The Company has been in settlement negotiations with a representative for six stockholder plaintiff firms alleging the Company violated Delaware law in its preliminary proxy statement that was disseminated to stockholders in November 2022 for the Company’s annual meeting held in December 2022. Based on these settlement negotiations to date, the Company estimates that it will settle for no more than an aggregate of $0.2 million and, therefore, had an accrual for the estimated liability of $0.2 million as of June 30, 2026 and December 31, 2025. This balance is included in accrued expenses on the unaudited Condensed Consolidated Balance Sheets.

In May 2025 and May 2026, the Company entered into supply agreements with the U.S. Department of Energy (DOE) under which the Company will purchase Thorium-228 from the DOE between 2025 and 2027. The Company has met and been invoiced for its minimum purchase requirements under the May 2025 supply agreement. The May 2026 supply agreement includes a “take-or-pay” provision pursuant to which the Company is committed to purchasing approximately $9.9 million of Thorium-228 during the term of the agreement.

In 2025 and 2026, the Company entered into agreements with a general contractor pursuant to which the Company is committed to pay approximately $53.3 million. The agreements are for the general contractor to make building modifications at the Company’s facilities in the metropolitan areas of Chicago, IL, and Los Angeles, CA, and to prepare for the installation of some of the Comecer manufacturing equipment and associated clean rooms at those sites. The Company anticipates incurring additional spending with this general contractor, and actual costs may differ. The Company expects to complete construction at the Chicago-area site in early 2027 and at the Los Angeles-area site by the end of 2027.