What is the 13F Pro Quality Score for FIX?

13F Pro ranks COMFORT SYSTEMS USA INC (FIX) on the 13F Pro Quality Score, a 0–100 composite of 32 fundamental signals including return on invested capital, free cash flow consistency, balance-sheet strength, earnings quality, growth durability, and valuation discipline. The score refreshes after each 10-K and 10-Q filing on SEC EDGAR. View FIX's current score at https://13fpro.ai/research/FIX (free sign-up required for the full ranking).

Where does 13F Pro source FIX data?

All COMFORT SYSTEMS USA INC fundamentals and ownership data come directly from SEC EDGAR. COMFORT SYSTEMS USA INC files with the SEC under CIK 1035983. 13F Pro ingests XBRL financial facts from 10-K and 10-Q filings, Form 13F-HR institutional holdings, and Form 4 insider transactions, with no third-party rewrites or estimates.

What sector is FIX in?

COMFORT SYSTEMS USA INC (FIX) is classified in the Industrials sector. 13F Pro publishes sector-level fund flow analysis and quality leaders at https://13fpro.ai/research/sector/industrials.

How often is FIX research updated on 13F Pro?

FIX's fundamentals refresh within hours of each new 10-K or 10-Q filing on SEC EDGAR. Institutional ownership updates after each quarterly 13F filing window. Insider transactions update after each Form 4 filing. The 13F Pro Quality Score recalculates after every fundamentals refresh.

COMFORT SYSTEMS USA INC(FIX)Stock Analysis

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13F Pro Quality Score

79.5/100

Rank #52 of 2,879 stocksTOP 5%

View Industrials peers →

Rankings refresh quarterly once 80% of peers have filed (~45 days after quarter-end). Next update: ~Aug 14, 2026.

Revenue Growth

88.0/100

Profitability

77.6/100

Balance Sheet

94.4/100

Earnings Quality

90.6/100

Free Cash Flow

62.0/100

Institutional Flow

24.8/100

Revenue Scale

86.1/100

Dilution Risk

84.6/100

FIX Stock Analysis & AI Quality Score

AI stock analysis and institutional research for COMFORT SYSTEMS USA INC (FIX), a Industrials sector company. 13F Pro's AI-powered ranking engine scores FIX at 79.5/100 on a 32-signal composite quality model, placing it at rank #52 of 2,879 stocks — the top 5% of the AI-ranked universe. FIX scores in the top quartile across balance sheet strength (94.4), earnings quality (90.6), revenue growth (88.0). Areas of concern include institutional flow (24.8), which score below median versus the broader universe. Based on the latest XBRL financial filings (Q1 2026), COMFORT SYSTEMS USA INC reports quarterly revenue of $2.9B, net income of $370.4M, an operating margin of 17.0%. Top institutional holders of FIX by reported 13-F value include BlackRock,, VANGUARD CAPITAL MANAGEMENT, VANGUARD PORTFOLIO MANAGEMENT, based on the most recent SEC filings. FIX trades on the NYSE exchange and files with the SEC under CIK 1035983. 13F Pro's AI research platform runs 10 specialized AI analysts — value, growth, momentum, macro, and activist specialists — that debate FIX daily and publish AI-generated analysis with cited SEC sources. The platform aggregates historical XBRL financial facts, 10-Q and 10-K filings, insider Form 4 transactions, and institutional 13-F holdings for COMFORT SYSTEMS USA INC directly from SEC EDGAR. COMFORT SYSTEMS USA INC's 13F Pro composite quality score has ranged between 8 and 82 since 2021, currently 79.5 — an improving long-term trajectory across 56 quarterly and live scoring snapshots.

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Fun facts about COMFORT SYSTEMS USA INC

Quirks, history, and lore behind FIX — the kind of stuff that makes a stock memorable.

1
The Basics
A U.S. industrials company · mid-cap · listed on NYSE · headquartered in Texas.
2
The Numbers
Annual revenue in the range of $5–6 billion, built almost entirely through acquiring smaller contractors across dozens of local markets.
3
The History
Founded in the 1990s as a roll-up play, it grew by gobbling up independent mechanical and electrical contractors at a pace that would make a private-equity firm blush.
4
The Secret
It doesn't build skyscrapers or lay highways — it handles what goes inside the building: HVAC, plumbing, electrical, and fire protection systems.
5
The Lore
Its stock ticker is FIX — which is either the most on-the-nose symbol on Wall Street or a confession about what your air conditioner needs every August.
6
The Giveaway
If a big commercial building in the U.S. is heated, cooled, or ventilated, there's a decent chance this Houston-based mechanical contractor — whose name literally promises coziness — did the work.

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What's Driving FIX's Business? Latest 10-Q Breakdown

AI-extracted from COMFORT SYSTEMS USA INC's 10-Q filed 2026-04-23 — Q1 2026 (quarter ended March 31, 2026). Every figure is machine-verified against the filing text on SEC EDGAR.

