X0508 4 2025-11-11 0 0001877939 Castellum, Inc. CTM 0002036177 Merriman Andrew 1934 OLD GALLOWS ROAD SUITE 350 VIENNA VA 22182 0 1 0 0 Chief Operating Officer 0 Stock Options 1.19 2025-11-11 4 A 0 275000 0 A 2032-11-10 Common Stock 275000 275000 D In connection with his continued employment, on November 11, 2025 Mr. Merriman received 275,000 stock options issued pursuant to the Castellum, Inc. Second Amended 2021 Stock Incentive Plan to purchase 275,000 shares of common stock, which vest ratably over twenty months, commencing December 1, 2025. /s/ Andrew Merriman 2025-11-13