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Costar Group, Inc. short interest

15.0M shares of Costar Group were sold short at the 15 October 2026 settlement, near the bottom of its range over the last year (13.3M to 26.2M). Short sellers would need 2.9 days of normal trading to buy them back.

Shares sold short15.0Mat 15 Oct 2026
Change on the settlement before+12.8%-5% over a year
Days to cover2.88at 5.2M shares a day
Of shares in issue3.73%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 bottom of its range over the last year (13.3M to 26.2M), and the share price moved -59% 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. Counts before a split are restated to today's shares, the way the price is.

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+12.8%5.2M2.88
    30 September 202613.3M-10.5%6.7M1.97
    15 September 202614.8M-21.5%5.5M2.68
    31 August 202618.9M+13.2%7.5M2.51
    14 August 202616.7M+2.3%6.0M2.79
    31 July 202616.3M-0.1%8.5M1.92
    15 July 202616.3M+6.9%6.7M2.45
    30 June 202615.3M-10.8%8.0M1.90
    15 June 202617.1M+13.3%7.2M2.39
    29 May 202615.1M-19.0%6.3M2.40
    15 May 202618.6M+6.0%9.9M1.89
    30 April 202617.6M+5.7%6.3M2.79
    15 April 202616.6M-24.3%6.3M2.65
    31 March 202622.0M-8.3%6.7M3.28
    13 March 202624.0M-8.4%5.3M4.56
    27 February 202626.2M+35.2%7.0M3.75
    13 February 202619.3M+16.4%8.0M2.43
    30 January 202616.6M+15.2%6.6M2.51
    15 January 202614.4M-11.4%7.5M1.91
    31 December 202516.3M-7.3%3.9M4.14
    15 December 202517.5M+0.1%3.4M5.17
    28 November 202517.5M-3.1%4.6M3.80
    14 November 202518.1M+8.2%4.5M4.02
    31 October 202516.7M+6.4%4.2M4.03
    15 October 202515.7M+2.0%3.1M5.13
    30 September 202515.4M-10.0%3.1M5.00
    15 September 202517.1M+2.8%2.3M7.61
    29 August 202516.7M+0.8%2.3M7.39
    15 August 202516.5M+4.2%3.1M5.41
    31 July 202515.9M-6.8%3.4M4.73
    15 July 202517.0M+4.9%2.3M7.39
    30 June 202516.2M-3.5%3.0M5.33
    13 June 202516.8M+5.3%2.8M6.11
    30 May 202516.0M-7.4%2.9M5.43
    15 May 202517.2M-2.2%3.0M5.84
    30 April 202517.6M-0.5%4.1M4.34
    15 April 202517.7M+1.3%3.8M4.64
    31 March 202517.5M+8.0%2.7M6.46
    14 March 202516.2M+2.7%4.5M3.58
    28 February 202515.8M+5.8%4.8M3.29
    14 February 202514.9M+14.7%2.5M5.86
    31 January 202513.0M-2.8%2.2M6.03
    15 January 202513.4M+5.2%2.6M5.15
    31 December 202412.7M+8.1%2.8M4.51
    13 December 202411.8M+5.6%2.1M5.72
    29 November 202411.1M+0.6%2.6M4.31
    15 November 202411.1M-7.2%2.6M4.25
    31 October 202411.9M+47.6%4.5M2.66
    15 October 20248.1M+4.6%1.9M4.22
    30 September 20247.7M-4.6%2.4M3.16
    13 September 20248.1M+8.7%1.9M4.35
    30 August 20247.4M+4.3%1.5M4.93
    15 August 20247.1M+4.3%2.2M3.21
    31 July 20246.8M-10.5%2.8M2.40
    15 July 20247.7M-11.2%2.3M3.40
    28 June 20248.6M-6.8%3.9M2.23
    14 June 20249.2M+3.6%2.5M3.63
    31 May 20248.9M+1.6%1.8M4.83
    15 May 20248.8M-5.6%1.5M6.03
