Company: GCTS
Filing Date: 2025-03-26
Form Type: 424B3
Source: 0000929638-25-001279
Chunk: 211

Company: GCT Semiconductor Holding, Inc.
Filing Date: 2025-03-26
Form: 424B3
Chunk 211
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 Party Rights . Neither the Policy nor this Addendum is intended to create any rights in third parties with respect to any violation of its terms and neither is intended to create any legal liability for the Company or any employee, officer or director beyond those for which they are already responsible under applicable securities laws.

Certifications . All directors, officers and employees subject to the procedures set forth in this Addendum must certify their understanding of, and intent to comply with, the Policy and this Addendum. Please return an executed copy of the attached certification immediately.

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CERTIFICATION(For Executive Officers, Directors and Certain Key Employees)</div>

I hereby certify that:

1. I have read and understand the Statement of Company Policy Regarding Insider Trading (the “Insider Trading Policy”) dated March 15, 2024 of GCT Semiconductor Holding, Inc.(the “Company”) and the Addendum to such policy dated March 15, 2024 (collectively, the “Insider Trading Policy”). I understand that the Chief Financial Officer and the legal counsel of the Company are available to answer any questions I have regarding the Insider Trading Policy.

2. I agree that I will comply with the Insider Trading Policy for as long as I am subject to such policy.

3.I understand that all of my trades must be preapproved by the Company’s Chief Financial Officer, Chief Executive Officer, or such other person as the Company may designate from time to time.

4. I agree that the Company may at any time and in its sole discretion issue a prohibition on trading in Company Securities, and that the Company shall have full power and authority to cancel any outstanding orders, including good until cancelled orders, that I may place, but I understand that I have the sole responsibility for compliance with the Insider Trading Policy. I further agree and represent that I will not trade in Company Securities while I am in possession of material nonpublic information regarding the Company or any of its subsidiaries.

5. This certification constitutes consent for the Company to issue any necessary stop-transfer orders to the Company’s transfer agent to enforce compliance with the Insider Trading Policy.

Signature:

Print Name:

Date:

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Exhibit 23.1

<div align='center'>CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM</div>

We hereby consent to the incorporation by reference in the Registration Statements on Form S-­1 (Nos. 333-278809 and 333-279600) and Form S-8 (No.