FIX (Comfort Systems USA, Inc.): Themes, ETFs, and Basket Ideas
FIX is the ticker for Comfort Systems USA, Inc.. This page covers what the company does, where it's heading, its approximate earnings and valuation, key competitors, the themes it belongs to, the ETFs that hold it, and similar stocks worth looking at.
What does Comfort Systems USA, Inc. do?
Comfort Systems USA is one of the largest mechanical, electrical, and plumbing (MEP) construction service providers in the United States. The company provides design, installation, and service of heating, ventilation, air conditioning (HVAC), plumbing, electrical, and piping systems for commercial, industrial, and institutional customers. End markets include data centers, semiconductor fabs, life sciences facilities, healthcare buildings, schools, and various other non-residential construction.
The data center end market in particular has become a significant share of revenue and a major growth driver. Comfort Systems' specialty contracting expertise (mechanical and electrical for high-density compute environments) aligns with the surge in hyperscaler AI data center construction. The company operates through a portfolio of operating companies that retain local brand identity and customer relationships. Founded in 1997, headquartered in Houston, Texas. Brian Lane has been CEO since 2012.
Where is Comfort Systems USA, Inc. heading?
1. Data center construction.
AI-driven hyperscaler capex is the largest single growth driver. Comfort Systems is one of the largest US MEP contractors with specialty data center expertise. Backlog from data center customers has grown materially. The data center end market is now a substantial share of revenue.
2. Semiconductor fab buildouts.
TSMC Arizona, Intel Ohio, Samsung Texas, and Micron New York fab construction all require MEP contracting at massive scale. Comfort Systems has been winning fab work. Each fab buildout is multi-year and high-value.
3. Industrial reshoring.
Broader industrial reshoring (battery facilities, EV manufacturing, pharmaceutical capacity) drives MEP construction demand. End market is diverse and growing across multiple sectors.
4. Acquisition strategy.
Comfort Systems has been an active acquirer of regional MEP contractors. The acquisition strategy extends geographic reach, adds capabilities, and consolidates a structurally fragmented industry. Cash generation has supported acquisition pace.
Risks worth tracking: Construction cyclicality. Hyperscaler AI capex concentration creates revenue concentration. Labor availability (skilled trades) constrains capacity to capture demand. Margin pressure during labor inflation periods.
Earnings and valuation (approximate, early 2026)
A simple financial snapshot. These are approximations and refresh quarterly; for current figures see Comfort Systems USA, Inc.'s investor relations page or your broker.
- Revenue (TTM): ~$7 billion
- Operating margin: ~11% (improving with mix)
- Net income (TTM): ~$600 million
- EPS (TTM): ~$17.00
- P/E (TTM): ~25x
- Price to sales: ~3x
- Dividend yield: ~0.4%
- Free cash flow: ~$500 million annually
- Backlog: Multi-year visibility on data center work
Comfort Systems trades at a premium to traditional construction contractors, reflecting data center end-market exposure and backlog visibility. The multiple has expanded with the AI data center thesis.
Themes FIX belongs to
These are the investment theses FIX naturally fits into. Each links to a full theme guide listing every other stock that belongs and the ETFs commonly used as a passive proxy.
FIX's competitors
Mechanical, electrical, plumbing contractors
EMCOR Group is the closest direct competitor and the other publicly listed major MEP contractor. Quanta Services (PWR) competes in electrical infrastructure, particularly transmission and distribution. MasTec competes in various infrastructure construction. Many large MEP contractors are privately held; the industry is structurally fragmented.
Data center specialty contractors
Various specialty data center MEP firms compete for hyperscaler work. The combination of scale (to handle billion-dollar buildouts) and specialty expertise creates a meaningful competitive moat for the few firms that can deliver at hyperscaler scale.
Similar stocks
Other names that show up alongside FIX in the same themes. Worth a look if you're thinking about diversification within a single thesis rather than concentration on one ticker.
Also fits Data center power and cooling. Largest specialty electrical infrastructure contractor in North America. Transmission and substation work for AI-driven utility load growth.
Also fits Data center power and cooling. Large MEP contractor winning hyperscaler data center buildouts alongside Comfort Systems.
Also fits Data center power and cooling. E-Infrastructure Solutions specializes in data center site development (earthwork, foundations, utilities) for hyperscalers.
Also fits Data center power and cooling. Distributes the wire, cable, switchgear, busways, and datacom infrastructure that data center construction consumes at scale.
Using FIX in a Walnut basket
The most useful question to ask about a single stock is rarely “will it go up?”. It's “does this fit a thesis I actually believe in, and how do I size it alongside other stocks that fit the same thesis?” That's what Walnut is built for.
Open the AI assistant on Walnut and describe a thesis (for example: “the AI infrastructure buildout”, “dividend growth large-caps”, “global semiconductors”) where FIX would naturally fit. The AI proposes 5 to 6 constituents with target weights, you review, and you can fund the basket through your broker once you're ready.
