Company: BLLN
Filing Date: 2025-09-17
Form Type: DRS/A
Source: 0001193125-25-206347
Chunk: 276

Company: BillionToOne, Inc.
Filing Date: 2025-09-17
Form: DRS/A
Chunk 276
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 entirety by reference to the complete text of the 2018 Plan, which is filed
as an exhibit to the registration statement of which this prospectus is a part. To the extent there is a conflict between the terms of this summary and the 2018 Plan, the terms of the 2018 Plan will control.

Types of awards

The 2018 Plan provides for the grant of incentive stock
options, or ISOs, nonstatutory stock options, or NSOs, and awards of restricted stock (collectively, stock awards). ISOs may be granted only to our employees, but not employees of our affiliates. All other awards may be granted to our employees, our
non-employee directors and consultants and the employees and consultants of our affiliates.

Share reserve

As of December 31, 2024, we have reserved 10,904,372 shares of our common stock for issuance under the 2018 Plan, all of which may be issued as incentive stock
options. Unissued shares subject to awards that expire or become unexercisable without being exercised in full or are surrendered pursuant to an option exchange program and shares that are forfeited, cancelled, reacquired by us or withheld in
payment of the purchase price or exercise price of an award or in satisfaction of withholding taxes will again become available for issuance under the 2018 Plan or, following completion of this offering, under the 2025 Plan.

Administration

Our Board 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:

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