Insider Trading
Current insider transactions (SEC Form 4) — buys and sells by officers, directors, and major shareholders.
| Ticker | Insider | Title | Date | Transaction | Price ($) | Shares | Value ($) | SEC Form 4 |
|---|---|---|---|---|---|---|---|---|
| WLK | Chao Albert | Executive Chairman | 08/11/2026 | Verkauf | 80.42 | 31,384 | 2,523,901 | Form 4 |
| WLK | Chao Albert | Executive Chairman | 08/11/2026 | Verkauf | 79.70 | 7,489 | 596,873 | Form 4 |
| WLK | Chao Albert | Executive Chairman | 08/11/2026 | Optionsausübung | 61.87 | 38,873 | 2,404,878 | Form 4 |
| WLK | Sheets Jeffrey Wayne | Director | 08/08/2026 | Optionsausübung | — | 2,168 | — | Form 4 |
| WLK | Sabat Carolyn Chao | Director | 08/08/2026 | Optionsausübung | — | 2,168 | — | Form 4 |
| WLK | Northcutt R Bruce | Director | 08/08/2026 | Optionsausübung | — | 2,168 | — | Form 4 |
| WLK | Mccollum Mark A | Director | 08/08/2026 | Optionsausübung | — | 2,168 | — | Form 4 |
| WLK | Lubel Kimberly S | Director | 08/08/2026 | Optionsausübung | — | 2,168 | — | Form 4 |
| WLK | Graff Michael J | Director | 08/08/2026 | Optionsausübung | — | 2,168 | — | Form 4 |
| WLK | Cregg Roger A | Director | 08/08/2026 | Optionsausübung | — | 2,168 | — | Form 4 |
| WLK | Chao David Tsung-Hung | Director | 08/08/2026 | Optionsausübung | — | 2,168 | — | Form 4 |
| WLK | Chao Catherine T. | Director | 08/08/2026 | Optionsausübung | — | 2,168 | — | Form 4 |
A compact market overview — not investment advice. Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q).