Comfort Systems
1,040 hedge funds and large institutions have $31B invested in Comfort Systems in 2025 Q4 according to their latest regulatory filings, with 258 funds opening new positions, 353 increasing their positions, 338 reducing their positions, and 83 closing their positions.
211% more first-time investments, than exits
New positions opened: 258 | Existing positions closed: 83
17% more funds holding
Funds holding: 887 → 1,040 (+153)
13% more capital invested
Capital invested by funds: $27.5B → $31B (+$3.5B)
4% more repeat investments, than reductions
Existing positions increased: 353 | Existing positions reduced: 338
0.46% less ownership
Funds ownership: 94.47% → 94.01% (-0.46%)
25% less funds holding in top 10
Funds holding in top 10: 24 → 18 (-6)
51% less call options, than puts
Call options by funds: $235M | Put options by funds: $480M
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Vanguard Group
Malvern,
Pennsylvania
|
+$578M |
| 2 |
State Street
Boston,
Massachusetts
|
+$346M |
| 3 |
Geode Capital Management
Boston,
Massachusetts
|
+$307M |
| 4 |
AQR Capital Management
Greenwich,
Connecticut
|
+$170M |
| 5 |
SG Americas Securities
New York
|
+$111M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
BlackRock
New York
|
-$488M |
| 2 |
Invesco
Atlanta,
Georgia
|
-$380M |
| 3 |
Millennium Management
New York
|
-$274M |
| 4 |
Fidelity Investments
Boston,
Massachusetts
|
-$204M |
| 5 |
Westfield Capital Management
Boston,
Massachusetts
|
-$152M |
FIX Hedge Fund Activity: Q4 2025 in Review
1,040 of the 8,266 institutional investors tracked by Wall St. Rank reported a position in Comfort Systems (FIX) for Q4 2025, worth a combined $31B — up 13% from $27.5B a quarter earlier.
Buyers outnumbered sellers: 258 funds opened new FIX positions and 83 closed out — a net gain of 175 holders — while 353 added to existing stakes and 338 trimmed.
The largest buyer was Vanguard Group, adding an estimated $578M. The largest seller was BlackRock, cutting an estimated $488M.
- 1,040 institutional investors held Comfort Systems (FIX) as of Q4 2025, up from 887 in Q3 2025.
- Funds reported $31B of Comfort Systems stock for Q4 2025, up 13% quarter-over-quarter.
- 258 funds opened new Comfort Systems positions in Q4 2025 and 83 closed out, a net change of +175 holders.
- The largest Comfort Systems buyer in Q4 2025 was Vanguard Group, an estimated $578M added.
- The largest Comfort Systems seller in Q4 2025 was BlackRock, an estimated $488M sold.
Based on aggregated 13F filings for Q4 2025.