MKS Instruments (MKSI) Short Interest Ratio & Short Volume $90.21 -1.24 (-1.36%) Closing price 04:00 PM EasternExtended Trading$89.87 -0.34 (-0.38%) As of 07:47 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 ForecastsChartCompetitorsDividendEarningsFinancialsHeadlinesInsider TradesOptions ChainOwnershipSEC FilingsShort InterestSustainabilityTrendsBuy This Stock MKS Instruments Short Interest DataMKS Instruments (MKSI) has a short interest of 3.17 million shares, representing 4.73% of the float (the number of shares available for trading by the public). This marks a -2.76% decrease in short interest from the previous month. The short interest ratio (days to cover) is 3.4, indicating that it would take 3.4 days of the average trading volume of 891,648 shares to cover all short positions.Current Short Interest3,170,000 sharesPrevious Short Interest3,260,000 sharesChange Vs. Previous Month-2.76%Dollar Volume Sold Short$291.07 millionShort Interest Ratio3.4 Days to CoverLast Record DateFebruary 28, 2025Outstanding Shares67,378,000 sharesShort Percent of Float4.73%Today's Trading Volume524,523 sharesAverage Trading Volume891,648 sharesToday's Volume Vs. Average59% Short Selling MKS Instruments? Sign up to receive the latest short interest report for MKS Instruments and its competitors with MarketBeat's FREE newsletter. Email Address Skip Charts & View Short Interest HistoryShort Interest ChartDays to Cover ChartShort Percent of Float ChartMKSI Short Interest Over TimeMKSI Days to Cover Over TimeMKSI Percentage of Float Shorted Over Time Remove Ads MKS Instruments Short Interest History Export to ExcelReport DateTotal Shares Sold ShortDollar Volume Sold ShortChange from Previous ReportPercentage of Float ShortedDays to CoverPrice on Report Date 2/28/20253,170,000 shares $291.07 million -2.8%4.7%3.4 $91.82 2/15/20253,260,000 shares $337.96 million +9.0%4.9%3.9 $103.67 1/31/20252,990,000 shares $338.71 million -8.0%N/A3.7 $113.28 1/15/20253,250,000 shares $370.66 million -0.3%N/A4 $114.05 12/31/20243,260,000 shares $340.31 million +13.6%N/A4.1 $104.39 12/15/20242,870,000 shares $323.02 million +38.7%N/A3.5 $112.55 11/30/20242,070,000 shares $235.23 million +2.0%N/A2.4 $113.64 11/15/20242,030,000 shares $214.12 million +9.1%N/A2.4 $105.48 10/31/20241,860,000 shares $184.75 million +7.5%N/A2.2 $99.33 10/15/20241,730,000 shares $179.87 million -6.5%N/A1.9 $103.97 Get the Latest News and Ratings for MKSI and Related StocksEnter your email address below to receive the latest news and analysts' ratings for MKS Instruments and its competitors with MarketBeat's FREE daily newsletter. 9/30/20241,850,000 shares $201.11 million -24.2%N/A2 $108.71 9/15/20242,440,000 shares $272.91 million -17.9%N/A2.6 $111.85 8/31/20242,970,000 shares $354.11 million +14.7%N/A3.1 $119.23 8/15/20242,590,000 shares $311.40 million -1.2%N/A2.7 $120.23 7/31/20242,620,000 shares $329.86 million -14.7%N/A2.4 $125.90 7/15/20243,070,000 shares $437.97 million -5.5%N/A3.3 $142.66 6/30/20243,250,000 shares $424.39 million -1.8%N/A3.7 $130.58 6/15/20243,310,000 shares $442.78 million -2.7%N/A3.9 $133.77 5/31/20243,400,000 shares $430.41 million +28.8%N/A4.4 $126.59 5/15/20242,640,000 shares $339.90 million +15.8%N/A3.6 $128.75 4/30/20242,280,000 shares $271.27 million +0.9%N/A3.6 $118.98 4/15/20242,260,000 shares $272.33 million -2.6%N/A3.6 $120.50 3/31/20242,320,000 shares $308.56 million +2.7%N/A3.7 $133.00 3/15/20242,260,000 shares $273.93 million +4.2%N/A3.5 $121.21 2/29/20242,170,000 shares $266.39 million +3.3%N/A3 $122.76 2/15/20242,100,000 shares $260.09 million -7.5%N/A2.9 $123.85 1/31/20242,270,000 shares $241.64 million -3.0%N/A3.2 $106.45 1/15/20242,340,000 shares $237.07 million +12.0%N/A3 $101.31 12/31/20232,090,000 shares $215.00 million -16.4%N/A2.7 $102.87 12/15/20232,500,000 shares $240.33 million +6.8%N/A3.3 $96.13 11/30/20232,340,000 shares $193.17 million +0.4%N/A3.5 $82.55 11/15/20232,330,000 shares $178.69 million +8.9%N/A3.7 $76.69 10/31/20232,140,000 shares $140.51 million -10.1%N/A3.4 $65.66 10/15/20232,380,000 shares $188.97 million +0.9%N/A4.1 $79.40 9/30/20232,360,000 shares $204.23 million -8.5%N/A4.2 $86.54 9/15/20232,580,000 shares $228.43 million +37.2%N/A4.4 $88.54 8/31/20231,880,000 shares $188.43 million +19.8%N/A3.3 $100.23 8/15/20231,570,000 shares $147.85 million +6.8%N/A2.4 $94.17 7/31/20231,470,000 shares $160.48 million -23.4%N/A2.1 $109.17 7/15/20231,920,000 shares $206.27 million -20.7%N/A2.9 $107.4330-year market phenomenon opens up overnight opportunity (Ad)Imagine this: When things worked out, you woke up, checked your account, and saw that you’ve made money overnight. Sounds like a dream, right? Well, what if that wasn’t a dream anymore? Earning while you sleep isn’t easy, and it definitely doesn’t happen overnight for most people. Tap here for the full breakdown. 6/30/20232,420,000 shares $261.60 million +9.0%N/A3.9 $108.10 6/15/20232,220,000 shares $233.23 million -8.6%N/A3.6 $105.06 5/31/20232,430,000 shares $236.46 million +8.5%N/A3.8 $97.31 5/15/20232,240,000 shares $191.65 million +15.5%N/A3.7 $85.56 4/30/20231,940,000 shares $162.71 million +8.4%N/A3.2 $83.87 4/15/20231,790,000 shares $147.75 million +2.3%N/A3 $82.54 3/31/20231,750,000 shares $155.09 million -15.5%N/A2.7 $88.62 3/15/20232,070,000 shares $180.19 million -27.1%N/A3 $87.05 2/28/20232,840,000 shares $275.28 million +13.2%N/A3.9 $96.93 2/15/20232,510,000 shares $251.73 million -5.6%N/A3.4 $100.29 1/31/20232,660,000 shares $272.17 million +6.4%N/A3.5 $102.32 1/15/20232,500,000 shares $251.80 million -19.6%N/A3.1 $100.72 12/30/20223,110,000 shares $263.51 million +36.4%N/A3.8 $84.73 12/15/20222,280,000 shares $185.71 million +6.1%N/A2.8 $81.45 11/30/20222,150,000 shares $180.30 million +20.1%N/A2.8 $83.86 11/15/20221,790,000 shares $144.99 million +14.0%N/A2.4 $81.00 10/31/20221,570,000 shares $128.98 million -6.0%N/A2.2 $82.15 10/15/20221,670,000 shares $124.67 million +16.8%N/A2.6 $74.65 9/30/20221,430,000 shares $118.18 million +22.2%N/A2.4 $82.64 9/15/20221,170,000 shares $106.40 million +27.3%N/A2 $90.94 8/31/2022919,200 shares $91.56 million -38.7%N/A1.6 $99.61 8/15/20221,500,000 shares $178.28 million -10.2%N/A2.6 $118.85 7/31/20221,670,000 shares $197.39 million +0.6%3.0%3.1 $118.20 7/15/20221,660,000 shares $170.57 million -2.9%3.0%3 $102.75 6/30/20221,710,000 shares $175.50 million -3.9%3.1%2.8 $102.63 6/15/20221,780,000 shares $192.79 million -6.3%3.2%2.8 $108.31 5/31/20221,900,000 shares $234.65 million +0.5%3.4%3.1 $123.50 5/15/20221,890,000 shares $223.28 million +8.6%3.4%3 $118.14 4/30/20221,740,000 shares $198.33 million -7.5%3.2%2.8 $113.98 4/15/20221,880,000 shares $215.30 million -6.0%3.4%3 $114.52 3/31/20222,000,000 shares $300 million -7.0%3.6%3.4 $150.00 3/15/20222,150,000 shares $309.86 million +9.1%3.9%4.2 $144.12 2/28/20221,970,000 shares $296.68 million +8.8%3.6%4 $150.60 2/15/20221,810,000 shares $276.12 million +11.7%3.3%3.7 $152.55 1/31/20221,620,000 shares $251.63 million -12.9%2.9%3.5 $155.33 1/15/20221,860,000 shares $336.08 million +12.7%3.4%4.3 $180.69 