SEC Form 4 · accession 0002088549-26-000006
BillionToOne, Inc. · BLLN
Statement of changes in beneficial ownership, as filed. Original on EDGAR ↗
Reporting owner
Oguzhan Atay
Officer — Chairman and CEO · Director
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 | 12,500 | $2.80 | A | 12,500 | D | |
| Class A Common StockF2 | Jul 9, 2026 | S | 7,489 | $125.4264 | D | 5,011 | D | |
| Class A Common StockF3 | Jul 9, 2026 | S | 2,002 | $126.4839 | D | 3,009 | D | |
| Class A Common StockF4 | Jul 9, 2026 | S | 2,657 | $127.4366 | D | 352 | D | |
| Class A Common StockF5 | Jul 9, 2026 | S | 352 | $128.2318 | D | 0 | 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)F6 | $2.80 | Jul 9, 2026 | M | 12,500 | D | — | Jun 7, 2031 | Class A Common Stock | 12,500 | 575,000 | 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 reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $125.000 to $125.910 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.
- F3The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $126.085 to $127.040 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.
- F4The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $127.100 to $128.060 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.
- F5The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $128.180 to $128.295 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.
- F6The options are fully vested and exercisable.