X0609 4 2026-10-06 0 0001918080 Deep Isolation Nuclear, Inc. DBHL 0001879973 Nelson Joseph Eugene false C/O DEEP ISOLATION NUCLEAR, INC. 5717 LEGACY DRIVE, STE 250, OFFICE 2079 PLANO TX 75024 0 1 0 0 CFO and Treasurer 0 Common Stock 2026-10-06 4 A 0 3577 0 A 103577 D Stock Option (right to buy) 3.50 2026-10-06 4 A 0 5744 0 A 2036-09-29 Common Stock 5744 5744 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 vesting. The RSUs shall vest as follows: 894 RSUs on September 29, 2027, 895 RSUs on September 29, 2028, 894 RSUs on September 29, 2029 and 894 RSUs on September 29, 2030, in each case subject to the Reporting Person's continued service through each vesting date. Represents a grant of incentive stock option pursuant to the Deep Isolation Nuclear, Inc. 2025 Equity Incentive Plan. The option shall vest as follows: 1,436 option shares on September 29, 2027 and the remaining option shares in 36 monthly installments thereafter through September 29, 2030, in each case subject to the Reporting Person's continued service through each vesting date. /s/ Joseph Nelson 2026-10-08