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 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 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.
UNITED MICROELECTRONICS CORP Vice President Hu Che-Jen has reported an initial ownership position on a Form 3. The filing shows direct ownership of 3,224,080 Common Shares.
This total includes 828,800 shares of Restricted Stock Award (RSA), with a specified number of these RSA shares scheduled to vest each year on December 5 from 2026 through 2029. The Form 3 records holdings rather than any new purchase or sale.
UNITED MICROELECTRONICS CORP vice president HSU SHIH-CHIEH filed an initial Form 3 reporting existing holdings in the company’s common shares. The filing shows 2,075,080 common shares held directly and an additional 2,889 common shares held indirectly through a spouse.
The direct position includes 928,800 shares of Restricted Stock Award (RSA). A specified number of these RSA shares will vest each year on December 5 from 2026 through 2029, indicating a multi-year equity compensation schedule. The filing records holdings only and does not reflect new purchases or sales.
UNITED MICROELECTRONICS CORP executive Cheng Tzyyy-Ming, a Vice President, filed an initial ownership report showing direct holdings of 2,868,080 Common Shares.
The position includes 928,800 Restricted Stock Award (RSA) shares, with a specified number scheduled to vest each year on December 5 from 2026 through 2029.
UNITED MICROELECTRONICS CORP Vice President Tzou Shih-Fang filed an initial ownership report showing holdings of 1,462,188 Common Shares. This position includes 828,800 shares of Restricted Stock Award (RSA), with a specified number of RSA shares scheduled to vest each year on December 5 from 2026 through 2029.
UNITED MICROELECTRONICS CORP vice president Chen Ming‑Tsung has filed an initial Form 3 reporting his equity stake in the company. The filing shows direct beneficial ownership of 2,484,660 Common Shares after the reported entry.
This total includes 674,600 shares granted as a Restricted Stock Award (RSA). According to the footnote, a specified number of these RSA shares will vest each year on December 5 from 2026 through 2029, meaning portions of this award become fully owned over that period.
UNITED MICROELECTRONICS CORP vice president Yu-Chih Chuang filed an initial Form 3 reporting beneficial ownership of company shares. The filing shows direct ownership of 1,199,331 common shares and indirect ownership of 13,943 common shares held by a spouse.
A footnote explains that these holdings include 674,600 shares of Restricted Stock Awards. Specified portions of this restricted stock are scheduled to vest each year on December 5 from 2026 through 2029, illustrating a multi‑year equity compensation structure tied to continued service.
UNITED MICROELECTRONICS CORP vice president Lin Jen-Tsung filed an initial ownership report showing his equity stake in the company. The filing reports direct ownership of 1,229,660 common shares. This total includes 714,600 shares granted as a Restricted Stock Award.
A specified number of these Restricted Stock Award shares will vest each year on December 5 from 2026 through 2029, meaning portions of the award become fully owned over time as service-based conditions are met. The filing does not report any new purchases or sales, only the existing holdings and vesting schedule.
UNITED MICROELECTRONICS CORP senior vice president Oliver Chang filed an initial Form 3 showing direct ownership of 4,819,289 Common Shares. This holding includes 1,270,000 shares of Restricted Stock Award (RSA), with a specified portion scheduled to vest each year on December 5 from 2026 through 2029. The filing records Chang’s starting equity position as an officer rather than any new share purchase or sale.