Revenue surged 56.5% YoY to $2.87B as strong technology/manufacturing demand and acquisitions drove growth; net income more than doubled to $370M.

Largest Expense Items

Selling, General and Administrative$269.0M+38.0% YoY

Same-store SG&A (excl. amortization) up 34.4% due to higher revenue and increased compensation/headcount costs ($54M); leverage improved SG&A as % of revenue to 9.4% from 10.6%.

Margins: Gross profit margin expanded to 26.3% from 22.0% YoY, driven by 51.5% same-store revenue growth, improved execution across operations, and $43.1M in favorable project developments. Operating income margin improved significantly to 17.0% from 11.4% YoY on strong leverage.

Watch Items from the Filing

Technology sector revenue concentration: $1.62B (56.4% of Q1 revenue) vs. $677.6M (37.0%) YoY; includes significant data center exposure which is driving backlog growth.
Backlog reached $12.45B (+80.8% YoY), 94% from projects ≥$2M; company expects 65-75% recognized over next 12 months, supporting near-term revenue visibility.
Operating leverage from same-store revenue growth of 51.5% significantly outpaced SG&A growth of 34.4%, indicating strong incremental margins but sustainability dependent on labor availability and cost inflation.
Company self-insured for workers' compensation, auto/general liability with high deductibles; $37.9M self-insurance accrual as of Q1 2026; significant exposure to long-tail claims.
Surety bond capacity available; 10-20% of business historically requires bonds; loss of surety access would restrict revenue growth and require alternative collateral arrangements.

AI-extracted and verified against SEC EDGAR filing text. Not investment advice.

Read the full 10-Q on SEC EDGAR →Share on X

Revenue

Q1 2026

$2.9B

Net Income

Q1 2026

$370.4M

Free Cash Flow

Q1 2026

$241.4M

Operating Margin

Q1 2026

17.0%

D/E Ratio

Q1 2026

0.01

Revenue & Net Income

Earnings Per Share

Key Financials Over Time

Export Financial Table · Pro+

Revenue

+29.5% YoY

$9.10BFY 2025

FY20 $2.86BFY22 $4.14BFY24 $7.03BFY25 $9.10B

Net Income

+95.7% YoY

$1.02BFY 2025

FY20 $150.1MFY22 $245.9MFY24 $522.4MFY25 $1.02B

Operating Income

+75.4% YoY

$1.31BFY 2025

FY20 $190.7MFY22 $253.8MFY24 $749.4MFY25 $1.31B

EPS (Diluted)

+97.8% YoY

$28.88FY 2025

FY20 $4.09FY22 $6.82FY24 $14.60FY25 $28.88

Total Assets

+36.7% YoY

$6.44BFY 2025

FY20 $1.76BFY22 $2.60BFY24 $4.71BFY25 $6.44B

Total Debt

+103.5% YoY

$151.4MFY 2025

FY20 $236.0MFY22 $256.2MFY24 $74.4MFY25 $151.4M

Op. Cash Flow

+39.7% YoY

$1.19BFY 2025

FY20 $286.5MFY22 $301.5MFY24 $849.1MFY25 $1.19B

Metric	FY 2025	FY 2024	FY 2022	FY 2020	FY 2019	FY 2017
Revenue	$9.10B +29.5%	$7.03B +69.7%	$4.14B +44.9%	$2.86B +9.2%	$2.62B +46.3%	$1.79B
Net Income	$1.02B +95.7%	$522.4M +112.4%	$245.9M +63.8%	$150.1M +31.3%	$114.3M +106.8%	$55.3M
Operating Income	$1.31B +75.4%	$749.4M +195.2%	$253.8M +33.1%	$190.7M +16.5%	$163.6M +64.9%	$99.3M
EPS (Diluted)	$28.88 +97.8%	$14.60 +114.1%	$6.82 +66.7%	$4.09 +32.8%	$3.08 +109.5%	$1.47
Total Assets	$6.44B +36.7%	$4.71B +81.4%	$2.60B +47.8%	$1.76B +16.8%	$1.51B +70.8%	$881.1M
Total Debt	$151.4M +103.5%	$74.4M -71.0%	$256.2M +8.6%	$236.0M +4.2%	$226.5M +274.1%	$60.5M
Operating Cash Flow	$1.19B +39.7%	$849.1M +181.6%	$301.5M +5.2%	$286.5M +101.7%	$142.0M +24.5%	$114.1M

AI Insight: FIX Financial Trends

Comfort Systems USA delivered explosive margin and profit expansion, with Q1 2026 operating income of $486M on $2,865M revenue dwarfing Q2 2024 levels by 163% and 58% respectively.

