California Water Service Group (CWT) insider trading
Recent insider transactions reported to the SEC on Form 4 — directors and officers buying or selling their own company’s stock. Sourced directly from public SEC filings, latest filed Sep 8, 2026.
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- Filings shown
- 16
- Open-market buys
- 0
- Open-market sells
- 2
Counts cover the 16 most recent Form 4 filings Tradune holds for CWT (filed Aug 5 – Sep 8, 2026). No completed check of CWT's Form 4 list on SEC EDGAR is on record yet; the latest CWT filing Tradune holds was filed Sep 8, 2026. This is not guaranteed to be the complete record — see CWT's full Form 4 filing history on SEC EDGAR.
Open-market activity, last 90 days
Purchases (Form 4 code P) and sales (code S) on the 16 filings Tradune holds for CWT filed Aug 5 – Sep 8, 2026. Grants, exercises, tax withholding and the other Form 4 transaction codes are left out.
2 open-market sales by Rule 10b5-1 checkbox
- On filings with the 10b5-1 box checked
- 0 sales· 0 sh
- checkbox disclosed
- On filings with the box not checked
- 2 sales· 4,200 sh
- not proof that no plan exists
- Not comparable
- 0 sales· 0 sh
- filed before Apr 1, 2023, or no checkbox value in the filing data
Counts are Form 4 lines as filed. The checkbox is one per filing, so every sale on a filing with the box checked is counted there even if only some of its transactions were under a plan; it records what the filer disclosed, and the three categories are not a judgement about why a sale was made.
| Insider | Buys | Sells | Shares bought | Shares sold | Value |
|---|---|---|---|---|---|
| Thomas M. KrummelDirector | 0 | 1 | — | 3,700 | −$186,351 |
| Lester A. SnowDirector | 0 | 1 | — | 500 | −$25,105 |
Value = shares × the price reported on each Form 4 (+ purchases, − sales); every open-market line in this window disclosed a price.
Summarises ~90 days of public SEC Form 4 activity — more distinct buyers, officer involvement and net buying score higher. A description of filing activity, not a rating or buy signal. How this score is computed →
How to read this: an open-market purchase (Form 4 code P) is a buy at the market price with the insider’s own money, as opposed to a grant, award or option exercise; an open-market sale is code S. When two or more distinct insiders report open-market purchases in the same 90-day window, this site labels that a cluster — a definition, not a forecast; see insider cluster buying. “Held after” is Form 4 Table I column 5; “Change” = shares ÷ holdings before the trade (held after − shares for an acquisition, held after + shares for a disposition).
Insider Buying at CWT
No open-market insider purchases (Form 4 code P) were reported for CWT in the trailing 90 days. The filings below may include other transaction types — sales, grants, option exercises, and tax withholding — shown for completeness; they are not open-market purchases.
Recent Form 4 filings
Source: SEC EDGAR Form 4 · transaction codes explained
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Tax withholding | 50 | $50.03 | 8,287 | −0.6% | Sep 5, 2026 |
| Tax withholding | 51 | $50.03 | 8,337 | −0.6% | Sep 4, 2026 |
† change in this filer’s own reported holding line (Form 4 Table I, col. 5), not of total company ownership; small prior holdings produce large percentages, so under 100 shares the prior holding is shown instead.
