SEC Form 4 · accession 0002088547-26-000006
BillionToOne, Inc. · BLLN
Statement of changes in beneficial ownership, as filed. Original on EDGAR ↗
Reporting owner
Shan Riku Sakakibara
Officer — Chief Product Officer
Period of report
Jul 9, 2026
Accepted (ET)
Jul 13, 2026 · 4:39 pm EDT
Rule 10b5-1 plan
yes — trade under a plan
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 Stock | Jul 9, 2026 | M | 174 | $8.65 | A | 208,174 | D | |
| Class A Common Stock | Jul 9, 2026 | M | 1,117 | $30.78 | A | 209,291 | D | |
| Class A Common Stock | Jul 9, 2026 | M | 1,355 | $30.78 | A | 210,646 | D | |
| Class A Common Stock | Jul 9, 2026 | M | 1,354 | $30.78 | A | 212,000 | D | |
| Class A Common Stock | Jul 9, 2026 | S | 4,000 | $125.00 | D | 208,000 | D | |
| Class A Common Stock | Jul 9, 2026 | S | 174 | $125.00 | D | 207,826 | D | |
| Class A Common Stock | Jul 9, 2026 | S | 1,117 | $125.00 | D | 206,709 | D | |
| Class A Common Stock | Jul 9, 2026 | S | 1,355 | $125.00 | D | 205,354 | D | |
| Class A Common Stock | Jul 9, 2026 | S | 1,354 | $125.00 | D | 204,000 | D |
Table II — derivative securities
| Security | Conv. / exercise price | Date | Code | Shares | A/D | Exercisable | Expires | Underlying | Underlying shares | Owned after | D/I |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Stock Option (right to buy)F2 | $8.65 | Jul 9, 2026 | M | 174 | D | — | Jan 18, 2033 | Class A Common Stock | 174 | 35,826 | D |
| Stock Option (right to buy)F2 | $30.78 | Jul 9, 2026 | M | 1,117 | D | — | Sep 30, 2035 | Class A Common Stock | 1,117 | 63,883 | D |
| Stock Option (right to buy)F2 | $30.78 | Jul 9, 2026 | M | 1,355 | D | — | Sep 30, 2035 | Class A Common Stock | 1,355 | 62,528 | D |
| Stock Option (right to buy)F2 | $30.78 | Jul 9, 2026 | M | 1,354 | D | — | Sep 30, 2035 | Class A Common Stock | 1,354 | 61,174 | D |
Explanation of responses
- F1The transactions reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 6, 2026.
- F2The options are fully vested and exercisable. The terms of the underlying option grant are as previously reported on the Reporting Person's Form 3 filed on November 5, 2025.