    30 April 20249.3M+7.8%2.5M3.73
    15 April 20248.6M-0.9%1.6M5.26
    28 March 20248.7M+38.3%2.4M3.56
    15 March 20246.3M+11.0%2.6M2.43
    29 February 20245.7M+19.4%2.8M2.00
    15 February 20244.8M-0.8%2.1M2.22
    31 January 20244.8M-2.8%1.6M2.93
    12 January 20244.9M-12.8%1.6M3.00
    29 December 20235.6M-12.1%1.4M3.92
    15 December 20236.4M+1.5%2.4M2.67
    30 November 20236.3M-4.7%1.6M3.92
    15 November 20236.7M+2.1%2.0M3.38
    31 October 20236.5M+16.7%2.8M2.32
    13 October 20235.6M+6.9%1.6M3.44
    29 September 20235.2M-14.1%1.4M3.67
    15 September 20236.1M-15.1%1.8M3.46
    31 August 20237.2M-21.6%1.1M6.29
    15 August 20239.1M-5.7%1.3M6.77
    31 July 20239.7M-11.7%3.3M2.95
    14 July 202311.0M+55.5%2.6M4.19
    30 June 20237.1M+10.6%7.5M1.00
    15 June 20236.4M+4.4%2.0M3.20
    31 May 20236.1M-0.7%1.6M3.78
    15 May 20236.2M+7.6%1.3M4.60
    28 April 20235.7M+7.5%2.2M2.56
    14 April 20235.3M-5.6%1.6M3.42
    31 March 20235.6M+13.6%2.2M2.54
    15 March 20235.0M+4.1%1.9M2.63
    28 February 20234.8M+0.9%3.9M1.22
    15 February 20234.7M-14.1%2.0M2.32
    31 January 20235.5M-12.9%1.9M2.92
    13 January 20236.3M+7.0%1.4M4.36
    30 December 20225.9M+8.3%3.8M1.56
    15 December 20225.4M+17.0%2.3M2.36
    30 November 20224.7M-17.0%2.4M1.97
    15 November 20225.6M-9.8%2.4M2.31
    31 October 20226.2M-14.3%2.6M2.37
    14 October 20227.3M-3.3%2.2M3.35
    30 September 20227.5M+54.9%7.5M1.00
    15 September 20224.8M+84.8%4.1M1.19
    31 August 20222.6M-13.5%1.1M2.30
    15 August 20223.0M-0.3%1.2M2.43
    29 July 20223.0M-10.8%2.1M1.48
    15 July 20223.4M-18.4%1.5M2.27
    30 June 20224.2M-2.0%2.5M1.70
    15 June 20224.3M+0.7%1.8M2.41
    31 May 20224.2M-2.6%1.9M2.26
    13 May 20224.3M-5.1%2.2M2.00
    29 April 20224.6M+23.6%2.2M2.07
    14 April 20223.7M-34.7%1.8M2.08
    31 March 20225.7M+4.3%2.9M1.98
    15 March 20225.4M+0.6%2.8M1.94
    28 February 20225.4M+11.9%5.3M1.03
    15 February 20224.8M+27.2%1.9M2.49
    31 January 20223.8M+4.9%2.0M1.88
    14 January 20223.6M-1.5%2.1M1.70
    31 December 20213.7M-7.0%1.6M2.31
    15 December 20214.0M+8.0%2.3M1.70
    30 November 20213.7M-6.8%1.5M2.38
    15 November 20213.9M-17.5%1.7M2.31
    29 October 20214.8M+19.9%1.6M2.92
    15 October 20214.0M+0.5%1.1M3.56
    30 September 20214.0M-15.6%1.4M2.74
    15 September 20214.7M+9.6%1.6M3.01
    31 August 20214.3M+3.8%1.3M3.18
    13 August 20214.1M-37.0%1.4M2.93
    30 July 20216.5M+18.2%2.1M3.04
    15 July 20215.5M+22.3%2.1M2.63
    30 June 20214.5M-16.4%3.4M1.34
    15 June 20215.4M-7.8%1.9M2.92
    28 May 20215.9M-1.9%1.7M3.49
    14 May 20216.0M+9.9%2.0M3.06
    30 April 20215.4M+8.1%1.8M3.03
    15 April 20215.0M-9.8%2.2M2.28
    31 March 20215.6M+2.2%2.3M2.42
    15 March 20215.4M-24.8%5.5M1.00
    26 February 20217.2M+107.7%4.8M1.50
    12 February 20213.5M-3.2%2.3M1.50
    29 January 20213.6M+32.6%2.9M1.24
    15 January 20212.7M-21.7%1.7M1.57