12/31/20211,650,000 shares $287.38 million +4.4%3.0%3.9 $174.17 12/15/20211,580,000 shares $258.49 million No Change2.9%3.6 $163.60 11/30/20211,580,000 shares $240.41 million +3.3%2.9%3.7 $152.16 11/15/20211,530,000 shares $253.77 million +20.5%2.8%3.7 $165.86 10/29/20211,270,000 shares $190.56 million +5.0%2.3%3.1 $150.05 10/15/20211,210,000 shares $175.05 million -0.8%2.2%2.9 $144.67 9/30/20211,220,000 shares $184.11 million -12.2%2.2%2.7 $150.91 9/15/20211,390,000 shares $210.22 million -15.2%2.5%3.1 $151.24 8/31/20211,640,000 shares $241.38 million +1.9%3.0%3.7 $147.18 8/13/20211,610,000 shares $235.32 million +43.8%2.9%3.8 $146.16 7/30/20211,120,000 shares $175.21 million +8.7%2.0%2.7 $156.44 7/15/20211,030,000 shares $166.67 million +44.2%1.9%2.8 $161.82 6/30/2021714,200 shares $127.09 million -3.2%1.3%2.1 $177.95 6/15/2021738,000 shares $131.38 million -11.2%1.3%2.2 $178.0230-year market phenomenon opens up overnight opportunity (Ad)Imagine this: When things worked out, you woke up, checked your account, and saw that you’ve made money overnight. Sounds like a dream, right? Well, what if that wasn’t a dream anymore? Earning while you sleep isn’t easy, and it definitely doesn’t happen overnight for most people. Tap here for the full breakdown. 5/28/2021831,400 shares $156.49 million +51.0%1.5%2.5 $188.23 5/14/2021550,600 shares $94.28 million +16.7%N/A1.4 $171.24 4/30/2021471,900 shares $87.44 million -17.6%N/A1 $185.30 4/15/2021573,000 shares $106.43 million -21.5%N/A1.2 $185.74 3/31/2021730,000 shares $132.60 million -19.4%N/A1.5 $181.64 3/15/2021905,500 shares $150.46 million +1.8%N/A1.9 $166.16 2/26/2021889,400 shares $144.13 million +22.0%N/A1.9 $162.05 2/12/2021729,200 shares $118.75 million +34.5%N/A1.7 $162.85 1/29/2021542,300 shares $90.55 million -19.3%N/A1.5 $166.97 1/15/2021672,300 shares $119.53 million +7.1%N/A2.1 $177.79 12/31/2020627,500 shares $95.86 million +14.4%N/A2.1 $152.76 12/15/2020548,600 shares $82.51 million +0.4%N/A1.8 $150.41 11/30/2020546,500 shares $75.49 million -21.4%N/A1.7 $138.13 11/15/2020695,500 shares $88.38 million -23.0%N/A2.2 $127.07 10/30/2020903,700 shares $101.97 million +6.8%N/A2.8 $112.84 10/15/2020846,400 shares $98.91 million +6.4%N/A2.5 $116.86 9/30/2020795,600 shares $86.90 million -12.1%N/A2.2 $109.23 9/15/2020904,600 shares $96.11 million -4.3%N/A2.4 $106.25 8/31/2020945,400 shares $113.00 million +15.7%N/A2.4 $119.53 8/14/2020817,500 shares $101.70 million -3.9%N/A2.1 $124.40 7/31/2020850,900 shares $108.44 million -31.4%N/A2.2 $127.44 7/15/20201,240,000 shares $140.81 million -8.8%2.3%3.1 $113.56 6/30/20201,360,000 shares $149.98 million -4.2%N/A3.4 $110.28 6/15/20201,420,000 shares $150.22 million -13.9%2.6%3.7 $105.79 5/29/20201,650,000 shares $174.29 million -4.1%3.0%4 $105.63 5/15/20201,720,000 shares $159.05 million +8.2%3.2%4 $92.47 4/30/20201,590,000 shares $159.37 million -11.2%2.9%3.6 $100.23 4/15/20201,790,000 shares $152.87 million -5.8%3.3%3.7 $85.40 3/31/20201,900,000 shares $175.48 million +5.4%3.5%3.9 $92.36 MKSI Short Interest - Frequently Asked Questions What is MKS Instruments' current short interest? Short interest is the volume of MKS Instruments shares that have been sold short but have not yet been covered or closed out. As of February 28th, investors have sold 3,170,000 shares of MKSI short. 4.73% of MKS Instruments' shares are currently sold short. Learn More on MKS Instruments' current short interest. What is a good short interest ratio for MKS Instruments? 