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Comfort Systems USA (FIX) Short Interest Ratio & Short Volume

Comfort Systems USA logo
$1,164.89 +58.96 (+5.33%)
As of 01:53 PM Eastern
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Comfort Systems USA Short Interest Overview

As of October 30, 2026, Comfort Systems USA (FIX) had a short interest of 864,696 shares sold short, representing 2.50% of the public float. This marks a 14.13% increase in short interest since the prior report. The short interest ratio (days to cover) is 1.3, meaning it would take 1.3 days of the average trading volume of 464,148 shares to cover all short positions.

Current Short Interest
864,696 shares
Previous Short Interest
757,613 shares
Change Vs. Previous Report
14.13%
Dollar Volume Sold Short
$1.06 billion
Short Interest Ratio
1.3 Days to Cover
Last Record Date
October 30, 2026
Outstanding Shares
34,990,000 shares
Short Percent of Float
2.50%
Today's Trading Volume
304,110 shares
Average Trading Volume
464,148 shares
Today's Volume Vs. Average
66%
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Short Interest ChartDays to Cover ChartShort Percent of Float Chart

FIX Short Interest Over Time

FIX Days to Cover Over Time

FIX Percentage of Float Shorted Over Time

Comfort Systems USA Tesla Short Interest History & Recent Changes

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Report DateTotal Shares Sold ShortDollar Volume Sold ShortChange from Previous ReportPercentage of Float ShortedDays to CoverPrice on Report Date
10/30/2026864,696 shares $1.06 billion +14.1%2.5%1.26 $1,227.74
10/15/2026757,613 shares $1.12 billion -10.9%2.2%1.96 $1,483.19
9/30/2026849,979 shares $1.41 billion -0.9%2.4%2.61 $1,658.13
9/15/2026857,812 shares $1.35 billion -5.8%2.5%2.82 $1,577.15
8/31/2026910,248 shares $1.41 billion -0.5%2.6%2.21 $1,548.52
8/14/2026915,049 shares $1.62 billion +31.5%2.6%2.42 $1,774.19
7/31/2026695,921 shares $1.20 billion -17.1%2.0%1.12 $1,728.56
7/15/2026839,258 shares $1.46 billion +12.4%2.4%1.93 $1,736.17
6/30/2026746,501 shares $1.48 billion -5.1%2.1%1.21 $1,981.31
6/15/2026786,903 shares $1.54 billion -4.7%2.3%1.7 $1,951.63
5/29/2026825,373 shares $1.51 billion -8.2%2.4%1.91 $1,827.41
5/15/2026898,803 shares $1.79 billion +18.2%2.6%2.34 $1,994.37
4/30/2026760,735 shares $1.40 billion +0.0%2.2%1.69 $1,844.64
4/15/2026760,531 shares $1.25 billion +22.4%2.2%2.27 $1,649.38
3/31/2026621,334 shares $854.34 million -7.1%1.8%1.37 $1,375.02
3/13/2026669,099 shares $914.25 million +2.5%1.9%1.52 $1,366.39
2/27/2026652,846 shares $933.69 million +1.0%1.9%1.15 $1,430.19
2/13/2026646,648 shares $866.11 million -11.8%1.9%1.62 $1,339.38
1/30/2026732,808 shares $837.10 million -8.6%2.1%2.06 $1,142.32
1/15/2026801,544 shares $875.03 million +3.4%2.3%1.77 $1,091.68
12/31/2025775,068 shares $723.05 million -2.7%2.2%0.74 $932.89
12/15/2025796,621 shares $770.56 million +8.4%2.3%1.69 $967.28
11/28/2025734,974 shares $718.80 million +12.1%2.1%1.04 $978.00
