Welcome to our dedicated page for GCT Semiconductor Holding SEC filings (Ticker: GCTS), a comprehensive resource for investors and traders seeking official regulatory documents including 10-K annual reports, 10-Q quarterly earnings, 8-K material events, and insider trading forms.
GCT Semiconductor Holding, Inc. filings document a fabless semiconductor issuer with NYSE-listed common stock and public warrants. Recent Form 8-K reports cover quarterly and annual financial results, 5G and 4G chipset licensing announcements, material definitive agreements, direct financial obligations and shareholder voting matters.
The company’s regulatory record includes disclosures on convertible promissory notes, warrant issuance agreements, a subsidiary loan facility, registered common-stock issuances and resale registration references. Governance filings report annual meeting results, director elections, auditor ratification and exchange-rule matters, while event reports identify the company’s Delaware corporate status and securities structure.
GCT Semiconductor Holding, Inc. reported net revenues of $1.9 million for the three months ended March 31, 2026, up sharply from $0.5 million a year earlier, driven by higher product and service revenue. Gross profit improved to $0.9 million, but the company still posted a net loss of $9.9 million, similar on a per‑share basis at $(0.15). Cash and cash equivalents rose to $7.2 million, mainly from financing activities, including $12.7 million of common stock sales under an at‑the‑market program and $2.8 million from Indigo convertible notes. Total liabilities were $96.3 million, with $52.7 million of borrowings and $5.0 million of convertible notes outstanding, leaving a stockholders’ deficit of $73.9 million and an accumulated deficit of $615.3 million. Management disclosed that recurring losses, negative operating cash flows, heavy near‑term debt maturities and dependence on additional fundraising raise substantial doubt about the company’s ability to continue as a going concern beyond twelve months.
GCT Semiconductor Holding, Inc. reported first quarter 2026 results with total net revenues of $1.9M, an increase of 287% year-over-year, driven by higher 5G product and service revenues. Product revenue was $0.47M and service revenue was $1.45M, producing gross profit of $0.95M.
The company recorded an operating loss of $6.1M and a net loss of $9.9M, or $(0.15) per share, similar on a per-share basis to the prior year. Management highlighted a roughly 58% sequential increase in 5G chipset shipments and emphasized plans to scale production and maintain financial flexibility.
Liquidity as of March 31, 2026 included cash and cash equivalents of $7.2M, net accounts receivable of $2.4M and inventory of $1.6M. Total assets were $22.4M against total liabilities of $96.3M, resulting in stockholders’ deficit of $73.9M.
TUDER JEFFREY reported acquisition or exercise transactions in this Form 4 filing.
GCT Semiconductor Holding, Inc. director Jeffrey Tuder reported an equity compensation grant of 24,122 shares of Common Stock through Restricted Stock Units (RSUs) at no cash cost per share. The award size was set by dividing $27,500 by the $1.14 fair market value on March 31, 2026.
The RSUs will vest on March 31, 2026, if he continues serving through that date and will be settled in Common Stock under his deferral election. Following this grant, Tuder directly holds 141,931 shares of Common Stock.
Lee Kyeongho reported acquisition or exercise transactions in this Form 4 filing.
GCT Semiconductor Holding, Inc. reported that Chairman and Class III Director Lee Kyeongho received a grant of 24,122 shares of Common Stock as a stock award. The award stems from Restricted Stock Units, each representing one share of common stock after vesting.
The number of RSUs was set by dividing $27,500 by the fair market value of the common stock, which was $1.14 per share on March 31, 2026, rounded down to the nearest whole share. These RSUs vest on March 31, 2026, subject to continued service, and are payable in common stock under a deferral election. Following this grant, Lee directly owns 1,086,863 shares of common stock.
GCT Semiconductor Holding, Inc. director Chan Nelson reported an award of 24,122 shares of Common Stock as restricted stock units. The grant, valued at $27,500, was calculated by dividing that amount by the fair market value of $1.14 per share on March 31, 2026.
Each RSU converts into one share of common stock after vesting. The RSUs vest on March 31, 2026, subject to continued service through that date. Following this award, Nelson directly holds 125,642 shares of the company’s Common Stock.
Chun Kukjin reported acquisition or exercise transactions in this Form 4 filing.
GCT Semiconductor Holding, Inc. director Chun Kukjin received a grant of 24,122 shares of common stock as a stock award, recorded at a price of $0.00 per share. Following this award, his direct holdings total 89,377 common shares.
The award is structured as Restricted Stock Units, each representing one share of common stock after vesting. The number of RSUs for this quarter was set by dividing $27,500 by the fair market value of $1.14 per share on March 31, 2026, rounded down, and will vest on March 31, 2026, subject to continued service.
GCT Semiconductor Holding, Inc. director Robert Barker received an equity award of 24,122 shares of common stock in the form of restricted stock units at no cash cost per share. Each RSU converts into one share of common stock after vesting.
The RSUs are scheduled to vest on March 31, 2026, subject to Mr. Barker’s continued service. The award size is based on dividing $27,500 by the fair market value per share of $1.14 on March 31, 2026, rounded down. Following this grant, he directly holds 142,451 shares.
Shin Hyunsoo reported acquisition or exercise transactions in this Form 4 filing.
GCT Semiconductor Holding, Inc. director Hyunsoo Shin reported receiving a grant of 24,122 Restricted Stock Units (RSUs) of common stock on March 31, 2026 as equity compensation under the GCT 2024 Omnibus Incentive Compensation Plan. Each RSU represents one share of common stock after vesting, with no cash price paid for the award.
The number of RSUs was determined by dividing $27,500 by the fair market value per share of common stock, which was $1.14 on March 31, 2026, then rounding down to the nearest whole share. These RSUs vest on March 31, 2026, subject to continued service. Following this grant, Shin holds 804,809 shares of common stock directly.
GCT Semiconductor Holding, Inc. is registering up to $20,000,000 aggregate principal amount of interest-free mandatory convertible promissory notes (the “Convertible Notes”) and the common stock issuable upon conversion. The notes may be issued in tranches up to $500,000 each at 96.5% of principal, mature 24 months after issuance and convert at a price equal to 95% of the three‑day VWAP prior to conversion, subject to a 4.99% beneficial ownership cap (up to 9.99% with notice) and NYSE exchange‑approval limits. The company may redeem notes for cash after 12 months with a premium (7% if redeemed between 12–18 months; 14% thereafter). GCT must maintain an authorized reserve of at least 200% of shares issuable on full conversion. The offering proceeds (net ≈ $18.7M) are intended for working capital, general corporate purposes and repayment of certain indebtedness.
GCT Semiconductor Holding, Inc. is a fabless semiconductor company focused on 4G and 5G modem and RF chipsets for fixed wireless access (FWA), mobile broadband and IoT. It designs in California and develops mainly in South Korea, selling through OEMs and ODMs worldwide.
The company began first commercial shipments of its 5G chipset in the fourth quarter of 2025 and expects average selling prices for 5G to be approximately four times those of its 4G products, which it believes can support higher revenue and gross margins. It plans additional 5G solutions for FWA, satellite, vehicle connectivity and RedCap IoT.
GCT highlights competitive strengths in multi-antenna modem technology, long-standing relationships with major operators, and a portfolio of 4G and 5G system-on-chips. Key risks include a history of losses, significant ongoing capital needs, dependence on a small number of customers, reliance on foundry partners such as Samsung and UMC, intense competition from larger rivals, and uncertainty around the pace of 5G and FWA adoption.