Over the past year there were no insider purchases at Westlake Corp. Three insiders sold roughly $10.2 million instead.
Selling on its own is common and often pre-planned (10b5-1 plans, taxes, diversification), so it matters more when it is unusually heavy or broad.
Quarter by quarter: Last full quarter: net selling by insiders. Insiders bought in 1 of the last 7 full quarters. Big money check: 358 institutions held WLK as of Q2 2026, and funds were split between buying and selling.
| Filed | Insider | Role | Type | Shares | Price | Value | Source |
|---|---|---|---|---|---|---|---|
| Aug 11, 2026 | Chao Albert | Chair | Sell | 31,384 | $80.42 | $2.5M | SEC |
| Aug 11, 2026 | Chao Albert | Chair | Sell | 7,489 | $79.70 | $597K | SEC |
| Mar 31, 2026 | Buesinger Robert F. | Executive Officer | Sell | 4,000 | $115.25 | $461K | SEC |
| Mar 30, 2026 | Bender Mark Steven | CFO | Sell | 16,413 | $112.54 | $1.8M | SEC |
| Mar 2, 2026 | Bender Mark Steven | CFO | Sell | 421 | $101.52 | $43K | SEC |
| Mar 2, 2026 | Bender Mark Steven | CFO | Sell | 16,988 | $100.91 | $1.7M | SEC |
| Dec 23, 2025 | Chao Albert | Chair | Sell | 521 | $74.44 | $39K | SEC |
| Dec 23, 2025 | Chao Albert | Chair | Sell | 9,711 | $72.82 | $707K | SEC |
| Dec 23, 2025 | Chao Albert | Chair | Sell | 30,604 | $73.80 | $2.3M | SEC |
| Jun 9, 2025 | Buesinger Robert F. | Executive Officer | Buy | 83 | $93.39 | $8K | SEC |
| Jun 9, 2025 | Buesinger Robert F. | Executive Officer | Sell | 83 | $72.70 | $6K | SEC |
| Dec 2, 2024 | Chao David Tsung-Hung | Director | Sell | 1,750 | $129.08 | $226K | SEC |
| Nov 25, 2024 | Chao David Tsung-Hung | Director | Sell | 1,750 | $130.00 | $228K | SEC |
| May 13, 2024 | Buesinger Robert F. | Executive Officer | Sell | 3,500 | $158.50 | $555K | SEC |
| May 6, 2024 | Bender Mark Steven | CFO | Sell | 4,950 | $152.19 | $753K | SEC |
In the last 12 months Westlake Corp insiders made open-market purchases worth about $0 and sales worth about $10.2 million. Data comes from SEC Form 4 filings, updated every 30 minutes on CapitalSnitch.
The most recent open-market insider trade in WLK was filed on 2026-08-11.
358 investment managers reported holding WLK in SEC Form 13F filings for Q2 2026.
No congressional trades in WLK were reported in the past two years. The full list is free on CapitalSnitch.
Public-record data for research and education, not investment advice. Insider sales are often pre-planned (10b5-1). Congress data: Data derived from public disclosures filed under the Ethics in Government Act and the STOCK Act, republished free for public transparency and news reporting. Disclosures may lag the trade by 45 days or more and show amounts only as ranges. This data may not be used for credit rating, loan underwriting, solicitation of money (political, charitable or other), direct-mail or commercial targeting (5 U.S.C. 13107).