California Water VP has 138 shares withheld for tax

An executive of CWT reported small share withholdings used to cover taxes on vesting restricted stock awards, not open-market sales.

Rhea-AI Filing Summary

CALIFORNIA WATER SERVICE GROUP (CWT) reports that officer Michael B. Luu, Senior Vice President Corporate Services and Chief Risk Officer, had a total of 138 shares of common stock withheld on September 4–5, 2026 to satisfy tax withholding obligations from vesting restricted stock awards. These dispositions were payments of tax liabilities by delivering or withholding shares and were not recorded as open‑market sales. No Rule 10b5‑1 trading plan is reported.

Insider Trade Summary

Tax Withholding: 138 shares

Tax Withholding 2 txns

Insider Luu Michael B

Role SVP Corp Svce & Chief Risk Of

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock F3	68	$50.03	$3K
Tax Withholding	Common Stock F1, F2	70	$50.03	$4K

Holdings After Transaction: Common Stock — 23,743.547 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 September 4, 2026: 70 shares Shares withheld September 5, 2026: 68 shares Total shares withheld for tax obligations: 138 shares +1 more

4 metrics

Shares withheld September 4, 2026 70 shares Common stock withheld to satisfy tax withholding obligations from vesting RSA awarded March 4, 2025

Shares withheld September 5, 2026 68 shares Common stock withheld to satisfy tax withholding obligations from vesting RSA awarded June 5, 2024

Total shares withheld for tax obligations 138 shares Sum of both Form 4 code F transactions reported for September 4–5, 2026

Per-share value used $50.03 per share Value applied to both tax-withholding dispositions of CWT common stock

Key Terms

Restricted Stock (RSA) Award, Employee Stock Purchase Program (ESPP), tax withholding obligations

3 terms

Restricted Stock (RSA) Award financial

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

Employee Stock Purchase Program (ESPP) financial

"Includes shares acquired through the Employee Stock Purchase Program (ESPP)."

tax withholding obligations financial

"shares withheld and surrendered to the issuer to satisfy the tax withholding obligations"

FAQ

What did CWT executive Michael B. Luu report in this Form 4 for CWT stock?

He reported that 138 shares of CWT common stock were withheld on September 4–5, 2026 to satisfy tax withholding obligations arising from vesting restricted stock awards, rather than being sold in the open market.

How many CWT shares were withheld on each date in this Form 4?

On September 4, 2026, 70 shares of CWT common stock were withheld. On September 5, 2026, an additional 68 shares were withheld. Both transactions are reported as payments of tax liabilities by delivering or withholding securities.

At what price were the CWT shares valued for the tax-withholding dispositions?

Both transactions used a value of $50.03 per share of CWT common stock for the 70 and 68 shares withheld to cover tax obligations linked to vesting restricted stock awards.

What awards triggered the CWT tax-withholding share dispositions reported by Luu?

The withholdings relate to vesting of Restricted Stock (RSA) Awards granted on June 5, 2024 and March 4, 2025, for which shares were withheld and surrendered to the issuer to satisfy associated tax withholding obligations.

Were Michael B. Luu’s CWT transactions under a Rule 10b5-1 trading plan?

No. The filing indicates no Rule 10b5-1 plan for these transactions. They are characterized as share withholdings to pay tax liabilities from vesting restricted stock awards, not pre-arranged open-market trades.

Does the Form 4 mention other CWT shares held by Michael B. Luu?

A footnote states that his holdings include shares acquired through the Employee Stock Purchase Program (ESPP), indicating some CWT shares were accumulated via the company’s ESPP, though an exact holding amount is not provided here.

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

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Available on EDGAR 09/08/2026 - 04:26 PM Accepted by SEC EDGAR 09/08/2026 - 04:26 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)
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		70(1)	D	$50.03	23,811.547(2)	D
Common Stock	09/05/2026		F		68(3)	D	$50.03	23,743.547	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	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)