CALIFORNIA WATER SERVICE GROUP (CWT)

Data as of Sep 8, 2026, from SEC Form 4 filings.

Net insider selling (90d)Watch CWT

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Latest CWT insider trades

Lester A. Snow - Director
Open-market sale$25K
Sep 1, 2026
Thomas M. Krummel - Director
Open-market sale$186K
Aug 13, 2026
Thomas A. Scanlon - Officer
Tax withholding / forfeiture$2K
Sep 4, 2026
Thomas A. Scanlon - Officer
Tax withholding / forfeiture$2K
Sep 5, 2026
Todd Kenneth Peters - Officer
Tax withholding / forfeiture$2K
Sep 4, 2026
Todd Kenneth Peters - Officer
Tax withholding / forfeiture$2K
Sep 5, 2026
Elissa Y. Ouyang - Officer
Tax withholding / forfeiture$3K
Sep 4, 2026
Elissa Y. Ouyang - Officer
Tax withholding / forfeiture$3K
Sep 5, 2026

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CWT key statistics

Key statistics for CWT are not available right now.

Filings (90d)

Form 4

Purchases (90d)

Sales (90d)

$211K

Market cap

CWT insider sentiment, last 90 days

How the dollar value of insider trades on Form 4 split between purchases and sales.

0% Buying100% Selling

2 insider sales totaling $211K and no purchases.

Most active CWT insiders in the last 90 days

About CALIFORNIA WATER SERVICE GROUP (CWT)

CALIFORNIA WATER SERVICE GROUP files with the SEC under CIK 0001035201 and is classified as water supply. We track it alongside the rest of the Utilities sector.

Sector: Utilities

SEC filings for CWT on EDGAR

CWT Form 4 activity by transaction type, last 90 days

Form 4 transaction type	Transactions	Shares	Total value
Open-market sale	2	4,200	$211K
Grant or award	1	446
Tax withholding / forfeiture	25	2,325

Dollar totals cover purchases and sales only (codes P and S). Grants, option exercises, gifts and tax withholding are counted in shares, because none of them is a trade at a market price.

CWT insider transactions (Form 4)

