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. 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.