Company: BLLN
Filing Date: 2025-10-17
Form Type: S-1/A
Source: 0001193125-25-242632
Chunk: 348

Company: BillionToOne, Inc.
Filing Date: 2025-10-17
Form: S-1/A
Chunk 348
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4. Account balances are written off against the allowance after all means of collection have been exhausted without success. During the years ended December 31, 2023 and 2024, there were no write-offs of accounts receivable. Inventories Inventories consist primarily of supplies for prenatal testing, consumables and lab supplies (including reagents) which are stated at the lower-of-costor net realizable value. The cost of inventory is determined on an average F-10

B ILLIONT OO NE, INC. Notes to Financial Statements cost method. Inventory that is obsolete or in excess of forecasted demand is written down to its estimated net realizable value. The Company periodically reviews its inventory and writes off products that are determined to be obsolete based on market factors, utilization rates and product expiration dates. Inventory write-downs are recognized as cost of revenue in the accompanying statements of operations and comprehensive loss. During the years ended December 31, 2023 and 2024, inventory write-downs totaled approximately $0.1 million and $0.1 million, respectively, and were related to expired and unusable products. Property and Equipment, Net Property and equipment, net is stated at historical cost less accumulated depreciation and amortization. Depreciation and amortization on property and equipment is calculated using the straight-line method over the estimated useful lives of the assets which are as follows:

| Machinery and equipment |     | 5 years                |
| Furniture and fixtures  |     | 5 years                |
| Automobiles             |     | 5 years                |
| Computer hardware       |     | 3 years                |
| Computer software       |     | 3 years                |
| Leasehold improvements  |     | Shorter of 10 years or 
 remaining lease term   |

Maintenance and repairs are charged to expenses as incurred. The Company entered into finance leases for certain lab equipment. The Company records amortization of assets leased in connection with finance lease arrangements as depreciation expense. Impairment of Long-Lived Assets The Company evaluates long-lived assets for indicators of possible impairment when events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. Recoverability of assets held and used is measured by comparison of the carrying amount of an asset or an asset group to estimated undiscounted future net cash flows expected to be generated by the asset or asset group. If the carrying amount of an asset exceeds these estimated future cash flows, an impairment charge is recognized by the amount by which the carrying amount of the