129 Form 4 filings on record, the earliest from Nov 25, 2024, newest first. Filing history page 1 of 3.

Date	Insider	Transaction	Security	Shares	Price	Value
Sep 4, 2026	Thomas A. Scanlon - Officer	Tax withholding / forfeiture	Common Stock	30^{footnote F1}	$50.03	$2K
Sep 5, 2026	Thomas A. Scanlon - Officer	Tax withholding / forfeiture	Common Stock	30^{footnote F3}	$50.03	$2K
Footnote F1 (shares): 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 4,2025 Footnote F3 (shares): 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.
Sep 4, 2026	Todd Kenneth Peters - Officer	Tax withholding / forfeiture	Common Stock	41^{footnote F1}	$50.03	$2K
Sep 5, 2026	Todd Kenneth Peters - Officer	Tax withholding / forfeiture	Common Stock	40^{footnote F2}	$50.03	$2K
Footnote F1 (shares): 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 4,2025 Footnote F2 (shares): 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.
Sep 4, 2026	Elissa Y. Ouyang - Officer	Tax withholding / forfeiture	Common Stock	68^{footnote F1}	$50.03	$3K
Sep 5, 2026	Elissa Y. Ouyang - Officer	Tax withholding / forfeiture	Common Stock	66^{footnote F2}	$50.03	$3K
Footnote F1 (shares): 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 4,2025 Footnote F2 (shares): 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.
Sep 4, 2026	Michelle R. Mortensen - Officer	Tax withholding / forfeiture	Common Stock	75^{footnote F1}	$50.03	$4K
Sep 5, 2026	Michelle R. Mortensen - Officer	Tax withholding / forfeiture	Common Stock	73^{footnote F2}	$50.03	$4K
Footnote F1 (shares): 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 4,2025 Footnote F2 (shares): 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.
Sep 4, 2026	Michael S. Mares Jr. - Officer	Tax withholding / forfeiture	Common Stock	69^{footnote F1}	$50.03	$3K
Sep 5, 2026	Michael S. Mares Jr. - Officer	Tax withholding / forfeiture	Common Stock	67^{footnote F2}	$50.03	$3K
Footnote F1 (shares): 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 4,2025 Footnote F2 (shares): 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.
Sep 4, 2026	James Patrick Lynch - Officer	Tax withholding / forfeiture	Common Stock	50^{footnote F1}	$50.03	$3K
Sep 5, 2026	James Patrick Lynch - Officer	Tax withholding / forfeiture	Common Stock	48^{footnote F2}	$50.03	$2K
Footnote F1 (shares): 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 4,2025 Footnote F2 (shares): 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.
Sep 4, 2026	Michael B. Luu - Officer	Tax withholding / forfeiture	Common Stock	70^{footnote F1}	$50.03	$4K
Sep 5, 2026	Michael B. Luu - Officer	Tax withholding / forfeiture	Common Stock	68^{footnote F3}	$50.03	$3K
Footnote F1 (shares): 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 4,2025 Footnote F3 (shares): 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.
Sep 4, 2026	Martin A. Kropelnicki - Officer	Tax withholding / forfeiture	Common Stock	505^{footnote F1}	$50.03	$25K
Sep 5, 2026	Martin A. Kropelnicki - Officer	Tax withholding / forfeiture	Common Stock	493^{footnote F2}	$50.03	$25K
Footnote F1 (shares): 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 4,2025 Footnote F2 (shares): 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.
Sep 5, 2026	Kenneth G. Jenkins - Officer	Tax withholding / forfeiture	Common Stock	38^{footnote F2}	$50.03	$2K
Sep 4, 2026	Kenneth G. Jenkins - Officer	Tax withholding / forfeiture	Common Stock	64^{footnote F1}	$50.03	$3K
Footnote F1 (shares): 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 4,2025 Footnote F2 (shares): 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.
Sep 4, 2026	Sophie Marwieh James - Officer	Tax withholding / forfeiture	Common Stock	51^{footnote F1}	$50.03	$3K
Sep 5, 2026	Sophie Marwieh James - Officer	Tax withholding / forfeiture	Common Stock	50^{footnote F3}	$50.03	$3K
Footnote F1 (shares): 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 4,2025 Footnote F3 (shares): 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.
Sep 4, 2026	Kristan A. Hamner - Officer	Tax withholding / forfeiture	Common Stock	42^{footnote F1}	$50.03	$2K
Footnote F1 (shares): 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 4,2025
Sep 4, 2026	Shannon C. Dean - Officer	Tax withholding / forfeiture	Common Stock	75^{footnote F1}	$50.03	$4K
Sep 5, 2026	Shannon C. Dean - Officer	Tax withholding / forfeiture	Common Stock	72^{footnote F3}	$50.03	$4K
Footnote F1 (shares): 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 4,2025 Footnote F3 (shares): 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.
Sep 4, 2026	Shawn C. Bunting - Officer	Tax withholding / forfeiture	Common Stock	71^{footnote F1}	$50.03	$4K
Sep 5, 2026	Shawn C. Bunting - Officer	Tax withholding / forfeiture	Common Stock	69^{footnote F2}	$50.03	$3K
Footnote F1 (shares): 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 4,2025 Footnote F2 (shares): 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.
Sep 1, 2026	Lester A. Snow - Director	Open-market sale	Common Stock	500	$50.21^{footnote F1}	$25K
Footnote F1 (price): This transaction was a single trade at a price of $50.21.
Aug 13, 2026	Thomas M. Krummel - Director	Open-market sale	Common Stock	3,700	$50.37	$186K
Aug 4, 2026	Gregory Dale Shimansky - Officer	Grant or award	Common Stock	446^{footnote F1}	$0.00	-
