Company: GCTS
Filing Date: 2025-06-06
Form Type: POS AM
Source: 0000929638-25-002188
Chunk: 0

Company: GCT Semiconductor Holding, Inc.
Filing Date: 2025-06-06
Form: POS AM
Chunk 0
---
As filed with the Securities and Exchange Commission on June 6, 2025 Registration No. 333-278809 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 POST-EFFECTIVE AMENDMENT NO. 1 TO FORM S-1 REGISTRATION STATEMENT NO. 333-278809 UNDER THE SECURITIES ACT OF 1933 GCT Semiconductor Holding, Inc. (Exact name of registrant as specified in its charter)

| Delaware                        |     |                         6770 |     | 86-2171699            |
| (State or other jurisdiction of 
 incorporation or organization)  |     | -Primary Standard Industrial 
   Classification Code Number |     | -I.R.S. Employer      
 Identification Number |

GCT Semiconductor Holding, Inc. 2290 North 1st Street, Suite 201 San Jose, California 95131 (408) 434-6040 (Address, including zip code, and telephone number, including area code, of registrant’s principal executive offices) John Schlaefer Chief Executive Officer GCT Semiconductor Holding, Inc. 2290 North 1st Street, Suite 201 San Jose, California 95131 (408) 434-6040 (Name, address, including zip code, and telephone number, including area code, of agent for service) With copies to: Albert Lung, Esq. Morgan, Lewis & Bockius LLP 1400 Page Mill Road Palo Alto, CA 94304 (650) 843-4000 Approximate date of commencement of proposed sale to the public: Not applicable. If the only securities being registered on this Form are being offered pursuant to dividend or interest reinvestment plans, please check the following box. ☐ If any of the securities being registered on this Form are to be offered on a delayed or continuous basis pursuant to Rule 415 under the Securities Act of 1933, other than securities offered only in connection with dividend or interest reinvestment plans, check the following box. ⌧ If this Form is filed to register additional securities for an offering pursuant to Rule 462(b) under the Securities Act, please check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering. ☐ If this Form is a post-effective amendment filed pursuant to Rule 462(c) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering.