$FIX · COMFORT SYSTEMS USA INC

Comfort Systems USA reported Q3 2026 results with revenue of $3.77B (+54% YoY), net income of $489.0M, and diluted EPS of $13.91 versus $8.25 in Q3 2025. Backlog reached $17.81B, up from $14.06B sequentially and $9.38B year-over-year. Operating cash flow hit $1.01B for the quarter. The company also declared a quarterly dividend of $0.90/share, up from $0.50 a year ago.

Extended-hours trading shows FIX at $1,210.32, down 5.40% from the $1,279.37 regular close, despite revenue growing 54% YoY and EPS nearly doubling. The selloff suggests the market may have priced in even stronger results or is reacting to margin concerns — gross margin was flat YoY at 24.8% despite the massive revenue ramp.

A $45B market-cap company growing revenue 54% and nearly doubling EPS while building an $8B year-over-year backlog increase is exceptional — yet the 5.4% after-hours drop signals the market wanted f

Comfort Systems' $17.81B backlog and 54% revenue growth reflect the extraordinary demand environment in data-center and industrial HVAC/electrical contracting. The flat gross margin at 24.8% despite surging revenue may raise questions about whether scale benefits are materializing as expected.

Backlog of $17.81B may not translate into revenue or profits if projects face cancellations or adjustments. Fixed-price contract bidding risk, labor shortages, and supply chain disruptions could pressure margins on the enormous backlog.