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AtriCure (ATRC) Short Interest Ratio & Short Volume

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$56.87 -0.41 (-0.72%)
Closing price 10/13/2026 04:00 PM Eastern
Extended Trading
$56.87 0.00 (0.00%)
As of 10/13/2026 07:30 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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AtriCure Short Interest Overview

As of September 30, 2026, AtriCure (ATRC) had a short interest of 4.82 million shares sold short, representing 9.87% of the public float. This marks a 12.60% increase in short interest since the prior report. The short interest ratio (days to cover) is 2.6, meaning it would take 2.6 days of the average trading volume of 1.51 million shares to cover all short positions.

Current Short Interest
4,818,782 shares
Previous Short Interest
4,279,518 shares
Change Vs. Previous Month
12.60%
Dollar Volume Sold Short
$270.82 million
Short Interest Ratio
2.6 Days to Cover
Last Record Date
September 30, 2026
Outstanding Shares
50,870,000 shares
Short Percent of Float
9.87%
Today's Trading Volume
596,096 shares
Average Trading Volume
1,513,850 shares
Today's Volume Vs. Average
39%
Short Selling AtriCure?
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Short Interest ChartDays to Cover ChartShort Percent of Float Chart

ATRC Short Interest Over Time

ATRC Days to Cover Over Time

ATRC Percentage of Float Shorted Over Time

AtriCure 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
9/30/20264,818,782 shares $270.82 million +12.6%9.9%2.61 $56.20
9/15/20264,279,518 shares $240.59 million +3.3%8.8%3.62 $56.22
8/31/20264,141,306 shares $200.23 million +5.6%8.5%5.76 $48.35
8/14/20263,922,615 shares $173.77 million +1.5%8.0%6.1 $44.30
7/31/20263,864,377 shares $145.92 million -20.6%7.9%3.72 $37.76
7/15/20264,864,713 shares $168.03 million +9.3%10.0%5.68 $34.54
6/30/20264,449,392 shares $124.49 million +29.2%9.2%3.56 $27.98
6/15/20263,443,829 shares $96.36 million +1.3%7.1%4.87 $27.98
5/29/20263,400,672 shares $94.10 million -23.2%7.0%4.03 $27.67
5/15/20264,430,275 shares $124.58 million +14.8%9.1%4.52 $28.12
4/30/20263,857,819 shares $108.44 million +6.8%7.9%4.76 $28.11
4/15/20263,613,453 shares $106.13 million +2.1%7.4%5.65 $29.37
3/31/20263,540,034 shares $101.00 million +3.7%7.3%6.31 $28.53
3/13/20263,414,361 shares $101.88 million +8.5%7.1%5.6 $29.84
2/27/20263,147,385 shares $98.39 million -8.7%6.5%4.02 $31.26
2/13/20263,447,589 shares $112.56 million +37.3%7.1%3.74 $32.65
1/30/20262,510,177 shares $92.70 million +0.0%5.2%5.41 $36.93
1/15/20262,509,848 shares $104.06 million +6.1%5.2%4.25 $41.46
12/31/20252,366,606 shares $93.62 million -5.3%4.9%7.21 $39.56
12/15/20252,499,141 shares $102.56 million +8.7%5.2%4.02 $41.04
11/28/20252,299,662 shares $83.06 million -10.0%4.8%4.44 $36.12
11/14/20252,553,773 shares $84.02 million +10.9%5.3%4.61 $32.90
10/31/20252,303,562 shares $79.61 million +12.6%4.8%3.94 $34.56
10/15/20252,050,000 shares $75.91 million -7.2%4.3%4.2 $37.03
9/30/20252,210,000 shares $77.90 million +7.3%N/A4.5 $35.25
9/15/20252,060,000 shares $71.34 million -1.0%N/A4 $34.63
8/31/20252,080,000 shares $76.94 million +6.7%4.3%4.2 $36.99
8/15/20251,950,000 shares $69.13 million -12.2%N/A3.8 $35.45
7/31/20252,220,000 shares $77.92 million +46.1%4.6%4.1 $35.10
7/15/20251,520,000 shares $46.42 million -1.9%N/A2.8 $30.54
6/30/20251,550,000 shares $50.79 million -0.6%3.2%2.8 $32.77
6/15/20251,560,000 shares $49.33 million -14.8%3.3%2.7 $31.62
5/31/20251,830,000 shares $63.21 million +17.3%3.9%3 $34.54
5/15/20251,560,000 shares $50.39 million +2.0%3.3%2.5 $32.30
4/30/20251,530,000 shares $45.76 million +14.2%N/A2.4 $29.91
4/15/20251,340,000 shares $43.36 million No Change2.8%2.4 $32.36
3/31/20251,340,000 shares $43.23 million -21.2%2.8%2.2 $32.26
3/15/20251,700,000 shares $56.63 million +19.7%3.6%3 $33.31
2/28/20251,420,000 shares $55.01 million +10.9%3.0%2.7 $38.74
2/15/20251,280,000 shares $52.40 million +9.4%2.7%2.6 $40.94
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1/31/20251,170,000 shares $46.65 million -20.4%N/A2.4 $39.87
1/15/20251,470,000 shares $54.35 million -9.3%N/A2.7 $36.97
12/31/20241,620,000 shares $49.51 million +1.3%N/A3.2 $30.56
12/15/20241,600,000 shares $50.67 million -5.3%N/A3.1 $31.67
11/30/20241,690,000 shares $61.11 million +1.2%N/A3.1 $36.16
11/15/20241,670,000 shares $58.50 million -25.8%N/A2.9 $35.03
10/31/20242,250,000 shares $74.66 million -31.6%N/A3.8 $33.18
