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Energy Recovery (ERII) Short Interest Ratio & Short Volume

Energy Recovery logo
$9.12 -0.31 (-3.23%)
As of 01:54 PM Eastern
This is a fair market value price provided by Massive. Learn more.
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Energy Recovery Short Interest Overview

As of April 15, 2026, Energy Recovery (ERII) had a short interest of 2.07 million shares sold short, representing 4.04% of the public float. This marks a -2.55% decrease in short interest since the prior report. The short interest ratio (days to cover) is 3.0, meaning it would take 3.0 days of the average trading volume of 722,288 shares to cover all short positions.

Current Short Interest
2,068,080 shares
Previous Short Interest
2,122,090 shares
Change Vs. Previous Month
-2.55%
Dollar Volume Sold Short
$21.96 million
Short Interest Ratio
3.0 Days to Cover
Last Record Date
April 15, 2026
Outstanding Shares
52,002,000 shares
Short Percent of Float
4.04%
Today's Trading Volume
669,745 shares
Average Trading Volume
722,288 shares
Today's Volume Vs. Average
93%
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Short Interest ChartDays to Cover ChartShort Percent of Float Chart

ERII Short Interest Over Time

ERII Days to Cover Over Time

ERII Percentage of Float Shorted Over Time

Energy Recovery 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
4/15/20262,068,080 shares $21.96 million -2.6%4.0%2.96 $10.62
3/31/20262,122,090 shares $21.37 million +35.8%4.1%2.39 $10.07
3/13/20261,562,859 shares $15.71 million +8.2%3.1%1.52 $10.05
2/27/20261,444,444 shares $15.07 million -5.0%2.8%1.7 $10.43
2/13/20261,520,567 shares $23.72 million -2.4%3.0%5.42 $15.60
1/30/20261,557,101 shares $22.72 million +9.5%3.0%4.84 $14.59
1/15/20261,422,583 shares $20.34 million -1.4%2.8%4.7 $14.30
12/31/20251,442,894 shares $19.46 million -11.7%2.8%2.95 $13.49
12/15/20251,634,522 shares $23.73 million -1.4%3.2%4.03 $14.52
11/28/20251,657,557 shares $23.96 million +32.9%3.2%3.11 $14.46
11/14/20251,247,644 shares $18.15 million -17.4%2.4%1.45 $14.55
10/31/20251,510,736 shares $25.85 million +11.1%2.9%3.96 $17.11
10/15/20251,360,000 shares $22.22 million +7.9%2.7%3.1 $16.34
9/30/20251,260,000 shares $19.43 million +0.8%2.5%3 $15.42
9/15/20251,250,000 shares $18.19 million +10.6%2.4%2.9 $14.55
8/31/20251,130,000 shares $16.06 million +5.6%2.2%2.7 $14.21
8/15/20251,070,000 shares $15.17 million +11.0%2.1%2.5 $14.18
7/31/2025963,700 shares $12.96 million +20.1%1.9%1.9 $13.45
7/15/2025802,600 shares $10.43 million -14.3%1.5%1.6 $13.00
6/30/2025936,300 shares $11.97 million -5.5%1.8%1.9 $12.78
6/15/2025990,900 shares $12.25 million +2.0%1.9%2 $12.36
5/31/2025971,500 shares $12.24 million +3.6%1.9%1.9 $12.60
5/15/2025938,100 shares $11.52 million +0.8%1.8%1.8 $12.28
4/30/2025930,600 shares $14.38 million -16.2%1.8%2.1 $15.45
4/15/20251,110,000 shares $16.74 million -12.6%2.1%2.9 $15.08
3/31/20251,270,000 shares $20.18 million +0.8%2.4%3.5 $15.89
3/15/20251,260,000 shares $20.64 million +8.6%2.4%3.6 $16.38
2/28/20251,160,000 shares $17.35 million -12.8%2.2%3.6 $14.96
2/15/20251,330,000 shares $20.34 million -10.7%2.4%3.6 $15.29
1/31/20251,490,000 shares $21.37 million -10.2%2.7%3.4 $14.34
1/15/20251,660,000 shares $23.85 million +2.5%3.0%3.7 $14.37
12/31/20241,620,000 shares $23.81 million -5.8%2.9%3.4 $14.70
12/15/20241,720,000 shares $27.71 million +13.2%3.1%3.7 $16.11
11/30/20241,520,000 shares $23.65 million -20.8%2.7%3.3 $15.56
11/15/20241,920,000 shares $36 million -12.7%3.4%4.2 $18.75
10/31/20242,200,000 shares $39.29 million -3.5%3.9%6.3 $17.86
10/15/20242,280,000 shares $41.13 million -0.9%4.1%6 $18.04
9/30/20242,300,000 shares $40.00 million +8.5%4.1%6 $17.39
9/15/20242,120,000 shares $33.98 million -4.5%3.8%5.3 $16.03
8/31/20242,220,000 shares $36.05 million -10.5%4.0%5.5 $16.24
8/15/20242,480,000 shares $42.63 million -6.4%4.4%6.2 $17.19
7/31/20242,650,000 shares $38.64 million +2.3%4.8%6.6 $14.58
7/15/20242,590,000 shares $38.23 million +2.4%4.7%6.6 $14.76
6/30/20242,530,000 shares $33.62 million +6.8%4.6%6.6 $13.29
6/15/20242,370,000 shares $30.41 million -9.9%4.3%6.3 $12.83
5/31/20242,630,000 shares $35.51 million -3.7%4.7%6.5 $13.50
5/15/20242,730,000 shares $38.47 million +9.6%4.9%6.4 $14.09
4/30/20242,490,000 shares $37.10 million +5.1%4.5%5.6 $14.90
