GCT Semiconductor Holding, Inc. Provides Business Update and Reports Second Quarter 2026 Financial Results

5G Chipset Shipments in Q2 2026 Increased Approximately 71% Sequentially

SAN JOSE, CA – August 10, 2026 – GCT Semiconductor Holding, Inc. (“GCT” or the “Company”) (NYSE: GCTS), a leading designer and supplier of 5G semiconductors powering the AI data pipeline with wireless connectivity, today provided an update on business developments and reported financial results for the second quarter ended June 30, 2026.

Scaling the 5G Opportunity Toward Broad Commercial Ramp

Development, integration, certification and sales activities continued progressing across GCT’s 5G customer pipeline. Although customer restructuring and evolving deployment schedules shifted the timing of certain launches, customer engagement and underlying demand remain strong, culminating in the shipment of over 5,100 5G chipsets during Q2, reinforcing the expected commercial ramp across GCT’s three strategic growth markets:

“We made continued progress during the second quarter as we advanced our 5G semiconductor platform across three key growth areas: terrestrial broadband, satellite and non-terrestrial connectivity, and IoT and specialized networks,” said John Schlaefer, CEO of GCT. “5G chipset shipments increased approximately 71% sequentially from last quarter as we continued supporting customer programs across a broad range of applications, including fixed wireless access, satellite connectivity, private networks, industrial IoT and other specialized connectivity solutions. We also expanded into new connectivity markets through a recent strategic collaboration, leveraging GCT’s IoT technology and module capabilities to support UAV control and communications applications across commercial and defense-related use cases. This collaboration highlights the versatility of our technology platform and our ability to address an expanding range of connectivity needs.”

Schlaefer added, “While broader market dynamics, including industry consolidation, restructuring activities and shifting customer deployment schedules, have impacted the timing of certain programs, we remain encouraged by the strength of our customer engagement and expanding opportunity pipeline. As we look ahead, we remain focused on advancing customer programs toward commercialization and believe the breadth of our 5G platform, growing ecosystem of partnerships and diversified market opportunities position GCT well to capitalize on the significant long-term growth opportunities across 5G connectivity markets.  With these developments, we now have greater visibility and are building the demand for our 5G products across multiple fronts.”

Second Quarter 2026 Financial Results

Results compare the 2026 fiscal second quarter ended June 30, 2026, to the 2025 fiscal second quarter ended June 30, 2025.

“Our reported second-quarter net loss was significantly impacted by a $12.3 million non-cash loss related to the change in the fair value of common stock warrant liabilities, driven by increases in our common stock price and the market price of our publicly traded warrants during the quarter, and therefore, was not reflective of our underlying operating performance,” said Edmond Cheng, CFO of GCT. “Hence, starting this quarter, we are introducing Adjusted EBITDA to provide greater visibility into our core operating performance, demonstrating that we have stabilized underlying performance while continuing to invest in customer programs and production readiness. With the commercialization of 5G chipsets, the revenue for the first half of this year slightly exceeds the full year of 2025, and we are confident that our revenue will grow this year compared to the previous years. Also, with $30.2 million of cash on our balance sheet at quarter-end, we have the financial flexibility and resources to support commercial ramp of our customer programs and by now have already secured the required production capacity for the remainder of 2026 and through the first quarter of 2027 in anticipation of the expected chip demand.”

Liquidity

The Company's existing sources of liquidity as of June 30, 2026, include cash and cash equivalents of $30.2 million, net accounts receivable of $1.1 million, and inventory of $1.5 million. GCT currently has an effective universal shelf registration statement on Form S-3 that allows the Company to raise up to $200.0 million through the issuance of securities, including $75.0 million for an at-market (“ATM”) agreement. During the quarter ended June 30, 2026,

while the total shelf registration maximum remains unchanged at $200.0 million, GCT amended the ATM Agreement to increase the allowed maximum aggregate offering amount from $75.0 million to $120.0 million.

