BLLN BillionToOne, Inc.
BillionToOne, Inc. (BLLN) Insider Activity
What the officers, directors and large holders did with their own shares. Only open-market purchases and sales count toward the totals — grants, option exercises and shares withheld for tax are compensation mechanics, not decisions, and they're listed separately below.
How much of that selling was preplanned? 100% planned / 0% discretionary
Largest single sale: $2.3M.
Where they traded
Last open-market purchase: November 7, 2025 , by Lynch Thomas P. .
Recent open-market activity
| Date | Insider | Role | Action | Shares | Price | Value | Held after |
|---|---|---|---|---|---|---|---|
| ten Bosch John Roderick | SVP of Laboratory Operations | Sell 10b5-1 | 1,416 | $106.61 | $151.0K | 23,635 −5.7% of holding | |
| Lynch Thomas P. 4 fills | See Remarks | Sell 10b5-1 | 35,112 | $110.33 | $3.9M | 16,428 −68.1% of holding | |
| Atay Oguzhan 10 fills | Chairman and CEO | Sell 10b5-1 | 30,331 | $99.91 | $3.0M | 159,834 −15.9% of holding | |
| Tsao David 2 fills | Chief Technology Officer | Sell 10b5-1 | 20,000 | $98.77 | $2.0M | 11,000 −64.5% of holding | |
| ten Bosch John Roderick | SVP of Laboratory Operations | Sell 10b5-1 | 1,416 | $97.54 | $138.1K | 25,051 −5.4% of holding | |
| Lynch Thomas P. 13 fills | See Remarks | Sell 10b5-1 | 20,000 | $99.99 | $2.0M | 20,662 −49.2% of holding | |
| Tsao David | Chief Technology Officer | Sell 10b5-1 | 10,000 | $100.00 | $1.0M | 1,000 −90.9% of holding | |
| ten Bosch John Roderick | SVP of Laboratory Operations | Sell 10b5-1 | 1,417 | $100.00 | $141.7K | 26,467 −5.1% of holding | |
| Tsao David | Chief Technology Officer | Sell 10b5-1 | 10,000 | $92.86 | $928.6K | 1,000 −90.9% of holding | |
| ten Bosch John Roderick | SVP of Laboratory Operations | Sell 10b5-1 | 1,417 | $92.86 | $131.6K | 27,884 −4.8% of holding | |
| Atay Oguzhan | Chairman and CEO | Sell 10b5-1 | 15,539 | $150.03 | $2.3M | None left | |
| Atay Oguzhan 23 fills | Chairman and CEO | Sell 10b5-1 | 45,000 | $137.07 | $6.2M | 168,750 −21.1% of holding | |
| Sakakibara Shan Riku | Chief Product Officer | Sell 10b5-1 | 4,000 | $140.21 | $560.8K | 200,000 −2% of holding | |
| Johnson Nancy JoAnn 4 fills | See Remarks | Sell 10b5-1 | 14,199 | $128.29 | $1.8M | 18,966 −42.8% of holding | |
| Tsao David 10 fills | Chief Technology Officer | Sell 10b5-1 | 20,000 | $124.88 | $2.5M | 19,898 −50.1% of holding | |
| ten Bosch John Roderick 3 fills | SVP of Laboratory Operations | Sell 10b5-1 | 4,251 | $125.46 | $533.3K | 32,135 −11.7% of holding | |
| Atay Oguzhan 4 fills | Chairman and CEO | Sell 10b5-1 | 12,500 | $126.10 | $1.6M | 5,011 −71.4% of holding | |
| Sakakibara Shan Riku 5 fills | Chief Product Officer | Sell 10b5-1 | 8,000 | $125.00 | $1.0M | 208,000 −3.7% of holding | |
| Atay Oguzhan 28 fills | Chairman and CEO | Sell 10b5-1 | 38,750 | $122.05 | $4.7M | 186,466 −17.2% of holding | |
| Johnson Nancy JoAnn | See Remarks | Sell 10b5-1 | 801 | $124.91 | $100.1K | 21,099 −3.7% of holding | |
| ten Bosch John Roderick | SVP of Laboratory Operations | Sell 10b5-1 | 1,416 | $120.00 | $169.9K | 33,552 −4% of holding |
Form 4s are due within two business days of a transaction, so this is close to real time — unlike the quarterly 13F data on the Institutional tab. A single large sale often reflects a prearranged 10b5-1 plan rather than a fresh view, so read a pattern of sales rather than any one of them.