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HowShorted

How shorted is Comfort Systems USA, Inc.? FIX

#2,730most shorted US stockof 3,805 ranked stocks, more shorted than 28%

2.44%
of shares outstanding reported short · settlement date 15 Sep 2026
vs previous report
−0.15
5 reports (~10 weeks)
+0.32
days to cover
2.82
Aggregate net short position time series for Comfort Systems USA, Inc.

Markers along the chart's base: ▲ results announced (an 8-K reporting results was filed) ▲ quarterly or annual report filed. Dates are SEC filing dates; hover a point to see events since the previous settlement.

Days to cover

FINRA's own figure: reported shares short divided by the stock's average daily trading volume, published alongside each settlement. It expresses the short position in days of typical trading rather than as a percentage of the company; the two can move differently.

Aggregate net short position time series for Comfort Systems USA, Inc. days to cover

Short interest around results

For each results announcement (an 8-K reporting results, by its SEC filing date), the FINRA settlement before it and the first one after. Settlements fall twice a month, so the two figures can sit up to a month apart and much else changes in between: this shows what was reported, not why.

Reported short interest before and after each results announcement
Results filedSettlement beforeSettlement afterChange
23 Jul 20262.38% 15 Jul 20261.98% 31 Jul 2026−0.40
23 Apr 20262.16% 15 Apr 20262.16% 30 Apr 20260.00
19 Feb 20261.84% 13 Feb 20261.86% 27 Feb 2026+0.02
23 Oct 20251.76% 15 Oct 20251.58% 31 Oct 2025−0.18
24 Jul 20252.21% 15 Jul 20251.96% 31 Jul 2025−0.25
24 Apr 20252.34% 15 Apr 20252.20% 30 Apr 2025−0.14
20 Feb 20252.09% 14 Feb 20252.89% 28 Feb 2025+0.80
24 Oct 20241.07% 15 Oct 20241.51% 31 Oct 2024+0.44

Fails to deliver

The SEC's fails-to-deliver figure for FIX: the aggregate net balance of shares that failed to be delivered at each settlement date, published by the SEC twice a month and shown here verbatim for the trailing window. A balance is not a daily flow, and a fail has many ordinary causes; the SEC says it cannot guarantee the accuracy of the data. See what fails to deliver are and the largest balances today.

Last balance on file
7
17 Aug 2026
Highest in window
16,637
15 Jun 2026
Days with a balance
35
Window
16 Sep 2025 to 14 Sep 2026
Aggregate net short position time series for Comfort Systems USA, Inc. fails to deliver

Source: U.S. Securities and Exchange Commission, fails-to-deliver data (public domain). Only settlement days with a positive balance appear; the largest balance in the window was 17K shares.

