Comfort Systems USA Inc

FIXNYSE · USD
1,017.50USD+52.56 (+5.45%)
797

Comfort Systems USA Inc (FIX) Historical Volatility

FIX's 30 day historical volatility is 86.48%, in the 100th percentile of readings over the past year. This is a high percentile, meaning Comfort Systems USA Inc shares have swung far more than usual. FIX's 30 day implied volatility sits at 84.41%, with an IV Rank of 99.60%, leaving IV 2.07 points below historical volatility. This means options are pricing in less movement than the stock has actually delivered, as of Nov 5, 2026.

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Tracking FIX historical volatility helps you see how much Comfort Systems USA Inc's stock price has actually moved, giving you a baseline for whether option premiums look fair, cheap, or expensive. While implied volatility shows what the market expects, FIX's HV, also known as realized volatility, shows what actually happened. Use our scanner to monitor FIX 30 day historical volatility alongside longer lookback windows and spot the moments when realized and implied diverge.

Historical volatility is the annualized standard deviation of a stock's past returns, typically measured over rolling windows like 10, 20, 30, or 60 days. FIX's 30 day historical volatility, or FIX HV, is one of the most widely watched readings because it balances responsiveness with stability. Comparing FIX's HV to its implied volatility reveals the volatility risk premium. When IV sits well above HV, options are pricing in more movement than the stock has actually delivered, giving option sellers an edge. When HV runs hot relative to IV, options are pricing in less movement than the stock has delivered, and buyers may be underpaying for it.

Comfort Systems USA, Inc., together with its subsidiaries, provides mechanical and electrical installation, renovation, maintenance, repair, and replacement services for the mechanical and electrical services industry in the United States. It operates through two segments: Mechanical and Electrical. The company offers heating, ventilation, and air conditioning systems, as well as plumbing, electrical, piping and controls, off-site construction, monitoring, and fire protection. It also involved in the design, engineering, integration, installation, and start-up of mechanical, electrical, and plumbing (MEP) and related systems in new buildings; and renovation, expansion, maintenance, monitoring, repair, and replacement of MEP systems in existing buildings.

Historical Volatility

HV Percentile
100thHV Percentile
High

Historical movement is elevated versus the past year. The stock has been unusually active.

Historical Volatility (30d)86.48%

HV Percentile100th

Implied Volatility (30d)84.41%

IV Rank99.60%

IV Minus HV-2.07%

As of Nov 5, 2026

IV vs HV
Implied Volatility (IV) vs Historical Volatility (HV) over the past month.

As of Nov 5, 2026

IV - HV Difference
Difference between IV and HV over time. Positive values indicate IV > HV.

As of Nov 5, 2026

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