Company: BLLN
Filing Date: 2025-10-17
Form Type: S-1/A
Source: 0001193125-25-242632
Chunk: 281

Company: BillionToOne, Inc.
Filing Date: 2025-10-17
Form: S-1/A
Chunk 281
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 committee but in no event more than ten years after they are granted. These awards generally expire earlier if the participant’s service terminates earlier. Restricted shares and restricted stock units Restricted shares and restricted stock units may be awarded under our 2025 Plan in return for any lawful consideration, and participants who receive restricted shares or stock units generally are not required to pay cash for their awards. In general, these awards will be subject to vesting. Vesting may be based on length of service, the attainment of performance-based milestones or a combination of both, as determined by the compensation committee. Corporate transactions In the event we are a party to a merger, consolidation or certain change in control transactions, outstanding awards granted under our 2025 Plan, and all shares acquired under our 2025 Plan, will be subject to the terms of the definitive transaction agreement (or, if there is no such agreement, as determined by our compensation committee). Unless an award agreement provides otherwise, such treatment may include any of the following with respect to each outstanding award:

| • |     | the continuation, assumption or substitution of an award by a surviving entity or its parent; |

| • |     | the cancellation of an award without payment of any consideration; |

| • |     | the cancellation of the vested portion of an award (and any portion that becomes vested as of the effective time of the                                                                                                                             
 transaction) in exchange for a payment equal to the excess, if any, of the value that the holder of each share of our Class A common stock receives in the transaction over (if applicable) the exercise price otherwise payable in connection with 
 the award; or                                                                                                                                                                                                                                       |

| • |     | the assignment of any reacquisition or repurchase rights held by us in respect of an award of restricted shares to the               
 surviving entity or its parent (with proportionate adjustments made to the price per share to be paid upon exercise of such rights). |

The compensation committee is not required to treat all awards, or portions thereof, in the same manner. The vesting of an outstanding award may be accelerated by the administrator upon the occurrence of a change in control, whether or not the award is to be assumed or replaced in the transaction, or in connection with a termination of service following a change in control transaction. A change in control includes:

| • |     | any person acquiring beneficial ownership of more than 50% of our total voting power; |

| • |     | the sale or other disposition of all or substantially all of our assets; or