California Water HR chief has shares withheld for taxes

California Water Service Group’s VP and Chief Human Resource Officer, Kristan A. Hamner, reported a routine tax-related share disposition.

Rhea-AI Filing Summary

California Water Service Group’s VP and Chief Human Resource Officer, Kristan A. Hamner, reported a routine tax-related share disposition. On the vesting of a Restricted Stock (RSA) award granted on March 4, 2025, 41 shares of common stock were withheld and surrendered to the company to satisfy tax withholding obligations at a price of $45.24 per share. After this withholding, Hamner directly holds 3,003.819 shares of California Water Service Group common stock, which includes shares acquired through the Employee Stock Purchase Program.

Insider Trade Summary

Exercise Price or Tax Liability: 41 shares

Exercise Price or Tax Liability 1 txn

Insider HAMNER KRISTAN A

Role VP, Chief Human Resource Offcr

Type	Security	Shares	Price	Value
Exercise Price or Tax Liability	Common Stock	41	$45.24	$2K

Holdings After Transaction: Common Stock — 3,003.819 shares (Direct)

Footnotes (2)

1. F1. 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 4,2025
2. F2. Includes shares acquired through the Employee Stock Purchase Program (ESPP).

Key Figures

Shares withheld for taxes: 41 shares Withholding price per share: $45.24 per share Shares held after transaction: 3,003.819 shares +1 more

4 metrics

Shares withheld for taxes 41 shares Withheld to satisfy tax obligations on RSA vesting

Withholding price per share $45.24 per share Value assigned to shares withheld on June 4, 2026

Shares held after transaction 3,003.819 shares Direct holdings after tax-withholding disposition

Tax-withholding transactions 1 transaction, 41 shares Form 4 transaction summary for this filing

Key Terms

Restricted Stock (RSA) Award, tax withholding obligations, Employee Stock Purchase Program (ESPP)

3 terms

Restricted Stock (RSA) Award financial

"vesting of Restricted Stock (RSA) Award granted on March 4,2025"

tax withholding obligations financial

"withheld and surrendered to the issuer to satisfy the tax withholding obligations"

Employee Stock Purchase Program (ESPP) financial

"Includes shares acquired through the Employee Stock Purchase Program (ESPP)."

FAQ

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

What insider transaction did CWT’s Kristan A. Hamner report?

Kristan A. Hamner reported a tax-related share disposition. 41 shares of California Water Service Group common stock were withheld and surrendered to the company to cover tax obligations from a Restricted Stock award vesting.

Was the CWT insider transaction an open-market sale or a tax withholding?

The CWT insider transaction was a tax withholding, not an open-market sale. Shares were withheld and surrendered to the issuer solely to satisfy tax obligations arising from the vesting of a Restricted Stock (RSA) award.

How many CWT shares were withheld for taxes from Kristan Hamner’s award?

A total of 41 shares of California Water Service Group common stock were withheld. These shares were surrendered to cover tax withholding obligations tied to the vesting of a Restricted Stock (RSA) award granted on March 4, 2025.

How many CWT shares does Kristan Hamner hold after the reported transaction?

After the tax withholding transaction, Kristan Hamner directly holds 3,003.819 shares of California Water Service Group common stock. This figure includes shares acquired through the company’s Employee Stock Purchase Program.

What triggered the tax-withholding share disposition for CWT’s Kristan Hamner?

The tax-withholding share disposition was triggered by the vesting of a Restricted Stock (RSA) award granted on March 4, 2025. Share withholding is a standard method to satisfy tax obligations when equity awards vest.

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

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Accepted by SEC EDGAR 06/08/2026 - 05:20 PM Learn about SEC filing dates

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^*

HAMNER KRISTAN A

(Last) (First) (Middle)

1720 NORTH FIRST STREET

(Street)

SAN JOSE CALIFORNIA 95112

(City) (State) (Zip)

UNITED STATES

(Country)

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, Chief Human Resource Offcr

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
06/04/2026

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

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

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

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	06/04/2026		F		41(1)	D	$45.24	3,003.819(2)	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 March 4,2025

2. Includes shares acquired through the Employee Stock Purchase Program (ESPP).

	By: /s/ Michelle R. Mortensen For: Kristan Hamner	06/08/2026
	** 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.
* Form 4: SEC 1474 (03-26)