Welcome to our dedicated page for UNITED MICROELECTRONICS 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.
Our SEC filing database is enhanced with expert analysis from Rhea-AI, providing insights into the potential impact of each filing on UNITED MICROELECTRONICS's stock performance. Each filing includes a concise AI-generated summary, sentiment and impact scores, and end-of-day stock performance data showing the actual market reaction. Navigate easily through different filing types including 10-K annual reports, 10-Q quarterly reports, 8-K current reports, proxy statements (DEF 14A), and Form 4 insider trading disclosures.
Designed for fundamental investors and regulatory compliance professionals, our page simplifies access to critical SEC filings. By combining real-time SEC filing updates, Rhea-AI's analytical insights, and historical stock performance data, we provide comprehensive visibility into UNITED MICROELECTRONICS's regulatory disclosures and financial reporting.
United Microelectronics Corporation reported steady March 2026 operating data. March net sales were NT$20,830,626 thousand, up 4.89% from March 2025. Year-to-date 2026 net sales reached NT$61,037,902 thousand, a 5.49% increase over the same period in 2025.
The company reported no funds lent to other parties and no endorsements or guarantees in March 2026. For financial derivatives, UMC had unwritten-off forward trading contracts with a notional amount of NT$1,118,250 thousand, a negative fair value of NT$11,945 thousand, a net loss from fair value of NT$11,292 thousand, and realized losses of NT$6,276 thousand on written-off forwards.
United Microelectronics Corporation filed a report explaining new U.S. disclosure requirements for its leaders. Due to the Holding Foreign Insiders Accountable Act, effective from March 18, 2026, the company’s directors and officers must publicly report their ownership of, and transactions in, UMC equity securities under Section 16(a) of the U.S. Securities Exchange Act of 1934.
These insider ownership and trading disclosures will be available on the U.S. SEC’s EDGAR website, giving investors a direct view into how key insiders hold and trade UMC stock.
UNITED MICROELECTRONICS CORP CFO & SVP Liu Chitung has filed an initial Form 3 reporting his ownership of UMC common shares. He reports 5,222,917 common shares held directly, including 1,210,000 Restricted Stock Awards that will vest annually on December 5 from 2026 to 2029.
He also reports indirect ownership of 150,000 common shares held by his spouse and 2,000,000 common shares held through CTBC Bank Trust, which is described as a trust with discretion reserved.
UNITED MICROELECTRONICS CORP director reports initial holdings. Director Wang Su-Lin has reported beneficial ownership of 101,000 Common Shares, held directly, with no specific buy or sell transactions disclosed. This Form 3 mainly establishes the director’s starting ownership position for future insider reporting.
UNITED MICROELECTRONICS CORP filed a Form 3 insider report for director Wu Ling-Ling. This filing identifies Wu as a board member and provides an initial disclosure of beneficial ownership status. The excerpt shows no reportable transactions or derivative positions and no specific share holdings listed.
UNITED MICROELECTRONICS CORP director Hsu Wen Hsin filed an initial Form 3, which is a statement of beneficial ownership for insiders. This filing reports no transactions in the company’s securities, and no derivative positions or holdings are listed in the available data.
UNITED MICROELECTRONICS CORP director Shiu Kuang-Si has filed an initial insider ownership report on Form 3. This filing establishes his status as a director and provides the starting point for tracking any future insider transactions or changes in his holdings in the company’s securities.
UNITED MICROELECTRONICS CORP director files initial ownership report
UNITED MICROELECTRONICS CORP director Shyu Jyuo-Min has filed a Form 3, which is an initial statement of beneficial ownership of securities. This filing establishes the director’s reporting status for future insider transactions but does not list any trades in this report.
United Microelectronics Corp filed an initial insider ownership report for Chen Lih-Juann, identifying this person as a director of the company. The Form 3 does not list any equity transactions, exercises, gifts, or other movements in United Microelectronics shares.
UNITED MICROELECTRONICS CORP director and President & COO Ming-Chih Hsu has filed an initial Form 3 reporting beneficial ownership of 8,403,220 common shares held directly. This total includes 1,777,700 shares of Restricted Stock Awards that are scheduled to vest annually on December 5 from 2026 through 2029.