Company: GCTS
Filing Date: 2025-03-26
Form Type: 424B3
Source: 0000929638-25-001279
Chunk: 207

Company: GCT Semiconductor Holding, Inc.
Filing Date: 2025-03-26
Form: 424B3
Chunk 207
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public information regarding the Company or any of its subsidiaries.

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

Signature:

Print Name:

Date:

<div align='center'>9</div>

Exhibit 19.1

<div align='center'>gct semiconductor holding, inc.

ADDENDUM TO Statement of
Company Policy REGARDING INSIDER TRADING

(as adopted March 15, 2024)</div>

This Addendum applies to all directors, executive officers and certain key employees of GCT Semiconductor Holding, Inc. and its subsidiaries (collectively, the “Company”).

In addition to adopting the Statement of Company Policy Regarding Insider Trading (the “Policy”), the Company has adopted procedures governing transactions in Company Securities by directors, executive officers and key employees. These procedures also apply to other employees who regularly become aware of earnings information or other material nonpublic information about the Company. This Addendum supplements the Policy and describes these procedures.

#### V.
Pre-Clearance Procedures

To help prevent inadvertent violations of the federal securities laws and to avoid even the appearance of trading on inside information, directors, executive officers and key employees of the Company and any other persons designated by the Company’s Chief Financial Officer or Chief Executive Officer as being subject to the Company’s pre-clearance procedures, together with their family members, may not engage in any transaction involving Company Securities (including a stock plan transaction such as an option exercise, gift, loan or pledge or hedge, contribution to a trust, or any other transfer) without first obtaining pre-clearance of the transaction from the Chief Financial Officer or Chief Executive Officer.A request for pre-clearance should be submitted to the Chief Financial Officer or Chief Executive Officer at least five business days in advance of the proposed transaction, unless earlier notice is otherwise required by the Policy (e.g., one week for hedging transactions). The Chief Financial Officer or Chief Executive Officer is under no obligation to approve a trade submitted for pre-clearance, and may in their sole discretion, determine not to permit the trade. If a person seeks pre-clearance and permission to engage in the transaction is denied, then he or she should refrain from initiating any transaction in Company Securities, and should not inform any other person of the restriction. Transactions not effected within the time limit would be subject to pre-clearance again.

When a request for pre-clearance is made, the requestor should carefully consider whether he or she may be aware of any material non