California Water officer has 42 shares withheld

CWT’s chief human resource officer reported 42 shares withheld for taxes on vested restricted stock, leaving 2,979.22 shares held directly.

Rhea-AI Filing Summary

CALIFORNIA WATER SERVICE GROUP (CWT) reports that officer Kristan A. Hamner, Vice President and Chief Human Resource Officer, had 42 shares of common stock withheld on September 4, 2026 to satisfy tax withholding obligations arising from the vesting of a Restricted Stock (RSA) Award granted on March 4, 2025. The shares were surrendered to the issuer and the reporting person now holds 2,979.22 shares of common stock directly, which include shares acquired through the Employee Stock Purchase Program (ESPP).

Insider Trade Summary

Tax Withholding: 42 shares

Tax Withholding 1 txn

Insider HAMNER KRISTAN A

Role VP, Chief Human Resource Offcr

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock F1, F2	42	$50.03	$2K

Holdings After Transaction: Common Stock — 2,979.22 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 tax: 42 shares Transaction price per share: $50.03 per share Shares held after transaction: 2,979.22 shares +3 more

6 metrics

Shares withheld for tax 42 shares Common stock surrendered on September 4, 2026 to satisfy tax withholding obligations

Transaction price per share $50.03 per share Price associated with the 42 withheld shares on September 4, 2026

Shares held after transaction 2,979.22 shares Direct holdings of CWT common stock by Kristan A. Hamner following the transaction

ExercisePriceOrTaxLiabilityShares 42 shares Shares reported as delivered or withheld for payment of tax liability

RSA grant date March 4, 2025 Grant date of the Restricted Stock (RSA) Award that vested and triggered tax withholding

Transaction date September 4, 2026 Date of the tax-withholding disposition reported on Form 4

Key Terms

Restricted Stock (RSA) Award, Employee Stock Purchase Program (ESPP), tax withholding obligations, withheld and surrendered to the issuer

4 terms

Restricted Stock (RSA) Award financial

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

Employee Stock Purchase Program (ESPP) financial

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

tax withholding obligations financial

"to satisfy the tax withholding obligations that arose in connection"

withheld and surrendered to the issuer financial

"Represents the number of shares withheld and surrendered to the issuer"

FAQ

What insider transaction did CWT disclose for Kristan A. Hamner?

CWT disclosed that 42 shares of common stock were withheld from Kristan A. Hamner on September 4, 2026 to satisfy tax withholding obligations related to the vesting of a Restricted Stock (RSA) Award granted on March 4, 2025.

Was the CWT Form 4 transaction a market sale or a tax withholding?

The Form 4 reports a tax-withholding disposition, not a market sale. 42 shares of CWT common stock were surrendered to the issuer to cover tax withholding obligations triggered by the vesting of a Restricted Stock (RSA) Award.

How many CWT shares does Kristan A. Hamner hold after this transaction?

After the September 4, 2026 transaction, Kristan A. Hamner holds 2,979.22 shares of CWT common stock directly. A footnote states that this total includes shares acquired through the Employee Stock Purchase Program (ESPP).

What price per share is associated with the CWT tax-withholding transaction?

The transaction reflects a price of $50.03 per share for the 42 shares withheld on September 4, 2026 to satisfy tax withholding obligations related to the vesting of a Restricted Stock (RSA) Award.

Was the CWT insider transaction made under a Rule 10b5-1 trading plan?

The filing indicates the Rule 10b5-1 checkbox is not affirmed for this Form 4, and there is no footnote stating that the September 4, 2026 tax-withholding transaction was made pursuant to a Rule 10b5-1 trading plan.

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Available on EDGAR 09/08/2026 - 04:15 PM Accepted by SEC EDGAR 09/08/2026 - 04:14 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)
09/04/2026

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	09/04/2026		F		42(1)	D	$50.03	2,979.22(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 A Hamner	09/08/2026
	** 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)