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FIX · Comfort Systems USA Inc

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$1,610.34 +30.15 (+1.91%) At close · Sep 4
Market Cap
$54.91B
Shares
35.19M

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Holders: 1,358
Total Value: $66,837,275,110
Total Shares: 33,738,449
Showing 1–100 of 1,395 holdings by value · page 1 of 14

Institutional Ownership Trend

26 quarters

Holder Concentration

Across 1,358 13F filers · Δ vs Mar 31, 2026
Top Holder
10.1%
Sep 2023 → Jun 2026 · range 10.1% – 17.4%
−0.4 pts
Top 5
31.9%
Sep 2023 → Jun 2026 · range 31.6% – 42.0%
+0.3 pts
Top 10
45.0%
Sep 2023 → Jun 2026 · range 45.0% – 54.3%
−0.7 pts
HHI
286
Sep 2023 → Jun 2026 · range 286 – 567
Broadly held−8

Quarterly Activity

vs Mar 31, 2026
New
246
Increased
501
Decreased
488
Sold Out
96
Unchanged
123
Holder count: +150
Institutional value: +44.4%
Shares held: +0.5%

Top Buyers

vs Mar 31, 2026
Institution Added Now Holds Open

Top Sellers

vs Mar 31, 2026
Institution Sold Now Holds Open

Top New Positions

vs Mar 31, 2026
Institution Acquired Value (USD) Open

Top Sold-Out Positions

vs Mar 31, 2026
Institution Previously Held Last Value (USD) Open
Showing 100 of 1,395
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Holder Value (USD) % of 13F Shares Open
Key facts CIK 1035983 CUSIP 199908104 13F (30d) 746 filings 733 filers Visit website Investor relations