10/15/20243,290,000 shares $94.13 million -8.4%N/A5.3 $28.61
9/30/20243,590,000 shares $100.66 million +1.1%N/A4.9 $28.04
9/15/20243,550,000 shares $100.15 million -0.8%N/A4.4 $28.21
8/31/20243,580,000 shares $93.83 million -1.7%N/A4.1 $26.21
8/15/20243,640,000 shares $87.03 million +17.0%N/A4.1 $23.91
7/31/20243,110,000 shares $67.08 million -14.3%N/A3.5 $21.57
7/15/20243,630,000 shares $86.32 million -1.6%N/A4.2 $23.78
6/30/20243,690,000 shares $84.02 million +11.8%N/A4.4 $22.77
6/15/20243,300,000 shares $68.51 million -6.5%N/A4.1 $20.76
5/31/20243,530,000 shares $79.57 million +14.2%N/A4.7 $22.54
5/15/20243,090,000 shares $68.35 million +3.7%N/A3.9 $22.12
4/30/20242,980,000 shares $71.88 million -6.9%N/A3.8 $24.12
4/15/20243,200,000 shares $73.28 million -1.5%N/A4.5 $22.90
3/31/20243,250,000 shares $98.87 million +9.4%N/A4.9 $30.42
3/15/20242,970,000 shares $95.46 million +25.3%N/A4.8 $32.14
2/29/20242,370,000 shares $82.88 million +1.3%N/A4.1 $34.97
2/15/20242,340,000 shares $80.05 million +5.4%N/A3.9 $34.21
1/31/20242,220,000 shares $75.61 million +15.0%N/A4.1 $34.06
1/15/20241,930,000 shares $67.53 million +12.2%N/A3.6 $34.99
12/31/20231,720,000 shares $61.39 million -11.3%N/A3.3 $35.69
12/15/20231,940,000 shares $69.18 million -1.0%N/A3.9 $35.66
11/30/20231,960,000 shares $69.54 million +21.0%N/A4.2 $35.48
11/15/20231,620,000 shares $68.90 million +18.3%N/A4.5 $42.53
10/31/20231,370,000 shares $47.46 million +16.1%N/A4 $34.64
10/15/20231,180,000 shares $43.18 million -4.8%N/A3.6 $36.59
9/30/20231,240,000 shares $54.31 million -7.5%N/A3.8 $43.80
9/15/20231,340,000 shares $59.83 million +8.9%N/A4.3 $44.65
8/31/20231,230,000 shares $55.53 million +35.1%N/A4 $45.15
8/15/2023910,700 shares $47.27 million +14.3%N/A3.1 $51.90
7/31/2023796,700 shares $44.10 million -22.7%N/A2.8 $55.35
7/15/20231,030,000 shares $54.32 million -9.7%N/A3.6 $52.74
6/30/20231,140,000 shares $56.27 million -22.5%N/A4.3 $49.36
6/15/20231,470,000 shares $72.21 million -16.0%N/A5.3 $49.12
5/31/20231,750,000 shares $78.70 million +2.9%N/A5.8 $44.97
5/15/20231,700,000 shares $81.52 million -3.4%N/A5.1 $47.95
4/30/20231,760,000 shares $77.42 million +2.9%N/A5 $43.99
4/15/20231,710,000 shares $72.59 million No Change3.8%5 $42.45
3/31/20231,710,000 shares $70.88 million +1.8%3.8%5 $41.45
3/15/20231,680,000 shares $65.76 million -6.7%3.7%5 $39.14
2/28/20231,800,000 shares $69.30 million +13.2%4.0%5.9 $38.50
2/15/20231,590,000 shares $67.42 million +34.8%3.5%5.5 $42.40
1/31/20231,180,000 shares $51.07 million -8.5%2.6%4.6 $43.28
1/15/20231,290,000 shares $55.64 million -10.4%2.8%4.8 $43.13
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12/30/20221,440,000 shares $63.91 million +18.0%3.2%5 $44.38
12/15/20221,220,000 shares $51.81 million -5.4%2.7%4.1 $42.47
11/30/20221,290,000 shares $58.77 million -2.3%2.9%4.4 $45.56
11/15/20221,320,000 shares $62.63 million +9.1%2.9%4.3 $47.45
10/31/20221,210,000 shares $50.97 million -11.0%2.7%4.1 $42.12
10/15/20221,360,000 shares $45.53 million -15.5%3.0%5.1 $33.48
9/30/20221,610,000 shares $62.95 million -4.7%3.6%6.3 $39.10
9/15/20221,690,000 shares $77.57 million -12.0%3.8%6.6 $45.90
8/31/20221,920,000 shares $87.59 million +19.3%4.3%7.4 $45.62
8/15/20221,610,000 shares $84.72 million -4.2%3.6%6.3 $52.62
7/31/20221,680,000 shares $83.01 million -7.7%3.7%6 $49.41
7/15/20221,820,000 shares $79.63 million +1.7%4.1%6.2 $43.75
6/30/20221,790,000 shares $73.14 million -5.8%4.0%6.2 $40.86
6/15/20221,900,000 shares $68.21 million +11.1%5.2%6.8 $35.90
5/31/20221,710,000 shares $69.48 million -5.0%3.8%6.7 $40.63
5/15/20221,800,000 shares $77.20 million +7.1%4.0%7 $42.89
4/30/20221,680,000 shares $87.24 million +5.7%3.7%6.6 $51.93
4/15/20221,590,000 shares $90.71 million +2.6%3.5%6.7 $57.05
3/31/20221,550,000 shares $101.79 million -1.3%3.5%6.2 $65.67
3/15/20221,570,000 shares $92.68 million +5.4%3.5%6.1 $59.03
2/28/20221,490,000 shares $103.48 million +4.2%3.3%5.5 $69.45
2/15/20221,430,000 shares $93.67 million +5.9%3.2%5.1 $65.50
1/31/20221,350,000 shares $88.61 million -0.7%3.0%5 $65.64
1/15/20221,360,000 shares $89.00 million +14.3%3.1%5.1 $65.44
12/31/20211,190,000 shares $82.74 million +10.2%2.7%4.8 $69.53
12/15/20211,080,000 shares $75.14 million +3.9%2.4%4.8 $69.57
11/30/20211,040,000 shares $65.94 million +49.9%2.3%5 $63.40
11/15/2021693,900 shares $52.04 million -26.0%1.6%3.7 $75.00
10/29/2021937,400 shares $70.36 million -2.9%2.1%4.7 $75.06
10/15/2021965,300 shares $68.89 million -6.3%2.2%4.8 $71.37

