Registration No. 333- UNITED STATES Table of Contents As filed with the Securities and Exchange Commission on May 21, 2024. SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM S-1 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 GCT Semiconductor Holding, Inc. (Exact Name of Registrant as Specified in Its Charter) (State or Other Jurisdiction of Incorporation or Organization) (Primary Standard Industrial Classification Code Number) Delaware 6770 86-2171699 (I.R.S. Employer Identification N ...

Table of Contents UNDER THE SECURITIES ACT OF 1933 GCT Semiconductor Holding, Inc. SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 AMENDMENT NO. 1 FORM S-1 REGISTRATION STATEMENT As filed with the Securities and Exchange Commission on May 17, 2024. Registration No. 333-278809 UNITED STATES (Exact Name of Registrant as Specified in Its Charter) (State or Other Jurisdiction of Incorporation or Organization) Delaware 6770 86-2171699 (Primary Standard Industrial Classification Code Number) (I.R.S. Emp ...