Taylor Ross 4

4 · BillionToOne, Inc. · Filed Nov 12, 2025

Form 4

Period: 2025-11-07

Chief Financial Officer

Transactions

Other
Stock Option (right to buy)
2025-11-07−175,000→ 0 total
Exercise: $11.55Exp: 2034-01-13→ Common Stock (175,000 underlying)
Other
Stock Option (right to buy)
2025-11-07+75,000→ 75,000 total
Exercise: $30.78Exp: 2035-09-30→ Class A Common Stock (75,000 underlying)
Other
Stock Option (right to buy)
2025-11-07−75,000→ 0 total
Exercise: $30.78Exp: 2035-09-30→ Common Stock (75,000 underlying)
Other
Stock Option (right to buy)
2025-11-07+175,000→ 175,000 total
Exercise: $11.55Exp: 2034-01-13→ Class A Common Stock (175,000 underlying)

Footnotes (3)

[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.
[F2]The options are subject to a service-based vesting requirement, which shall be satisfied over a four-year period. Twenty-five percent of the options vested on January 8, 2025. The remaining 75% vest and become exercisable in equal monthly installments over the following three years, subject to the Reporting Person's continuous service with the Issuer through each such vesting date.
[F3]The options are subject to a service-based vesting requirement, which shall be satisfied over a four-year period. The options vest and become exercisable in equal monthly installments commencing on September 15, 2025, subject to the Reporting Person's continuous service with the Issuer through each such vesting date.

Documents

1 file