California Water Service Group (NYSE: CWT) officer reports RSA tax-withholding trades

Rhea-AI Filing Summary

California Water Service Group officer Greg A. Milleman reported routine share transactions related to tax withholding on vested restricted stock awards. On December 5, 2025, 66 shares of common stock were withheld and surrendered to the company at a price of $44.88 per share to cover tax obligations from a restricted stock award granted on June 5, 2024. On December 7, 2025, an additional 51 shares were withheld and surrendered at $44.88 per share in connection with a restricted stock award granted on March 7, 2023. Following these transactions, Milleman directly beneficially owned 11,553.15 shares of California Water Service Group common stock.

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

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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^*

Milleman Greg A

(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)
	VP Rates & Regulatory Affairs

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		66(1)	D	$44.88	11,604.15	D
Common Stock	12/07/2025		F		51(2)	D	$44.88	11,553.15	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: Greg A. Milleman	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 Greg A. Milleman?

The filing reports that Greg A. Milleman, an officer of California Water Service Group (CWT), had company shares withheld and surrendered to satisfy tax withholding obligations arising from the vesting of restricted stock awards.

How many CWT shares were withheld for taxes in these transactions?

In total, 117 shares of California Water Service Group common stock were withheld and surrendered for taxes, consisting of 66 shares on December 5, 2025 and 51 shares on December 7, 2025.

What was the transaction price for the CWT shares withheld?

Both transactions used a price of $44.88 per share for the California Water Service Group common stock that was withheld and surrendered to cover tax obligations.

Why were shares of CWT surrendered by the reporting person?

The shares were withheld and surrendered to the issuer to satisfy tax withholding obligations that arose upon the vesting of restricted stock (RSA) awards granted on June 5, 2024 and March 7, 2023.

How many CWT shares does Greg A. Milleman own after these transactions?

After the reported tax withholding transactions, Greg A. Milleman directly beneficially owned 11,553.15 shares of California Water Service Group common stock.

What is Greg A. Milleman’s role at California Water Service Group?

Greg A. Milleman is reported as an officer of California Water Service Group, serving as VP Rates & Regulatory Affairs.

Is this CWT filing for a single insider or multiple insiders?

This Form 4 is indicated as being filed by one reporting person, namely Greg A. Milleman.