Company Description
GCT Semiconductor Holding, Inc., a fabless semiconductor company, designs, manufactures, and sells communication semiconductors for industrial, business-to-business, and consumer applications in the United States, Taiwan, China, Germany, and South Korea.
The company offers wireless communication technologies, such as 5G/5.75G/4.5G/4G transceivers and modems; RF and modem chipsets based on fourth-generation (4G) long term evolution (LTE) technology, including 4G LTE, 4.5G LTE Advanced, and 4.75G LTE Advanced-Pro; baseband modem solutions, RF transceivers, and system-on-chip (SoC) solutions; and product design and support, warranty development, customer support, and technical support services.
It also develops and sells cellular Internet of Things (IoT) chipsets for low-speed mobile networks, such as eMTC/NB-IOT/Sigfox, and other network protocols; and 5G NR chipsets and other 5G NR solutions.
The company’s products and solutions are used in portable wireless routers, indoor and outdoor fixed wireless routers, industrial machine-to-machine applications, smartphones, fixed wireless subscriber terminals, various communication modules and devices, and industrial products.
It sells its products directly or indirectly through distributors to wireless operators, original equipment manufacturers (OEMs), and original design manufacturers (ODMs) in Taiwan, China, Korea, Japan, Europe, North America, and South America.
GCT Semiconductor Holding, Inc. was founded in 1998 and is headquartered in San Jose, California.
| Country | United States |
| Founded | 1998 |
| Industry | Semiconductors |
| Sector | Technology |
| Employees | 121 |
| CEO | John Schlaefer |
Contact Details
Address: 2290 North 1st Street, Suite 201 San Jose, California 95131 United States | |
| Phone | 408 434 6040 |
| Website | gctsemi.com |
Stock Details
| Ticker Symbol | GCTS |
| Exchange | NYSE |
| Stock Type | Common Stock |
| Fiscal Year | January - December |
| Reporting Currency | USD |
| CIK Code | 1851961 |
| CUSIP Number | 36170N107 |
| ISIN Number | US36170N1072 |
| Employer ID | 86-2171699 |
| SIC Code | 3674 |
Key Executives
| Name | Position |
|---|---|
| John Brian Schlaefer | President, Chief Executive Officer and Director |
| Dr. Kyeongho Lee Ph.D. | Co-Founder and Independent Chairman |
| Fong Ting Cheng | Chief Financial Officer |
| Alex Sum | Senior Vice President of Sales and Marketing |
| Dr. Jeongmin Kim Ph.D. | Chief Technology Officer and Vice President of Engineering |
Latest SEC Filings
| Date | Type | Title |
|---|---|---|
| Mar 30, 2026 | 424B5 | Filing |
| Mar 25, 2026 | 10-K | Annual Report |
| Mar 25, 2026 | 8-K | Current Report |
| Mar 2, 2026 | 424B5 | Filing |
| Feb 25, 2026 | 8-K | Current Report |
| Feb 13, 2026 | SCHEDULE 13G/A | Filing |
| Jan 29, 2026 | 8-K | Current Report |
| Dec 15, 2025 | 424B5 | Filing |
| Dec 15, 2025 | 8-K | Current Report |
| Nov 12, 2025 | 8-K | Current Report |