BLLN
BillionToOne, Inc. · Healthcare · Market cap $5.8B
Insiders sold $28.4M net in the last 90 days ·5 sellers, 0 buyers· 21 of 21 sales under Rule 10b5-1 plans· latest Form 4 filed Oct 16, 2026
Insider Buying
$3.2M
reported purchases (SEC code P)
Insider Selling
$48.2M
reported sales (SEC code S)
Unique Insiders
8
in the rolling window
Latest filing
Oct 19, 2026
Atay Oguzhan
BillionToOne, Inc. (BLLN) has 63 SEC Form 4 filings (419 transaction rows) in the rolling window, disclosed by 8 distinct insiders. Most recent filing: Oct 19, 2026.
Inside the rolling window, 8 insiders at BillionToOne, Inc. reported 6 open-market purchases totaling $3.2M and 36 open-market sales totaling $48.2M. The most active filer is Chairman and CEO Atay Oguzhan with 10 filings. Insiders have net sold $48.2M over the trailing 6 months. The most recent open-market filing is a sale of 5,850 shares by Chairman and CEO Atay Oguzhan, dated Oct 14, 2026, worth $574K.
- Industry:Medical - Diagnostics & Research
- CEO:Oguzhan Atay
- Employees:713
- HQ:Menlo Park, CA, US
- IPO:2025-11-06
| Source | |||||||
|---|---|---|---|---|---|---|---|
| Chairman and CEO | Sale | 5,850 | $574K | Oct 16 | +7.7% | SEC ↗ | |
| Chairman and CEO | Sale | 5,150 | $516K | Oct 16 | +7.7% | SEC ↗ | |
| Chairman and CEO | Sale | 19,334 | $1.8M | Oct 14 | +8.0% | SEC ↗ | |
| SVP of Laboratory Operations | Sale | 1,417 | $149K | Oct 7 | — | SEC ↗ | |
| Chief Technology Officer | Sale | 20,000 | $2.2M | Oct 7 | — | SEC ↗ | |
| Chairman and CEO | Sale | 10,999 | $1.3M | Oct 1 | — | SEC ↗ | |
| Chief Technology Officer | Sale | 3,333 | $417K | Sep 28 | — | SEC ↗ | |
| SVP of Laboratory Operations | Sale | 1,416 | $170K | Sep 28 | — | SEC ↗ | |
| SVP of Laboratory Operations | Sale | 1,416 | $151K | Sep 23 | — | SEC ↗ | |
| See Remarks | Sale | 35,112 | $3.9M | Sep 21 | — | SEC ↗ | |
| Chairman and CEO | Sale | 27,665 | $2.8M | Sep 16 | — | SEC ↗ | |
| Chief Technology Officer | Sale | 20,000 | $2.0M | Sep 11 | — | SEC ↗ | |
| SVP of Laboratory Operations | Sale | 1,416 | $138K | Sep 11 | — | SEC ↗ | |
Lynch Thomas P.First in 10 months | See Remarks | Sale | 20,000 | $2.0M | Sep 10 | — | SEC ↗ |
| Chief Technology Officer | Sale | 10,000 | $1.0M | Aug 28 | — | SEC ↗ | |
| SVP of Laboratory Operations | Sale | 1,417 | $142K | Aug 28 | — | SEC ↗ | |
| SVP of Laboratory Operations | Sale | 1,417 | $132K | Aug 12 | — | SEC ↗ | |
| Chief Technology Officer | Sale | 10,000 | $929K | Aug 12 | — | SEC ↗ | |
| Chairman and CEO | Sale | 15,539 | $2.3M | Aug 7 | — | SEC ↗ | |
| Chairman and CEO | Sale | 38,577 | $5.3M | Aug 6 | — | SEC ↗ | |
| Chief Product Officer | Sale | 4,000 | $561K | Aug 4 | — | SEC ↗ | |
| See Remarks | Sale | 14,199 | $1.8M | Jul 20 | — | SEC ↗ | |
| Chief Technology Officer | Sale | 20,000 | $2.5M | Jul 15 | — | SEC ↗ | |
| SVP of Laboratory Operations | Sale | 1,417 | $178K | Jul 15 | — | SEC ↗ | |
| Chairman and CEO | Sale | 12,500 | $1.6M | Jul 13 | — | SEC ↗ |
Earnings: last 7 quarters
Frequently asked questions
How many SEC Form 4 insider filings does BLLN have?
BillionToOne, Inc. (BLLN) has 63 SEC Form 4 filings (419 transaction rows) in the rolling 365-day window, disclosed by 8 distinct insiders. Most recent filing: Oct 19, 2026.
When was the most recent SEC Form 4 filing for BLLN?
The most recent Form 4 filing for BLLN on Tracefour is dated Oct 19, 2026.
Who is the most active insider at BLLN?
The most active SEC Form 4 filer at BLLN in the rolling window is Chairman and CEO Atay Oguzhan, with 10 filings.
What is the net insider flow at BLLN over the last 6 months?
Over the trailing 180 days, insiders at BLLN have net sold $48.2M based on SEC Form 4 disclosures.
What is the total insider buy and sell value at BLLN in the current window?
Inside the rolling window, insiders at BLLN bought $3.2M and sold $48.2M based on SEC Form 4 filings.
Can I get alerts for BLLN insider trading?
Yes. Tracefour sends a free email when a new SEC Form 4 purchase or sale is filed at BillionToOne, Inc. (BLLN). Alerts are set per company from the page itself, there is no paid tier, and each email links to the original filing on SEC EDGAR.
Related companies
BillionToOne, Inc. is in the Healthcare sector.