United Microelectronics
UMC · TAIWAN
$18.89+$0.36 (+1.94%)TodayMarket closed ·
Prev close $18.53
Who owns UMC
Largest institutional holders, from their latest 13F filings
The 10 largest institutions hold 24.2% of UMC’s shares.
- Yuanta Securities Investment Trust Co., Ltd.4.3%
- Hsun Chieh Investment Co., Ltd.3.5%
- Vanguard Capital Management, LLC2.7%
- BlackRock Institutional Trust Company, N.A.2.6%
- Next 6 largest institutions11.1%
- All other shareholders75.8%
| Holder | Shares | % of shares |
|---|---|---|
| Yuanta Securities Investment Trust Co., Ltd. | 538.51M | 4.28% |
| Hsun Chieh Investment Co., Ltd. | 441.37M | 3.51% |
| Vanguard Capital Management, LLC | 345.16M | 2.75% |
| BlackRock Institutional Trust Company, N.A. | 326.64M | 2.60% |
| Silicon Integrated Systems Corp. | 266.58M | 2.12% |
| Cathay Securities Investment Trust Co., Ltd. | 263.26M | 2.09% |
| Uni-President Assets Management Corp. | 241.00M | 1.92% |
| Taiwan Life Insurance Co Ltd | 218.19M | 1.74% |
| Aviva Investors Global Services Limited | 208.83M | 1.66% |
| Yan Yuan Investments Company Ltd. | 192.96M | 1.54% |
Largest mutual fund holders
| Holder | Shares | % of shares |
|---|---|---|
| Yuanta/P-shares Taiwan Top 50 ETF | 251.57M | 2.00% |
| Cathay MSCI Taiwan ESG Sustainability High Dividend Yield ETF | 188.70M | 1.50% |
| Vanguard Total International Stock Index Fund | 167.12M | 1.33% |
| Yuanta/P-shares Taiwan Dividend Plus ETF | 160.30M | 1.28% |
| Vanguard Emerging Markets Stock Index Fund (US) | 135.61M | 1.08% |
Insider trades
Form 4 filings by officers, directors and large holders
Over the last 6 months, insiders sold $524.72M (4 trades) of UMC on the open market, with no buys.
| Insider | Type | Shares | Value |
|---|---|---|---|
| LIN JEN-TSUNG | Sale | 10.00K | $1.63M |
| Liu Chitung | Sale | 400.00K | $58.00M |
| Liu Chitung | Sale | 1.20M | $170.80M |
| Liu Chitung | Other | 1.00M | — |
| Liu Chitung | Other | 1.00M | — |
| Liu Chitung | Sale | 1.90M | $294.29M |
Short interest
Settled Sep 30, 2026
- Shares short
- 27.79M
- Days to cover
- 2.39
- % of shares outstanding
- 0.22%
- Average daily volume
- 11.62M
- Change since last report
- −27.6%
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