Westlake Corporation (WLK) ownership: Top institutional holder: Orbis Allan Gray Ltd ($618.39M). Insider activity: Net Seller (1 buys, 19 sells). 3 recent congressional STOCK Act disclosures. SEC EDGAR first-party data.
| Holder | Shares | Market Value | Reported |
|---|---|---|---|
| Orbis Allan Gray Ltd | 5293519.00 | $618.39M | 2026-03-31 |
| Capital World Investors | 4211006.00 | $491.93M | 2026-03-31 |
| BlackRock, Inc. | 3079087.00 | $359.70M | 2026-03-31 |
| VANGUARD GROUP INC | 3917329.00 | $289.65M | 2025-12-31 |
| BRANDES INVESTMENT PARTNERS, LP | 1842650.00 | $215.26M | 2026-03-31 |
| WELLINGTON MANAGEMENT GROUP LLP | 1793517.00 | $209.52M | 2026-03-31 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 1769808.00 | $206.75M | 2026-03-31 |
| DIMENSIONAL FUND ADVISORS LP | 1466020.00 | $171.26M | 2026-03-31 |
| Insider | Transaction | Value | Date |
|---|---|---|---|
| Buy | null | 2026-05-13 | |
| Sell | null | 2026-05-12 | |
| Sell | null | 2026-05-12 | |
| Sell | null | 2026-05-12 | |
| Sell | null | 2026-05-12 | |
| Sell | null | 2026-05-12 | |
| Sell | null | 2026-04-02 | |
| Sell | null | 2026-04-02 |
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Institutional data from SEC Form 13F. Insider data from SEC Form 4. Congressional data from STOCK Act disclosures. Not personalized investment advice.