• Revenue surged 58% from $1,810M in Q2 2024 to $2,865M in Q1 2026, accelerating sharply through 2025.

• Operating margin expanded from 10.2% in Q2 2024 to 17.0% in Q1 2026, reflecting sustained operating leverage.

• Net income nearly tripled from $134M in Q2 2024 to $370M in Q1 2026, with sequential gains in every period.

• Total debt fell to $39M in Q1 2026 versus $109M in Q2 2024, while equity grew from $1,482M to $2,815M.

⚠ Operating cash flow turned negative at -$88M in Q1 2025 before recovering; working capital seasonality bears monitoring.

⚠ Total debt ticked up from $72M in Q1 2025 to $151M in Q4 2025 before dropping to $39M — debt volatility warrants attention.

⚠ Revenue growth rate is accelerating rapidly; sustaining backlog and execution at this scale is a key operational risk.

AI Insight: FIX Ratio Trends

Comfort Systems' operating margin hit 17.0% in Q1 2026 — nearly double Q2 2024's 10.2% — while ROIC surged to 68.1%, signaling exceptional capital efficiency.

• Operating margin expanded from 10.2% in Q2 2024 to 17.0% in Q1 2026, a ~680bp improvement across seven quarters.

• ROIC climbed from 46.4% in Q2 2024 to 68.1% in Q1 2026, reflecting consistently stronger returns on invested capital.

• ROA rose from 12.7% in Q2 2024 to 21.3% in Q1 2026, alongside net profit margin expanding from 7.4% to 12.9%.

• Leverage remains essentially negligible: D/E fell to 0.01 in Q1 2026, the lowest in the observed period.

⚠ ROE dipped from 54.0% in Q4 2025 to 52.6% in Q1 2026 — monitor whether this is seasonal softness or a genuine inflection.

⚠ D/E ticked up to 0.06 in Q3–Q4 2025 before dropping back to 0.01 in Q1 2026; watch for debt re-accumulation tied to acquisitions.

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Available Research

13F Pro tracks comprehensive data for COMFORT SYSTEMS USA INC including:

SEC EDGAR filings (10-K, 10-Q, 8-K)

XBRL financial facts (revenue, EPS, margins)

Insider transactions (Form 4)

Institutional 13F holdings

Quality rankings (32 signals)

AI analyst debates & daily meetings

Historical financial trends

Peer comparison & sector analysis

Top Institutional Holders of FIX

BlackRock, Inc.
$4.8B3,512,927 sh
VANGUARD CAPITAL MANAGEMENT LLC
$3.2B2,285,949 sh
VANGUARD PORTFOLIO MANAGEMENT LLC
$2.6B1,881,184 sh
STATE STREET CORP
$2.0B1,471,879 sh
FMR LLC
$2.0B1,449,517 sh
GEODE CAPITAL MANAGEMENT, LLC
$1.7B1,238,619 sh
AQR CAPITAL MANAGEMENT LLC
$1.5B1,116,230 sh
Capital World Investors
$1.2B865,780 sh
WESTFIELD CAPITAL MANAGEMENT CO LP
$856.2M620,915 sh
Invesco Ltd.
$836.5M606,580 sh

Fund	Value	Shares
BlackRock, Inc.	$4.8B	3,512,927
VANGUARD CAPITAL MANAGEMENT LLC	$3.2B	2,285,949
VANGUARD PORTFOLIO MANAGEMENT LLC	$2.6B	1,881,184
STATE STREET CORP	$2.0B	1,471,879
FMR LLC	$2.0B	1,449,517
GEODE CAPITAL MANAGEMENT, LLC	$1.7B	1,238,619
AQR CAPITAL MANAGEMENT LLC	$1.5B	1,116,230
Capital World Investors	$1.2B	865,780
WESTFIELD CAPITAL MANAGEMENT CO LP	$856.2M	620,915
Invesco Ltd.	$836.5M	606,580

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Is FIX a good stock to buy?

13F Pro's AI-powered analysis of COMFORT SYSTEMS USA INC (FIX) draws on SEC EDGAR-sourced fundamentals, institutional 13F holdings, and insider Form 4 transactions in the Industrials sector (listed on NYSE). The 32-signal AI Quality Score, current rank, and full bull/bear verdict for FIX are available on the FIX stock profile dashboard — with the same data, AI insights, ratios, and institutional activity refreshed after every 10-K, 10-Q, 13F, and Form 4 filing.

Which hedge funds own FIX?

Institutional investors are required to disclose their holdings quarterly via SEC Form 13F. 13F Pro aggregates these filings to show which hedge funds, mutual funds, and asset managers are buying or selling FIX. Combined with insider transaction data from Form 4 filings and AI-powered analysis from 10 specialized research agents, 13F Pro provides a comprehensive view of COMFORT SYSTEMS USA INC's investment landscape.