SEC Form 4
California Water Service (CWT) insider trading
In the 12 months to Oct 24, 2026, 5 CWT insiders reported open-market sales of $664.3K across 7 filings; one SVP CFO and treasurer bought $23.5K.
Latest filing · Last 12 months · Source: SEC EDGAR · How we count
- Open-market sales
- $664.3K
- 7 filings · 5 insiders
- Open-market purchases
- $23.5K
- 1 filing · James Patrick Lynch, SVP CFO and Treasurer
Who traded CWT, and when
- Purchase
- Sale
CWT daily close from Oct 24, 2025 to Oct 23, 2026, between $42.24 and $52.44, last $48.04. 7 sale and 1 purchase filings by 6 insiders, marked at their filing dates. Thomas M. Krummel, Director: sold $346.6K across 2 filings, first filed May 21, 2026, last Aug 14, 2026. Michael S. Mares JR., Vice President, Operations: sold $171.2K across 1 filing, first filed Mar 24, 2026, last Mar 24, 2026. Lester A. Snow, Director: sold $73.5K across 2 filings, first filed May 27, 2026, last Sep 1, 2026. Michelle R. Mortensen, VP, Corp Sec &Chief of Staff: sold $40.0K across 1 filing, first filed Dec 23, 2025, last Dec 23, 2025. Michael B. Luu, Sr. VP Corp Svcs & Chief Risk: sold $32.9K across 1 filing, first filed Mar 24, 2026, last Mar 24, 2026. James Patrick Lynch, SVP CFO and Treasurer: bought $23.5K across 1 filing, first filed Dec 11, 2025, last Dec 11, 2025.
Largest mark · tap a row for others
Thomas M. Krummel · Director
Sale $186,351
3,700 shares at $50.37 avg
Filed Aug 14, 2026 · traded Aug 13
Close on filing date $50.40
Thomas M. Krummel · Director
Director
$346.6K soldMichael S. Mares JR. · Vice President, Operations
Vice President, Operations
$171.2K soldLester A. Snow · Director
Director
$73.5K soldMichelle R. Mortensen · VP, Corp Sec &Chief of Staff
VP, Corp Sec &Chief of Staff
$40.0K soldMichael B. Luu · Sr. VP Corp Svcs & Chief Risk
Sr. VP Corp Svcs & Chief Risk
$32.9K soldJames Patrick Lynch · SVP CFO and Treasurer
SVP CFO and Treasurer
$23.5K boughtHas California Water Service's CEO sold stock?
No. Martin A. Kropelnicki (CEO) made no open-market sales filed as CEO in the last 12 months.
Open-market trades
8 filings in the last 12 months| Insider | Role | Sold | Bought | Filings | Pre-arranged (10b5-1) | Last filed |
|---|---|---|---|---|---|---|
| Thomas M. Krummel | Director | $346.6K | — | 2 | — | |
| Michael S. Mares JR. | Vice President, Operations | $171.2K | — | 1 | — | |
| Lester A. Snow | Director | $73.5K | — | 2 | — | |
| Michelle R. Mortensen | VP, Corp Sec &Chief of Staff | $40.0K | — | 1 | — | |
| Michael B. Luu | Sr. VP Corp Svcs & Chief Risk | $32.9K | — | 1 | — | |
| James Patrick Lynch | SVP CFO and Treasurer | — | $23.5K | 1 | — |
| Filed | Insider | Type | Shares | Avg price | Value | Held after | Source |
|---|---|---|---|---|---|---|---|
traded | Lester A. Snow Director | Sale | 500 | $50.21 | $25.1K | 17,817 | |
traded | Thomas M. Krummel Director | Sale | 3,700 | $50.37 | $186.4K | 20,104 | |
traded | Lester A. Snow Director | Sale | 1,100 | $44.00 | $48.4K | 18,316 | |
traded | Thomas M. Krummel Director | Sale | 3,700 | $43.30 | $160.2K | 23,805 | |
traded | Michael S. Mares JR. Vice President, Operations | Sale | 3,892 | $44.00 | $171.2K | 8,525 | |
traded | Michael B. Luu Sr. VP Corp Svcs & Chief Risk | Sale | 740 | $44.53 | $32.9K | 23,655 | |
