Form4insider filings, from the source

Company · CIK 0001035201 · SIC 4941 — Water Supply · NYSE

CALIFORNIA WATER SERVICE GROUP · CWT

Insider activity reported against this company. All insider holders · On EDGAR ↗

1M3M6M1Y2YAll datashares as filed — not split-adjusted
Open-market buys & salesbuys $0 · 0sales $211k · 2net −$211k
$10k$10k$100k$100k$1M$1MbuyssalesMar 28Apr 27May 28Jun 28Jul 29Aug 28Sep 28

Reported at this company — common stock

TradeReported (ET)InsiderSharesAvg priceTotalOwned afterΔ stakeFlags
Sep 4, 2026 FForm 4 →Sep 8, 4:38 pm EDTThomas A ScanlonVP, Corporate Controller & PAO60$50.03$3,0025,690—
Sep 4, 2026 FForm 4 →Sep 8, 4:36 pm EDTTodd Kenneth PetersVice President, Engineering81$50.03$4,0528,259—
Sep 4, 2026 FForm 4 →Sep 8, 4:34 pm EDTElissa Y OuyangVP Facilities Fleet Procure IT134$50.03$6,70414,805—
Sep 4, 2026 FForm 4 →Sep 8, 4:32 pm EDTMichelle R MortensenVP Corp Sect, Gov & Assurance148$50.03$7,40412,807—
Sep 4, 2026 FForm 4 →Sep 8, 4:30 pm EDTMichael S Mares Jr.SVP Operations136$50.03$6,8048,252—
Sep 4, 2026 FForm 4 →Sep 8, 4:28 pm EDTJames Patrick LynchSVP CFO and Treasurer98$50.03$4,9036,486—
Sep 4, 2026 FForm 4 →Sep 8, 4:26 pm EDTMichael B LuuSVP Corp Svce & Chief Risk Of138$50.03$6,90423,744—
Sep 4, 2026 FForm 4 →Sep 8, 4:24 pm EDTMartin A KropelnickiChairman President & CEO998$50.03$49,930147,287—
Sep 4, 2026 FForm 4 →Sep 8, 4:20 pm EDTKenneth G JenkinsVP Water Res Plan & Sustain102$50.03$5,1035,126—
Sep 4, 2026 FForm 4 →Sep 8, 4:16 pm EDTSophie Marwieh JamesVP Water Qual101$50.03$5,0538,287—
Sep 4, 2026 FForm 4 →Sep 8, 4:14 pm EDTKristan A HamnerVP, Chief Human Resource Offcr42$50.03$2,1012,979—
Sep 4, 2026 FForm 4 →Sep 8, 4:11 pm EDTShannon C DeanSVP, Cust Svc & Chief Sust Of147$50.03$7,35423,613—
Sep 4, 2026 FForm 4 →Sep 8, 4:08 pm EDTShawn C BuntingSVP, Chief Legal Officer & BD140$50.03$7,0044,574—
Sep 1, 2026 SForm 4 →Sep 1, 5:07 pm EDTLester A SnowDirector500$50.21$25,10517,817−2.73%
Aug 13, 2026 SForm 4 →Aug 14, 5:13 pm EDTThomas M KrummelDirector3,700$50.37$186,35120,104−15.5%
Aug 4, 2026 AForm 4 →Aug 5, 3:17 pm EDTGregory Dale ShimanskyVP, Rates & Reg Affairs446——1,311—
Jun 4, 2026 FForm 4 →Jun 8, 5:49 pm EDTThomas A ScanlonVP, Corporate Controller & PAO60$45.53$2,7325,723—
Jun 4, 2026 FForm 4 →Jun 8, 5:46 pm EDTTodd Kenneth PetersVice President, Engineering80$45.53$3,6428,340—
Jun 4, 2026 FForm 4 →Jun 8, 5:43 pm EDTElissa Y OuyangVP Facilities Fleet Procure IT133$45.53$6,05514,939—
Jun 4, 2026 FForm 4 →Jun 8, 5:40 pm EDTMichelle R MortensenVP Corp Sect, Gov & Assurance147$45.53$6,69312,954—
Jun 4, 2026 FForm 4 →Jun 8, 5:38 pm EDTGreg A MillemanVP Rates & Regulatory Affairs133$45.53$6,05513,708—
Jun 4, 2026 FForm 4 →Jun 8, 5:36 pm EDTMichael S Mares Jr.SVP Operations137$45.53$6,2378,388—
Jun 4, 2026 FForm 4 →Jun 8, 5:33 pm EDTJames Patrick LynchSVP CFO and Treasurer98$45.53$4,4626,583—
Jun 4, 2026 FForm 4 →Jun 8, 5:31 pm EDTMichael B LuuSVP Corp Svce & Chief Risk Of139$45.53$6,32823,807—
Jun 4, 2026 FForm 4 →Jun 8, 5:29 pm EDTMartin A KropelnickiChairman President & CEO997$45.53$45,390148,285—
Jun 4, 2026 FForm 4 →Jun 8, 5:27 pm EDTKenneth G JenkinsVP Water Res Plan & Sustain101$45.46$4,5915,228—
Jun 4, 2026 FForm 4 →Jun 8, 5:23 pm EDTSophie Marwieh JamesVP Water Qual101$45.53$4,5988,321—
Jun 4, 2026 FForm 4 →Jun 8, 5:20 pm EDTKristan A HamnerVP, Chief Human Resource Offcr41$45.24$1,8553,004—
Jun 4, 2026 FForm 4 →Jun 8, 5:19 pm EDTShannon C DeanSR. VP, Cust Svc & Chief Sust147$45.53$6,69323,742—
Jun 4, 2026 FForm 4 →Jun 8, 5:16 pm EDTShawn C BuntingSr. VP, GC and Business Dev139$45.53$6,3284,714—

Reported at this company — derivatives (options, RSUs, warrants)

No reported derivative activity in this period.