Form 4 Filing by Katrinka McCallum

Katrinka McCallum, a director at INTRUSION INC, reported a transaction on August 26, 2026. McCallum acquired 5,834 shares of Common Stock through the exercise of a Warrant. The exercise price for the warrant was $0.67 per share, and the transaction was completed at a price of $0.795 per share for the Common Stock. This acquisition resulted in McCallum holding 141,551 shares of Common Stock post-transaction. Additionally, a Warrant for 5,834 shares of Common Stock was exercised, with the transaction code indicating an acquisition. This exercise was linked to a Warrant Inducement Letter dated August 14, 2026, where one new Warrant was granted for each Warrant exercised. The number of shares owned following this transaction is 5,834.