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 |
|---|---|---|---|---|---|
| BlackRock, Inc. | 10,308,555 | $467.4M | 0.01% | −372,796−3.5% | Reduced |
| Vanguard Portfolio Management LLC | 4,289,673 | $194.5M | 0.01% | +4,289,673 | New |
| Amundi | 3,470,997 | $157.4M | 0.04% | +732,004+26.7% | Added |
| T. Rowe Price Investment Management, Inc. | 3,418,294 | $155.0M | 0.11% | +81,089+2.4% | Added |
| State Street Corp | 3,102,659 | $140.7M | 0.00% | +72,709+2.4% | Added |
| Vanguard Capital Management LLC | 2,665,225 | $120.8M | 0.00% | +2,665,225 | New |
| Nuance Investments, LLC | 1,603,748 | $72.7M | 10.14% | −221,642−12.1% | Reduced |
| Geode Capital Management, LLC | 1,475,405 | $66.9M | 0.00% | +54,455+3.8% | Added |
| FMR LLC | 1,390,014 | $63.0M | 0.00% | −406,134−22.6% | Reduced |
| First Trust Advisors LP | 1,354,165 | $61.4M | 0.04% | −13,813−1.0% | Reduced |
| Dimensional Fund Advisors LP | 1,158,359 | $52.5M | 0.01% | +4,428+0.4% | Added |
| Morgan Stanley | 1,118,705 | $50.7M | 0.00% | +351,671+45.8% | Added |
| Invesco Ltd. | 1,002,232 | $45.4M | 0.00% | +47,998+5.0% | Added |
| Legal & General Group Plc | 777,542 | $35.3M | 0.01% | +13,695+1.8% | Added |
| Charles Schwab Investment Management Inc | 728,456 | $33.0M | 0.01% | +17,788+2.5% | Added |
| Cbre Clarion Securities LLC | 647,515 | $29.4M | 0.44% | −74,830−10.4% | Reduced |
| Northern Trust Corp | 637,303 | $28.9M | 0.00% | +25,751+4.2% | Added |
| KBC Group NV | 577,247 | $26.2M | 0.07% | +130,620+29.2% | Added |
| Bank of New York Mellon Corp | 506,702 | $23.0M | 0.00% | +1,866+0.4% | Added |
| Nuveen, LLC | 425,114 | $19.3M | 0.01% | −14,960−3.4% | Reduced |
| Triodos Investment Management BV | 414,000 | $18.8M | 1.42% | 00.0% | Unchanged |
| Beck Bode, LLC | 411,714 | $18.7M | 3.16% | +23,296+6.0% | Added |
| Vanguard Fiduciary Trust Co | 386,412 | $17.5M | 0.00% | +386,412 | New |
| Victory Capital Management Inc | 321,315 | $14.6M | 0.01% | +5,850+1.9% | Added |
| Raymond James Financial Inc | 294,518 | $13.4M | 0.00% | +12,630+4.5% | Added |
| Principal Financial Group Inc | 289,623 | $13.1M | 0.01% | +5,600+2.0% | Added |
| Goldman Sachs Group Inc | 283,976 | $12.9M | 0.00% | +57,686+25.5% | Added |
| American Century Companies Inc | 261,258 | $11.8M | 0.01% | +133,242+104.1% | Added |
| Arrowstreet Capital, Limited Partnership | 257,970 | $11.7M | 0.01% | +208,061+416.9% | Added |
| Marshall Wace, LLP | 256,767 | $11.6M | 0.01% | +256,767 | New |
| UBS Asset Management Americas Inc | 234,733 | $10.6M | 0.00% | +900.0% | Added |
| Public Sector Pension Investment Board | 213,166 | $9.66M | 0.03% | +6,969+3.4% | Added |
| Qube Research & Technologies Ltd | 186,926 | $8.48M | 0.01% | +176,835+1,752.4% | Added |
