Financial reports
20-F
2023 FY
Annual report (foreign)
25 Apr 24
20-F
2022 FY
Annual report (foreign)
27 Apr 23
20-F
2021 FY
Annual report (foreign)
28 Apr 22
20-F
2020 FY
Annual report (foreign)
29 Apr 21
20-F
2019 FY
Annual report (foreign)
28 Apr 20
20-F
2018 FY
Annual report (foreign)
25 Apr 19
20-F
2017 FY
Annual report (foreign)
26 Apr 18
20-F
2016 FY
Annual report (foreign)
13 Apr 17
20-F
2015 FY
Annual report (foreign)
18 Apr 16
20-F
2014 FY
Annual report (foreign)
21 Apr 15
Current reports
6-K
To announce related materials on acquisition of Software
25 Apr 24
6-K
Current report (foreign)
24 Apr 24
6-K
Current report (foreign)
16 Apr 24
6-K
Current report (foreign)
3 Apr 24
6-K
Current report (foreign)
25 Mar 24
6-K
Current report (foreign)
25 Mar 24
6-K
Current report (foreign)
22 Mar 24
6-K
Current report (foreign)
27 Feb 24
6-K
Current report (foreign)
26 Feb 24
6-K
UMC announced its operating results for the fourth quarter of 2023
31 Jan 24
Registration and prospectus
S-8
Registration of securities for employees
28 Dec 22
F-6 POS
Automatic registration for ADRs (post-effective amendment, foreign)
1 Aug 22
F-6 POS
Automatic registration for ADRs (post-effective amendment, foreign)
12 Apr 17
F-6EF
Automatic registration for ADRs (foreign)
22 Mar 11
F-6
Registration for ADRs (foreign)
13 Oct 09
S-8
Registration of securities for employees
10 May 07
F-6 POS
Automatic registration for ADRs (post-effective amendment, foreign)
19 Mar 07
F-6 POS
Automatic registration for ADRs (post-effective amendment, foreign)
2 Mar 06
S-8
Registration of securities for employees
26 Jul 05
S-8
Registration of securities for employees
21 Jan 03
Proxies
No filings
Other
SD
Conflict minerals disclosure
31 May 23
SD
Conflict minerals disclosure
27 May 22
SD
Conflict minerals disclosure
28 May 21
UPLOAD
Letter from SEC
17 Nov 20
CORRESP
Correspondence with SEC
6 Nov 20
UPLOAD
Letter from SEC
29 Oct 20
SD
Conflict minerals disclosure
29 May 20
SD
Conflict minerals disclosure
31 May 19
SD
Conflict minerals disclosure
31 May 18
SD
Conflict minerals disclosure
31 May 17
Ownership
SC 13G/A
BlackRock Inc.
5 Feb 24
SC 13G/A
BlackRock Inc.
10 Feb 23
SC 13G
BlackRock Inc.
8 Feb 22
SC 13G/A
MORGAN STANLEY
9 Jun 20
SC 13G/A
BlackRock Inc.
9 Jun 20
SC 13G
Beneficial ownership report
13 Feb 20
SC 13G/A
Beneficial ownership report (amended)
6 Feb 20
SC 13G/A
United Microelectronics Corp
13 Feb 19
SC 13G/A
Beneficial ownership report (amended)
7 Feb 19
SC 13G
United Microelectronics Corp
13 Feb 18