Company: BLLN
Filing Date: 2025-09-17
Form Type: DRS/A
Source: 0001193125-25-206347
Chunk: 384

Company: BillionToOne, Inc.
Filing Date: 2025-09-17
Form: DRS/A
Chunk 384
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        |     |   |             - | % |     |   |             - | % |

The significant assumptions used in preparing the option pricing model for valuing the redeemable convertible preferred stock warrant liability as of December 31, 2024 and June 30, 2025, are as follows:

|                       |     |   | December 31, 
         2024 |   |     |   | June 30, 
     2025 |   |
|:----------------------|:----|:--|-------------:|:--|:----|:--|---------:|:--|
| Stock price           |     | $ |        25.83 |   |     | $ |    27.94 |   |
| Exercise price        |     | $ |         2.59 |   |     | $ |     2.59 |   |
| Volatility            |     |   |         84.0 | % |     |   |     83.2 | % |
| Expected term (years) |     |   |          2.3 |   |     |   |      1.8 |   |
| Risk-free rate        |     |   |         4.14 | % |     |   |     3.71 | % |
| Dividend yield        |     |   |            - | % |     |   |        - | % |

The fair value of the convertible notes is measured based on the present value of the notes based on the fair market yield to maturity and an estimate of the probability of the notes’ conversion features. The fair market yield was estimated based on publicly traded debt securities with similar maturities and risk. During the six months ended June 30, 2024, the Company settled the convertible notes through the issuance of Series C-1redeemable convertible preferred stock to the noteholders (See Note 8). F-49

BILLIONTOONE, INC. Notes to Unaudited Interim Financial Statements The significant assumptions used in preparing discounted cash flow for valuing the convertible notes as of right before the conversion date May 15, 2024, are as follows:

|                                   |     | May 15, 
 2024    |        |   |
|:----------------------------------|:----|:--------|-------:|:--|
| Principal outstanding (in $’000s) |     |         | 30,000 |