Company: BLLN
Filing Date: 2025-08-11
Form Type: DRS/A
Source: 0000950123-25-007483
Chunk: 30

Company: BillionToOne, Inc.
Filing Date: 2025-08-11
Form: DRS/A
Chunk 30
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 into                            
 an aggregate of   shares of our common stock immediately prior to the completion of this offering (the Preferred Stock Conversion); |

| • |     | the automatic adjustment of the A-6 Warrant into a warrant to purchase 9,660 shares 
 of our common stock immediately prior to the completion of this offering;           |

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| • |     | the filing and effectiveness of our Post-IPO Certificate of Incorporation                                                                                                                                                                          
 immediately prior to the completion of this offering, which, among other things, will reclassify all outstanding shares of our common stock into an equal number of shares of Class A common stock (the Reclassification), and the adoption of our 
 amended and restated bylaws (the Post-IPO Bylaws), which will become effective upon the filing of our Post-IPO Certificate of Incorporation;                                                                                                       |

| • |     | the exchange of an aggregate of   shares of Class A common stock held by our Co-Founders, for an equivalent number of shares of our Class B common stock, to be effected immediately prior to the completion of this offering pursuant to the terms of an exchange agreement entered into with 
 us (the Class B Stock Exchange);                                                                                                                                                                                                                                                               |

| • |     | no exercise, settlement or termination of the outstanding options or warrants described above; and |

| • |     | no exercise by the underwriters of their option to purchase up to   additional shares of our Class A 
 common stock in this offering.                                                                       |

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Summary financial data The following table sets forth our summary statements of operations data for the years ended December 31, 2023 and 2024 and the six months ended June 30, 2024 and 2025, as well as our summary balance sheet data as of June 30, 2025. We derived the summary statements of operations data for the years ended December 31, 2023 and 2024 from our audited financial statements included elsewhere in this prospectus. The summary condensed statements of operations data for the six months ended June 30, 2025 and 2024 and summary balance sheet data as of June 30, 2025 have been derived from our unaudited financial statements included elsewhere in this prospectus. Our historical results are not necessarily indicative of the results that may be expected in the future. When you read this summary financial data, it is important that you read it together with the historical financial statements