Company: BLLN
Filing Date: 2025-11-05
Form Type: 3
Source: 0001193125-25-267676
Chunk: 1

Company: BillionToOne, Inc.
Filing Date: 2025-11-05
Form: 3
Chunk 1
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 (I) (Instr. 5) | 6. Nature of Indirect Beneficial Ownership (Instr. 5) |     |     |                   |                               |     |     |   |
| Series A-1 Convertible Preferred Stock     |                                                     [F4] | N/A                                                                         | N/A                                                    | N/A                                                      | N/A                                                   | N/A | N/A | [F4] - [F4]       | Common Stock [F4] - 262,434   | N/A | N/A | D |
| Stock Option (right to buy)                |                                                    $2.80 | N/A                                                                         | N/A                                                    | N/A                                                      | N/A                                                   | N/A | N/A | [F5] - 06/07/2031 | Common Stock [F2] - 640,000   | N/A | N/A | D |
| Stock Option (right to buy)                |                                                   $20.04 | N/A                                                                         | N/A                                                    | N/A                                                      | N/A                                                   | N/A | N/A | [F6] - 06/18/2035 | Common Stock [F2] - 1,003,102 | N/A | N/A | D |

Remarks:

Chairman and Chief Executive Officer
Exhibit 24 - Power of Attorney

| ** Signature of Reporting Person          
 /s/ /s/ Thomas P. Lynch, Attorney-in-Fact | Date       
 11/05/2025 |

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