Martin A. Kropelnicki - 05 Dec 2025 Form 4 Insider Report for CALIFORNIA WATER SERVICE GROUP (CWT)

Role: Chairman President & CEO
Signature: By: /s/ Michelle R. Mortensen For: Martin A. Kropelnicki
Issuer symbol: CWT
Transactions as of: 05 Dec 2025
Net transactions value: -$39,360
Form type: 4
Filing time: 09 Dec 2025, 16:40:08 UTC
Previous filing: 09 Sep 2025
Next filing: 05 Mar 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
KROPELNICKI MARTIN A	Chairman President & CEO	1720 NORTH FIRST STREET, SAN JOSE	By: /s/ Michelle R. Mortensen For: Martin A. Kropelnicki	09 Dec 2025	0001222882

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	CWT	Common Stock	Tax liability	$22,081	-492	-0.35%	$44.88	139,639	05 Dec 2025	Direct	F1
transaction	CWT	Common Stock	Gift	$0	-3,000	-2.1%	$0.000000	136,639	05 Dec 2025	Direct	F2
transaction	CWT	Common Stock	Tax liability	$17,279	-385	-0.28%	$44.88	136,254	07 Dec 2025	Direct	F3

* 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	The transaction represents gift to donor-advised fund. This is not a market transaction, thus no price has been reported.
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 March 7, 2023.