As filed with the U.S. Securities and Exchange Commission on March 7, 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 ____________________ DUNE ACQUISITION CORPORATION II (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 Classificat ...