Company: BLLN
Filing Date: 2025-08-11
Form Type: DRS/A
Source: 0000950123-25-007483
Chunk: 254

Company: BillionToOne, Inc.
Filing Date: 2025-08-11
Form: DRS/A
Chunk 254
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 Plan will have the features described below. Share reserve The number of shares of our Class A common stock available for issuance under our 2025 Plan will equal the sum of shares plus up to shares remaining available for issuance under, or issued pursuant to or subject to awards granted under, our 2018 Plan. The number of shares reserved for issuance under our 2025 Plan will be increased automatically on the first business day of each of our fiscal years, commencing in 2025 and ending in 2035, by a number equal to the lesser of:

| • |     | % of the shares of Class A common stock outstanding on the last business day of the prior fiscal year; or |

| • |     | the number of shares determined by our Board of Directors. |

In general, to the extent that any awards under our 2025 Plan are forfeited, terminate, expire or lapse without the issuance of shares, or if we repurchase the shares subject to awards granted under our 2025 Plan, those shares will again become available for issuance under our 2025 Plan, as will shares applied to pay the exercise or purchase price of an award or to satisfy tax withholding obligations related to any award. Administration The compensation committee of our Board of Directors will administer our 2025 Plan. The compensation committee will have complete discretion to make all decisions relating to our 2025 Plan and outstanding awards, including repricing outstanding options and modifying outstanding awards in other ways. 196

Eligibility Employees, non-employeedirectors, consultants and advisors will be eligible to participate in our 2025 Plan. Under our 2025 Plan, the aggregate grant date fair value of awards granted to our non-employeedirectors may not exceed $ in any one fiscal year, except that the grant date fair value of awards granted to newly appointed non-employeedirectors may not exceed $ in the fiscal year in which such non-employeedirector is initially appointed to our Board of Directors. Types of awards Our 2025 Plan provides for the following types of awards:

| • |     | incentive and nonstatutory stock options; |

| • |     | stock appreciation rights; |

| • |     | restricted shares; and |

| • |     | restricted stock units. |

Options and stock appreciation rights The exercise price for options granted under our 2025 Plan may not be less than 100% of the fair market value of our Class A common stock on the grant date. Optionees will be permitted