11/14/2025655,811 shares $595.01 million +17.4%1.9%1.72 $907.29
10/31/2025558,433 shares $539.27 million -9.8%1.6%1.17 $965.68
10/15/2025619,300 shares $517.41 million -6.9%1.8%1.5 $835.47
9/30/2025665,100 shares $549.85 million -9.1%1.9%1.7 $826.72
9/15/2025732,000 shares $572.31 million +6.0%2.1%1.8 $781.85
8/31/2025690,900 shares $486.31 million -10.9%2.0%1.8 $703.88
8/15/2025775,800 shares $527.85 million +12.4%2.2%2 $680.39
7/31/2025690,300 shares $485.46 million -11.3%2.0%1.8 $703.25
7/15/2025778,100 shares $420.65 million +2.4%2.2%2.1 $540.62
6/30/2025759,600 shares $407.24 million +13.2%2.2%1.9 $536.12
6/15/2025671,100 shares $330.58 million +13.3%1.9%1.5 $492.60
5/31/2025592,600 shares $283.61 million -46.6%1.7%1.3 $478.59
5/15/20251,110,000 shares $515.91 million +43.1%3.2%2.1 $464.78
4/30/2025775,500 shares $308.07 million -6.6%2.2%1.4 $397.25
4/15/2025830,300 shares $296.14 million -3.7%2.4%1.4 $356.66
3/31/2025862,100 shares $278.08 million +18.6%2.5%1.5 $322.56
3/15/2025726,700 shares $248.47 million -29.5%2.1%1.4 $341.92
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2/28/20251,030,000 shares $372.88 million +38.9%2.9%2.1 $362.02
2/15/2025741,400 shares $290.18 million +2.5%2.1%1.7 $391.40
1/31/2025723,000 shares $317.18 million +8.8%2.1%1.9 $438.70
1/15/2025664,800 shares $327.82 million -10.7%1.9%1.8 $493.11
12/31/2024744,700 shares $315.80 million +17.4%2.1%2.2 $424.06
12/15/2024634,300 shares $293.26 million -2.8%1.8%2 $462.33
11/30/2024652,600 shares $321.91 million -3.9%1.9%2.1 $493.27
11/15/2024679,100 shares $302.21 million +26.7%1.9%2.1 $445.02
10/31/2024536,200 shares $209.55 million +40.3%1.5%1.7 $390.80
10/15/2024382,300 shares $158.16 million -13.7%1.1%1.2 $413.71
9/30/2024442,900 shares $172.92 million -8.7%1.3%1.3 $390.42
9/15/2024485,300 shares $168.75 million -25.5%1.4%1.1 $347.73
8/31/2024651,000 shares $230.14 million +17.6%1.9%1.4 $353.52
8/15/2024553,600 shares $186.81 million +5.7%1.6%1.2 $337.44
7/31/2024523,800 shares $174.14 million -23.3%1.5%1.1 $332.46
7/15/2024683,000 shares $220.41 million -46.6%1.9%1.5 $322.71
6/30/20241,280,000 shares $389.27 million +16.4%3.6%2.8 $304.12
6/15/20241,100,000 shares $345.24 million -7.6%3.1%3.1 $313.85
5/31/20241,190,000 shares $389.51 million -13.1%3.4%3.2 $327.32
5/15/20241,370,000 shares $464.53 million +17.1%3.9%3.4 $339.07
4/30/20241,170,000 shares $361.94 million -4.9%3.3%3 $309.35
4/15/20241,230,000 shares $373.91 million +13.9%3.5%3.4 $303.99
3/31/20241,080,000 shares $343.13 million No Change3.1%3 $317.71
3/15/20241,080,000 shares $333.46 million -16.3%3.1%3.1 $308.76
2/29/20241,290,000 shares $393.57 million +12.2%3.7%3 $305.09
2/15/20241,150,000 shares $290.96 million +15.0%3.3%2.9 $253.01
1/31/2024999,800 shares $217.19 million +1.1%2.9%2.5 $217.23
1/15/2024988,800 shares $201.05 million -10.1%2.8%2.4 $203.33
12/31/20231,100,000 shares $226.24 million -9.1%3.1%2.7 $205.67
12/15/20231,210,000 shares $246.14 million -6.2%3.5%2.9 $203.42
11/30/20231,290,000 shares $249.72 million -1.5%3.7%4 $193.58
