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 reports April 2026 net sales and related treasury activities. April 2026 net sales were NT$22,663,945 thousand, up from NT$20,454,530 thousand in April 2025, an increase of 10.80%. Year-to-date net sales reached NT$83,701,847 thousand versus NT$78,313,487 thousand a year earlier, a 6.88% rise.
The company reports no funds lent to other parties and no endorsements or guarantees for April 2026. In financial derivative transactions not under hedging accounting, UMC held forwards with unwritten-off trading contracts of NT$1,328,040 thousand, showing a fair value loss of NT$5,456 thousand and a realized loss of NT$1,724 thousand.
UNITED MICROELECTRONICS CORP Vice President Tan Wen Yi filed an initial Form 3 reporting holdings of 650,600 common shares. This filing does not show a new buy or sell; it establishes current beneficial ownership. A footnote explains that 594,500 of these shares are in the form of Restricted Stock Awards (RSAs).
A specified number of the RSA shares will vest each year on December 5 from 2026 through 2029, meaning portions of this equity grant will gradually become fully owned over that period.
UNITED MICROELECTRONICS CORP Vice President Lu Chia-Ao reports holdings of 170,000 common shares. These shares are described as a Restricted Stock Award, with specified portions scheduled to vest each year on December 5 from 2026 through 2029.
UNITED MICROELECTRONICS CORP executive Liao Ching Yu, General Counsel & VP, filed an initial Form 3 reporting current ownership in the company’s common shares. The filing shows direct holdings of 732,480 common shares.
The position includes 700,800 shares of Restricted Stock Awards (RSA), with a specified number of these RSAs scheduled to vest annually on December 5 from 2026 through 2029. This Form 3 records existing beneficial ownership and does not report any recent share purchases or sales.
UNITED MICROELECTRONICS CORP executive CHEN JIN-SHUANG, the company’s CHRO & VP, has reported initial ownership of 2,343,080 Common Shares on a Form 3. This total includes 828,800 shares of Restricted Stock Awards (RSA), with specified portions scheduled to vest each December 5 from 2026 through 2029.
United Microelectronics Corp Vice President Kuo Lin-Wu has filed an initial ownership report showing a substantial equity stake in the company. The filing lists direct ownership of 913,080 common shares. This total includes 808,800 shares granted as a Restricted Stock Award that will vest in stages each December 5 from 2026 through 2029.
UNITED MICROELECTRONICS CORP vice president Lin Ming-Yu filed an initial ownership report detailing holdings of the company’s common shares. The filing shows 3,543,005 shares held directly and 781,408 shares held indirectly through a spouse. A footnote states the position includes 828,800 Restricted Stock Award shares that will vest annually on December 5 from 2026 to 2029.
UNITED MICROELECTRONICS CORP vice president Hsu Shu-Fen has filed an initial Form 3 reporting existing share ownership. The filing shows direct ownership of 1,560,080 Common Shares and indirect ownership of 7,000 Common Shares held by a spouse.
The reported holdings include 828,800 shares of a Restricted Stock Award, with a specified number of those shares scheduled to vest annually on December 5 from 2026 through 2029.
UNITED MICROELECTRONICS CORP Vice President LIU SHIH-WEI has reported initial share holdings. The filing shows direct ownership of 2,183,080 common shares. This includes 1,296,000 shares pledged as collateral for certain obligations and 828,800 shares granted as Restricted Stock Awards that will vest annually on December 5 from 2026 to 2029.
UNITED MICROELECTRONICS CORP vice president SHEN YING-SHENG filed an initial statement of beneficial ownership. The filing reports direct ownership of 1,313,080 Common Shares, establishing the executive’s starting equity position as an insider.
The holding includes 848,800 shares of Restricted Stock Award (RSA), with a specified number of these RSA shares scheduled to vest annually on December 5 from 2026 through 2029. The filing does not show any new purchase or sale, only existing holdings and future vesting terms.