Company: BLLN
Filing Date: 2025-10-17
Form Type: S-1/A
Source: 0001193125-25-242632
Chunk: 276

Company: BillionToOne, Inc.
Filing Date: 2025-10-17
Form: S-1/A
Chunk 276
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 discretionary annual incentive bonus, subject to their continued employment through the date that bonuses are paid. Our Board of Directors has approved an increase of each named executive officer’s base salary to $700,000 for Dr. Atay, $500,000 for Mr. Taylor and $400,000 for Ms. Johnson, and set the target amount of each named executive officer’s annual incentive bonus opportunity to an amount equal to 100% for Dr. Atay, 50% for Mr. Taylor and 30% for Ms. Johnson, in each case effective as 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 rights to severance or change in control benefits under any existing employment or severance agreement between the Company and our named executive officers.

204

Outstanding equity awards at