CWT executive shares withheld for tax on awards

CALIFORNIA WATER SERVICE GROUP senior vice president Michael B. Luu reported routine share withholdings to cover taxes on vested stock awards.

Rhea-AI Filing Summary

CALIFORNIA WATER SERVICE GROUP senior vice president Michael B. Luu reported routine share withholdings to cover taxes on vested stock awards. On June 4 and 5, 2026, a total of 139 shares of common stock were withheld and surrendered to the company at prices around the mid-$40s per share to satisfy tax withholding obligations tied to Restricted Stock Awards granted in 2024 and 2025. After these non-market tax-withholding dispositions, Luu directly holds about 23,806.765 shares of common stock, which includes shares acquired through the Employee Stock Purchase Program.

Insider Trade Summary

Exercise Price or Tax Liability: 139 shares

Exercise Price or Tax Liability 2 txns

Insider Luu Michael B

Role SVP Corp Svce & Chief Risk Of

Type	Security	Shares	Price	Value
Exercise Price or Tax Liability	Common Stock	69	$45.82	$3K
Exercise Price or Tax Liability	Common Stock	70	$45.24	$3K

Holdings After Transaction: Common Stock — 23,806.765 shares (Direct)

Footnotes (3)

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).
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 June 5, 2024.

Key Figures

Shares withheld June 4, 2026: 70 shares Shares withheld June 5, 2026: 69 shares Total shares withheld for taxes: 139 shares +3 more

6 metrics

Shares withheld June 4, 2026 70 shares Tax-withholding disposition at $45.24 per share

Shares withheld June 5, 2026 69 shares Tax-withholding disposition at $45.82 per share

Total shares withheld for taxes 139 shares Sum of June 4 and June 5, 2026 F-code transactions

Post-transaction holdings 23,806.765 shares Common stock held directly after June 5, 2026 transaction

June 4 disposition price $45.24/share Value for 70 withheld shares on June 4, 2026

June 5 disposition price $45.82/share Value for 69 withheld shares on June 5, 2026

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 with the vesting"

withheld and surrendered to the issuer financial

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

FAQ

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

What insider transaction did CWT executive Michael Luu report on this Form 4?

Michael B. Luu reported shares withheld for taxes, not an open-market sale. On June 4 and 5, 2026, 139 California Water Service Group common shares were surrendered to the company to satisfy tax obligations from vesting Restricted Stock Awards.

How many CWT shares were withheld for Michael Luu’s tax obligations?

A total of 139 CWT common shares were withheld for taxes. The Form 4 shows 70 shares on June 4, 2026 and 69 shares on June 5, 2026, all surrendered to the issuer to cover tax withholding obligations from vested stock awards.

At what prices were Michael Luu’s CWT tax-withholding share dispositions valued?

The tax-withholding dispositions used share values in the mid-$40s. The Form 4 reports 70 shares at $45.24 per share on June 4, 2026 and 69 shares at $45.82 per share on June 5, 2026 for California Water Service Group common stock.

How many CWT shares does Michael Luu hold after these tax-withholding transactions?

Following the reported transactions, Michael Luu directly holds 23,806.765 CWT common shares. This balance includes shares acquired through the company’s Employee Stock Purchase Program, as noted in the Form 4 footnotes accompanying the reported tax-withholding dispositions.

Were Michael Luu’s CWT transactions open-market sales or related to stock award vesting?

The transactions were related to stock award vesting, not open-market sales. The Form 4 states the shares were withheld and surrendered to California Water Service Group to satisfy tax withholding obligations arising from vesting Restricted Stock Awards granted in 2024 and 2025.

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

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Accepted by SEC EDGAR 06/08/2026 - 05:31 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^*

Luu Michael B

(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)
	SVP Corp Svce & Chief Risk Of

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		70(1)	D	$45.24	23,875.765(2)	D
Common Stock	06/05/2026		F		69(3)	D	$45.82	23,806.765	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).

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 June 5, 2024.

	By: /s/ Michelle R. Mortensen For: Michael B Luu	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)