SEC Form 4 · accession 0002088547-26-000004
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
Jun 24, 2026
Accepted (ET)
Jun 26, 2026 · 5:20 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 | Jun 24, 2026 | M | 4,000 | $8.65 | A | 216,000 | D | |
| Class A Common Stock | Jun 24, 2026 | S | 4,000 | $110.00 | D | 212,000 | D | |
| Class A Common Stock | Jun 24, 2026 | S | 4,000 | $110.00 | D | 208,000 | 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 | Jun 24, 2026 | M | 4,000 | D | — | Jan 18, 2033 | Class A Common Stock | 4,000 | 36,000 | 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.