Company: BLLN
Filing Date: 2025-09-17
Form Type: DRS/A
Source: 0001193125-25-206347
Chunk: 313

Company: BillionToOne, Inc.
Filing Date: 2025-09-17
Form: DRS/A
Chunk 313
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 with the underwriters. Subject to the terms and conditions of the underwriting agreement, we have agreed to sell to the underwriters, and each underwriter has severally agreed to purchase, at the public offering price less the underwriting discounts and commissions set forth on the cover page of this prospectus, the number of shares of Class A common stock listed next to its name in the following table:

| Name                                     |     | Number of shares |
| J.P. Morgan Securities LLC               |     |                  |
| Piper Sandler & Co.                      |     |                  |
| Jefferies LLC                            |     |                  |
| William Blair & Company, L.L.C.          |     |                  |
| Stifel, Nicolaus & Company, Incorporated |     |                  |
| Wells Fargo Securities, LLC              |     |                  |
| BTIG, LLC                                |     |                  |
| Total                                    |     |                  |

The underwriters are committed to purchase all the shares of Class A common stock offered by us if they purchase any shares. The underwriting agreement also provides that if an underwriter defaults, the purchase commitments of non-defaultingunderwriters may also be increased or the offering may be terminated. The underwriters propose to offer the shares of Class A common stock directly to the public at the initial public offering price set forth on the cover page of this prospectus and to certain dealers at that price less a concession not in excess of $ per share. After the initial offering of the shares to the public, if all of the shares of Class A common stock are not sold at the initial public offering price, the underwriters may change the offering price and the other selling terms. Sales of any shares made outside of the United States may be made by affiliates of the underwriters. The underwriters have an option to buy up to additional shares of Class A common stock from us to cover sales of shares by the underwriters which exceed the number of shares specified in the table above. The underwriters have 30 days from the date of this prospectus to exercise this option to purchase additional shares. If any shares are purchased with this option to purchase additional shares, the underwriters will purchase shares in approximately the same proportion as shown in the table above. If any additional shares of Class A common stock are purchased, the underwriters will offer the additional shares on the same terms as those on which the shares are being offered. The underwriting fee is equal to the public offering price per share of Class A common stock less the amount