As filed with the Securities and Exchange Commission on December 19, 2025 Registration No. 333-290947 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 RF Acquisition Corp III (Exact name of registrant as specified in its charter) Cayman Islands 6770 N/A (State or other jurisdiction of incorporation or organization) (Primary Standard Industrial (I.R.S. Employer Identification Number) RF Acquisition Corp ...