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Comfort Systems USA FIX

US equityMarket cap rank #274Engineering & Construction
$1,663.15
+$37.25 (+2.29%)
Market open · Sep 24, 1:10 pm ET
After hours $1,629.00 +0.19%
Open$1,580.26
Prev close$1,625.90
Day range$1,570.00 – $1,663.15
Volume102.1K
Market cap$58.53B
P/E (TTM)40.9
Dividend yield0.16%

Ownership & positioning

Who holds it, who is betting against it, and where the big money is moving

Institutional ownership94.8%-0.21 pts vs. prior quarter
Institutions holding1,574-7 vs. prior quarter
Insider trades (recent)15 buys / 10 sellsNet buying
Short interest2.59% of floatDays to cover 2.2 · as of 31 Aug 2026
Short-sale volume share15.6%5-day average of daily volume

Short-sale volume as % of daily volume

8%12%17%21%Aug '26Sep '26Sep '26

Large-order net flow, last 20 sessions

Net of large-order buying minus selling, in USD. Over this window: −$7.86M (11 inflow days, 9 outflow days).

Largest holders

  • BlackRock9.67%
  • Vanguard Capital Management, LLC7.11%
  • Vanguard Portfolio Management, LLC5.31%
  • FMR4.59%
  • State Street Global Advisors4.37%

By investor type

  • Mutual Fund78.42%
  • Hedge Fund6.02%
  • Public Company3.42%
  • Government Pension Fund2.48%
  • Private Company1.50%
  • Sovereign Wealth Fund1.49%
  • Individual/Insider1.06%
  • VC/PE Fund0.49%
Institutional holders1,574
Institutional ownership94.8%

Insider activity

Total transactions18
Bought15
Sold10

Short interest

Report dateShares short% of floatDays to cover
31 Aug 2026 910,248 2.6% 2.2
14 Aug 2026 915,049 2.6% 2.4
31 Jul 2026 695,921 2.0% 1.1
15 Jul 2026 839,258 2.4% 1.9
30 Jun 2026 746,501 2.1% 1.2
15 Jun 2026 786,903 2.2% 1.7
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