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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
SC
226
SummitTX Capital
Texas
$6.25M +$5.14M +7,577 New
DCM
227
Davidson Capital Management
Texas
$6.19M -$291K -429 -5%
HW
228
Hedeker Wealth
Illinois
$6.17M +$154K +227 +3%
PCMH
229
Polymer Capital Management (HK)
Hong Kong
$6.17M +$4.38M +6,458 +637%
NMERB
230
New Mexico Educational Retirement Board
New Mexico
$6.11M – – –
X
231
Xponance
Pennsylvania
$6.1M +$77.3K +114 +2%
NMG
232
New Millennium Group
Utah
$6.03M +$4.95M +7,303 New
Two Sigma Advisers
233
Two Sigma Advisers
New York
$6.02M -$2.51M -3,700 -34%
HA
234
Homestead Advisers
Virginia
$6.01M -$339K -500 -6%
Mackenzie Financial
235
Mackenzie Financial
Ontario, Canada
$5.86M -$955K -1,409 -17%
OPERF
236
Oregon Public Employees Retirement Fund
Oregon
$5.84M -$76.6K -113 -2%
CCS
237
Concentric Capital Strategies
Connecticut
$5.69M -$1.92M -2,827 -29%
Prudential Financial
238
Prudential Financial
New Jersey
$5.69M -$1.83M -2,707 -28%
HSBC Holdings
239
HSBC Holdings
United Kingdom
$5.68M -$6.96M -10,268 -60%
Mercer Global Advisors
240
Mercer Global Advisors
Colorado
$5.67M +$2.51M +3,698 +116%
BS
241
Banco Santander
Spain
$5.65M +$4.64M +6,853 New
PIM
242
Penobscot Investment Management
Massachusetts
$5.64M +$152K +225 +3%
NAAA
243
New Age Alpha Advisors
New York
$5.58M -$142K -210 -3%
VVP
244
Venture Visionary Partners
Ohio
$5.56M +$674K +995 +17%
JFG
245
Jefferies Financial Group
New York
$5.51M +$4.21M +6,210 +1,344%
MML Investors Services
246
MML Investors Services
Massachusetts
$5.48M -$275K -406 -6%
DDPIC
247
Deroy & Devereaux Private Investment Counsel
Michigan
$5.46M -$1.91M -2,819 -30%
SIC
248
Schwartz Investment Counsel
Michigan
$5.45M – – –
AIP
249
Ameritas Investment Partners
Nebraska
$5.45M -$159K -235 -3%
BCPE
250
Bain Capital Public Equity
Massachusetts
$5.39M +$4.43M +6,536 New
8 9
10
11 12

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.