Official Commercial Launch Marks Key Revenue-Growth Milestone

GCT Semiconductor Holding Inc. ("GCT" or the "Company") (NYSE:GCTS), a leading designer and supplier of advanced 5G and 4G semiconductor solutions, today announced the first commercial shipments of its 5G chipset to GCT's lead customers. The shipments follow successful qualification and adoption, as highlighted in GoGo's recent announcement, marking a key milestone in GCT's 5G revenue growth trajectory.

The recently announced launch of GoGo's 5G air-to-ground network further underscores the growing demand for GCT's 5G solutions and reinforces the Company's positioning for expanded 5G commercialization and continued market penetration in 2026 and the years ahead.

"The commercial launch of our 5G chipset marks a pivotal step forward for GCT and represents an important milestone in our ability to generate revenues from our 5G products," said John Schlaefer, CEO of GCT. "Customer response has been extremely encouraging, and we are seeing strong interest across multiple 5G applications. With partners like GoGo launching new 5G networks, we believe this is just the beginning of a significant growth cycle for our technology and business."

With the successful commercial launch, GCT completed its 2025GCT – Year of 5G program in line with the previously announced anticipated timeline, which guided for commercial shipments to commence at the end of Q4 of 2025.

Meet the GCT team at CES in Las Vegas, NV, this week. Contact us at marketing@gctsemi.com to schedule a meeting.

About GCT Semiconductor Holding, Inc.

GCT is a leading fabless designer and supplier of advanced 5G and 4G LTE semiconductor solutions. GCT's market-proven solutions have enabled fast and reliable 4G LTE connectivity to numerous commercial devices such as CPEs, mobile hotspots, routers, M2M applications and smartphones, etc., for the world's top wireless carriers. GCT's system-on-chip solutions integrate radio frequency, baseband modem and digital signal processing functions, therefore offering complete 4G and 5G platform solutions with small form factors, low power consumption, high performance, high reliability, and cost-effectiveness. For more information, visit www.gctsemi.com.

Cautionary Statement Regarding Forward-Looking Statements

This press release contains certain forward-looking statements within the meaning of the "safe harbor" provisions of the Private Securities Litigation Reform Act of 1955. These forward-looking statements include, without limitation, statements regarding delivery of 5G chipset, achievement of key milestones and growth trajectory, and the ability to generate revenue from 5G products. Words such as "believe," "project," "expect," "anticipate," "estimate," "intend," "strategy," "future," "opportunity," "plan," "may," "should," "will," "would," "will be," "will continue," "will likely result," and similar expressions are intended to identify such forward-looking statements. Forward-looking statements are predictions, projections and other statements about future events that are based on current expectations and assumptions and, as a result, are subject to significant risks and uncertainties that could cause the actual results to differ materially from the expected results. Most of these factors are outside the Company's control and are difficult to predict. Factors that may cause actual future events to differ materially from the expected results, include, but are not limited to: the ability of the Company to develop its 5G products and generate revenue; the ability of the Company to enter into and meet the obligations under partnership and collaboration agreements; the ability of the Company to grow and manage growth profitability and retain its key employees; the Company's financial and business performance, including the Company's financial projections and business metrics; changes in the Company's strategy, future operations, financial position, estimated revenues and losses, forecasts, projected costs, prospects and plans; the Company's inability to anticipate the future market demands and future needs of its customers; the impact of component shortages, suppliers' lack of production capacity, natural disasters or pandemics on the Company's sourcing operations and supply chain; the Company's future capital requirements and sources and uses of cash; the ability of the Company to raise sufficient capital to fund its operations; the ability to implement business plans, forecasts, and other expectations, including the growth of the 5G market; the risk that the Company may not be able to repay its debt; the risk of economic downturns that affects the Company's business operation and financial performance; the risk that the Company may not be able to develop and design its products acceptable to its customers; actual or potential conflicts of interest of the Company's management with its public stockholders; and other risks and uncertainties indicated from time to time in the Company's filings with SEC, including the Annual Report on Form 10-K for the fiscal year ended December 31, 2024 and those disclosures under the "Risk Factors" section therein. The foregoing list of factors is not exhaustive. Forward-looking statements speak only as of the date they are made. Readers are cautioned not to put undue reliance on forward-looking statements, and the Company assumes no obligation and does not intend to update or revise these forward-looking statements, whether as a result of new information, future events, or otherwise.

View source version on businesswire.com: https://www.businesswire.com/news/home/20260106379786/en/

Investor relations website: investors.gctsemi.com

Investor relations contact: Gateway Group, Ralf Esper, GCT@gateway-grp.com

Media contact: media@gctsemi.com

GCT Semiconductor Launches Commercial Shipments of 5G Chipset