California Water Service Group
US ˙ NYSE ˙ US1307881029

SecurityCWT / California Water Service Group
InstitutionComerica Bank
Latest Disclosed Ownership16,234 shares
Latest Disclosed Value $ 703,443
Comerica Bank reports 14.77% decrease in ownership of CWT / California Water Service Group

On January 29, 2026 - Comerica Bank filed a 13F-HR form disclosing ownership of 16,234 shares of California Water Service Group (US:CWT) valued at $703,419 USD as of December 31, 2025. The entity filed a previous 13F-HR on November 14, 2025 disclosing 19,047 shares of California Water Service Group. This represents a change in shares of -14.77% during the quarter. The current value of the position is $734,426 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-01-29 2025-12-31 13F CALIFORNIA WTR SVC GROUP COM 130788102 16,234 -2,813 -14.77 703 -19.57 0.0028
2025-11-14 2025-09-30 13F CALIFORNIA WTR SVC GROUP COM 130788102 19,047 -3,575 -15.80 874 -14.98 0.0033
2025-08-14 2025-06-30 13F CALIFORNIA WTR SVC GROUP COM 130788102 22,622 373 1.68 1,029 -4.64 0.0040
2025-05-14 2025-03-31 13F CALIFORNIA WTR SVC GROUP COM 130788102 22,249 612 2.83 1,078 10.00 0.0045
2025-02-14 2024-12-31 13F/A-1 CALIFORNIA WTR SVC GROUP COM 130788102 21,637 -223 -1.02 981 -17.30 0.0040
2025-02-14 2024-12-31 13F CALIFORNIA WTR SVC GROUP COM 130788102 21,637 -223 981 0.0033
2024-11-14 2024-09-30 13F CALIFORNIA WTR SVC GROUP COM 130788102 21,860 -427 -1.92 1,185 9.72 0.0047
2024-08-15 2024-06-30 13F CALIFORNIA WTR SVC GROUP COMMON 130788102 22,287 -2,992 -11.84 1,081 -8.01 0.0045
2024-05-16 2024-03-31 13F CALIFORNIA WTR SVC GROUP COMMON 130788102 25,279 -6,131 -19.52 1,175 -27.93 0.0051
2024-02-14 2023-12-31 13F CALIFORNIA WTR SVC GROUP COMMON 130788102 31,410 -75 -0.24 1,629 9.40 0.0075
2023-11-21 2023-09-30 13F CALIFORNIA WTR SVC GROUP COMMON 130788102 31,485 31,485 1,490 0.0078
2023-08-22 2023-06-30 13F CALIFORNIA WTR SVC GROUP COM 130788102 0 -42,919 -100.00 0 -100.00
2023-01-26 2022-12-31 13F CALIFORNIA WTR SVC GROUP COM 130788102 42,919 -12,600 -22.69 3 -99.93 0.0209
2022-10-28 2022-09-30 13F CALIFORNIA WTR SVC GROUP COM 130788102 55,519 -4,240 -7.10 3,032 -10.16 0.0256
2022-08-02 2022-06-30 13F CALIFORNIA WTR SVC GROUP COM 130788102 59,759 390 0.66 3,375 1.26 0.0277
2022-04-27 2022-03-31 13F CALIFORNIA WTR SVC GROUP COM 130788102 59,369 10 0.02 3,333 -8.81 0.0242
2022-02-18 2021-12-31 13F CALIFORNIA WTR SVC GROUP COM 130788102 59,359 -1,315 -2.17 3,655 1.78 0.0269
2021-11-22 2021-09-30 13F CALIFORNIA WTR SVC GROUP COM 130788102 60,674 -844 -1.37 3,591 -8.58 0.0216
2021-08-26 2021-06-30 13F CALIFORNIA WTR SVC GROUP COM 130788102 61,518 -3,251 -5.02 3,928 -0.88 0.0235
2021-04-28 2021-03-31 13F CALIFORNIA WTR SVC GROUP COM 130788102 64,769 -1,531 -2.31 3,963 9.99 0.0236
2021-01-28 2020-12-31 13F CALIFORNIA WTR SVC GROUP COM 130788102 66,300 669 1.02 3,603 13.91 0.0229
2020-10-30 2020-09-30 13F CALIFORNIA WTR SVC GROUP COM 130788102 65,631 78 0.12 3,163 -3.54 0.0230
