CALIFORNIA WATER SERVICE GRP (CWT) Top Institutional Shareholders
CALIFORNIA WATER SERVICE GRP (CWT) is currently reported in institutional portfolios tracked by InsiderSet based on the latest available SEC Form 13F filings for the quarter ended March 31, 2026. The institutional investors covered on this page collectively reported approximately $2.18B in CWT holdings during the latest filing period.
Blackrock, Inc. is currently the largest disclosed institutional shareholder of CWT tracked by InsiderSet, reporting ownership valued at approximately $467.39M in its March 31, 2026 SEC Form 13F filing. Based on current market prices and the latest disclosed share count, the position is now estimated to be worth approximately $463.88M, representing an estimated loss of -0.75% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 65% of the total disclosed CWT value among the investors covered in this analysis. Major shareholders include Blackrock, Inc., Vanguard Portfolio Management Llc, Amundi, and several other long-term asset managers with concentrated positions in CALIFORNIA WATER SERVICE GRP (CWT).
This page ranks the largest institutional CWT shareholders using publicly disclosed SEC Form 13F data, including reported values, estimated current holding values, portfolio allocation percentages, ownership concentration metrics, and historical holding changes across major hedge funds and investment firms.
Institutional Holders
331
Total Reported Value
$2.18B
Largest Holder
Blackrock, Inc.
Largest Position
$467.39M
Insider Transactions (90d)
0
Latest Filing Quarter
Q1 2026
New Institutional Positions
75
Funds Exiting Positions
0
| Name | Investor/Manager | Portfolio % | Quantity | Reported Balance | Current Estimated Value | Gain/loss Since Filing | Estimated Portfolio Performance |
|---|---|---|---|---|---|---|---|
| Blackrock, Inc. | 0.01% | 10,308,555 | $467,389,882 | $463,884,975 | -$3,504,907 | -0.75% | |
| Vanguard Portfolio Management Llc | 0.01% | 4,289,673 | $194,493,774 | $193,035,285 | -$1,458,489 | -0.75% | |
| Amundi | 0.04% | 3,470,997 | $157,420,813 | $156,194,865 | -$1,225,948 | -0.78% | |
| State Street Corp | 0.00% | 3,102,659 | $140,674,559 | $139,619,655 | -$1,054,904 | -0.75% | |
| Vanguard Capital Management Llc | 0.00% | 2,665,225 | $120,841,302 | $119,935,125 | -$906,177 | -0.75% | |
| Nuance Investments, Llc | 10.14% | 1,603,748 | $72,713,945 | $72,168,660 | -$545,285 | -0.75% | |
| Geode Capital Management, Llc | 0.00% | 1,475,405 | $66,907,180 | $66,393,225 | -$513,955 | -0.77% | |
| Storebrand Asset Management As | 0.02% | 1,210,420 | $65,178,151 | $54,468,900 | -$10,709,251 | -16.43% | |
| Fmr Llc | 0.00% | 1,390,014 | $63,023,240 | $62,550,630 | -$472,610 | -0.75% | |
| First Trust Advisors Lp | 0.04% | 1,354,165 | $61,397,834 | $60,937,425 | -$460,409 | -0.75% | |
| Dimensional Fund Advisors Lp | 0.01% | 1,158,359 | $52,522,124 | $52,126,155 | -$395,969 | -0.75% | |
| Morgan Stanley | 0.00% | 1,118,705 | $50,722,161 | $50,341,725 | -$380,436 | -0.75% | |
| Invesco Ltd. | 0.01% | 1,002,232 | $45,441,200 | $45,100,440 | -$340,760 | -0.75% | |
| Legal & General Group Plc | 0.01% | 777,542 | $35,253,755 | $34,989,390 | -$264,365 | -0.75% | |
| Charles Schwab Investment Management Inc | 0.01% | 728,456 | $33,028,195 | $32,780,520 | -$247,675 | -0.75% | |
| Cbre Investment Management Listed Real Assets Llc | 0.44% | 647,515 | $29,358,330 | $29,138,175 | -$220,155 | -0.75% | |
| Northern Trust Corp | 0.00% | 637,303 | $28,895,319 | $28,678,635 | -$216,684 | -0.75% | |
| Bank Of New York Mellon Corp | 0.00% | 506,702 | $22,973,865 | $22,801,590 | -$172,275 | -0.75% | |
| Nuveen, Llc | 0.01% | 425,114 | $19,274,668 | $19,130,130 | -$144,538 | -0.75% | |
| Triodos Investment Management Bv | 1.42% | 414,000 | $18,770,760 | $18,630,000 | -$140,760 | -0.75% | |
| Beck Bode, Llc | 3.16% | 411,714 | $18,667,103 | $18,527,130 | -$139,973 | -0.75% | |
| Vanguard Fiduciary Trust Co | 0.00% | 386,412 | $17,519,920 | $17,388,540 | -$131,380 | -0.75% | |
