Every Form 4 that United Microelectronic Corp. (UMC) has filed with the SEC in the last 12 months is listed below, newest first, and each one links through to the document itself with the summary and the scores our analysis gives it.
A Form 4 covers the transactions officers, directors and large holders report, so if you follow UMC and want that one kind of document rather than the whole filing history, this is the page to keep. The company's other filings, of every form, are on the full UMC filings page.
UNITED MICROELECTRONICS CORP (UMC) reported that its chief financial officer and senior vice president, Liu Chitung, sold a total of 1,600,000 Common Shares in mid-September 2026. The sales consisted of 1,200,000 shares on September 16, 2026 at NT$142.333 per share and 400,000 shares on September 17, 2026 at NT$145 per share in open-market or private transactions.
After these transactions, Liu continues to have indirect exposure to UMC through 150,000 Common Shares held by a spouse and 1,000,000 Common Shares held in a CTBC Bank trust. The filing also notes that Liu has 1,126,840 Restricted Stock Awards, with specified portions scheduled to vest annually on December 5 from 2026 to 2029. No Rule 10b5-1 trading plan is reported for these sales.
For UNITED MICROELECTRONICS CORP (UMC), reporting person Liu Chitung, the company’s CFO & SVP, reported ownership changes in Common Shares tied to a trust restructuring on September 7, 2026. A CTBC Bank Trust distributed 1,000,000 shares to Liu, shifting those shares from indirect to direct ownership, bringing his direct holdings to 4,322,917 shares, which include 1,210,000 Restricted Stock Awards. The filing also shows 1,000,000 shares held indirectly through CTBC Bank Trust and 150,000 shares held indirectly by his spouse, and no transactions made under a Rule 10b5-1 trading plan.
UNITED MICROELECTRONICS CORP CFO & SVP Liu Chitung reported an open-market sale of 1,900,000 Common Shares on July 13, 2026 at NT$154.8900 per share. Following the sale, Liu holds 3,322,917 Common Shares directly, including 1,210,000 shares of Restricted Stock Award (RSA), with a specified number of RSA shares vesting annually on December 5 from 2026 to 2029. Liu also reports indirect ownership of 2,000,000 shares through CTBC Bank Trust, where the shares are under Trust with Discretion Reserved, and 150,000 shares held by a spouse.
UNITED MICROELECTRONICS CORP Vice President Hu Che-Jen reported an open-market sale of 10,000 common shares at 171.3 New Taiwan Dollars per share. After this transaction, he directly holds 3,214,080 common shares. This remaining position includes 828,800 shares of Restricted Stock Awards, with specified amounts scheduled to vest annually on December 5 from 2026 through 2029.