Axcelis Technologies (ACLS) Short Interest Ratio & Short Volume $62.46 +0.45 (+0.73%) As of 05/20/2025 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 5.61 million shares, representing 17.75% of the float (the number of shares available for trading by the public). This marks a 5.65% increase in short interest from the previous month. The short interest ratio (days to cover) is 7.3, indicating that it would take 7.3 days of the average trading volume of 649,926 shares to cover all short positions.Current Short Interest5,610,000 sharesPrevious Short Interest5,310,000 sharesChange Vs. Previous Month+5.65%Dollar Volume Sold Short$274.78 millionShort Interest Ratio7.3 Days to CoverLast Record DateApril 30, 2025Outstanding Shares32,130,000 sharesFloat Size31,600,000 sharesShort Percent of Float17.75%Today's Trading Volume424,929 sharesAverage Trading Volume649,926 sharesToday's Volume Vs. Average65% 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 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 4/30/20255,610,000 shares $274.78 million +5.7%17.8%7.3 $48.98 4/15/20255,310,000 shares $250.47 million +13.5%16.8%7.3 $47.17 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 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. 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 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 $167.27Trump wipes out trillions overnight… (Ad)Is there anybody more powerful than Donald Trump right now? In a single tariff announcement, he wiped out nearly $5 trillion in wealth from the S&P 500 and $6.4 trillion from the Dow Jones… Not to mention the countless trillions of dollars lost in every market around the world… leaving the major political powers scrambling in fear of Trump’s next move.Whether you take some of that wealth for yourself depends on if you watch this controversial exposé 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 $169.61 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 $43.07Trump’s treachery (Ad)Trump’s Final Reset Inside the shocking plot to re-engineer America’s financial system…and why you need to move your money now.Millions of Americans are about to be wiped out, while others could make a fortune… click here to ma 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 $35.40 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 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 April 30th, traders have sold 5,610,000 shares of ACLS short. 17.75% 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 7.0. 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: Jane Street Group LLC, Cubist Systematic Strategies LLC, PEAK6 LLC, Walleye Trading LLC, Capital Fund Management S.A., Simplex Trading LLC, and IMC Chicago LLC. 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. 17.75% of Axcelis Technologies' floating shares are currently sold short. Is Axcelis Technologies' short interest increasing or decreasing? Axcelis Technologies saw a increase in short interest in the month of April. As of April 30th, there was short interest totaling 5,610,000 shares, an increase of 5.6% from the previous total of 5,310,000 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 32,130,000 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 31,600,000 shares. How does Axcelis Technologies' short interest compare to its competitors? 17.75% of Axcelis Technologies' shares are currently sold short. Here is how the short interest of companies compare to Axcelis Technologies: MKS Instruments, Inc. (6.14%), Amkor Technology, Inc. (6.86%), Onto Innovation Inc. (4.00%), Advanced Energy Industries, Inc. (6.73%), FormFactor, Inc. (4.41%), Photronics, Inc. (5.25%), Veeco Instruments Inc. (7.99%), Ultra Clean Holdings, Inc. (3.41%), Cohu, Inc. (3.37%), PDF Solutions, Inc. (2.12%), Which stocks are the most shorted right now? As of the most recent reporting period, the following stocks had the largest short interest positions: Spotify Technology S.A. ($4.67 billion), Charter Communications, Inc. ($4.58 billion), Capital One Financial Co. ($4.47 billion), The Kroger Co. ($2.56 billion), Reddit, Inc. ($2.23 billion), Rivian Automotive, Inc. ($2.16 billion), Live Nation Entertainment, Inc. ($1.90 billion), SoFi Technologies, Inc. ($1.85 billion), Zscaler, Inc. ($1.75 billion), and Omnicom Group Inc. ($1.75 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 $0.45 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 increases 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 April, 30 2025. More Short Interest Resources from MarketBeat Related Companies MKSI Short Interest Data AMKR Short Interest Data ONTO Short Interest Data AEIS Short Interest Data FORM Short Interest Data PLAB Short Interest Data VECO Short Interest Data UCTT Short Interest Data COHU 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:ACLS) was last updated on 5/21/2025 by MarketBeat.com Staff From Our PartnersMarket Panic: Trump Just Dropped a Bomb on Your Stockstock Market Panic: Trump Just Dropped a Bomb on Your Stocks The market is in freefall—and Trump's new tarif...American Alternative | SponsoredGold Hits New Highs as Global Markets SpiralWhen Trump took office in 2017, gold was just $1,100 an ounce. 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