SEC Form 4 · accession 0002087127-26-000009
BillionToOne, Inc. · BLLN
Statement of changes in beneficial ownership, as filed. Original on EDGAR ↗
Reporting owner
David Tsao
Officer — Chief Technology Officer · Director
Period of report
Sep 3, 2026
Accepted (ET)
Sep 8, 2026 · 9:55 pm EDT
Rule 10b5-1 plan
box not checked
Issuer CIK
0002070849
Table I — non-derivative securities
| Security | Date | Code | Shares | Price | A/D | Owned after | D/I | Nature of ownership |
|---|---|---|---|---|---|---|---|---|
| Class A Common StockF1 | Sep 3, 2026 | C | 20,000 | $0.00 | A | 21,000 | D | |
| Class A Common Stock | Sep 8, 2026 | G | 20,000 | $0.00 | D | 1,000 | D |
Table II — derivative securities
| Security | Conv. / exercise price | Date | Code | Shares | A/D | Exercisable | Expires | Underlying | Underlying shares | Owned after | D/I |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Class B Common StockF1,F2 | — | Sep 3, 2026 | C | 20,000 | D | — | — | Class A Common Stock | 20,000 | 2,305,108 | D |
Explanation of responses
- F1These shares of Class B common stock were converted at a 1:1 ratio for shares of Class A common stock at the option of the holder.
- F2Each share of Class B Common Stock is convertible into one share of Class A common stock at the option of the holder. Class B common stock will convert automatically on a one-for-one basis into shares of the Issuer's Class A common stock upon the earliest of (i) seven years from the date of filing of the amended and restated certificate of incorporation, in connection with the Offering and (ii) the date specified by a vote of the holders of Class B common stock representing a majority of the outstanding shares of Class B common stock.