As filed with the U.S. Securities and Exchange Commission on June 5, 2025. Registration No. 333-285075 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 AMENDMENT NO. 3 TO FORM S-1 (Primary Standard Industrial Classification Code Number) (I.R.S. Employer Identification Number) REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 Blue Water Acquisition Corp. III (Exact name of registrant as specified in its charter) Cayman Islands 6770 33-2301550 (State or other jurisdiction of incor ...