Company: BLLN
Filing Date: 2025-10-17
Form Type: S-1/A
Source: 0001193125-25-242632
Chunk: 122

Company: BillionToOne, Inc.
Filing Date: 2025-10-17
Form: S-1/A
Chunk 122
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 of us, even if a change of control would be beneficial to our existing stockholders. In addition, our Post-IPO Certificate of Incorporation and Post-IPO Bylaws will contain provisions that could have the effect of rendering more difficult, delaying or preventing an acquisition
deemed

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undesirable by our Board of Directors, including transactions in which stockholders might otherwise receive a premium for their shares. Among others, our Post-IPOCertificate of Incorporation and Post-IPOBylaws will include the following provisions:

| • |     | the dual-class structure that provides holders of shares of our Class B common stock with the ability to significantly                                               
 influence the outcome of matters requiring stockholder approval, even if they own significantly less than a majority of the shares of our outstanding capital stock; |

| • |     | the delegation to our Board of Directors of the exclusive right to expand the size of our Board of Directors and to elect                                                                                  
 directors to fill a vacancy created by any such expansion or the resignation, death or removal of a director, which will prevent stockholders from being able to fill vacancies on our Board of Directors; |

| • |     | the division of our Board of Directors into three classes, with each class serving staggered three-year terms, which may 
 delay the ability of stockholders to change the membership of a majority of our Board of Directors;                      |

| • |     | limitations on convening special stockholder meetings once our Class B common stock no longer represents a majority of                 
 voting power of our outstanding capital stock, which could make it difficult for our stockholders to adopt desired governance changes; |

| • |     | advance notice procedures, which apply for stockholders to nominate candidates for election as directors or to bring                                                                                                                           
 matters before an annual meeting of stockholders, which may discourage or deter a potential acquirer from conducting a solicitation of proxies to elect the acquirer’s own slate of directors or otherwise attempting to obtain control of our 
 company;                                                                                                                                                                                                                                       |

| • |     | a prohibition on stockholder action by written consent once our Class B common stock no longer represents a majority                               
 of voting power of our outstanding capital stock, which means that our stockholders will only be able to take action at a meeting of stockholders; |

| • |     | no authorization of cumulative voting, which limits the ability of minority stockholders to elect director candidates; |

| • |     | once our Class B common stock no longer represents a majority of voting power of our outstanding capital