| Victory Capital Management Inc | 0.01% | 321,315 | $14,568,422 | $14,459,175 | -$109,247 | -0.75% | |
| Raymond James Financial Inc | 0.00% | 294,518 | $13,353,449 | $13,253,310 | -$100,139 | -0.75% | |
| Principal Financial Group Inc | 0.01% | 289,623 | $13,131,507 | $13,033,035 | -$98,472 | -0.75% | |
| Goldman Sachs Group Inc | 0.00% | 283,976 | $12,875,470 | $12,778,920 | -$96,550 | -0.75% | |
| American Century Companies Inc | 0.01% | 261,258 | $11,845,438 | $11,756,610 | -$88,828 | -0.75% | |
| Arrowstreet Capital, Limited Partnership | 0.01% | 257,970 | $11,696,360 | $11,608,650 | -$87,710 | -0.75% | |
| Marshall Wace, Llp | 0.01% | 256,767 | $11,641,818 | $11,554,515 | -$87,303 | -0.75% | |
| Ubs Am, A Distinct Business Unit Of Ubs Asset Management Americas Llc | 0.00% | 234,733 | $10,642,795 | $10,562,985 | -$79,810 | -0.75% | |
| Public Sector Pension Investment Board | 0.03% | 213,166 | $9,664,946 | $9,592,470 | -$72,476 | -0.75% | |
| Qube Research & Technologies Ltd | 0.01% | 186,926 | $8,475,225 | $8,411,670 | -$63,555 | -0.75% | |
| Ubs Group Ag | 0.00% | 185,826 | $8,425,351 | $8,362,170 | -$63,181 | -0.75% | |
| Rhumbline Advisers | 0.01% | 174,397 | $7,907,142 | $7,847,865 | -$59,277 | -0.75% | |
| Aqr Capital Management Llc | 0.00% | 169,731 | $7,695,593 | $7,637,895 | -$57,698 | -0.75% | |
| Proshare Advisors Llc | 0.01% | 152,050 | $6,893,949 | $6,842,250 | -$51,699 | -0.75% | |
| Mariner, Llc | 0.01% | 138,231 | $6,267,264 | $6,220,395 | -$46,869 | -0.75% | |
| Ameriprise Financial Inc | 0.00% | 136,151 | $6,173,100 | $6,126,795 | -$46,305 | -0.75% | |
| Meiji Yasuda Asset Management Co Ltd. | 0.30% | 134,116 | $6,080,819 | $6,035,220 | -$45,599 | -0.75% | |
| Federated Hermes, Inc. | 0.01% | 129,191 | $5,857,520 | $5,813,595 | -$43,925 | -0.75% | |
| Jane Street Group, Llc | 0.01% | 123,278 | $5,589,425 | $5,547,510 | -$41,915 | -0.75% | |
| Bank Of America Corp | 0.00% | 121,899 | $5,526,922 | $5,485,455 | -$41,467 | -0.75% | |
| Swiss National Bank | 0.00% | 117,500 | $5,327,450 | $5,287,500 | -$39,950 | -0.75% | |
| Commonwealth Of Pennsylvania Public School Empls Retrmt Sys | 0.02% | 105,960 | $4,804,227 | $4,768,200 | -$36,027 | -0.75% | |
| Martingale Asset Management L P | 0.12% | 103,980 | $4,714,454 | $4,679,100 | -$35,354 | -0.75% | |
| Crawford Investment Counsel Inc | 0.08% | 102,989 | $4,669,521 | $4,634,505 | -$35,016 | -0.75% | |
| Renaissance Technologies LLC | Jim Simons | 0.01% | 100,400 | $4,552,136 | $4,518,000 | -$34,136 | -0.75% |
| Deutsche Bank Ag\ | 0.00% | 95,417 | $4,326,207 | $4,293,765 | -$32,442 | -0.75% | |
| Trexquant Investment Lp | 0.03% | 86,599 | $3,926,399 | $3,896,955 | -$29,444 | -0.75% | |
| Duff & Phelps Investment Management Co | 0.04% | 85,115 | $3,859,114 | $3,830,175 | -$28,939 | -0.75% |
Frequently asked questions about CWT
Who owns the most CWT stock?
The largest holders of CWT are typically major institutional investors such as asset managers and hedge funds reporting on Form 13F. The table above ranks tracked superinvestors by reported position size using the latest available filings for CALIFORNIA WATER SERVICE GRP (CWT).
Is CWT widely held by superinvestors?
Many widely followed stocks like CWT appear across numerous superinvestor portfolios because of liquidity, index inclusion, and fundamentals. The holder count and table above show how broadly CWT is represented among the institutional managers we track.
What do “Current Estimated Value”, “Gain/loss Since Filing”, and “Estimated Portfolio Performance” mean?
Current Estimated Value is reported share quantity from the latest 13F times our most recent split-adjusted U.S. session close. Gain/loss Since Filing is that estimate minus the reported 13F dollar value; Estimated Portfolio Performance is that difference as a percent of the reported value. Green means the estimate is above the filing value; red means below (not purchase cost). If many filers share the same implied filing price per share, the performance % may match across rows. These are not official fund marks or live quotes.