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Iron Mountain (IRM) Short Interest Ratio & Short Volume

Iron Mountain logo
$123.54 -0.42 (-0.34%)
Closing price 05/19/2026 03:59 PM Eastern
Extended Trading
$124.12 +0.58 (+0.47%)
As of 05/19/2026 08:00 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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Iron Mountain Short Interest Overview

As of April 30, 2026, Iron Mountain (IRM) had a short interest of 7.64 million shares sold short, representing 2.61% of the public float. This marks a -4.74% decrease in short interest since the prior report. The short interest ratio (days to cover) is 3.9, meaning it would take 3.9 days of the average trading volume of 1.80 million shares to cover all short positions.

Current Short Interest
7,641,375 shares
Previous Short Interest
8,021,715 shares
Change Vs. Previous Month
-4.74%
Dollar Volume Sold Short
$960.25 million
Short Interest Ratio
3.9 Days to Cover
Last Record Date
April 30, 2026
Outstanding Shares
297,520,000 shares
Short Percent of Float
2.61%
Today's Trading Volume
964,715 shares
Average Trading Volume
1,801,006 shares
Today's Volume Vs. Average
54%
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Short Interest ChartDays to Cover ChartShort Percent of Float Chart

IRM Short Interest Over Time

IRM Days to Cover Over Time

IRM Percentage of Float Shorted Over Time

Iron Mountain 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
4/30/20267,641,375 shares $960.25 million -4.7%2.6%3.89 $125.66
4/15/20268,021,715 shares $911.14 million -2.0%2.7%6.94 $113.58
3/31/20268,188,431 shares $837.08 million -3.3%2.8%5.31 $102.23
3/13/20268,465,576 shares $904.34 million +11.6%2.9%6.17 $106.83
2/27/20267,584,704 shares $821.13 million -3.0%2.6%3.71 $108.26
2/13/20267,821,452 shares $858.18 million -14.6%2.7%3.01 $109.72
1/30/20269,157,943 shares $844.18 million +0.5%3.2%4.8 $92.18
1/15/20269,115,857 shares $844.06 million -5.4%3.1%4.49 $92.59
12/31/20259,637,754 shares $800.42 million -11.6%3.3%4.55 $83.05
12/15/202510,906,244 shares $897.43 million +10.2%3.8%5.64 $82.29
11/28/20259,901,708 shares $814.77 million -0.1%3.4%3.16 $82.29
11/14/20259,914,331 shares $906.96 million +29.2%3.4%4.4 $91.48
10/31/20257,673,493 shares $791.26 million +3.2%2.6%7.77 $103.12
10/15/20257,430,000 shares $786.07 million -7.9%2.6%5.2 $105.80
9/30/20258,070,000 shares $822.82 million -7.0%N/A5.7 $101.96
9/15/20258,680,000 shares $867.38 million +0.4%N/A5.7 $99.93
8/31/20258,650,000 shares $798.23 million +2.6%3.0%5.8 $92.28
8/15/20258,430,000 shares $771.09 million +20.6%N/A5.6 $91.47
7/31/20256,990,000 shares $680.68 million -6.1%2.4%4.5 $97.38
7/15/20257,440,000 shares $723.32 million -6.5%N/A4.8 $97.22
6/30/20257,960,000 shares $815.82 million -24.0%2.8%4.6 $102.49
6/15/202510,470,000 shares $1.06 billion +10.7%3.6%6.3 $101.50
5/31/20259,460,000 shares $933.04 million -16.8%3.3%5.3 $98.63
5/15/202511,370,000 shares $1.13 billion +10.8%4.0%5.9 $99.38
4/30/202510,260,000 shares $921.86 million +8.7%N/A4.8 $89.85
4/15/20259,440,000 shares $785.95 million -2.3%3.3%4.4 $83.26
3/31/20259,660,000 shares $832.10 million +11.7%3.4%4.4 $86.14
3/15/20258,650,000 shares $749.76 million -4.2%3.0%3.9 $86.68
2/28/20259,030,000 shares $841.14 million +4.0%3.1%4.2 $93.15
2/15/20258,680,000 shares $827.59 million +8.0%3.0%4.5 $95.34
1/31/20258,040,000 shares $814.97 million -1.4%N/A4.6 $101.37
1/15/20258,150,000 shares $863.49 million +8.1%N/A4.8 $105.95
12/31/20247,540,000 shares $792.53 million -5.4%N/A4.7 $105.11
12/15/20247,970,000 shares $891.84 million -4.8%N/A5.2 $111.90
11/30/20248,370,000 shares $1.04 billion +0.2%N/A5.7 $123.67
11/15/20248,350,000 shares $959.16 million -9.9%N/A5.8 $114.87
10/31/20249,270,000 shares $1.15 billion +3.6%N/A6.3 $123.70
10/15/20248,950,000 shares $1.09 billion -10.2%N/A5.6 $122.00
9/30/20249,970,000 shares $1.18 billion -12.2%N/A5.9 $118.83
9/15/202411,360,000 shares $1.33 billion +14.5%N/A6.5 $117.06
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8/31/20249,920,000 shares $1.12 billion -13.7%N/A4.9 $113.26
8/15/202411,490,000 shares $1.25 billion -10.0%N/A5.7 $108.50
7/31/202412,760,000 shares $1.31 billion -13.6%N/A6.4 $102.50
7/15/202414,760,000 shares $1.44 billion +0.3%N/A8.3 $97.83
6/30/202414,720,000 shares $1.32 billion +18.0%N/A8.7 $89.62
6/15/202412,470,000 shares $1.10 billion +17.3%N/A7.7 $88.02
5/31/202410,630,000 shares $857.73 million +6.7%N/A8.2 $80.69
5/15/20249,960,000 shares $820.11 million +0.2%N/A7.1 $82.34