Footnote F1 (shares): Restricted stock granted on 8/4/2026 pursuant to the California Water Service Group equity incentive plan in a transaction exempt under Rule 16-b-3. RSA vests one-third on March 3, 2027 with the remaining 2/3 vesting quarterly over the succeeding 24 months.
Jun 4, 2026	Thomas A. Scanlon - Officer	Tax withholding / forfeiture	Common Stock	30^{footnote F1}	$45.24	$1K
Jun 5, 2026	Thomas A. Scanlon - Officer	Tax withholding / forfeiture	Common Stock	30^{footnote F2}	$45.82	$1K
Footnote F1 (shares): 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 4,2025 Footnote F2 (shares): 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.
Jun 4, 2026	Todd Kenneth Peters - Officer	Tax withholding / forfeiture	Common Stock	40^{footnote F1}	$45.24	$2K
Jun 5, 2026	Todd Kenneth Peters - Officer	Tax withholding / forfeiture	Common Stock	40^{footnote F2}	$45.82	$2K
Footnote F1 (shares): 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 4,2025 Footnote F2 (shares): 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.
Jun 4, 2026	Elissa Y. Ouyang - Officer	Tax withholding / forfeiture	Common Stock	67^{footnote F1}	$45.24	$3K
Jun 5, 2026	Elissa Y. Ouyang - Officer	Tax withholding / forfeiture	Common Stock	66^{footnote F3}	$45.82	$3K
Footnote F1 (shares): 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 4,2025 Footnote F3 (shares): 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.
Jun 4, 2026	Michelle R. Mortensen - Officer	Tax withholding / forfeiture	Common Stock	74^{footnote F1}	$45.24	$3K
Jun 5, 2026	Michelle R. Mortensen - Officer	Tax withholding / forfeiture	Common Stock	73^{footnote F2}	$45.82	$3K
Footnote F1 (shares): 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 4,2025 Footnote F2 (shares): 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.
Jun 4, 2026	Greg A. Milleman - Officer	Tax withholding / forfeiture	Common Stock	67^{footnote F1}	$45.24	$3K
Jun 5, 2026	Greg A. Milleman - Officer	Tax withholding / forfeiture	Common Stock	66^{footnote F3}	$45.82	$3K
Footnote F1 (shares): 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 4,2025 Footnote F3 (shares): 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.
Jun 4, 2026	Michael S. Mares Jr. - Officer	Tax withholding / forfeiture	Common Stock	69^{footnote F1}	$45.24	$3K
Jun 5, 2026	Michael S. Mares Jr. - Officer	Tax withholding / forfeiture	Common Stock	68^{footnote F2}	$45.82	$3K
Footnote F1 (shares): 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 4,2025 Footnote F2 (shares): 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.
Jun 4, 2026	James Patrick Lynch - Officer	Tax withholding / forfeiture	Common Stock	49^{footnote F1}	$45.24	$2K
Jun 5, 2026	James Patrick Lynch - Officer	Tax withholding / forfeiture	Common Stock	49^{footnote F3}	$45.82	$2K
Footnote F1 (shares): 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 4,2025 Footnote F3 (shares): 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.
Jun 5, 2026	Michael B. Luu - Officer	Tax withholding / forfeiture	Common Stock	69^{footnote F3}	$45.82	$3K
Jun 4, 2026	Michael B. Luu - Officer	Tax withholding / forfeiture	Common Stock	70^{footnote F1}	$45.24	$3K
Footnote F1 (shares): 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 4,2025 Footnote F3 (shares): 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.
Jun 4, 2026	Martin A. Kropelnicki - Officer	Tax withholding / forfeiture	Common Stock	504^{footnote F1}	$45.24	$23K
Jun 5, 2026	Martin A. Kropelnicki - Officer	Tax withholding / forfeiture	Common Stock	493^{footnote F3}	$45.82	$23K
Footnote F1 (shares): 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 4,2025 Footnote F3 (shares): 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.
Jun 4, 2026	Kenneth G. Jenkins - Officer	Tax withholding / forfeiture	Common Stock	63^{footnote F1}	$45.24	$3K
Jun 5, 2026	Kenneth G. Jenkins - Officer	Tax withholding / forfeiture	Common Stock	38^{footnote F2}	$45.82	$2K
Footnote F1 (shares): 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 4,2025 Footnote F2 (shares): 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.
Jun 4, 2026	Sophie Marwieh James - Officer	Tax withholding / forfeiture	Common Stock	51^{footnote F1}	$45.24	$2K
Jun 5, 2026	Sophie Marwieh James - Officer	Tax withholding / forfeiture	Common Stock	50^{footnote F3}	$45.82	$2K
Footnote F1 (shares): 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 4,2025 Footnote F3 (shares): 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.
Jun 4, 2026	Kristan A. Hamner - Officer	Tax withholding / forfeiture	Common Stock	41^{footnote F1}	$45.24	$2K
Footnote F1 (shares): 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 4,2025
Jun 4, 2026	Shannon C. Dean - Officer	Tax withholding / forfeiture	Common Stock	74^{footnote F1}	$45.24	$3K
Jun 5, 2026	Shannon C. Dean - Officer	Tax withholding / forfeiture	Common Stock	73^{footnote F3}	$45.82	$3K
Footnote F1 (shares): 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 4,2025 Footnote F3 (shares): 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.
Jun 4, 2026	Shawn C. Bunting - Officer	Tax withholding / forfeiture	Common Stock	70^{footnote F1}	$45.24	$3K
Jun 5, 2026	Shawn C. Bunting - Officer	Tax withholding / forfeiture	Common Stock	69^{footnote F2}	$45.82	$3K
Footnote F1 (shares): 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 4,2025 Footnote F2 (shares): 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.

