California Water Service Group
CWT- Exchange
- NYSE
- Industry
- Water Supply
- SEC CIK
- 0001035201
In the last 90 days, California Water Service Group insiders filed 0 open-market purchases and 2 sales; 346 institutions reported holding it in 13F filings for Q2 2026, worth $2.69B in total; no superinvestor holds it.
13F holders, Q1 2026
Institutional positions in California Water Service Group as of Mar 31, 2026. Investment managers with $100 million or more in US stocks report their long positions on Form 13F within 45 days after each quarter ends. How 13F works
- Institutional holders
- 339
- +15 vs. Q4 2025
- Shares held
- 51.3M
- +8.55M (+20.0%) vs. Q4 2025
- Total value
- $2.32B
- +$473.4M (+25.6%) vs. Q4 2025
- New holders
- 46
- 140 more added
- Sold out
- 31
- 88 more reduced
5 institutions that held it in Q4 2025 haven't filed for Q1 2026 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q4 2025: new holders, sold out and not filed yet
Holders and value by quarter
Institutions reporting CWT on Form 13F each quarter since Q1 2021, and the total value they reported. Values are as of each quarter end, so they also move with the share price.
| Quarter | Holders | Value |
|---|---|---|
| Q2 2026 | 346 | $2.69B |
| Q1 2026 | 339 | $2.32B |
| Q4 2025 | 329 | $2.17B |
| Q3 2025 | 337 | $2.30B |
| Q2 2025 | 338 | $2.29B |
| Q1 2025 | 330 | $2.45B |
| Q4 2024 | 323 | $2.23B |
| Q3 2024 | 324 | $2.63B |
| Q2 2024 | 299 | $2.34B |
| Q1 2024 | 275 | $2.27B |
| Q4 2023 | 285 | $2.47B |
| Q3 2023 | 273 | $2.26B |
| Q2 2023 | 286 | $2.44B |
| Q1 2023 | 299 | $2.61B |
| Q4 2022 | 295 | $2.73B |
| Q3 2022 | 281 | $2.31B |
| Q2 2022 | 281 | $2.44B |
| Q1 2022 | 312 | $2.51B |
| Q4 2021 | 307 | $2.96B |
| Q3 2021 | 268 | $2.40B |
| Q2 2021 | 251 | $2.20B |
| Q1 2021 | 259 | $2.18B |
Institutions, Q1 2026
Shares, value and share of portfolio for each institution holding California Water Service Group; share changes are against Q4 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Mariner, LLC | 138,231 | $6.27M | 0.01% | +51,134+58.7% | Added |
| ProShare Advisors LLC | 152,050 | $6.89M | 0.01% | +1,423+0.9% | Added |
| JPMorgan Chase & Co | 151,087 | $6.96M | 0.00% | −74,799−33.1% | Reduced |
| AQR Capital Management LLC | 169,731 | $7.70M | 0.00% | +108,592+177.6% | Added |
| Rhumbline Advisers | 174,397 | $7.91M | 0.01% | +732+0.4% | Added |
| UBS Group AG | 185,826 | $8.43M | 0.00% | −28,453−13.3% | Reduced |
| Qube Research & Technologies Ltd | 186,926 | $8.48M | 0.01% | +176,835+1,752.4% | Added |
| Public Sector Pension Investment Board | 213,166 | $9.66M | 0.03% | +6,969+3.4% | Added |
| UBS Asset Management Americas Inc | 234,733 | $10.6M | 0.00% | +900.0% | Added |
| Marshall Wace, LLP | 256,767 | $11.6M | 0.01% | +256,767 | New |
| Arrowstreet Capital, Limited Partnership | 257,970 | $11.7M | 0.01% | +208,061+416.9% | Added |
| American Century Companies Inc | 261,258 | $11.8M | 0.01% | +133,242+104.1% | Added |
| Goldman Sachs Group Inc | 283,976 | $12.9M | 0.00% | +57,686+25.5% | Added |
| Principal Financial Group Inc | 289,623 | $13.1M | 0.01% | +5,600+2.0% | Added |
| Raymond James Financial Inc | 294,518 | $13.4M | 0.00% | +12,630+4.5% | Added |
| Victory Capital Management Inc | 321,315 | $14.6M | 0.01% | +5,850+1.9% | Added |
| Vanguard Fiduciary Trust Co | 386,412 | $17.5M | 0.00% | +386,412 | New |
| Beck Bode, LLC | 411,714 | $18.7M | 3.16% | +23,296+6.0% | Added |
| Triodos Investment Management BV | 414,000 | $18.8M | 1.42% | 00.0% | Unchanged |
| Nuveen, LLC | 425,114 | $19.3M | 0.01% | −14,960−3.4% | Reduced |
| Bank of New York Mellon Corp | 506,702 | $23.0M | 0.00% | +1,866+0.4% | Added |
| KBC Group NV | 577,247 | $26.2M | 0.07% | +130,620+29.2% | Added |
| Northern Trust Corp | 637,303 | $28.9M | 0.00% | +25,751+4.2% | Added |
