X0609 4 2026-10-06 0 0001918080 Deep Isolation Nuclear, Inc. DBHL 0002080757 Baltzer Rodney false C/O DEEP ISOLATION NUCLEAR, INC. 5717 LEGACY DRIVE, STE 250, OFFICE 2079 PLANO TX 75024 1 1 0 0 President and CEO 0 Common Stock 2026-10-06 4 A 0 82054 0 A 1161764 D Stock Option (right to buy) 3.50 2026-10-06 4 A 0 93212 0 A 2036-09-29 Common Stock 93212 93212 D Stock Option (right to buy) 3.50 2026-10-06 4 A 0 38526 0 A 2036-09-29 Common Stock 38526 38526 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: 20,514 RSUs on September 29, 2027, 20,513 RSUs on September 29, 2028, 20,514 RSUs on September 29, 2029 and 20,513 RSUs on September 29, 2030, 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: 22,500 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 through September of each of 2028, 2029 and 2030, 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: 10,435 option shares on September 29, 2027, 2,201 option shares on September 29, 2028 and 1,190 option shares on September 29, 2029, with the remaining option shares vesting in monthly installments of 2,744 or 2,745 option shares on each of October 29, November 29 and December 29 of 2027, 2028 and 2029, in each case subject to the Reporting Person's continued service through each vesting date. /s/ Rodney Baltzer 2026-10-08