Recent CWT Form 8-K filings

Read CWT company news

Jul 30, 2026Item 2.02, 9.01

Read the filing on SEC EDGAR

Jul 29, 2026Item 8.01, 9.01

Read the filing on SEC EDGAR

May 21, 2026Item 5.07

Read the filing on SEC EDGAR

May 20, 2026Item 7.01, 9.01

Read the filing on SEC EDGAR

May 1, 2026Item 8.01, 9.01

Read the filing on SEC EDGAR

Recent CWT Form 144 notices of proposed sale

An insider files Form 144 before selling restricted or control stock. It announces a planned sale. If the sale goes ahead, it shows up later on a Form 4.

Filed	Filer	Relationship	Shares	Market value	Notice
Aug 13, 2026	Krummel Thomas M	Director	3,700	$185K	View on EDGAR
May 21, 2026	-	-	-	-	View on EDGAR

CWT insider trading FAQ

What is the latest insider trade for CWT?

CALIFORNIA WATER SERVICE GROUP (CWT) had 16 insider filings in the last 90 days, with the most recent on 2026-09-08. The full record for CWT runs to 129 Form 4 filings, the earliest from 2024-11-25. InsiderAlpha adds new Form 4, Form 144 and 8-K filings as they arrive from SEC EDGAR.

How many insiders are buying CWT stock?

No insider purchases of CWT were filed in the last 90 days.

How many insiders are selling CWT stock?

2 insider sales of CWT were filed in the last 90 days, totaling $211K.

Where can I see CWT SEC filings (Form 4, 10-K, 10-Q, 8-K)?

This page collects CWT Form 4 insider transactions, Form 144 sale notices and 8-K filings in one place. Annual 10-K and quarterly 10-Q reports live on the company's SEC EDGAR page.

More Utilities companies with insider activity

Recent insider filings

The EDGAR links open each original Form 4, so you can check any number on this page against the filing it came from.

Sep 8, 2026 - Thomas A. Scanlon view on EDGAR
Sep 8, 2026 - Todd Kenneth Peters view on EDGAR
Sep 8, 2026 - Elissa Y. Ouyang view on EDGAR
Sep 8, 2026 - Michelle R. Mortensen view on EDGAR
Sep 8, 2026 - Michael S. Mares Jr. view on EDGAR
Sep 8, 2026 - James Patrick Lynch view on EDGAR
Sep 8, 2026 - Michael B. Luu view on EDGAR
Sep 8, 2026 - Martin A. Kropelnicki view on EDGAR
Sep 8, 2026 - Kenneth G. Jenkins view on EDGAR
Sep 8, 2026 - Sophie Marwieh James view on EDGAR

Related companies with recent insider activity

Learn more

Insider selling: signal or noise?: Why most insider sales are routine, and the few patterns worth a second look.
Form 144 vs Form 4: A Form 144 announces a planned sale; the Form 4 reports it after it happens.
Insider activity in Utilities: Where CWT's peers are being bought and sold.
Every recent Form 4: The market-wide feed, updated as filings arrive from SEC EDGAR.

