🕵️ Westlake Corp ($WLK)
SEC insider & ownership activity, last 12 months · CIK 1262823 · every row links its SEC filing
Over the last 12 months insiders sold $7.1M with no open-market buying against it. Mark Bender sold $3.6M in discretionary trades (Feb–Mar). No red-flag 8-Ks in the window.
Monthly net open-market insider flow, last 12 months (up = net buying)
Insider flow
0 buyers, $0 (0 lots) · 3 sellers, $7.1M (7 lots)
| Insider | Buys | Bought | Sells | Sold | Last |
|---|---|---|---|---|---|
| Mark Bender | 0 | – | 3 | $3.6M | Mar 27, 2026 |
| Albert Y Chao | 0 | – | 3 | $3.0M | Dec 22, 2025 |
| Robert Buesinger | 0 | – | 1 | $461K | Mar 27, 2026 |
5%+ holders
No current 5%+ beneficial-ownership positions on file.
Planned insider sales (Form 144)
| Seller | Planned | Approx. sale date | |
|---|---|---|---|
| Robert Buesinger | $461K | Mar 30, 2026 | filing ↗ |
| Mark Bender | $1.8M | Mar 27, 2026 | filing ↗ |
| Mark Bender | $3.0M | Feb 27, 2026 | filing ↗ |
| Albert Y Chao | $3.0M | Dec 22, 2025 | filing ↗ |
Material events (8-K)
| Item | Event date | |
|---|---|---|
| Reg FD disclosure (7.01) | Jun 15, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Jun 15, 2026 | filing ↗ |
| Shareholder vote (5.07) | May 14, 2026 | filing ↗ |
| Earnings (2.02) | May 5, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | May 5, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | May 5, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | Apr 27, 2026 | filing ↗ |
| Officer/director changes (5.02) | Apr 15, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | Apr 15, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Apr 15, 2026 | filing ↗ |
| Other events (8.01) | Apr 13, 2026 | filing ↗ |
| Material agreement (1.01) | Apr 2, 2026 | filing ↗ |
| Agreement terminated (1.02) | Apr 2, 2026 | filing ↗ |
| New financial obligation (2.03) | Apr 2, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Apr 2, 2026 | filing ↗ |
| Officer/director changes (5.02) | Mar 30, 2026 | filing ↗ |
| Earnings (2.02) | Feb 24, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | Feb 24, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Feb 24, 2026 | filing ↗ |
| Officer/director changes (5.02) | Feb 19, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | Feb 19, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Feb 19, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | Jan 6, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Jan 6, 2026 | filing ↗ |
| Exit or disposal costs (2.05) | Dec 12, 2025 | filing ↗ |
| Reg FD disclosure (7.01) | Dec 12, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Dec 12, 2025 | filing ↗ |
| Reg FD disclosure (7.01) | Nov 10, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Nov 10, 2025 | filing ↗ |
| Material agreement (1.01) | Nov 4, 2025 | filing ↗ |