California Water Service Group
Ownership
Ownership Structure
Who owns California Water Service Group (CWT)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 99.2% of the shares are freely tradable; institutional investors hold 94.7%.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| BlackRock Inc | 16.67 | 10,308,555 | -3.5 | 03/31/2026 |
| Vanguard Portfolio Management, LLC | 6.94 | 4,289,673 | +0.0 | 03/31/2026 |
| Amundi | 5.61 | 3,470,997 | +26.7 | 03/31/2026 |
| T. Rowe Price Investment Management,Inc. | 5.53 | 3,418,294 | -15.8 | 03/31/2026 |
| State Street Corp | 5.02 | 3,102,659 | +2.4 | 03/31/2026 |
| Vanguard Capital Management, LLC | 4.31 | 2,665,225 | +0.0 | 03/31/2026 |
| ATLAS Infrastructure Partners (UK) Ltd | 3.21 | 1,984,605 | +0.0 | 06/30/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| iShares Core S&P Small-Cap ETF | 5.90 | 3,649,537 | +0.0 | 08/31/2026 |
| Vanguard MStar Total Stk Mkt Idx Invest | 3.09 | 1,910,144 | +0.5 | 07/31/2026 |
| iShares Russell 2000 ETF | 2.51 | 1,552,270 | -0.6 | 08/31/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Insider holdings
| Person | Role | Shares | Value | As of | Type |
|---|---|---|---|---|---|
| Kropelnicki Martin A | Chairman President & CEO | 147,287 | 7,055,026 $ | Sep 5, 2026 | direct |
| Luu Michael B | SVP Corp Svce & Chief Risk Of | 23,744 | 1,137,316 $ | Sep 5, 2026 | direct |
| Dean Shannon C | SVP, Cust Svc & Chief Sust Of | 23,613 | 1,131,047 $ | Sep 5, 2026 | direct |
| Krummel Thomas M | Director | 20,104 | 962,978 $ | Aug 13, 2026 | direct |
| Snow Lester A | Director | 17,817 | 853,431 $ | Sep 1, 2026 | direct |
| Ouyang Elissa Y | VP Facilities Fleet Procure IT | 14,805 | 709,181 $ | Sep 5, 2026 | direct |
| Mortensen Michelle R | VP Corp Sect, Gov & Assurance | 12,807 | 613,434 $ | Sep 5, 2026 | direct |
| James Sophie Marwieh | VP Water Qual | 8,287 | 396,967 $ | Sep 5, 2026 | direct |
| Peters Todd Kenneth | Vice President, Engineering | 8,259 | 395,603 $ | Sep 5, 2026 | direct |
| Mares Michael S JR | SVP Operations | 8,252 | 395,267 $ | Sep 5, 2026 | direct |
| Lynch James Patrick | SVP CFO and Treasurer | 6,486 | 310,657 $ | Sep 5, 2026 | direct |
| Scanlon Thomas A | VP, Corporate Controller & PAO | 5,690 | 272,564 $ | Sep 5, 2026 | direct |
| Jenkins Kenneth G | VP Water Res Plan & Sustain | 5,126 | 245,528 $ | Sep 5, 2026 | direct |
| Bunting Shawn C | SVP, Chief Legal Officer & BD | 4,574 | 219,082 $ | Sep 5, 2026 | direct |
| Hamner Kristan A | VP, Chief Human Resource Offcr | 2,979 | 142,705 $ | Sep 4, 2026 | direct |
Holdings as of each person's most recent SEC Form 4 filing — excluding options and RSUs, which are not shares yet. Holdings may have changed between two filings.
