Comfort Systems
FIX
888 hedge funds and large institutions have $27.5B invested in Comfort Systems in 2025 Q3 according to their latest regulatory filings, with 212 funds opening new positions, 281 increasing their positions, 309 reducing their positions, and 73 closing their positions.
190% more first-time investments, than exits
New positions opened: 212 | Existing positions closed: 73
50% more funds holding in top 10
Funds holding in top 10: 16 → 24 (+8)
18% more funds holding
Funds holding: 754 → 888 (+134)
8% less capital inflows, than outflows
Capital inflows: $2.46B | Capital outflows: $2.68B
9% less repeat investments, than reductions
Existing positions increased: 281 | Existing positions reduced: 309
1.44% less ownership
Funds ownership: 95.91% → 94.47% (-1.4%)
32% less call options, than puts
Call options by funds: $145M | Put options by funds: $213M
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
AMF Tjänstepension
Stockholm,
Sweden
|
+$220M |
| 2 |
Fidelity Investments
Boston,
Massachusetts
|
+$218M |
| 3 |
Castle Hook Partners
New York
|
+$189M |
| 4 |
Millennium Management
New York
|
+$138M |
| 5 |
JP Morgan Chase
New York
|
+$134M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Capital World Investors
Los Angeles,
California
|
-$290M |
| 2 |
Fuller & Thaler Asset Management
San Mateo,
California
|
-$110M |
| 3 |
Artemis Investment Management
Edinburgh,
United Kingdom
|
-$89.5M |
| 4 |
Westfield Capital Management
Boston,
Massachusetts
|
-$70M |
| 5 |
Royal London Asset Management
United Kingdom
|
-$68.8M |
FIX Hedge Fund Activity: Q3 2025 in Review
888 of the 7,650 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: 212 funds opened new FIX positions and 73 closed out — a net gain of 139 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.
- 888 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.
- 212 funds opened new Comfort Systems positions in Q3 2025 and 73 closed out, a net change of +139 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.