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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
MFS
901
Mirabella Financial Services
United Kingdom
– -$1.1M -2,060 Closed
M1FG
902
Mach-1 Financial Group
Arkansas
– -$1.1M -2,054 Closed
DAS
903
Dynamic Advisor Solutions
Arizona
– -$1.1M -2,053 Closed
MCM
904
Monimus Capital Management
New Jersey
– -$1.08M -2,015 Closed
ACM
905
Aster Capital Management
United Arab Emirates
– -$1.02M -1,903 Closed
SSA
906
Sierra Summit Advisors
Nevada
– -$964K -1,798 Closed
CG
907
Cynosure Group
Utah
– -$953K -1,778 Closed
II
908
Inspire Investing
Idaho
– -$893K -1,665 Closed
OAC
909
OMERS Administration Corp
Ontario, Canada
– -$858K -1,600 Closed
QC
910
Quadrature Capital
United Kingdom
– -$810K -1,511 Closed
NRD
911
Nebula Research & Development
New York
– -$769K -1,434 Closed
PCP
912
Perbak Capital Partners
United Kingdom
– -$603K -1,125 Closed
MWM
913
Maridea Wealth Management
New York
– -$572K -1,067 Closed
WG
914
Winton Group
United Kingdom
– -$567K -1,057 Closed
FIM
915
Freedom Investment Management
Connecticut
– -$486K -906 Closed
CP
916
CenterBook Partners
Connecticut
– -$473K -882 Closed
QIM
917
Quantitative Investment Management
Virginia
– -$438K -817 Closed
EDRH
918
Edmond de Rothschild Holding
Switzerland
– -$429K -800 Closed
PCM
919
Polymer Capital Management
New York
– -$426K -795 Closed
CMF
920
Counterpoint Mutual Funds
California
– -$423K -788 Closed
TC
921
TownSquare Capital
Utah
– -$375K -699 Closed
ACP
922
Arcus Capital Partners
Georgia
– -$365K -680 Closed
DTL
923
Dynamic Technology Lab
Singapore
– -$361K -674 Closed
DWM
924
Dakota Wealth Management
Florida
– -$346K -646 Closed
HIS
925
Harvest Investment Services
Illinois
– -$320K -597 Closed
35 36
37
38 39

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.