Dudediligence.

Westlake Corporation

WLKNYSE · Industrial Organic Chemicals
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Last 12 months

Sales planned on beside the trades reported on , and whether each names a .

Planned ·

$11.4M

5 notices · 130,224 sh

Oct 2025 to Oct 2026

Reported ·

$7,069,631

7 sales · 0 buys

Oct 2025 to Jun 2026

The two figures cover different periods.

None of the 7 reported sales carry the 10b5-1 box. Together they are 0.06% of the shares on issue.

PLANNED · FORM 144Oct 2025 to Oct 2026REPORTED · FORM 4Oct 2025 to Jun 2026N2025DJ2026FMAMJJASO2026-08-11: ALBERT Y CHAO, Form 1442026-03-30: ROBERT BUESINGER, Form 1442026-03-27: MARK BENDER, Form 1442026-02-27: MARK BENDER, Form 1442025-12-22: ALBERT Y CHAO, Form 1442025-12-22: Chao Albert, sold2026-02-27: Bender Mark Steven, sold2026-03-27: Bender Mark Steven, sold2026-03-27: Buesinger Robert F., sold
under a no plan named▼ salesize is dollars

Form 144 notices, newest first

2026-08-11ALBERT Y CHAO, Executive Chairman$3,120,728
38,873 shno plan dateForm 4s on file end Jun 23144 ↗
2026-03-30ROBERT BUESINGER, EVP, PEM Segment Head$461,000
4,000 shno plan date144 ↗
Form 4, 2026-03-31: sold 4,000 at $115.25 Form 4 ↗
2026-03-27MARK BENDER, EVP & CFO$1,847,034
16,413 shno plan date144 ↗
Form 4, 2026-03-30: sold 16,413 at $112.54 Form 4 ↗
2026-02-27MARK BENDER, EVP & CFO$3,003,393
30,102 shno plan date144 ↗
Form 4, 2026-03-02: sold 17,409 at $100.92 Form 4 ↗
2025-12-22ALBERT Y CHAO, Executive Chairman$3,004,366
40,836 shno plan date144 ↗
Form 4, 2025-12-23: sold 40,836 at $73.58 Form 4 ↗