Table of Contents As filed with the U.S. Securities and Exchange Commission on December 4, 2025 Registration No. 333-290602 TO FORM S-1 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 Black Spade Acquisition III Co (Exact Name of Registrant as Specified in Its Charter) UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 AMENDMENT NO. 1 (Address, including zip code, and telephone number, including area code, of registrant's principal executive offices) Cogency Global Inc. 122 East ...

Table of Contents As filed with the U.S. Securities and Exchange Commission on September 30, 2025 Registration No. 333- UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM S-1 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 Black Spade Acquisition III Co (Exact Name of Registrant as Specified in Its Charter) (State or other jurisdiction of incorporation or organization Cayman Islands 6770 N/A (Primary Standard Industrial Classification Code Number) (I.R.S. Employer Identific ...