Axcelis Technologies (ACLS) Short Interest Ratio & Short Volume $70.76 +3.15 (+4.66%) Closing price 04:00 PM EasternExtended Trading$70.72 -0.04 (-0.05%) As of 07:46 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 ForecastsChartCompetitorsEarningsFinancialsHeadlinesInsider TradesOptions ChainOwnershipSEC FilingsShort InterestSustainabilityTrendsBuy This Stock Axcelis Technologies Short Interest DataAxcelis Technologies (ACLS) has a short interest of 5.22 million shares, representing 16.60% of the float (the number of shares available for trading by the public). This marks a -6.95% decrease in short interest from the previous month. The short interest ratio (days to cover) is 7.6, indicating that it would take 7.6 days of the average trading volume of 654,804 shares to cover all short positions.Current Short Interest5,220,000 sharesPrevious Short Interest5,610,000 sharesChange Vs. Previous Month-6.95%Dollar Volume Sold Short$327.14 millionShort Interest Ratio7.6 Days to CoverLast Record DateMay 15, 2025Outstanding Shares32,130,000 sharesFloat Size31,450,000 sharesShort Percent of Float16.60%Today's Trading Volume1,560,545 sharesAverage Trading Volume654,804 sharesToday's Volume Vs. Average238% 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 5/15/20255,220,000 shares $327.14 million -7.0%16.6%7.6 $62.67 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 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. 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 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 $163.05An AI run of epic proportions is only getting started (Ad)I just put together an urgent new presentation that you need to see right away. In short: I believe we are mere days away from a critical announcement from a key tech leader… One that will officially ignite “AI 2.0” – and potentially send a whole new class of stocks soaring. Click to find out what Nvidia’s CEO might reveal… and how Sykes is preparing to ride the wave. 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 $169.61 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 $49.71An AI run of epic proportions is only getting started (Ad)I just put together an urgent new presentation that you need to see right away. In short: I believe we are mere days away from a critical announcement from a key tech leader… One that will officially ignite “AI 2.0” – and potentially send a whole new class of stocks soaring. Click to find out what Nvidia’s CEO might reveal… and how Sykes is preparing to ride the wave. 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 $35.40 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 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 May 15th, investors have sold 5,220,000 shares of ACLS short. 16.60% 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 8.0. 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. 16.60% of Axcelis Technologies' floating shares are currently sold short. Is Axcelis Technologies' short interest increasing or decreasing? Axcelis Technologies saw a decline in short interest during the month of May. As of May 15th, there was short interest totaling 5,220,000 shares, a decline of 7.0% from the previous total of 5,610,000 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 31,450,000 shares. How does Axcelis Technologies' short interest compare to its competitors? 16.60% of Axcelis Technologies' shares are currently sold short. Here is how the short interest of companies compare to Axcelis Technologies: MKS Instruments, Inc. (6.31%), Onto Innovation Inc. (3.88%), Amkor Technology, Inc. (7.13%), Advanced Energy Industries, Inc. (7.13%), FormFactor, Inc. (4.60%), Veeco Instruments Inc. (8.01%), Photronics, Inc. (4.45%), Ultra Clean Holdings, Inc. (3.27%), Cohu, Inc. (3.77%), PDF Solutions, Inc. (2.25%), 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 ($29.20 billion), Strategy Incorporated ($10.88 billion), iShares 20+ Year Treasury Bond ETF ($10.04 billion), Capital One Financial Co. ($5.51 billion), Charter Communications, Inc. ($5.00 billion), Super Micro Computer, Inc. ($4.43 billion), Apollo Global Management, Inc. ($4.02 billion), Hims & Hers Health, Inc. ($3.65 billion), VanEck Semiconductor ETF ($3.27 billion), and Coinbase Global, Inc. ($3.10 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 $3.43 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 May, 15 2025. More Short Interest Resources from MarketBeat Related Companies MKSI Short Interest Data ONTO Short Interest Data AMKR Short Interest Data AEIS Short Interest Data FORM Short Interest Data VECO Short Interest Data PLAB 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 6/10/2025 by MarketBeat.com Staff From Our PartnersThe Trump Dump is starting; Get out of stocks now?The first 365 days of the Trump presidency… Will be the best time to get rich in American history.Paradigm Press | SponsoredAn AI run of epic proportions is only getting startedI just put together an urgent new presentation that you need to see right away. In short: I believe we are...Timothy Sykes | SponsoredElon’s NEXT Big IPO?Cancel your internet TODAY!? Take your latest internet bill and light it on fire… then count the seconds it...Banyan Hill Publishing | SponsoredSilicon Valley Gold RushA new technology has sparked a modern-day gold rush in Silicon Valley. OpenAI’s Sam Altman invested $375M. Bil...Stansberry Research | SponsoredTrump wipes out trillions overnight…Is there anybody more powerful than Donald Trump right now? In a single tariff announcement, he wiped out n...Porter & Company | SponsoredTrump Nominates “Next Elon”Elon's Replacement? You've been told Elon Musk has been forced out of DC. But did you know his successor ha...Altimetry | SponsoredBig Changes Coming to Social Security?According to legendary investor Louis Navellier... This new Trump move could soon not only save Social Secu...InvestorPlace | SponsoredSHOCKING: Musk's Pentagon Secret Mission...It's about a harrowing message discovered on December 16, 2024: "美国军方暗杀名单" It's the reason President Tru...Behind the Markets | Sponsored Adding Choose a watchlist: Watchlist Adding You have already added five stocks to your watchlist. Upgrade to MarketBeat All Access to add more stocks to your watchlist. Adding Axcelis Technologies, Inc. Please log in to your account or sign up in order to add this asset to your watchlist. Share Axcelis Technologies With A Colleague Link copied to clipboard. Get 30 Days of MarketBeat All Access for Free Sign up for MarketBeat All Access to gain access to MarketBeat's full suite of research tools. Start Your 30-Day Trial MarketBeat All Access Features Best-in-Class Portfolio Monitoring Get personalized stock ideas. Compare portfolio to indices. Check stock news, ratings, SEC filings, and more. Stock Ideas and Recommendations See daily stock ideas from top analysts. Receive short-term trading ideas from MarketBeat. Identify trending stocks on social media. Advanced Stock Screeners and Research Tools Use our seven stock screeners to find suitable stocks. Stay informed with MarketBeat's real-time news. Export data to Excel for personal analysis. Sign in to your free account to enjoy these benefits In-depth profiles and analysis for 20,000 public companies. Real-time analyst ratings, insider transactions, earnings data, and more. Our daily ratings and market update email newsletter. Sign in to your free account to enjoy all that MarketBeat has to offer. Sign In Create Account Your Email Address: Email Address Required Your Password: Password Required Log In or Sign in with Facebook Sign in with Google Forgot your password? Your Email Address: Please enter your email address. Please enter a valid email address Choose a Password: Please enter your password. Your password must be at least 8 characters long and contain at least 1 number, 1 letter, and 1 special character. Create My Account (Free) or Sign in with Facebook Sign in with Google By creating a free account, you agree to our terms of service. This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
Buy ACLS Stock Free ACLS Stock Alerts