Axcelis Technologies (ACLS) Short Interest Ratio & Short Volume $47.48 +0.43 (+0.91%) As of 04/14/2025 04:00 PM Eastern Add Compare Share Share Short Interest Stock AnalysisAnalyst ForecastsChartCompetitorsEarningsFinancialsHeadlinesInsider TradesOptions ChainOwnershipSEC FilingsShort InterestSustainabilityTrendsBuy This Stock Axcelis Technologies Short Interest DataAxcelis Technologies (ACLS) has a short interest of 4.68 million shares, representing 14.80% of the float (the number of shares available for trading by the public). This marks a -0.43% decrease in short interest from the previous month. The short interest ratio (days to cover) is 6.5, indicating that it would take 6.5 days of the average trading volume of 636,947 shares to cover all short positions.Current Short Interest4,680,000 sharesPrevious Short Interest4,700,000 sharesChange Vs. Previous Month-0.43%Dollar Volume Sold Short$232.46 millionShort Interest Ratio6.5 Days to CoverLast Record DateMarch 31, 2025Outstanding Shares32,181,000 sharesFloat Size31,630,000 sharesShort Percent of Float14.80%Today's Trading Volume586,882 sharesAverage Trading Volume636,947 sharesToday's Volume Vs. Average92% Short Selling Axcelis Technologies? Sign up to receive the latest short interest report for Axcelis Technologies and its competitors with MarketBeat's FREE newsletter. Email Address Skip Charts & View Short Interest HistoryShort Interest ChartDays to Cover ChartShort Percent of Float ChartACLS Short Interest Over TimeACLS Days to Cover Over TimeACLS Percentage of Float Shorted Over Time Remove Ads Axcelis Technologies Short Interest History Export to ExcelReport DateTotal Shares Sold ShortDollar Volume Sold ShortChange from Previous ReportPercentage of Float ShortedDays to CoverPrice on Report Date 3/31/20254,680,000 shares $232.46 million -0.4%14.8%6.5 $49.67 3/15/20254,700,000 shares $274.81 million +4.9%14.9%7 $58.47 2/28/20254,480,000 shares $245.15 million -5.7%14.2%6.9 $54.72 2/15/20254,750,000 shares $290.04 million +1.3%14.9%7.6 $61.06 1/31/20254,690,000 shares $318.92 million +3.5%14.7%7.1 $68.00 1/15/20254,530,000 shares $325.12 million +2.0%14.2%7.5 $71.77 12/31/20244,440,000 shares $310.22 million +1.1%13.9%7 $69.87 12/15/20244,390,000 shares $330.52 million +0.5%13.7%6.9 $75.29 11/30/20244,370,000 shares $324.43 million -1.1%13.7%6.7 $74.24 11/15/20244,420,000 shares $323.63 million +2.6%13.8%6.7 $73.22 Get the Latest News and Ratings for ACLS and Related StocksEnter your email address below to receive the latest news and analysts' ratings for Axcelis Technologies and its competitors with MarketBeat's FREE daily newsletter. 10/31/20244,310,000 shares $367.69 million +140.8%13.5%7.1 $85.31 10/15/20241,790,000 shares $172.91 million -14.8%5.6%2.8 $96.60 9/30/20242,100,000 shares $220.19 million -4.1%6.5%3.2 $104.85 9/15/20242,190,000 shares $226.16 million +7.9%6.8%3.3 $103.27 8/31/20242,030,000 shares $221.94 million -5.6%6.3%3.2 $109.33 8/15/20242,150,000 shares $251.49 million -3.6%6.7%3.4 $116.97 7/31/20242,230,000 shares $281.76 million +7.2%7.0%3.6 $126.35 7/15/20242,080,000 shares $307.57 million -5.0%6.5%3.7 $147.87 6/30/20242,190,000 shares $311.40 million +19.7%6.8%4.1 $142.19 6/15/20241,830,000 shares $253.88 million -24.1%5.7%3.5 $138.73 5/31/20242,410,000 shares $271.10 million +26.2%7.5%4.7 $112.49 5/15/20241,910,000 shares $215.72 million -5.9%6.0%3.6 $112.94 4/30/20242,030,000 shares $210.15 million +0.5%6.3%3.2 $103.52 4/15/20242,020,000 shares $210.75 million +2.5%6.3%3.1 $104.33 3/31/20241,970,000 shares $219.69 million -2.5%6.1%2.8 $111.52 3/15/20242,020,000 shares $217.37 million +22.4%6.3%2.9 $107.61 2/29/20241,650,000 shares $185.91 million +5.8%5.1%2.2 $112.67 2/15/20241,560,000 shares $186.05 million +4.0%4.9%2.2 $119.26 1/31/20241,500,000 shares $195.08 