X0609 4 2026-09-16 0 0001918080 Deep Isolation Nuclear, Inc. DBHL 0002080569 Angell Jonathon false C/O DEEP ISOLATION NUCLEAR, INC. 2001 ADDISON STREET, SUITE 300 BERKELEY CA 94704 1 0 0 0 0 Common Stock 2026-09-16 4 A 0 70000 0 A 458907 D Represents a grant of restricted stock units ("RSUs") to the Reporting Person pursuant to the Deep Isolation Nuclear, Inc. 2025 Equity Incentive Plan. Each RSU represents a contingent right to receive one share of common stock. Upon issuance the RSUs immediately vested, but their conversion into shares of common stock of the Issuer is deferred until the earliest of the following events to occur: (i) a change of control of the Issuer, (ii) a separation of service as a director by the Reporting Person, or (iii) death of the Reporting Person.. /s/ Jonathon Angell 2026-09-18