United Microelectronics (UMC) Short Interest Ratio & Short Volume $6.90 +0.07 (+1.02%) Closing price 03:59 PM EasternExtended Trading$6.88 -0.03 (-0.36%) As of 07:52 PM Eastern Extended trading is trading that happens on electronic markets outside of regular trading hours. This is a fair market value extended hours price provided by Polygon.io. Learn more. Add Compare Share Share Short Interest Stock AnalysisAnalyst ForecastsChartCompetitorsDividendEarningsFinancialsHeadlinesOptions ChainOwnershipSEC FilingsShort InterestTrendsBuy This Stock United Microelectronics Short Interest DataUnited Microelectronics (UMC) has a short interest of 52.49 million shares, representing 2.27% of the float (the number of shares available for trading by the public). This marks a 3.49% increase in short interest from the previous month. The short interest ratio (days to cover) is 7.2, indicating that it would take 7.2 days of the average trading volume of 4.45 million shares to cover all short positions.Current Short Interest52,490,000 sharesPrevious Short Interest50,720,000 sharesChange Vs. Previous Month+3.49%Dollar Volume Sold Short$345.91 millionShort Interest Ratio7.2 Days to CoverLast Record DateAugust 31, 2025Outstanding Shares2,512,140,000 sharesShort Percent of Float2.27%Today's Trading Volume4,451,572 sharesAverage Trading Volume4,448,006 sharesToday's Volume Vs. Average100% Short Selling United Microelectronics? Sign up to receive the latest short interest report for United Microelectronics and its competitors with MarketBeat's FREE newsletter. 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Skip Charts & View Short Interest HistoryShort Interest ChartDays to Cover ChartShort Percent of Float ChartUMC Short Interest Over TimeUMC Days to Cover Over TimeUMC Percentage of Float Shorted Over Time United Microelectronics Short Interest History Export to ExcelReport DateTotal Shares Sold ShortDollar Volume Sold ShortChange from Previous ReportPercentage of Float ShortedDays to CoverPrice on Report Date 8/31/202552,490,000 shares $345.91 million +3.5%2.3%7.2 $6.59 8/15/202550,720,000 shares $349.46 million -3.6%N/A6.3 $6.89 7/31/202552,590,000 shares $359.98 million -6.9%2.3%6.3 $6.85 7/15/202556,490,000 shares $421.98 million +2,132.8%N/A6.4 $7.47 6/30/20252,530,000 shares $19.33 million -96.4%3.5%4.1 $7.64 6/15/202569,860,000 shares $566.22 million -6.5%3.0%5.7 $8.11 5/31/202574,690,000 shares $569.14 million +2.9%3.2%5.8 $7.62 5/15/202572,570,000 shares $568.22 million +4.5%3.1%5.2 $7.83 4/30/202569,480,000 shares $489.83 million -10.3%N/A4.7 $7.05 4/15/202577,460,000 shares $536.41 million -2.5%3.4%5.1 $6.93 Get the Latest News and Ratings for UMC and Related StocksEnter your email address below to receive the latest news and analysts' ratings for United Microelectronics and its competitors with MarketBeat's FREE daily newsletter. 3/31/202579,450,000 shares $569.10 million -8.9%3.4%5.3 $7.16 3/15/202587,210,000 shares $590.85 million +4.7%3.8%6.6 $6.78 2/28/202583,300,000 shares $538.53 million +4.5%3.6%6.4 $6.47 2/15/202579,680,000 shares $499.20 million +3.2%3.5%6.7 $6.27 1/31/202577,240,000 shares $446.83 million +2.0%N/A6.6 $5.79 1/15/202575,750,000 shares $480.26 million -6.0%N/A6.2 $6.34 12/31/202480,550,000 shares $522.77 million -0.2%N/A7 $6.49 12/15/202480,700,000 shares $515.67 million +2.1%N/A6.9 $6.39 11/30/202479,060,000 shares $533.66 million +5.0%N/A6.7 $6.75 11/15/202475,320,000 shares $511.05 million +28.7%N/A6.1 $6.79 10/31/202458,540,000 shares $400.41 million +9.1%N/A4.7 $6.84 10/15/202453,650,000 shares $426.52 million +11.5%N/A4 $7.95 9/30/202448,110,000 shares $405.09 million +3.7%N/A3.4 $8.42 9/15/202446,380,000 shares $397.48 million +2.3%N/A3.4 $8.57 8/31/202445,320,000 shares $397.46 million -4.4%N/A3.5 $8.77 8/15/202447,420,000 shares $415.87 