Company: BLLN
Filing Date: 2025-09-17
Form Type: DRS/A
Source: 0001193125-25-206347
Chunk: 387

Company: BillionToOne, Inc.
Filing Date: 2025-09-17
Form: DRS/A
Chunk 387
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 Series A-6 |     |            |  5,805,861 |     |               |  5,796,201 |     |              |  14,999 |     |             |  15,000 |
| Series B-1 |     |            |  5,182,287 |     |               |  5,182,287 |     |              |  54,889 |     |             |  55,000 |
| Series B-2 |     |            |  2,566,902 |     |               |  2,566,902 |     |              |  27,243 |     |             |  16,025 |
| Series C   |     |            |  6,079,919 |     |               |  5,628,825 |     |              | 143,268 |     |             | 143,500 |
| Series C-1 |     |            |  1,726,823 |     |               |  1,726,823 |     |              |  39,886 |     |             |  33,870 |
| Series D   |     |            |  4,656,233 |     |               |  4,656,233 |     |              | 129,996 |     |             | 156,563 |
| Total      |     |            | 29,544,989 |     |               | 29,084,235 |     | $            | 419,409 |     | $           | 422,458 |

The rights, preferences and privileges of the Company’s redeemable convertible preferred stock are as follows: (i)

| (i) | Dividends |

The holders of shares of redeemable convertible preferred stock shall be entitled to receive dividends prior and in preference to any declaration of dividends on common stock. Dividends are payable only when and if declared by the Company’s Board of Directors and are not cumulative. After dividends paid on redeemable convertible preferred stock, any dividends or distribution should be distributed to the holders of common and redeemable convertible preferred stock on an as-convertedbasis. No dividends have been declared or paid through June 30, 2025. F-52

BILLIONTOONE, INC. Notes to Unaudited Interim Financial Statements

| (ii) | Liquidation Preference |

In the event of liquidation as approved by the