As filed with the U.S. Securities and Exchange Commission on March 3, 2026. Registration Statement No. 333-[•] UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form F-1 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 CDT Environmental Technology Investment Holdings Limited (Exact name of Registrant as specified in its charter) Not Applicable (Translation of Registrant's name into English) (State or other jurisdiction of incorporation or organization) (Primary Standard Industri ...