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Axcelis Technologies (ACLS) Short Interest Ratio & Short Volume

Axcelis Technologies logo
$139.70 -2.17 (-1.53%)
Closing price 04:00 PM Eastern
Extended Trading
$142.72 +3.03 (+2.17%)
As of 04:28 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 Massive. Learn more.
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Axcelis Technologies Short Interest Overview

As of April 15, 2026, Axcelis Technologies (ACLS) had a short interest of 3.50 million shares sold short, representing 11.45% of the public float. This marks a -7.78% decrease in short interest since the prior report. The short interest ratio (days to cover) is 6.1, meaning it would take 6.1 days of the average trading volume of 771,543 shares to cover all short positions.

Current Short Interest
3,501,747 shares
Previous Short Interest
3,797,370 shares
Change Vs. Previous Month
-7.78%
Dollar Volume Sold Short
$412.79 million
Short Interest Ratio
6.1 Days to Cover
Last Record Date
April 15, 2026
Outstanding Shares
30,730,000 shares
Short Percent of Float
11.45%
Today's Trading Volume
919,451 shares
Average Trading Volume
771,543 shares
Today's Volume Vs. Average
119%
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Short Interest ChartDays to Cover ChartShort Percent of Float Chart

ACLS Short Interest Over Time

ACLS Days to Cover Over Time

ACLS Percentage of Float Shorted Over Time

Axcelis Technologies Tesla Short Interest History & Recent Changes

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Report DateTotal Shares Sold ShortDollar Volume Sold ShortChange from Previous ReportPercentage of Float ShortedDays to CoverPrice on Report Date
4/15/20263,501,747 shares $412.79 million -7.8%11.5%6.09 $117.88
3/31/20263,797,370 shares $353.46 million +2.6%12.4%4.99 $93.08
3/13/20263,702,963 shares $308.05 million +0.1%12.1%5.09 $83.19
2/27/20263,698,624 shares $305.54 million -25.9%12.1%2.54 $82.61
2/13/20264,989,876 shares $471.79 million +5.0%16.3%6.44 $94.55
1/30/20264,751,091 shares $418.43 million +2.4%15.6%9.45 $88.07
1/15/20264,639,745 shares $447.74 million +15.7%15.2%7.66 $96.50
12/31/20254,011,398 shares $322.28 million -4.8%13.1%10.77 $80.34
12/15/20254,214,041 shares $367.72 million +3.5%13.7%7.26 $87.26
11/28/20254,071,565 shares $330.09 million +6.7%13.2%8.68 $81.07
11/14/20253,815,940 shares $311.15 million -12.9%12.2%4.94 $81.54
10/31/20254,379,799 shares $348.46 million -2.1%14.0%8.56 $79.56
10/15/20254,470,000 shares $374.45 million +12.9%14.7%7.4 $83.77
9/30/20253,960,000 shares $386.65 million -15.2%13.0%6.9 $97.64
9/15/20254,670,000 shares $407.69 million +2.2%15.2%9 $87.30
8/31/20254,570,000 shares $365.78 million -0.2%14.9%8.5 $80.04
8/15/20254,580,000 shares $368.74 million -13.3%14.9%8.3 $80.51
7/31/20255,280,000 shares $357.40 million -1.5%17.2%9.5 $67.69
7/15/20255,360,000 shares $384.58 million -0.9%17.0%9.3 $71.75
6/30/20255,410,000 shares $377.02 million +2.1%17.2%8.5 $69.69
6/15/20255,300,000 shares $344.87 million -2.6%16.9%8 $65.07
5/31/20255,440,000 shares $305.67 million +4.2%17.3%8 $56.19
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
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 $163.05
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 $169.61
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 $43.07
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

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 15th, traders have sold 3,501,747 shares of ACLS short. 11.45% 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 6.1. 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: PEAK6 LLC, Walleye Trading LLC, PEAK6 LLC, Walleye Capital LLC, Jane Street Group LLC, Group One Trading LLC, Simplex Trading LLC, and JPMorgan Chase & Co.. 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. 11.45% 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 in the month of April. As of April 15th, there was short interest totaling 3,501,747 shares, a decline of 7.8% from the previous total of 3,797,370 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 Axcelis Technologies' short interest compare to its competitors?

11.45% of Axcelis Technologies' shares are currently sold short. Here is how the short interest of companies in the sector of "computer and technology" compare to Axcelis Technologies: Applied Materials, Inc. (1.72%), Cohu, Inc. (7.98%), KLA Corporation (29.92%), Kulicke and Soffa Industries, Inc. (2.28%), Lam Research Corporation (2.09%), MKS Inc. (5.28%), NXP Semiconductors N.V. (3.39%), ON Semiconductor Corporation (7.67%), Veeco Instruments Inc. (10.02%), Onto Innovation Inc. (2.39%),

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 ($87.50 billion), Invesco QQQ ($42.26 billion), iShares Russell 2000 ETF ($24.79 billion), Salesforce Inc. ($13.16 billion), SPDR S&P Biotech ETF ($10.01 billion), Western Digital Corporation ($9.77 billion), Sandisk Corporation ($8.69 billion), iShares 20+ Year Treasury Bond ETF ($8.06 billion), CoreWeave Inc. ($7.67 billion), and iShares iBoxx $ High Yield Corporate Bond ETF ($7.64 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 down $0.91 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 April, 15 2026.

What do ACLs' short interest metrics mean?

Understanding short interest metrics can help you assess how traders are positioning around a stock like ACLS:

  • Shares Sold Short: The total number of shares that have been sold by short sellers but have not yet been covered or closed out. A high number may indicate bearish sentiment.
  • Short Float: The percentage of a company’s publicly available shares (or "float") that are sold short. A higher short float suggests a greater portion of the stock is being bet against.
  • Days to Cover (Short Interest Ratio): This estimates how many days it would take short sellers to cover their positions, based on average daily trading volume. Higher values can signal potential for a short squeeze if buying pressure increases.

These metrics are often used by traders to gauge sentiment, volatility risk, and the potential for price movements based on short covering activity.



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This page (NASDAQ:ACLS) was last updated on 5/5/2026 by MarketBeat.com Staff.
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