Westlake Chemical Corporation
Ownership
Ownership Structure
Who owns Westlake Chemical Corporation (WLK)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 26.0% of the shares are freely tradable; institutional investors hold 35.2%.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| BlackRock Inc | 2.58 | 3,294,162 | +7.0 | 06/30/2026 |
| Capital World Investors | 2.22 | 2,842,348 | -32.5 | 06/30/2026 |
| T. Rowe Price Associates, Inc. | 1.73 | 2,206,676 | -8.3 | 06/30/2026 |
| Orbis Allan Gray Ltd | 1.63 | 2,084,364 | -60.6 | 06/30/2026 |
| Dimensional Fund Advisors, Inc. | 1.61 | 2,051,554 | +39.9 | 06/30/2026 |
| Vanguard Portfolio Management, LLC | 1.37 | 1,752,627 | -1.0 | 06/30/2026 |
| Brandes Investment Partners & Co | 1.23 | 1,572,939 | -14.6 | 06/30/2026 |
| AQR Capital Management LLC | 1.23 | 1,570,453 | +503.9 | 06/30/2026 |
| Vanguard Capital Management, LLC | 1.15 | 1,464,223 | +0.6 | 06/30/2026 |
| State Street Corp | 1.14 | 1,453,407 | +5.3 | 06/30/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Insider holdings
| Person | Role | Shares | Value | As of | Type |
|---|---|---|---|---|---|
| Chao Albert | Executive Chairman | 642,880 | 43,908,704 $ | Aug 11, 2026 | direct |
| Northcutt R Bruce | Director | 23,351 | 1,594,873 $ | Aug 8, 2026 | direct |
| Graff Michael J | Director | 23,310 | 1,592,073 $ | Aug 8, 2026 | direct |
| Sheets Jeffrey Wayne | Director | 14,927 | 1,019,514 $ | Aug 8, 2026 | direct |
| Lubel Kimberly S | Director | 13,821 | 943,974 $ | Aug 8, 2026 | direct |
| Mccollum Mark A | Director | 11,824 | 807,579 $ | Aug 8, 2026 | direct |
| Chao David Tsung-Hung | Director | 11,080 | 756,764 $ | Aug 8, 2026 | direct |
| Chao Catherine T. | Director | 7,748 | 529,188 $ | Aug 8, 2026 | direct |
| Sabat Carolyn Chao | Director | 5,748 | 392,588 $ | Aug 8, 2026 | direct |
| Cregg Roger A | Director | 3,507 | 239,528 $ | Aug 8, 2026 | direct |
Holdings as of each person's most recent SEC Form 4 filing — excluding options and RSUs, which are not shares yet. Holdings may have changed between two filings.
Insiders
Insider Transactions
| Date | Person | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Aug 11, 2026 | Chao Albert | Executive Chairman | Sell | 31,384 | 80.42 | 2,523,901 |
| Aug 11, 2026 | Chao Albert | Executive Chairman | Sell | 7,489 | 79.70 | 596,873 |
| Aug 11, 2026 | Chao Albert | Executive Chairman | Other | 38,873 | 61.87 | 2,404,878 |
| Aug 8, 2026 | Sheets Jeffrey Wayne | Director | Other | 2,168 | – | – |
| Aug 8, 2026 | Sabat Carolyn Chao | Director | Other | 2,168 | – | – |
| Aug 8, 2026 | Northcutt R Bruce | Director | Other | 2,168 | – | – |
| Aug 8, 2026 | Mccollum Mark A | Director | Other | 2,168 | – | – |
| Aug 8, 2026 | Lubel Kimberly S | Director | Other | 2,168 | – | – |
| Aug 8, 2026 | Graff Michael J | Director | Other | 2,168 | – | – |
| Aug 8, 2026 | Cregg Roger A | Director | Other | 2,168 | – | – |
| Aug 8, 2026 | Chao David Tsung-Hung | Director | Other | 2,168 | – | – |
| Aug 8, 2026 | Chao Catherine T. | Director | Other | 2,168 | – | – |
Reportable transactions by officers and major shareholders from SEC Form 4 filings. "Other" includes things like stock grants and option exercises without a buy/sell character. View all insider transactions →
Data as of: October 30, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.