Sakakibara Shan Riku 4

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

Form 4

Period: 2025-11-07

Chief Product Officer

Transactions

Other
Stock Option (right to buy)
2025-11-07+50,000→ 50,000 total
Exercise: $2.80Exp: 2031-06-07→ Class A Common Stock (50,000 underlying)
Other
Common Stock
2025-11-07−220,000→ 0 total
Other
Stock Option (right to buy)
2025-11-07−50,000→ 0 total
Exercise: $2.80Exp: 2031-06-07→ Common Stock (50,000 underlying)
Other
Stock Option (right to buy)
2025-11-07−40,000→ 0 total
Exercise: $8.65Exp: 2033-01-18→ Common Stock (40,000 underlying)
Other
Class A Common Stock
2025-11-07+220,000→ 220,000 total
Other
Stock Option (right to buy)
2025-11-07+40,000→ 40,000 total
Exercise: $8.65Exp: 2033-01-18→ Class A Common Stock (40,000 underlying)
Other
Stock Option (right to buy)
2025-11-07−65,000→ 0 total
Exercise: $30.78Exp: 2035-09-30→ Common Stock (65,000 underlying)
Other
Stock Option (right to buy)
2025-11-07+65,000→ 65,000 total
Exercise: $30.78Exp: 2035-09-30→ Class A Common Stock (65,000 underlying)

Footnotes (4)

[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 fully vested and exercisable.
[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 January 1, 2023, subject to the Reporting Person's continuous service with the Issuer through each such vesting date.
[F4]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