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About WESTLAKE CORP (WLK)
The SEC lists WESTLAKE CORP under CIK 0001262823, in industrial organic chemicals. We track it alongside the rest of the Materials sector.
WLK Form 4 activity by transaction type, last 90 days
| Form 4 transaction type | Transactions | Shares | Total value |
|---|---|---|---|
| Open-market sale | 2 | 38,873 | $3.12M |
| Grant or award | 11 | 23,631 | |
| Option exercise | 20 | 116,770 |
Dollar totals cover purchases and sales only (codes P and S). Grants, option exercises, gifts and tax withholding are counted in shares, because none of them is a trade at a market price.
WLK insider transactions (Form 4)
5365 Form 4 filings on record, the earliest from Nov 25, 2024, newest first. Filing history page 1 of 3.
| Date | Insider | Transaction | Security | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Tommy Darby - Officer | Grant or award | Restricted Stock Units | 1,791 | $0.00 | - | |
 Jeffrey Wayne Sheets - Director | Grant or award | Restricted Stock Units | 2,184 | $0.00 | - | |
 Carolyn Chao Sabat - Director | Grant or award | Restricted Stock Units | 2,184 | $0.00 | - | |
| Bhavesh V. Patel - Director | Grant or award | Restricted Stock Units | 2,184 | $0.00 | - | |
 R. Bruce Northcutt - Director | Grant or award | Restricted Stock Units | 2,184 | $0.00 | - | |
 Mark A. McCollum - Director | Grant or award | Restricted Stock Units | 2,184 | $0.00 | - | |
 Kimberly S. Lubel - Director | Grant or award | Restricted Stock Units | 2,184 | $0.00 | - | |
 Michael J. Graff - Director | Grant or award | Restricted Stock Units | 2,184 | $0.00 | - | |
 Roger A. Cregg - Director | Grant or award | Restricted Stock Units | 2,184 | $0.00 | - | |
 David Tsung-Hung Chao - Director | Grant or award | Restricted Stock Units | 2,184 | $0.00 | - | |
 Catherine T. Chao - Director | Grant or award | Restricted Stock Units | 2,184 | $0.00 | - | |
| Albert Chao - Officer | Option exercise | Common Stock | 38,873 | $61.87 | $2.40M | |
| Albert Chao - Officer | Open-market sale | Common Stock | 7,489 | $79.70 footnote F1 | $597K | |
| Albert Chao - Officer | Open-market sale | Common Stock | 31,384 | $80.42 footnote F2 | $2.52M | |
| Albert Chao - Officer | Option exercise | Employee Option (right to buy) | 38,873 | $0.00 | - | |
| ||||||
| Jeffrey Wayne Sheets - Director | Option exercise | Common Stock | 2,168 | - footnote F1 | - | |
| Jeffrey Wayne Sheets - Director | Option exercise | Restricted Stock Units | 2,168 | $0.00 | - | |
| ||||||
| Carolyn Chao Sabat - Director | Option exercise | Common Stock | 2,168 | - footnote F1 | - | |
| Carolyn Chao Sabat - Director | Option exercise | Restricted Stock Units | 2,168 | $0.00 | - | |
| ||||||
| R. Bruce Northcutt - Director | Option exercise | Common Stock | 2,168 | - footnote F1 | - | |
| R. Bruce Northcutt - Director | Option exercise | Restricted Stock Units | 2,168 | $0.00 | - | |
| ||||||
| Mark A. McCollum - Director | Option exercise | Common Stock | 2,168 | - footnote F1 | - | |
| Mark A. McCollum - Director | Option exercise | Restricted Stock Units | 2,168 | $0.00 | - | |
| ||||||
| Kimberly S. Lubel - Director | Option exercise | Common Stock | 2,168 | - footnote F1 | - | |
| Kimberly S. Lubel - Director | Option exercise | Restricted Stock Units | 2,168 | $0.00 | - | |
| ||||||
| Michael J. Graff - Director | Option exercise | Common Stock | 2,168 | - footnote F1 | - | |
| Michael J. Graff - Director | Option exercise | Restricted Stock Units | 2,168 | $0.00 | - | |
| ||||||
| Roger A. Cregg - Director | Option exercise | Common Stock | 2,168 | - footnote F1 | - | |
| Roger A. Cregg - Director | Option exercise | Restricted Stock Units | 2,168 | $0.00 | - | |
| ||||||
| David Tsung-Hung Chao - Director | Option exercise | Common Stock | 2,168 | - footnote F1 | - | |
| David Tsung-Hung Chao - Director | Option exercise | Restricted Stock Units | 2,168 | $0.00 | - | |
| ||||||
| Catherine T. Chao - Director | Option exercise | Common Stock | 2,168 | - footnote F1 | - | |
| Catherine T. Chao - Director | Option exercise | Restricted Stock Units | 2,168 | $0.00 | - | |
| ||||||
| Jonathan Baksht - Officer | Grant or award | Restricted Stock Units | 20,580 | $0.00 | - | |
