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 Corporation reported updated figures for its ongoing share repurchase program. As of 2026/05/12, the company had most recently repurchased 1,919,000 common shares for a total of NTD$194,882,342, at an average price of NTD$101.55 per share. During the overall repurchase period, UMC held a cumulative total of 10,251,000 of its own shares, representing 0.08% of the company’s issued shares.
United Microelectronics Corporation reports recent progress in its share repurchase program and insider share activity. As of 2026/05/11, the company had most recently repurchased 4,166,000 common shares for a total of NTD$391,855,237, at an average price of NTD$94.06 per share. During the repurchase period, UMC held a cumulative 8,332,000 of its own shares, equal to 0.07% of its issued shares. The filing also includes a monthly report for April 2026 on trading, pledges, and clearance of pledges by directors, executive officers, and 10% shareholders, with the provided tables showing no reported changes in shareholdings or pledged shares.
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.