Company: BLLN
Filing Date: 2025-10-17
Form Type: S-1/A
Source: 0001193125-25-242632
Chunk: 279

Company: BillionToOne, Inc.
Filing Date: 2025-10-17
Form: S-1/A
Chunk 279
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 case of Tier 3 Participant, 9 months. |

The terms “Change in Control,” “Involuntary Termination,” and “Termination Without Cause” shall have the meanings ascribed to such terms in the Severance Plan. Equity plans 2025 equity incentive plan Our 2025 plan was adopted by our Board of Directors on October 7, 2025, will be submitted to our stockholders for approval prior to this offering, and became effective upon adoption, although no awards shall be granted under our 2025 Plan until the effectiveness of the registration statement of which this prospectus is a part. Our 2025 Plan is intended to replace our 2018 Plan. However, awards outstanding under the 2018 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 10,034,626 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 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 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