5G Outlook

The Company continues to expect aggregate 5G shipments in the second half of 2026 to exceed first-half levels.

Conference Call

The Company will hold a conference call and live webcast at 4:30 p.m. ET or 1:30 p.m. PST, which will be open to the public. During the conference call, the Company will discuss business updates and review the financial results, followed by a Q&A period.

Date: Monday, August 10, 2026

Time: 4:30 p.m. Eastern time (1:30 p.m. Pacific time)

About GCT Semiconductor Holding, Inc.

GCT is a leading fabless designer and supplier of 5G, 4G LTE and satellite semiconductor solutions powering the AI data pipeline and enabling advanced wireless connectivity. GCT's market-proven solutions are optimized to enable fast and reliable connectivity to devices such as CPEs, mobile hotspots, routers, M2M applications, smartphones, etc., including for edge computing and direct-to-device applications, for the world's top wireless carriers including satellite connectivity providers and terrestrial mobile operators. GCT is committed to delivering the high performance, low latency wireless technologies that form the backbone of the AI edge data pipeline. GCT's system-on-chip solutions integrate radio frequency, baseband modem and digital signal processing functions, therefore offering complete platform solutions with small form factors, low power consumption, high performance, high reliability, and cost-effectiveness.

In computing, EBITDA, we start with net loss and exclude interest expense, interest income, income taxes and depreciation and amortization expenses. In computing Adjusted EBITDA, we start with EBITDA and exclude the following: stock-based compensation, gain/loss on foreign currency transactions, net, change in fair value of common stock forward liability, change in fair value of warrant liabilities and change in fair value of convertible promissory notes.

Management uses EBITDA and Adjusted EBITDA for business planning purposes, including managing our business against internally projected results of operations and measuring our performance. GCT’s management believes that these non-GAAP measures provide useful supplemental information to investors regarding the Company’s ongoing operations by eliminating certain items that are not directly related to ongoing operations or impact the generation of current or future revenues, such as non-cash expenses. Additionally, because of varying available valuation methodologies and subjective assumptions that can impact a company’s non-cash operating expenses, we believe that providing non-GAAP financial measures that primarily excludes non-cash expense allows for meaningful comparisons of our core business operating results and those of other companies, as well as providing us with an important tool for financial and operational decision making and for evaluating our own core business operating results over different periods of time. Management considers these types of expenses and adjustments, to a great extent, to be unpredictable and dependent on a considerable number of factors that are outside of our control and are not necessarily reflective of operational performance during a period.

These non-GAAP results should not be considered an alternative to, or a substitute for, GAAP financial information, and may differ from similarly titled non-GAAP measures used by other companies. GCT has included these non-GAAP measures to give investors an opportunity to see the Company’s financial results as viewed by management. A reconciliation of the comparable GAAP financial measures to the non-GAAP financial measures is provided at the end of the Company’s unaudited consolidated financial statements presented below.

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, the Company’s expectations with respect to 5G chip shipment for the remainder of 206; expansion into connectivity market; the 5G outlook and anticipated growth of 5G markets and opportunities; collaboration with strategic partners; the ability for the Company to improve financial performance; the ability of the Company to raise sufficient capital to fund its operations; the ability of the Company’s technology and products to address new markets and meet customer demands; the execution of go-to-market strategies; and the anticipated size of addressable markets by the Company’s 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 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 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; macroeconomic conditions, including market conditions, global and economic conditions, labor disputes, inflationary impacts, and disruptions to the global supply chain; the imposition of duties and tariffs and other trade barriers and retaliatory countermeasures implemented by the U.S. and other governments; and other risks and uncertainties indicated from time to time in Company’s filings with the Securities and Exchange Commission (“SEC”), including the annual report on Form 10-K for the fiscal year ended December 31, 2025, and quarterly reports on Form 10-Q, 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.

Contacts:

(unaudited, in thousands)