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Comfort Systems
FIX

884 hedge funds and large institutions have $27.5B invested in Comfort Systems in 2025 Q3 according to their latest regulatory filings, with 208 funds opening new positions, 281 increasing their positions, 309 reducing their positions, and 73 closing their positions.

New
Increased
Maintained
Reduced
Closed

185% more first-time investments, than exits

New positions opened: 208 | Existing positions closed: 73

51% more capital invested

Capital invested by funds: $18.1B → $27.5B (+$9.31B)

50% more funds holding in top 10

Funds holding in top 10: 16 → 24 (+8)

17% more funds holding

Funds holding: 754 → 884 (+130)

9% less repeat investments, than reductions

Existing positions increased: 281 | Existing positions reduced: 309

1.47% less ownership

Funds ownership: 95.93% → 94.46% (-1.5%)

32% less call options, than puts

Call options by funds: $145M | Put options by funds: $213M

Holders
884
Holders Change
+130
Holders Change %
+17.24%
% of All Funds
11.6%
Holding in Top 10
24
Holding in Top 10 Change
+8
Holding in Top 10 Change %
+50%
% of All Funds
0.32%
New
208
Increased
281
Reduced
309
Closed
73
Calls
$145M
Puts
$213M
Net Calls
-$68M
Net Calls Change
-$84.1M

Top Buyers

1
AT
AMF Tjänstepension
Sweden
+$220M
2
Fidelity Investments
Fidelity Investments
Massachusetts
+$218M
3
CHP
Castle Hook Partners
New York
+$189M
4
Millennium Management
Millennium Management
New York
+$138M
5
JP Morgan Chase
JP Morgan Chase
New York
+$134M

Top Sellers

1
Capital World Investors
Capital World Investors
California
-$290M
2
Fuller & Thaler Asset Management
Fuller & Thaler Asset Management
California
-$110M
3
AIM
Artemis Investment Management
United Kingdom
-$89.5M
4
Westfield Capital Management
Westfield Capital Management
Massachusetts
-$70M
5
Royal London Asset Management
Royal London Asset Management
United Kingdom
-$68.8M
Name Holding Trade Value Shares
Change 		Change in
Stake
BIA
801
Bell Investment Advisors
California
$25.6K +$678 +1 +3%
FMII
802
Farmers & Merchants Investments Inc
Nebraska
$25.6K +$1.35K +2 +7%
TFA
803
Toth Financial Advisory
Virginia
$24.8K +$20.3K +30 New
DWM
804
Darwin Wealth Management
Florida
$24.8K – – –
AG
805
AmeriFlex Group
Nevada
$24.8K +$10.2K +15 +100%
QC
806
Quent Capital
New York
$24.8K +$20.3K +30 New
SL
807
Salomon & Ludwin
Virginia
$23.7K +$19.7K +29 New
Optiver Holding
808
Optiver Holding
Netherlands
$23.1K -$29.8K -44 -61%
FDCP
809
Foster Dykema Cabot & Partners
Massachusetts
$22.3K – – –
OP
810
ORG Partners
Indiana
$22.3K +$18.3K +27 New
CIM
811
Contravisory Investment Management
Massachusetts
$21.5K +$17.6K +26 New
ANBT
812
American National Bank & Trust
Texas
$19K – – –
MCM
813
Manchester Capital Management
Vermont
$14.9K – – –
JWM
814
JPL Wealth Management
Colorado
$14.9K +$12.2K +18 New
FFO
815
Fortitude Family Office
Arizona
$14.9K +$1.35K +2 +13%
Toronto Dominion Bank
816
Toronto Dominion Bank
Ontario, Canada
$14K +$11.5K +17 New
AT
817
Avalon Trust
New Mexico
$13.2K – – –
BBHC
818
Brown Brothers Harriman & Co
New York
$13.2K – – –
PWMG
819
Private Wealth Management Group
New Jersey
$11.6K -$1.35K -2 -13%
PAI
820
Pittenger & Anderson Inc
Nebraska
$11.6K +$4.07K +6 +75%
MSG
821
Main Street Group
Virginia
$10.7K +$8.81K +13 New
GFWA
822
Grey Fox Wealth Advisors
Delaware
$9.9K +$8.13K +12 New
HWA
823
Heritage Wealth Advisors
Virginia
$9.55K – – –
AA
824
Ancora Advisors
Ohio
$9.08K – – –
CT
825
Clearstead Trust
Maine
$9.08K – – –
31 32
33
34 35

FIX Hedge Fund Activity: Q3 2025 in Review

884 of the 7,619 institutional investors tracked by Wall St. Rank reported a position in Comfort Systems (FIX) for Q3 2025, worth a combined $27.5B — up 51% from $18.1B a quarter earlier.

Buyers outnumbered sellers: 208 funds opened new FIX positions and 73 closed out — a net gain of 135 holders — while 281 added to existing stakes and 309 trimmed.

The largest buyer was AMF Tjänstepension, opening a new position worth an estimated $220M. The largest seller was Capital World Investors, cutting an estimated $290M.

  • 884 institutional investors held Comfort Systems (FIX) as of Q3 2025, up from 754 in Q2 2025.
  • Funds reported $27.5B of Comfort Systems stock for Q3 2025, up 51% quarter-over-quarter.
  • 208 funds opened new Comfort Systems positions in Q3 2025 and 73 closed out, a net change of +135 holders.
  • The largest Comfort Systems buyer in Q3 2025 was AMF Tjänstepension, an estimated $220M added.
  • The largest Comfort Systems seller in Q3 2025 was Capital World Investors, an estimated $290M sold.

Based on aggregated 13F filings for Q3 2025.