    31 December 20203.5M+2.0%1.9M1.81
    15 December 20203.4M-16.5%1.7M2.04
    30 November 20204.1M+9.5%1.0M4.05
    13 November 20203.7M-10.9%1.5M2.45
    30 October 20204.2M+11.5%1.6M2.61
    15 October 20203.7M-30.0%1.4M2.73
    30 September 20205.3M+11.7%1.7M3.15
    15 September 20204.8M-8.3%1.8M2.59
    31 August 20205.2M-11.5%1.3M4.03
    14 August 20205.9M-18.5%1.6M3.75
    31 July 20207.2M-30.3%3.9M1.85
    15 July 202010.4M-0.2%2.2M4.64
    30 June 202010.4M+2.1%2.5M4.18
    15 June 202010.2M+21.8%2.4M4.23
    29 May 20208.4M+2.3%4.3M1.94
    15 May 20208.2M+32.7%2.5M3.28
    30 April 20206.2M-16.8%3.6M1.72
    15 April 20207.4M+2.7%2.7M2.75
    31 March 20207.2M+8.9%3.5M2.09
    13 March 20206.6M+26.6%2.9M2.24
    28 February 20205.2M+14.5%3.8M1.36
    14 February 20204.6M+7.5%2.8M1.61
    31 January 20204.2M-19.7%1.9M2.20
    15 January 20205.3M-2.0%2.0M2.69
    31 December 20195.4M+82.0%2.8M1.90
    13 December 20193.0M-39.0%2.5M1.16
    29 November 20194.9M+7.2%3.1M1.57
    15 November 20194.5M-9.6%2.8M1.63
    31 October 20195.0M+81.4%4.2M1.18
    15 October 20192.8M+29.1%2.7M1.03
    30 September 20192.1M-51.2%3.1M1.00
    13 September 20194.4M+14.2%2.8M1.58
    30 August 20193.8M-29.0%2.1M1.82
    15 August 20195.4M+77.6%2.4M2.29
    31 July 20193.0M-10.4%3.1M1.00
    15 July 20193.4M+4.2%2.4M1.40
    28 June 20193.3M-30.0%2.4M1.33
    14 June 20194.7M+7.6%2.8M1.68
    31 May 20194.3M+22.1%2.5M1.73
    15 May 20193.5M-4.0%2.4M1.48
    30 April 20193.7M-6.4%2.5M1.46
    15 April 20193.9M-5.9%2.0M1.99
    29 March 20194.2M-0.2%1.7M2.51
    15 March 20194.2M-23.2%2.4M1.78
    28 February 20195.5M-10.7%2.6M2.06
    15 February 20196.1M-9.6%1.2M4.90
    31 January 20196.8M+17.5%1.8M3.79
    15 January 20195.8M-1.6%1.8M3.12
    31 December 20185.9M-4.2%2.3M2.58
    14 December 20186.1M-12.6%2.1M2.95
    30 November 20187.0M+16.4%2.6M2.70
    15 November 20186.0M-0.3%2.2M2.71
    31 October 20186.0M+16.5%3.7M1.62
    15 October 20185.2M-5.1%3.4M1.51
    28 September 20185.5M-10.8%2.0M2.74
    14 September 20186.1M+4.3%1.6M3.78
    31 August 20185.9M+4.2%1.1M5.47
    15 August 20185.6M-12.6%1.5M3.84
    31 July 20186.4M-11.2%2.1M3.11
    13 July 20187.2M-4.0%2.1M3.52
    29 June 20187.5M+18.7%3.2M2.38
    15 June 20186.4M+13.5%2.3M2.76
    31 May 20185.6M-11.7%1.7M3.26
    15 May 20186.3M-8.2%1.6M3.98
    30 April 20186.9M+9.3%2.6M2.65
    13 April 20186.3M-10.3%1.5M4.11
    29 March 20187.0M+1.2%2.9M2.43
    15 March 20187.0M+0.8%1.9M3.64
    28 February 20186.9M+3.2%2.4M2.84
    15 February 20186.7M-12.5%2.1M3.22
    31 January 20187.7M+11.6%2.8M2.70
    12 January 20186.9M+3.6%1.8M3.91
    29 December 20176.6M2.1M3.15
    Shares in millions (M) or thousands (K); hold the pointer on a figure for the exact count. Counts before a split are restated to today's shares. FINRA publishes consolidated short interest twice a month, about ten days after each settlement.