Company: BLLN
Filing Date: 2025-10-07
Form Type: S-1
Source: 0001193125-25-233697
Chunk: 31

Company: BillionToOne, Inc.
Filing Date: 2025-10-07
Form: S-1
Chunk 31
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 requirements available to emerging growth companies. As a result of the accounting standards election, we will not be subject to the same
implementation timing for new or revised accounting standards as other public companies that are not emerging growth companies, which may make comparison of our financials to those of other public companies more difficult. In addition, the
information that we provide in this prospectus may be different than the information you may receive from other public companies in which you hold equity interests. Further, it is possible that some investors will find our Class A common stock less
attractive as a result of these elections, which may result in a less active trading market for our Class A common stock and higher volatility in our stock price.

14

The offering

| Class A common stock offered by us | shares. |

| Option to purchase additional shares | We have granted the underwriters an option to purchase up to   additional shares of Class A common stock from us at any time within 30 days from the date of this prospectus. |

| Class A common stock to be outstanding immediately after this offering | shares (or   shares if the underwriters exercise their option to purchase additional shares of Class A common stock in full). |

| Class B common stock to be outstanding immediately after this offering | shares. |

| Total Class A and Class B common stock to be outstanding immediately after this offering | shares (or   shares if the underwriters exercise their option to purchase additional shares of Class A common stock in full). |

| Use of proceeds | We estimate the net proceeds from the sale of shares of our Class A common stock this offering will be approximately $   million, or $   million if the underwriters exercise                                                      
 their option to purchase additional shares of Class A common stock in full, assuming an initial public offering price of $   per share, which is the midpoint of the estimated offering price range set forth on the cover page of 
 this prospectus, and after deducting the underwriting discounts and commissions and estimated offering expenses payable by us.                                                                                                     |

| We currently intend to use the net proceeds from this offering, together with our existing cash and cash equivalents, for working capital and other general corporate purposes, including to fund our growth, research and 
 development initiatives, technology development, working capital, and operating expenses. See the section titled “Use of proceeds” for additional information.                                                             |

| Voting rights