ATRC Short Interest - Frequently Asked Questions

Short interest is the volume of AtriCure shares that have been sold short but have not yet been covered or closed out. As of September 30th, traders have sold 4,818,782 shares of ATRC short. 9.87% of AtriCure's shares are currently sold short. Learn More on AtriCure's current short interest.

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. ATRC shares currently have a short interest ratio of 2.6. Learn More on AtriCure's short interest ratio.

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. 9.87% of AtriCure's floating shares are currently sold short.

AtriCure saw a increase in short interest in the month of September. As of September 30th, there was short interest totaling 4,818,782 shares, an increase of 12.6% from the previous total of 4,279,518 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.

9.87% of AtriCure's shares are currently sold short. Here is how the short interest of companies in the industry of "healthcare equipment" compare to AtriCure: Globus Medical, Inc. (7.70%), Glaukos Corporation (6.94%), Insulet Corporation (7.75%), MiniMed Group Inc (6.47%), Teleflex Incorporated (9.63%), Haemonetics Corporation (6.82%), Integer Holdings Corporation (9.32%), LivaNova PLC (10.93%), iRhythm Technologies (9.29%), Pulse Biosciences, Inc (17.99%),

As of the most recent reporting period, the following stocks had the largest short interest positions: SPDR S&P 500 ETF Trust ($75.10 billion), Invesco QQQ ($52.12 billion), iShares Russell 2000 ETF ($25.28 billion), SPDR S&P Biotech ETF ($11.70 billion), Nebius Group N.V. ($10.54 billion), iShares iBoxx $ Investment Grade Corporate Bond ETF ($9.69 billion), iShares iBoxx $ High Yield Corporate Bond ETF ($9.22 billion), iShares 20+ Year Treasury Bond ETF ($8.80 billion), Financial Select Sector SPDR Fund ($7.65 billion), and Lumentum Holdings Inc. ($7.23 billion). View all of the most shorted stocks.

Short selling ATRC is an investing strategy that aims to generate trading profit from AtriCure as its price is falling. ATRC shares are trading down $0.41 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.

A short squeeze for AtriCure 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 ATRC, which in turn drives the price of the stock up even further.

Short interest is typically published by a stock exchange once per month. However, NASDAQ publishes a report for U.S. stocks, including ATRC, twice per month. The most recent reporting period available is September, 30 2026.

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

  • 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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Short Interest Tools

Short interest data for NASDAQ:ATRC is sourced from the Financial Industry Regulatory Authority (FINRA), with the most recent report published on 10/9/2026. FINRA publishes updated short interest twice a month.
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