Company: BLLN
Filing Date: 2025-08-11
Form Type: DRS/A
Source: 0000950123-25-007483
Chunk: 126

Company: BillionToOne, Inc.
Filing Date: 2025-08-11
Form: DRS/A
Chunk 126
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 assuming that the assumed initial offering price to the public                                                   
 remains the same, and after deducting underwriting discounts and commissions and estimated offering expenses payable by us.                                                                                                     |

The number of shares of our common stock issued and outstanding, pro forma and pro forma as adjusted, in the table above is based on shares of our Class A common stock and shares of our Class B common stock outstanding as of June 30, 2025, after giving effect to the Preferred Stock Conversion, the Reclassification and the Class B Stock Exchange, in each case as if they had occurred on June 30, 2025, and excludes:

| • |     | up to 9,660 shares of our Class A common stock issuable upon the exercise of the 
 A-6 Warrant for an exercise price of $2.5879 per share;                          |

| • |     | up to 80,357 shares of our Class A common stock issuable upon the exercise of the 2021 Common Warrant for an exercise 
 price of $2.80 per share;                                                                                             |

| • |     | up to 41,209 shares of our Class A common stock issuable upon the exercise of the 2022 Common Warrant for an exercise 
 price of $10.92 per share;                                                                                            |

| • |     | shares of our Class A common stock reserved for future issuance under our 2025 Plan, which                                                                                                                                                           
 will become effective upon the effectiveness of the registration statement of which this prospectus forms a part, as well as any future increases in the number of shares of our Class A common stock reserved for issuance under the 2025 Plan; and |

| • |     | shares of our Class A common stock reserved for future issuance under                                                                                                                                                                             
 the ESPP, which will become effective upon the effectiveness of the registration statement of which this prospectus forms a part, as well as any future increases in the number of shares of our Class A common stock reserved for issuance under 
 the ESPP.                                                                                                                                                                                                                                         |

83

Dilution If you invest in our Class A common stock in this offering, your ownership interest will be diluted to the extent of the difference between the initial public offering price per share of our Class A common stock and the pro forma as adjusted net tangible book value per share of our Class A common stock immediately after this offering. Our historical net tangible book value (deficit) as of June 30, 2025 was $ million, or $ per share. Our