As filed with the U.S. Securities and Exchange Commission on April 11, 2023 Registration No. 333-267375 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 AMENDMENT NO. 4 FORM S-1 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 _____________________________ NAUTICUS ROBOTICS, INC. (Exact Name of Registrant as Specified in its Charter) _____________________________ | Delaware | 3569 | 85-1699753 | | --- | --- | --- | | (State or other jurisdiction of | (Primary Standard Industria ...