BLLN (BillionToOne, Inc. Class A Common Stock)
Insider Trading Activity
Every open-market purchase and sale reported by BLLN officers, directors and 10%+ beneficial owners on SEC Form 4, which must be filed within two business days of the transaction. Sales often reflect scheduled 10b5-1 plans or tax withholding rather than a directional view, so read counts alongside the size and the filer.
Market data may be delayed, incomplete, or inaccurate. Not a recommendation to buy, sell, or hold any security. Verify quotes with your broker before trading. See Terms §17.
| Filed | Insider | Role | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-08-28 | KRISHNA KITTU KOLLURI | Director | J | — | — |
| 2026-08-27 | John Roderick ten Bosch | SVP of Laboratory Operations | Sell | — | — |
| 2026-08-27 | David Tsao | Chief Technology Officer | MIXED | — | — |
| 2026-08-12 | John Roderick ten Bosch | SVP of Laboratory Operations | Sell | — | — |
| 2026-08-12 | David Tsao | Chief Technology Officer | MIXED | — | — |
| 2026-08-07 | Oguzhan Atay | Chairman and CEO | MIXED | — | — |
| 2026-08-07 | Oguzhan Atay | Chairman and CEO | MIXED | — | — |
| 2026-08-05 | Oguzhan Atay | Chairman and CEO | MIXED | — | — |
| 2026-08-04 | Shan Riku Sakakibara | Chief Product Officer | Sell | — | — |
| 2026-07-20 | Nancy JoAnn Johnson | See Remarks | Sell | — | — |
| 2026-07-15 | John Roderick ten Bosch | SVP of Laboratory Operations | Sell | — | — |
| 2026-07-15 | David Tsao | Chief Technology Officer | MIXED | — | — |
| 2026-07-13 | Shan Riku Sakakibara | Chief Product Officer | MIXED | — | — |
| 2026-07-13 | Oguzhan Atay | Chairman and CEO | MIXED | — | — |
| 2026-07-08 | Oguzhan Atay | Chairman and CEO | MIXED | — | — |
| 2026-07-06 | Nancy JoAnn Johnson | See Remarks | Sell | — | — |
| 2026-07-01 | John Roderick ten Bosch | SVP of Laboratory Operations | Sell | — | — |
| 2026-06-26 | Shan Riku Sakakibara | Chief Product Officer | MIXED | — | — |
| 2026-06-17 | John Roderick ten Bosch | See Remarks | Sell | — | — |
| 2026-06-17 | David Tsao | Chief Technology Officer | MIXED | — | — |
| 2026-06-12 | Akshay Rai | Director | A | — | — |
| 2026-06-12 | Anthony Pagano | Director | A | — | — |
| 2026-06-12 | KRISHNA KITTU KOLLURI | Director | A | — | — |
| 2026-06-12 | Firat Ileri | Director | A | — | — |
| 2026-06-12 | Thomas S Bremner | Director | A | — | — |
| 2026-06-11 | NeoTribe Ventures I, L.P. | 10%+ Owner | J | — | — |
| 2026-06-11 | KRISHNA KITTU KOLLURI | Director | J | — | — |
| 2026-06-10 | Shan Riku Sakakibara | Chief Product Officer | Sell | — | — |
| 2026-06-10 | Nancy JoAnn Johnson | See Remarks | Sell | — | — |
| 2026-06-10 | Oguzhan Atay | See Remarks | MIXED | — | — |
| 2026-05-13 | NeoTribe Partners I, LLC | 10%+ Owner | J | — | — |
| 2026-05-13 | KRISHNA KITTU KOLLURI | Director | J | — | — |
| 2026-01-20 | Collective CommV Hummingbird | 10%+ Owner | MIXED | — | — |
| 2026-01-05 | Anthony Pagano | Director | A | — | — |
| Insider | Role | Shares Held | Value |
|---|---|---|---|
| — | 10%+ Owner | 2,439,258 | — |
| — | Chief Product Officer | 200,000 | — |
| — | Chairman and CEO | 168,750 | — |
| — | 10%+ Owner | 92,785 | — |
| — | Director | 69,189 | — |
| — | Director | 40,331 | — |
| — | SVP of Laboratory Operations | 26,467 | — |
| — | 10%+ Owner | 18,845 | — |
| — | Director | 14,026 | — |
| — | Director | 11,350 | — |
| — | Director | 7,913 | — |
| — | See Remarks | 7,806 | — |
| — | Chief Technology Officer | 1,000 | — |
Form 4 reports a change in beneficial ownership by an officer, director or 10%+ holder, and must be filed within two business days of the transaction — so this is close to real time, unlike the 45-day-lagged 13F institutional data.
Transaction codes matter more than the raw buy/sell count. Code P is an open-market purchase — an insider choosing to buy with their own money, which is the signal most research treats as informative. Code S is a sale, but sales are frequently pre-scheduled under a 10b5-1 plan or cover tax withholding on vesting equity, so a run of sales often says nothing directional. Codes A and M are grants and option exercises rather than open-market decisions.
Full filing history and per-insider positions are on the BLLN quote page; the site-wide leaderboard is on the insider transactions hub.