BillionToOne, Inc. Insider Trading Activity
Every SEC Form 4 insider transaction reported for BillionToOne, Inc. (BLLN), sourced directly from SEC EDGAR and updated as new filings are accepted.
By Trabud · Insider-trading data from SEC EDGAR
Latest filing:
Compiled automatically from SEC EDGAR Form 4 filings and refreshed daily. Figures count purchases (code P) and sales (code S) only — not grants, option exercises, or gifts. How this page is built. Not investment advice.
Quick Answer
Are BLLN insiders buying or selling?
In the last 12 months, BillionToOne, Inc. insiders reported 5 open-market purchases ($678.0K) and 34 sales ($51.3M) — net selling of $50.7M. Since November 2025, Trabud has recorded 39 Form 4 filings for BLLN: 5 buys ($678.0K) and 34 sells ($51.3M).
Source: SEC EDGAR Form 4
What stands out
- The largest open-market purchase in the last 12 months was $414.0K by Nancy Joann Johnson (Senior Vice President of Sales and Commercial Operations) on Nov 12, 2025. SEC ↗
- The most recent open-market purchase was reported on Nov 12, 2025 (11 months ago).
Key Statistics (November 2025 – Oct 16, 2026)
Total Form 4 filings
39
SEC EDGAR
Insider filers
7
Insider buys (5)
$678.0K
Insider sells (34)
$51.3M
Insider sentiment
Net sellingNet insider flow of $50.7M in net selling since November 2025, and $50.7M in net selling over the last 12 months.
Recent BLLN insider transactions
| Date | Insider | Role | Type | Shares | Price | Value | Filing |
|---|---|---|---|---|---|---|---|
| Oct 16, 2026 | Oguzhan Atay | Chairman and CEO | Sale | 11.0K | $99.14 | $1.1M | SEC ↗ |
| Oct 14, 2026 | Oguzhan Atay | Chairman and CEO | Sale | 19.3K | $94.31 | $1.8M | SEC ↗ |
| Oct 7, 2026 | John Roderick Ten Bosch | SVP of Laboratory Operations | Sale | 2.8K | $105.15 | $298.0K | SEC ↗ |
| Oct 7, 2026 | David Tsao | Chief Technology Officer | Sale | 20.0K | $108.15 | $2.2M | SEC ↗ |
| Oct 1, 2026 | Oguzhan Atay | Chairman and CEO | Sale | 11.0K | $120.64 | $1.3M | SEC ↗ |
| Sep 28, 2026 | David Tsao | Chief Technology Officer | Sale | 3.3K | $125.00 | $416.6K | SEC ↗ |
| Sep 28, 2026 | John Roderick Ten Bosch | SVP of Laboratory Operations | Sale | 1.4K | $120.00 | $169.9K | SEC ↗ |
| Sep 23, 2026 | John Roderick Ten Bosch | SVP of Laboratory Operations | Sale | 1.4K | $106.61 | $151.0K | SEC ↗ |
| Sep 21, 2026 | Thomas P. Lynch | General Counsel, Chief Compliance Officer and Secretary | Sale | 35.1K | $110.33 | $3.9M | SEC ↗ |
| Sep 16, 2026 | Oguzhan Atay | Chairman and CEO | Sale | 30.3K | $99.91 | $3.0M | SEC ↗ |
| Sep 11, 2026 | John Roderick Ten Bosch | SVP of Laboratory Operations | Sale | 1.4K | $97.54 | $138.1K | SEC ↗ |
| Sep 11, 2026 | David Tsao | Chief Technology Officer | Sale | 20.0K | $98.77 | $2.0M | SEC ↗ |
| Sep 10, 2026 | Thomas P. Lynch | General Counsel, Chief Compliance Officer and Secretary | Sale | 20.0K | $99.99 | $2.0M | SEC ↗ |
| Aug 28, 2026 | David Tsao | Chief Technology Officer | Sale | 10.0K | $100.00 | $1.0M | SEC ↗ |
| Aug 28, 2026 | John Roderick Ten Bosch | SVP of Laboratory Operations | Sale | 1.4K | $100.00 | $141.7K | SEC ↗ |
| Aug 12, 2026 | John Roderick Ten Bosch | SVP of Laboratory Operations | Sale | 1.4K | $92.86 | $131.6K | SEC ↗ |
| Aug 12, 2026 | David Tsao | Chief Technology Officer | Sale | 10.0K | $92.86 | $928.6K | SEC ↗ |
| Aug 7, 2026 | Oguzhan Atay | Chairman and CEO | Sale | 15.5K | $150.03 | $2.3M | SEC ↗ |
| Aug 6, 2026 | Oguzhan Atay | Chairman and CEO | Sale | 45.0K | $137.07 | $6.2M | SEC ↗ |
| Aug 4, 2026 | Shan Riku Sakakibara | Chief Product Officer | Sale | 4.0K | $140.21 | $560.8K | SEC ↗ |
| Jul 20, 2026 | Nancy Joann Johnson | Senior Vice President of Sales and Commercial Operations | Sale | 14.2K | $128.29 | $1.8M | SEC ↗ |
| Jul 15, 2026 | John Roderick Ten Bosch | SVP of Laboratory Operations | Sale | 4.3K | $125.46 | $533.3K | SEC ↗ |
| Jul 15, 2026 | David Tsao | Chief Technology Officer | Sale | 20.0K | $124.88 | $2.5M | SEC ↗ |
| Jul 13, 2026 | Oguzhan Atay | Chairman and CEO | Sale | 12.5K | $126.10 | $1.6M | SEC ↗ |
| Jul 13, 2026 | Shan Riku Sakakibara | Chief Product Officer | Sale | 8.0K | $125.00 | $1.0M | SEC ↗ |
Showing the 25 most recent of 39 Form 4 filings for BillionToOne, Inc..
Most active BLLN insiders
- John Roderick Ten Bosch10 filings
- Oguzhan Atay9 filings
- David Tsao8 filings
- Nancy Joann Johnson4 filings
- Shan Riku Sakakibara4 filings
Ask anything about BLLN insider activity
Use Trabud's AI agent to query BillionToOne, Inc.'s Form 4 history in plain English — "Show me BLLN CEO purchases this year" or compare it against any other ticker.
Open the AI agentBLLN insider trading FAQ
Are BillionToOne, Inc. insiders buying or selling?
In the last 12 months, BillionToOne, Inc. insiders reported 5 open-market purchases ($678.0K) and 34 sales ($51.3M) — net selling of $50.7M. Since November 2025, Trabud has recorded 39 Form 4 filings for BLLN: 5 buys ($678.0K) and 34 sells ($51.3M). Over the full record that is net selling of $50.7M.
How many insiders trade BLLN stock?
7 distinct insider filers — officers, directors, 10%+ owners, and investment groups filing jointly — have reported Form 4 transactions for BillionToOne, Inc.. The most recent filing was accepted on Oct 16, 2026.
Where does Trabud get BLLN insider trading data?
All BLLN insider trading data comes directly from official SEC EDGAR Form 4 filings, which corporate insiders must submit within two business days of a transaction under Section 16(a) of the Securities Exchange Act of 1934.