Company: BLLN
Filing Date: 2025-06-20
Form Type: DRS
Source: 0000950123-25-006095
Chunk: 284

Company: BillionToOne, Inc.
Filing Date: 2025-06-20
Form: DRS
Chunk 284
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 practicable after they are electronically filed with, or furnished to, the SEC. However, the information contained in
or accessible through our website is not part of this prospectus or the registration statement of which this prospectus forms a part.

222

Index to financial statements

| BILLIONTOONE, INC. AUDITED FINANCIAL STATEMENTS AS OF AND FOR THE YEARS ENDED DECEMBER 31, 
 2024 AND 2023                                                                              |     |     |
|:-------------------------------------------------------------------------------------------|:----|:----|
| Report of Independent Registered Public Accounting Firm                                    |     | F-2 |
| Balance Sheets                                                                             |     | F-3 |
| Statements of Operations and Comprehensive Loss                                            |     | F-4 |
| Statements of Redeemable Convertible Preferred Stock and Stockholders’                     
 Deficit                                                                                    |     | F-5 |
| Statements of Cash Flows                                                                   |     | F-6 |
| Notes to Financial Statements                                                              |     | F-8 |

F-1

Report of Independent Registered Public Accounting Firm

To theBoard of Directors and Stockholders of BillionToOne, Inc.

Opinion on the Financial Statements

We have audited the
accompanying 2024 financial statements of BillionToOne, Inc. and the 2023 consolidated financial statements of BillionToOne, Inc. and its subsidiary (collectively referred to as “the Company”), which comprise the balance sheets as of
December 31, 2024 and 2023, and the related statements of operations and comprehensive loss, of redeemable convertible preferred stock and stockholders’ deficit and of cash flows for the years then ended, including the related notes
(collectively referred to as the “financial statements”). In our opinion, the financial statements present fairly, in all material respects, the financial position of the Company as of December 31, 2024 and 2023, and the results of
its operations and its cash flows for the years then ended in conformity with accounting principles generally accepted in the United States of America.

Basis for Opinion

These financial statements are the
responsibility of the Company’s management. Our responsibility is to express an opinion on the Company’sfinancial statements based on our audits. We are a public accounting firm registered with the Public Company Accounting
Oversight Board (United States) (PCAOB) and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and