GCT Semiconductor Holding Inc (NASDAQ: GCTS) is a fabless semiconductor company that designs baseband modems, RF chipsets, and protocol software for 4G LTE and 5G wireless broadband applications. Revenue is generated through product sales of integrated chipset solutions to OEMs, ODMs, and network operators serving fixed wireless access (FWA), mobile routers, and related broadband devices. GCTS competes directly against Qualcomm and MediaTek in the high-speed 4G and 5G wireless broadband chipset market, with HiSilicon and Sequans present in lower-end segments. The company holds relationships with Tier 1 and Tier 2 network operators across the United States, Europe, and Asia, some spanning over a decade. As a fabless company, GCTS relies entirely on third-party foundries, including United Microelectronics Corporation, Samsung, and Taiwan Semiconductor Manufacturing Corporation, for wafer production. In February 2024, GCTS entered a three-year Foundry Product Development Agreement with Alpha Holdings Co., Ltd. at a total cost of approximately $7.6 million, targeting 5G product development using Samsung foundry capacity.

Revenue model

Transactional product sales of integrated RF and baseband chipsets to OEMs, ODMs, and network operators. No formal foundry agreements guarantee minimum manufacturing capacity. Development cost obligations include approximately $7.6 million under the Alpha Agreements (executed February 2024, three-year term).

Products and services

Baseband modems, RF chipsets, and protocol software for 4G LTE (including CAT1/4 products GDM7243S, GDM7243ST, GDM7243SL), 4.5G, 4.75G, and 5G wireless broadband. 5G product portfolio spans Sub-6GHz (FR1) and mmWave (FR2) configurations, with peak downlink throughput up to 6.5Gbps (FR2). Proprietary multi-antenna technology includes an eight-antenna LTE solution and Multi-Antenna Modem with interference cancellation. Products target FWA CPE, mobile routers, and wireless modules.

Customers and end markets

Tier 1 and Tier 2 network operators in the United States, Europe, and Asia. OEMs and ODMs serving network operators. End markets include fixed wireless access (FWA) broadband, mobile routers, and wireless modules. Some customers have directly funded and contributed to GCTS's 5G product roadmap.

Value-chain role

Fabless semiconductor designer. Outsources all wafer fabrication to third-party foundries including United Microelectronics Corporation, Samsung, and Taiwan Semiconductor Manufacturing Corporation. Licenses third-party IP for 5G development via Vendor Agreements (February 2024) and the Samsung Agreement (July 2020). Supplies chipsets upstream to OEMs and ODMs, who in turn supply network operators.

Geographic exposure

Customer relationships span the United States, Europe, and Asia. Manufacturing performed at external foundries including Samsung (South Korea) and TSMC and UMC (Taiwan). No specific revenue breakdown by geography provided in the excerpts.

Competitors

Qualcomm, MediaTek, HiSilicon, Sequans, Samsung LSI

Source: SEC 10-K, filed 2026-03-25

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