X0508 4 2026-01-28 0 0001923891 Nano Nuclear Energy Inc. NNE 0002021757 Walker James John 10 TIMES SQUARE, 30TH FLOOR NEW YORK NY 10018 1 1 0 0 Chief Executive Officer 1 Common Stock 2026-01-28 4 M 0 170000 1.50 A 445000 D Common Stock 2026-01-28 4 S 0 86098 33.6438 D 358902 D Common Stock 2026-01-28 4 S 0 76171 34.3708 D 282731 D Common Stock 2026-01-28 4 S 0 7731 35.2626 D 275000 D Common Stock 2026-01-28 4 S 0 13581 33.6599 D 261419 D Common Stock 2026-01-28 4 S 0 10609 34.3839 D 250810 D Common Stock 2026-01-28 4 S 0 810 35.2733 D 250000 D Stock Options 1.50 2026-01-28 4 M 0 170000 0 D Common Stock 170000 830000 D Represents the number of shares of common stock issued upon exercise of certain options originally granted to the reporting person at the exercise price of $1.50 per share, which were fully vested and exercisable on February 10, 2023, with expiry on February 10, 2026. On January 28, 2026, such options were exercised. This transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person in September 2025. This transaction was executed in multiple trades during the day at prices ranging from $33.1200 to $34.1200. The weighted-average price is reported above. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transactions were effected. This transaction was executed in multiple trades during the day at prices ranging from $34.1300 to $34.9400. The weighted-average price is reported above. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transactions were effected. This transaction was executed in multiple trades during the day at prices ranging from $35.2400 to $35.3700. The weighted-average price is reported above. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transactions were effected. This transaction was executed in multiple trades during the day at prices ranging from $33.1500 to $34.1450. The weighted-average price is reported above. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transactions were effected. This transaction was executed in multiple trades during the day at prices ranging from $34.1700 to $34.8900. The weighted-average price is reported above. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transactions were effected. This transaction was executed in multiple trades during the day at prices ranging from $35.2500 to $35.3500. The weighted-average price is reported above. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transactions were effected. /s/ James John Walker 2026-01-30