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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
SEI Investments
101
SEI Investments
Pennsylvania
$38.3M +$1.88M +2,778 +6%
NPIC
102
Neumeier Poma Investment Counsel
California
$37.6M -$9.12M -13,462 -23%
Schroder Investment Management Group
103
Schroder Investment Management Group
United Kingdom
$36.3M -$17.4M -25,700 -37%
AG
104
Algert Global
California
$36M +$4.36M +6,440 +17%
Macquarie Group
105
Macquarie Group
Australia
$35.4M +$448K +661 +2%
SPPAM
106
Summit Partners Public Asset Management
Massachusetts
$33M – – –
BL
107
BWCP LP
Texas
$32.8M +$660K +974 +3%
GAM
108
Gotham Asset Management
New York
$31.4M +$5.35M +7,895 +26%
Point72 Asset Management
109
Point72 Asset Management
Connecticut
$28.8M +$23.6M +34,884 New
T. Rowe Price Investment Management
110
T. Rowe Price Investment Management
Maryland
$28.5M +$9.91M +14,627 +73%
VanEck Associates
111
VanEck Associates
New York
$28.4M +$422K +623 +2%
FAM
112
Fred Alger Management
New York
$28.1M -$5.55M -8,189 -19%
New York State Common Retirement Fund
113
New York State Common Retirement Fund
New York
$28M +$10.9M +16,140 +91%
California State Teachers Retirement System (CalSTRS)
114
California State Teachers Retirement System (CalSTRS)
California
$28M +$667K +984 +3%
Assenagon Asset Management
115
Assenagon Asset Management
Luxembourg
$27.6M -$18.9M -27,895 -45%
State Board of Administration of Florida Retirement System
116
State Board of Administration of Florida Retirement System
Florida
$27.5M -$1.72M -2,544 -7%
Cerity Partners
117
Cerity Partners
New York
$27.2M +$4.01M +5,912 +22%
Truist Financial
118
Truist Financial
North Carolina
$26.9M -$4.95M -7,305 -18%
PAM
119
Panagora Asset Management
Massachusetts
$26.8M +$1.91M +2,825 +10%
Winslow Capital Management
120
Winslow Capital Management
Minnesota
$26.7M +$2.25M +3,320 +11%
New York State Teachers Retirement System (NYSTRS)
121
New York State Teachers Retirement System (NYSTRS)
New York
$26.7M +$3.57M +5,262 +19%
Bessemer Group
122
Bessemer Group
New Jersey
$24.5M -$1.02M -1,501 -5%
CIBC World Market
123
CIBC World Market
Ontario, Canada
$24.3M +$5.82M +8,581 +41%
Credit Agricole
124
Credit Agricole
France
$23.8M +$19.6M +28,873 New
Universal-Beteiligungs- und Servicegesellschaft
125
Universal-Beteiligungs- und Servicegesellschaft
Germany
$23.8M -$4.62M -6,822 -19%
3 4
5
6 7

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.