4/30/20249,940,000 shares $770.55 million +1.0%N/A7 $77.52
4/15/20249,840,000 shares $736.43 million +0.4%N/A6.9 $74.84
3/31/20249,800,000 shares $786.06 million -6.8%N/A6.8 $80.21
3/15/202410,520,000 shares $826.98 million -0.9%N/A7.2 $78.61
2/29/202410,620,000 shares $835.16 million -0.2%N/A7.2 $78.64
2/15/202410,640,000 shares $735.65 million +5.8%N/A7.7 $69.14
1/31/202410,060,000 shares $679.15 million -8.9%N/A7.4 $67.51
1/15/202411,040,000 shares $742.22 million +1.4%N/A7.5 $67.23
12/31/202310,890,000 shares $762.08 million -11.3%N/A7.2 $69.98
12/15/202312,270,000 shares $833.26 million +6.8%N/A7.9 $67.91
11/30/202311,490,000 shares $737.08 million +2.7%N/A7.1 $64.15
11/15/202311,190,000 shares $695.91 million -6.8%N/A7.1 $62.19
10/31/202312,000,000 shares $708.84 million +1.7%N/A7.8 $59.07
10/15/202311,800,000 shares $711.54 million -2.6%N/A8.1 $60.30
9/30/202312,110,000 shares $719.94 million -10.4%N/A8.4 $59.45
9/15/202313,520,000 shares $849.73 million +11.6%N/A9.6 $62.85
8/31/202312,120,000 shares $770.10 million -4.4%N/A9 $63.54
8/15/202312,680,000 shares $756.11 million +0.3%N/A8.6 $59.63
7/31/202312,640,000 shares $776.10 million +1.9%N/A8.7 $61.40
7/15/202312,410,000 shares $738.52 million +5.6%N/A9 $59.51
6/30/202311,750,000 shares $667.52 million -15.4%N/A8.6 $56.81
6/15/202313,890,000 shares $794.09 million +12.2%N/A10.5 $57.17
5/31/202312,380,000 shares $660.78 million -2.0%N/A9.3 $53.38
5/15/202312,630,000 shares $702.99 million +0.1%N/A9.6 $55.66
4/30/202312,620,000 shares $697.13 million -9.1%N/A9.4 $55.24
4/15/202313,890,000 shares $732.84 million +3.6%4.8%9.4 $52.76
3/31/202313,410,000 shares $709.52 million -13.0%4.7%9 $52.91
3/15/202315,410,000 shares $802.40 million +7.7%5.4%10.4 $52.07
2/28/202314,310,000 shares $754.85 million +0.4%5.0%9.7 $52.75
2/15/202314,260,000 shares $759.49 million -6.0%5.0%9.8 $53.26
1/31/202315,170,000 shares $827.98 million -5.0%5.3%10.8 $54.58
1/15/202315,960,000 shares $839.97 million -0.3%5.5%12.3 $52.63
12/30/202216,000,000 shares $797.60 million -15.5%5.6%12.2 $49.85
12/15/202218,930,000 shares $1.03 billion +10.1%6.6%13.5 $54.32
11/30/202217,190,000 shares $933.93 million -1.3%6.0%10.8 $54.33
11/15/202217,410,000 shares $915.42 million -9.0%6.0%10.7 $52.58
10/31/202219,130,000 shares $957.84 million +1.1%6.6%12 $50.07
10/15/202218,920,000 shares $835.13 million +2.1%6.6%10.9 $44.14
9/30/202218,530,000 shares $814.76 million +0.8%6.4%10 $43.97
9/15/202218,390,000 shares $983.87 million +7.2%6.4%10.2 $53.50
8/31/202217,160,000 shares $902.79 million -0.1%6.0%10.5 $52.61
8/15/202217,170,000 shares $936.28 million +0.8%6.0%10.7 $54.53
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7/31/202217,040,000 shares $826.27 million -3.3%5.9%9.7 $48.49
7/15/202217,620,000 shares $790.08 million +5.5%6.1%10.4 $44.84
6/30/202216,700,000 shares $813.12 million -5.5%5.8%10.7 $48.69
6/15/202217,670,000 shares $847.63 million -3.9%6.1%10.6 $47.97
5/31/202218,380,000 shares $990.68 million -5.7%6.4%10.8 $53.90
5/15/202219,490,000 shares $1.02 billion -3.8%6.8%10.2 $52.33
4/30/202220,250,000 shares $1.09 billion -1.8%7.0%10.8 $53.73
4/15/202220,620,000 shares $1.14 billion -3.2%7.2%10 $55.42
3/31/202221,310,000 shares $1.18 billion -0.1%7.4%9.1 $55.41
3/15/202221,330,000 shares $1.04 billion -1.3%7.4%9 $48.68
2/28/202221,610,000 shares $1.06 billion -1.5%7.5%9.2 $49.18
2/15/202221,930,000 shares $959.44 million -5.6%7.6%9.7 $43.75
1/31/202223,230,000 shares $1.07 billion -7.3%8.1%10.7 $45.92
1/15/202225,060,000 shares $1.12 billion -4.6%8.7%12.5 $44.77
12/31/202126,260,000 shares $1.37 billion -7.7%9.2%14.4 $52.33
12/15/202128,440,000 shares $1.41 billion -3.5%9.9%17.2 $49.53
11/30/202129,480,000 shares $1.34 billion -1.6%10.3%19.4 $45.44
11/15/202129,950,000 shares $1.47 billion +4.1%10.5%19.7 $48.96
10/29/202128,770,000 shares $1.31 billion -0.9%10.0%19.4 $45.64
10/15/202129,040,000 shares $1.30 billion +0.4%10.1%20.6 $44.88
9/30/202128,940,000 shares $1.26 billion -1.2%10.1%19.6 $43.45
9/15/202129,290,000 shares $1.32 billion +5.6%10.2%18.2 $45.07
8/31/202127,740,000 shares $1.32 billion -1.9%9.7%16.2 $47.75
8/13/202128,270,000 shares $1.30 billion -1.8%9.9%15.2 $46.10
7/30/202128,790,000 shares $1.26 billion +0.7%10.1%13.6 $43.76
7/15/202128,590,000 shares $1.26 billion -5.6%10.0%12.9 $44.05
6/30/202130,280,000 shares $1.28 billion -12.4%10.6%12.9 $42.32
6/15/202134,570,000 shares $1.59 billion +3.6%12.1%15.6 $45.96
5/28/202133,380,000 shares $1.45 billion -4.8%11.7%15 $43.54

