As filed with the U.S. Securities and Exchange Commission on April 19, 2024. Registration No. 333- UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM S-1 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 GP-Act III Acquisition Corp. (Exact Name of Registrant as Specified in its Charter) (State or Other Jurisdiction of Incorporation or Organization) Cayman Islands 6770 N/A (Primary Standard Industrial Classification Code Number) (IRS Employer Identification Number) 300 Park Av ...