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FIX −15.7%: one of its biggest daily moves this year. COMFORT SYSTEMS USA INC moved 14.5 points less than its sector, on 2.6× its usual volume.

2026-11-04 · FIX

FIX −15.7%: one of its biggest daily moves this year

COMFORT SYSTEMS USA INC moved 14.5 points less than its sector, on 2.6× its usual volume.

The story in plain words

Wednesday, November 4, 2026. FIX −15.7%: one of its biggest daily moves this year. COMFORT SYSTEMS USA INC moved 14.5 points less than its sector, on 2.6× its usual volume.

What the data shows for Comfort Systems USA (FIX): FIX −15.7% today. Its sector fund (XLI) −1.2% today. S&P 500 (SPY) +1.7% today.

Worked out from that data: 14.5 points less than its sector. Volume 2.6× its 20-day average. Its biggest daily move in the past 250 trading days. After the 5 most similar FIX days since Nov 17, 2021, the stock was higher 5 days later 5 of 5 times (History, not a forecast).

Possible contributors. These line up in time with the move; they are not confirmed causes: News: “Data Center Stocks Just Plunged After the Midterms. Is It Time to Buy the Dip?” (Published around the move. Timing only, not a confirmed cause). News: “Caterpillar Sinks 6% as Democrats Win Congress: “Caught Up in This AI Trade”” (Published around the move. Timing only, not a confirmed cause).

About the company: Comfort Systems USA trades as FIX and is part of the S&P 500, in the Industrials sector (Construction & Engineering), headquartered in Houston, Texas, founded in 1997.

This is one of CookieStocks’ daily stock stories about unusually large one-day price moves in S&P 500 stocks, measured against each stock’s own history, its sector and its usual volume. Stories are found automatically each trading day from market data and SEC filings, and every claim is labelled as observed, calculated or a possible contributor. Statistics only, not investment advice.

Prove it

Every claim on the graphic, labelled: observed (straight from the data), calculated (worked out from it), or possible contributor (lines up in time, not a confirmed cause).

  • OBSERVED
    FIX −15.7% todayNov 4, 2026, 4:35 PM ET
  • OBSERVED
    Its sector fund (XLI) −1.2% todayNov 4, 2026, 4:35 PM ET
  • CALCULATED
    14.5 points less than its sectorHow: stock return − sector fund return · Nov 4, 2026, 4:35 PM ET
  • OBSERVED
    S&P 500 (SPY) +1.7% todayNov 4, 2026, 4:35 PM ET
  • CALCULATED
    Volume 2.6× its 20-day averageHow: today’s volume ÷ average of the last 20 days · Nov 4, 2026, 4:35 PM ET
  • CALCULATED
    Its biggest daily move in the past 250 trading daysHow: share of past daily moves smaller in size · Nov 4, 2026, 4:35 PM ET
  • POSSIBLE CONTRIBUTOR
    News: “Data Center Stocks Just Plunged After the Midterms. Is It Time to Buy the Dip?”Published around the move. Timing only, not a confirmed cause. · Nov 4, 2026, 11:48 AM ET
  • POSSIBLE CONTRIBUTOR
    News: “Caterpillar Sinks 6% as Democrats Win Congress: “Caught Up in This AI Trade””Published around the move. Timing only, not a confirmed cause. · Nov 4, 2026, 11:45 AM ET
  • CALCULATED
    After the 5 most similar FIX days since Nov 17, 2021, the stock was higher 5 days later 5 of 5 timesHistory, not a forecast. · How: same-company days with a move of similar size and direction

Comfort Systems USA (FIX) financials and filings →

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Statistics only, not investment advice. Past moves don’t predict future ones. Data as of Nov 4, 2026, 4:35 PM ET.