Company: BLLN
Filing Date: 2025-06-20
Form Type: DRS
Source: 0000950123-25-006095
Chunk: 231

Company: BillionToOne, Inc.
Filing Date: 2025-06-20
Form: DRS
Chunk 231
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 offering and will end on , with the first purchase date occurring on .

Amount of contributions

Our ESPP will permit each eligible employee to
purchase Class A common stock through payroll deductions. Each employee’s payroll deductions may not exceed 15% of the employee’s cash compensation. Each participant may purchase up to the number of shares determined by our Board of
Directors on any purchase date, not to exceed 1,500 shares. The value of the shares purchased in any calendar year may not exceed $25,000. Participants may withdraw their contributions at any time before stock is purchased.

Purchase price

The price of each share of Class A common stock
purchased under our ESPP will not be less than 85% of the lower of the fair market value per share of Class A common stock on the first day of the applicable offering period (or, in the case of the first offering period, the price at which one
share of Class A common stock is offered to the public in this offering) or the fair market value per share of Class A common stock on the purchase date.

Other provisions

Employees may end their participation in our ESPP at any
time. Participation ends automatically upon termination of employment with us. If we experience a change in control, our ESPP will end and shares will be purchased with the payroll deductions accumulated to date by participating employees. Our Board
of Directors or our compensation committee may amend or terminate our ESPP at any time.

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Certain relationships and related party transactions The following is a description of transactions since January 1, 2022, or currently proposed, to which we have been or will be a participant, in which the amount involved exceeded $120,000 and in which any of our executive officers, directors or beneficial holders of more than 5% of our capital stock (or any immediate family member of, or person sharing the household with, any of these individuals or entities), which we collectively refer to as a related party, had or will have a direct or indirect material interest, other than compensation arrangements for our directors and executive officers, which are disclosed elsewhere in this prospectus. Series D redeemable convertible preferred stock financing In May 2024, we issued and sold an aggregate of 4,656,233 shares of our Series D redeemable convertible preferred stock at a cash purchase price of $28.0204 per share for an aggregate purchase price of $130.5 million (the Series D Financing). Each share of Series D redeemable convertible preferred stock will convert automatically into