Michelle R. Mortensen - 05 Dec 2025 Form 4 Insider Report for CALIFORNIA WATER SERVICE GROUP (CWT)

Role: VP Corp Sect & Chief of Staff
Signature: By: /s/ Michelle R. Mortensen For: Michelle R. Mortensen
Issuer symbol: CWT
Transactions as of: 05 Dec 2025
Net transactions value: -$5,834
Form type: 4
Filing time: 09 Dec 2025, 17:09:38 UTC
Previous filing: 09 Sep 2025
Next filing: 23 Dec 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Mortensen Michelle R	VP Corp Sect & Chief of Staff	1720 NORTH FIRST STREET, SAN JOSE	By: /s/ Michelle R. Mortensen For: Michelle R. Mortensen	09 Dec 2025	0001629473

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	CWT	Common Stock	Tax liability	$3,276	-73	-0.58%	$44.88	12,493	05 Dec 2025	Direct	F1
transaction	CWT	Common Stock	Tax liability	$2,558	-57	-0.46%	$44.88	12,436	07 Dec 2025	Direct	F2

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
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 June 5, 2024.
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 March 7, 2023.