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. MKSI shares currently have a short interest ratio of 3.0. Learn More on MKS Instruments's short interest ratio. Which institutional investors are shorting MKS Instruments? As of the most recent reporting period, the following institutional investors, funds, and major shareholders have reported short positions of MKS Instruments: Wolverine Trading LLC, Citadel Advisors LLC, Jane Street Group LLC, Susquehanna International Group LLP, Concourse Financial Group Securities Inc., PEAK6 LLC, and Walleye Trading LLC. These positions are disclosed in Form 13F filings with the Securities and Exchange Commission. What is a good short interest percentage for MKS Instruments? 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. 4.73% of MKS Instruments' floating shares are currently sold short. Is MKS Instruments' short interest increasing or decreasing? MKS Instruments saw a decline in short interest in the month of February. As of February 28th, there was short interest totaling 3,170,000 shares, a decline of 2.8% from the previous total of 3,260,000 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 MKS Instruments' short interest compare to its competitors? 4.73% of MKS Instruments' shares are currently sold short. Here is how the short interest of companies compare to MKS Instruments: Entegris, Inc. (5.26%), Onto Innovation Inc. (3.09%), Amkor Technology, Inc. (5.47%), Advanced Energy Industries, Inc. (6.00%), FormFactor, Inc. (4.73%), Axcelis Technologies, Inc. (14.16%), Photronics, Inc. (4.15%), Veeco Instruments Inc. (9.60%), Ultra Clean Holdings, Inc. (2.24%), PDF Solutions, Inc. (1.83%), Which stocks are the most shorted right now? As of the most recent reporting period, the following stocks had the largest short interest positions: Invesco QQQ ($23.74 billion), iShares 20+ Year Treasury Bond ETF ($10.75 billion), MicroStrategy Incorporated ($6.56 billion), Apollo Global Management, Inc. ($5.40 billion), Charter Communications, Inc. ($4.57 billion), AppLovin Co. ($4.45 billion), Capital One Financial Co. ($4.33 billion), Super Micro Computer, Inc. ($4.23 billion), Schlumberger Limited ($3.22 billion), and Royal Caribbean Cruises Ltd. ($3.06 billion). View all of the most shorted stocks. What does it mean to sell short MKS Instruments stock? Short selling MKSI is an investing strategy that aims to generate trading profit from MKS Instruments as its price is falling. MKSI shares are trading down $1.24 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 MKS Instruments? A short squeeze for MKS Instruments 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 MKSI, which in turn drives the price of the stock up even further. How often is MKS Instruments' 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 MKSI, twice per month. The most recent reporting period available is February, 28 2025. More Short Interest Resources from MarketBeat Related Companies ENTG Short Interest Data ONTO Short Interest Data AMKR Short Interest Data AEIS Short Interest Data FORM Short Interest Data ACLS Short Interest Data PLAB Short Interest Data VECO Short Interest Data UCTT Short Interest Data PDFS Short Interest Data Short Interest Tools Stocks to Short Largest Short Interest Positions Short Interest Increases Short Interest Decreases Short Interest Reporting Dates This page (NASDAQ:MKSI) was last updated on 3/25/2025 by MarketBeat.com Staff From Our PartnersYour Wealth is Under AttackPlease don't wait—this is your moment to take action. 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