As filed with the U.S. Securities and Exchange Commission on September 8, 2025. Registration No. 333-278407 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 ____________________ Amendment No. 4 Cayman Islands 3351 Not Applicable (State or other jurisdiction of incorporation or organization) (Primary Standard Industrial Classification Code Number) to FORM F-1 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 ____________________ XINXU COPPER INDUSTRY TECHNOLOGY LIMITED (Exact nam ...