CWT (CWT) SVP Michael Luu awarded 1,650 RSAs, surrenders 309 shares for taxes

Rhea-AI Filing Summary

California Water Service Group senior vice president Michael B. Luu reported two equity-related transactions in company common stock. On March 3, 2026, he acquired 1,650 shares as a restricted stock award at a stated price of $0.00 per share under the company’s equity incentive plan. According to the footnotes, one-third of this restricted stock vests on March 3, 2027, with the remaining two-thirds vesting quarterly over the following 24 months.

On March 4, 2026, 309 shares were disposed of in a tax-withholding transaction at $46.99 per share, representing shares surrendered to the issuer to cover tax obligations from a prior restricted stock award that vested. After these transactions, Luu directly held 24,043.735 shares of common stock, including shares acquired through dividend reinvestment and the employee stock purchase plan.

Insider Trade Summary

2 transactions reported

Mixed 2 txns

Insider Luu Michael B

Role SVP Corp Svce & Chief Risk Of

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock	309	$46.99	$15K
Grant/Award	Common Stock	1,650	$0.00	--

Holdings After Transaction: Common Stock — 24,043.735 shares (Direct)

Footnotes (1)

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. Includes shares acquired through Dividend Reinvestment and Employee Stock Purchase Plan 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

Form 4 Insider Transactions: What Each Field Means →

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
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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 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)
	SVP Corp Svce & Chief Risk Of

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	24,352.735(2)	D
Common Stock	03/04/2026		F		309(3)	D	$46.99	24,043.735	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 Dividend Reinvestment and Employee Stock Purchase Plan

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: Michael B Luu	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.
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 transactions did CWT executive Michael Luu report on this Form 4?

Michael B. Luu reported a restricted stock award of 1,650 California Water Service Group shares on March 3, 2026, and a tax-withholding disposition of 309 shares on March 4, 2026. Both transactions involved common stock and were reported as direct ownership.

Was the CWT insider transaction a stock sale by Michael Luu on the open market?

No, the Form 4 shows no open-market sale. The 309-share disposition on March 4, 2026, was a tax-withholding transaction, where shares were surrendered to the issuer to satisfy tax obligations from a previously granted restricted stock award.

How many CWT shares did Michael Luu acquire as a restricted stock award?

He acquired 1,650 shares of California Water Service Group common stock as a restricted stock grant on March 3, 2026. The award was granted at a stated price of $0.00 per share under the company’s equity incentive plan, subject to multi-year vesting.

What are the vesting terms of Michael Luu’s new CWT restricted stock grant?

The 1,650 restricted shares granted on March 3, 2026, vest with one-third on March 3, 2027. The remaining two-thirds vest quarterly over the succeeding 24 months, according to the equity incentive plan footnote in the Form 4 filing.

How many California Water Service Group shares does Michael Luu hold after these transactions?

Following the reported March 2026 transactions, Michael B. Luu directly holds 24,043.735 shares of California Water Service Group common stock. This figure includes shares accumulated through the dividend reinvestment program and the employee stock purchase plan, as noted in the filing footnotes.

What does the tax-withholding disposition in the CWT Form 4 represent?

The 309-share tax-withholding disposition represents shares withheld and surrendered to California Water Service Group to cover tax obligations. These obligations arose from the vesting of a restricted stock award originally granted on March 4, 2025, rather than a discretionary sale by the executive.