California Water SVP has 136 shares withheld for tax

CWT’s SVP Operations had small blocks of vested restricted stock withheld to satisfy tax liabilities, with no open-market sales reported.

Rhea-AI Filing Summary

CALIFORNIA WATER SERVICE GROUP (CWT) reported that Michael S. Mares Jr., Senior Vice President of Operations, had shares of common stock withheld to cover tax obligations arising from restricted stock vesting. On September 4, 2026, 69 shares were withheld at $50.03 per share for an RSA granted March 4, 2025, and on September 5, 2026, a further 67 shares were withheld at $50.03 per share for an RSA granted June 5, 2024. These transactions are reported as dispositions to the issuer for payment of tax liability, not open-market sales, and no Rule 10b5-1 trading plan is reported.

Insider Trade Summary

Tax Withholding: 136 shares

Tax Withholding 2 txns

Insider Mares Michael S JR

Role SVP Operations

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock F2	67	$50.03	$3K
Tax Withholding	Common Stock F1	69	$50.03	$3K

Holdings After Transaction: Common Stock — 8,251.915 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

Shares withheld September 4, 2026: 69 shares Shares withheld September 5, 2026: 67 shares Total shares withheld for tax: 136 shares +1 more

4 metrics

Shares withheld September 4, 2026 69 shares Common Stock withheld and surrendered to issuer for tax withholding on RSA granted March 4, 2025

Shares withheld September 5, 2026 67 shares Common Stock withheld and surrendered to issuer for tax withholding on RSA granted June 5, 2024

Total shares withheld for tax 136 shares Aggregate of both tax-withholding dispositions in this Form 4

Tax-withholding price per share $50.03 per share Applied to both September 4 and September 5, 2026 tax-withholding transactions

Key Terms

Restricted Stock (RSA) Award, tax withholding obligations, withheld and surrendered to the issuer, Rule 10b5-1

4 terms

Restricted Stock (RSA) Award financial

"in connection with the vesting of Restricted Stock (RSA) Award granted"

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"

Rule 10b5-1 regulatory

"affirms no Rule 10b5-1 trading plan checkbox is selected"

Rule 10b5-1 is a regulation that allows company insiders to buy or sell their shares at predetermined times, even if they have access to non-public information. It acts like setting a schedule in advance for transactions, helping prevent accusations of unfair trading. This rule provides a way for insiders to plan trades transparently, giving investors confidence that these transactions are not based on hidden information.

FAQ

What insider transactions did CWT’s SVP Operations report on this Form 4?

Michael S. Mares Jr., CWT’s SVP Operations, reported two tax-withholding transactions where a total of 136 common shares were withheld and surrendered to the issuer to satisfy tax obligations from vesting restricted stock awards.

Did the CWT insider sell shares on the open market in this Form 4?

No. The Form 4 reports no open-market sales. Instead, 69 shares on September 4, 2026, and 67 shares on September 5, 2026, were withheld and surrendered to the issuer solely to satisfy tax withholding obligations on vesting restricted stock.

What prices were used for the CWT tax-withholding share dispositions?

Both tax-withholding dispositions for CWT common stock used a price of $50.03 per share, applied to 69 shares on September 4, 2026, and 67 shares on September 5, 2026, in connection with vested restricted stock awards.

Which CWT equity awards triggered these tax-withholding transactions?

The 69-share withholding on September 4, 2026, related to a Restricted Stock (RSA) Award granted on March 4, 2025. The 67-share withholding on September 5, 2026, related to a Restricted Stock (RSA) Award granted on June 5, 2024.

Was a Rule 10b5-1 trading plan involved in these CWT insider transactions?

No. The filing’s Rule 10b5-1 checkbox is not marked, and no footnote states that the transactions were made under a Rule 10b5-1 trading plan. The transactions are characterized only as payments of tax liability by withholding shares.

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Available on EDGAR 09/08/2026 - 04:31 PM Accepted by SEC EDGAR 09/08/2026 - 04:30 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)
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		69(1)	D	$50.03	8,318.915	D
Common Stock	09/05/2026		F		67(2)	D	$50.03	8,251.915	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	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)