1RT Acquisition Corp Unit(ONCHU) - Prospectus(update)

As filed with the United States Securities and Exchange Commission on June 20, 2025 Registration No. 333-287941 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 ____________________________ 1RT Acquisition Corp. (Exact name of registrant as specified in its charter) ____________________________ | | | (State or other jurisdiction of incorporation or organization) (Primary Standard Industrial Classificat ...