Insiders
Insider Transactions
| Date | Person | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Sep 5, 2026 | James Sophie Marwieh | VP Water Qual | Other | 50 | 50.03 | 2,502 |
| Sep 5, 2026 | Jenkins Kenneth G | VP Water Res Plan & Sustain | Other | 38 | 50.03 | 1,901 |
| Sep 5, 2026 | Bunting Shawn C | SVP, Chief Legal Officer & BD | Other | 69 | 50.03 | 3,452 |
| Sep 5, 2026 | Peters Todd Kenneth | Vice President, Engineering | Other | 40 | 50.03 | 2,001 |
| Sep 5, 2026 | Scanlon Thomas A | VP, Corporate Controller & PAO | Other | 30 | 50.03 | 1,501 |
| Sep 5, 2026 | Mares Michael S JR | SVP Operations | Other | 67 | 50.03 | 3,352 |
| Sep 5, 2026 | Ouyang Elissa Y | VP Facilities Fleet Procure IT | Other | 66 | 50.03 | 3,302 |
| Sep 5, 2026 | Dean Shannon C | SVP, Cust Svc & Chief Sust Of | Other | 72 | 50.03 | 3,602 |
| Sep 5, 2026 | Mortensen Michelle R | VP Corp Sect, Gov & Assurance | Other | 73 | 50.03 | 3,652 |
| Sep 5, 2026 | Luu Michael B | SVP Corp Svce & Chief Risk Of | Other | 68 | 50.03 | 3,402 |
| Sep 5, 2026 | Lynch James Patrick | SVP CFO and Treasurer | Other | 48 | 50.03 | 2,401 |
| Sep 5, 2026 | Kropelnicki Martin A | Chairman President & CEO | Other | 493 | 50.03 | 24,665 |
| Sep 4, 2026 | Hamner Kristan A | VP, Chief Human Resource Offcr | Other | 42 | 50.03 | 2,101 |
| Sep 4, 2026 | James Sophie Marwieh | VP Water Qual | Other | 51 | 50.03 | 2,552 |
| Sep 4, 2026 | Jenkins Kenneth G | VP Water Res Plan & Sustain | Other | 64 | 50.03 | 3,202 |
| Sep 4, 2026 | Bunting Shawn C | SVP, Chief Legal Officer & BD | Other | 71 | 50.03 | 3,552 |
| Sep 4, 2026 | Peters Todd Kenneth | Vice President, Engineering | Other | 41 | 50.03 | 2,051 |
| Sep 4, 2026 | Scanlon Thomas A | VP, Corporate Controller & PAO | Other | 30 | 50.03 | 1,501 |
| Sep 4, 2026 | Mares Michael S JR | SVP Operations | Other | 69 | 50.03 | 3,452 |
| Sep 4, 2026 | Ouyang Elissa Y | VP Facilities Fleet Procure IT | Other | 68 | 50.03 | 3,402 |
| Sep 4, 2026 | Dean Shannon C | SVP, Cust Svc & Chief Sust Of | Other | 75 | 50.03 | 3,752 |
| Sep 4, 2026 | Mortensen Michelle R | VP Corp Sect, Gov & Assurance | Other | 75 | 50.03 | 3,752 |
| Sep 4, 2026 | Luu Michael B | SVP Corp Svce & Chief Risk Of | Other | 70 | 50.03 | 3,502 |
| Sep 4, 2026 | Lynch James Patrick | SVP CFO and Treasurer | Other | 50 | 50.03 | 2,502 |
| Sep 4, 2026 | Kropelnicki Martin A | Chairman President & CEO | Other | 505 | 50.03 | 25,265 |
| Sep 1, 2026 | Snow Lester A | Director | Sell | 500 | 50.21 | 25,105 |
| Aug 13, 2026 | Krummel Thomas M | Director | Sell | 3,700 | 50.37 | 186,351 |
| Aug 4, 2026 | Shimansky Gregory Dale | VP, Rates & Reg Affairs | Other | 446 | 0.00 | – |
Reportable transactions by officers and major shareholders from SEC Form 4 filings. "Other" includes things like stock grants and option exercises without a buy/sell character. View all insider transactions →
Data as of: September 17, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.