| UBS Group AG | 185,826 | $8.43M | 0.00% | −28,453−13.3% | Reduced |
| Rhumbline Advisers | 174,397 | $7.91M | 0.01% | +732+0.4% | Added |
| AQR Capital Management LLC | 169,731 | $7.70M | 0.00% | +108,592+177.6% | Added |
| JPMorgan Chase & Co | 151,087 | $6.96M | 0.00% | −74,799−33.1% | Reduced |
| ProShare Advisors LLC | 152,050 | $6.89M | 0.01% | +1,423+0.9% | Added |
| Mariner, LLC | 138,231 | $6.27M | 0.01% | +51,134+58.7% | Added |
| Ameriprise Financial Inc | 136,151 | $6.17M | 0.00% | −10,959−7.4% | Reduced |
| Meiji Yasuda Asset Management Co Ltd. | 134,116 | $6.08M | 0.30% | +49,317+58.2% | Added |
| Federated Hermes, Inc. | 129,191 | $5.86M | 0.01% | +7,171+5.9% | Added |
| Jane Street Group, LLC | 123,278 | $5.59M | 0.01% | +79,894+184.2% | Added |
| Bank of America Corp | 121,899 | $5.53M | 0.00% | +22,825+23.0% | Added |
| Swiss National Bank | 117,500 | $5.33M | 0.00% | 00.0% | Unchanged |
| Commonwealth of Pennsylvania Public School Empls Retrmt Sys | 105,960 | $4.80M | 0.02% | −6,192−5.5% | Reduced |
| Martingale Asset Management L P | 103,980 | $4.71M | 0.12% | +22,533+27.7% | Added |
| Crawford Investment Counsel Inc | 102,989 | $4.67M | 0.08% | +11,000+12.0% | Added |
| Renaissance Technologies LLC | 100,400 | $4.55M | 0.01% | −11,500−10.3% | Reduced |
| Deutsche Bank AG | 95,417 | $4.33M | 0.00% | +8,427+9.7% | Added |
| Great West Life Assurance Co | 94,557 | $4.30M | 0.01% | −2,624−2.7% | Reduced |
| Trexquant Investment LP | 86,599 | $3.93M | 0.03% | −48,993−36.1% | Reduced |
| Duff & Phelps Investment Management Co | 85,115 | $3.86M | 0.04% | +85,115 | New |
| Price T Rowe Associates Inc | 83,413 | $3.78M | 0.00% | +9,033+12.1% | Added |
| D. E. Shaw & Co., Inc. | 82,792 | $3.75M | 0.00% | +16,601+25.1% | Added |
| Two Sigma Investments, LP | 76,976 | $3.49M | 0.00% | +53,900+233.6% | Added |
| Franklin Resources Inc | 67,573 | $3.06M | 0.00% | +17,180+34.1% | Added |
| Jacobs Levy Equity Management, Inc | 66,489 | $3.01M | 0.01% | −14,430−17.8% | Reduced |
| New York State Teachers Retirement System | 63,026 | $2.86M | 0.01% | +240.0% | Added |
| Alliancebernstein L.P. | 65,816 | $2.85M | 0.00% | −17,438−20.9% | Reduced |
| Maryland State Retirement & Pension System | 61,780 | $2.80M | 0.06% | −2,717−4.2% | Reduced |
| Prudential Financial Inc | 61,553 | $2.79M | 0.00% | −8,280−11.9% | Reduced |
| Magellan Asset Management Ltd | 61,416 | $2.78M | 0.04% | +12,682+26.0% | Added |
| Millennium Management LLC | 61,281 | $2.78M | 0.00% | −28,876−32.0% | Reduced |
| Thrivent Financial for Lutherans | 60,360 | $2.74M | 0.01% | +17,753+41.7% | Added |
| Universal- Beteiligungs- und Servicegesellschaft mbH | 60,272 | $2.73M | 0.00% | +24,641+69.2% | Added |
