Company: GCTS
Filing Date: 2025-03-26
Form Type: 424B3
Source: 0000929638-25-001281
Chunk: 191

Company: GCT Semiconductor Holding, Inc.
Filing Date: 2025-03-26
Form: 424B3
Chunk 191
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 GCT Research, Inc.

Address: 11F., Specialty Construction Center, 15, Boramae-ro 5-gil, Dongjak Gu, Seoul 07071, Korea

| By: | /s/ Jeongmin Kim |

Name: Jeongmin Kim

Title: President and Representative Director

<div align='center'>2</div>

Exhibit 19.1

<div align='center'>GCT SEMICONDUCTOR HOLDING, INC.

Statement of Company Policy REGARDING INSIDER TRADING

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

This policy applies to all officers, directors and employees of GCT Semiconductor Holding, Inc. and its subsidiaries (collectively, the “Company”) and supersedes all prior insider trading policies of the Company.

#### I.
The Need For A Policy Statement

Under the federal securities laws, it is illegal to trade in transactions in the Company’s securities (collectively referred to in this Policy as “Company Securities”) while in the possession of material nonpublic information about the Company. It is also illegal to disclose or give material nonpublic information to others who may trade on the basis of that information or to advise others how to trade while in possession of material nonpublic information. Any person who possesses material nonpublic information about the Company is deemed to be an “insider.” The category of insiders isNOTlimited to officers and directors of the Company.

Insider trading violations are pursued vigorously by the Securities and Exchange Commission (the “SEC”) and the U.S. Department of Justice, and such violations are punished severely. While the regulatory authorities concentrate their efforts on the individuals who trade, or who tip inside information to others who trade, the federal securities laws also impose potential liability on companies and other controlling persons if they fail to take reasonable steps to prevent insider trading by company personnel. Both the SEC and the New York Stock Exchange are very effective at detecting and pursuing insider trading cases. The SEC has successfully prosecuted cases against employees trading through foreign accounts, trading by family members and friends, and trading involving only a small number of shares.

The Company has adopted this Statement of Company Policy Regarding Insider Trading (the “Policy”) both to satisfy the Company’s obligation to prevent insider trading and to help Company personnel avoid the severe consequences associated with violations of the insider trading laws. The Policy is also intended to prevent even the appearance of improper conduct on the part of anyone employed by or associated with the Company (not just the officers or directors of the Company). For clarity, this