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Stock research / United States / ERII / Short interest

Energy Recovery, Inc. short interest

3.2M shares of Energy Recovery were sold short at the 15 October 2026 settlement, near the top of its range over the last year (1.2M to 3.4M). Short sellers would need 4.3 days of normal trading to buy them back.

Shares sold short3.2Mat 15 Oct 2026
Change on the settlement before-3.6%+135% over a year
Days to cover4.28at 748K shares a day
Of shares in issue6.26%shares short over shares outstanding
New to this? How to read this page
  1. Short interest is the number of shares investors have borrowed and sold, betting the price will fall, and not yet bought back.
  2. Days to cover is shares short over an average day's trading: how many days it would take short sellers to buy them all back. Above 5 or so is high.
  3. Rising short interest says more investors are betting against the stock. A crowded short can also rise fast if shorts rush to buy back.
  4. Brokers report it twice a month to FINRA, about ten days after each settlement date.
  5. What is short interest?

Short interest, days to cover and the price

Short interest is near the top of its range over the last year (1.2M to 3.4M), and the share price moved -57% over the last year.

Shares sold shortDays to coverShare price

Three charts on one timeline. Top: shares sold short at each settlement. Middle: days to cover, taller meaning shorts would need longer to buy back. Bottom: the share price, so you can see whether shorts added as the price fell or rose.

How it compares

every company on the site

    The bar ranks every company on the site from the lowest on the left to the highest on the right, in three equal thirds; the small figures under it are the values where each third starts, and the black tick is the middle company. The orange dot is this company; the grey ticks are the other companies in its industry (hover or tap for names). A hatched block is companies tied at none.

