WESTLAKE CORP (WLK)
$75.71+$1.78 (+2.41%) Today
Mark Steven Bender - OfficerMark Steven Bender - OfficerMark Steven Bender - Officer
Jeffrey Wayne Sheets - Director
Carolyn Chao Sabat - DirectorWestlake is a forward-integrated commodity chemicals firm based in Houston. It began as a single low-density polyethylene plant and expanded its capabilities to include ethylene, vinyl chloride monomers, and polyvinyl chloride over the next two decades. The acquisition of Axiall in 2016 made it a North American leader in chlor-alkali and PVC. Today, Westlake has two defined segments: performance and essential materials, and housing and infrastructure products. The HIP segment began operating in 2022 following a series of acquisitions in the building products space. The firm aims to maximize the value of its chemical production by integrating with the HIP segment, realizing the higher margins of finished commercial goods.
| Form 4 transaction type | Transactions | Shares | Total value |
|---|---|---|---|
| Open-market sale | 2 | 38,873 | $3.12M |
| Grant or award | 11 | 42,420 | |
| Option exercise | 20 | 116,770 |
Dollar totals are shown for open-market purchases and sales only. Grants, option exercises, gifts and tax withholding are reported by share count because they are not trades at a market price.
64 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 |
|---|---|---|---|---|---|---|
| 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 | $597K | |
| Albert Chao - Officer | Open-market sale | Common Stock | 31,384 | $80.42 | $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 | - | - | |
| Jeffrey Wayne Sheets - Director | Option exercise | Restricted Stock Units | 2,168 | $0.00 | - | |
| Carolyn Chao Sabat - Director | Option exercise | Common Stock | 2,168 | - | - | |
| Carolyn Chao Sabat - Director | Option exercise | Restricted Stock Units | 2,168 | $0.00 | - | |
| R. Bruce Northcutt - Director | Option exercise | Common Stock | 2,168 | - | - | |
| R. Bruce Northcutt - Director | Option exercise | Restricted Stock Units | 2,168 | $0.00 | - | |
| Mark A. McCollum - Director | Option exercise | Common Stock | 2,168 | - | - | |
| Mark A. McCollum - Director | Option exercise | Restricted Stock Units | 2,168 | $0.00 | - | |
| Kimberly S. Lubel - Director | Option exercise | Common Stock | 2,168 | - | - | |
| Kimberly S. Lubel - Director | Option exercise | Restricted Stock Units | 2,168 | $0.00 | - | |
| Michael J. Graff - Director | Option exercise | Common Stock | 2,168 | - | - | |
| Michael J. Graff - Director | Option exercise | Restricted Stock Units | 2,168 | $0.00 | - | |
| Roger A. Cregg - Director | Option exercise | Common Stock | 2,168 | - | - | |
| Roger A. Cregg - Director | Option exercise | Restricted Stock Units | 2,168 | $0.00 | - | |
| David Tsung-Hung Chao - Director | Option exercise | Common Stock | 2,168 | - | - | |
| David Tsung-Hung Chao - Director | Option exercise | Restricted Stock Units | 2,168 | $0.00 | - | |
| Catherine T. Chao - Director | Option exercise | Common Stock | 2,168 | - | - | |
| 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 | - | |
| Mark Steven Bender - Officer | Tax withholding / forfeiture | Common Stock | 5,284 | $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 | $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 | $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 | $0.00 | - | |
| Scott Thomas Szwejbka - Officer | Tax withholding / forfeiture | Common Stock | 91 | $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 | - | |
 Jeffrey Adam Holy - Officer | Grant or award | Common Stock | 264 | $0.00 | - | |
| Jeffrey Adam Holy - Officer | Tax withholding / forfeiture | Common Stock | 81 | $94.10 | $8K | |
| Jeffrey Adam Holy - Officer | Grant or award | Employee Option (right to buy) | 4,394 | $0.00 | - | |
| Jeffrey Adam Holy - Officer | Grant or award | Restricted Stock Units | 1,199 | $0.00 | - | |
| Jeffrey Adam Holy - Officer | Grant or award | Restricted Stock Units | 2,540 | $0.00 | - |
A Form 144 is notice of an INTENDED sale, not a completed one. It often precedes the Form 4 that reports the trade actually happening.
| Filed | Filer | Relationship | Shares | Market value | Notice |
|---|---|---|---|---|---|
| ALBERT Y CHAO | Officer, Director | 38,873 | $3.12M | View on EDGAR |
WESTLAKE CORP (WLK) had 21 insider filings in the last 90 days, with the most recent on 2026-08-17. The full record for WLK runs to 64 Form 4 filings, the earliest from 2024-11-25. InsiderAlpha tracks every Form 4, Form 144, and 8-K filing in real time.
No insider purchases of WLK were filed in the last 90 days. 1 purchase is on record for this company.
2 insider sales of WLK were filed in the last 90 days, totaling $3.12M.
This page tracks WLK Form 4 insider transactions, Form 144 sale notices, and 8-K material event disclosures in one timeline. Annual 10-K and quarterly 10-Q reports live on the company's SEC EDGAR page.
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Every Form 4 below links to the original document on SEC EDGAR, so the numbers on this page can be checked against the filing they came from.
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