Officer | M Exercise | 10,000 | $2.80 | $28,000 |
| Oct 5, 2026 | Tsao David | Chief Technology Officer | M Exercise | 10,000 | $2.80 | $28,000 |
| Oct 5, 2026 | Tsao David | Chief Technology Officer | S Sale | 2,921 | $109.00 | $318,398 |
| Oct 5, 2026 | Tsao David | Chief Technology Officer | S Sale | 555 | $105.56 | $58,585 |
| Oct 5, 2026 | Tsao David | Chief Technology Officer | S Sale | 400 | $106.10 | $42,442 |
| Oct 5, 2026 | Tsao David | Chief Technology Officer | S Sale | 866 | $105.90 | $91,710 |
| Oct 5, 2026 | Tsao David | Chief Technology Officer | S Sale | 100 | $110.09 | $11,009 |
| Oct 5, 2026 | Tsao David | Chief Technology Officer | S Sale | 1,909 | $107.19 | $204,635 |
| Sep 28, 2026 | Atay Oguzhan | Chairman and CEO | S Sale | 2,666 | $120.64 | $321,626 |
| Sep 28, 2026 | Atay Oguzhan | Chairman and CEO | S Sale | 8,333 | $120.64 | $1,005,293 |
| Sep 28, 2026 | Atay Oguzhan | Chairman and CEO | M Exercise | 8,333 | $2.80 | $23,332 |
| Sep 28, 2026 | Atay Oguzhan | Chairman and CEO | M Exercise | 8,333 | $2.80 | $23,332 |
| Sep 24, 2026 | Tsao David | Chief Technology Officer | M Exercise | 3,333 | $2.80 | $9,332 |
The full Form 4 history is on the BLLN company page (Insider Trades card, View all).
Questions about this data
Which insider transactions are open-market trades?
Code P (open market or private purchase) and code S (open market or private sale). Code F is shares withheld to pay tax on vesting stock, A is an award from the company, M and X are option exercises and G is a gift. None of those is the insider choosing to buy or sell in the market.
How quickly are insider trades reported?
A Form 4 is due before the end of the second business day after the trade. The date shown is the transaction date from the form.
Who has to file Form 4?
Officers, directors and beneficial owners of more than 10% of a class of the company’s registered equity, under Section 16 of the Securities Exchange Act.
Look up any code in the Form 4 transaction code reference, or read Form 4 codes explained.