million +8.4%N/A3.9 $8.77 7/31/202443,750,000 shares $366.63 million -19.2%N/A4 $8.38 7/15/202454,110,000 shares $443.16 million -2.6%N/A5.8 $8.19 6/30/202455,560,000 shares $486.71 million -3.7%N/A6.7 $8.76 6/15/202457,690,000 shares $503.63 million -3.9%N/A7.2 $8.73 5/31/202460,050,000 shares $511.03 million +10.2%N/A7.5 $8.51 5/15/202454,510,000 shares $446.98 million -3.5%N/A6.9 $8.20 4/30/202456,490,000 shares $434.41 million -5.9%N/A7.2 $7.69 4/15/202460,050,000 shares $468.99 million -3.4%N/A7.5 $7.81 3/31/202462,190,000 shares $503.12 million +6.4%N/A8.3 $8.09 3/15/202458,470,000 shares $470.10 million +2.4%N/A7.8 $8.04 2/29/202457,100,000 shares $438.53 million -0.5%N/A7.8 $7.68 2/15/202457,410,000 shares $448.09 million -0.1%N/A8.4 $7.81 1/31/202457,440,000 shares $441.71 million -5.0%N/A8.5 $7.69 1/15/202460,450,000 shares $480.58 million +0.2%N/A9.1 $7.95 12/31/202360,360,000 shares $510.65 million -5.4%N/A9.5 $8.46 12/15/202363,820,000 shares $516.94 million +0.7%N/A10.2 $8.10 11/30/202363,380,000 shares $493.73 million -3.5%N/A10.4 $7.79 11/15/202365,690,000 shares $501.21 million +6.2%N/A10.6 $7.63 10/31/202361,860,000 shares $440.75 million +2.8%N/A10.2 $7.13 10/15/202360,150,000 shares $427.07 million +2.7%N/A10.3 $7.10 9/30/202358,600,000 shares $413.72 million +15.5%N/A10 $7.06 9/15/202350,760,000 shares $370.04 million +1.8%N/A8.6 $7.29 8/31/202349,850,000 shares $357.18 million +3.4%N/A8.4 $7.17 8/15/202348,230,000 shares $334.96 million +5.9%N/A7.6 $6.95 7/31/202345,560,000 shares $342.16 million +3.2%N/A7.1 $7.51 7/15/202344,160,000 shares $344.89 million -3.0%N/A6.7 $7.81 6/30/202345,510,000 shares $359.07 million -7.9%N/A7.2 $7.89 6/15/202349,400,000 shares $440.90 million -8.3%N/A7.7 $8.93 5/31/202353,880,000 shares $445.32 million +5.6%N/A8 $8.27 5/15/202351,020,000 shares $402.55 million +4.7%N/A8 $7.89 4/30/202348,710,000 shares $391.14 million -2.6%N/A7.3 $8.03 4/15/202350,020,000 shares $418.67 million -2.3%N/A7 $8.37 3/31/202351,220,000 shares $448.69 million -6.6%N/A6.9 $8.76 3/15/202354,810,000 shares $456.02 million +0.8%N/A7.2 $8.32 2/28/202354,390,000 shares $442.19 million +5.6%N/A7.2 $8.13 2/15/202351,530,000 shares $424.61 million -3.3%N/A6.6 $8.24 1/31/202353,280,000 shares $433.17 million +2.2%N/A6.1 $8.13 1/15/202352,160,000 shares $391.20 million +3.2%N/A5.7 $7.50 12/30/202250,560,000 shares $330.16 million +2.4%N/A5.1 $6.53 12/15/202249,390,000 shares $345.73 million -1.0%N/A4.9 $7.00 11/30/202249,880,000 shares $376.10 million -1.7%N/A5 $7.54 11/15/202250,730,000 shares $384.53 million -12.1%N/A5.1 $7.58 10/31/202257,720,000 shares $342.28 million +12.8%N/A6.2 $5.93 10/15/202251,190,000 shares $297.93 million -2.3%N/A5.9 $5.82 9/30/202252,410,000 shares $291.92 million +5.9%N/A6.4 $5.57 9/15/202249,510,000 shares $314.39 million -3.8%N/A5.9 $6.35 8/31/202251,460,000 shares $341.18 million +2.8%N/A6 $6.63 8/15/202250,040,000 shares $363.79 million -17.0%N/A5.8 $7.27 7/31/202260,290,000 shares $411.18 million +5.4%N/A6.8 $6.82 7/15/202257,220,000 shares $383.37 million +6.6%N/A6.3 $6.70 6/30/202253,670,000 shares $363.35 million +1.3%N/A6 $6.77 6/15/202252,990,000 shares $445.12 million -3.9%N/A5.9 $8.40 5/31/202255,120,000 shares $485.61 million -2.6%N/A6 $8.81 5/15/202256,570,000 shares $473.49 million -0.1%N/A5.8 $8.37 4/30/202256,600,000 shares $450.54 million -7.2%N/A5.6 $7.96 4/15/202261,010,000 shares $494.18 million +15.2%N/A5.6 $8.10 3/31/202252,950,000 shares $482.90 million +0.7%N/A4.9 $9.12 3/15/202252,560,000 shares $470.94 million +3.5%N/A5.4 $8.96 2/28/202250,770,000 shares $471.15 million -8.7%N/A5.4 $9.28 2/15/202255,580,000 shares $550.24 million +10.1%N/A6.1 $9.90 1/31/202250,500,000 shares $496.42 million +20.6%N/A5.9 $9.83 1/15/202241,880,000 shares $489.58 million +15.6%N/A5 $11.69 12/31/202136,230,000 