Company: BLLN
Filing Date: 2025-09-17
Form Type: DRS/A
Source: 0001193125-25-206347
Chunk: 284

Company: BillionToOne, Inc.
Filing Date: 2025-09-17
Form: DRS/A
Chunk 284
---
750 shares of our common stock for $1,182,655.00 aggregate cash proceeds at a price of $22.42 per share, which included 9,500 shares purchased from John ten Bosch, our Senior Vice President of Laboratory Operations.

Directed share program

At our request, the underwriters have reserved up to
approximately shares of Class A common stock being offered by this prospectus for sale, at the initial public offering price, to our officers, directors and employees through a directed share program. The directed share program will
not limit the ability of our directors, officers or holders of more than 5% of our capital stock, to purchase more than $120,000 in value of our Class A common stock. We do not currently know the extent to which these related persons will
participate in our directed share program, if at all, or the extent to which they will purchase more than $120,000 in value of our Class A common stock.

Investors’ rights agreement

We have entered into an Amended and
Restated Investors’ Rights Agreement, dated May 14, 2024, by and among the Company and the investors listed on schedule A thereto (the IRA), including entities with which certain of our directors are affiliated. These stockholders are
entitled to rights with respect to the registration of their shares following this offering. For a description of these registration rights, see the section titled “Description of capital stock—Registration rights.” Other than
these registration rights, all other terms of the IRA will terminate in connection with this offering.

Voting agreement

We have entered into an Amended and Restated Voting Agreement by and between the Company and certain holders of our redeemable convertible preferred stock, dated
May 14, 2024 (the Voting Agreement), including entities with which certain of our directors are affiliated. Under the Voting Agreement, certain holders of our capital stock have agreed as to the manner in which they will vote their shares of
our capital stock on certain matters, including with respect to the election of directors. The Voting Agreement will terminate upon the completion of this offering, at which time there will be no further contractual obligations regarding the manner
in which shares are voted with respect to the election of our directors.

211

Right of first refusal and co-saleagreement We have entered into an Amended and Restated Right of First Refusal and Co-SaleAgreement by and between the Company and certain holders of our redeemable convertible preferred stock, dated May 14,