Commitments and Contingencies	6 Months Ended
Jun. 30, 2026
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Legal Proceedings From time to time, the Company is party to certain claims in the ordinary course of business. The Company, in conjunction with its legal counsel, assesses the need to record a liability for litigation or contingencies. A liability is recorded when and if it is determined that such a liability for litigation or contingencies is both probable and the amount can be reasonably estimated. The Company believes that it is not presently a party to any litigation, other than as described below, the outcome of which, if determined adversely, would individually or in the aggregate be expected to have a material and adverse effect on the business, operating results, cash flows, or financial position. Legal fees are expensed in the period in which they are incurred. Illumina, Inc. v. BillionToOne, Inc. On May 7, 2026, Illumina, Inc. filed a lawsuit in the U.S. District Court in the State of Delaware alleging that the Company’s UNITY test infringes U.S. Patent Nos. 10,612,096, 12,139,760 and 12,435,373. The Company maintains that Illumina’s allegations are without merit, and is vigorously defending itself against this claim. The Company does not believe that a loss is probable or reasonably estimable related to this matter. For more information regarding risks relating to our intellectual property, see Part I, Item 1A, 'Risk Factors,' of the Company's Annual Report on Form 10-K for the fiscal year ended December 31, 2025. Indemnification Agreements The Company has entered into indemnification agreements with its directors and officers against any liabilities that may arise by reason of their status or service as directors or officers, other than liabilities arising from willful misconduct of the individual. Additionally, in the ordinary course of business, the Company enters into agreements of varying scope and terms pursuant to which it agrees to indemnify customers, vendors, lessors, business partners, and other parties with respect to certain matters, including, but not limited to, losses arising out of the breach of such agreements, services to be provided by the Company, or from intellectual property infringement claims made by third parties. As of June 30, 2026 and December 31, 2025, no demands have been made upon the Company to provide indemnification under such agreements, and there are no claims that the Company is aware of that could have a material adverse effect on its financial position, results of operations, or cash flows. Accordingly, the Company has no liabilities recorded for these agreements as of June 30, 2026 and December 31, 2025.

From time to time, the Company is party to certain claims in the ordinary course of business. The Company, in conjunction with its legal counsel, assesses the need to record a liability for litigation or contingencies. A liability is recorded when and if it is determined that such a liability for litigation or contingencies is both probable and the amount can be reasonably estimated. The Company believes that it is not presently a party to any litigation, other than as described below, the outcome of which, if determined adversely, would individually or in the aggregate be expected to have a material and adverse effect on the business, operating results, cash flows, or financial position. Legal fees are expensed in the period in which they are incurred.

On May 7, 2026, Illumina, Inc. filed a lawsuit in the U.S. District Court in the State of Delaware alleging that the Company’s UNITY test infringes U.S. Patent Nos. 10,612,096, 12,139,760 and 12,435,373. The Company maintains that Illumina’s allegations are without merit, and is vigorously defending itself against this claim. The Company does not believe that a loss is probable or reasonably estimable related to this matter. For more information regarding risks relating to our intellectual property, see Part I, Item 1A, 'Risk Factors,' of the Company's Annual Report on Form 10-K for the fiscal year ended December 31, 2025.

The Company has entered into indemnification agreements with its directors and officers against any liabilities that may arise by reason of their status or service as directors or officers, other than liabilities arising from willful misconduct of the individual.

Additionally, in the ordinary course of business, the Company enters into agreements of varying scope and terms pursuant to which it agrees to indemnify customers, vendors, lessors, business partners, and other

parties with respect to certain matters, including, but not limited to, losses arising out of the breach of such agreements, services to be provided by the Company, or from intellectual property infringement claims made by third parties. As of June 30, 2026 and December 31, 2025, no demands have been made upon the Company to provide indemnification under such agreements, and there are no claims that the Company is aware of that could have a material adverse effect on its financial position, results of operations, or cash flows. Accordingly, the Company has no liabilities recorded for these agreements as of June 30, 2026 and December 31, 2025.