Company: BLLN
Filing Date: 2025-10-07
Form Type: S-1
Source: 0001193125-25-233697
Chunk: 277

Company: BillionToOne, Inc.
Filing Date: 2025-10-07
Form: S-1
Chunk 277
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 exercise price, base price or purchase price, if any, applicable to 
 each outstanding stock award; and                                                                                         |

| • |     | the maximum number and kind of shares by which the share reserve may increase automatically each year. |

In the event that there is a declaration of an extraordinary dividend payable in a form other than our Class A common stock in an amount that has a material effect on the price of our Class A common stock, a recapitalization, a spin-offor a similar occurrence, the compensation committee may make such adjustments to any of the foregoing as it deems appropriate, in its sole discretion. Amendments or termination Our Board of Directors may amend, suspend or terminate our 2025 Plan at any time. If our Board of Directors amends our 2025 Plan, it does not need stockholder approval of the amendment unless required by applicable law, regulation or rules. Our 2025 Plan will terminate automatically 10 years after the later of the date when our Board of Directors adopted our 2025 Plan or approved the latest share increase that was also approved by our stockholders. 2018 stock plan Our Board of Directors adopted and our stockholders approved our 2018 Plan in December 2018. After completion of this offering, no further awards will be made under the 2018 Plan and the outstanding awards will continue to be governed by their existing terms, except that our Class A common stock will be the class of stock underlying the outstanding awards. In addition, we will make adjustments to the number of shares and the exercise price per share underlying outstanding awards to reflect changes made to our capital structure in connection with this offering. This summary, however, is not intended to be a complete description of the 2018 Plan and is qualified in its 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-employeedirectors and consultants and the employees and consultants of our affiliates. Share reserve