As filed with the U.S. Securities and Exchange Commission on March 28, 2025. Registration No. 333-285075 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 AMENDMENT NO. 1 TO FORM S-1 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 15 E. Putnam Avenue Suite 363 Greenwich, CT 06830 (203) 489-2110 (Address, including zip code, and telephone number, including area ...