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Comfort Systems USA Inc. short interest

758K shares of Comfort Systems USA were sold short at the 15 October 2026 settlement, near the middle of its range over the last year (558K to 915K). Short sellers would need 2.0 days of normal trading to buy them back.

Shares sold short758Kat 15 Oct 2026
Change on the settlement before-10.9%+22% over a year
Days to cover1.96at 386K shares a day
Of shares in issue2.16%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 middle of its range over the last year (558K to 915K), and the share price moved +22% 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 2026758K-10.9%386K1.96
    30 September 2026850K-0.9%326K2.61
    15 September 2026858K-5.8%304K2.82
    31 August 2026910K-0.5%412K2.21
    14 August 2026915K+31.5%379K2.42
    31 July 2026696K-17.1%621K1.12
    15 July 2026839K+12.4%435K1.93
    30 June 2026747K-5.1%618K1.21
    15 June 2026787K-4.7%463K1.70
    29 May 2026825K-8.2%433K1.91
    15 May 2026899K+18.1%384K2.34
    30 April 2026761K+0.0%451K1.69
    15 April 2026761K+22.4%335K2.27
    31 March 2026621K-7.1%455K1.37
    13 March 2026669K+2.5%440K1.52
    27 February 2026653K+1.0%566K1.15
    13 February 2026647K-11.8%399K1.62
    30 January 2026733K-8.6%357K2.06
    15 January 2026802K+3.4%452K1.77
    31 December 2025775K-2.7%1.0M1.00
    15 December 2025797K+8.4%470K1.69
    28 November 2025735K+12.1%710K1.04
    14 November 2025656K+17.4%380K1.72
    31 October 2025558K-9.8%478K1.17
    15 October 2025619K-6.9%304K2.04
    30 September 2025665K-9.1%400K1.66
    15 September 2025732K+5.9%408K1.80
    29 August 2025691K-10.9%368K1.88
    15 August 2025776K+12.4%399K1.94
    31 July 2025690K-11.3%490K1.41
    15 July 2025778K+2.4%306K2.54
    30 June 2025760K+13.2%386K1.97
    13 June 2025671K+13.2%339K1.98
    30 May 2025593K-46.6%313K1.89
    15 May 20251.1M+43.0%399K2.78
    30 April 2025775K-6.6%494K1.57
    15 April 2025830K-3.7%558K1.49
    31 March 2025862K+18.6%557K1.55
    14 March 2025727K-29.2%619K1.17
    28 February 20251.0M+38.5%777K1.32
    14 February 2025741K+2.5%495K1.50
    31 January 2025723K+8.8%591K1.22
    15 January 2025665K-10.7%384K1.73
    31 December 2024745K+17.4%302K2.47
    13 December 2024634K-2.8%270K2.35
    29 November 2024653K-3.9%352K1.86
    15 November 2024679K+26.6%350K1.94
    31 October 2024536K+40.2%398K1.35
    15 October 2024382K-13.7%240K1.59
    30 September 2024443K-8.7%304K1.46
    13 September 2024485K-25.5%291K1.67
    30 August 2024651K+17.6%311K2.09
    15 August 2024554K+5.7%366K1.51
    31 July 2024524K-23.3%546K1.00
    15 July 2024683K-46.5%371K1.84
    28 June 20241.3M+16.1%967K1.32
    14 June 20241.1M-7.2%373K2.95
    31 May 20241.2M-13.3%358K3.31
    15 May 20241.4M+16.5%388K3.52
    30 April 20241.2M-4.2%382K3.07
    15 April 20241.2M+12.9%297K4.12
    28 March 20241.1M+0.1%284K3.82
    15 March 20241.1M-15.9%575K1.88
    29 February 20241.3M+11.8%474K2.72
    15 February 20241.2M+15.2%294K3.92
    31 January 20241,000K+1.1%241K4.15
    12 January 2024989K-10.0%319K3.10
    29 December 20231.1M-9.0%228K4.81
    15 December 20231.2M-6.3%936K1.29
    30 November 20231.3M-1.5%265K4.87
    15 November 20231.3M+6.7%406K3.22
    31 October 20231.2M+35.1%375K3.27
    13 October 2023908K+4.1%237K3.83
    29 September 2023873K-1.0%245K3.56
    15 September 2023881K+10.5%361K2.44
    31 August 2023797K+36.3%248K3.22
    15 August 2023585K-2.9%202K2.90
    31 July 2023603K-5.3%195K3.09
    14 July 2023636K-2.5%148K4.30
    30 June 2023653K-4.5%269K2.43
    15 June 2023683K-13.0%272K2.51
    31 May 2023785K+9.5%223K3.52
    15 May 2023717K-5.3%299K2.40
    28 April 2023757K-11.5%308K2.46
    14 April 2023855K+20.3%292K2.93
    31 March 2023711K+11.7%307K2.31
    15 March 2023636K+12.1%269K2.36
    28 February 2023568K+13.3%402K1.41
    15 February 2023501K-2.9%194K2.59
    31 January 2023516K+8.5%143K3.60
    13 January 2023476K-9.0%227K2.09
    30 December 2022522K+15.4%165K3.18
    15 December 2022453K-2.7%171K2.65
    30 November 2022465K-26.4%241K1.93
    15 November 2022632K-17.1%234K2.70
    31 October 2022763K-13.2%219K3.48
    14 October 2022879K+4.6%178K4.93
    30 September 2022840K+5.0%189K4.45
