Company: BLLN
Filing Date: 2025-10-07
Form Type: S-1
Source: 0001193125-25-233697
Chunk: 274

Company: BillionToOne, Inc.
Filing Date: 2025-10-07
Form: S-1
Chunk 274
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 Plan will continue to be governed by their existing terms. It is expected that our 2025 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 6% of the Class A common stock on a fully diluted basis after giving effect to this offering (assuming the conversion of all Class B common stock to Class A common stock, the exercise of any outstanding warrants and the Preferred Stock Conversion and the Reclassification, and including, but not limited to, shares subject to outstanding awards under the 2018 Plan, and the issuance of the Class A common stock contemplated to be sold in this offering, but assuming no exercise by the underwriters of their option to purchase additional 206

shares), plus up to 8,930,919 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 2027 and ending in (and including) 2035, by a number equal to the lesser of:

| • |     | 5% 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. 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-employee directors may not exceed $750,000 in any one fiscal year, provided, however, that such limitation that will not apply in the fiscal