Comfort Systems USA, Inc.
Comfort Systems USA, Inc. (FIX) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · FIX · as of Sep 30, 2025
Ownership Breakdown
909
Institutional Holders
▲ 135 vs Q2
$27.44B
Total Inst. Value
▲ $9.21B vs Q2
35.20M
Shares Outstanding
freeFloat 102.06%
33.31M
13F Shares Held
▼ 682,982 vs Q2
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
FIX largest shareholders · institutional ownership
Q3 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
BLACKROCK, INC. electrical work | 3.98M | 11.27% | 11.27% | $3.28T | Nov 12, 2025 | ▲ 96.4K |
VANGUARD GROUP INC electrical work | 3.68M | 10.44% | 10.44% | $3.04T | Nov 7, 2025 | ▼ 87.9K |
FMR LLC electrical work | 1.89M | 5.36% | 5.36% | $1.56T | Nov 13, 2025 | ▲ 321.5K |
CAPITAL WORLD INVESTORS electrical work | 1.80M | 5.10% | 5.10% | $1.48T | Nov 13, 2025 | ▼ 427.8K |
INVESCO LTD. electrical work | 1.06M | 3.02% | 3.02% | $878.45B | Nov 13, 2025 | ▲ 73.7K |
STATE STREET CORP electrical work | 1.05M | 2.98% | 2.98% | $869.37B | Nov 14, 2025 | ▼ 20.2K |
GEODE CAPITAL MANAGEMENT, LLC electrical work | 853.5K | 2.42% | 2.42% | $704.36B | Nov 12, 2025 | ▲ 31.6K |
AQR CAPITAL MANAGEMENT LLC electrical work | 835.6K | 2.37% | 2.37% | $678.47B | Nov 14, 2025 | ▲ 53.1K |
WESTFIELD CAPITAL MANAGEMENT CO LP electrical work | 833.2K | 2.36% | 2.36% | $687.54B | Nov 12, 2025 | ▼ 103.2K |
JPMORGAN CHASE & CO electrical work | 734.5K | 2.08% | 2.08% | $606.12B | Nov 26, 2025 | ▲ 197.6K |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q3 2025 vs prior quarter
Q3 2025
23
Increased
+1.60M shares2
New Positions
first time holders25
Decreased
−1.56M shares0
Sold Out
fully exitedNet shares change (top 50)
+33.7K
+1.60M / −1.56M
Net new holders
+0
2 new / 0 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
FIX insider trading · insider activity
Source: SEC Form 4
Insiders have been primarily selling shares recently. Selling may be driven by pre-scheduled Rule 10b5-1 plans rather than negative sentiment.
9
Buy transactions
30
Sell transactions
0.30
Buy/Sell ratio
$0M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
Hardy Rhoman J director | May 27, 2026 | Sale | 342 | $1900.08 | $649.8K | 1.9K | Form 4 ↗ |
MYERS FRANKLIN director | May 21, 2026 | Gift | 273 | — | — | 68.8K | Form 4 ↗ |
ANDERSON DARCY director | May 18, 2026 | Award | 105 | — | — | 18.1K | Form 4 ↗ |
MYERS FRANKLIN director | May 18, 2026 | Award | 105 | — | — | 69.1K | Form 4 ↗ |
BULLS HERMAN E director | May 18, 2026 | Award | 105 | — | — | 29.9K | Form 4 ↗ |
Hardy Rhoman J director | May 18, 2026 | Award | 105 | — | — | 2.2K | Form 4 ↗ |
Kapoor Gaurav director | May 18, 2026 | Award | 105 | — | — | 832 | Form 4 ↗ |
Mercado, Pablo G. director | May 18, 2026 | Award | 105 | — | — | 3.1K | Form 4 ↗ |
SANDBROOK WILLIAM J director | May 18, 2026 | Award | 105 | — | — | 7.8K | Form 4 ↗ |
Skidmore Constance Ellen director | May 18, 2026 | Award | 105 | — | — | 12.7K | Form 4 ↗ |
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
Comfort Systems USA, Inc. (FIX) is primarily owned by institutional investors, who hold approximately 94.6% of total shares outstanding. Company insiders own approximately 0.00%, while retail and public investors account for the remaining 7.43%.
The largest institutional shareholder of Comfort Systems USA, Inc. is BLACKROCK, INC., holding approximately 3.98 million shares — equal to 11.27% of outstanding shares — as of September 30, 2025.
A total of 909 institutional investors currently hold FIX stock, with a combined institutional value of approximately $27.44 billion as of the most recent 13F filing period.
Frequently asked questions
FIX ownershipComfort Systems USA, Inc. (FIX) is primarily owned by institutional investors, who hold approximately 94.6% of shares. The largest shareholder is BLACKROCK, INC. with a 11.27% stake. Company insiders hold 0.00%. Data sourced from SEC Form 13F as of September 30, 2025.