[Form 4] California Water Service Insider Trading Activity

Rhea-AI Filing Summary

Michael S. Mares Jr., SVP Operations at California Water Service Group (CWT), reported two routine dispositions to cover tax withholding on vested restricted stock awards. On 09/05/2025 he surrendered 67 shares at a price of $47.09 related to an RSA grant dated 06/05/2024. On 09/07/2025 he surrendered 53 shares at $47.09 relating to an RSA grant dated 03/07/2023. The filings show his beneficial ownership following those transactions as 10,882.6 and 10,829.6 shares respectively. The Form 4 was signed on behalf of Mr. Mares on 09/09/2025.

Insights

Corporate Governance Expert

TL;DR: Routine tax-withholding share surrender tied to restricted stock vesting; no managerial change or unusual trading pattern disclosed.

The filing documents two small, internal disposition events where shares were withheld and surrendered to satisfy tax obligations arising from the vesting of restricted stock awards. The transactions are labeled as Code F with specific RSA grant dates provided, indicating standard administrative actions rather than open-market sales. The reported remaining beneficial holdings are fractional figures consistent with net share counts after withholding. This is a routine insider administrative filing and does not reflect a change in executive role or an active trading decision.

Securities Analyst

TL;DR: Two withholding transactions of 67 and 53 shares at $47.09 appear immaterial to overall insider holdings and investor valuations.

Both transactions are described as share withholdings to cover tax liabilities from vested restricted stock (RSA grants dated 06/05/2024 and 03/07/2023). The prices reported are identical for both dates at $47.09, and the post-transaction beneficial holdings remain above 10,800 shares. Given the small absolute share counts and administrative nature, these actions are unlikely to have a material effect on market perception or company valuation.

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Mares Michael S JR

(Last) (First) (Middle)

1720 NORTH FIRST STREET

(Street)

SAN JOSE CA 95112

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
CALIFORNIA WATER SERVICE GROUP [ CWT ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	SVP Operations

3. Date of Earliest Transaction (Month/Day/Year)
09/05/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	09/05/2025		F		67(1)	D	$47.09	10,882.6	D
Common Stock	09/07/2025		F		53(2)	D	$47.09	10,829.6	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. Represents the number of shares withheld and surrendered to the issuer to satisfy the tax withholding obligations that arose in connection with the vesting of Restricted Stock (RSA) Award granted on June 5, 2024.

2. Represents the number of shares withheld and surrendered to the issuer to satisfy the tax withholding obligations that arose in connection with the vesting of Restricted Stock (RSA) Award granted on March 7, 2023.

	By: /s/ Michelle R. Mortensen For: Michael S. Mares	09/09/2025
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

What transactions did Michael S. Mares Jr. report on Form 4 for CWT?

He reported surrendering 67 shares on 09/05/2025 and 53 shares on 09/07/2025 to cover tax withholding from vested RSAs.

Why were shares disposed of according to the Form 4 for CWT?

The Form 4 states the shares were withheld and surrendered to satisfy tax withholding obligations arising from restricted stock awards.

What prices were reported for the withheld shares in the CWT Form 4?

Both transactions list a price of $47.09 per share.

How many shares did Michael Mares beneficially own after these transactions?

The filing shows beneficial ownership figures of 10,882.6 and 10,829.6 shares following the respective transactions.

When was the Form 4 signed and filed for the CWT insider transaction?

The Form 4 was signed on behalf of Michael S. Mares by Michelle R. Mortensen on 09/09/2025.