| Northstar Asset Management Inc | 59,981 | $2.72M | 0.83% | −22,880−27.6% | Reduced |
| Allianz Asset Management GmbH | 58,862 | $2.67M | 0.00% | +5,318+9.9% | Added |
| TD Asset Management Inc | 58,038 | $2.63M | 0.00% | 00.0% | Unchanged |
| California State Teachers Retirement System | 56,273 | $2.55M | 0.00% | −445−0.8% | Reduced |
| Vanguard Asset Management, Ltd | 55,723 | $2.53M | 0.00% | +55,723 | New |
| Macquarie Group Ltd | 53,445 | $2.42M | 0.01% | +19,813+58.9% | Added |
| SEI Investments Co | 52,883 | $2.40M | 0.00% | +29,797+129.1% | Added |
| Midwest Trust Co | 52,833 | $2.40M | 0.03% | −1,595−2.9% | Reduced |
| Exchange Traded Concepts, LLC | 52,812 | $2.39M | 0.02% | +1,437+2.8% | Added |
| Wells Fargo & Company | 52,807 | $2.39M | 0.00% | −45,795−46.4% | Reduced |
| Fideuram - Intesa Sanpaolo Private Banking S.P.A. | 51,806 | $2.35M | 0.08% | −2,601−4.8% | Reduced |
| Rodgers Brothers Inc. | 50,025 | $2.27M | 0.26% | −2,150−4.1% | Reduced |
| Barclays PLC | 49,573 | $2.25M | 0.00% | −72,948−59.5% | Reduced |
| Clear Harbor Asset Management, LLC | 49,311 | $2.24M | 0.15% | −349−0.7% | Reduced |
| Storebrand Asset Management AS | 49,165 | $2.23M | 0.01% | −8,384−14.6% | Reduced |
| Squarepoint Ops LLC | 49,016 | $2.22M | 0.00% | +49,016 | New |
| State of New Jersey Common Pension Fund D | 48,678 | $2.21M | 0.01% | +748+1.6% | Added |
| Mirae Asset Global ETFs Holdings Ltd. | 47,167 | $2.14M | 0.00% | +4,037+9.4% | Added |
| Zurcher Kantonalbank (Zurich Cantonalbank) | 46,984 | $2.13M | 0.00% | +9,660+25.9% | Added |
| Wedge Capital Management L L P | 44,565 | $2.02M | 0.04% | +44,565 | New |
| Vanguard Investments Australia, Ltd. | 44,533 | $2.02M | 0.01% | +44,533 | New |
| SG Americas Securities, LLC | 44,335 | $2.01M | 0.00% | +4,515+11.3% | Added |
| HRT Financial LP | 43,235 | $1.96M | 0.00% | +9,034+26.4% | Added |
| Gabelli Funds LLC | 43,200 | $1.96M | 0.01% | 00.0% | Unchanged |
| Kornitzer Capital Management Inc | 42,500 | $1.93M | 0.04% | +42,500 | New |
| Mackenzie Financial Corp | 41,040 | $1.86M | 0.00% | +25,406+162.5% | Added |
| Vontobel Holding Ltd. | 40,145 | $1.82M | 0.01% | +6,529+19.4% | Added |
| Bridge City Capital, LLC | 38,292 | $1.74M | 0.48% | −284−0.7% | Reduced |
| Capital Fund Management S.A. | 37,327 | $1.69M | 0.02% | +13,050+53.8% | Added |
| Nia Impact Advisors, LLC | 35,916 | $1.63M | 0.72% | −1,300−3.5% | Reduced |
| South Dakota Investment Council | 34,715 | $1.57M | 0.03% | +4,800+16.0% | Added |
| Citadel Advisors LLC | 34,698 | $1.57M | 0.00% | −138,032−79.9% | Reduced |
| Voya Investment Management LLC | 33,422 | $1.52M | 0.00% | +9,718+41.0% | Added |
| MetLife Investment Management | 33,075 | $1.50M | 0.01% | −262−0.8% | Reduced |