Company: BLLN
Filing Date: 2025-08-11
Form Type: DRS/A
Source: 0000950123-25-007483
Chunk: 101

Company: BillionToOne, Inc.
Filing Date: 2025-08-11
Form: DRS/A
Chunk 101
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 our financial statements and in the reports that we will file or submit under the Exchange Act is recorded, processed, summarized, and reported within the time
periods specified in the SEC’S rules and forms, and information required to be disclosed in reports filed or submitted under the Exchange Act is accumulated and communicated to our principal executive and financial officers as appropriate to
allow timely decisions regarding required disclosure. In order to maintain and improve the effectiveness of our controls and procedures, we have expended, and anticipate that we will continue to expend, significant resources, including
accounting-related costs and significant management oversight.

As a public company, we will be required to evaluate and determine the effectiveness of internal
control over financial reporting. Beginning with our second annual report following this offering, we will be required to provide a management report on internal control over financial reporting, and our independent registered public accounting firm
may be required to formally attest to the effectiveness of our internal control over financial reporting once we are no longer an “emerging growth company”. Neither we nor our independent

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registered public accounting firm were required to, and therefore did not, perform an evaluation of the effectiveness of our internal control over financial reporting as of or for any period included in our financial statements, nor any period subsequent in accordance with the provisions of the Sarbanes-Oxley Act. However, in connection with the preparation of our financial statements, we identified material weaknesses in our internal control over financial reporting. A material weakness is a deficiency, or a combination of deficiencies, in internal control over financial reporting such that there is a reasonable possibility that a material misstatement of our annual or interim financial statements will not be prevented or detected on a timely basis. The material weaknesses identified pertained to:

| • |     | We did not design and maintain an effective control environment commensurate with our financial reporting requirements.                                                                                                                              
 Specifically, we lack a sufficient complement of resources with the appropriate knowledge, experience, and training to appropriately analyze, record and disclose accounting matters commensurate with our accounting and reporting requirements.    
 Additionally, the lack of sufficient resources resulted in an inability to consistently establish appropriate segregation of duties in our finance and accounting functions. This material weakness contributed to the following additional material 
 weaknesses:                                                                                                                                                                                                                                          |

| • |     | We did not design and maintain effective controls to appropriately analyze, account for, and present and disclose amounts                                                                                                                                 
 related to certain financial instruments. Specifically, we did not design and maintain controls to appropriately analyze, account for, and present and disclose amounts related to