Lynch Thomas P.'s Form 4 filing
BillionToOne, Inc. (BLLN) · filed Sep 21, 2026
- Accession no.
- 0002070849-26-000069
- Filed
- Sep 21, 2026, 7:00 PM ET
- Trade date
- Sep 17, 2026
- Filing delay
- 4 days
- Rule 10b5-1 plan
- Checked
This filing lists 8 non-derivative transactions and 4 derivative transactions. Open-market sales total $3.87M. It was filed 4 days after the trade.
Reporting owners
A Form 4 can have several reporting owners, such as a person and a fund they control. Trade tables show the first one.
| Owner | Relationship to the company |
|---|---|
| Lynch Thomas P.CIK 0001659824 | Officer (See Remarks) |
Non-derivative securities (Table I)
Acquisitions and disposals of common stock and similar shares, one row per line on the filing.
| Trade date | Security | Transaction | Shares | Price | Value | Shares after | Ownership | Flags |
|---|---|---|---|---|---|---|---|---|
| Sep 17, 2026 | Class A Common Stock | MOption exerciseAcquired | +19,384 | $8.65 | +$167,671.6 | 20,084 | Direct | |
| Sep 17, 2026 | Class A Common Stock | MOption exerciseAcquired | +6,968 | $11.55 | +$80,480.4 | 27,052 | Direct | |
| Sep 17, 2026 | Class A Common Stock | MOption exerciseAcquired | +2,920 | $17.12 | +$49,990.4 | 29,972 | Direct | |
| Sep 17, 2026 | Class A Common Stock | MOption exerciseAcquired | +5,840 | $30.78 | +$179,755.2 | 35,812 | Direct | |
| Sep 17, 2026 | Class A Common Stock | SSaleDisposed | −19,384 | $110.36F2 | −$2,139,193.04 | 16,428 | Direct | |
| Sep 17, 2026 | Class A Common Stock | SSaleDisposed | −6,968 | $110.30F3 | −$768,560.64 | 9,460 | Direct | |
| Sep 17, 2026 | Class A Common Stock | SSaleDisposed | −2,920 | $110.31F3 | −$322,100.24 | 6,540 | Direct | |
| Sep 17, 2026 | Class A Common Stock | SSaleDisposed | −5,840 | $110.29F2 | −$644,111.7 | 700 | Direct |
Derivative securities (Table II)
Options, warrants, restricted stock units and similar. Shares are the underlying shares; price and value are for the derivative itself, and the holding after is in derivative units.
| Trade date | Security | Transaction | Underlying shares | Unit price | Value | Held after | Ownership | Flags |
|---|---|---|---|---|---|---|---|---|
| Sep 17, 2026 | Class A Common Stock | MOption exerciseDisposed | −19,384 | $8.65 | −$167,671.6 | 48,974 | Direct | |
| Sep 17, 2026 | Class A Common Stock | MOption exerciseDisposed | −6,968 | $11.55 | −$80,480.4 | 4,063 | Direct | |
| Sep 17, 2026 | Class A Common Stock | MOption exerciseDisposed | −2,920 | $17.12 | −$49,990.4 | 5,417 | Direct | |
| Sep 17, 2026 | Class A Common Stock | MOption exerciseDisposed | −5,840 | $30.78 | −$179,755.2 | 30,834 | Direct |
Footnotes and remarks
Livermore keeps the footnotes that transaction prices refer to, all footnotes of amendments (Form 4/A) and the filing's remarks. Other footnotes, such as how indirect holdings are held or the details of a trading plan, are only in the original on SEC EDGAR.
- F2
The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $110.000 to $110.970 per share, inclusive. The holder undertakes to provide, upon written request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.
Referenced by the price of 2 transactions in Table I.
- F3
The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $110.000 to $110.890 per share, inclusive. The holder undertakes to provide, upon written request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.
Referenced by the price of 2 transactions in Table I.
Remarks
General Counsel, Chief Compliance Officer and Secretary