United Microelectronics UMC
$13.85 +$0.47 (+3.51%)
Market closed · Nov 6, 8:10 pm ET · Last extended-hours $13.98 +0.94%
Open$14.39
Prev close$13.38
Day range$13.65 – $14.54
Volume16.78M
Market cap$34.87B
P/E (TTM)13.7
Dividend yield2.94%
Ownership & positioning
Who holds it, who is betting against it, and where the big money is moving
Institutional ownership57.6%+0.15 pts vs. prior quarter
Institutions holding538-1 vs. prior quarter
Insider trades (recent)0 buys / 0 sellsBalanced
Short interest1.20% of floatDays to cover 2.5 · as of 15 Oct 2026
Short-sale volume share21.4%5-day average of daily volume
Short-sale volume as % of daily volume
Large-order net flow, last 20 sessions
Net of large-order buying minus selling, in USD. Over this window: −$17.89M (7 inflow days, 13 outflow days).
Net flow by order size, last 20 sessions
Super/Big orders approximate institutional-size trades; Mid/Small approximate retail-size trades. Net buy minus sell value in each bucket, summed over the window.
The five largest holders on file together own 24.8% of shares outstanding.
Largest holders
By investor type
Reported short interest has fallen from 1.36% to 1.20% of float over the last 6 biweekly reports (31 Jul 2026 to 15 Oct 2026).
Recent institutional activity
| Holder | Type | Period | Share change | New stake |
|---|---|---|---|---|
| Franklin Resources | Mutual Fund | 2026/Q3 | +1,988,565 | 0.3% |
| Vanguard Capital Management, LLC | Mutual Fund | 2026/Q3 | +1,964,955 | 4.1% |
| American Century Investment Management | Mutual Fund | 2026/Q3 | +1,526,400 | 0.4% |
| American Century Investment Management | Mutual Fund | 2026/Q3 | +1,506,600 | 0.4% |
| Vanguard Capital Management, LLC | Mutual Fund | 2026/Q3 | +1,113,313 | 4.1% |
| Uni-President Assets Management Corp. | Mutual Fund | 2026/Q3 | +44,155,437 | 1.9% |
| Fubon Asset Management Co., Ltd. | Mutual Fund | 2026/Q3 | +15,810,242 | 0.8% |
| Norges Bank Investment Management | Sovereign Wealth Fund | 2026/Q3 | +8,363,390 | 1.0% |
| Bank of America Corporation | Public Company | 2026/Q3 | +7,580,555 | 0.4% |
| The Goldman Sachs Group, Inc. | Public Company | 2026/Q3 | +4,906,933 | 0.4% |
| Neuberger Berman Investment Advisers LLC | Mutual Fund | 2026/Q3 | +4,134,788 | 0.2% |
| BlackRock | Mutual Fund | 2026/Q3 | +4,048,574 | 7.8% |
| JPMorgan Chase & Co. | Public Company | 2026/Q3 | +3,308,988 | 0.1% |
| Pacific Investment Management Company LLC | Mutual Fund | 2026/Q3 | +2,851,800 | 0.2% |
| Rafferty Asset Management, LLC | Mutual Fund | 2026/Q3 | +2,669,725 | 0.3% |
Institutional buy/sell activity by reporting period, largest moves first.
Insider transactions
| Date | Insider | Title | Transaction | Shares | Price | Held after |
|---|---|---|---|---|---|---|
| 30 Apr 2026 | Chia-Ao Lu | Vice President | Initial Statement of Beneficial | +0 | – | 170,000 |
| 30 Apr 2026 | Wen Tan | Initial Statement of Beneficial | +0 | – | 650,600 | |
| 28 Apr 2026 | Jin Shuang Chen | Deputy General Manager | Initial Statement of Beneficial | +0 | – | 2,343,080 |
| 28 Apr 2026 | Min Yu Lin | Initial Statement of Beneficial | +0 | – | 4,324,413 | |
| 28 Apr 2026 | Ying-Sheng Shen | Former Vice President | Initial Statement of Beneficial | +0 | – | 1,313,080 |
| 28 Apr 2026 | Steven S. Liu | Former Vice President | Initial Statement of Beneficial | +0 | – | 2,183,080 |
| 28 Apr 2026 | Kuei-Chun Hung | Deputy General Manager | Initial Statement of Beneficial | +0 | – | 5,879,566 |
| 28 Apr 2026 | Francia Hsu | Former Vice President | Initial Statement of Beneficial | +0 | – | 1,567,080 |
| 28 Apr 2026 | Oliver Chang | Senior Vice President of global sales | Initial Statement of Beneficial | +0 | – | 4,819,289 |
| 28 Apr 2026 | S.F. Tzou | Former Vice President | Initial Statement of Beneficial | +0 | – | 1,462,188 |
| 28 Apr 2026 | C.J. Hu | Former Vice President | Initial Statement of Beneficial | +0 | – | 3,224,080 |
| 28 Apr 2026 | Linwu Kuo | Vice President | Initial Statement of Beneficial | +0 | – | 913,080 |
| 28 Apr 2026 | Olivia Liao | Vice President & General Counsel | Initial Statement of Beneficial | +0 | – | 732,480 |
| 28 Apr 2026 | J.T. Lin | Vice President | Initial Statement of Beneficial | +0 | – | 1,229,660 |
| 28 Apr 2026 | Tzyy-Ming Cheng | Initial Statement of Beneficial | +0 | – | 2,868,080 | |
| 28 Apr 2026 | Yu-Chih Chuang | Vice President | Initial Statement of Beneficial | +0 | – | 1,213,274 |
| 28 Apr 2026 | Chung-Hsien Wu | CISO & SVP | Initial Statement of Beneficial | +0 | – | 3,685,888 |
| 17 Mar 2026 | Chi-Tung Liu | CFO, Senior VP, Head of Corporate Governance & Company Secretary | Initial Statement of Beneficial | +0 | – | 7,372,917 |
| 17 Mar 2026 | Jason S. Wang | CEO & Representative Director | Initial Statement of Beneficial | +0 | – | 32,655,440 |
| 17 Mar 2026 | Shu-Ling Wang | Independent Director | Initial Statement of Beneficial | +0 | – | 101,000 |
From Form 4/Form 144 filings. Negative share counts are disposals (sales, gifts, or shares withheld for taxes); positive are acquisitions.
Short interest, by report
| Report date | Shares short | % of float | Days to cover |
|---|---|---|---|
| 15 Oct 2026 | 30,184,605 | 1.2% | 2.5 |
| 30 Sep 2026 | 27,794,121 | 1.1% | 2.4 |
| 15 Sep 2026 | 38,400,261 | 1.5% | 3.6 |
| 31 Aug 2026 | 33,668,171 | 1.3% | 3.0 |
| 14 Aug 2026 | 29,695,086 | 1.2% | 2.6 |
| 31 Jul 2026 | 34,193,634 | 1.4% | 1.9 |
No comments yet — be the first to weigh in on UMC.