    Every settlement since 29 Dec 2017 as a table
    SettlementShares shortChangeAverage daily volumeDays to cover
    15 October 20263.2M-3.6%748K4.28
    30 September 20263.3M-3.2%898K3.70
    15 September 20263.4M+2.0%1.1M3.21
    31 August 20263.4M-2.3%1.0M3.33
    14 August 20263.4M+24.1%1.1M3.21
    31 July 20262.8M+2.3%779K3.56
    15 July 20262.7M+5.7%676K4.01
    30 June 20262.6M+12.4%1.4M1.78
    15 June 20262.3M+10.3%869K2.63
    29 May 20262.1M+8.9%815K2.54
    15 May 20261.9M+9.9%1.8M1.03
    30 April 20261.7M-16.4%1.0M1.71
    15 April 20262.1M-2.5%699K2.96
    31 March 20262.1M+35.8%888K2.39
    13 March 20261.6M+8.2%1.0M1.52
    27 February 20261.4M-5.0%848K1.70
    13 February 20261.5M-2.3%280K5.42
    30 January 20261.6M+9.5%322K4.84
    15 January 20261.4M-1.4%303K4.70
    31 December 20251.4M-11.7%489K2.95
    15 December 20251.6M-1.4%405K4.03
    28 November 20251.7M+32.9%533K3.11
    14 November 20251.2M-17.4%863K1.45
    31 October 20251.5M+11.1%381K3.96
    15 October 20251.4M+7.7%384K3.54
    30 September 20251.3M+0.7%527K2.39
    15 September 20251.3M+10.6%411K3.05
    29 August 20251.1M+5.7%319K3.55
    15 August 20251.1M+11.3%482K2.22
    31 July 2025964K+20.1%404K2.39
    15 July 2025803K-14.3%356K2.26
    30 June 2025936K-5.5%503K1.86
    13 June 2025991K+2.0%365K2.72
    30 May 2025972K+3.6%500K1.94
    15 May 2025938K+0.8%752K1.25
    30 April 2025931K-15.8%439K2.12
    15 April 20251.1M-13.2%463K2.39
    31 March 20251.3M+0.8%457K2.78
    14 March 20251.3M+9.2%459K2.75
    28 February 20251.2M-12.9%338K3.43
    14 February 20251.3M-11.1%221K6.01
    31 January 20251.5M-10.0%281K5.32
    15 January 20251.7M+2.2%261K6.35
    31 December 20241.6M-5.6%377K4.31
    13 December 20241.7M+12.9%387K4.44
    29 November 20241.5M-20.8%1.1M1.35
    15 November 20241.9M-12.4%383K5.03
    31 October 20242.2M-3.7%357K6.16
    15 October 20242.3M-0.9%302K7.56
    30 September 20242.3M+8.9%317K7.27
    13 September 20242.1M-4.6%355K5.96
    30 August 20242.2M-10.7%351K6.32
    15 August 20242.5M-6.2%580K4.28
    31 July 20242.6M+2.3%326K8.12
    15 July 20242.6M+2.1%342K7.56
    28 June 20242.5M+6.8%382K6.63
    14 June 20242.4M-9.7%434K5.47
    31 May 20242.6M-3.5%280K9.38
    15 May 20242.7M+9.5%548K4.97
    30 April 20242.5M+4.9%327K7.61
    15 April 20242.4M-5.6%346K6.87
    28 March 20242.5M-2.6%328K7.67
    15 March 20242.6M-15.3%527K4.90
    29 February 20243.0M-12.2%628K4.85
    15 February 20243.5M-3.7%402K8.63
    31 January 20243.6M+0.3%543K6.62
    12 January 20243.6M+1.6%431K8.32
    29 December 20233.5M-0.2%237K14.90
    15 December 20233.5M-2.6%422K8.38
    30 November 20233.6M+1.5%353K10.29
    15 November 20233.6M+4.5%678K5.28
    31 October 20233.4M+12.0%790K4.34
    13 October 20233.1M-0.0%418K7.31
    29 September 20233.1M+3.5%471K6.50
    15 September 20233.0M+9.6%467K6.33
    31 August 20232.7M-1.4%277K9.75
    15 August 20232.7M+26.3%630K4.34
    31 July 20232.2M+0.7%391K5.54
    14 July 20232.1M-4.5%296K7.26
    30 June 20232.3M-1.8%510K4.41
    15 June 20232.3M-4.6%343K6.68
    31 May 20232.4M-1.2%283K8.49
    15 May 20232.4M-0.7%403K6.03
    28 April 20232.4M+2.7%378K6.48
    14 April 20232.4M+14.2%404K5.90
    31 March 20232.1M-10.2%309K6.74
    15 March 20232.3M-5.5%363K6.39
    28 February 20232.5M+5.0%455K5.40
    15 February 20232.3M-0.8%278K8.43
    31 January 20232.4M-3.9%220K10.72
    13 January 20232.5M-6.1%284K8.66
    30 December 20222.6M+3.6%283K9.24
    15 December 20222.5M-4.6%305K8.29
    30 November 20222.6M-8.3%338K7.83
    15 November 20222.9M-5.2%811K3.56
    31 October 20223.0M+21.0%508K6.01
    14 October 20222.5M-14.6%484K5.20
    30 September 20223.0M+1.5%490K6.03
    15 September 20222.9M+5.4%508K5.73
    31 August 20222.8M+1.5%226K12.22
    15 August 20222.7M+6.2%264K10.28
    29 July 20222.6M-6.4%205K12.49
    15 July 20222.7M+5.7%237K11.53
    30 June 20222.6M+11.4%534K4.84
    15 June 20222.3M+1.8%349K6.65
    31 May 20222.3M-10.2%512K4.46
    13 May 20222.5M+2.6%493K5.16
    29 April 20222.5M+3.7%386K6.41
