California Water Service
329 hedge funds and large institutions have $2.17B invested in California Water Service in 2025 Q4 according to their latest regulatory filings, with 38 funds opening new positions, 97 increasing their positions, 130 reducing their positions, and 39 closing their positions.
35,000% more call options, than puts
Call options by funds: $3.16M | Put options by funds: $9K
0.03% more ownership
Funds ownership: 84.06% → 84.08% (+0.03%)
0% more funds holding in top 10
Funds holding in top 10: 1 → 1 (0)
3% less first-time investments, than exits
New positions opened: 38 | Existing positions closed: 39
2% less funds holding
Funds holding: 337 → 329 (-8)
6% less capital invested
Capital invested by funds: $2.3B → $2.17B (-$127M)
25% less repeat investments, than reductions
Existing positions increased: 97 | Existing positions reduced: 130
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Amundi
Paris,
France
|
+$21.1M |
| 2 |
Fidelity Investments
Boston,
Massachusetts
|
+$17.9M |
| 3 |
ECM
ExodusPoint Capital Management
New York
|
+$10.9M |
| 4 |
BlackRock
New York
|
+$10.6M |
| 5 |
Citadel Advisors
Miami,
Florida
|
+$7.24M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Millennium Management
New York
|
-$12.7M |
| 2 |
Renaissance Technologies
New York
|
-$8.63M |
| 3 |
American Century Companies
Kansas City,
Missouri
|
-$4.55M |
| 4 |
NAAA
New Age Alpha Advisors
Rye,
New York
|
-$4.34M |
| 5 |
TIM
Triodos Investment Management
Driebergen-Rijsenburg,
Netherlands
|
-$3.6M |
CWT Hedge Fund Activity: Q4 2025 in Review
329 of the 8,267 institutional investors tracked by Wall St. Rank reported a position in California Water Service (CWT) for Q4 2025, worth a combined $2.17B — down 5.5% from $2.3B a quarter earlier.
Sellers outnumbered buyers: 39 funds closed out of CWT and 38 opened new positions — a net loss of 1 holder — while 130 trimmed existing stakes and 97 added.
The largest buyer was Amundi, adding an estimated $21.1M. The largest seller was Millennium Management, cutting an estimated $12.7M.
- 329 institutional investors held California Water Service (CWT) as of Q4 2025, down from 337 in Q3 2025.
- Funds reported $2.17B of California Water Service stock for Q4 2025, down 5.5% quarter-over-quarter.
- 38 funds opened new California Water Service positions in Q4 2025 and 39 closed out, a net change of -1 holder.
- The largest California Water Service buyer in Q4 2025 was Amundi, an estimated $21.1M added.
- The largest California Water Service seller in Q4 2025 was Millennium Management, an estimated $12.7M sold.
Based on aggregated 13F filings for Q4 2025.