Company: GCTS
Filing Date: 2025-07-25
Form Type: PRE 14A
Source: 0000950170-25-098780
Chunk: 2

Company: GCT Semiconductor Holding, Inc.
Filing Date: 2025-07-25
Form: PRE 14A
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, you may vote and ask questions by following the instructions available on the meeting website. Please note, however, that if your shares are held of record by a broker, bank, or other nominee and you wish to vote at the meeting, you must obtain a proxy issued in your name from that record holder. Your proxy is revocable in accordance with the procedures set forth in the proxy statement.

You are encouraged to log in to this website before the Annual Meeting begins. Online check-in will be available approximately 15 minutes before the meeting starts. If you encounter any difficulties accessing or

participating in the meeting through the meeting website, please call the support team at the number listed on the website log-in screen.

By order of the Board of Directors

/s/ John Schlaefer

President and Chief Executive Officer

San Jose, California

[ ], 2025

<div align='center'>* Your vote is important, so please act today! *

Important Notice regarding the Availability of Proxy Materials

for the 2025 Annual Meeting of Stockholders of GCT Semiconductor Holding, Inc.

to be held on September 18, 2025</div>

On or about [ ], 2025, the Notice of Annual Meeting of Stockholders, Proxy Statement, Proxy Card and Annual Report for the fiscal year ending December 31, 2024 may be accessed over the internet free of charge athttps://www.cstproxy.com/gctsemi/2025.

Whether or not you plan to attend the annual meeting, we encourage you to vote and submit your proxy via the internet, telephone, or mail. For additional instructions on voting by the internet or telephone, please refer to your proxy card. To vote and submit your proxy by mail, please complete, sign, and date the enclosed proxy card and return it in the enclosed envelope. If you attend the Annual Meeting, you may revoke your proxy and vote virtually. If you hold your shares through an account with a brokerage firm, bank, or other nominee, please follow the instructions you receive from your account manager to vote your shares.

Forward-Looking Statements The Company cautions that any forward-looking statements (as such term is defined in the Private Securities Litigation Reform Act of 1995) contained in this Proxy Statement involve risks and uncertainties and are subject to change based on various important factors, many of which may be beyond the Company’s control. Words such as “approximate,” “outlook,” “estimate,” “project,” “plan,” “believe,”