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Tax withholding | 38 | $50.03 | 5,126 | −0.7% | Sep 5, 2026 |
| Tax withholding | 64 | $50.03 | 5,164 | −1.2% | Sep 4, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Tax withholding | 69 | $50.03 | 4,574 | −1.5% | Sep 5, 2026 |
| Tax withholding | 71 | $50.03 | 4,643 | −1.5% | Sep 4, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Tax withholding | 40 | $50.03 | 8,259 | −0.5% | Sep 5, 2026 |
| Tax withholding | 41 | $50.03 | 8,299 | −0.5% | Sep 4, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Tax withholding | 30 | $50.03 | 5,690 | −0.5% | Sep 5, 2026 |
| Tax withholding | 30 | $50.03 | 5,720 | −0.5% | Sep 4, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Tax withholding | 67 | $50.03 | 8,252 | −0.8% | Sep 5, 2026 |
| Tax withholding | 69 | $50.03 | 8,319 | −0.8% | Sep 4, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Tax withholding | 66 | $50.03 | 14,805 | −0.4% | Sep 5, 2026 |
| Tax withholding | 68 | $50.03 | 14,871 | −0.5% | Sep 4, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Tax withholding | 72 | $50.03 | 23,613 | −0.3% | Sep 5, 2026 |
| Tax withholding | 75 | $50.03 | 23,685 | −0.3% | Sep 4, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Tax withholding | 73 | $50.03 | 12,807 | −0.6% | Sep 5, 2026 |
| Tax withholding | 75 | $50.03 | 12,880 | −0.6% | Sep 4, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Tax withholding | 68 | $50.03 | 23,744 | −0.3% | Sep 5, 2026 |
| Tax withholding | 70 | $50.03 | 23,812 | −0.3% | Sep 4, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Tax withholding | 48 | $50.03 | 6,486 | −0.7% | Sep 5, 2026 |
| Tax withholding | 50 | $50.03 | 6,534 | −0.8% | Sep 4, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Tax withholding | 493 | $50.03 | 147,287 | −0.3% | Sep 5, 2026 |
| Tax withholding | 505 | $50.03 | 147,780 | −0.3% | Sep 4, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Tax withholding | 42 | $50.03 | 2,979 | −1.4% | Sep 4, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Open-market sale 10b5-1 box not checked | 500 | $50.21 | 17,817 | −2.7% | Sep 1, 2026 |
“10b5-1 box checked” = the filer checked the Form 4 box stating that a transaction on the filing was made under a plan intended to satisfy Rule 10b5-1(c); “10b5-1 box not checked” = the box was left blank, which does not prove that no plan exists. The box applies to Form 4s filed from April 1, 2023; older filings, and boxes we could not read, carry no tag. What the 10b5-1 box means.
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Open-market sale 10b5-1 box not checked | 3,700 | $50.37 | 20,104 | −16% | Aug 13, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Grant / award | 446 | — | 1,311 | +52% | Aug 4, 2026 |
Insider filings reported around the same time
Other companies whose most recent Form 4 was filed closest to CWT's (Sep 8, 2026).
Frequently asked about CWT insider activity
How many insiders bought CWT stock in the last 90 days?
No open-market purchases (Form 4 code P) of CWT shares were reported by California Water Service Group insiders in the trailing 90 days. The 16 filings shown on this page cover other transaction types — sales, grants, option exercises, and tax withholding.
Who filed the most recent Form 4 for CWT?
The most recent Form 4 on this page was filed by Kristan A. Hamner (VP, Chief Human Resource Offcr) on Sep 8, 2026, reporting 1 transaction. The original document is linked from the filing list above on SEC EDGAR. Amended filings (Form 4/A) may later revise reported figures.
What was the largest open-market CWT insider sale shown?
The largest open-market sale among the filings shown was 3,700 CWT shares at $50.37 (about $186,351) by Thomas M. Krummel (Director) on Aug 13, 2026. Value is shares × the price reported on the Form 4; its Rule 10b5-1 box is not checked.
New to Form 4s? The transaction codes, the 90-day window and the 0–100 score are defined on the insider-activity score methodology page.
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Track CWT insider filings free →This score summarizes SEC Form 4 filing activity over the trailing 90 days. It is descriptive, not predictive — not a rating, recommendation, or investment advice. Data: SEC EDGAR (public domain), as filed; amendments may revise figures. Tradune is not a registered investment adviser.
Data as filed; amended filings (Form 4/A) may revise figures. Sales may occur under prearranged Rule 10b5-1 trading plans.