Comfort Systems USA Is a $1,600 Stock Almost Nobody Owns. Here's Why It Keeps Crushing the Market.

Comfort Systems USA (FIX) has climbed 77% this year and 871% over three years, and its $14.06 billion backlog now exceeds projected 2026 revenue of $13 billion.

That backlog-to-revenue relationship is the core of the bull case. The contractor already has more work booked than analysts expect it to bill next year, which gives its revenue forecast a visible foundation rather than a speculative one.

The source of that demand is concentrated. Technology and data center work makes up 58% of FIX revenue, tying the stock directly to the AI infrastructure build-out and to continued spending by hyperscalers. The mechanical and electrical services contractor sits in the construction chain for that investment, and the 871% three-year run shows how heavily the market has rewarded that positioning.

Beyond installation, future service and maintenance contracts add a recurring layer to the growth outlook. Interpretation: that follow-on work could help smooth the revenue profile if new build activity ever cools, though the supplied evidence does not quantify that contribution.

At a share price near $1,600, FIX trades as a high-priced, thinly held name, and the 58% data center concentration cuts both ways. It amplifies gains when AI spending accelerates and magnifies risk if it slows.