Comfort Systems USA (FIX) Stock After Hours Today (Dec. 22, 2025): S&P 500 Inclusion, Leadership Shift, and What to Watch Before Tuesday’s Open
Comfort Systems USA, Inc. (NYSE: FIX) is ending Monday’s session firmly in the spotlight—coming off a powerful 2025 run, completing its long-telegraphed move into the S&P 500, and heading into a data-heavy Tuesday morning for U.S. markets. After the closing bell on Monday, December 22, 2025, FIX traded around $950.79 in after-hours quotes, up roughly 1% versus the prior close as of about 5:31 p.m. ET. Below is what matters most tonight—what moved the narrative today, what fresh coverage and analysis hit the tape, and what to keep on your radar before the market opens Tuesday (Dec. 23). FIX stock