This page tracks how heavily Comfort Systems USA (NYSE:FIX) is being shorted: ORTEX's daily short interest estimate, the cost to borrow the shares, utilization of the lendable supply and days to cover, next to the official exchange-reported figure.

Short interest: The number of shares that have been sold short and not yet bought back, usually shown as a percentage of free float (the shares available to trade). ORTEX estimates it every day from securities-lending data, instead of waiting for exchange reports that are published only twice a month and about two weeks late.
Cost to borrow: The annualised fee a short seller pays to borrow the shares, as a percentage of the position's value. A rising cost to borrow means lendable shares are getting scarce and holding the short is getting more expensive.
Utilization: The share of the lendable supply of a stock that is currently on loan. Close to 100% means almost no shares are left to borrow.
Days to cover: Short interest divided by average daily trading volume: roughly how many days of normal trading it would take for every short seller to buy back their shares.
Exchange-reported short interest: The official figure published by the exchange or regulator (in the US, FINRA twice a month). It is accurate but delayed, which is the gap the ORTEX daily and intraday estimates fill.

Source: ORTEX. Some figures are limited on the free view; live data and full history are part of ORTEX Advanced.

FIX key data

Comfort Systems USA (NYSE: FIX) has a market capitalization of $38.12B. Last close $1,091.31 (as of 2026-11-05); 52-week range $841.66 to $2,073.99. ORTEX data as of 2026-11-03: short interest is 2.24% of free float, 1.3 days to cover and the average cost to borrow is 0.26%.

Latest on FIX

Oct 19, 2026FIX Faces Earnings With a 16% Weekly Sell-Off to Explain
Jul 24, 2026FIX Rebounds 9% Into Earnings as Bulls and Bears Dig In

All FIX news on ORTEX News

Comfort Systems USA (FIX) Short Interest

NYSE • FIX • US1999081045

Ex-dividend 12 Nov · 1 USD (special)

1091.31Last close

Market Closed

Ex-dividend 12 Nov · 1 USD (special)

As of Nov 3, 2026, ORTEX estimates 2.2% of free float is sold short, 1.3 days to cover, cost to borrow 0.26%.

About this data: FIX short interest, cost to borrow and days to cover

Short interest: The number of shares that have been sold short and not yet bought back, usually shown as a percentage of free float (the shares available to trade). ORTEX estimates it every day from securities-lending data, instead of waiting for exchange reports that are published only twice a month and about two weeks late.
Cost to borrow: The annualised fee a short seller pays to borrow the shares, as a percentage of the position's value. A rising cost to borrow means lendable shares are getting scarce and holding the short is getting more expensive.
Utilization: The share of the lendable supply of a stock that is currently on loan. Close to 100% means almost no shares are left to borrow.
Days to cover: Short interest divided by average daily trading volume: roughly how many days of normal trading it would take for every short seller to buy back their shares.
Exchange-reported short interest: The official figure published by the exchange or regulator (in the US, FINRA twice a month). It is accurate but delayed, which is the gap the ORTEX daily and intraday estimates fill.

Source: ORTEX. Some figures are limited on the free view; live data and full history are part of ORTEX Advanced.

FIX key data

Latest on FIX

Oct 19, 2026FIX Faces Earnings With a 16% Weekly Sell-Off to Explain
Jul 24, 2026FIX Rebounds 9% Into Earnings as Bulls and Bears Dig In

All FIX news on ORTEX News