IRM Short Interest - Frequently Asked Questions

Short interest is the volume of Iron Mountain shares that have been sold short but have not yet been covered or closed out. As of April 30th, traders have sold 7,641,375 shares of IRM short. 2.61% of Iron Mountain's shares are currently sold short. Learn More on Iron Mountain'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. IRM shares currently have a short interest ratio of 3.9. Learn More on Iron Mountain's short interest ratio.

As of the most recent reporting period, the following institutional investors, funds, and major shareholders have reported short positions of Iron Mountain: PEAK6 LLC, Tudor Investment Corp ET AL, Millennium Management LLC, and Caption Management LLC. These positions are disclosed in Form 13F filings with the Securities and Exchange Commission.

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. 2.61% of Iron Mountain's floating shares are currently sold short.

Iron Mountain saw a drop in short interest in April. As of April 30th, there was short interest totaling 7,641,375 shares, a drop of 4.7% from the previous total of 8,021,715 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.

2.61% of Iron Mountain's shares are currently sold short. Here is how the short interest of companies compare to Iron Mountain: Equinix, Inc. (1.85%), Lamar Advertising Company (4.90%), Digital Realty Trust, Inc. (2.25%), Kimco Realty Corporation (3.55%), Stag Industrial, Inc. (3.68%), Cintas Corporation (3.32%), Copart, Inc. (3.76%), UniFirst Corporation (2.93%), McGrath RentCorp (1.31%), Healthcare Services Group, Inc. (3.59%),

As of the most recent reporting period, the following stocks had the largest short interest positions: SPDR S&P 500 ETF Trust ($86.09 billion), Invesco QQQ ($39.89 billion), iShares Russell 2000 ETF ($26.13 billion), Western Digital Corporation ($12.66 billion), Salesforce Inc. ($12.29 billion), Sandisk Corporation ($11.87 billion), SPDR S&P Biotech ETF ($9.82 billion), Lumentum Holdings Inc. ($8.51 billion), iShares 20+ Year Treasury Bond ETF ($7.76 billion), and Bloom Energy Corporation ($7.40 billion). View all of the most shorted stocks.

Short selling IRM is an investing strategy that aims to generate trading profit from Iron Mountain as its price is falling. IRM shares are trading down $0.42 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 Iron Mountain 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 IRM, 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 IRM, twice per month. The most recent reporting period available is April, 30 2026.

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

  • 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 (NYSE:IRM) was last updated on 5/20/2026 by MarketBeat.com Staff.
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