DEEP ISOLATION NUCLEAR INC

Item 7.01 Regulation FD Disclosure. On July 23, 2026, Deep Isolation Nuclear, Inc., a Delaware corporation (the “Company”), issued a press release (the “Press Release”) announcing that it has been selected as the sole industrial partner on three competitive federal grants awarded through the U.S. Department of Energy’s (DOE) Project GENESIS program. Two initiatives are led by Lawrence Berkeley National Laboratory (LBNL) and one is led by the University of South Carolina and aim to advance artificial intelligence-enabled repository site screening, design and performance analysis for nuclear waste disposal. A copy of the Press Release referenced above is being furnished as Exhibit 99.1 to this Current Report on Form 8-K. The information in this Current Report on Form 8-K, including Exhibit 99.1, shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “1934 Act”), nor shall it be deemed “incorporated by reference” into any filing under the Securities Act of 1933, as amended, or the 1934 Act, except as may be expressly set forth by specific reference in such filing. Item 9.01 Financial Statements and Exhibits. Exhibit Number Description ─────────────────────────────────────────────────────────────────────────────────────────────────── 99.1 Press Release, dated July 23, 2026 104 Cover Page Interactive Data File (embedded within the Inline XBRL document)