Company: BLLN
Filing Date: 2025-10-07
Form Type: S-1
Source: 0001193125-25-233697
Chunk: 377

Company: BillionToOne, Inc.
Filing Date: 2025-10-07
Form: S-1
Chunk 377
---
 states and foreign tax jurisdictions in which the Company files tax returns.

| (13) | Employee Benefit Plan |

The Company sponsors a qualified 401(k) defined contribution plan covering eligible employees. Participants may contribute a portion of their annual compensation limited to a maximum annual amount set by the Internal Revenue Service. Employer contributions to the plan are discretionary. During the year ended December 31, 2023 and 2024, the Company contributed $1.7 million and $2.4 million to this plan, respectively.

| (14) | Related Party Transactions |

During the year ended December 31, 2023, the Company’s former CFO left the Company. Upon his departure, the Company’s Board of Directors approved the extension of the exercise period to ten years from the date of grant for all of his common stock options that were fully vested at the time of his departure. The impact on the financial statements resulting from the extension of the exercise term was not material. In February 2024, the Company also repurchased 26,750 shares of common stock that were held by the former CFO. Please refer to Note 11 for additional information on this transaction. There were no other material 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