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 3 of 3.
| Date | Insider | Transaction | Security | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Robert F. Buesinger - Officer | Grant or award | Restricted Stock Units | 17,101 | $0.00 | - | |
 Roger A. Cregg | Grant or award | Restricted Stock Units | 1,339 | $0.00 | - | |
 David Tsung-Hung Chao | Open-market sale | Common Stock | 1,750 | $129.08 | $226K | |
| David Tsung-Hung Chao | Open-market sale | Common Stock | 1,750 | $130.00 | $228K |
This is as far as the anonymous view goes. Create a free account for all 64 WLK filings on record.
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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