CWT VP gets 1,650 restricted shares, 190 withheld

California Water Service Group VP and Chief Human Resources Officer Kristan A. Hamner received a grant of 1,650 shares of restricted common stock on March 3, 2026.

Rhea-AI Filing Summary

California Water Service Group VP and Chief Human Resources Officer Kristan A. Hamner received a grant of 1,650 shares of restricted common stock on March 3, 2026. On March 4, 2026, 190 shares were disposed of at $46.99 per share to cover tax withholding from a prior award. Following these transactions, direct holdings total 2,943.457 shares, including shares acquired through the Employee Stock Purchase Program.

Insider Trade Summary

2 transactions reported

Mixed 2 txns

Insider HAMNER KRISTAN A

Role VP, Chief Human Resource Offcr

Type	Security	Shares	Price	Value
Exercise Price or Tax Liability	Common Stock	190	$46.99	$9K
Grant/Award	Common Stock	1,650	$0.00	$0.00

Holdings After Transaction: Common Stock — 2,943.457 shares (Direct)

Footnotes (3)

1. F1. Restricted stock granted on 3/3/2026 pursuant to the California Water Service Group equity incentive plan in a transaction exempt under Rule 16-b-3 vests with one-third on March 3, 2027, and with the remaining 2/3 vesting quarterly over the succeeding 24 months.
2. F2. Includes shares acquired through the Employee Stock Purchase Program.
3. F3. 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

FAQ

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What insider transactions did CWT executive Kristan Hamner report on this Form 4?

Kristan A. Hamner reported two transactions: a grant of 1,650 restricted shares of California Water Service Group common stock on March 3, 2026, and the disposition of 190 shares on March 4, 2026 to satisfy tax withholding obligations related to a prior restricted stock award.

How many California Water Service Group shares does Kristan Hamner own after these transactions?

After the reported transactions, Kristan A. Hamner directly holds 2,943.457 shares of California Water Service Group common stock. This total includes shares acquired through the company’s Employee Stock Purchase Program, as noted in the filing footnotes outlining the composition of the reported share balance.

What are the vesting terms of the 1,650 restricted CWT shares granted to Kristan Hamner?

The 1,650 restricted shares granted on March 3, 2026 vest over time. One-third vests on March 3, 2027, and the remaining two-thirds vest quarterly over the following 24 months under the California Water Service Group equity incentive plan, subject to plan conditions.

Why were 190 CWT shares disposed of at $46.99 in this Form 4?

The 190 shares disposed of at $46.99 per share represent shares withheld and surrendered to California Water Service Group to satisfy tax withholding obligations arising from the vesting of a restricted stock award originally granted on March 4, 2025, rather than an open-market sale.

Were any of Kristan Hamner’s CWT shares purchased on the open market in these transactions?

No open-market purchases or sales are reported. The Form 4 shows a grant of 1,650 restricted shares at a price of $0.00 and a tax-withholding disposition of 190 shares to the issuer, consistent with equity compensation and related tax settlement rather than trading activity.

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Accepted by SEC EDGAR 03/05/2026 - 08:03 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 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, Chief Human Resource Offcr

3. Date of Earliest Transaction (Month/Day/Year)
03/03/2026

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	03/03/2026		A		1,650(1)	A	$0.0	3,133.457(2)	D
Common Stock	03/04/2026		F		190(3)	D	$46.99	2,943.457	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. Restricted stock granted on 3/3/2026 pursuant to the California Water Service Group equity incentive plan in a transaction exempt under Rule 16-b-3 vests with one-third on March 3, 2027, and with the remaining 2/3 vesting quarterly over the succeeding 24 months.

2. Includes shares acquired through the Employee Stock Purchase Program.

3. 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

	By: /s/ Michelle R. Mortensen For: Kristan Hamner	03/05/2026
	** 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.
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