4/15/20242,370,000 shares $33.13 million -5.6%4.3%5.4 $13.98
3/31/20242,510,000 shares $39.63 million -2.7%4.6%5.2 $15.79
3/15/20242,580,000 shares $38.24 million -15.1%4.7%5.5 $14.82
2/29/20243,040,000 shares $47.52 million -12.4%5.5%6.7 $15.63
2/15/20243,470,000 shares $56.32 million -3.6%6.3%8.1 $16.23
1/31/20243,600,000 shares $55.84 million +0.3%6.6%8.4 $15.51
1/15/20243,590,000 shares $64.30 million +1.7%6.5%6.9 $17.91
12/31/20233,530,000 shares $66.51 million -0.3%6.4%7.2 $18.84
12/15/20233,540,000 shares $65.74 million -2.5%6.5%6.9 $18.57
11/30/20233,630,000 shares $69.19 million +1.4%6.6%6.9 $19.06
11/15/20233,580,000 shares $69.63 million +4.4%6.5%6.7 $19.45
10/31/20233,430,000 shares $52.14 million +12.1%6.2%6.6 $15.20
10/15/20233,060,000 shares $59.70 million No Change5.6%6.8 $19.51
9/30/20233,060,000 shares $64.90 million +3.4%5.6%7 $21.21
9/15/20232,960,000 shares $68.08 million +9.6%5.4%6.9 $23.00
8/31/20232,700,000 shares $73.39 million -1.1%4.9%6.4 $27.18
8/15/20232,730,000 shares $74.75 million +25.8%5.0%6.7 $27.38
7/31/20232,170,000 shares $66.14 million +0.9%4.0%5.3 $30.48
7/15/20232,150,000 shares $62.50 million -4.4%3.9%5.5 $29.07
6/30/20232,250,000 shares $62.89 million -1.8%4.1%6 $27.95
6/15/20232,290,000 shares $61.44 million -4.6%4.4%6.5 $26.83
5/31/20232,400,000 shares $57.14 million -1.2%4.6%6.8 $23.81
5/15/20232,430,000 shares $59.71 million -0.8%4.7%6.5 $24.57
4/30/20232,450,000 shares $55.20 million +2.9%4.9%6.5 $22.53
4/15/20232,380,000 shares $58.33 million +13.9%4.7%7 $24.51
3/31/20232,090,000 shares $48.17 million -9.9%4.1%6.4 $23.05
3/15/20232,320,000 shares $50.97 million -5.7%4.6%7.6 $21.97
2/28/20232,460,000 shares $54.29 million +5.1%4.9%8.2 $22.07
2/15/20232,340,000 shares $52.65 million -0.9%4.7%7.7 $22.50
1/31/20232,360,000 shares $52.23 million -4.1%4.7%7.3 $22.13
1/15/20232,460,000 shares $54.59 million -6.1%4.9%6 $22.19
12/30/20222,620,000 shares $53.68 million +3.6%5.2%6 $20.49
12/15/20222,530,000 shares $53.59 million -4.5%5.0%5.4 $21.18
11/30/20222,650,000 shares $61.43 million -8.3%5.3%5.1 $23.18
11/15/20222,890,000 shares $62.08 million -5.3%5.8%5.6 $21.48
10/31/20223,050,000 shares $78.48 million +21.0%6.1%6.4 $25.73
10/15/20222,520,000 shares $51.69 million -14.6%5.1%6.3 $20.51
9/30/20222,950,000 shares $64.13 million +1.4%6.5%8.4 $21.74
9/15/20222,910,000 shares $73.94 million +5.4%6.4%8.5 $25.41
8/31/20222,760,000 shares $63.31 million +1.5%6.1%8.6 $22.94
8/15/20222,720,000 shares $65.52 million +6.3%6.0%8.3 $24.09
7/31/20222,560,000 shares $56.91 million -6.2%5.5%6.7 $22.23
7/15/20222,730,000 shares $52.77 million +5.4%5.9%6.9 $19.33
6/30/20222,590,000 shares $50.30 million +11.6%5.6%5.9 $19.42
6/15/20222,320,000 shares $45.17 million +1.8%5.0%5 $19.47
5/31/20222,280,000 shares $46.08 million -10.2%4.9%5 $20.21
5/15/20222,540,000 shares $44.22 million +2.8%5.5%5.9 $17.41
4/30/20222,470,000 shares $45.74 million +3.4%5.3%6.4 $18.52
4/15/20222,390,000 shares $48.56 million +8.6%5.1%6.5 $20.32
3/31/20222,200,000 shares $44.31 million +6.3%4.8%6.1 $20.14
3/15/20222,070,000 shares $39.19 million +3.0%4.5%6.5 $18.93
2/28/20222,010,000 shares $38.19 million -2.0%4.3%6.4 $19.00
2/15/20222,050,000 shares $40.34 million -8.1%4.4%7.1 $19.68
1/31/20222,230,000 shares $43.66 million +12.1%4.8%6.7 $19.58
1/15/20221,990,000 shares $39.24 million -0.5%4.3%5.5 $19.72
12/31/20212,000,000 shares $42.98 million -1.5%4.3%5 $21.49
12/15/20212,030,000 shares $41.96 million +1.5%4.4%5.1 $20.67
11/30/20212,000,000 shares $42.50 million -14.9%4.2%5.2 $21.25
11/15/20212,350,000 shares $51.94 million -3.3%5.1%5.7 $22.10
10/29/20212,430,000 shares $49.38 million -5.8%5.3%6.4 $20.32
10/15/20212,580,000 shares $51.45 million -2.6%6.5%7.4 $19.94
9/30/20212,650,000 shares $50.43 million -2.9%6.7%8.9 $19.03
9/15/20212,730,000 shares $55.88 million +8.8%6.9%8.1 $20.47
8/31/20212,510,000 shares $51.28 million +4.6%6.6%6.9 $20.43
8/13/20212,400,000 shares $45.79 million -2.0%6.3%6.5 $19.08
7/30/20212,450,000 shares $51.82 million -5.4%6.4%5.7 $21.15
7/15/20212,590,000 shares $53.38 million +9.8%6.8%5.4 $20.61
6/30/20212,360,000 shares $53.76 million -5.6%6.2%4.4 $22.78
6/15/20212,500,000 shares $53.30 million +11.6%6.6%5.2 $21.32
5/28/20212,240,000 shares $42.58 million -8.2%5.9%4.4 $19.01
5/14/20212,440,000 shares $41.50 million +4.7%6.4%4.3 $17.01

