California Water Service (NYSE: CWT) discloses insider tax share withholding

Rhea-AI Filing Summary

California Water Service Group reported routine insider transactions for executive Elissa Y. Ouyang, VP Facilities Fleet & Procure. On December 5, 2025, 66 shares of common stock were withheld at $44.88 per share, and on December 7, 2025, an additional 52 shares were withheld at the same price. Both transactions are coded "F," meaning the shares were surrendered to the company to cover tax withholding tied to the vesting of prior Restricted Stock Awards granted on June 5, 2024 and March 7, 2023. After these transactions, Ouyang beneficially owned 13,445.061 shares of common stock, held directly, which includes shares acquired through the Employee Stock Purchase Program.

Insider Trade Summary

2 transactions reported

Mixed 2 txns

Insider Ouyang Elissa Y

Role VP Facilities Fleet & Procure

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock	52	$44.88	$2K
Tax Withholding	Common Stock	66	$44.88	$3K

Holdings After Transaction: Common Stock — 13,445.061 shares (Direct)

Footnotes (1)

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 June 5, 2024. 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 7, 2023. Includes shares acquired through the Employee Stock Purchase Program.

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
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^*

Ouyang Elissa Y

(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)
	VP Facilities Fleet & Procure

3. Date of Earliest Transaction (Month/Day/Year)
12/05/2025

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	12/05/2025		F		66(1)	D	$44.88	13,497.061	D
Common Stock	12/07/2025		F		52(2)	D	$44.88	13,445.061(3)	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 June 5, 2024.

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 March 7, 2023.

3. Includes shares acquired through the Employee Stock Purchase Program.

	By: /s/ Michelle R. Mortensen For: Elissa Y. Ouyang	12/09/2025
	** 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 transaction did California Water Service Group (CWT) report?

The company reported that executive Elissa Y. Ouyang had company stock withheld and surrendered in two transactions coded "F" on December 5, 2025 and December 7, 2025 to cover tax obligations from vesting restricted stock awards.

Who is the reporting person in this California Water Service Group (CWT) Form 4?

The reporting person is Elissa Y. Ouyang, who serves as VP Facilities Fleet & Procure at California Water Service Group.

How many CWT shares were withheld in the reported insider transactions?

On December 5, 2025, 66 shares of common stock were withheld at $44.88 per share, and on December 7, 2025, 52 shares were withheld at the same price, both to satisfy tax withholding requirements.

What was Elissa Ouyang’s CWT share ownership after these transactions?

Following the reported tax-withholding transactions, Elissa Ouyang beneficially owned 13,445.061 shares of California Water Service Group common stock, held directly.

Why were California Water Service Group (CWT) shares surrendered in these Form 4 transactions?

The filing explains that the shares were withheld and surrendered to the issuer to satisfy tax withholding obligations arising from the vesting of Restricted Stock (RSA) Awards granted on June 5, 2024 and March 7, 2023.

Does Elissa Ouyang’s reported ownership in CWT include shares from an employee stock plan?

Yes. The filing notes that her beneficial ownership figure includes shares acquired through the Employee Stock Purchase Program.