Company: BLLN
Filing Date: 2025-06-20
Form Type: DRS
Source: 0000950123-25-006095
Chunk: 228

Company: BillionToOne, Inc.
Filing Date: 2025-06-20
Form: DRS
Chunk 228
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 of Directors, or a committee thereof, has
administered the 2018 Plan since its adoption; however, following this offering, the compensation committee of our Board of Directors will generally administer the 2018 Plan. The administrator has complete discretion to make all decisions relating
to the 2018 Plan and outstanding awards.

Eligibility

Our employees, non-employee members of our Board of Directors and consultants, including those of our affiliates, are eligible to participate in the 2018 Plan. However, only our direct employees are eligible to receive
incentive stock options.

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Options The exercise price for options granted under the 2018 Plan is determined by the administrator, but, in the case of ISOs, may not be less than 100% of the fair market value of our common stock on the grant date. Optionees may pay the exercise price in cash or cash equivalents or by one, or any combination of, the following forms of payment, as permitted by the administrator in its sole discretion:

| • |     | Delivery of a promissory note, with the recourse, interest, security and redemption provisions determined by the 
 administrator to the extent permitted under and in accordance with applicable law;                               |

| • |     | Cancellation of indebtedness; |

| • |     | Surrender of shares of common stock that the optionee already owns; or |

| • |     | If our shares of common stock are publicly traded, through a sale of shares subject to the option through a securities 
 broker; or Other methods permitted under applicable laws.                                                              |

Options vest as determined by the administrator. In general, we have granted options that vest over a four-year period. Options expire at the time determined by the administrator, but in no event more than ten years after they are granted, and generally expire earlier if the optionee’s service terminates. Restricted shares Restricted shares may be awarded or sold under the 2018 Plan in return for cash or cash equivalents or, as permitted by the administrator in its sole discretion, in exchange for services rendered to us, or through any other means permitted by applicable law. Restricted shares vest as determined by the administrator. The plan administrator determines the terms and conditions of restricted shares, including vesting and forfeiture terms. If a participant’s service relationship with us ceases for any reason, we may receive any or all of the shares of common stock held by the participant that have not vested as of the date the participant terminates service with us through a forfeiture condition or a rep