    15 September 2022800K+1.9%134K5.99
    31 August 2022785K+8.4%138K5.70
    15 August 2022724K-19.6%180K4.03
    29 July 2022901K+2.4%154K5.84
    15 July 2022880K+6.9%120K7.34
    30 June 2022823K+30.4%203K4.05
    15 June 2022631K+9.6%135K4.66
    31 May 2022576K-14.5%164K3.52
    13 May 2022674K+20.1%140K4.81
    29 April 2022561K-17.2%133K4.21
    14 April 2022677K+6.7%129K5.24
    31 March 2022635K-10.5%171K3.71
    15 March 2022710K+8.9%169K4.21
    28 February 2022652K+8.0%178K3.65
    15 February 2022603K-1.1%179K3.37
    31 January 2022610K+18.4%199K3.06
    14 January 2022515K-12.8%162K3.18
    31 December 2021590K-5.1%154K3.82
    15 December 2021622K+19.4%152K4.08
    30 November 2021521K-16.8%122K4.26
    15 November 2021626K-12.7%126K4.96
    29 October 2021718K-2.0%149K4.83
    15 October 2021732K+2.9%134K5.48
    30 September 2021711K-5.0%176K4.04
    15 September 2021749K+2.5%113K6.61
    31 August 2021730K+3.1%106K6.88
    13 August 2021708K+14.6%144K4.93
    30 July 2021618K+0.7%125K4.94
    15 July 2021614K+17.4%121K5.06
    30 June 2021523K-23.6%286K1.83
    15 June 2021684K+15.4%227K3.02
    28 May 2021593K-17.6%105K5.64
    14 May 2021719K+16.6%168K4.29
    30 April 2021617K-1.9%164K3.76
    15 April 2021629K-3.9%177K3.56
    31 March 2021654K-23.2%182K3.60
    15 March 2021852K-15.2%312K2.73
    26 February 20211.0M-0.9%157K6.40
    12 February 20211.0M-9.1%265K3.83
    29 January 20211.1M+16.6%210K5.32
    15 January 2021957K-5.3%212K4.50
    31 December 20201.0M+24.1%203K4.97
    15 December 2020814K+48.8%168K4.85
    30 November 2020547K-25.5%217K2.52
    13 November 2020734K+4.1%229K3.20
    30 October 2020705K+2.5%306K2.30
    15 October 2020688K-3.5%199K3.46
    30 September 2020713K-6.8%260K2.74
    15 September 2020765K-2.9%246K3.11
    31 August 2020788K-2.7%232K3.39
    14 August 2020810K-5.9%306K2.65
    31 July 2020860K-4.5%293K2.94
    15 July 2020901K-0.1%185K4.86
    30 June 2020902K-1.7%238K3.79
    15 June 2020917K+8.8%223K4.12
    29 May 2020843K+1.5%275K3.07
    15 May 2020831K-5.9%258K3.22
    30 April 2020883K+16.7%438K2.02
    15 April 2020756K+7.4%285K2.66
    31 March 2020704K-24.1%385K1.83
    13 March 2020928K+30.4%336K2.76
    28 February 2020712K-15.8%262K2.72
    14 February 2020846K+9.2%171K4.96
    31 January 2020775K+10.6%146K5.29
    15 January 2020700K-15.6%181K3.87
    31 December 2019829K-2.7%214K3.87
    13 December 2019853K+16.8%212K4.02
    29 November 2019730K+18.3%190K3.83
    15 November 2019617K-16.8%225K2.74
    31 October 2019742K-11.3%396K1.87
    15 October 2019836K+2.3%361K2.32
    30 September 2019817K+9.2%442K1.85
    13 September 2019748K+19.1%377K1.98
    30 August 2019628K+9.0%377K1.67
    15 August 2019576K-13.1%406K1.42
    31 July 2019663K+6.0%443K1.50
    15 July 2019626K+3.7%152K4.12
    28 June 2019604K+9.7%215K2.80
    14 June 2019550K-7.9%159K3.47
    31 May 2019598K+14.9%229K2.61
    15 May 2019520K-0.0%248K2.10
    30 April 2019521K-5.3%341K1.53
    15 April 2019549K-3.6%285K1.93
    29 March 2019570K+43.3%217K2.63
    15 March 2019398K-9.3%208K1.91
    28 February 2019439K-18.5%292K1.50
    15 February 2019538K+12.6%150K3.58
    31 January 2019478K-18.9%183K2.61
    15 January 2019589K-8.2%243K2.42
    31 December 2018641K-9.6%286K2.25
    14 December 2018709K-10.4%251K2.82
    30 November 2018792K+14.0%279K2.84
    15 November 2018695K-26.2%337K2.06
    31 October 2018941K+15.4%383K2.45
    15 October 2018815K+44.2%348K2.34
    28 September 2018565K-35.1%319K1.77
    14 September 2018871K-5.3%226K3.85
    31 August 2018920K+182.3%370K2.49
    15 August 2018326K-11.8%352K1.00
    31 July 2018369K+27.4%299K1.24
    13 July 2018290K+8.9%113K2.56
    29 June 2018266K-10.7%319K1.00
    15 June 2018298K+1.9%151K1.97
    31 May 2018293K-8.9%163K1.80
    15 May 2018321K+5.9%134K2.40
    30 April 2018303K-5.9%157K1.94
    13 April 2018322K+15.7%137K2.36
    29 March 2018279K+0.7%178K1.57
    15 March 2018277K+35.2%170K1.63
    28 February 2018205K-4.8%195K1.05
    15 February 2018215K-29.3%150K1.43
    31 January 2018304K-20.9%124K2.46
    12 January 2018384K-11.0%162K2.37
    29 December 2017432K101K4.28
    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.