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 filings document the company’s reporting as a foreign issuer with U.S.-listed securities, including Form 20-F annual reporting and Form 6-K current reports. The filings cover consolidated financial statements, monthly sales volume, quarterly operating results, accounting differences between TIFRSs and IFRS Accounting Standards issued by the IASB, and disclosures on funds lent, endorsements and guarantees, and derivative transactions.
UMC’s regulatory documents also record board and governance actions, capital budget execution, share repurchase programs, cancellation of restricted employee share awards, and trading or pledging of common shares by directors, executive officers, and 10% shareholders. These filings tie the company’s semiconductor foundry business to formal disclosures on capital structure, financial reporting, ownership activity, and corporate approvals.
UNITED MICROELECTRONICS CORP senior vice president Oliver Chang filed an initial Form 3 showing direct ownership of 4,819,289 Common Shares. This holding includes 1,270,000 shares of Restricted Stock Award (RSA), with a specified portion scheduled to vest each year on December 5 from 2026 through 2029. The filing records Chang’s starting equity position as an officer rather than any new share purchase or sale.
UNITED MICROELECTRONICS CORP senior vice president Hung Kuei-Chun filed an initial Form 3 detailing existing ownership in the company’s common shares. The filing shows 3,879,566 shares held directly and 2,000,000 shares held indirectly through CTBC Bank Trust. Footnotes explain that 1,127,500 of the direct shares are Restricted Stock Awards that will vest annually on December 5 from 2026 to 2029, and that the indirect shares are held under a Trust with Discretion Reserved.
UNITED MICROELECTRONICS CORP executive Wu Chung-Hsien has filed an initial ownership report showing substantial common share holdings. The filing lists 3,685,584 common shares held directly and 304 shares held indirectly through a spouse. A footnote states that 1,127,500 of these shares are a Restricted Stock Award that will vest in specified amounts each year on December 5 from 2026 to 2029, indicating a multi‑year equity compensation schedule tied to continued service.
United Microelectronics Corporation reported that its ongoing share repurchase program has now exceeded NTD$300 million in total value. As of 2026/05/07, the company has repurchased 4,166,000 common shares for a total of NTD$375,536,827 at an average price of NTD$90.14 per share.
These repurchased shares represent 0.03% of the company’s total issued shares, indicating a relatively small buyback in proportion to overall share capital.
United Microelectronics Corporation explains how its 2025 consolidated results differ under Taiwan-endorsed TIFRSs versus IFRS Accounting Standards issued by the IASB for its overseas securities.
Under TIFRSs, net income attributable to shareholders was NT$41,716,249 thousand with basic EPS of NT$3.34 and diluted EPS of NT$3.31, total assets of NT$578,996,009 thousand, total liabilities of NT$199,140,569 thousand, and equity attributable to the parent company of NT$379,768,265 thousand. Under IFRS Accounting Standards, net income attributable to shareholders was NT$40,360,314 thousand with basic EPS of NT$3.30 and diluted EPS of NT$3.27, total assets of NT$567,274,863 thousand, total liabilities of NT$201,362,691 thousand, and equity attributable to the parent company of NT$365,824,997 thousand. The company states that the main reasons for the differences are the timing of recognizing additional income tax on unappropriated earnings and the accounting treatment of treasury stock.
United Microelectronics Corporation files its Form 20-F annual report for the year ended December 31, 2025, with 12,588,156,344 common shares outstanding as of that date. The report defines key terms, explains its ADS structure and accounting frameworks, and outlines extensive risk factors.
Management highlights cyclical semiconductor demand, overcapacity, customer concentration, complex manufacturing, supply-chain dependence, climate and carbon-cost pressures, and geopolitical tensions involving the U.S., China and Taiwan. The filing also describes a 12nm process collaboration with Intel, recent U.S. tariff actions, new export controls, cyber and ESH risks, and evolving global tax rules affecting future profitability.
BlackRock, Inc. filed an amended Schedule 13G/A reporting beneficial ownership of 817,485,069 shares of United Microelectronics Corp common stock, representing 6.5% of the class. The filing shows sole voting power for 771,583,164 shares and sole dispositive power for 817,485,069 shares.
The filing is signed by a Managing Director and includes Exhibit 24 (Power of Attorney) and Exhibit 99 (Item 7 information). The filing states the holdings reflect aggregated Reporting Business Units of BlackRock, Inc.
United Microelectronics Corporation (UMC) reported consolidated Q1 2026 revenue of NT$61.0 billion, up from NT$57.9 billion a year earlier, driven mainly by wafer sales. Gross profit rose to NT$17.8 billion, and operating income increased to NT$11.3 billion from NT$9.8 billion.
Net income more than doubled to NT$16.1 billion versus NT$7.7 billion in Q1 2025, helped by NT$2.8 billion of profit from associates and joint ventures and NT$2.1 billion of fair value gains. Basic and diluted earnings per share were NT$1.29, up from NT$0.62. Operating cash flow was NT$22.0 billion, with significant ongoing capital expenditure of NT$12.5 billion.
United Microelectronics Corporation reported first quarter 2026 consolidated revenue of NT$61.04 billion, up 5.5% year-on-year and down 1.2% from the prior quarter. Gross margin was 29.2%, with net income attributable to shareholders of NT$16.17 billion and basic earnings per share of NT$1.29.
Technology mix and utilization remained healthy, with 22/28nm accounting for 34% of revenue, 22nm alone contributing 14%, and capacity utilization at 79%. The board approved the Q1 2026 financial statements, a capital budget of NT$4.683 billion for capacity deployment, and a small capital reduction by cancelling 1,539,749 unvested employee restricted shares (0.0122% of capital).
The board also authorized a share repurchase program of up to 50,000,000 common shares, or 0.40% of issued shares, between April 30 and June 29, 2026, with a price range of NT$52.50 to NT$109.50 and a monetary ceiling of NT$212,951,478 thousand, to be transferred to employees. For second quarter 2026, UMC guides to high single-digit growth in wafer shipments, a low single-digit increase in average selling prices in USD, gross margin around 30%, low-80% capacity utilization, and 2026 capital expenditures of US$1.5 billion.
United Microelectronics Corporation filed a Form 6-K to announce scheduling details for its first-quarter 2026 financial reporting. The company’s board of directors was formally notified on 2026/04/21 of an upcoming meeting.
The board meeting is expected to be held on 2026/04/29 to review and approve the Q1 2026 consolidated financial report. No financial results or performance figures are included in this filing; it only provides the timetable for the board’s consideration of the quarterly report.