Build a basket around FIX with Walnut
Use Comfort Systems USA, Inc. as one constituent in a thematic basket Walnut's AI helps you assemble. Describe a thesis you believe in, the AI proposes the holdings and weights, and you approve before any broker order.
FAQ
What is Comfort Systems USA's ticker symbol?
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FIX, listed on NYSE. Officially Comfort Systems USA, Inc. Founded 1997, headquartered in Houston, Texas. Trades during US market hours, available at every major US brokerage.
Who are Comfort Systems' competitors?
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EMCOR Group is the closest direct competitor and the other publicly listed major MEP contractor. Quanta Services competes in electrical infrastructure. MasTec competes in various infrastructure construction. Many large MEP contractors are privately held; the industry is structurally fragmented across regions.
Is Comfort Systems an AI infrastructure stock?
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Yes. The data center end market is now a substantial share of Comfort Systems' revenue and the largest growth driver. AI-driven hyperscaler capex on new data center buildouts directly drives MEP contracting demand. The company has specialty expertise in high-density compute environments.
What is Comfort Systems' P/E ratio?
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Approximately 25x trailing twelve months as of early 2026. Premium to the S&P 500 average (~22x) and to traditional construction contractors, reflecting data center end-market exposure and the backlog visibility from hyperscaler AI capex.
What does Comfort Systems do?
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Comfort Systems provides design, installation, and service of mechanical, electrical, and plumbing systems for commercial, industrial, and institutional buildings. End markets include data centers, semiconductor fabs, life sciences, healthcare, education, and various other non-residential construction. Data center work has become a substantial share of revenue.
Who owns the most Comfort Systems stock?
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Major institutional holders include Vanguard (~9%), BlackRock (~7%), and various AI-infrastructure-themed and industrials-focused funds. Insider ownership is modest. Comfort Systems has been broadly held in funds that play the AI data center theme through infrastructure picks.
Which ETFs have the most Comfort Systems exposure?
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PAVE (Global X US Infrastructure Development) holds FIX at meaningful weight. XLI (Industrial Select Sector SPDR) holds FIX at smaller weight given its larger universe. Data center and AI infrastructure-themed ETFs (DTCR, AIQ) hold FIX at higher concentrations. VOO holds FIX at ~0.1%. Small/mid-cap industrial ETFs hold FIX as part of broader universes.
Which thematic baskets typically include Comfort Systems?
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Two themes on Walnut. Data center power and cooling (MEP contracting with specialty data center expertise; backlog from hyperscaler customers has grown materially) and Infrastructure and reshoring (MEP contractor across non-residential construction including fabs and reshored manufacturing). FIX is a common AI infrastructure satellite position.
Is Comfort Systems in the S&P 500?
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Yes. FIX was added to the S&P 500 in 2024 after meaningful market cap growth driven by AI data center backlog. The index inclusion broadened passive ownership materially.
What is Comfort Systems' market cap?
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Approximately $15 billion as of early 2026. Market cap has grown several multiples since 2022 on AI data center backlog visibility. FIX is now among the larger US specialty contractors by market cap.
Does Comfort Systems pay a dividend?
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Yes. FIX yields approximately 0.4% as of early 2026, paid quarterly. The dividend is modest as a percentage of share price given the rapid appreciation; the dollar dividend has grown but slower than share price. Capital allocation has prioritized acquisition growth alongside dividend growth.
Why are MEP contractors important for AI?
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Every AI data center requires extensive mechanical (HVAC, cooling distribution), electrical (power distribution, switchgear), and plumbing (liquid cooling, water systems) infrastructure. MEP contractors physically install and integrate this infrastructure. Comfort Systems has specialty data center expertise and has won meaningful hyperscaler work. The shortage of qualified MEP contractors at hyperscaler scale is a structural constraint on data center buildout pace.
How does Comfort Systems compare to EMCOR?
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Both are major US MEP contractors with similar business models. Comfort Systems has been more concentrated in data center and specialty industrial work; EMCOR has broader exposure including industrial services and government. EMCOR is somewhat larger. Returns over multi-year windows have been close; FIX has typically outperformed in the strongest AI-driven legs because of higher data center concentration.
Should I own Comfort Systems directly or through PAVE?
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Both common. Direct FIX gives concentrated MEP contracting exposure with full leverage to the AI data center buildout. PAVE includes FIX along with broader infrastructure. Many Walnut users hold FIX directly in AI infrastructure or data center power baskets, given the more concentrated AI data center exposure than broad infrastructure ETFs provide.
Walnut is informational, not investment advice. Financial figures on this page are approximations; always verify current numbers with Comfort Systems USA, Inc.'s investor relations page or your broker before making investment decisions.