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Exhibit

Exhibit Description

 

99.1 Announcement on 2026/01/14: UMC will convene Q4 2025 Investor Conference

99.2 Announcement on 2026/01/09: the trading and pledge of UMC common shares by directors, executive officers and 10% shareholders of UMC

 

 


 

UMC will convene Q4 2025 Investor Conference

1. Date of institutional investor conference: 2026/01/28

2. Time of institutional investor conference: 17:00

3. Location of institutional investor conference: Online teleconference

4. Outline of institutional investor conference: UMC Q4 2025 Financial and Operating Results

5. Any other matters that need to be specified: None

 

 


 

.2

United Microelectronics Corporation

For the month of December, 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;

1)
The trading of directors, executive officers and 10% shareholders

Title

Name

Number of shares as of November 30, 2025

Number of shares as of December 31, 2025

Changes

Chairman

President

President

Executive Vice President

Senior Vice President

Senior Vice President

Senior Vice President

Senior Vice President

Vice President

Vice President

Vice President

Vice President

Vice President

Vice President

Vice President

Vice President

Vice President

Vice President

Vice President

Vice President

Vice President

Vice President

Stan Hung

SC Chien

Jason Wang

Ming Hsu

TS Wu

G C Hung

Oliver Chang

Chitung Liu

JT Lin

Victor Chuang

Chuck Chen

S F Tzou

Osbert Cheng

Steven Hsu

Jerry CJ Hu

Y S Shen

Steven S Liu

Francia Hsu

Mindy Lin

Linwu Kuo

Eric Chen

Olivia Liao

59,486,252

19,479,448

28,899,800

6,515,400

2,488,784

2,682,766

3,465,889

4,569,517

523,100

487,771

1,773,100

575,308

2,031,200

1,108,200

2,397,200

406,200

1,296,200

768,200

2,698,125

46,200

1,476,200

--

59,726,492

19,719,688

29,140,040

6,625,520

2,558,084

2,752,066

3,558,289

4,661,917

560,060

524,731

1,810,060

633,388

1,939,280

1,146,280

2,405,280

464,280

1,354,280

756,280

2,714,205

104,280

1,534,280

31,680

240,240

240,240

240,240

110,120

69,300

69,300

92,400

92,400

36,960

36,960

36,960

58,080

(91,920)

38,080

8,080

58,080

58,080

(11,920)

16,080

58,080

58,080

31,680

2)
The pledge and clear of pledge of UMC common shares by directors, executive officers and 10% shareholders:

Title

Name

Number of shares as of November 30, 2025

Number of shares as of December 31, 2025

Changes

--

--

--

--

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