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Aclaris Therapeutics, Inc. short interest

15.0M shares of Aclaris Therapeutics were sold short at the 15 October 2026 settlement, near the top of its range over the last year (3.8M to 18.2M). Short sellers would need 3.0 days of normal trading to buy them back.

Shares sold short15.0Mat 15 Oct 2026
Change on the settlement before-17.4%+220% over a year
Days to cover2.95at 5.1M shares a day
Of shares in issue10.75%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 (3.8M to 18.2M), and the share price moved +107% 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

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    Every settlement since 29 Dec 2017 as a table
    SettlementShares shortChangeAverage daily volumeDays to cover
    15 October 202615.0M-17.4%5.1M2.95
    30 September 202618.2M+13.2%2.8M6.48
    15 September 202616.1M+5.9%2.5M6.38
    31 August 202615.2M+3.2%1.8M8.67
    14 August 202614.7M+6.8%2.1M7.01
    31 July 202613.8M+3.1%1.6M8.66
    15 July 202613.4M+17.1%1.9M6.92
    30 June 202611.4M+28.2%2.7M4.27
    15 June 20268.9M+10.2%1.3M6.78
    29 May 20268.1M+9.9%916K8.82
    15 May 20267.3M-6.9%1.3M5.62
    30 April 20267.9M+11.5%1.5M5.31
    15 April 20267.1M+0.8%1.3M5.44
    31 March 20267.0M+49.4%1.9M3.73
    13 March 20264.7M-1.3%3.8M1.25
    27 February 20264.8M-2.4%1.2M3.86
    13 February 20264.9M-2.3%960K5.08
    30 January 20265.0M-3.2%5.3M1.00
    15 January 20265.2M+18.7%1.0M4.97
    31 December 20254.3M+14.9%942K4.62
    15 December 20253.8M-6.3%1.4M2.66
    28 November 20254.0M+3.5%994K4.06
    14 November 20253.9M-7.9%1.7M2.32
    31 October 20254.2M-9.7%1.4M2.92
    15 October 20254.7M-15.5%1.0M4.52
    30 September 20255.6M-4.7%1.0M5.33
    15 September 20255.8M-1.6%1.1M5.19
    29 August 20255.9M-1.1%599K9.88
    15 August 20256.0M-8.7%868K6.90
    31 July 20256.6M-15.7%1.8M3.69
    15 July 20257.8M+3.9%692K11.24
    30 June 20257.5M+54.6%1.9M3.87
    13 June 20254.8M+3.0%688K7.04
    30 May 20254.7M+2.9%793K5.93
    15 May 20254.6M+2.8%579K7.89
    30 April 20254.4M+9.3%831K5.35
    15 April 20254.1M-34.8%956K4.26
    31 March 20256.2M+3.6%1.2M5.39
    14 March 20256.0M+26.5%1.1M5.58
    28 February 20254.8M-5.1%565K8.44
    14 February 20255.0M+28.3%589K8.53
    31 January 20253.9M+15.7%769K5.09
    15 January 20253.4M-5.0%1.2M2.93
    31 December 20243.6M+12.6%992K3.59
    13 December 20243.2M+27.5%855K3.70
    29 November 20242.5M+59.1%11.5M1.00
    15 November 20241.6M-35.3%1.1M1.38
    31 October 20242.4M+73.2%1.1M2.16
    15 October 20241.4M-19.5%198K7.01
    30 September 20241.7M+1.0%320K5.39
    13 September 20241.7M-0.4%224K7.65
    30 August 20241.7M-4.4%218K7.86
    15 August 20241.8M-3.4%640K2.81
    31 July 20241.9M-13.9%977K1.90
    15 July 20242.2M-45.2%834K2.59
    28 June 20243.9M-11.6%1.6M2.40
    14 June 20244.5M-3.3%564K7.91