11/15/20231,310,000 shares $261.10 million +6.5%3.7%4.2 $199.31
10/31/20231,230,000 shares $223.68 million +35.4%3.5%4.2 $181.85
10/15/2023908,300 shares $144.27 million +4.1%2.6%3.5 $158.84
9/30/2023872,700 shares $148.72 million -1.0%2.5%3.7 $170.41
9/15/2023881,300 shares $165.47 million +10.5%2.5%3.9 $187.76
8/31/2023797,500 shares $147.19 million +36.3%2.3%3.5 $184.57
8/15/2023585,100 shares $104.69 million -2.9%1.7%2.6 $178.93
7/31/2023602,500 shares $104.77 million -5.3%1.7%2.7 $173.89
7/15/2023636,300 shares $104.21 million -2.5%1.8%2.5 $163.78
6/30/2023652,700 shares $107.12 million -4.5%1.9%2.5 $164.12
6/15/2023683,500 shares $111.16 million -13.0%2.0%2.5 $162.64
5/31/2023785,300 shares $116.21 million +9.6%2.2%2.8 $147.98
5/15/2023716,800 shares $108.56 million -5.3%2.1%2.4 $151.45
4/30/2023757,200 shares $113.19 million -11.5%2.2%2.6 $149.49
4/15/2023855,400 shares $112.04 million +20.3%2.5%3.3 $130.98
3/31/2023710,800 shares $103.75 million +11.7%2.0%2.7 $145.96
3/15/2023636,100 shares $86.59 million +12.1%1.8%2.7 $136.12
2/28/2023567,600 shares $82.55 million +13.3%1.6%2.6 $145.44
2/15/2023500,800 shares $62.34 million -2.9%1.4%2.5 $124.48
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1/31/2023515,800 shares $62.43 million +8.5%1.5%2.7 $121.04
1/15/2023475,600 shares $59.08 million -9.0%1.4%2.3 $124.23
12/30/2022522,500 shares $60.13 million +15.4%1.5%2.6 $115.08
12/15/2022452,900 shares $53.23 million -2.7%1.3%2.2 $117.53
11/30/2022465,500 shares $59.01 million -26.3%1.3%2.3 $126.76
11/15/2022632,000 shares $76.67 million -17.1%1.8%3.3 $121.31
10/31/2022762,600 shares $94.01 million -13.2%2.2%4.3 $123.28
10/15/2022878,700 shares $89.03 million +4.6%2.5%5.2 $101.32
9/30/2022839,900 shares $81.75 million +5.0%2.4%5.3 $97.33
9/15/2022800,000 shares $79.27 million +1.9%2.3%5.2 $99.09
8/31/2022784,800 shares $78.75 million +8.4%2.3%5.1 $100.34
8/15/2022723,800 shares $78.37 million -19.6%2.1%4.6 $108.27
7/31/2022900,700 shares $95.17 million +2.4%2.6%5.7 $105.66
7/15/2022879,700 shares $75.00 million +6.9%2.5%6 $85.26
6/30/2022822,800 shares $68.42 million +30.4%2.3%5.5 $83.15
6/15/2022630,900 shares $52.91 million +9.6%1.8%4.3 $83.87
5/31/2022575,800 shares $51.66 million -14.5%1.6%4 $89.72
5/15/2022673,600 shares $56.65 million +20.1%1.9%4.4 $84.10
4/30/2022560,800 shares $47.34 million -17.2%1.6%3.7 $84.42
4/15/2022677,400 shares $60.00 million +6.7%1.9%4.1 $88.57
3/31/2022635,100 shares $56.53 million -10.5%1.8%3.6 $89.01
3/15/2022709,600 shares $64.66 million +8.9%2.0%4.2 $91.12
2/28/2022651,600 shares $56.02 million +8.0%1.9%3.8 $85.98
2/15/2022603,300 shares $54.03 million -1.1%1.7%3.6 $89.55
1/31/2022609,800 shares $54.75 million +18.5%1.7%3.9 $89.78
1/15/2022514,800 shares $49.90 million -12.8%1.5%3.4 $96.94
12/31/2021590,200 shares $58.39 million -5.1%1.7%4.2 $98.94
12/15/2021622,000 shares $61.40 million +19.4%1.8%4.3 $98.72
11/30/2021521,100 shares $49.44 million -16.8%1.5%3.8 $94.87
11/15/2021626,300 shares $63.04 million -12.7%1.8%4.7 $100.65

