Registration No. As filed with the U.S. Securities and Exchange Commission on April 5, 2024 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM S-1 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 Shuttle Pharmaceuticals Holdings, Inc. (Exact name of registrant as specified in its charter) (State or other jurisdiction of incorporation or organization) Delaware 2834 82-5089826 (Primary Standard Industrial Classification Code Number) (I.R.S. Employer Identification Number) 401 ...