X0609 4 2026-10-06 0 0001918080 Deep Isolation Nuclear, Inc. DBHL 0001951825 Whitten-Doolin Paula Beck false C/O DEEP ISOLATION NUCLEAR, INC. 5717 LEGACY DRIVE, STE 250, OFFICE 2079 PLANO TX 75024 0 1 0 0 GC and Corporate Secretary 0 Common Stock 2026-10-06 4 A 0 2976 0 A 77976 D Stock Option (right to buy) 3.50 2026-10-06 4 A 0 4778 0 A 2036-09-29 Common Stock 4778 4778 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: 744 RSUs on each of September 29, 2027, September 29, 2028, September 29, 2029 and 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: 1,195 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/ Paula Whitten-Doolin 2026-10-08