Company: BLLN
Filing Date: 2025-10-07
Form Type: S-1
Source: 0001193125-25-233697
Chunk: 271

Company: BillionToOne, Inc.
Filing Date: 2025-10-07
Form: S-1
Chunk 271
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 of the closing date of this offering. 203

Equity compensation

Historically, the equity compensation granted to our named executive officers has consisted of stock options. For a description of the stock options granted to our named
executive officers in fiscal year 2024, please see the “Outstanding equity awards at 2024 fiscal year-end” table below.

Employee benefits and perquisites

Our named executive officers are
eligible to participate in our health and welfare plans to the same extent as are full-time employees generally. We generally do not provide our named executive officers with perquisites or other personal benefits.

Retirement benefits

We have established a 401(k) tax-deferred savings plan, which permits participants, including our named 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

We previously entered into an employment offer letter agreement with each named executive officer that sets forth the initial terms and conditions of the named executive
officer’s employment, including initial base salary, equity grants and employee benefits eligibility. In addition, prior to this offering, our Board of Directors has approved the Severance Plan (as defined below) pursuant to which our named
executive officers will be participants and will each be eligible to receive certain severance and change in control benefits, as described in “—Severance and change in control benefits” below. The Severance Plan will supersede and
replace any existing employment or severance agreement between the Company and our named executive officers.

204

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