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 4 sales; 348 institutions reported holding it in 13F filings for Q2 2026, worth $2.69B in total; no superinvestor holds it.
Holders of 5% or more of CWT
Holders whose latest Schedule 13D or 13G filing reports 5% or more of California Water Service Group, largest stake first. The change is against the holder's previous filing.
| Holder | Latest form | Stake | Change | First filed | Latest filing | Filing |
|---|---|---|---|---|---|---|
| BlackRock, Inc. | 13G/A | 17.10%10.2M shares | – | Jul 17, 20251 filing | Jul 17, 2025 | SEC |
| Vanguard Portfolio Management LLC | 13G | 7.23%4.31M shares | New | Apr 29, 20261 filing | Apr 29, 2026 | SEC |
| Amundi | 13G/A | 5.32%3.29M shares | −0.51 ppfrom 5.83% | Apr 10, 20263 filings | Oct 26, 2026 | SEC |
| Vanguard Capital Management LLC | 13G | 5.28%3.15M shares | New | Apr 29, 20261 filing | Apr 29, 2026 | SEC |
| T. Rowe Price Investment Management, Inc. | 13G/A | 5.00%2.96M shares | – | Feb 14, 20243 filings | Feb 14, 2025 | SEC |
Stakes are as of each holder's latest filing. Holders whose last filing was in the old format (before December 18, 2024) have no stake on record and are not listed, and after an acquisition or delisting holders usually stop filing.
13D and 13G filings
24 Schedule 13D and 13G filings on California Water Service Group, newest first, including old-format filings without a stake.
| Filed (ET) | Filer | Form | Stake | Change | Event date | Filing |
|---|---|---|---|---|---|---|
| Oct 26, 20263:57 PM ET | Amundiand 1 other | 13G/A | 5.32%3.29M shares | −0.51 ppfrom 5.83% | Sep 30, 2026 | SEC |
| Jul 22, 20269:46 AM ET | Amundiand 1 other | 13G/A | 5.83%3.49M shares | +0.01 ppfrom 5.82% | Jun 30, 2026 | SEC |
| Apr 29, 20265:09 PM ET | Vanguard Capital Management LLC | 13G | 5.28%3.15M shares | New | Mar 31, 2026 | SEC |
| Apr 29, 202612:33 PM ET | Vanguard Portfolio Management LLC | 13G | 7.23%4.31M shares | New | Mar 31, 2026 | SEC |
| Apr 10, 20269:55 AM ET | Amundiand 1 other | 13G | 5.82%3.47M shares | New | Mar 31, 2026 | SEC |
| Mar 26, 20264:43 PM ET | Vanguard Group Inc | 13G/A | 0.00%0 shares | –Below 5% | Mar 13, 2026 | SEC |
| Jul 17, 20258:12 PM ET | BlackRock, Inc. | 13G/A | 17.10%10.2M shares | – | Jun 30, 2025 | SEC |
| Feb 14, 20259:45 AM ET | T. Rowe Price Investment Management, Inc. | 13G/A | 5.00%2.96M shares | – | Dec 31, 2024 | SEC |
| Nov 14, 2024 | T. Rowe Price Investment Management, Inc. | 13G/AOld format | – | – | – | SEC |
| Feb 14, 2024 | T. Rowe Price Investment Management, Inc. | 13GOld format | – | New | – | SEC |
| Feb 13, 2024 | Vanguard Group Inc | 13G/AOld format | – | – | – | SEC |
| Jan 29, 2024 | State Street Corp | 13G/AOld format | – | – | – | SEC |
| Jan 19, 20242:40 PM ET | BlackRock Inc. | 13G/AOld format | – | – | – | SEC |
| Feb 9, 2023 | Vanguard Group Inc | 13G/AOld format | – | – | – | SEC |
| Feb 8, 2023 | State Street Corp | 13G/AOld format | – | – | – | SEC |
| Jan 26, 20238:52 AM ET | BlackRock Inc. | 13G/AOld format | – | – | – | SEC |
| Jan 20, 20239:43 AM ET | BlackRock Inc. | 13GOld format | – | – | – | SEC |
| Feb 10, 2022 | State Street Corp | 13G/AOld format | – | – | – | SEC |
| Feb 9, 2022 | Vanguard Group Inc | 13G/AOld format | – | – | – | SEC |
| Jan 27, 20222:15 PM ET | BlackRock Inc. | 13G/AOld format | – | – | – | SEC |
| Jan 25, 20226:40 PM ET | BlackRock Inc. | 13G/AOld format | – | – | – | SEC |
| Feb 11, 2021 | State Street Corp | 13GOld format | – | New | – | SEC |
| Feb 10, 2021 | Vanguard Group Inc | 13G/AOld format | – | – | – | SEC |
| Jan 25, 20214:50 PM ET | BlackRock Inc. | 13GOld format | – | New | – | SEC |
Form 144: proposed insider sales
12 notices from officers, directors and other affiliates planning to sell California Water Service Group shares, newest first.
| Filed (ET) | Seller | Shares to sell | Market value | Planned sale | Broker | Filing |
|---|---|---|---|---|---|---|
| Nov 6, 202610:57 AM ET | Krummel Thomas MDirector | 3.70K | $187.0K | Nov 6, 2026 | Charles Schwab Corp | SEC |
| Nov 4, 20265:12 PM ET | Carol PottengerDirector | 2.66K | $132.7K | Nov 4, 2026 | Morgan Stanley Smith Barney LLC Executive Financial Services | SEC |
| Aug 13, 202610:18 AM ET | Krummel Thomas MDirector | 3.70K | $184.9K | Aug 13, 2026 | Charles Schwab & Co., Inc. | SEC |
| May 21, 202612:21 PM ET | Krummel Thomas MDirector | 3.70K | $160.4K | May 21, 2026 | Charles Schwab Corporation | SEC |
| Mar 20, 20264:01 PM ET | Michael MaresOfficer | 3.89K | $171.2K | Mar 20, 2026 | Morgan Stanley Smith Barney LLC Executive Financial Services | SEC |
| Nov 22, 20244:25 PM ET | Luu Michael BOfficer · Sr. VP Corp. Svcs. & Chief Risk | 985 | $50.7K | Nov 22, 2024 | Georgeson Securities Corp | SEC |
| Aug 7, 202411:44 AM ET | Krummel Thomas MDirector | 1.67K | $84.9K | Aug 7, 202410b5-1 | THE CHARLES SCHWAB CORPORATION | SEC |
| May 1, 20242:47 PM ET | Krummel Thomas MDirector | 5.00K | $249.8K | May 1, 202410b5-1 | THE CHARLES SCHWAB CORPORATION | SEC |
| Dec 12, 20233:15 PM ET | Mortensen Michelle ROfficer · Corporate Secretary | 675 | $35.5K | Dec 12, 2023 | Georgeson Securities Corp | SEC |
| Nov 3, 20232:55 PM ET | Krummel Thomas MDirector | 5.00K | $249.8K | Nov 2, 202310b5-1 | THE CHARLES SCHWAB CORPORATION | SEC |
| Jun 14, 20238:32 AM ET | Luu Michael BOfficer · VP, Customer Service & IT | 1.84K | $101.0K | Jun 14, 2023 | Georgeson Securities Corp | SEC |
| May 5, 202312:34 PM ET | Kuta Robert JOfficer · VP of Engineering | 1.00K | $56.5K | May 5, 2023 | Georgson Securites Corporation | SEC |