    31 May 20244.6M-5.3%568K8.12
    15 May 20244.9M-18.2%714K6.82
    30 April 20245.9M+19.1%790K7.53
    15 April 20245.0M+2.1%667K7.49
    28 March 20244.9M-4.5%761K6.43
    15 March 20245.1M-16.0%1.3M3.98
    29 February 20246.1M+4.5%1.6M3.84
    15 February 20245.8M-7.8%1.4M4.28
    31 January 20246.3M-0.4%1.9M3.34
    12 January 20246.4M+9.8%3.5M1.80
    29 December 20235.8M-2.2%2.5M2.35
    15 December 20235.9M+24.1%3.3M1.77
    30 November 20234.8M-35.5%6.3M1.00
    15 November 20237.4M+12.4%12.2M1.00
    31 October 20236.6M+8.8%1.4M4.78
    13 October 20236.0M+2.0%771K7.84
    29 September 20235.9M-9.0%1.1M5.49
    15 September 20236.5M+14.3%1.0M6.33
    31 August 20235.7M+10.4%879K6.48
    15 August 20235.2M-0.8%531K9.73
    31 July 20235.2M+4.1%422K12.35
    14 July 20235.0M-5.2%442K11.31
    30 June 20235.3M+13.8%934K5.65
    15 June 20234.6M-2.6%730K6.35
    31 May 20234.8M+2.4%499K9.54
    15 May 20234.6M-5.4%610K7.62
    28 April 20234.9M-1.4%634K7.75
    14 April 20235.0M+3.8%558K8.93
    31 March 20234.8M+14.8%914K5.25
    15 March 20234.2M+26.6%2.6M1.59
    28 February 20233.3M+8.9%959K3.45
    15 February 20233.0M+14.4%1.1M2.64
    31 January 20232.7M-6.8%472K5.61
    13 January 20232.8M-5.0%282K10.09
    30 December 20223.0M+12.4%313K9.58
    15 December 20222.7M-3.7%357K7.45
    30 November 20222.8M-14.2%336K8.24
    15 November 20223.2M-12.4%360K8.96
    31 October 20223.7M-5.0%357K10.29
    14 October 20223.9M+7.2%247K15.68
    30 September 20223.6M+9.4%456K7.92
    15 September 20223.3M+5.2%300K11.00
    31 August 20223.1M-10.0%330K9.50
    15 August 20223.5M-1.6%378K9.22
    29 July 20223.5M-8.9%212K16.69
    15 July 20223.9M+3.1%258K15.06
    30 June 20223.8M+5.7%611K6.17
    15 June 20223.6M+1.4%352K10.15
    31 May 20223.5M+37.4%385K9.14
    13 May 20222.6M+20.1%431K5.95
    29 April 20222.1M-8.3%333K6.41
    14 April 20222.3M-16.3%885K2.63
    31 March 20222.8M+2.1%394K7.05
    15 March 20222.7M+3.3%395K6.89
    28 February 20222.6M+14.2%467K5.64
    15 February 20222.3M+10.9%550K4.19
    31 January 20222.1M+7.4%453K4.58
    14 January 20221.9M-5.7%568K3.41
    31 December 20212.1M+0.3%350K5.87
    15 December 20212.0M+8.9%412K4.96
    30 November 20211.9M-0.4%422K4.45
    15 November 20211.9M-15.5%448K4.21
    29 October 20212.2M-19.2%317K7.03
    15 October 20212.8M-14.1%376K7.36
    30 September 20213.2M+9.1%621K5.18
    15 September 20212.9M+8.0%506K5.83
    31 August 20212.7M-12.9%288K9.48
    13 August 20213.1M+0.8%353K8.88
    30 July 20213.1M-11.4%384K8.10
    15 July 20213.5M-13.2%542K6.47
    30 June 20214.0M+61.2%1.3M3.04
    15 June 20212.5M+32.5%1.2M2.18
    28 May 20211.9M-0.1%450K4.20
    14 May 20211.9M+10.1%505K3.75
    30 April 20211.7M+16.5%438K3.92
    15 April 20211.5M+62.1%630K2.34
    31 March 2021911K+41.5%629K1.45
    15 March 2021644K-15.2%386K1.67
    26 February 2021759K-47.7%843K1.00
