Company: BLLN
Filing Date: 2025-08-11
Form Type: DRS/A
Source: 0000950123-25-007483
Chunk: 102

Company: BillionToOne, Inc.
Filing Date: 2025-08-11
Form: DRS/A
Chunk 102
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 outstanding common stock warrants. Additionally, we did not design and 
 maintain controls to appropriately present and disclose amounts related to debt instruments. These material weaknesses resulted in immaterial adjustments to the financial statements. Additionally, these material weaknesses 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 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 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.                                                                                                     |

To date, we have taken the following steps to begin to remediate these material weaknesses:

| • |     | 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.            |

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While management has made improvements to our control environment and business processes to support and scale with our growing operations, the identified material weaknesses remain un-remediated.We expect our remediation efforts to continue to take place in 2025, and to include the following:

| • |     | continue to consult with experts to complete our assessment of segregation of duties risks and implement processes and                                                           
 controls to address, manage and monitor those risks and our restriction of user access, including enhancing the usage of technology within our systems, applications, and tools; |

| • |     | continue to engage additional experts, as needed, to consult on future complex accounting matters; and |

| • |     | continue to expand our resources with the appropriate level of expertise within our accounting, finance