United Microelectronics Corporation
United Microelectronics Corporation (UMC) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · UMC · as of Sep 30, 2025
Ownership Breakdown
251
Institutional Holders
▲ 4 vs Q2
$1.00B
Total Inst. Value
▼ $153.37M vs Q2
2.49B
Shares Outstanding
freeFloat 93.22%
132.34M
13F Shares Held
▼ 18.61M vs Q2
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
UMC largest shareholders · institutional ownership
Q3 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
BLACKROCK, INC. semiconductors & related devices | 24.14M | 96.68% | 96.68% | $182.99B | Nov 12, 2025 | ▼ 176.3K |
MORGAN STANLEY semiconductors & related devices | 21.85M | 87.51% | 87.51% | $165.63B | May 27, 2026 | ▲ 37.2K |
VANGUARD GROUP INC semiconductors & related devices | 14.25M | 57.08% | 57.08% | $108.03B | Nov 7, 2025 | ▼ 573.0K |
BANK OF AMERICA CORP /DE/ semiconductors & related devices | 7.39M | 29.59% | 29.59% | $56.01B | Feb 3, 2026 | ▲ 344.4K |
RAFFERTY ASSET MANAGEMENT, LLC semiconductors & related devices | 6.22M | 24.91% | 24.91% | $47.15B | Nov 12, 2025 | ▼ 2.18M |
STATE STREET CORP semiconductors & related devices | 4.53M | 18.14% | 18.14% | $34.34B | Nov 14, 2025 | ▲ 236.8K |
GOLDMAN SACHS GROUP INC semiconductors & related devices | 4.41M | 17.67% | 17.67% | $33.44B | Nov 14, 2025 | ▼ 1.17M |
SCHRODER INVESTMENT MANAGEMENT GROUP semiconductors & related devices | 4.15M | 16.63% | 16.63% | $31.52B | Nov 13, 2025 | ▼ 84.9K |
BARCLAYS PLC semiconductors & related devices | 4.08M | 16.32% | 16.32% | $30.90B | Mar 31, 2026 | ▼ 1.18M |
UBS GROUP AG semiconductors & related devices | 3.76M | 15.07% | 15.07% | $28.52B | Nov 13, 2025 | ▼ 13.13M |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q3 2025 vs prior quarter
Q3 2025
29
Increased
+11.50M shares1
New Positions
first time holders18
Decreased
−22.81M shares0
Sold Out
fully exitedNet shares change (top 50)
11.31M
+11.50M / −22.81M
Net new holders
+12
1 new / 0 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
UMC insider trading · insider activity
Source: SEC Form 4
0
Buy transactions
0
Sell transactions
0.00
Buy/Sell ratio
$0M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
No recent insider transactions reported.
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
United Microelectronics Corporation (UMC) is primarily owned by institutional investors, who hold approximately 5.3% of total shares outstanding. Company insiders own approximately 6.78%, while retail and public investors account for the remaining 87.92%.
The largest institutional shareholder of United Microelectronics Corporation is BLACKROCK, INC., holding approximately 24.14 million shares — equal to 96.68% of outstanding shares — as of September 30, 2025.
A total of 251 institutional investors currently hold UMC stock, with a combined institutional value of approximately $1.00 billion as of the most recent 13F filing period.
Frequently asked questions
UMC ownershipUnited Microelectronics Corporation (UMC) is primarily owned by institutional investors, who hold approximately 5.3% of shares. The largest shareholder is BLACKROCK, INC. with a 96.68% stake. Company insiders hold 6.78%. Data sourced from SEC Form 13F as of September 30, 2025.