shares $423.89 million +10.7%N/A4.8 $11.70 12/15/202132,720,000 shares $375.30 million -3.1%N/A4.2 $11.47 11/30/202133,780,000 shares $392.86 million -7.2%N/A4.6 $11.63 11/15/202136,380,000 shares $414.00 million +35.7%N/A4.8 $11.38 10/29/202126,820,000 shares $275.44 million +18.1%N/A3.4 $10.27 10/15/202122,720,000 shares $236.06 million +25.0%N/A3 $10.39 9/30/202118,170,000 shares $207.68 million -7.5%N/A2.4 $11.43 9/15/202119,640,000 shares $235.09 million +3.5%N/A2.8 $11.97 8/31/202118,970,000 shares $215.69 million +37.2%N/A2.7 $11.37 8/13/202113,830,000 shares $144.11 million +21.0%N/A2.1 $10.42 7/30/202111,430,000 shares $120.36 million -8.7%N/A1.7 $10.53 7/15/202112,520,000 shares $118.56 million -11.6%N/A2 $9.47 6/30/202114,170,000 shares $133.91 million +1.9%N/A2.3 $9.45 6/15/202113,910,000 shares $132.98 million -8.1%N/A2.2 $9.56 5/28/202115,140,000 shares $142.47 million +24.6%N/A2.5 $9.41 5/14/202112,150,000 shares $103.52 million +28.3%N/A1.8 $8.52 4/30/20219,470,000 shares $95.93 million -15.9%N/A1.4 $10.13 4/15/202111,260,000 shares $102.92 million -1.8%N/A1.6 $9.14 3/31/202111,460,000 shares $101.88 million -24.1%N/A1.5 $8.89 3/15/202115,100,000 shares $132.58 million -0.5%N/A2.1 $8.78 2/26/202115,170,000 shares $147.45 million -2.6%N/A2 $9.72 2/12/202115,580,000 shares $165.15 million -9.8%N/A2.2 $10.60 1/29/202117,270,000 shares $160.27 million +83.7%N/A2.7 $9.28 1/15/20219,400,000 shares $89.39 million +21.5%N/A1.5 $9.51 12/31/20207,740,000 shares $67.03 million +2.5%N/A1.6 $8.66 12/15/20207,550,000 shares $62.06 million +41.4%N/A1.7 $8.22 11/30/20205,340,000 shares $37.22 million +212.3%N/A1.3 $6.97 10/30/20201,420,000 shares $7.72 million +30.3%N/A0.5 $5.44 10/15/20201,090,000 shares $6.00 million +44.5%N/A0.4 $5.50 9/30/2020754,300 shares $3.61 million -3.5%N/A0.3 $4.79 UMC Short Interest - Frequently Asked Questions What is United Microelectronics' current short interest? Short interest is the volume of United Microelectronics shares that have been sold short but have not yet been closed out or covered. As of August 31st, investors have sold 52,490,000 shares of UMC short. 2.27% of United Microelectronics' shares are currently sold short. Learn More on United Microelectronics' current short interest. What is a good short interest ratio for United Microelectronics? The short interest ratio, also known as the "days to cover ratio", is calculated by dividing the number of shares of a stock sold short divided by its average trading volume. A short interest ratio ranging between 1 and 4 generally indicates strong positive sentiment about a stock and a lack of short sellers. A short interest ratio of 10 or greater indicates strong pessimism about a stock. UMC shares currently have a short interest ratio of 7.0. Learn More on United Microelectronics's short interest ratio. Which institutional investors are shorting United Microelectronics? As of the most recent reporting period, the following institutional investors, funds, and major shareholders have reported short positions of United Microelectronics: Sculptor Capital LP, Group One Trading LLC, Jane Street Group LLC, Walleye Capital LLC, Walleye Trading LLC, and Simplex Trading LLC. These positions are disclosed in Form 13F filings with the Securities and Exchange Commission. What is a good short interest percentage for United Microelectronics? Companies that have a short interest as a percentage of float below 10% indicates positive investor sentiment and few short sellers. Stocks with a short interest percentage above 10% is considered high, suggesting some investors are pessimistic about the stock. Companies with a short interest percentage of 20% or more indicates widespread negative sentiment. 