Company: BLLN
Filing Date: 2025-06-20
Form Type: DRS
Source: 0000950123-25-006095
Chunk: 149

Company: BillionToOne, Inc.
Filing Date: 2025-06-20
Form: DRS
Chunk 149
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 misstatement of account balances or disclosures that would result in a material misstatement to the annual or interim financial statements that would not be prevented or detected.                                                                       |

| • |     | We did not design and maintain user access controls to ensure appropriate segregation of duties and to adequately restrict 
 user and privileged access to appropriate personnel in creating and posting journal                                        |

112

| entries. This material weakness did not result in a misstatement to the financial statements; however, it could result in a misstatement of account balances or disclosures that would result in a 
 material misstatement to the annual or interim financial statements that would not be prevented or detected.                                                                                       |

We have taken certain measures to remediate the material weaknesses described above, including:

| • |     | consulted with experts on technical accounting matters, internal controls, and in the preparation of our financial 
 statements;                                                                                                        |

| • |     | engaged a third party to assist in evaluating segregation of duties risks and design and implement controls to address 
 those risks;                                                                                                           |

| • |     | began to design and implement controls related to restricting user and privileged access to appropriate personnel, 
 including as it relates to creating and posting journal entries;                                                   |

| • |     | engaged a third party to assist management in evaluating the accounting for financial instruments; and |

| • |     | hired additional accounting, finance, operations, and information technology resources with relevant public company 
 experience, including a Chief Financial Officer, Controller and a Vice President of Information Systems.            |

We will not be able to fully remediate these material weaknesses until these steps have been completed and have been operating effectively for a sufficient period of time. Additionally, as stated above, we have not performed an evaluation of our internal control over financial reporting. Accordingly, we cannot ensure that we have identified all, or that we will not in the future have additional, material weaknesses. While we are aiming to complete these remediation efforts by the end of 2025, these remediation efforts or testing their effectiveness may extend into 2026. Material weaknesses may still exist when we report on the effectiveness of our internal control over financial reporting as required under Section 404 of the Sarbanes-Oxley Act, beginning with our second annual report after the completion of this offering. If we are unable to remediate the material weaknesses or if we identify additional material weaknesses in the future or otherwise fail to develop and maintain effective internal control over financial reporting, we may not be able to accurately or timely report our financial condition or results of