Company: BLLN
Filing Date: 2025-10-17
Form Type: S-1/A
Source: 0001193125-25-242632
Chunk: 385

Company: BillionToOne, Inc.
Filing Date: 2025-10-17
Form: S-1/A
Chunk 385
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 related party transactions during the year ended December 31, 2023 and 2024.

| (15) | Net Loss Per Share Attributable to Shareholders |

The Company applies the two-classmethod when computing net loss per share attributable to common shareholders when shares meet the definition of participating securities. The two-classmethod determines net income (loss) per share of common stock and participating securities according to dividends declared or accumulated and participation rights in undistributed earnings. The two-classmethod requires net income (loss) available to common stockholders for the period to be allocated between common stock and participating securities based upon their respective rights to receive dividends as if all income (loss) for the period had been distributed. The holders of the Company’s redeemable convertible preferred stock would be entitled to dividends F-37

B ILLIONT OO NE, INC. Notes to Financial Statements in preference to common stockholders, if declared. Such dividends are not cumulative. Any remaining earnings would be distributed among the holders of redeemable convertible preferred stock and common stock pro rata on an as-convertedbasis. The holders of the Company’s redeemable convertible preferred stock are not contractually obligated to participate in the Company’s losses. Basic net loss per share is computed by dividing the net loss attributable to common stockholders by the weighted-average number of shares of common stock outstanding during the period, less shares subject to repurchase. Diluted net loss per share is computed by including all potentially dilutive securities outstanding for the period using the treasury stock method or the if-convertedmethod, as applicable. For periods in which the Company reports net losses, diluted net loss per common share is the same as basic net loss per common share as all potentially dilutive securities are anti-dilutive. The following table sets forth the computation of basic and dilutive net loss per share attributable to common stockholders for the years ended December 31, 2023 and 2024 (in thousands, except per share amounts):

| Numerator:                                                                        |     | 2023 |         |   |     | 2024 |         |   |
|:----------------------------------------------------------------------------------|:----|:-----|--------:|:--|:----|:-----|--------:|:--|
| Net loss                                                                          |     | $    | (82,683 | ) |     | $    | (41,570 | ) |
| Denominator:                                                                      |     |      |         |   |     |      |         |   |
| Weighted-average shares used