DEEP ISOLATION NUCLEAR INC

Item 5.02 Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers. Appointment of Certain Officers On February 3, 2026, Ms. Paula Whitten-Doolin began serving as the General Counsel of Deep Isolation, Inc., the wholly-owned operating subsidiary of Deep Isolation Nuclear, Inc. (the “Company”). Ms. Whitten-Doolin, age 46, brings more than fifteen years of experience in corporate and legal affairs to the Company. She previously served as General Counsel, Chief Administrative Officer and Chief Compliance Officer for Houston First Corporation. Before that, Ms. Whitten-Doolin served as General Counsel and Chief Compliance Officer for Ideanomics, a multi-national publicly-traded electric vehicle and renewables corporation. She also served as Head of Legal Operations and Chief Legal Counsel, North America for Neste and held senior legal roles at Schlumberger and MI SWACO, Cooper Industries/Eaton. Ms. Whitten-Doolin currently serves as an independent director for Vuzix Corporation. Ms. Whitten-Doolin, as General Counsel, will be one of the Company’s named executive officers. Ms. Whitten-Doolin does not have any family relationship with any director, executive officer or person nominated or chosen by the registrant. There are no related party transactions between Ms. Whitten-Doolin or any member of her immediate family and the Company that would require disclosure under Item 404(a) of Regulation S-K. The Company and Ms. Whitten-Doolin entered into the Company’s standard form of indemnification agreement. This agreement requires the Company to indemnify Ms. Whitten-Doolin to the fullest extent permitted by applicable law for certain liabilities to which she may become subject as a result of her service as an officer of the Company. The foregoing summary of the indemnification agreement does not purport to be complete and is subject to, and qualified in its entirety by, the full text of the form indemnification agreement, a copy of which is filed as Exhibit 10.5 to the Company’s Current Report on Form 8-K filed with the SEC on July 28, 2025. Compensatory Arrangements of Certain Officers In connection with Ms. Whitten-Doolin’s appointment to serve as General Counsel, she and the Company executed an offer letter of employment (the “Employment Offer Letter”). Pursuant to the Employment Offer Letter, Ms. Whitten-Doolin is entitled to an annual base salary of $350,000, (ii) is eligible for a performance-based target bonus of 50% of her annual base salary, (iii) and will be awarded 75,000 restricted stock units and 25,000 stock options subject to the terms and conditions of the Company’s equity incentive plan and provided in the Employment Offer Letter and (iv) may participate in the Company’s standard employee benefits program. Ms. Whitten-Doolin also entered into the Company’s Employee Confidential Information and Inventions Assignment Agreement.

Item 7.01 Regulation FD Disclosure On February 3, 2026, the Company issued a press release announcing Ms. Whitten-Doolin’s appointment. 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. Item 9.01 Financial Statements and Exhibits. Exhibit Description Number ──────────────────────────────────────────────────────────────────────────────────────────── 99.1 Press Release, dated February 3, 2026 104 Cover Page Interactive Data File (embedded within the Inline XBRL document)