    12 February 20211.5M+52.9%993K1.46
    29 January 2021950K+69.1%16.1M1.00
    15 January 2021562K-18.4%370K1.52
    31 December 2020688K+42.2%1.7M1.00
    15 December 2020484K-12.8%311K1.55
    30 November 2020555K-9.4%324K1.71
    13 November 2020613K-10.1%226K2.71
    30 October 2020682K+5.7%262K2.60
    15 October 2020645K-6.7%1.0M1.00
    30 September 2020692K+17.0%214K3.24
    15 September 2020591K-12.0%219K2.70
    31 August 2020672K-19.7%394K1.70
    14 August 2020837K-12.2%601K1.39
    31 July 2020953K-23.0%1.1M1.00
    15 July 20201.2M-9.6%583K2.12
    30 June 20201.4M-21.7%1.6M1.00
    15 June 20201.8M+0.4%387K4.53
    29 May 20201.7M-10.9%186K9.36
    15 May 20202.0M-7.1%178K10.97
    30 April 20202.1M-12.8%202K10.41
    15 April 20202.4M-37.7%253K9.55
    31 March 20203.9M-25.0%287K13.53
    13 March 20205.2M+21.2%346K14.98
    28 February 20204.3M+5.4%1.2M3.67
    14 February 20204.1M+18.6%576K7.03
    31 January 20203.4M+11.6%546K6.25
    15 January 20203.1M-16.7%1.3M2.33
    31 December 20193.7M-5.8%451K8.15
    13 December 20193.9M-21.2%364K10.71
    29 November 20195.0M-0.7%379K13.07
    15 November 20195.0M-17.3%668K7.47
    31 October 20196.0M+41.5%1.7M3.49
    15 October 20194.3M+61.9%1.7M2.46
    30 September 20192.6M-11.4%4.8M1.00
    13 September 20193.0M-3.9%628K4.72
    30 August 20193.1M+4.7%864K3.57
    15 August 20192.9M+39.8%2.0M1.44
    31 July 20192.1M+0.6%740K2.85
    15 July 20192.1M-28.6%778K2.69
    28 June 20192.9M-0.9%1.6M1.83
    14 June 20193.0M+2.5%356K8.31
    31 May 20192.9M+0.3%523K5.53
    15 May 20192.9M-4.6%664K4.34
    30 April 20193.0M-6.4%618K4.89
    15 April 20193.2M-1.5%372K8.68
    29 March 20193.3M-4.9%658K4.98
    15 March 20193.4M+2.4%608K5.67
    28 February 20193.4M+3.2%469K7.18
    15 February 20193.3M-1.0%414K7.88
    31 January 20193.3M+13.2%500K6.58
    15 January 20192.9M+0.2%430K6.76
    31 December 20182.9M+30.7%983K2.95
    14 December 20182.2M-5.2%612K3.63
    30 November 20182.3M-17.9%597K3.92
    15 November 20182.9M-10.8%462K6.18
    31 October 20183.2M-14.4%737K4.34
    15 October 20183.7M-7.2%265K14.10
    28 September 20184.0M-6.5%193K20.90
    14 September 20184.3M-0.8%173K24.86
    31 August 20184.3M-6.4%339K12.79
    15 August 20184.6M-8.2%234K19.81
    31 July 20185.1M-4.9%220K22.97
    13 July 20185.3M-1.2%202K26.34
    29 June 20185.4M+0.1%281K19.12
    15 June 20185.4M-0.3%324K16.62
    31 May 20185.4M-2.1%210K25.64
    15 May 20185.5M-0.5%206K26.71
    30 April 20185.5M+4.8%202K27.37
    13 April 20185.3M+5.4%235K22.43
    29 March 20185.0M-4.9%290K17.26
    15 March 20185.3M+11.0%353K14.90
    28 February 20184.7M+2.4%192K24.68
    15 February 20184.6M+37.8%461K10.06
    31 January 20183.4M+0.5%329K10.23
    12 January 20183.3M+0.7%302K11.07
    29 December 20173.3M334K9.95
    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.