Welcome to our dedicated page for United Microelec SEC filings (Ticker: UMC), 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.
United Microelectronics Corporation (UMC) (NYSE: UMC; TWSE: 2303) is a foreign private issuer that reports to the U.S. Securities and Exchange Commission primarily through Form 20-F and Form 6-K filings. These documents provide detailed information on the company’s semiconductor foundry operations, financial performance, risk factors, and material events. UMC’s recent SEC activity includes a series of Form 6-K current reports, each signed on behalf of the company and referencing attached exhibits with additional disclosures.
On this page, Stock Titan aggregates UMC’s SEC filings, including annual reports on Form 20-F, which typically contain audited financial statements, descriptions of the business, technology platforms, geographic footprint, and governance information. Form 6-K submissions are used to furnish interim updates such as operating results, monthly sales data, and other announcements that UMC also releases through news wires.
Investors can use these filings to analyze topics such as wafer capacity, revenue by region and application, customer mix between fabless companies and IDMs, and the company’s capital expenditures and cash flow. Regulatory documents may also discuss UMC’s quality certifications, climate-related commitments, and other operational considerations relevant to its role as a global semiconductor foundry.
Stock Titan enhances access to UMC’s regulatory history by pairing real-time updates from EDGAR with AI-powered summaries that explain the key points of lengthy filings. Users can quickly understand the implications of a new 6-K or annual 20-F without reading every line, while still having direct access to the original documents for deeper review.
United Microelectronics Corporation filed a Form 6-K covering several corporate updates. Its major subsidiary United Semiconductor (Xiamen) Co., Ltd. held a shareholders’ meeting on 2026/03/12, approving the 2025 annual audited financial report and the 2026 annual operating budget, and amending its asset acquisition and disposal procedures.
UMC also completed a small capital reduction related to cancellation of restricted stock awards. Paid-in capital decreased from NT$125,881,563,440 to NT$125,785,246,190, and shares outstanding fell from 12,588,156,344 to 12,578,524,619. Book value per share rose slightly from NT$30.17 to NT$30.19.
The filing notes changes in insider holdings: Senior Vice President Chitung Liu held 4,661,917 UMC common shares as of January 31, 2026 and 4,612,917 shares as of February 28, 2026, a decrease of 49,000 shares. No pledges or releases of pledges were reported for directors, executive officers, or 10% shareholders over the same period.
United Microelectronics Corporation reported February 2026 net sales of NT$ 19,345,126 thousand, up 6.33% from NT$ 18,193,515 thousand a year earlier. Year-to-date 2026 net sales reached NT$ 40,207,276 thousand, a 5.81% increase over NT$ 38,000,310 thousand in 2025.
The company reported no funds lent to other parties and no endorsements or guarantees for February 2026. In financial derivatives, unwritten-off forward contracts totaled NT$ 685,740 thousand with a fair value of NT$ 8,522 thousand and net profit from fair value of NT$ 9,176 thousand, alongside realized loss of NT$ 2,510 thousand on written-off forwards of NT$ 1,008,616 thousand.
UMC also plans to attend the “2026 Taiwan Corporate Day” hosted by Citi on March 9–10, 2026, and the “Taiwan CEO-CFO Conference” hosted by J.P. Morgan on March 11–12, 2026, both in Taipei.
United Microelectronics Corporation filed its audited consolidated financial statements for 2025, showing stable scale but lower profitability versus 2024. Operating revenues in 2025 were
Net income attributable to shareholders of the parent was
The company generated strong cash flows from operations of
United Microelectronics Corporation reported its 2025 results and a series of major board decisions. Consolidated revenue reached
The company approved acquisition of machinery and equipment from ASML Singapore for
United Microelectronics Corporation filed a Form 6-K detailing several board actions involving its subsidiaries and governance. The board of major subsidiary United Semiconductor (Xiamen) Co., Ltd. approved convening a 2026 shareholders’ meeting on March 12, 2026 in Xiamen, China, to acknowledge its 2025 annual audited financial report and 2026 operating budget and to discuss amendments to its asset acquisition and disposal procedures.
Separately, the board resolved that subsidiary UMC GROUP (USA) will not distribute dividends, retaining remaining surplus as working capital based on an audit report. The filing also notes a governance change: Hsun Chieh Investment Co., Ltd., a juristic-person director, replaced its representative on UMC’s board, appointing Ming Hsu, Executive Vice President of UMC, to succeed former representative director SC Chien, effective February 24, 2026.
United Microelectronics Corporation filed a Form 6-K providing corporate schedule and insider ownership updates. The company announced that its board of directors is expected to meet on February 25, 2026 to review and approve the 2025 financial reports. The notice for this board meeting was issued on February 13, 2026. The filing also reports insider shareholdings for January 2026, showing that independent director Su Lin Wang held 101,000 UMC shares as of January 31, 2026, up from zero at December 31, 2025. No pledges or releases of pledges on UMC common shares by directors, executive officers, or 10% shareholders were reported for this period.
United Microelectronics Corporation reports that January 2026 net sales were NT$20,862,150 thousand, up from NT$19,806,795 thousand in January 2025, a 5.33% increase. Year-to-date net sales figures match January, reflecting the same 5.33% growth.
The company reports no funds lent to other parties and no endorsements or guarantees for January 2026. In financial derivatives not designated for hedging, UMC held forward contracts with an unwritten-off notional amount of NT$565,380 thousand, a fair value of NT$3,920 thousand, and a net profit from fair value changes of NT$4,574 thousand. Written-off forward contracts totaled NT$691,840 thousand with a realized loss of NT$3,346 thousand.
United Microelectronics Corporation reported solid fourth quarter 2025 results, with consolidated revenue of NT$61.81 billion (US$1.97 billion), up 4.5% from 3Q25 and 2.4% year-on-year. Gross margin was 30.7% and operating margin was 19.8%, reflecting healthy profitability.
Net income attributable to shareholders was NT$10.06 billion (US$320 million), with earnings per share of NT$0.81 and earnings per ADS of US$0.129. For 2025, earnings per share reached NT$3.34. Revenue from 22/28nm technology accounted for 36% of Q4 revenue, while 22nm revenue alone rose 31% quarter-on-quarter and hit a record high, exceeding 13% of total quarterly revenue.
Wafer shipments for 2025 increased 12.3% and revenue in US dollars grew 5.3% year-on-year. Management expects wafer demand to remain firm and views 2026 as another growth year, supported by expanding 22nm platforms, new technology solutions, capacity investments in Singapore, U.S. partnerships, and a 2026 CAPEX plan of US$1.5 billion. First-quarter 2026 guidance calls for flat wafer shipments, firm U.S. dollar ASP, gross margin in the high-20% range, and capacity utilization in the mid-70% range.