As filed with the U.S. Securities and Exchange Commission on April 29, 2025. Registration No. 333-285639 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 ____________________ AMENDMENT NO. 2 TO 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 Stand ...