DEEP ISOLATION NUCLEAR INC

Item 7.01 Regulation FD Disclosure On April 7, 2026, Deep Isolation Nuclear, Inc. (the “Company”) issued a press release announcing that the Company was selected for the U.S. Department of Energy’s (“DOE”) Advanced Research Projects Agency - Energy (“ARPA-E”) SCALEUP Ready program to support the commercial deployment of the Company’s Universal Canister System for integrated nuclear waste management. A copy of the press release is furnished as Exhibit 99.1 and incorporated herein by reference. The information contained in this Item 7.01 and in the accompanying Exhibit 99.1 are being furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, unless expressly incorporated by reference in such filing. Forward-Looking Statements Statements contained in the press release that are not historical facts are “forward-looking statements” within the meaning of Section 27A of the Securities Act and Section 21E of the Securities Exchange Act of 1934, as amended. See the information set forth under the caption “Forward-Looking Statements” in the press release, which is incorporated herein by reference. Selection for award negotiations under the SCALEUP Ready program is not a commitment by DOE to issue an award or provide funding. Before funding is issued, DOE and the applicants will undergo a negotiation process, and DOE may cancel negotiations and rescind the selection for any reason during that time. A contract, if awarded, will be on a “cost plus” reimbursement basis. There can be no assurance that the Company will successfully negotiate a contract with DOE, or if a contract is signed, what the amount of funding provided will be, or that the Company will successfully complete the deliverables under the contract to earn revenues thereunder. Item 9.01 Financial Statements and Exhibits. Exhibit Description Number ──────────────────────────────────────────────────────────────────────────────────────────── 99.1 Press Release, dated April 7, 2026 104 Cover Page Interactive Data File (embedded within the Inline XBRL document)