Company: BLLN
Filing Date: 2025-06-20
Form Type: DRS
Source: 0000950123-25-006095
Chunk: 229

Company: BillionToOne, Inc.
Filing Date: 2025-06-20
Form: DRS
Chunk 229
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urchase right. Corporate transactions In the event that we are a party to a merger, consolidation or the capital reorganization or business combination transaction, including any transaction or series of transaction in which any person becomes the beneficial owner of more than 50% of our then outstanding capital stock, or in the event of a sale of all or substantially all of our assets, awards granted under the 2018 Plan will be treated in the manner determined by the administrator. Such treatment may include, without limitation, one or more of the following with respect to outstanding awards:

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

| • |     | Cancellation of the award in exchange for a payment equal to the excess, if any, of the value of the shares subject to the 
 award over any exercise price per share applicable to the award; or                                                        |

| • |     | Cancellation of the award without payment of any consideration. |

The administrator is not obligated to treat all awards in the same manner. Changes in capitalization In the event of certain specified changes in the capital structure of our common stock, such as a stock split, reverse stock split, stock dividend, combination, consolidation, or reclassification or our shares of common 182

stock, proportionate adjustments will automatically be made in (i) each of the number and kind of shares available for future grants under the 2018 Plan, (ii) the number and kind of shares covered by each outstanding option and all restricted shares, (iii) the exercise price per share subject to each outstanding option and (iv) any repurchase price applicable to shares granted under the 2018 Plan. In the event of any increase or decrease in the number of issued shares without the receipt of consideration by the Company, an extraordinary cash dividend that has a material effect on the fair market value of our common stock, a recapitalization, a rights offering, a reorganization, merger, spin-off, split-up,change in corporate structure or other similar occurrence, the administrator shall make adjustments, in its sole discretion, to one or more of the items described above. Transferability A participant generally may not transfer stock awards under our 2018 Plan other than by will, the laws of descent and distribution, or as otherwise provided under our 2018 Plan. Amendments or termination Our Board of Directors may amend or terminate our 2018 Plan at any time, but no amendment or termination shall be made that would materially and adversely affect the rights