Company: BLLN
Filing Date: 2025-10-07
Form Type: S-1
Source: 0001193125-25-233697
Chunk: 284

Company: BillionToOne, Inc.
Filing Date: 2025-10-07
Form: S-1
Chunk 284
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 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, (ii) Adams Street 2020 Direct                          
 Growth Equity Fund LP, (iii) Adams Street 2021 Direct Growth Equity Fund LP, (iv) Adams Street 2022 Direct Growth Equity Fund LP, (v) Adams Street Private Equity Navigator Fund 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) |     | Libertus Capital holds greater than 5% of our capital stock. Entities affiliated with Libertus Capital that purchased convertible promissory notes in our 2022 Note Financing include: (i) Libertus Capital I and 
 (ii) Libertus Capital II.                                                                                                                                                                                         |

Series C redeemable convertible preferred stock financing From March through September 2022, we issued and sold an aggregate of 5,628,825 shares of our Series C redeemable convertible preferred stock at a cash purchase price of $25.4937 per share for an aggregate purchase price of approximately $143.5 million. Each share of Series C redeemable 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. The following table summarizes purchases of our Series C redeemable convertible preferred stock by entities affiliated with certain of our directors and holders of more than 5% of our capital stock.

| Purchaser                                     |     | Series C redeemable convertible preferred 
 stock                                     
 Number of shares                          |           |     | Aggregate purchase price |               |