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Form 4 transaction type

Transactions

Total value

Open-market sale

4,200

$211K

Grant or award

446

Tax withholding / forfeiture

2,325

Date

Insider

Transaction

Security

Price

Value

Sep 4, 2026

Thomas A. Scanlon - Officer

Tax withholding / forfeiture

Common Stock

30^{footnote F1}

$50.03

$2K

Sep 5, 2026

Thomas A. Scanlon - Officer

Tax withholding / forfeiture

Common Stock

30^{footnote F3}

$50.03

$2K

Footnote F1 (shares): 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 4,2025
Footnote F3 (shares): 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.

Sep 4, 2026

Todd Kenneth Peters - Officer

Tax withholding / forfeiture

Common Stock

41^{footnote F1}

$50.03

$2K

Sep 5, 2026

Todd Kenneth Peters - Officer

Tax withholding / forfeiture

Common Stock

40^{footnote F2}

$50.03

$2K

Footnote F1 (shares): 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 4,2025
Footnote F2 (shares): 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.

Sep 4, 2026

Elissa Y. Ouyang - Officer

Tax withholding / forfeiture

Common Stock

68^{footnote F1}

$50.03

$3K

Sep 5, 2026

Elissa Y. Ouyang - Officer

Tax withholding / forfeiture

Common Stock

66^{footnote F2}

$50.03

$3K

Footnote F1 (shares): 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 4,2025
Footnote F2 (shares): 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.

Sep 4, 2026

Michelle R. Mortensen - Officer

Tax withholding / forfeiture

Common Stock

75^{footnote F1}

$50.03

$4K

Sep 5, 2026

Michelle R. Mortensen - Officer

Tax withholding / forfeiture

Common Stock

73^{footnote F2}

$50.03

$4K

Footnote F1 (shares): 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 4,2025
Footnote F2 (shares): 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.

Sep 4, 2026

Michael S. Mares Jr. - Officer

Tax withholding / forfeiture

Common Stock

69^{footnote F1}

$50.03

$3K

Sep 5, 2026

Michael S. Mares Jr. - Officer

Tax withholding / forfeiture

Common Stock

67^{footnote F2}

$50.03

$3K

Footnote F1 (shares): 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 4,2025
Footnote F2 (shares): 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.

Sep 4, 2026

James Patrick Lynch - Officer

Tax withholding / forfeiture

Common Stock

50^{footnote F1}

$50.03

$3K

Sep 5, 2026

James Patrick Lynch - Officer

Tax withholding / forfeiture

Common Stock

48^{footnote F2}

$50.03

$2K

Footnote F1 (shares): 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 4,2025
Footnote F2 (shares): 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.

Sep 4, 2026

Michael B. Luu - Officer

Tax withholding / forfeiture

Common Stock

70^{footnote F1}

$50.03

$4K

Sep 5, 2026

Michael B. Luu - Officer

Tax withholding / forfeiture

Common Stock

68^{footnote F3}

$50.03

$3K

Footnote F1 (shares): 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 4,2025
Footnote F3 (shares): 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.

Sep 4, 2026

Martin A. Kropelnicki - Officer

Tax withholding / forfeiture

Common Stock

505^{footnote F1}

$50.03

$25K

Sep 5, 2026

Martin A. Kropelnicki - Officer

Tax withholding / forfeiture

Common Stock

493^{footnote F2}

$50.03

$25K

Footnote F1 (shares): 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 4,2025
Footnote F2 (shares): 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.

