Estimated market cap $38.77BShares outstanding from the company’s latest SEC filing (all share classes, each priced at its own close; ADRs converted to ADS) × last close from Tiingo. Updated daily. This figure: shares as of Dec 31, 2025, last close Nov 13, 2026.2.52B ADSs, shares as of Dec 31, 2025CIK 1033767The SEC’s Central Index Key, the number it uses to identify every company and person that files.
Insider trades, 12 mo
0 buys · 5 sells
$526.43M sold, open market
Congress trades, 24 mo
—
No disclosed trades
13F holders
…
Lobbying, 12 mo
—
No lobbying filings
Federal contracts, 12 mo
—
None matched
Ask your AI:
Latest 10-Q
What changed in United Microelectronics Corporation's latest quarterly report, compared with the one before.
We have not read a recent 10-Q for this company yet.
Insider trades
Open-market trades from Form 4. 10b5-1 marks a plan set in advance.Open-market buys and sales by officers, directors and 10% owners, from SEC Form 4. A plan set in advance is marked 10b5-1.
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13F holders
Funds that report this stock, checked against market prices.Fund managers with over $100 million in US-listed stocks file a 13F each quarter, up to 45 days after quarter end. Long positions only.
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Top 10 holders.Premium lists every holder, with CSV downloads.
Disclosed in dollar ranges, up to 45 days after the trade.Members of Congress, their spouses and dependent children report trades in dollar ranges, up to 45 days after the trade.
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Lobbying
What United Microelectronics Corporation and its lobbying firms report each quarter.A company that lobbies with its own staff reports its expenses; a lobbying firm it hires reports the income it received. We count both.
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Institutional ownership over time
How many funds reported holding the stock at the end of each quarter, and how many shares they held between them.
13F holders, Q3 2026Fund managers with over $100 million in US-listed stocks file a 13F each quarter, up to 45 days after quarter end. Long positions only.
263
94 added · 96 trimmed
Insider trades
5 in 12 mo
Open-market trades from Form 4. 10b5-1 marks a plan set in advance.Open-market buys and sales by officers, directors and 10% owners, from SEC Form 4. A plan set in advance is marked 10b5-1.
No open-market insider trades reported since Sep 22, 2026. Insiders have two business days to file.
Recent insider trades
How the stock has done since the trade date, measured against the S&P 500 over the same days. It describes the stock, not the trader's actual gain or loss.
263 funds report UMC. Values checked against market prices.Fund managers with over $100 million in US-listed stocks file a 13F each quarter, up to 45 days after quarter end. Long positions only.
Q3 2026. 42 new, 94 added to, 96 trimmed, 143 exited since Q2 2026.
One of these funds reports its values in thousands of dollars; its figures are shown in dollars.
Download CSVEvery fund that holds UMC, not only these ten. A download holds at most 10,000 rows; narrow the filters to get a smaller slice.
Trades by members of Congress
Disclosed in dollar ranges, up to 45 days after the trade.Members of Congress, their spouses and dependent children report trades in dollar ranges, up to 45 days after the trade.
No recent congressional trades for this company.
Lobbying
What United Microelectronics Corporation and its lobbying firms report each quarter.A company that lobbies with its own staff reports its expenses; a lobbying firm it hires reports the income it received. We count both.
No recent lobbying filings for this company.
Institutional ownership over time
How many funds reported holding the stock at the end of each quarter, and how many shares they held between them.
Funds holding the stock
Shares they report
Funds holding the stock by quarter
Q2 2013
94
—
160.58M
$345.5M
Q3 2013
96
+2
174.61M
$340.3M
Q4 2013
91
-5
157.30M
$303.2M
Q1 2014
88
-3
147.49M
$307.2M
Q2 2014
94
+6
140.38M
$337.7M
Q3 2014
83
-11
128.91M
$257.0M
Q4 2014
92
+9
133.03M
$302.9M
Q1 2015
93
+1
131.78M
$320.8M
Q2 2015
98
+5
130.26M
$267.1M
Q3 2015
91
-7
128.10M
$209.0M
Q4 2015
85
-6
130.62M
$245.4M
Q1 2016
88
+3
128.61M
$267.5M
Q2 2016
77
-11
135.49M
$269.6M
Q3 2016
86
+9
137.63M
$254.7M
Q4 2016
84
-2
135.21M
$236.7M
Q1 2017
97
+13
143.92M
$277.9M
Q2 2017
110
+13
130.94M
$319.3M
Q3 2017
104
-6
141.67M
$354.2M
Q4 2017
112
+8
140.46M
$335.7M
Q1 2018
107
-5
135.29M
$350.4M
Q2 2018
114
+7
133.10M
$375.2M
Q3 2018
117
+3
124.34M
$321.1M
Q4 2018
119
+2
129.99M
$233.7M
Q1 2019
123
+4
129.10M
$242.9M
Q2 2019
119
-4
125.81M
$278.9M
Q3 2019
118
-1
124.33M
$261.4M
Q4 2019
120
+2
107.93M
$289.5M
Q1 2020
122
+2
124.02M
$271.2M
Q2 2020
122
0
118.25M
$312.4M
Q3 2020
145
+23
102.74M
$493.0M
Q4 2020
190
+45
90.35M
$762.4M
Q1 2021
205
+15
89.90M
$818.6M
Q2 2021
203
-2
89.55M
$847.1M
Q3 2021
230
+27
117.96M
$1.3B
Q4 2021
264
+34
116.53M
$1.4B
Q1 2022
240
-24
128.11M
$1.2B
Q2 2022
225
-15
126.51M
$870.1M
Q3 2022
226
+1
133.54M
$745.2M
Q4 2022
223
-3
133.18M
$873.8M
Q1 2023
221
-2
133.19M
$1.2B
Q2 2023
220
-1
126.81M
$1.0B
Q3 2023
217
-3
129.24M
$912.6M
Q4 2023
250
+33
129.77M
$1.1B
Q1 2024
241
-9
149.69M
$1.2B
Q2 2024
237
-4
132.97M
$1.2B
Q3 2024
268
+31
161.35M
$1.4B
Q4 2024
253
-15
160.45M
$1.0B
Q1 2025
236
-17
155.04M
$1.1B
Q2 2025
241
+5
151.23M
$1.2B
Q3 2025
241
0
133.16M
$1.0B
Q4 2025
272
+31
151.24M
$1.2B
Q1 2026
320
+48
174.44M
$1.6B
Q2 2026
364
+44
180.11M
$4.9B
Q3 2026
263
-101
119.31M
$2.9B
Each point is a quarter-end, from Q2 2013 to Q3 2026. A fund's 13F lists its long positions in US-listed securities as of the last day of the quarter and arrives up to 45 days later, so each point shows holdings at quarter-end, not on the day they were reported.
Common shares only; options and bonds are left out. When a fund amends a report, the amended version is the one counted.
The history follows the company's current CUSIP number (910873405). If the company's shares were ever re-issued under a different CUSIP, the quarters before the change are not part of this series, so the first point (Q2 2013) can be later than the stock's first appearance in 13F reports.
Share counts are adjusted for stock splits; none took place between these quarters. Values are in dollars as reported at the time and are not adjusted.
A quarter appears once our daily update has built its summary. If a summary cannot be built, older reports are kept and the chart shows the quarters it has until the next update repairs it.