traded | Michelle R. Mortensen VP, Corp Sec &Chief of Staff | Sale | 924 | $43.34 | $40.0K | 11,512 | |
traded | James Patrick Lynch SVP CFO and Treasurer | Purchase | 550 | $42.80 | $23.5K | 4,619 |
GET /stocks/filings/vX/form-4?tickers=CWT&filing_date.gte=2025-10-24&sort=filing_date.desc&limit=500{
"status": "OK",
"results": [
{
"tickers": [
"CWT"
],
"issuer_cik": "0001035201",
"owner_cik": "0001513841",
"accession_number": "0001214659-26-011304",
"form_type": "4",
"filing_date": "2026-09-01",
"period_of_report": "2026-09-01",
"issuer_name": "CALIFORNIA WATER SERVICE GROUP",
"issuer_trading_symbol": "CWT",
"owner_name": "Snow Lester A",
"is_director": true,
"is_officer": false,
"is_ten_percent_owner": false,
"is_other": false,
"security_type": "non_derivative",
"record_type": "transaction",
"security_title": "Common Stock",
"transaction_timeliness": "O",
"aff_10b5_one": false,
"transaction_date": "2026-09-01",
"transaction_code": "S",
"equity_swap_involved": false,
"transaction_shares": 500,
"transaction_price_per_share": 50.21,
"transaction_acquired_disposed": "D",
"shares_owned_following_transaction": 17816.922,
"transaction_value": 25105,
"direct_or_indirect": "D",
"footnotes": [
{
"id": "F1",
"description": "This transaction was a single trade at a price of $50.21."
}
]
},
{
"tickers": [
"CWT"
],
"issuer_cik": "0001035201",
"owner_cik": "0001495768",
"accession_number": "0001214659-26-010432",
"form_type": "4",
"filing_date": "2026-08-14",
"period_of_report": "2026-08-13",
"issuer_name": "CALIFORNIA WATER SERVICE GROUP",
"issuer_trading_symbol": "CWT",
"owner_name": "Krummel Thomas M",
"is_director": true,
"is_officer": false,
"is_ten_percent_owner": false,
"is_other": false,
"security_type": "non_derivative",
"record_type": "transaction",
"security_title": "Common Stock",
"transaction_timeliness": "O",
"aff_10b5_one": false,
"transaction_date": "2026-08-13",
"transaction_code": "S",
"equity_swap_involved": false,
"transaction_shares": 3700,
"transaction_price_per_share": 50.365,
"transaction_acquired_disposed": "D",
"shares_owned_following_transaction": 20103.922,
"transaction_value": 186350.5,
"direct_or_indirect": "D"
}
]
}
// trimmed to 2 resultsThe response includes every Form 4 record; this page keeps open-market purchases and sales on common stock and removes duplicate joint-filer rows.
Other insider activity (not market trades) · 166 records
- Tax withholding126 records
- Grants and awards38 records
- Gifts1 record
- Other1 record
Reported on Form 4 but not purchases or sales in the market, so not counted in the totals above.
Build this yourself
This page joins two Massive endpoints: Form 4 filings and daily prices. Ask an agent to watch for new filings:
Using the Massive API (massive.com/docs/llms.txt), check Form 4 filings for CWT every day with transaction_code=P and tell me when an insider files an open-market purchase, with their role, shares, price and the filing link.
How to read this page
- Open-market purchase or sale
- A buy or sell of the company's stock at market price. Grants, option exercises, shares withheld for tax, gifts and employee stock plan purchases are listed separately and not counted.
- Filing date
- Insiders have two business days to report a trade. Totals and the chart use the filing date, when the trade became public.