Company: BLLN
Filing Date: 2025-09-17
Form Type: DRS/A
Source: 0001193125-25-206347
Chunk: 272

Company: BillionToOne, Inc.
Filing Date: 2025-09-17
Form: DRS/A
Chunk 272
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 severance benefits in the event that their employment is terminated by us without Cause (as defined below) or if they resign for Good Reason (as defined below) (either of which, a Qualifying Termination):

| • |     | An amount equal to    months of base salary; |

| • |     | Reimbursement for continued benefit coverage pursuant to COBRA, equal in length for up to the number of months of the 
 officer’s severance benefit; and                                                                                      |

| • |     | If such termination is    months prior to or within    months after a                       
 change in control then the vesting of all then-unvested option shares shall be accelerated. |

Equity plans 2025 equity incentive plan Our Board of Directors intends to adopt and approve our 2025 Equity Incentive Plan (the 2025 Plan), prior to this offering and it will be submitted to our stockholders for approval. We expect that the 2025 Plan will become effective upon 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 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