Form 4 for CWT CALIFORNIA WATER SERVICE GROUP

Accepted 2026-03-09 00:00:00 ET · period of report 2026-03-05 · accession 0001629475-26-000004 · SEC index · Original document

Summary rows

Aggregated the way they appear in lists: one row per insider, transaction code and security table.

X	Filed	Traded	Ticker	Insider	Title	Type	Price	Qty	Owned	ΔOwn	Value
M	2026-03-09	2026-03-05+	CWT	Dean Shannon C	SVP, Cust Svc, Chief Sust	F - Tax	$45.61	-673	23.5K	-3%	-$30.7K
	2026-03-09	2026-03-07	CWT	Dean Shannon C	SVP, Cust Svc, Chief Sust	A - Grant	$0.00	+900	24.4K	+4%	$0

Purchase Sale Sale after option exercise All abbreviations

#	Table	Security	Date	Code	A/D	Shares	Price	Owned after	Own	Exercise / expiry	Underlying	Footnotes
1	Common	Common Stock	2026-03-07	F	D	62	$45.59	23,816.27	D	—	—	(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)
2	Common	Common Stock	2026-03-07	F	D	531	$45.59	23,878.27	D	—	—	(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.
3	Common	Common Stock	2026-03-05	F	D	80	$45.78	23,509.27	D	—	—	(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)
4	Common	Common Stock	2026-03-07	A	A	900	$0.00	24,409.27	D	—	—	(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