Company: BLLN
Filing Date: 2025-09-17
Form Type: DRS/A
Source: 0001193125-25-206347
Chunk: 271

Company: BillionToOne, Inc.
Filing Date: 2025-09-17
Form: DRS/A
Chunk 271
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 executive officers, to make contributions by salary deduction pursuant to Section 401(k) of the Internal Revenue Code. Our named executive officers are eligible to participate in the 401(k) plan on the same terms as other full-time employees, including a 100% company matching contribution of the first 3% of an employee’s contribution, and then 50% of the next 2% of an employee’s contribution. Employment arrangements with named executive officers Our named executive officers have not previously entered into written employment agreements with us. We intend to enter into confirmatory employment letters with each of our named executive officers which will become effective upon the completion of this offering and will set forth the continuing terms of their employment. We intend that the written employment agreements with each of our named executive officers will cross-reference our Executive Severance and Change in Control Plan, pursuant to which they will each be eligible to receive certain severance and change in control benefits, as described in “Severance and Change in Control Benefits” below. Outstanding equity awards at 2024 fiscal year-end The following table sets forth information regarding each unexercised option held by each of our named executive officers as of December 31, 2024. The vesting schedule applicable to each outstanding award is described in the footnotes to the table below. Unless otherwise noted, all of the outstanding equity awards reported in the following table were granted under our 2018 Plan.

| Name              |     | Number of   
 securities  
 underlying  
 unexercised 
 options     
 exercisable 
 (#)         |         |     | Number of     
 securities    
 underlying    
 unexercised   
 options       
 unexercisable 
 (#)           |         |    |     | Option   
 exercise 
 price    
 ($)      |       |     | Option     
 expiration 
 date       |            |
| Oguzhan Atay, PhD |     |             | 640,000 |     |               |       — |    |     |          |  2.80 |     |            | 06/07/2031 |
| Ross Taylor       |     |             |       — |     |               | 175,000 | -1 |     |          | 11.55 |     |            | 01/13/2034 |
| Nancy Johnson     |     |             |     833 |     |               |  19,167 | -2 |     |          | 17.12 |     |            | 10/16/2034 |
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