Amundi reports 5.83% stake in California Water Service

California Water Service Group is the issuer of common shares reported in this Schedule 13G/A Amendment No. 1.

Rhea-AI Filing Summary

California Water Service Group is the issuer of common shares reported in this Schedule 13G/A Amendment No. 1. The filing reports that Amundi and its subsidiary Amundi Asset Management, both organized under the laws of France, are beneficial owners of these shares.

The filing states that Amundi and Amundi Asset Management beneficially own 3,489,311 common shares of California Water Service Group, representing 5.83% of the class. They report shared voting power over 1,894,617 shares and shared dispositive power over 3,489,311 shares, with no sole voting or dispositive power. The filing also identifies KBI Global Investors (North America) Ltd and KBI Global Investors Ltd as relevant subsidiaries. The signatures are provided by John M. Malone as Chief Compliance Officer under a Power of Attorney.

Key Figures

Beneficial ownership: 3,489,311 shares Percent of class: 5.83% Shared voting power: 1,894,617 shares +1 more

4 metrics

Beneficial ownership 3,489,311 shares Common shares of California Water Service Group beneficially owned by Amundi and Amundi Asset Management

Percent of class 5.83% Percentage of California Water Service Group common shares beneficially owned

Shared voting power 1,894,617 shares Shares over which Amundi and Amundi Asset Management have shared power to vote

Shared dispositive power 3,489,311 shares Shares over which Amundi and Amundi Asset Management have shared power to dispose

Key Terms

Beneficially owned, Shared voting power, Shared dispositive power, Percent of class, +1 more

5 terms

Beneficially owned financial

"Item 4. | Ownership (a) | Amount beneficially owned: 3,489,311"

Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.

Shared voting power financial

"Shared Voting Power 1,894,617.00 7 | Sole Dispositive Power 0.00"

Shared voting power occurs when two or more parties jointly have the right to vote or decide how a block of company shares is cast, like co-owners who must agree before moving a piece of furniture. Investors care because who controls voting rights affects board elections, major corporate decisions and takeover outcomes, and shared control can alter regulatory disclosures and the practical influence any holder has over a company’s direction and value.

Shared dispositive power financial

"Shared Dispositive Power 3,489,311.00 9 3,489,311.00"

Percent of class financial

"Percent of class: 5.83%"

Percent of class is the portion of a specific category of securities—such as a company’s common shares, preferred shares, or a bond series—that takes part in or approves a corporate action (vote, consent, tender, etc.). Investors watch this number because it reveals how much support or opposition exists within that particular shareholder group; like counting how many members of a club back a proposal, it can determine whether a plan passes or how influence is distributed.

Parent holding company regulatory

"If a parent holding company has filed this schedule, pursuant to (ii)(G)"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What percentage of California Water Service Group (CWT) shares does Amundi report owning?

Amundi and Amundi Asset Management report beneficial ownership of 5.83% of California Water Service Group’s common shares, representing 3,489,311 shares according to the Schedule 13G/A Amendment No. 1 filing.

How many CWT shares does Amundi have voting power over in this Schedule 13G/A?

Amundi and Amundi Asset Management report shared voting power over 1,894,617 California Water Service Group shares and no sole voting power, as disclosed in the ownership breakdown.

What is the total number of CWT shares beneficially owned by Amundi in this filing?

The filing reports that Amundi and Amundi Asset Management beneficially own 3,489,311 California Water Service Group common shares, representing 5.83% of the outstanding class of that security.

Does Amundi have dispositive power over its California Water Service Group (CWT) shares?

Yes. Amundi and Amundi Asset Management report shared dispositive power over 3,489,311 California Water Service Group shares and no sole dispositive power, meaning decisions to dispose are shared rather than individual.

Which entities are identified as related subsidiaries in Amundi’s CWT Schedule 13G/A?

The filing identifies Amundi Asset Management, KBI Global Investors (North America) Ltd, and KBI Global Investors Ltd as relevant subsidiaries connected to the reported ownership of California Water Service Group shares.

Who signed the Schedule 13G/A for Amundi relating to California Water Service Group (CWT)?

The Schedule 13G/A is signed by John M. Malone, acting as Chief Compliance Officer under a Power of Attorney, dated 07/22/2026, on behalf of the reporting persons.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 07/22/2026 - 09:46 AM Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 1)

CALIFORNIA WATER SERVICE GROUP

(Name of Issuer)

Common Shares, par value $0.01

(Title of Class of Securities)

130788102

(CUSIP Number)

06/30/2026

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

schemaVersion:

SCHEDULE 13G

CUSIP Number(s): 130788102

1

Names of Reporting Persons

AMUNDI

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

FRANCE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 1,894,617.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 3,489,311.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

3,489,311.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

5.83 %

12

Type of Reporting Person (See Instructions)

HC

SCHEDULE 13G

CUSIP Number(s): 130788102

1

Names of Reporting Persons

AMUNDI ASSET MANAGEMENT

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

FRANCE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 1,894,617.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 3,489,311.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

3,489,311.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

5.83 %

12

Type of Reporting Person (See Instructions)

HC

SCHEDULE 13G

Item 1.
(a)	Name of issuer: CALIFORNIA WATER SERVICE GROUP
(b)	Address of issuer's principal executive offices: 1720 North First Street, San Jose, CA 95112
Item 2.
(a)	Name of person filing: Amundi Amundi Asset Management
(b)	Address or principal business office or, if none, residence: Amundi: 91-93 boulevard Pasteur, 75015 Paris, France Amundi Asset Management: 91-93 boulevard Pasteur, 75015 Paris, France
(c)	Citizenship: Both Amundi and Amundi Asset Management are organized under the laws of the Republic of France.
(d)	Title of class of securities: Common Shares, par value $0.01
(e)	CUSIP No.: 130788102
Item 3.	If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)	An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)	An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
(k)	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.	Ownership
(a)	Amount beneficially owned: 3,489,311
(b)	Percent of class: 5.83%
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 0
	(ii) Shared power to vote or to direct the vote: 1,894,617
	(iii) Sole power to dispose or to direct the disposition of: 0
	(iv) Shared power to dispose or to direct the disposition of: 3,489,311
Item 5.	Ownership of 5 Percent or Less of a Class.
	Not Applicable
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	Not Applicable
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	If a parent holding company has filed this schedule, pursuant to Rule 13d-1(b)(ii)(G), so indicate under Item 3(g) and attach an exhibit stating the identity and the Item 3 classification of the relevant subsidiary. If a parent holding company has filed this schedule pursuant to Rule 13d-1(c) or Rule 13d-1(d), attach an exhibit stating the identification of the relevant subsidiary. Amundi Asset Management KBI Global Investors (North America) Ltd KBI Global Investors Ltd
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10.

Certifications:

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

AMUNDI

Signature:	John M. Malone
Name/Title:	John M. Malone | Chief Compliance Officer | Power of Attorney
Date:	07/22/2026

AMUNDI ASSET MANAGEMENT

Signature:	John M. Malone
Name/Title:	John M. Malone | Chief Compliance Officer | Power of Attorney
Date:	07/22/2026