EX-99.1

Exhibit 99.1

United Microelectronics Corporation

For the month of May, 2025

This is to report 1) the trading of directors, executive officers and 10% shareholders of United Microelectronics Corporation (“UMC”) (NYSE: UMC); 2) the pledge and clear of pledge of UMC common shares by directors, executive officers and 10% shareholders of UMC;

The trading of directors, executive officers and 10% shareholders

     Title

     Name

     Number of shares as of April 30, 2025

     Number of shares as of May 31, 2025

     Changes

     Executive Vice President
Senior Vice President
Vice President
Vice President
Vice President
Vice President
Vice President
Vice President
Vice President
Vice President

     Ming Hsu
Oliver Chang
TS Wu
C C Hsu
S F Tzou
Jerry CJ Hu
Steven S Liu
Francia Hsu
Mindy Lin
Eric Chen

     7,535,400
4,544,889
3,218,784
5,404,043
1,065,308
2,906,200
2,246,200
978,200
2,815,125
1,426,200

     7,195,400
4,435,889
2,598,784
5,204,043
925,308
2,479,200
1,546,200
868,200
2,769,125
976,200

     (340,000)
(109,000)
(620,000)
(200,000)
(140,000)
(427,000)
(700,000)
(110,000)
(46,000)
(450,000)

    

The pledge and clear of pledge of UMC common shares by directors, executive officers and 10% shareholders:


Title	Name	Number of shares as of April 30, 2025	Number of shares as of May 31, 2025	Changes
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