Thomas A Scanlon - 05 Mar 2026 Form 4 Insider Report for CALIFORNIA WATER SERVICE GROUP (CWT)

Role: VP, Corporate Controller & CAO
Signature: By: /s/ Michelle R. Mortensen For: Thomas A Scanlon
Issuer symbol: CWT
Transactions as of: 05 Mar 2026
Net transactions value: $0
Form type: 4
Filing time: 09 Mar 2026, 18:26:57 UTC
Previous filing: 05 Mar 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Scanlon Thomas A	VP, Corporate Controller & CAO	1720 NORTH FIRST STREET, SAN JOSE	By: /s/ Michelle R. Mortensen For: Thomas A Scanlon	09 Mar 2026	0001958895

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	CWT	Common Stock	Tax liability		-34	-0.62%	$45.78^*	5,487	05 Mar 2026	Direct	F1
transaction	CWT	Common Stock	Award		+548	+10%	$0.000000^*	6,035	07 Mar 2026	Direct	F2
transaction	CWT	Common Stock	Tax liability		-226	-3.7%	$45.59^*	5,809	07 Mar 2026	Direct	F3
transaction	CWT	Common Stock	Tax liability		-26	-0.45%	$45.59^*	5,783	07 Mar 2026	Direct	F1

* 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 by and surrendered to the Issuer to satisfy the tax withholding obligations that arose in connection with the vesting of the Restricted Stock Award (RSA)
F2	The reporting person was granted a Performance Stock Unit (PSU) award on 3/7/2023. The PSU vested in full based on the satisfaction of certain performance criteria approved by the Board of Directors. The performance criteria was met resulting in 46% payout of the original goal
F3	Represents the number of shares withheld by and surrendered to the Issuer to satisfy the tax withholding obligations that arose in connection with the vesting of a Performance Stock Unit (PSU) Award.