Iron Horse Acquisition II(IRHOU) - Prospectus(update)

As filed with the Securities and Exchange Commission on August 6, 2025 Registration No. 333-284331 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Amendment No. 4 Form S-1 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 ____________________ IRON HORSE ACQUISITIONS CORP. II (Exact name of registrant as specified in its charter) ____________________ | Cayman Islands | 6770 | 33-2152065 | | --- | --- | --- | | (State or other jurisdiction of | (Primary Standard Industrial | (I.R ...