FIX Short Interest - Frequently Asked Questions

Short interest is the volume of Comfort Systems USA shares that have been sold short but have not yet been closed out or covered. As of October 30th, traders have sold 864,696 shares of FIX short. 2.50% of Comfort Systems USA's shares are currently sold short. Learn More on Comfort Systems USA's current short interest.

The short interest ratio, also known as the "days to cover ratio", is calculated by dividing the number of shares of a stock sold short divided by its average trading volume. A short interest ratio ranging between 1 and 4 generally indicates strong positive sentiment about a stock and a lack of short sellers. A short interest ratio of 10 or greater indicates strong pessimism about a stock. FIX shares currently have a short interest ratio of 1.3. Learn More on Comfort Systems USA's short interest ratio.

Companies that have a short interest as a percentage of float below 10% indicates positive investor sentiment and few short sellers. Stocks with a short interest percentage above 10% is considered high, suggesting some investors are pessimistic about the stock. Companies with a short interest percentage of 20% or more indicates widespread negative sentiment. 2.50% of Comfort Systems USA's floating shares are currently sold short.

Comfort Systems USA saw an increase in short interest since the prior report. As of October 30th, there was short interest totaling 864,696 shares, an increase of 14.1% from the previous total of 757,613 shares. Changes in short volume can be used to identify positive and negative investor sentiment. Investors that short sell a stock are betting that its price will decline in the future. An increase in short sale volume suggests bearish (negative) sentiment among investors. A decrease on short sale volume suggests bullish (positive) sentiment.

2.50% of Comfort Systems USA's shares are currently sold short. Here is how the short interest of companies in the sector of "industrials" compare to Comfort Systems USA: IES Holdings, Inc. (8.76%), MYR Group, Inc. (4.48%), Sterling Infrastructure, Inc. (4.69%), EMCOR Group, Inc. (1.73%), Eaton Corporation, PLC (1.85%), GE Vernova Inc. (2.83%), Modine Manufacturing Company (4.69%), nVent Electric PLC (3.58%), Quanta Services, Inc. (2.33%), Vertiv Holdings Co. (2.91%),

As of the most recent reporting period, the following stocks had the largest short interest positions: SPDR S&P 500 ETF Trust ($77.66 billion), Invesco QQQ ($57.17 billion), iShares Russell 2000 ETF ($21.91 billion), SPDR S&P Biotech ETF ($10.53 billion), Union Pacific Corporation ($9.26 billion), iShares iBoxx $ High Yield Corporate Bond ETF ($9.05 billion), Nebius Group N.V. ($7.85 billion), iShares 20+ Year Treasury Bond ETF ($7.81 billion), Moderna, Inc. ($7.36 billion), and iShares iBoxx $ Investment Grade Corporate Bond ETF ($7.20 billion). View all of the most shorted stocks.

Short selling FIX is an investing strategy that aims to generate trading profit from Comfort Systems USA as its price is falling. FIX shares are trading up $58.96 today. To short a stock, an investor borrows shares, sells them and buys the shares back on the public market later to return it to the lender. Short sellers are betting that a stock will decline in price. If the stock does drop after selling, the short seller buys it back at a lower price and returns it to the lender. The difference between the sell price and the buy price is the trader's profit.

A short squeeze for Comfort Systems USA occurs when it has a large amount of short interest and its stock increases in price. This forces short sellers to cover their short interest positions by buying actual shares of FIX, which in turn drives the price of the stock up even further.

Short interest is typically published by a stock exchange once per month. However, NASDAQ publishes a report for U.S. stocks, including FIX, twice per month. The most recent reporting period available is October, 30 2026.

Understanding short interest metrics can help you assess how traders are positioning around a stock like FIX:

  • Shares Sold Short: The total number of shares that have been sold by short sellers but have not yet been covered or closed out. A high number may indicate bearish sentiment.
  • Short Float: The percentage of a company’s publicly available shares (or "float") that are sold short. A higher short float suggests a greater portion of the stock is being bet against.
  • Days to Cover (Short Interest Ratio): This estimates how many days it would take short sellers to cover their positions, based on average daily trading volume. Higher values can signal potential for a short squeeze if buying pressure increases.

These metrics are often used by traders to gauge sentiment, volatility risk, and the potential for price movements based on short covering activity.


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Short interest data for NYSE:FIX is sourced from the Financial Industry Regulatory Authority (FINRA), with the most recent report published on 11/10/2026. FINRA publishes updated short interest twice a month.
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