California Water Service Group (CWT) SVP reports tax-withheld share transactions

Rhea-AI Filing Summary

California Water Service Group Senior Vice President of Operations Michael S. Mares reported routine share transactions related to tax withholding on vested equity awards. On December 5, 2025, 67 shares of common stock were withheld and surrendered to the company at $44.88 per share to cover taxes on a Restricted Stock Award granted on June 5, 2024. On December 7, 2025, an additional 53 shares were similarly withheld at $44.88 per share for a Restricted Stock Award granted on March 7, 2023. After these transactions, Mares beneficially owned 10,709.6 shares of California Water Service Group common stock in direct ownership.

Insider Trade Summary

2 transactions reported

Mixed 2 txns

Insider Mares Michael S JR

Role SVP Operations

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock	53	$44.88	$2K
Tax Withholding	Common Stock	67	$44.88	$3K

Holdings After Transaction: Common Stock — 10,709.6 shares (Direct)

Footnotes (1)

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. 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.

Form 4 Insider Transactions: What Each Field Means →

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)
12/05/2025

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	12/05/2025		F		67(1)	D	$44.88	10,762.6	D
Common Stock	12/07/2025		F		53(2)	D	$44.88	10,709.6	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	12/09/2025
	** 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 insider transaction did CWT report for Michael S. Mares?

The filing reports that Michael S. Mares, Senior Vice President of Operations of California Water Service Group, had shares of common stock withheld and surrendered to the company to cover tax obligations arising from the vesting of Restricted Stock Awards.

How many CWT shares were withheld for taxes in this Form 4?

The report shows that 67 shares were withheld on December 5, 2025 and 53 shares were withheld on December 7, 2025, both to satisfy tax withholding obligations on vested Restricted Stock Awards.

At what price were the California Water Service Group shares withheld?

Both transactions list a price of $44.88 per share for the California Water Service Group common stock withheld to satisfy tax withholding obligations.

What is Michael S. Mares’ role at California Water Service Group (CWT)?

Michael S. Mares is reported as an officer of California Water Service Group, serving as SVP Operations in this Form 4.

How many CWT shares does Michael S. Mares own after these transactions?

Following the reported tax withholding transactions, Michael S. Mares beneficially owned 10,709.6 shares of California Water Service Group common stock in direct ownership.

Were these CWT insider transactions part of option or derivative exercises?

No derivative securities are reported. The transactions relate to common stock withheld to cover taxes on vested Restricted Stock (RSA) Awards, and the table for derivative securities shows no entries.

Why were CWT shares surrendered to the issuer in this Form 4?

The explanation states that the surrendered shares represent amounts withheld and given back to the issuer to satisfy tax withholding obligations from the vesting of Restricted Stock Awards granted in June 2024 and March 2023.