Cal Water SVP uses 137 shares for tax withholding

California Water Service Group SVP Michael S. Mares Jr. reported two Form 4 transactions involving common stock used to cover tax obligations from vesting restricted stock awards.

Rhea-AI Filing Summary

California Water Service Group SVP Michael S. Mares Jr. reported two Form 4 transactions involving common stock used to cover tax obligations from vesting restricted stock awards. On June 5, 2026, 68 shares were withheld at $45.82 per share, leaving 8,387.6 shares held directly. On June 4, 2026, 69 shares were withheld at $45.24 per share. The footnotes specify these are shares surrendered to the issuer to satisfy tax withholding obligations from Restricted Stock (RSA) awards granted on March 4, 2025 and June 5, 2024, rather than open-market sales.

Insider Trade Summary

Exercise Price or Tax Liability: 137 shares

Exercise Price or Tax Liability 2 txns

Insider Mares Michael S JR

Role SVP Operations

Type	Security	Shares	Price	Value
Exercise Price or Tax Liability	Common Stock	68	$45.82	$3K
Exercise Price or Tax Liability	Common Stock	69	$45.24	$3K

Holdings After Transaction: Common Stock — 8,387.6 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. 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

Tax withholding on June 5, 2026: 68 shares at $45.82 Tax withholding on June 4, 2026: 69 shares at $45.24 Total shares withheld for taxes: 137 shares +1 more

4 metrics

Tax withholding on June 5, 2026 68 shares at $45.82 Common stock surrendered to satisfy tax obligations

Tax withholding on June 4, 2026 69 shares at $45.24 Common stock surrendered to satisfy tax obligations

Total shares withheld for taxes 137 shares Aggregate of June 4 and June 5, 2026 transactions

Shares held after latest transaction 8,387.6 shares Direct ownership after June 5, 2026 withholding

Key Terms

Restricted Stock (RSA) Award, tax withholding obligations, Common Stock, Form 4

4 terms

Restricted Stock (RSA) Award financial

"in connection with the vesting of Restricted Stock (RSA) Award granted on March 4,2025"

tax withholding obligations financial

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

Common Stock financial

"security_title": "Common Stock""

Common stock represents ownership shares in a company, giving investors a stake in its success and a say in important decisions through voting rights. It is the most common type of stock traded on markets and can provide income through dividends, as well as potential for value growth. For investors, holding common stock means sharing in the company’s profits and risks.

Form 4 regulatory

"INSIDER FILING DATA (Form 4):"

Form 4 is a official document that company insiders, such as executives or major shareholders, file with regulators whenever they buy or sell company shares. It provides transparency about how those with inside knowledge are trading, helping investors see if insiders are confident in the company's prospects or may be selling for personal reasons. This information can influence investor decisions by revealing insiders' perspectives on the company's value.

FAQ

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

What did CWT executive Michael S. Mares Jr. report in this Form 4?

He reported shares withheld for taxes, not open-market trading. Two transactions on June 4 and 5, 2026 surrendered 137 California Water Service Group common shares to cover tax obligations from vesting Restricted Stock (RSA) awards.

How many CWT shares were withheld for Michael Mares Jr.’s tax obligations?

A total of 137 common shares were withheld for tax obligations. One transaction covered 69 shares at $45.24, and another covered 68 shares at $45.82, both surrendered to the issuer instead of being sold on the open market.

Are the CWT Form 4 transactions open-market sales by the SVP?

No, the transactions are not open-market sales. The filing describes them as shares withheld and surrendered to California Water Service Group to satisfy tax withholding obligations arising from vesting Restricted Stock (RSA) awards granted in 2024 and 2025.

How many CWT shares does Michael Mares Jr. hold after these Form 4 transactions?

After the June 5, 2026 tax-withholding transaction, he holds 8,387.6 California Water Service Group common shares directly. This figure reflects his position following the surrender of 68 shares to satisfy tax obligations from a vesting restricted stock award.

What awards caused the CWT tax-withholding share surrenders?

The share surrenders stem from Restricted Stock (RSA) awards. Footnotes state taxes arose from awards granted on June 5, 2024 and March 4, 2025, whose vesting triggered the need to withhold and surrender California Water Service Group shares.

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

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Accepted by SEC EDGAR 06/08/2026 - 05:36 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^*

Mares Michael S JR

(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 Operations

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		69(1)	D	$45.24	8,455.6	D
Common Stock	06/05/2026		F		68(2)	D	$45.82	8,387.6	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. 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 S Mares, Jr	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)