Company: BLLN
Filing Date: 2025-08-11
Form Type: DRS/A
Source: 0000950123-25-007483
Chunk: 262

Company: BillionToOne, Inc.
Filing Date: 2025-08-11
Form: DRS/A
Chunk 262
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 (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. 203

The following table summarizes purchases of our convertible promissory notes in the 2022 Note Financing by entities affiliated with certain of our directors and holders of more than 5% of our capital stock.

| Purchaser                                    |     | Aggregate principal amount of convertible 
 promissory notes                          |            |
|:---------------------------------------------|:----|:------------------------------------------|-----------:|
| Entities affiliated with Adams Street        
 Partners(1)                                  |     | $                                         |  3,000,000 |
| Entities affiliated with Libertus Capital(2) |     | $                                         | 15,000,000 |

| (1) |     | Entities affiliated with Adams Street Partners that purchased convertible promissory notes in our 2022 Note Financing include: (i) Adams Street 2019 Direct Growth Equity Fund LP,