Company: GCTS
Filing Date: 2025-03-26
Form Type: 424B3
Source: 0000929638-25-001281
Chunk: 22

Company: GCT Semiconductor Holding, Inc.
Filing Date: 2025-03-26
Form: 424B3
Chunk 22
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-07-31xbrli:pureiso4217:KRWgcts:Segmentxbrli:sharesiso4217:USDxbrli:sharesiso4217:USDutr:Y UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (Mark One)

| ☒ | ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 |

For the fiscal year ended December 31, 2024 OR

| ☐ | TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM TO |

Commission File Number 001-41013 GCT Semiconductor Holding, Inc. (Exact name of Registrant as specified in its Charter)

| Delaware                                                      |                         86-2171699 |
| (State or other jurisdiction ofincorporation or organization) | -I.R.S. EmployerIdentification No. |
| 2290 North 1st Street, Suite 201San Jose, California          |                              95131 |
| (Address of principal executive offices)                      |                          -Zip Code |

Registrant’s telephone number, including area code: ( 408 ) 434-6040 Not Applicable Securities registered pursuant to Section 12(b) of the Act:

| Title of each class                                                                   |     | Trading Symbol(s) |     | Name of each exchange on which registered |
| Common Stock, par value $0.0001 per share                                             |     | GCTS              |     | The New York Stock Exchange               |
| Warrants, each whole warrant exercisable for one share of Common Stock for $11.50 per 
 share                                                                                 |     | GCTSW             |     | The New York Stock Exchange               |

Securities registered pursuant to Section 12(g) of the Act: None Indicate by check mark if the Registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. YES ☐ N o ☒ Indicate by check mark if the Registrant is not required to file reports pursuant to Section 13 or 15(d) of the Act. YES ☐ N o ☒ Indicate by check mark whether the Registrant: (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during