    14 April 20222.4M+8.3%516K4.63
    31 March 20222.2M+6.7%424K5.20
    15 March 20222.1M+2.7%391K5.28
    28 February 20222.0M-1.9%271K7.42
    15 February 20222.1M-8.0%208K9.87
    31 January 20222.2M+12.1%358K6.22
    14 January 20222.0M-0.7%315K6.31
    31 December 20212.0M-1.6%340K5.88
    15 December 20212.0M+1.5%252K8.07
    30 November 20212.0M-14.6%434K4.61
    15 November 20212.3M-3.6%486K4.83
    29 October 20212.4M-5.8%579K4.20
    15 October 20212.6M-2.5%249K10.38
    30 September 20212.6M-2.9%369K7.17
    15 September 20212.7M+8.5%429K6.35
    31 August 20212.5M+4.5%212K11.86
    13 August 20212.4M-2.1%322K7.47
    30 July 20212.5M-5.1%208K11.82
    15 July 20212.6M+9.5%450K5.75
    30 June 20212.4M-5.4%512K4.62
    15 June 20212.5M+11.5%466K5.36
    28 May 20212.2M-8.4%370K6.04
    14 May 20212.4M+5.0%707K3.45
    30 April 20212.3M+20.6%629K3.70
    15 April 20211.9M-1.6%212K9.11
    31 March 20212.0M-9.3%467K4.20
    15 March 20212.2M+2.6%520K4.16
    26 February 20212.1M-4.2%546K3.86
    12 February 20212.2M-7.4%151K14.60
    29 January 20212.4M-5.7%166K14.31
    15 January 20212.5M-12.1%310K8.11
    31 December 20202.9M+1.1%265K10.80
    15 December 20202.8M-0.0%223K12.69
    30 November 20202.8M-0.1%180K15.71
    13 November 20202.8M-2.1%185K15.34
    30 October 20202.9M+7.3%184K15.78
    15 October 20202.7M-2.7%148K18.21
    30 September 20202.8M-13.3%264K10.50
    15 September 20203.2M-13.1%212K15.09
    31 August 20203.7M-1.4%151K24.33
    14 August 20203.7M-2.8%153K24.32
    31 July 20203.8M-8.1%148K25.91
    15 July 20204.2M+5.4%362K11.54
    30 June 20204.0M+4.7%271K14.60
    15 June 20203.8M+4.2%178K21.23
    29 May 20203.6M-10.5%219K16.60
    15 May 20204.1M+3.5%285K14.25
    30 April 20203.9M-7.1%197K19.88
    15 April 20204.2M+0.0%270K15.61
    31 March 20204.2M-7.8%346K12.21
    13 March 20204.6M+5.3%332K13.79
    28 February 20204.3M+3.6%202K21.56
    14 February 20204.2M-4.2%137K30.65
    31 January 20204.4M-2.4%136K32.28
    15 January 20204.5M-9.8%127K35.32
    31 December 20195.0M+10.6%194K25.66
    13 December 20194.5M-0.2%162K27.80
    29 November 20194.5M-8.8%233K19.33
    15 November 20194.9M+11.1%338K14.61
    31 October 20194.4M-7.5%187K23.82
    15 October 20194.8M-0.8%150K32.08
    30 September 20194.8M-10.9%147K32.85
    13 September 20195.4M+4.5%252K21.59
    30 August 20195.2M-5.9%304K17.13
    15 August 20195.5M+5.8%314K17.61
    31 July 20195.2M-6.7%233K22.45
    15 July 20195.6M+0.1%140K39.94
    28 June 20195.6M+4.1%203K27.55
    14 June 20195.4M+0.8%149K36.05
    31 May 20195.3M-4.2%205K26.02
    15 May 20195.6M+0.3%310K17.94
    30 April 20195.6M-7.2%112K49.45
    15 April 20196.0M-9.3%157K38.10
    29 March 20196.6M+2.2%195K33.83
    15 March 20196.5M-11.3%469K13.77
    28 February 20197.3M+6.6%113K64.71
    15 February 20196.8M-2.7%151K45.12
    31 January 20197.0M-7.2%178K39.36
    15 January 20197.6M-1.9%157K48.12
    31 December 20187.7M-0.9%390K19.79
    14 December 20187.8M-0.9%266K29.31
    30 November 20187.9M-3.4%146K53.90
    15 November 20188.1M-3.6%310K26.24
    31 October 20188.4M-0.3%253K33.27
    15 October 20188.5M+1.3%257K32.93
    28 September 20188.4M-4.0%235K35.55
    14 September 20188.7M-2.1%200K43.42
    31 August 20188.9M-5.6%284K31.31
    15 August 20189.4M-5.4%613K15.36
    31 July 201810.0M-2.8%220K45.18
    13 July 201810.2M-1.5%237K43.25
    29 June 201810.4M+0.6%256K40.69
    15 June 201810.3M+5.6%430K24.03
    31 May 20189.8M+1.2%342K28.60
    15 May 20189.7M+0.8%377K25.69
    30 April 20189.6M+1.9%308K31.12
    13 April 20189.4M+0.1%273K34.47
    29 March 20189.4M+2.1%452K20.82
    15 March 20189.2M-0.3%581K15.86
    28 February 20189.3M-0.5%501K18.46
    15 February 20189.3M+4.3%404K23.03
    31 January 20188.9M+5.6%345K25.86
    12 January 20188.4M+1.7%292K28.93
    29 December 20178.3M641K12.96
    Shares in millions (M) or thousands (K); hold the pointer on a figure for the exact count. FINRA publishes consolidated short interest twice a month, about ten days after each settlement.