| Cbre Clarion Securities LLC | 647,515 | $29.4M | 0.44% | −74,830−10.4% | Reduced |
| Charles Schwab Investment Management Inc | 728,456 | $33.0M | 0.01% | +17,788+2.5% | Added |
| Legal & General Group Plc | 777,542 | $35.3M | 0.01% | +13,695+1.8% | Added |
| Invesco Ltd. | 1,002,232 | $45.4M | 0.00% | +47,998+5.0% | Added |
| Morgan Stanley | 1,118,705 | $50.7M | 0.00% | +351,671+45.8% | Added |
| Dimensional Fund Advisors LP | 1,158,359 | $52.5M | 0.01% | +4,428+0.4% | Added |
| First Trust Advisors LP | 1,354,165 | $61.4M | 0.04% | −13,813−1.0% | Reduced |
| FMR LLC | 1,390,014 | $63.0M | 0.00% | −406,134−22.6% | Reduced |
| Geode Capital Management, LLC | 1,475,405 | $66.9M | 0.00% | +54,455+3.8% | Added |
| Nuance Investments, LLC | 1,603,748 | $72.7M | 10.14% | −221,642−12.1% | Reduced |
| Vanguard Capital Management LLC | 2,665,225 | $120.8M | 0.00% | +2,665,225 | New |
| State Street Corp | 3,102,659 | $140.7M | 0.00% | +72,709+2.4% | Added |
| T. Rowe Price Investment Management, Inc. | 3,418,294 | $155.0M | 0.11% | +81,089+2.4% | Added |
| Amundi | 3,470,997 | $157.4M | 0.04% | +732,004+26.7% | Added |
| Vanguard Portfolio Management LLC | 4,289,673 | $194.5M | 0.01% | +4,289,673 | New |
| BlackRock, Inc. | 10,308,555 | $467.4M | 0.01% | −372,796−3.5% | Reduced |
| ExodusPoint Capital Management, LP | 0 | $0 | 0.00% | −238,840−100.0% | Sold out |
| Aptus Capital Advisors, LLC | 0 | $0 | 0.00% | −179,202−100.0% | Sold out |
| Quest Partners LLC | 0 | $0 | 0.00% | −43,190−100.0% | Sold out |
| Point72 Asset Management, L.P. | 0 | $0 | 0.00% | −40,192−100.0% | Sold out |
| Zimmer Partners, LP | 0 | $0 | 0.00% | −38,500−100.0% | Sold out |
| Maven Securities LTD | 0 | $0 | 0.00% | −27,611−100.0% | Sold out |
| Dark Forest Capital Management LP | 0 | $0 | 0.00% | −27,119−100.0% | Sold out |
| Balyasny Asset Management LLC | 0 | $0 | 0.00% | −26,758−100.0% | Sold out |
| Engineers Gate Manager LP | 0 | $0 | 0.00% | −20,821−100.0% | Sold out |
| HSBC Holdings PLC | 0 | $0 | 0.00% | −13,298−100.0% | Sold out |
| Versor Investments LP | 0 | $0 | 0.00% | −12,606−100.0% | Sold out |
| Banque Pictet & Cie SA | 0 | $0 | 0.00% | −9,152−100.0% | Sold out |
| Private Advisor Group, LLC | 0 | $0 | 0.00% | −9,011−100.0% | Sold out |
| Sciencast Management LP | 0 | $0 | 0.00% | −8,815−100.0% | Sold out |
| MQS Management LLC | 0 | $0 | 0.00% | −7,764−100.0% | Sold out |
| STRS Ohio | 0 | $0 | 0.00% | −6,900−100.0% | Sold out |
| PharVision Advisers, LLC | 0 | $0 | 0.00% | −6,756−100.0% | Sold out |
| Algert Global LLC | 0 | $0 | 0.00% | −6,257−100.0% | Sold out |
| Meeder Advisory Services, Inc. | 0 | $0 | 0.00% | −5,261−100.0% | Sold out |
| Profund Advisors LLC | 0 | $0 | 0.00% | −5,077−100.0% | Sold out |
| Aster Capital Management (DIFC) Ltd | 0 | $0 | 0.00% | −929−100.0% | Sold out |
| Danske Bank A/S | 0 | $0 | 0.00% | −600−100.0% | Sold out |
| MCF Advisors LLC | 0 | $0 | 0.00% | −100−100.0% | Sold out |
| Garton & Associates Financial Advisors LLC | 0 | $0 | 0.00% | −73−100.0% | Sold out |
| SageView Advisory Group, LLC | 0 | $0 | 0.00% | −59−100.0% | Sold out |
| Assetmark, Inc | 0 | $0 | 0.00% | −23−100.0% | Sold out |
| Torren Management, LLC | 0 | $0 | 0.00% | −21−100.0% | Sold out |
| Signature Equity Partners, LLC | 0 | $0 | 0.00% | −20−100.0% | Sold out |
| Flagship Harbor Advisors, LLC | 0 | $0 | 0.00% | −7−100.0% | Sold out |
| Abound Wealth Management | 0 | $0 | 0.00% | −4−100.0% | Sold out |
| Private Wealth Asset Management, LLC | 0 | $0 | 0.00% | −3−100.0% | Sold out |
| Vanguard Group Inc | – | – | – | – | Not filed |
| Norges Bank | – | – | – | – | Not filed |
| Comerica Bank | – | – | – | – | Not filed |
| Global Retirement Partners, LLC | – | – | – | – | Not filed |
| CIBC Private Wealth Group, LLC | – | – | – | – | Not filed |