California Water Service Group Ownership | Who Owns California Water Service Group?

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California Water Service Group Ownership Summary

California Water Service Group is owned by 66.27% institutional investors, 0.63% insiders, and 33.10% retail investors. Blackrock funding, inc. /de is the largest institutional shareholder, holding 17.93% of CWT shares. iShares Core S&P Small-Cap ETF is the top mutual fund, with 6.06% of its assets in California Water Service Group shares.

CWT Ownership Benchmark

Type	Name	% Inst	% Insiders	% Retail
Stock	California Water Service Group	66.27%	0.63%	33.10%
Sector	Utilities Stocks	35.28%	8.46%	56.27%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Blackrock funding, inc. /de	10.68M	17.93%	$462.82M
Blackrock	10.32M	17.87%	$500.39M
Vanguard group	7.35M	12.33%	$318.32M
T. rowe price investment management	3.30M	5.54%	$151.48M
State street	3.10M	5.21%	$142.30M
Amundi	2.28M	3.82%	$104.32M
Nuance investments	1.83M	3.06%	$79.09M
Geode capital management	1.42M	2.38%	$61.58M
First trust advisors lp	1.40M	2.36%	$64.44M
Fmr	1.40M	2.36%	$64.39M

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Nuance investments	1.83M	8.71%	$79.09M
Beck bode	388.42K	2.80%	$16.83M
Triodos investment management bv	414.00K	1.30%	$18.04M
Northstar asset management	82.86K	0.93%	$3.59M
Wulff, hansen	19.63K	0.71%	$850.35K
Teton advisors	20.06K	0.56%	$912.33K
Nia impact advisors	37.22K	0.54%	$1.61M
Bridge city capital	38.58K	0.49%	$1.67M
Cbre investment management listed real assets	722.35K	0.46%	$31.30M
Rodgers brothers	57.77K	0.33%	$2.65M

Top Buyers

Holder	Shares	% Assets	Change
Amundi	2.28M	0.03%	369.43K
Fmr	1.40M	0.00%	350.54K
Blackrock funding, inc. /de	10.68M	0.01%	233.12K
American century companies	227.82K	0.01%	113.19K
Nuance investments	1.83M	8.71%	60.93K

Top Sellers

Holder	Shares	% Assets	Change
Impax asset management group	-	-	-861.34K
Blackrock	10.32M	0.01%	-414.95K
Deprince race & zollo	-	-	-267.34K
Granite investment partners	-	-	-266.78K
1832 asset management	-	-	-200.00K

New Positions

Holder	Shares	% Assets	Change	Value
Voloridge investment management	22.32K	0.00%	22.32K	$1.02M
Norges bank	22.11K	0.00%	22.11K	$958.20K
Y-intercept (hong kong)	19.96K	0.02%	19.96K	$864.69K
Brevan howard capital management lp	18.80K	0.00%	18.80K	$862.50K
Campbell & co investment adviser	13.24K	0.03%	13.24K	$573.56K

Sold Out

Holder	Change
Claris advisors, llc / mo /	-2.00
Tfo-tdc	-2.00
Mendota financial group	-5.00
Global financial private client	-5.00
Castleview partners	-6.00

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
Dec 31, 2025	283	-16.27%	39,487,503	-21.06%	66	0.94%	114	-27.85%	109	-
Sep 30, 2025	322	-3.59%	49,491,183	-1.53%	83	1.17%	149	-10.24%	105	-9.48%
Jun 30, 2025	328	0.31%	50,158,617	0.79%	84	1.20%	165	-1.20%	114	14.00%
Mar 31, 2025	323	0.94%	49,733,335	1.32%	83	1.20%	167	-	98	-
Dec 31, 2024	317	-0.94%	49,071,653	2.54%	83	1.26%	164	6.49%	97	-7.62%

Top Mutual Funds Shareholders

Holder	Shares	% Holding	Change
iShares Core S&P Small-Cap ETF	3.62M	6.06%	-243.85K
Vanguard US Total Market Shares ETF	1.91M	3.21%	92.03K
Vanguard Total Stock Mkt Idx Inv	1.87M	3.14%	6.92K
Fidelity Small Cap Value Fund	1.79M	3.00%	-
iShares Russell 2000 ETF	1.43M	2.40%	275.75K
Vanguard Small Cap Index	1.35M	2.26%	-1.11K
Amundi KBI Aqua C	1.13M	1.89%	111.76K
Nuance Mid Cap Value Separate Account	1.06M	1.77%	102.38K
iShares Global Water ETF USD Dist	1.03M	1.73%	290.53K
Amundi - KBI Aqua ISR C	1.01M	1.70%	132.78K

Recent Insider Transactions

Date	Name	Role	Activity	Value
Dec 23, 2025	Mortensen Michelle R	VP, Corp Sec &Chief of Staff	Sell	$40.05K
Dec 10, 2025	Lynch James Patrick	SVP CFO and Treasurer	Buy	$23.54K
Jun 12, 2025	Snow Lester A	-	Sell	$55.81K
Nov 22, 2024	Luu Michael B	Sr. VP Corp Svcs & Chief Risk	Sell	$50.73K
Sep 04, 2024	Krummel Thomas M	-	Sell	$30.57K

Insider Transactions Trends

Date	Buy	Sell
2026 Q1	-	-
2025 Q4	1	1
2025 Q3	-	-
2025 Q2	-	1
2025 Q1	-	-

CWT Ownership FAQ

Who owns the most shares of California Water Service Group?

California Water Service Group’s largest shareholders are Blackrock funding, inc. /de (10.68M shares, 17.93%), Blackrock (10.32M shares, 17.87%), and Vanguard group (7.35M shares, 12.33%). Together, they hold 48.13% of California Water Service Group’s total shares outstanding.

Does Blackrock own California Water Service Group?

Yes, BlackRock owns 17.87% of California Water Service Group, totaling 10.32M shares as of Jun 2024. This represents 0.01% of BlackRock's total assets, with a market value of 500.39M$. In the last quarter, BlackRock decreased its holdings by -415K shares, a -3.87% change.

Who is California Water Service Group’s biggest shareholder by percentage of total assets invested?

Nuance investments is California Water Service Group’s biggest shareholder by percentage of total assets invested, with 8.71% of its assets in 1.83M California Water Service Group shares, valued at 79.09M$.

Who is the top mutual fund holder of California Water Service Group shares?

iShares Core S&P Small-Cap ETF is the top mutual fund holder of California Water Service Group shares, with 6.06% of its total shares outstanding invested in 3.62M California Water Service Group shares.

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