Key Highlights

  • United Microelectronics furnished an announcement dated September 10, 2026 on trading and pledging of UMC shares for August 2026.
  • The report covers directors, executive officers and 10% shareholders, with separate sections for share trading and for pledges.
  • Each table compares holdings at July 31 and August 31, 2026 and shows changes; each holds one row of dashes.
  • The cover report was signed by Chief Financial Officer Chitung Liu and filed on September 29, 2026.

United Microelectronics Corporation (NYSE:UMC) filed a Form 6-K on September 29, 2026 attaching an announcement, dated September 10, 2026, on the trading and pledging of UMC common shares by its directors, executive officers and 10% shareholders for August 2026.

The exhibit is titled "Announcement on 2026/09/10: the trading and pledge of UMC common shares by directors, executive officers and 10% shareholders." It has two sections. The first covers the trading of shares by directors, executive officers and 10% shareholders of United Microelectronics Corporation. The second covers the pledge and clearing of pledges of UMC common shares by the same groups.

What the Exhibit Contains

Each section uses the same five-column table: title, name, number of shares as of July 31, 2026, number of shares as of August 31, 2026, and changes. Those column headings show that the report is built to compare a person's holding at the end of July with the holding at the end of August, and to show the difference. In this filing, each table has a single row filled with dashes.

The Cover Report

The cover document is the standard report of a foreign private issuer under Rules 13a-16 or 15d-16 of the Securities Exchange Act of 1934. It gives the company's address as No. 3 Li-Hsin 2nd Road, Hsinchu Science Park, Hsinchu, Taiwan, and marks Form 20-F as the form on which the company files its annual reports. It lists a single exhibit, Exhibit 99.1, and is signed by Chitung Liu, whose title is given as Chief Financial Officer. The filing date is September 29, 2026, which is nearly three weeks after the September 10 date on the announcement itself.

Why the Report Exists

What it does show is that the company publishes a recurring monthly statement about insider holdings and pledges, and that it furnishes that statement to U.S. investors through a Form 6-K. Reports of this kind cover two separate subjects: trades in the company's shares by directors, executive officers and 10% shareholders, and any pledges of those shares as security, which are listed separately from trades.

It is a narrow disclosure about the holdings of specific groups for a single calendar month.

What to Look for in UMC's Next Monthly Holdings Report

The next report in this series would cover the following month and would be expected to follow a similar format, although this filing does not state a schedule.