Westlake Corp (WLK) insider trading
Every open-market stock purchase and sale by Westlake Corp executives, directors, large shareholders and members of Congress, from SEC Form 4 filings. Sector: Other.
Insider activity at a glance
- Insiders sold $7.1M over the last 12 months (4 sales). No open-market buys.
- Last insider buy: Robert F. Buesinger (VP), $7.8K, 17 months ago.
Last 12 months: insiders bought $0 (0 buys) and sold $7.1M (4 sales). Last close $85.26 on Jun 7, 2026.
Recent WLK insider trades
| Date | Insider | Trade | Value |
|---|---|---|---|
| Jun 15, 2026 | Jonathan Baksht (CFO) | Bought (not open market) | — |
| May 13, 2026 | Mark Steven Bender (CFO) | Sold (not open market) | $514K |
| May 12, 2026 | Mark Steven Bender (CFO) | Bought (not open market) | — |
| Apr 2, 2026 | Brian John Powers (VP) | Bought (not open market) | — |
| Mar 27, 2026 | Mark Steven Bender (CFO) | Sold | $1.8M |
| Mar 27, 2026 | Robert F. Buesinger (VP) | Sold | $461K |
| Feb 27, 2026 | Mark Steven Bender (CFO) | Sold | $1.7M |
| Feb 27, 2026 | Mark Steven Bender (CFO) | Sold (not open market) | $1.2M |
| Feb 27, 2026 | Mark Steven Bender (CFO) | Sold | $42.7K |
| Feb 27, 2026 | Mark Steven Bender (CFO) | Bought (not open market) | — |
| Feb 27, 2026 | Mark Steven Bender (CFO) | Bought (not open market) | — |
| Feb 20, 2026 | Albert Chao (Chair) | Sold (not open market) | $235K |
| Feb 20, 2026 | James Chao (Chair) | Sold (not open market) | $148K |
| Feb 20, 2026 | Mark Steven Bender (CFO) | Sold (not open market) | $41.9K |
| Feb 20, 2026 | L. Benjamin Ederington (VP) | Sold (not open market) | $33.6K |
| Feb 20, 2026 | Robert F. Buesinger (VP) | Sold (not open market) | $30.7K |
| Feb 20, 2026 | John Tsung-chen Chao (Insider) | Sold (not open market) | $8.6K |
| Feb 20, 2026 | Scott Thomas Szwejbka (VP) | Sold (not open market) | $8.6K |
| Feb 20, 2026 | Jeffrey Adam Holy (C-suite exec) | Sold (not open market) | $7.6K |
| Feb 20, 2026 | James Chao (Chair) | Bought (not open market) | — |
| Feb 20, 2026 | Jean-Marc Gilson (CEO) | Bought (not open market) | — |
| Feb 20, 2026 | Robert F. Buesinger (VP) | Bought (not open market) | — |
| Feb 20, 2026 | John Tsung-chen Chao (Insider) | Bought (not open market) | — |
| Feb 20, 2026 | John Tsung-chen Chao (Insider) | Bought (not open market) | — |
| Feb 20, 2026 | Scott Thomas Szwejbka (VP) | Bought (not open market) | — |
Who's trading WLK
- Jonathan Baksht, CFO: other filings, last Jun 15, 2026
- Mark Steven Bender, CFO: sold $3.6M (3 sales), last May 13, 2026
- Brian John Powers, VP: other filings, last Apr 2, 2026
- Robert F. Buesinger, VP: sold $461K (1 sale), last Mar 27, 2026
- Bhavesh V. Patel, Insider: other filings, last Feb 20, 2026
- Jeffrey Adam Holy, C-suite exec: other filings, last Feb 20, 2026
- James Chao, Chair: other filings, last Feb 20, 2026
- John Tsung-chen Chao, Insider: other filings, last Feb 20, 2026
- L. Benjamin Ederington, C-suite exec: other filings, last Feb 20, 2026
- Jean-Marc Gilson, CEO: other filings, last Feb 20, 2026
- Scott Thomas Szwejbka, VP: other filings, last Feb 20, 2026
- Albert Chao, Chair: sold $3M (3 sales), last Feb 20, 2026
- Roger A Cregg, Insider: other filings, last Dec 10, 2025
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