 Mark Steven Bender - Officer | Option exercise | Common Stock | 13,164 | $0.00 footnote F1 | - | |
| Mark Steven Bender - Officer | Tax withholding / forfeiture | Common Stock | 5,284 footnote F3 | $97.34 | $514K | |
| Mark Steven Bender - Officer | Option exercise | Restricted Stock Units | 13,164 | $0.00 | - | |
| ||||||
 Brian John Powers - Officer | Grant or award | Restricted Stock Units | 1,961 | $0.00 | - | |
| Robert F. Buesinger - Officer | Open-market sale | Common Stock | 4,000 | $115.25 | $461K | |
| Mark Steven Bender - Officer | Open-market sale | Common Stock | 16,413 | $112.54 footnote F1 | $1.85M | |
| ||||||
| Mark Steven Bender - Officer | Tax withholding / forfeiture | Common Stock | 1,171 | $104.96 | $123K | |
| Mark Steven Bender - Officer | Option exercise | Common Stock | 6,199 | $65.81 | $408K | |
| Mark Steven Bender - Officer | Option exercise | Common Stock | 6,494 | $86.54 | $562K | |
| Mark Steven Bender - Officer | Derivative | Common Stock | 12,693 | $98.20 | $1.25M | |
| Mark Steven Bender - Officer | Open-market sale | Common Stock | 421 | $101.52 | $43K | |
| Mark Steven Bender - Officer | Open-market sale | Common Stock | 16,988 | $100.91 footnote F1 | $1.71M | |
| Mark Steven Bender - Officer | Option exercise | Employee Option (right to buy) | 6,199 | $0.00 | - | |
| Mark Steven Bender - Officer | Option exercise | Employee Option (right to buy) | 6,494 | $0.00 | - | |
| ||||||
| Bhavesh V. Patel | Grant or award | Restricted Stock Units | 1,852 | $0.00 | - | |
| Scott Thomas Szwejbka - Officer | Grant or award | Common Stock | 365 footnote F1 | $0.00 | - | |
| Scott Thomas Szwejbka - Officer | Tax withholding / forfeiture | Common Stock | 91 footnote F2 | $94.10 | $9K | |
| Scott Thomas Szwejbka - Officer | Grant or award | Employee Option (right to buy) | 14,595 | $0.00 | - | |
| Scott Thomas Szwejbka - Officer | Grant or award | Restricted Stock Units | 3,983 | $0.00 | - | |
| ||||||
Item 2.05, 7.01, 9.01
Item 5.02
Item 2.02, 7.01, 9.01
Item 8.01
Recent WLK Form 144 notices of proposed sale
1An insider files Form 144 before selling restricted or control stock. It announces a planned sale. If the sale goes ahead, it shows up later on a Form 4.
| Filed | Filer | Relationship | Shares | Market value | Notice |
|---|---|---|---|---|---|
| ALBERT Y CHAO | Officer, Director | 38,873 | $3.12M | View on EDGAR |
WLK insider trading FAQ
What is the latest insider trade for WLK?
WESTLAKE CORP (WLK) had 21 insider filings in the last 90 days, with the most recent on 2026-09-01. The full record for WLK runs to 65 Form 4 filings, the earliest from 2024-11-25. InsiderAlpha adds new Form 4, Form 144 and 8-K filings as they arrive from SEC EDGAR.
How many insiders are buying WLK stock?
No insider purchases of WLK were filed in the last 90 days. 1 purchase is on record for this company.
How many insiders are selling WLK stock?
2 insider sales of WLK were filed in the last 90 days, totaling $3.12M.
Where can I see WLK SEC filings (Form 4, 10-K, 10-Q, 8-K)?
This page collects WLK Form 4 insider transactions, Form 144 sale notices and 8-K filings in one place. Annual 10-K and quarterly 10-Q reports live on the company's SEC EDGAR page.
More Materials companies with insider activity
Recent insider filings
10The EDGAR links open each original Form 4, so you can check any number on this page against the filing it came from.
- - Tommy Darby view on EDGAR
- - Jeffrey Wayne Sheets view on EDGAR
- - Carolyn Chao Sabat view on EDGAR
- - Bhavesh V. Patel view on EDGAR
- - R. Bruce Northcutt view on EDGAR
- - Mark A. McCollum view on EDGAR
- - Kimberly S. Lubel view on EDGAR
- - Michael J. Graff view on EDGAR
- - Roger A. Cregg view on EDGAR
Related companies with recent insider activity
Learn more
- Insider selling: signal or noise?
- Why most insider sales are routine, and the few patterns worth a second look.
- Form 144 vs Form 4
- A Form 144 announces a planned sale; the Form 4 reports it after it happens.
- Insider activity in Materials
- Where WLK's peers are being bought and sold.
- Every recent Form 4
- The market-wide feed, updated as filings arrive from SEC EDGAR.
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