ERII Short Interest - Frequently Asked Questions

Short interest is the volume of Energy Recovery shares that have been sold short but have not yet been closed out or covered. As of April 15th, investors have sold 2,068,080 shares of ERII short. 4.04% of Energy Recovery's shares are currently sold short. Learn More on Energy Recovery'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. ERII shares currently have a short interest ratio of 3.0. Learn More on Energy Recovery'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. 4.04% of Energy Recovery's floating shares are currently sold short.

Energy Recovery saw a drop in short interest during the month of April. As of April 15th, there was short interest totaling 2,068,080 shares, a drop of 2.5% from the previous total of 2,122,090 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.

4.04% of Energy Recovery's shares are currently sold short. Here is how the short interest of companies in the industry of "industrial machinery" compare to Energy Recovery: Gorman-Rupp Company (The) (1.06%), Albany International Corporation (1.81%), Proto Labs, Inc. (2.77%), Tennant Company (5.59%), TriMas Corporation (7.88%), Graham Corporation (2.88%), Hyster-Yale, Inc. (3.16%), Columbus McKinnon Corporation (1.70%), L.B. Foster Company (1.11%), Omega Flex, Inc. (1.79%),

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.

Short selling ERII is an investing strategy that aims to generate trading profit from Energy Recovery as its price is falling. ERII shares are trading down $0.31 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 Energy Recovery 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 ERII, 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 ERII, twice per month. The most recent reporting period available is April, 15 2026.

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

  • 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:ERII) was last updated on 5/8/2026 by MarketBeat.com Staff.
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