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Sector: Industrials

History

Full reported short interest history
Settlement dateShort %Change
15 Sep 20262.44%−0.15
31 Aug 20262.59%−0.01
14 Aug 20262.60%+0.62
31 Jul 20261.98%−0.40
15 Jul 20262.38%+0.26
30 Jun 20262.12%−0.12
15 Jun 20262.24%−0.10
29 May 20262.34%−0.21
15 May 20262.55%+0.39
30 Apr 20262.16%0.00
15 Apr 20262.16%+0.39
31 Mar 20261.77%−0.13
13 Mar 20261.90%+0.04
27 Feb 20261.86%+0.02
13 Feb 20261.84%−0.24
30 Jan 20262.08%−0.19
15 Jan 20262.27%+0.07
31 Dec 20252.20%−0.06
15 Dec 20252.26%+0.18
28 Nov 20252.08%+0.22
14 Nov 20251.86%+0.28
31 Oct 20251.58%−0.18
15 Oct 20251.76%−0.13
30 Sep 20251.89%−0.18
15 Sep 20252.07%+0.11
29 Aug 20251.96%−0.24
15 Aug 20252.20%+0.24
31 Jul 20251.96%−0.25
15 Jul 20252.21%+0.06
30 Jun 20252.15%+0.25
13 Jun 20251.90%+0.22
30 May 20251.68%−1.46
15 May 20253.14%+0.94
30 Apr 20252.20%−0.14
15 Apr 20252.34%−0.08
31 Mar 20252.42%+0.38
14 Mar 20252.04%−0.85
28 Feb 20252.89%+0.80
14 Feb 20252.09%+0.06
31 Jan 20252.03%+0.16
15 Jan 20251.87%−0.22
31 Dec 20242.09%+0.31
13 Dec 20241.78%−0.05
29 Nov 20241.83%−0.08
15 Nov 20241.91%+0.40
31 Oct 20241.51%+0.44
15 Oct 20241.07%−0.17
30 Sep 20241.24%−0.12
13 Sep 20241.36%−0.46
30 Aug 20241.82%+0.27
15 Aug 20241.55%+0.08
31 Jul 20241.47%−0.44
15 Jul 20241.91%−1.66
28 Jun 20243.57%+0.49
14 Jun 20243.08%−0.24
31 May 20243.32%−0.51
15 May 20243.83%+0.54
30 Apr 20243.29%−0.14
15 Apr 20243.43%+0.39
28 Mar 20243.04%+0.01
15 Mar 20243.03%−0.58
29 Feb 20243.61%+0.38
15 Feb 20243.23%+0.43
31 Jan 20242.80%+0.03
12 Jan 20242.77%−0.31
29 Dec 20233.08%−0.30
15 Dec 20233.38%−0.23
30 Nov 20233.61%−0.06
15 Nov 20233.67%+0.23
31 Oct 20233.44%+0.90
13 Oct 20232.54%+0.10
29 Sep 20232.44%−0.02
15 Sep 20232.46%+0.23
31 Aug 20232.23%+0.59
15 Aug 20231.64%−0.04
31 Jul 20231.68%−0.10
14 Jul 20231.78%−0.04
30 Jun 20231.82%−0.09
15 Jun 20231.91%−0.29
31 May 20232.20%+0.20
15 May 20232.00%−0.12
28 Apr 20232.12%−0.27
14 Apr 20232.39%+0.40
31 Mar 20231.99%+0.21
15 Mar 20231.78%+0.19
28 Feb 20231.59%+0.19
15 Feb 20231.40%−0.04
31 Jan 20231.44%+0.11
13 Jan 20231.33%−0.13
30 Dec 20221.46%+0.19
15 Dec 20221.27%−0.03
30 Nov 20221.30%−0.47
15 Nov 20221.77%−0.36
31 Oct 20222.13%−0.33
14 Oct 20222.46%+0.11
30 Sep 20222.35%+0.11
15 Sep 20222.24%+0.05
31 Aug 20222.19%+0.17
15 Aug 20222.02%−0.50
29 Jul 20222.52%+0.08
15 Jul 20222.44%+0.15
30 Jun 20222.29%+0.54
15 Jun 20221.75%+0.15
31 May 20221.60%−0.27
13 May 20221.87%+0.31
29 Apr 20221.56%−0.32
14 Apr 20221.88%+0.12
31 Mar 20221.76%−0.21
15 Mar 20221.97%+0.16
28 Feb 20221.81%+0.14
15 Feb 20221.67%−0.02
31 Jan 20221.69%+0.26
14 Jan 20221.43%−0.21
31 Dec 20211.64%−0.09
15 Dec 20211.73%+0.28
30 Nov 20211.45%−0.29
15 Nov 20211.74%−0.25
29 Oct 20211.99%−0.03
15 Oct 20212.02%+0.06
30 Sep 20211.96%−0.10
15 Sep 20212.06%+0.05
31 Aug 20212.01%+0.06
13 Aug 20211.95%+0.25
30 Jul 20211.70%+0.01
15 Jul 20211.69%+0.25
30 Jun 20211.44%−0.44
15 Jun 20211.88%+0.25
28 May 20211.63%−0.35
14 May 20211.98%+0.28
30 Apr 20211.70%−0.03
15 Apr 20211.73%−0.07
31 Mar 20211.80%−0.54
15 Mar 20212.34%−0.42
26 Feb 20212.76%−0.03
12 Feb 20212.79%−0.28
29 Jan 20213.07%+0.44
15 Jan 20212.63%−0.15
31 Dec 20202.78%+0.54
15 Dec 20202.24%+0.74
30 Nov 20201.50%−0.52
13 Nov 20202.02%+0.08
30 Oct 20201.94%+0.05
15 Oct 20201.89%−0.06
30 Sep 20201.95%−0.15
15 Sep 20202.10%−0.06
31 Aug 20202.16%−0.06
14 Aug 20202.22%−0.14
31 Jul 20202.36%−0.11
15 Jul 20202.47%0.00
30 Jun 20202.47%−0.04
15 Jun 20202.51%+0.20
29 May 20202.31%+0.03
15 May 20202.28%−0.14
30 Apr 20202.42%+0.36
15 Apr 20202.06%+0.14
31 Mar 20201.92%−0.61
13 Mar 20202.53%+0.59
28 Feb 20201.94%−0.37
14 Feb 20202.31%+0.20
31 Jan 20202.11%+0.20
15 Jan 20201.91%−0.35
31 Dec 20192.26%−0.06
13 Dec 20192.32%+0.33
29 Nov 20191.99%+0.31
15 Nov 20191.68%−0.34
31 Oct 20192.02%−0.25
15 Oct 20192.27%+0.05
30 Sep 20192.22%+0.19
13 Sep 20192.03%+0.33
30 Aug 20191.70%+0.14
15 Aug 20191.56%−0.24
31 Jul 20191.80%+0.10
15 Jul 20191.70%+0.06
28 Jun 20191.64%+0.15
14 Jun 20191.49%−0.13
31 May 20191.62%+0.21
15 May 20191.41%0.00
30 Apr 20191.41%−0.07
15 Apr 20191.48%−0.05
29 Mar 20191.53%+0.46
15 Mar 20191.07%−0.11
28 Feb 20191.18%−0.27
15 Feb 20191.45%+0.16
31 Jan 20191.29%−0.30
15 Jan 20191.59%−0.14
31 Dec 20181.73%−0.18
14 Dec 20181.91%−0.22
30 Nov 20182.13%+0.26
15 Nov 20181.87%−0.66
31 Oct 20182.53%+0.34
15 Oct 20182.19%+0.67
28 Sep 20181.52%+0.65
15 Aug 20180.87%−0.12
31 Jul 20180.99%+0.21
13 Jul 20180.78%+0.06
29 Jun 20180.72%−0.08
15 Jun 20180.80%+0.01
31 May 20180.79%−0.08
15 May 20180.87%+0.05
30 Apr 20180.82%−0.05
13 Apr 20180.87%+0.12
29 Mar 20180.75%+0.01
15 Mar 20180.74%+0.19
28 Feb 20180.55%−0.03
15 Feb 20180.58%−0.24
31 Jan 20180.82%−0.22
12 Jan 20181.04%−0.12
29 Dec 20171.16%–

