Company: BLLN
Filing Date: 2025-10-17
Form Type: S-1/A
Source: 0001193125-25-242632
Chunk: 411

Company: BillionToOne, Inc.
Filing Date: 2025-10-17
Form: S-1/A
Chunk 411
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     |   |          |   |
| Weighted-average shares used in calculating net loss per share, basic and diluted |     |   |   10,020 |   |     |   |   10,349 |   |
| Net loss per share, basic and diluted                                             |     | $ |    (1.52 | ) |     | $ |    (0.41 | ) |

Since the Company was in a loss position for the period presented, basic net loss per share is the same as diluted net loss per share as the inclusion of all potential common shares outstanding would have been anti-dilutive. F-61

BILLIONTOONE, INC. Notes to Unaudited Interim Financial Statements Potentially dilutive securities that were not included in the diluted per share calculations because they would be anti-dilutive were as follows for the six months ended June 30, 2024 and 2025:

|                                                             |     |     |   June 30, 
       2024 |     |     |   June 30, 
       2025 |
|:------------------------------------------------------------|:----|:----|-----------:|:----|:----|-----------:|
| Redeemable convertible preferred stock                      |     |     | 29,084,235 |     |     | 29,084,235 |
| Outstanding stock options                                   |     |     |  6,542,526 |     |     |  8,933,419 |
| Restricted stock awards in exchange for non recourse note   |     |     |    700,000 |     |     |    700,000 |
| Warrants to purchase common stock                           |     |     |    121,566 |     |     |    121,566 |
| Warrants to purchase redeemable convertible preferred stock |     |     |      9,660 |     |     |      9,660 |
| Unvested early-exercised options                            |     |     |      2,188 |     |     |          - |

(15) Subsequent Events Management evaluates events occurring subsequent to the date of the financial statements in determining the accounting for and disclosure of transactions and events that affect the financial statements. For its interim financial statements as of June 30, 2025, the Company evaluated subsequent events through September 17, 2025, the date on which the interim financial statements were available to be issued. F-62

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