Company: BLLN
Filing Date: 2025-10-07
Form Type: S-1
Source: 0001193125-25-233697
Chunk: 341

Company: BillionToOne, Inc.
Filing Date: 2025-10-07
Form: S-1
Chunk 341
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 market funds. The
money market fund policies require the weighted average maturity of the fund’s securities holdings not to exceed 90 days.

Concentration of Credit Risk

Financial instruments that potentially expose the Company to significant concentration of credit risk consist primarily of cash and
cash equivalents and accounts receivable. The Company’s cash and cash equivalents are generally held with large financial institutions. Certain deposits held with these financial institutions are in excess of the amount of FDIC insured limits
provided on such deposits.

F-9

B ILLIONT OO NE, INC. Notes to Financial Statements As of December 31, 2023 and 2024, no customers represented more than 10% of accounts receivable, and for the years ended December 31, 2023 and 2024, no customers represented more than 10% of the Company’s revenue. Fair Value of Financial Instruments The Company records certain of its financial assets and liabilities at fair value, including money market funds, which are measured at fair value using quoted prices in active markets (Level 1 inputs). The carrying amounts of the Company’s other financial instruments, which include cash, accounts receivable, and accounts payable approximate their fair values due to their short-term nature. The accounting guidance for fair value provides a framework for measuring fair value, clarifies the definition of fair value, and expands disclosures regarding fair value measurements. Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability (an exit price) in an orderly transaction between market participants at the reporting date. The accounting guidance establishes a three-tiered hierarchy, which prioritizes the inputs used in the valuation methodologies in measuring fair value as follows:

| Level 1 input |     | Quoted prices (unadjusted) in active markets for identical assets or liabilities that the reporting entity can access at the measurement date.                                                                                         |
| Level 2 input |     | Inputs other than the quoted prices included within Level 1 that are observable for the assets or liability, either directly or indirectly.                                                                                            |
| Level 3 input |     | Unobservable inputs for the assets or liability. Unobservable inputs shall be used to measure fair value to the extent that relevant observable inputs are not available, thereby allowing for situations in which there is little, if 
 any, market activity for the asset or liability at the measurement date.                                                                                                                                                               |

A financial instrument’s categorization within the valuation hierarchy is based upon the lowest level of input that is significant to the fair value measurement. The Company