Company: GCTS
Filing Date: 2025-04-30
Form Type: POS AM
Source: 0000929638-25-001738
Chunk: 2

Company: GCT Semiconductor Holding, Inc.
Filing Date: 2025-04-30
Form: POS AM
Chunk 2
---
 with the Selling Stockholder. On April 23, 2025, the Registrant filed a Registration Statement on Form S-3 (File No. 333-286713) with the SEC, which was declared effective on April 30, 2025, to register, pursuant to the Common Stock Purchase Agreement, all unsold or unissued Common Stock of the Selling Stockholder under the S-1 Registration Statement. For ease of reference, all share numbers above are as stated in the S-1 Registration Statement. Any and all offerings of the Registrant’s securities pursuant to the S-1 Registration Statement have been terminated. Accordingly, the Registrant hereby terminates the effectiveness of the S-1 Registration Statement. In addition, in accordance with undertakings made by the Registrant in the S-1 Registration Statement to remove from registration, by means of a post-effective amendment, any securities being registered which remain unsold at the termination of the offering, the Registrant hereby removes from registration all securities registered under the S-1 Registration Statement that remain unsold under the S-1 Registration Statement as of the date hereof. The S-1 Registration Statement is hereby amended, as appropriate, to reflect the deregistration of such securities.

SIGNATURES Pursuant to the requirements of the Securities Act of 1933, the Registrant has duly caused this Post-Effective Amendment No. 1 to the Registration Statement to be signed on its behalf by the undersigned, thereunto duly authorized in San Jose, California, on April 30, 2025.

| GCT SEMICONDUCTOR HOLDING, INC. |                         |
| By:                             | /s/ John Schlaefer      |
| Name:                           | John Schlaefer          |
| Title:                          | Chief Executive Officer |

No other person is required to sign this Post-Effective Amendment No. 1 to the Registration Statement in reliance on Rule 478 of the Securities Act of 1933, as amended.