FIX

COMFORT SYSTEMS USA INC

Ticker: FIXIndustrialsConstructionS&P 500
HQ HOUSTON, TXCIK 1035983FY end 12-31Book / share $91.26Shares 35M
Revenue (FY)
$9.10B+29.52%
TTM $11.23B
Op. margin
14.44%+3.78%
TTM 16.47%
Net income
$1.02B+95.73%
TTM $1.43B
Operating cash
$1.19B+39.73%
TTM $2.55B
Free cash flow
$1.03B+39.77%
TTM $2.16B
Return on equity
41.76%+11.11%
TTM 44.58%
Debt / equity
0.06+0.02%
TTM 0.02
Shares outstanding
35.4M-1.01%
TTM 35.3M

The business

Comfort Systems USA, Inc. (NYSE: CSU) operates as a leading provider of mechanical and electrical contracting services across North America. The company's website is www.comfortsystemsusa.com.

The company delivers comprehensive HVAC, plumbing, electrical, and building automation solutions to commercial, industrial, and residential customers. Comfort Systems operates through a decentralized network of regional service companies that maintain strong local market presence while benefiting from the parent company's operational expertise, financial resources, and purchasing power. This structure allows the company to combine entrepreneurial agility with enterprise-scale capabilities.

The business serves diverse end markets including healthcare facilities, educational institutions, data centers, manufacturing plants, hospitality venues, and commercial office buildings. Comfort Systems generates revenue through both service and maintenance contracts, which provide recurring revenue streams, as well as new construction and retrofit projects. The company's service-oriented model emphasizes long-term customer relationships and recurring business, creating revenue stability alongside project-based opportunities.

Comfort Systems maintains an extensive geographic footprint across the United States and Canada, with operations in numerous metropolitan markets. The company employs thousands of skilled technicians, engineers, and support personnel who deliver services across its service territories. The decentralized operating model enables rapid response to local market conditions while maintaining consistent quality standards and safety protocols.

The company has built competitive advantages through its technical expertise, established customer relationships, operational efficiency, and ability to execute complex projects. Comfort Systems' scale provides procurement advantages and access to capital for growth investments, while its regional structure preserves the entrepreneurial culture and local market knowledge that drive customer satisfaction and employee retention.

The credit agreement detailed in this filing represents the company's primary financing facility, providing liquidity for working capital, acquisitions, and general corporate purposes. The facility structure reflects Comfort Systems' established market position and access to institutional capital markets.

Sector
Industrials
Industry
Construction
HQ
HOUSTON, TX
FY end
12-31
CIK
1035983
SIC
1731
Financial performance · annual
20132025
$-1.12B$2.25B$5.61B$8.98B$12.35B2013201420152016201720182019202020212022202320242025TTMTTMTTM

Ownership

Who holds COMFORT SYSTEMS USA INC — across funds, superinvestors and bonds · N-PORT 2026Q2 · 13F 2026-06-30

982
funds hold it
1 of 35
superinvestors hold it
$29.15B
fund-held value
43.0%
of shares held by funds

Top fund holders

Fund% of fundValue
VANGUARD TOTAL STOCK MARKET INDEX FUND
VTI · VANGUARD INDEX FUNDS
0.10%$2.21B
VANGUARD 500 INDEX FUND
VOO · VANGUARD INDEX FUNDS
0.11%$1.81B
VANGUARD MID-CAP INDEX FUND
VO · VANGUARD INDEX FUNDS
0.67%$1.51B
iShares Core S&P 500 ETF
IVV · iShares Trust
0.11%$956.97M
SMALLCAP World Fund Inc
SMCWX
0.93%$883.31M

Superinvestors in COMFORT SYSTEMS USA INC

Tom GaynerUNCHANGED
Markel Group (Markel-Gayner)
0.2%

Share of each manager's reported 13F portfolio.

Fund ownership counts N-PORT filers only, so it is a floor rather than a census — pensions, insurers and direct holders are not visible here, and the remainder is not “held by individuals”.

Fund ownership is a subset of institutional 13F ownership — the two describe overlapping populations and must not be added together.

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