X0609 4 2026-10-06 0 0001918080 Deep Isolation Nuclear, Inc. DBHL 0002081236 Sloane Jesse false C/O DEEP ISOLATION NUCLEAR, INC. 5717 LEGACY DRIVE, STE 250, OFFICE 2079 PLANO TX 75024 0 1 0 0 Executive VP of Engineering 0 Common Stock 2026-10-06 4 A 0 58594 0 A 71927 D Stock Option (right to buy) 3.50 2026-10-06 4 A 0 79027 0 A 2036-09-29 Common Stock 79027 79027 D Stock Option (right to buy) 3.50 2026-10-06 4 A 0 15046 0 A 2036-09-29 Common Stock 15046 15046 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: 14,649 RSUs on September 29, 2027, 14,648 RSUs on September 29, 2028, 14,649 RSUs on September 29, 2029 and 14,648 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: 20,000 option shares on September 29, 2027, with the remaining option shares vesting in monthly installments on the 29th day of each month (or the last day of the month, if earlier) from January 29, 2028 through September 29, 2030, other than December 2028 and December 2029, in each case subject to the Reporting Person's continued service through each vesting date. Represents a grant of non-qualified stock option pursuant to the Deep Isolation Nuclear, Inc. 2025 Equity Incentive Plan. The option shall vest as follows: 3,518 option shares on September 29, 2027, 1,960 option shares on each of October 29, November 29 and December 29, 2027, 1,558 option shares on November 29, 2028, 1,960 option shares on December 29, 2028, 170 option shares on November 29, 2029 and 1,960 option shares on December 29, 2029, in each case subject to the Reporting Person's continued service through each vesting date. /s/ Jesse Sloane 2026-10-08