Newest first. Scroll inside the table for earlier dates, back to 29 Dec 2017.

Frequently asked questions

How shorted is Comfort Systems USA, Inc. right now?
2.44% of Comfort Systems USA, Inc.'s (FIX) shares outstanding were reported short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report. That makes it the 2,730th most shorted US stock, out of 3,805 we rank.
What does this number include?
FINRA member firms must report their short positions in all US equities twice a month; FINRA consolidates them per security. We divide that official share count by the company's shares outstanding from its SEC filings. This is the regulatory figure, not a daily estimate.
Why does it only update twice a month?
US short interest is reported for settlement on the 15th and the last business day of each month, and FINRA publishes the consolidated figures about nine business days later. That cadence is set by regulation; no daily official figure exists.
Is this FIX's short float?
No. This is short interest as a percentage of shares outstanding, the count in the company's SEC filings. "Short float" divides the same FINRA short count by the public float, which excludes closely held shares, so it comes out higher for the same company. We publish no float estimates: the float is not a regulatory figure.
What is FIX's days to cover?
2.82 days for settlement date 15 Sep 2026: FINRA's own short interest ratio, the reported shares short divided by average daily trading volume. It is published in the same FINRA file and shown verbatim; we hold no volume data ourselves.
Which funds are short?
US public short interest is aggregate-only: individual short sellers are not named. Only some EU markets publish named positions.