million -10.2%4.7%2.1 $130.05 1/15/20241,670,000 shares $190.58 million +21.0%5.2%2.5 $114.12 12/31/20231,380,000 shares $178.97 million -17.4%4.3%2.2 $129.69 12/15/20231,670,000 shares $227.27 million +1.8%5.2%2.8 $136.09 11/30/20231,640,000 shares $203.82 million +7.9%5.1%2.7 $124.28 11/15/20231,520,000 shares $209.33 million -1.9%4.7%2.6 $137.72 10/31/20231,550,000 shares $197.63 million No Change4.8%2.8 $127.50 10/15/20231,550,000 shares $248.57 million +2.7%4.8%2.9 $160.37 9/30/20231,510,000 shares $246.21 million +25.8%4.7%2.9 $163.05 9/15/20231,200,000 shares $200.72 million -11.8%3.7%2.3 $167.27 8/31/20231,360,000 shares $261.32 million +13.3%4.2%2.7 $192.15 8/15/20231,200,000 shares $203.53 million -9.8%3.7%2.3 $169.61Elon Reveals Why There Soon Won’t Be Any Money For Social Security (Ad)Elon Musk's Near-Death Experience Sparks Dire Warning for Americans After cheating death twice—once in a terrifying supercar crash with billionaire Peter Thiel, then from a deadly strain of malaria—Elon Musk emerged with a stark warning for Americans about looming financial dangers. Discover the little-known Trump IRS loophole that thousands are now using to safeguard their retirement from inflation and market turmoil—before it's too late.See why thousands of forward-thinking retirement savers are now requesting this FREE 2025 Wealth Pro 7/31/20231,330,000 shares $266.64 million -18.9%4.1%2.5 $200.48 7/15/20231,640,000 shares $294.95 million -10.4%5.1%3.1 $179.85 6/30/20231,830,000 shares $335.49 million -7.6%5.7%3.5 $183.33 6/15/20231,980,000 shares $338.52 million +13.8%6.2%3.7 $170.97 5/31/20231,740,000 shares $274.14 million +16.0%5.4%3.2 $157.55 5/15/20231,500,000 shares $191.99 million -5.7%4.7%2.6 $127.99 4/30/20231,590,000 shares $188.10 million +6.7%4.9%2.6 $118.30 4/15/20231,490,000 shares $190.24 million -5.7%4.6%2.4 $127.68 3/31/20231,580,000 shares $210.54 million +6.0%5.0%2.5 $133.25 3/15/20231,490,000 shares $184.55 million -21.6%4.7%2.5 $123.86 2/28/20231,900,000 shares $244.23 million +27.5%6.0%3.5 $128.54 2/15/20231,490,000 shares $191.99 million +9.6%4.7%3 $128.85 1/31/20231,360,000 shares $149.53 million +18.3%4.3%3 $109.95 1/15/20231,150,000 shares $115.59 million -13.5%3.6%2.9 $100.51 12/30/20221,330,000 shares $105.55 million +17.7%4.2%3.4 $79.36 12/15/20221,130,000 shares $93.52 million +17.4%3.5%2.9 $82.76 11/30/2022962,200 shares $76.84 million -14.9%3.0%2.6 $79.86 11/15/20221,130,000 shares $88.25 million -10.3%3.5%2.5 $78.10 10/31/20221,260,000 shares $73.08 million -9.4%4.0%2.6 $58.00 10/15/20221,390,000 shares $71.88 million +23.0%4.3%2.9 $51.71 9/30/20221,130,000 shares $68.43 million +2.7%3.5%2.4 $60.56 9/15/20221,100,000 shares $67.91 million +0.9%3.4%2.3 $61.74 8/31/20221,090,000 shares $72.96 million +0.9%3.4%2.3 $66.94 8/15/20221,080,000 shares $82.46 million No Change3.4%2.7 $76.35 7/31/20221,080,000 shares $75.96 million -3.6%3.4%2.9 $70.33 7/15/20221,120,000 shares $62.94 million +9.8%3.5%3.1 $56.20 6/30/20221,020,000 shares $55.94 million -23.3%3.2%2.6 $54.84 6/15/20221,330,000 shares $74.49 million +8.1%4.2%3.1 $56.01 5/31/20221,230,000 shares $76.33 million -7.5%3.8%2.6 $62.06 5/15/20221,330,000 shares $78.00 million +11.8%4.2%2.6 $58.65 4/30/20221,190,000 shares $64.80 million +14.4%3.7%2.2 $54.45 4/15/20221,040,000 shares $58.69 million +3.0%3.2%2 $56.43 3/31/20221,010,000 shares $76.29 million +5.4%3.1%1.9 $75.53 3/15/2022958,500 shares $61.76 million +39.5%3.0%2 $64.43 2/28/2022686,900 shares $47.55 million -13.2%2.1%1.5 $69.22 2/15/2022791,000 shares $55.69 million +2.5%2.5%1.7 $70.40 1/31/2022772,100 shares $48.34 million -3.1%2.4%1.7 $62.61 1/15/2022796,500 shares $56.86 million -16.4%2.5%1.8 $71.39 12/31/2021952,800 shares $71.04 million -1.4%3.0%2.2 $74.56 12/15/2021966,300 shares $64.98 million +32.4%3.0%2.6 $67.25 11/30/2021729,700 shares $45.11 million +1.6%2.3%2.2 $61.82 11/15/2021718,100 shares $44.39 million -32.9%2.2%2.3 $61.81 10/29/20211,070,000 shares $58.78 million -1.8%3.3%3.9 $54.93 10/15/20211,090,000 shares $53.81 million -0.9%3.4%4.5 $49.37 9/30/20211,100,000 shares $51.73 million -9.8%3.4%4.9 $47.03 9/15/20211,220,000 shares $60.02 million +14.0%3.8%5.5 $49.20 8/31/20211,070,000 shares $53.19 million +18.2%3.3%4.8 $49.71 8/13/2021905,300 shares $38.99 million +9.4%2.8%4.7 $43.07 7/30/2021827,900 shares $31.92 million -0.8%2.6%3.9 $38.55 7/15/2021834,800 shares $29.55 million +11.7%2.6%3.8 $35.40Elon Reveals Why There Soon Won’t Be Any Money For Social Security (Ad)Elon Musk's Near-Death Experience Sparks Dire Warning for Americans After cheating death twice—once in a terrifying supercar crash with billionaire Peter Thiel, then from a deadly strain of malaria—Elon Musk emerged with a stark warning for Americans about looming financial dangers. Discover the little-known Trump IRS loophole that thousands are now using to safeguard their retirement from inflation and market turmoil—before it's too late.See why thousands of forward-thinking retirement savers are now requesting this FREE 2025 Wealth Pro 6/30/2021747,200 shares $30.20 million -1.2%2.3%3.1 $40.42 6/15/2021756,500 shares $31.54 million +11.5%2.3%2.6 $41.69 5/28/2021678,400 shares $28.11 million +10.4%2.1%2.1 $41.44 5/14/2021614,700 shares $22.79 million -9.7%1.9%1.7 $37.07 4/30/2021680,900 shares $29.23 million -12.1%2.1%1.7 $42.93 4/15/2021774,300 shares $33.68 million +9.4%2.4%2 $43.50 3/31/2021707,800 shares $27.06 million -15.2%2.2%1.6 $38.23 3/15/2021834,400 shares $33.20 million -14.3%2.6%2 $39.79 2/26/2021973,100 shares $35.58 million +9.5%3.0%2.6 $36.56 2/12/2021888,400 shares $34.58 million -8.5%2.7%2.4 $38.92 1/29/2021971,200 shares $35.12 million -15.6%3.0%2.7 $36.16 1/15/20211,150,000 shares $42.76 million +45.2%3.6%3.3 $37.18 12/31/2020791,900 shares $22.99 million +16.9%2.5%2.8 $29.03 12/15/2020677,700 shares $19.31 million +22.4%2.1%2.6 $28.49 11/30/2020553,700 shares $15.07 million -11.7%1.7%1.9 $27.22 11/15/2020627,200 shares $16.31 million -14.4%1.9%2.2 $26.01 10/30/2020732,900 shares $16.53 million -0.4%2.3%2.5 $22.56 10/15/2020735,800 shares $17.87 million +7.5%2.3%2.1 $24.28 9/30/2020684,500 shares $15.06 million -5.3%2.1%1.9 $22.00 9/15/2020722,900 shares $15.46 million -3.7%2.2%1.9 $21.38 8/31/2020750,400 shares $17.73 million -15.3%2.3%2 $23.63 8/14/2020885,400 shares $23.68 million -7.4%2.7%2.1 $26.74 7/31/2020955,800 shares $28.12 million -8.1%3.0%2.2 $29.42 7/15/20201,040,000 shares $28.88 million -11.9%3.3%2.5 $27.77 6/30/20201,180,000 shares $31.72 million +7.3%3.7%2.9 $26.88 6/15/20201,100,000 shares $29.05 million +2.8%3.5%2.8 $26.41 5/29/20201,070,000 shares $28.73 million +1.9%3.4%2.7 $26.85 5/15/20201,050,000 shares $24.70 million -2.8%3.3%2.9 $23.52 4/30/20201,080,000 shares $25.23 million +6.9%3.4%3 $23.36 4/15/20201,010,000 shares $21.70 million -10.6%3.2%3.1 $21.49 ACLS Short Interest - Frequently Asked Questions What is Axcelis Technologies' current short interest? Short interest is the volume of Axcelis Technologies shares that have been sold short but have not yet been covered or closed out. As of March 31st, traders have sold 4,680,000 shares of ACLS short. 14.80% of Axcelis Technologies' shares are currently sold short. Learn More on Axcelis Technologies' current short interest. What is a good short interest ratio for Axcelis Technologies? 