Form 4 for BLLN BillionToOne, Inc.
Accepted 2025-11-12 00:00:00 ET · period of report 2025-11-07 · accession 0001193125-25-278138 · SEC index · Original document
Summary rows
Aggregated the way they appear in lists: one row per insider, transaction code and security table.
| X | Filed | Traded | Ticker | Insider | Title | Type | Price | Qty | Owned | ΔOwn | Value |
|---|---|---|---|---|---|---|---|---|---|---|---|
| D | 2025-11-12 | 2025-11-07 | BLLN | Tsao David | CTO, Dir | P - Purchase | $60.00 | +1,000 | 1,000 | New | +$60.0K |
| DM | 2025-11-12 | 2025-11-07 | BLLN | Tsao David | CTO, Dir | J - Other | — | -2.33M | 0 | -100% | — |
| DM | 2025-11-12 | 2025-11-07 | BLLN | Tsao David | CTO, Dir | J - Other | $0.00 | +2.33M | 0 | New | $0 |
Purchase Sale Sale after option exercise All abbreviations
Every reported transaction
| # | Table | Security | Date | Code | A/D | Shares | Price | Owned after | Own | Exercise / expiry | Underlying | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Common | Class A Common Stock | 2025-11-07 | P | A | 1,000 | $60.00 | 1,000 | D | — | — | |
| 2 | Common | Class A Common Stock | 2025-11-07 | J | D | 2,325,108 | — | 0 | D | — | — | (F2) Following the reclassification of Common Stock into Class A Common Stock, the shares of Class A common stock were exchanged at a 1:1 ratio for shares of Class B common stock in a transaction previously approved by the Issuer's board of directors. |
| 3 | Common | Class A Common Stock | 2025-11-07 | J | A | 2,325,108 | — | 2,325,108 | D | — | — | (F1) Pursuant to a reclassification exempt under Rule 16b-7, each share of Common Stock was automatically reclassified into one share of Class A common stock immediately prior to the completion of the Issuer's initial public offering of Class A common stock (the "Offering"). |
| 4 | Common | Common Stock | 2025-11-07 | J | D | 2,325,108 | — | 0 | D | — | — | (F1) Pursuant to a reclassification exempt under Rule 16b-7, each share of Common Stock was automatically reclassified into one share of Class A common stock immediately prior to the completion of the Issuer's initial public offering of Class A common stock (the "Offering"). |
| 5 | Derivative | Stock Option (right to buy) | 2025-11-07 | J | A | 501,551 | — | 501,551 | D | $20.04 · — to 2035-06-18 | 501,551 Class A Common Stock | (F1) Pursuant to a reclassification exempt under Rule 16b-7, each share of Common Stock was automatically reclassified into one share of Class A common stock immediately prior to the completion of the Issuer's initial public offering of Class A common stock (the "Offering"). (F6) The options are subject to a service-based vesting requirement, which shall be satisfied over a six-year period. The options vest and become exercisable in equal monthly installments commencing on June 11, 2025, subject to the Reporting Person's continuous service with the Issuer through each such vesting date. |
| 6 | Derivative | Stock Option (right to buy) | 2025-11-07 | J | D | 640,000 | — | 0 | D | $2.80 · — to 2031-06-07 | 640,000 Common Stock | (F1) Pursuant to a reclassification exempt under Rule 16b-7, each share of Common Stock was automatically reclassified into one share of Class A common stock immediately prior to the completion of the Issuer's initial public offering of Class A common stock (the "Offering"). (F5) The options are fully vested and exercisable. |
| 7 | Derivative | Class B Common Stock | 2025-11-07 | J | A | 2,325,108 | $0.00 | 2,325,108 | D | — · — to — | 2,325,108 Class A Common Stock | (F4) Each 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. |
| 8 | Derivative | Stock Option (right to buy) | 2025-11-07 | J | A | 640,000 | — | 640,000 | D | $2.80 · — to 2031-06-07 | 640,000 Class A Common Stock | (F1) Pursuant to a reclassification exempt under Rule 16b-7, each share of Common Stock was automatically reclassified into one share of Class A common stock immediately prior to the completion of the Issuer's initial public offering of Class A common stock (the "Offering"). (F5) The options are fully vested and exercisable. |
| 9 | Derivative | Stock Option (right to buy) | 2025-11-07 | J | D | 501,551 | — | 0 | D | $20.04 · — to 2035-06-18 | 501,551 Common Stock | (F1) Pursuant to a reclassification exempt under Rule 16b-7, each share of Common Stock was automatically reclassified into one share of Class A common stock immediately prior to the completion of the Issuer's initial public offering of Class A common stock (the "Offering"). (F6) The options are subject to a service-based vesting requirement, which shall be satisfied over a six-year period. The options vest and become exercisable in equal monthly installments commencing on June 11, 2025, subject to the Reporting Person's continuous service with the Issuer through each such vesting date. |