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 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.
UNITED MICROELECTRONICS CORP director and Chief Executive Officer Jason Shi Wang filed a Form 3 reporting beneficial ownership of 32,655,440 common shares. This filing establishes his reported equity position as an insider.
The reported holdings include 14,200,000 common shares pledged as collateral to secure certain obligations and 3,515,400 shares subject to Restricted Stock Awards. A specified number of these RSA shares are scheduled to vest annually on December 5 from 2026 through 2029.
UNITED MICROELECTRONICS CORP director Hung Chia-Tsung has filed an initial ownership report showing substantial common share holdings. He reports direct ownership of 63,241,892 common shares, which includes 3,515,400 shares of Restricted Stock Awards that are scheduled to vest annually on December 5 from 2026 to 2029.
He also reports indirect ownership of 1,269,435 common shares held by his spouse. This Form 3 does not reflect new buying or selling activity; it establishes Hung’s current equity position in the company as he serves as Chairman and Chief Strategy Officer.
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.