I Bought FIX at $380. It's Up 330%. Here's Why I'm Still Not Selling

Key Takeaways

• FIX's backlog doubled to $11.94B, signaling strong future revenue
• Q4 2025 gross margin hit 25%, unprecedented for HVAC sector
• Electrician labor shortage creates a bottleneck for AI data‑center builds
• Inclusion in S&P 500 forced index funds to buy FIX shares
• Institutional buying continues; Allspring added $65M position in 2025

Pulse Analysis

The surge in AI‑driven data‑center construction has exposed a hidden but vital segment of the economy: mechanical, electrical and plumbing (MEP) contractors. While investors chased GPU makers and power‑supply firms, the real bottleneck has shifted to the skilled labor needed to wire and cool massive facilities. Companies like Comfort Systems USA (FIX) have leveraged this gap, positioning themselves as the only qualified crews for high‑value projects such as Texas’ 300 MW data centers. This structural demand shift is prompting a re‑rating of traditionally low‑margin industrial firms.

FIX’s financials underscore why the market is beginning to correct its earlier undervaluation. In Q4 2025 the firm reported $2.65 billion in quarterly revenue—a 41.7% year‑over‑year jump—and a full‑year revenue of $9.10 billion, up nearly 30%. More striking, its backlog doubled to $11.94 billion, providing a concrete revenue floor for 2027. Margins surged to a historic 25%, and free cash flow topped $1.04 billion, allowing the company to boost its balance sheet and initiate share buybacks. Inclusion in the S&P 500 further accelerated buying from index funds, compounding the price appreciation.

Looking ahead, the labor shortage of licensed electricians—estimated at a need for 300,000 new workers over the next decade—creates a durable moat for firms that can scale modular capacity. FIX plans to expand its modular footprint to 4 million square feet by 2026, while peers are racing to replicate the model. Institutional confidence remains high, with Allspring adding a $65 million stake and analysts raising price targets. For investors, the key is to identify other MEP contractors that mirror FIX’s backlog dynamics and margin expansion, positioning themselves to benefit from the ongoing AI infrastructure supercycle.