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. ACLS shares currently have a short interest ratio of 6.0. Learn More on Axcelis Technologies's short interest ratio. Which institutional investors are shorting Axcelis Technologies? As of the most recent reporting period, the following institutional investors, funds, and major shareholders have reported short positions of Axcelis Technologies: IMC Chicago LLC, Wolverine Trading LLC, Group One Trading LLC, D. E. Shaw & Co. Inc., Cubist Systematic Strategies LLC, Citadel Advisors LLC, Jane Street Group LLC, Tudor Investment Corp ET AL, Two Sigma Securities LLC, Susquehanna International Group LLP, Concourse Financial Group Securities Inc., PEAK6 LLC, Walleye Trading LLC, Walleye Capital LLC, and Capital Fund Management S.A.. These positions are disclosed in Form 13F filings with the Securities and Exchange Commission. What is a good short interest percentage for Axcelis Technologies? 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. 14.80% of Axcelis Technologies' floating shares are currently sold short. Is Axcelis Technologies' short interest increasing or decreasing? Axcelis Technologies saw a decrease in short interest during the month of March. As of March 31st, there was short interest totaling 4,680,000 shares, a decrease of 0.4% from the previous total of 4,700,000 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. What is Axcelis Technologies' float size? Axcelis Technologies currently has issued a total of 32,181,000 shares. Some of Axcelis Technologies' outstanding shares are available for trading, while others are subject to various restrictions. The public float, also referred to as floating shares or "the float", are shares that publicly owned, unrestricted and available to trade on the open market. Axcelis Technologies currently has a public float of 31,630,000 shares. How does Axcelis Technologies' short interest compare to its competitors? 14.80% of Axcelis Technologies' shares are currently sold short. Here is how the short interest of companies compare to Axcelis Technologies: Onto Innovation Inc. (3.07%), MKS Instruments, Inc. (5.40%), Amkor Technology, Inc. (6.05%), Advanced Energy Industries, Inc. (6.93%), FormFactor, Inc. (4.23%), Photronics, Inc. (4.45%), Veeco Instruments Inc. (8.52%), Ultra Clean Holdings, Inc. (2.47%), PDF Solutions, Inc. (2.00%), Cohu, Inc. (3.05%), 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 ($21.93 billion), iShares 20+ Year Treasury Bond ETF ($9.31 billion), Strategy Incorporated ($8.42 billion), Charter Communications, Inc. ($4.52 billion), Apollo Global Management, Inc. ($4.26 billion), Super Micro Computer, Inc. ($3.98 billion), Capital One Financial Co. ($3.79 billion), TC Energy Co. ($3.43 billion), AppLovin Co. ($2.91 billion), and Schlumberger Limited ($2.89 billion). View all of the most shorted stocks. What does it mean to sell short Axcelis Technologies stock? Short selling ACLS is an investing strategy that aims to generate trading profit from Axcelis Technologies as its price is falling. ACLS shares are trading up $0.43 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 Axcelis Technologies? A short squeeze for Axcelis Technologies 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 ACLS, which in turn drives the price of the stock up even further. How often is Axcelis Technologies' 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 ACLS, twice per month. The most recent reporting period available is March, 31 2025. More Short Interest Resources from MarketBeat Related Companies ONTO Short Interest Data MKSI Short Interest Data AMKR Short Interest Data AEIS Short Interest Data FORM Short Interest Data PLAB Short Interest Data VECO Short Interest Data UCTT Short Interest Data PDFS Short Interest Data COHU 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:ACLS) was last updated on 4/15/2025 by MarketBeat.com Staff From Our Partners[Action Required] Claim Your FREE IRS Loophole GuideThis shouldn't surprise anyone who's been paying attention, but... Pres. 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