2.27% of United Microelectronics' floating shares are currently sold short. Is United Microelectronics' short interest increasing or decreasing? United Microelectronics saw a increase in short interest in August. As of August 31st, there was short interest totaling 52,490,000 shares, an increase of 3.5% from the previous total of 50,720,000 shares. Changes in short volume can be used to identify positive and negative investor sentiment. Investors that short sell a stock are betting that its price will decline in the future. An increase in short sale volume suggests bearish (negative) sentiment among investors. A decrease on short sale volume suggests bullish (positive) sentiment. How does United Microelectronics' short interest compare to its competitors? 2.27% of United Microelectronics' shares are currently sold short. Here is how the short interest of companies in the industry of "electronic equipment" compare to United Microelectronics: NXP Semiconductors N.V. (2.84%), L3Harris Technologies Inc (1.37%), Vertiv Holdings Co. (2.81%), Astera Labs, Inc. (7.24%), Ubiquiti Inc. (13.70%), Celestica, Inc. (4.38%), Ericsson (0.85%), Credo Technology Group Holding Ltd. (5.08%), ASE Technology Holding Co., Ltd. (0.71%), Nokia Corporation (0.82%), Which stocks are the most shorted right now? As of the most recent reporting period, the following stocks had the largest short interest positions: SPDR S&P 500 ETF Trust ($73.23 billion), Invesco QQQ ($29.52 billion), iShares Russell 2000 ETF ($20.82 billion), iShares 20+ Year Treasury Bond ETF ($10.76 billion), Palo Alto Networks, Inc. ($9.37 billion), Strategy Inc ($7.58 billion), Invesco S&P 500 Equal Weight ETF ($6.78 billion), SPDR S&P Biotech ETF ($6.72 billion), AppLovin Corporation ($6.37 billion), and iShares iBoxx $ Investment Grade Corporate Bond ETF ($6.29 billion). View all of the most shorted stocks. What does it mean to sell short United Microelectronics stock? Short selling UMC is an investing strategy that aims to generate trading profit from United Microelectronics as its price is falling. UMC shares are trading up $0.08 today. To short a stock, an investor borrows shares, sells them and buys the shares back on the public market later to return it to the lender. Short sellers are betting that a stock will decline in price. If the stock does drop after selling, the short seller buys it back at a lower price and returns it to the lender. The difference between the sell price and the buy price is the trader's profit. How does a short squeeze work against United Microelectronics? A short squeeze for United Microelectronics occurs when it has a large amount of short interest and its stock appreciates in price. This forces short sellers to cover their short interest positions by buying actual shares of UMC, which in turn drives the price of the stock up even further. How often is United Microelectronics' short interest reported? Short interest is typically published by a stock exchange once per month. However, NASDAQ publishes a report for U.S. stocks, including UMC, twice per month. The most recent reporting period available is August, 31 2025. More Short Interest Resources from MarketBeat Related Companies NXP Semiconductors Short Squeeze L3Harris Technologies Short Squeeze Vertiv Short Squeeze Astera Labs Short Squeeze Ubiquiti Short Squeeze Celestica Short Squeeze Ericsson Short Squeeze Credo Technology Group Short Squeeze ASE Technology Short Squeeze Nokia Short Squeeze Short Interest Tools Stocks to Short Largest Short Interest Positions Short Interest Increases Short Interest Decreases Short Interest Reporting Dates This page (NYSE:UMC) was last updated on 9/17/2025 by MarketBeat.com Staff From Our PartnersHe Called Nvidia at $1.10. Now, He Says THIS Stock Will…The original Magnificent Seven returned 16,894%—turning $7K into $1.18 million. 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