2020-07-31 2020-06-30 13F CALIFORNIA WTR SVC GROUP COM 130788102 65,553 4,674 7.68 3,279 9.92 0.0253
2020-05-01 2020-03-31 13F CALIFORNIA WTR SVC GROUP COM 130788102 60,879 1,584 2.67 2,983 -6.64 0.0274
2020-02-07 2019-12-31 13F CALIFORNIA WTR SVC GROUP COM 130788102 59,295 141 0.24 3,195 -1.21 0.0242
2019-10-31 2019-09-30 13F CALIFORNIA WTR SVC GROUP COM 130788102 59,154 -146 -0.25 3,234 4.56 0.0256
2019-08-02 2019-06-30 13F CALIFORNIA WTR SVC GROUP COM 130788102 59,300 -2,358 -3.82 3,093 -1.87 0.0248
2019-05-02 2019-03-31 13F CALIFORNIA WTR SVC GROUP COM 130788102 61,658 862 1.42 3,152 11.97 0.0255
2019-02-06 2018-12-31 13F CALIFORNIA WTR SVC GROUP COM 130788102 60,796 312 0.52 2,815 11.05 0.0239
2018-11-01 2018-09-30 13F CALIFORNIA WTR SVC GROUP COM 130788102 60,484 -4,301 -6.64 2,535 -3.87 0.0204
2018-08-01 2018-06-30 13F CALIFORNIA WTR SVC GROUP COM 130788102 64,785 341 0.53 2,637 3.74 0.0184
2018-05-01 2018-03-31 13F CALIFORNIA WTR SVC GROUP COM 130788102 64,444 1,172 1.85 2,542 -10.90 0.0182
2018-02-02 2017-12-31 13F CALIFORNIA WTR SVC GROUP COM 130788102 63,272 -1,409 -2.18 2,853 4.16 0.0190
2017-11-06 2017-09-30 13F CALIFORNIA WTR SVC GROUP COM 130788102 64,681 322 0.50 2,739 10.80 0.0198
2017-08-03 2017-06-30 13F CALIFORNIA WTR SVC GROUP COM 130788102 64,359 -2,817 -4.19 2,472 -0.92 0.0185
2017-05-03 2017-03-31 13F CALIFORNIA WTR SVC GROUP COM 130788102 67,176 2,052 3.15 2,495 16.10 0.0189
2017-02-08 2016-12-31 13F CALIFORNIA WTR SVC GROUP COM 130788102 65,124 3,192 5.15 2,149 10.43 0.0170
2016-08-11 2016-06-30 13F CALIFORNIA WTR SVC GROUP COM 130788102 61,932 -704 -1.12 1,946 10.95 0.0168
2016-05-11 2016-03-31 13F CALIFORNIA WTR SVC GROUP COM 130788102 62,636 48,596 346.13 1,754 433.13 0.0157
2016-02-05 2015-12-31 13F CALIFORNIA WTR SVC GROUP COM 130788102 14,040 -211 -1.48 329 4.11 0.0032
2015-11-12 2015-09-30 13F CALIFORNIA WTR SVC GROUP COM 130788102 14,251 -14,251 -50.00 316 -51.53 0.0030
2015-08-13 2015-06-30 13F CALIFORNIA WTR SVC GROUP COM 130788102 28,502 28,502 100.00 652 106.33 0.0028
2015-05-15 2015-03-31 13F CALIFORNIA WTR SVC GROUP COM 130788102 0 -28,244 -100.00 0 -100.00
2015-02-13 2014-12-31 13F CALIFORNIA WTR SVC GROUP COM 130788102 28,244 -18,998 -40.21 696 -34.34 0.0030
2014-10-21 2014-09-30 13F CALIFORNIA WTR SVC GROUP COM 130788102 47,242 -8,942 -15.92 1,060 -22.06 0.0094
2014-08-12 2014-06-30 13F CALIFORNIA WTR SVC GROUP COM 130788102 56,184 1,647 3.02 1,360 4.13 0.0116
2014-05-15 2014-03-31 13F CALIFORNIA WTR SVC GROUP COM 130788102 54,537 -10,676 -16.37 1,306 -13.16 0.0100
2014-02-11 2013-12-31 13F CALIFORNIA WTR SVC GROUP COM 130788102 65,213 48,846 298.44 1,504 353.01 0.0117
2013-11-12 2013-09-30 13F CALIFORNIA WTR SVC GROUP COM 130788102 16,367 5,962 57.30 332 63.55 0.0023
2013-08-13 2013-06-30 13F/A-1 CALIFORNIA WTR SVC GROUP COM 130788102 10,405 10,405 203 0.0017
2013-08-08 2013-06-30 13F CALIFORNIA WTR SVC GROUP COM 130788102 36,362 710
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.