California Water Service Group (CWT)
CWT moved a median of -0.07% 30 minutes after news, and -0.18% by the close. How CWT actually reacts to news — the realized, point-in-time move the market made, measured across 572 labeled events over the last three years with zero look-ahead.
CWT’s median reaction, across the day.
| Horizon | Median | % positive | Events |
|---|---|---|---|
| 5-min | +0.05% | 54% | 571 |
| 30-min | -0.07% | 46% | 572 |
| 60-min | -0.11% | 38% | 572 |
| to close | -0.18% | 40% | 572 |
| Middle 50% of CWT reactions | -0.62% to +0.32% |
|---|---|
| Median reaction (30-min) | -0.07% |
| Measured reactions | 572 |
Half of all California Water Service Group news events land between -0.62% and +0.32% at 30 minutes.
Reaction stats as of 2026-09-21. Newest measured event . Reaction = percent move vs. the price at the news timestamp.
Email me when CWT moves on news.
One email per qualifying move — the headline, the measured reaction, and how it compares to CWT's baseline. Nothing else.
Recent CWT events, each with its measured reaction.
| Date | Headline | Event | Source | 5-min | To close |
|---|---|---|---|---|---|
| California Water Service Group Prices $125 Million of Senior Unsecured Notes and California Water Service Company Prices $150 Million of First Mortgage Bonds | Press release | GlobeNewswire | -0.71% | -1.50% | |
| Form 8-K CALIFORNIA WATER SERVICE For: Oct 14 | SEC filing · Form 8-K | SEC EDGAR | +0.03% | -0.35% | |
| Hawaii Public Utilities Commission Issues General Rate Case Decision for Hawaii Water Service’s Kapalua Water and Wastewater Systems | Press release | GlobeNewswire | -1.44% | -0.28% | |
| California Water Service Group Schedules 2026 Third-Quarter Earnings Results Announcement and Conference Call | Press release | GlobeNewswire | -0.17% | +0.77% | |
| California Water Service Group Chairman & CEO Joins Alliance for Critical Infrastructure (ACI) Board of Directors | Press release | GlobeNewswire | -0.01% | -2.11% | |
| WUTC Issues Decision in Washington Water’s Application to Recover Costs for Investments to Provide Safe, Reliable Service | Press release | GlobeNewswire | +0.00% | -2.05% | |
| California Water Service Kicks Off Back-to-School Season With 13th Year of Tap Into Learning Program | Press release | GlobeNewswire | +0.12% | -0.84% | |
| Newsweek Names California Water Service Group One of “America’s Greatest Companies” | Press release | GlobeNewswire | +0.11% | +0.82% | |
| Hawaii Water Service Proposes Rate Adjustment for Kona Service Area for Investments Made to Help Keep Service Safe, Reliable | Press release | GlobeNewswire | +0.17% | -0.94% | |
| California Water Service Group Awards $80,000 in Scholarships, Nears $1 Million Milestone Investing in its Communities’ Future Leaders | Press release | GlobeNewswire | +0.34% | +0.54% | |
| California Water Service Group Named One of “World’s Greenest Companies” by Newsweek | Press release | GlobeNewswire | -0.18% | -0.58% | |
| California Water Service and County of Tulare Complete Project to Bring Safe, Reliable Water to Harrison Road Water Users | Press release | GlobeNewswire | +0.35% | +2.65% | |
| Form 10-Q CALIFORNIA WATER SERVICE For: Jun 30 | SEC filing · Form 10-Q | SEC EDGAR | -0.16% | -1.37% | |
| Form 8-K CALIFORNIA WATER SERVICE For: Jul 29 | SEC filing · Form 8-K | SEC EDGAR | -1.16% | -5.71% | |
| California Water Service Group Board of Directors Declares 326th Consecutive Quarterly Dividend | Press release | GlobeNewswire | -1.16% | -5.71% | |
| California Water Service Group Reports Strong Second Quarter 2026 Financial Results | Press release | GlobeNewswire | -1.16% | -5.71% | |
| Form 8-K CALIFORNIA WATER SERVICE For: Jul 29 | SEC filing · Form 8-K | SEC EDGAR | -1.16% | -5.71% | |
| Newsweek Names California Water Service One of America’s Greatest Workplaces | Press release | GlobeNewswire | -0.03% | +0.10% | |
| California Water Service Group Schedules 2026 Second-Quarter Earnings Results Announcement and Conference Call | Press release | GlobeNewswire | +0.27% | +0.81% | |
| California Water Service Completes Acquisition Of Palm Mutual Water Company | Press release | GlobeNewswire | +0.63% | +1.64% | |
| California Water Service Earns G480 Platinum Certification for Water-Use Efficiency, Conservation Program | Press release | GlobeNewswire | -0.35% | +2.81% | |
| Form 8-K CALIFORNIA WATER SERVICE For: May 20 | SEC filing · Form 8-K | SEC EDGAR | +0.00% | +2.02% | |
| California Water Service Group Promotes Tamara S. Johnson to Vice President, California Operations and Gregory D. Shimansky to Vice President, Rates and Regulatory Affairs | Press release | GlobeNewswire | -0.74% | -0.21% | |
| Form 8-K CALIFORNIA WATER SERVICE For: May 20 | SEC filing · Form 8-K | SEC EDGAR | -0.74% | -0.21% | |
| California Water Service Group Highlights Leadership in Environmental Stewardship and Corporate Citizenship in 2025 Sustainability Report | Press release | GlobeNewswire | +0.00% | +0.16% | |
| TIME Names California Water Service Group One of the World’s Most Impactful Companies | Press release | GlobeNewswire | +0.03% | -0.07% | |
| Form 8-K CALIFORNIA WATER SERVICE For: Apr 30 | SEC filing · Form 8-K | SEC EDGAR | +0.82% | -0.47% | |