Sep 5, 2026

Kenneth G. Jenkins - Officer

Tax withholding / forfeiture

Common Stock

38^{footnote F2}

$50.03

$2K

Sep 4, 2026

Kenneth G. Jenkins - Officer

Tax withholding / forfeiture

Common Stock

64^{footnote F1}

$50.03

$3K

Footnote F1 (shares): 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 4,2025
Footnote F2 (shares): 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.

Sep 4, 2026

Sophie Marwieh James - Officer

Tax withholding / forfeiture

Common Stock

51^{footnote F1}

$50.03

$3K

Sep 5, 2026

Sophie Marwieh James - Officer

Tax withholding / forfeiture

Common Stock

50^{footnote F3}

$50.03

$3K

Footnote F1 (shares): 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 4,2025
Footnote F3 (shares): 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.

Sep 4, 2026

Kristan A. Hamner - Officer

Tax withholding / forfeiture

Common Stock

42^{footnote F1}

$50.03

$2K

Footnote F1 (shares): 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 4,2025

Sep 4, 2026

Shannon C. Dean - Officer

Tax withholding / forfeiture

Common Stock

75^{footnote F1}

$50.03

$4K

Sep 5, 2026

Shannon C. Dean - Officer

Tax withholding / forfeiture

Common Stock

72^{footnote F3}

$50.03

$4K

Footnote F1 (shares): 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 4,2025
Footnote F3 (shares): 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.

Sep 4, 2026

Shawn C. Bunting - Officer

Tax withholding / forfeiture

Common Stock

71^{footnote F1}

$50.03

$4K

Sep 5, 2026

Shawn C. Bunting - Officer

Tax withholding / forfeiture

Common Stock

69^{footnote F2}

$50.03

$3K

Footnote F1 (shares): 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 4,2025
Footnote F2 (shares): 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.

Sep 1, 2026

Lester A. Snow - Director

Open-market sale

Common Stock

500

$50.21^{footnote F1}

$25K

Footnote F1 (price): This transaction was a single trade at a price of $50.21.

Aug 13, 2026

Thomas M. Krummel - Director

Open-market sale

Common Stock

3,700

$50.37

$186K

Aug 4, 2026

Gregory Dale Shimansky - Officer

Grant or award

Common Stock

446^{footnote F1}

$0.00

Footnote F1 (shares): Restricted stock granted on 8/4/2026 pursuant to the California Water Service Group equity incentive plan in a transaction exempt under Rule 16-b-3. RSA vests one-third on March 3, 2027 with the remaining 2/3 vesting quarterly over the succeeding 24 months.

Jun 4, 2026

Thomas A. Scanlon - Officer

Tax withholding / forfeiture

Common Stock

30^{footnote F1}

$45.24

$1K

Jun 5, 2026

Thomas A. Scanlon - Officer

Tax withholding / forfeiture

Common Stock

30^{footnote F2}

$45.82

$1K

Footnote F1 (shares): 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 4,2025
Footnote F2 (shares): 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.

Jun 4, 2026

Todd Kenneth Peters - Officer

Tax withholding / forfeiture

Common Stock

40^{footnote F1}

$45.24

$2K

Jun 5, 2026

Todd Kenneth Peters - Officer

Tax withholding / forfeiture

Common Stock

40^{footnote F2}

$45.82

$2K

Footnote F1 (shares): 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 4,2025
Footnote F2 (shares): 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.

Jun 4, 2026

Elissa Y. Ouyang - Officer

Tax withholding / forfeiture

Common Stock

67^{footnote F1}

$45.24

$3K

Jun 5, 2026

Elissa Y. Ouyang - Officer

Tax withholding / forfeiture

Common Stock

66^{footnote F3}

$45.82

$3K

Footnote F1 (shares): 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 4,2025
Footnote F3 (shares): 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.

Jun 4, 2026

Michelle R. Mortensen - Officer

Tax withholding / forfeiture

Common Stock

74^{footnote F1}

$45.24

$3K

Jun 5, 2026

Michelle R. Mortensen - Officer

Tax withholding / forfeiture

Common Stock

73^{footnote F2}

$45.82

$3K

Footnote F1 (shares): 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 4,2025
Footnote F2 (shares): 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.

