Table of Contents As filed with the U.S. Securities and Exchange Commission on August 25, 2023 Registration No. 333-273930 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Pre-Effective Amendment No. 1 to Form S-1/A REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 INTRUSION INC. (Exact name of registrant as specified in its charter) (State or other jurisdiction of incorporation or organization) Delaware 3576 75-1911917 (Primary Standard Industrial Classification Code Number) (I ...