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California Water Service
CWT

337 hedge funds and large institutions have $2.3B invested in California Water Service in 2025 Q3 according to their latest regulatory filings, with 35 funds opening new positions, 122 increasing their positions, 110 reducing their positions, and 31 closing their positions.

New
Increased
Maintained
Reduced
Closed

1,456% more call options, than puts

Call options by funds: $3.64M | Put options by funds: $234K

13% more first-time investments, than exits

New positions opened: 35 | Existing positions closed: 31

11% more repeat investments, than reductions

Existing positions increased: 122 | Existing positions reduced: 110

0% more funds holding in top 10

Funds holding in top 10: 1 → 1 (0)

0% less funds holding

Funds holding: 338 → 337 (-1)

0.48% less ownership

Funds ownership: 84.54% → 84.06% (-0.48%)

2% less capital invested

Capital invested by funds: $2.36B → $2.3B (-$57.9M)

Holders
337
Holders Change
-1
Holders Change %
-0.3%
% of All Funds
4.42%
Holding in Top 10
1
Holding in Top 10 Change
–
Holding in Top 10 Change %
–
% of All Funds
0.01%
New
35
Increased
122
Reduced
110
Closed
31
Calls
$3.64M
Puts
$234K
Net Calls
+$3.41M
Net Calls Change
+$3.44M

Top Buyers

1
Amundi
Amundi
France
+$17M
2
Millennium Management
Millennium Management
New York
+$16.6M
3
Fidelity Investments
Fidelity Investments
Massachusetts
+$16.1M
4
American Century Companies
American Century Companies
Missouri
+$5.21M
5
BlackRock
BlackRock
New York
+$3.64M

Top Sellers

1
KBC Group
KBC Group
Belgium
-$5.37M
2
UBS AM
UBS AM
Illinois
-$5.04M
3
Adage Capital Partners
Adage Capital Partners
Massachusetts
-$4.55M
4
JAM
Jupiter Asset Management
United Kingdom
-$4.25M
5
State Street
State Street
Massachusetts
-$3.79M
Name Holding Trade Value Shares
Change 		Change in
Stake
Mariner
51
Mariner
Kansas
$4.39M +$1.26M +27,306 +40%
MYAM
52
Meiji Yasuda Asset Management
Japan
$4.23M +$93.9K +2,040 +2%
CIC
53
Crawford Investment Counsel
Georgia
$4.13M +$204K +4,440 +5%
Jacobs Levy Equity Management
54
Jacobs Levy Equity Management
New Jersey
$3.86M +$190K +4,120 +5%
Deutsche Bank
55
Deutsche Bank
Germany
$3.85M +$325K +7,057 +9%
Prudential Financial
56
Prudential Financial
New Jersey
$3.82M -$335K -7,280 -8%
MAM
57
Martingale Asset Management
Massachusetts
$3.79M +$23.9K +519 +0.6%
Wells Fargo
58
Wells Fargo
California
$3.65M +$353K +7,660 +11%
TI
59
Trexquant Investment
Connecticut
$3.07M -$732K -15,898 -19%
MSRPS
60
Maryland State Retirement & Pension System
Maryland
$2.93M -$336K -7,308 -10%
New York State Teachers Retirement System (NYSTRS)
61
New York State Teachers Retirement System (NYSTRS)
New York
$2.87M – – –
RB
62
Rodgers Brothers
Pennsylvania
$2.65M -$152K -3,300 -5%
KCM
63
Kennedy Capital Management
Missouri
$2.64M +$967 +21 +0%
SAM
64
Storebrand Asset Management
Norway
$2.64M -$94K -2,041 -3%
Arrowstreet Capital
65
Arrowstreet Capital
Massachusetts
$2.62M -$967K -21,009 -27%
California State Teachers Retirement System (CalSTRS)
66
California State Teachers Retirement System (CalSTRS)
California
$2.6M +$108K +2,345 +4%
MT
67
Midwest Trust
Kansas
$2.53M -$5.52K -120 -0.2%
Royal Bank of Canada
68
Royal Bank of Canada
Ontario, Canada
$2.47M -$3.44M -74,683 -58%
BNP Paribas Financial Markets
69
BNP Paribas Financial Markets
France
$2.46M +$766K +16,635 +45%
ETC
70
Exchange Traded Concepts
Oklahoma
$2.39M +$70.8K +1,538 +3%
TD Asset Management
71
TD Asset Management
Ontario, Canada
$2.38M – – –
CHAM
72
Clear Harbor Asset Management
Connecticut
$2.34M – – –
Allianz Asset Management
73
Allianz Asset Management
Germany
$2.31M +$184K +4,003 +9%
Mercer Global Advisors
74
Mercer Global Advisors
Colorado
$2.28M +$108K +2,339 +5%
Citigroup
75
Citigroup
New York
$2.2M -$653K -14,191 -23%
1 2
3
4 5

CWT Hedge Fund Activity: Q3 2025 in Review

337 of the 7,619 institutional investors tracked by Wall St. Rank reported a position in California Water Service (CWT) for Q3 2025, worth a combined $2.3B — down 2.5% from $2.36B a quarter earlier.

Buyers outnumbered sellers: 35 funds opened new CWT positions and 31 closed out — a net gain of 4 holders — while 122 added to existing stakes and 110 trimmed.

The largest buyer was Amundi, adding an estimated $17M. The largest seller was KBC Group, cutting an estimated $5.37M.

  • 337 institutional investors held California Water Service (CWT) as of Q3 2025, down from 338 in Q2 2025.
  • Funds reported $2.3B of California Water Service stock for Q3 2025, down 2.5% quarter-over-quarter.
  • 35 funds opened new California Water Service positions in Q3 2025 and 31 closed out, a net change of +4 holders.
  • The largest California Water Service buyer in Q3 2025 was Amundi, an estimated $17M added.
  • The largest California Water Service seller in Q3 2025 was KBC Group, an estimated $5.37M sold.

Based on aggregated 13F filings for Q3 2025.