Jun 4, 2026

Greg A. Milleman - Officer

Tax withholding / forfeiture

Common Stock

67^{footnote F1}

$45.24

$3K

Jun 5, 2026

Greg A. Milleman - Officer

Tax withholding / forfeiture

Common Stock

66^{footnote F3}

$45.82

$3K

Footnote F1 (shares): 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 4,2025
Footnote F3 (shares): 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.

Jun 4, 2026

Michael S. Mares Jr. - Officer

Tax withholding / forfeiture

Common Stock

69^{footnote F1}

$45.24

$3K

Jun 5, 2026

Michael S. Mares Jr. - Officer

Tax withholding / forfeiture

Common Stock

68^{footnote F2}

$45.82

$3K

Footnote F1 (shares): 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 4,2025
Footnote F2 (shares): 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.

Jun 4, 2026

James Patrick Lynch - Officer

Tax withholding / forfeiture

Common Stock

49^{footnote F1}

$45.24

$2K

Jun 5, 2026

James Patrick Lynch - Officer

Tax withholding / forfeiture

Common Stock

49^{footnote F3}

$45.82

$2K

Footnote F1 (shares): 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 4,2025
Footnote F3 (shares): 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.

Jun 5, 2026

Michael B. Luu - Officer

Tax withholding / forfeiture

Common Stock

69^{footnote F3}

$45.82

$3K

Jun 4, 2026

Michael B. Luu - Officer

Tax withholding / forfeiture

Common Stock

70^{footnote F1}

$45.24

$3K

Footnote F1 (shares): 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 4,2025
Footnote F3 (shares): 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.

Jun 4, 2026

Martin A. Kropelnicki - Officer

Tax withholding / forfeiture

Common Stock

504^{footnote F1}

$45.24

$23K

Jun 5, 2026

Martin A. Kropelnicki - Officer

Tax withholding / forfeiture

Common Stock

493^{footnote F3}

$45.82

$23K

Footnote F1 (shares): 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 4,2025
Footnote F3 (shares): 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.

Jun 4, 2026

Kenneth G. Jenkins - Officer

Tax withholding / forfeiture

Common Stock

63^{footnote F1}

$45.24

$3K

Jun 5, 2026

Kenneth G. Jenkins - Officer

Tax withholding / forfeiture

Common Stock

38^{footnote F2}

$45.82

$2K

Footnote F1 (shares): 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 4,2025
Footnote F2 (shares): 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.

Jun 4, 2026

Sophie Marwieh James - Officer

Tax withholding / forfeiture

Common Stock

51^{footnote F1}

$45.24

$2K

Jun 5, 2026

Sophie Marwieh James - Officer

Tax withholding / forfeiture

Common Stock

50^{footnote F3}

$45.82

$2K

Footnote F1 (shares): 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 4,2025
Footnote F3 (shares): 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.

Jun 4, 2026

Kristan A. Hamner - Officer

Tax withholding / forfeiture

Common Stock

41^{footnote F1}

$45.24

$2K

Footnote F1 (shares): 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 4,2025

Jun 4, 2026

Shannon C. Dean - Officer

Tax withholding / forfeiture

Common Stock

74^{footnote F1}

$45.24

$3K

Jun 5, 2026

Shannon C. Dean - Officer

Tax withholding / forfeiture

Common Stock

73^{footnote F3}

$45.82

$3K

Footnote F1 (shares): 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 4,2025
Footnote F3 (shares): 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.

Jun 4, 2026

Shawn C. Bunting - Officer

Tax withholding / forfeiture

Common Stock

70^{footnote F1}

$45.24

$3K

Jun 5, 2026

Shawn C. Bunting - Officer

Tax withholding / forfeiture

Common Stock

69^{footnote F2}

$45.82

$3K

Footnote F1 (shares): 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 4,2025
Footnote F2 (shares): 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.

Filed

Filer

Relationship

Market value

Notice

Aug 13, 2026

Krummel Thomas M

Director

3,700

$185K

View on EDGAR

May 21, 2026

View on EDGAR