Company: BLLN
Filing Date: 2025-10-07
Form Type: S-1
Source: 0001193125-25-233697
Chunk: 283

Company: BillionToOne, Inc.
Filing Date: 2025-10-07
Form: S-1
Chunk 283
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 LLC (f/k/a Adams Street Global Private Markets 
 Fund LP), (vi) Adams Street Growth Equity Fund VII LP, and (vii) FCPR GF—Lumyna Private Equity World Fund. Thomas Bremner, a member of our Board of Directors, is a partner at Adams Street Partners.                                  |

| (2) |     | Entities affiliated with Hummingbird Ventures that purchased shares of Series C redeemable convertible preferred stock include Hummingbird Dragons CommV. Firat Ileri, a member of our Board of Directors, is the managing 
 partner of Hummingbird Ventures.                                                                                                                                                                                           |

| (3) |     | Entities affiliated with Libertus Capital that purchased shares of our Series C redeemable convertible preferred stock include: (i) Libertus Capital I, and (ii) Libertus Capital II. Libertus holds greater than 
 5% of our capital stock.                                                                                                                                                                                          |

| (4) |     | Entities and individuals affiliated with Premji Invest that purchased shares of our Series D redeemable convertible preferred stock include: (i) Akshay Rai, (ii) Directed Trust Company FBO Eric Tong Roth IRA,           
 (iii) Eric Aisi Tong, (iv) Andrew Chang, (v) Wipro Enterprises Private Limited, (vi) T.K. Kurien, (vii) Sandesh Kaveripatnam, and (viii) Vedant Agrawal. Akshay Rai, a member of our Board of Directors, is Vice President 
 of Healthcare & Biotechnology Investments at Premji Invest.                                                                                                                                                                |

2022 convertible note financing In September 2022, we entered into convertible promissory note agreements whereby we sold and issued convertible promissory notes in an aggregate principal amount of $30.0 million (the 2022 Note Financing). Each convertible promissory note had an interest rate of 8% per annum. The aggregate principal and accrued interest converted into 1,726,823 shares of our Series C-1redeemable convertible preferred stock at a conversion price of $19.6143 per share upon the closing of our Series D financing in May 2024, and the rights and obligations under the convertible promissory note agreements were terminated and canceled. Each share of Series C-1redeemable convertible preferred stock will convert automatically into a share of our Class A common stock, on a one-for-one basis, immediately prior to the completion of this offering. 214

The following table summarizes purchases of our