| California Public Utilities Commission Issues Decision in California Water Service’s 2024 General Rate Case, Infrastructure Improvement Plan | Press release | GlobeNewswire | +0.82% | -0.47% | |
| Form 10-Q CALIFORNIA WATER SERVICE For: Mar 31 | SEC filing · Form 10-Q | SEC EDGAR | -0.04% | -4.69% | |
| Form 8-K CALIFORNIA WATER SERVICE For: Apr 29 | SEC filing · Form 8-K | SEC EDGAR | +0.69% | -5.90% | |
| California Water Service Group Board of Directors Declares 325th Consecutive Quarterly Dividend | Press release | GlobeNewswire | +0.69% | -5.90% | |
| California Water Service Group Reports First Quarter 2026 Financial Results & Provides Update on 2024 California General Rate Case | Press release | GlobeNewswire | +0.69% | -5.90% | |
| Form 8-K CALIFORNIA WATER SERVICE For: Apr 29 | SEC filing · Form 8-K | SEC EDGAR | +0.69% | -5.90% | |
| Form DEFA14A CALIFORNIA WATER SERVICE | SEC filing · Form DEFA14A | SEC EDGAR | -0.23% | +0.97% | |
| California Water Service Group Earns 2026 National USA Today Top Workplaces Award | Press release | GlobeNewswire | -0.07% | -0.27% | |
| California Water Service Group Schedules 2026 First-Quarter Earnings Results Announcement and Conference Call | Press release | GlobeNewswire | -0.47% | -0.66% | |
| Form ARS CALIFORNIA WATER SERVICE For: Dec 31 | SEC filing · Form ARS | SEC EDGAR | -0.62% | +1.13% | |
| Form DEF 14A CALIFORNIA WATER SERVICE For: May 20 | SEC filing · Form DEF | SEC EDGAR | -0.62% | +1.13% | |
| California Water Service Group Earns Spot on Newsweek’s “Most Trustworthy Companies in America” List for Fourth Time | Press release | GlobeNewswire | -0.41% | -1.06% | |
| California Water Service Group Named One of America’s Most Charitable Companies by Newsweek | Press release | GlobeNewswire | -1.30% | -1.41% | |
| Form 8-K CALIFORNIA WATER SERVICE For: Mar 17 | SEC filing · Form 8-K | SEC EDGAR | +0.25% | -0.98% | |
| California Water Service Group Receives Proposed Decision on 2024 California General Rate Case | Press release | GlobeNewswire | +0.25% | -0.98% | |
| Form 8-K CALIFORNIA WATER SERVICE For: Mar 02 | SEC filing · Form 8-K | SEC EDGAR | -0.04% | -1.06% | |
| Form 10-K CALIFORNIA WATER SERVICE For: Dec 31 | SEC filing · Form 10-K | SEC EDGAR | +0.55% | +0.69% | |
| California Water Service Group Announces Agreement to Purchase Nexus Water Group’s Nevada and Oregon Water and Wastewater Systems, Solidifying Its Position as the Largest Regulated Water Utility in the Western U.S. and Creating a Platform for Additional G | Press release | GlobeNewswire | +2.06% | -0.25% | |
| California Water Service Group Reports Solid Q4 and YE 2025 Results | Press release | GlobeNewswire | +2.06% | -0.25% | |
| Form 8-K CALIFORNIA WATER SERVICE For: Feb 25 | SEC filing · Form 8-K | SEC EDGAR | +2.06% | -0.25% | |
| California Water Service Group Donates Nearly $1.9 Million to Improve Local Quality of Life in 2025 | Press release | GlobeNewswire | +0.00% | +0.46% | |
| California Water Service Group Opens 13th Annual Scholarship Program to Students in its Service Areas | Press release | GlobeNewswire | +0.00% | -1.30% | |
| California Water Service Group Schedules 2025 Full-Year and Fourth-Quarter Earnings Results Announcement and Conference Call | Press release | GlobeNewswire | +0.23% | -1.44% |
Each reaction is the move the market actually made, measured from the news timestamp. Headlines link through to the CWT section they belong to.
Where else CWT is measured.
CWT earnings → · Analyst actions → · SEC filings →
Other Utilities names, measured the same way
| Ticker | Events | Median 30-min | % positive |
|---|---|---|---|
| FirstEnergy Corp. (FE) | 598 | -0.04% | 46% |
| National Grid Transco, PLC National Grid PLC (NEW) American Depositary Shares (NGG) | 597 | +0.01% | 51% |
| CPFL ENERGIA (CPL) | 555 | 0.00% | 45% |
| SOUTHCROSS ENERGY (SXE) | 541 | +0.15% | 52% |
Same sector, same measurement: percent move vs. the price at the news timestamp, read at 30 minutes. Sample sizes differ, so the medians are comparable but the confidence behind them is not.
All Utilities names, measured the same way →
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Every name we’ve measured, in one place.
How the numbers are made.
How is California Water Service Group's median reaction calculated?
Every labeled CWT news event is measured from its own timestamp: the last trade before the news is the base price, and the move is read at fixed horizons — 30 minutes of trading, then the close. The median across 572 events is what this page reports. Point-in-time, zero look-ahead: no event borrows information from a later one.
What counts as a positive reaction?
Any event whose price move is above zero at the horizon, relative to the last trade before the news timestamp. 46% of CWT's measured events are up at 30 minutes; the rest close the window flat or negative.
How often is this page updated?
The news table refreshes automatically as new events are labeled and priced. The reaction medians are re-pulled in batches from the dataset — the figures here are as of 2026-09-21.
Does CWT's past reaction predict its next one?
No. These are realized facts about past events, not forecasts. They describe a distribution — they say nothing certain about any future move.