Company: BLLN
Filing Date: 2025-09-17
Form Type: DRS/A
Source: 0001193125-25-206347
Chunk: 303

Company: BillionToOne, Inc.
Filing Date: 2025-09-17
Form: DRS/A
Chunk 303
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 sell their Rule 701 shares under Rule 144 without complying with the holding period requirements of Rule 144. All holders of Rule 701 shares, however, are required by that rule to wait until 90 days after the date of this prospectus before selling those shares under Rule 701, subject to the expiration of the lock-upagreements and market stand-offarrangements described below. Form S-8registration statements We intend to file one or more registration statements on Form S-8under the Securities Act with the SEC as soon as practicable after the time at which the registration statement of which this prospectus forms a part becomes effective to register the offer and sale of shares of our Class A common stock that are subject to outstanding stock options and Class A common stock issued or issuable under our employee benefit plans as defined in Form S-8.These registration statements will become effective immediately on filing. Shares covered by these registration statements will then be eligible for sale in the public markets, subject to vesting restrictions, any applicable lock-upagreements and/or market stand-offarrangements described below and Rule 144 limitations applicable to affiliates. Lock-upagreements and market stand-offarrangements We will agree that we will not, subject to certain exceptions, (i) offer, pledge, sell, contract to sell, sell any option or contract to purchase, purchase any option or contract to sell, grant any option, right, or warrant to 225

purchase, hedge, lend, or otherwise transfer or dispose of, directly or indirectly, or submit to, or file with the SEC a registration statement under the Securities Act relating to any shares of
our Class A common stock or securities convertible into or exchangeable or exercisable for any shares of our Class A common stock, or (ii) enter into any swap, hedging or other agreement that transfers, in whole or in part, any of the
economic consequences of ownership of any shares of Class A common stock or any such other securities, or publicly disclose the intention to undertake any of the foregoing (regardless of whether any of these transactions are to be settled by
the delivery of shares of Class A common stock or such other securities, in cash or otherwise), in each case without the prior written consent of J.P. Morgan Securities LLC for a period of 180 days after the date of this prospectus, other than
the shares of our Class A common stock to be sold in this offering and certain other exceptions.

Our directors and executive officers, and substantially all of