Cal Water senior VP sells 740 shares

California Water Service Group senior vice president Michael B. Luu sold 739.848 shares of common stock in an open-market transaction.

Rhea-AI Filing Summary

California Water Service Group senior vice president Michael B. Luu sold 739.848 shares of common stock in an open-market transaction. The shares were sold at an average price of $44.53 per share, in multiple trades priced between $44.53 and $44.21. After the sale, he directly holds 23,654.887 shares of California Water Service Group common stock, so this represents a relatively small portion of his overall reported holdings.

Insider Trade Summary

Net Seller: 739.848 shares

Net Sell 1 txn

Insider Luu Michael B

Role Sr. VP Corp Svcs & Chief Risk

Sold 739.848 shs ($33K)

Type	Security	Shares	Price	Value
Sale	Common Stock	739.848	$44.53	$33K

Holdings After Transaction: Common Stock — 23,654.887 shares (Direct)

Footnotes (1)

1. F1. The sale of 739.848 shares in multiple transactions with share price between $44.53 and $44.21 with an average price of $44.53. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or security holder of the issuer full information regarding the number of shares and price at which the transaction was effected.

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 an open-market sale of 739.848 shares of California Water Service Group common stock. The sale occurred in multiple transactions on March 20, 2026, and was disclosed as a standard non-derivative stock sale.

At what price did CWT executive Michael Luu sell his shares?

The reported sale had an average price of $44.53 per share, with individual trades executed between $44.53 and $44.21. These prices reflect the range of transaction values disclosed for the 739.848 shares sold on March 20, 2026.

How many CWT shares does Michael Luu hold after this reported sale?

Following the reported sale, Michael B. Luu directly holds 23,654.887 shares of California Water Service Group common stock. This remaining position is disclosed in the Form 4 as his direct ownership after the March 20, 2026 transaction.

What role does Michael Luu hold at California Water Service Group (CWT)?

Michael B. Luu is identified as Senior Vice President of Corporate Services and Chief Risk Officer at California Water Service Group. His role is listed in the insider filing as an executive officer rather than a director or major shareholder.

Were there any derivative securities involved in this CWT Form 4 filing?

No derivative securities were reported in this filing. The Form 4 shows only a non-derivative transaction involving common stock, and the derivative summary section indicates zero derivative transactions or remaining derivative positions for this report.

How is the nature of Michael Luu’s ownership of CWT shares described?

The filing classifies Michael B. Luu’s ownership as direct, coded as “D” for direct ownership. There is no separate entity or indirect ownership structure mentioned, and no footnotes disclaiming his beneficial ownership of the reported common stock.

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

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Accepted by SEC EDGAR 03/24/2026 - 05:11 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)
	Sr. VP Corp Svcs & Chief Risk

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
03/20/2026

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	03/20/2026		S		739.848(1)	D	$44.53	23,654.887	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. The sale of 739.848 shares in multiple transactions with share price between $44.53 and $44.21 with an average price of $44.53. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or security holder of the issuer full information regarding the number of shares and price at which the transaction was effected.

Remarks:

	/s/ Michelle R Mortensen on behalf of Michael B Luu	03/24/2026
	** 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)