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 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.
United Microelectronics Corporation filed an update covering two main items. First, the company will hold its Q1 2026 investor conference on April 29, 2026 at 17:00 via an online teleconference to discuss Q1 2026 financial and operating results.
Second, the report lists March 2026 shareholding changes for several senior executives and a 10% shareholder, showing modest reductions in their UMC common share holdings compared with February 28, 2026, and notes that there were no new share pledges or pledge releases during the period.
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.