SEC Form 4 · Updated Daily
WLK
— WESTLAKE CORPORATION OwnershipInsider and institutional ownership derived from SEC Form 4 filings. Click any owner to see their holdings across every company they’ve filed on, and how their position has changed over time.
Current Reporting Owners
| Owner | Role | Shares Owned | As Of | Last Activity |
|---|---|---|---|---|
| TTWF LP | 10%+ Owner | 46,005,277 | 2006-05-02 | S |
| TTWFGP LLC | 10%+ Owner | 1,395,000 | 2020-03-27 | P |
| Chao Albert | Director · Officer | 681,753 | 2026-08-11 | M |
| Ederington L. Benjamin | Officer | 80,515 | 2026-02-19 | A |
| Jenkins Dorothy C | 10%+ Owner · Director | 73,778 | 2022-08-13 | M |
| Chao James | Director · Officer | 51,343 | 2026-02-19 | A |
| Kearns Roger L. | Officer | 45,785 | 2023-02-17 | A |
| Bender Mark Steven | Officer | 41,179 | 2026-05-12 | M |
| Teel Lawrence E. | Officer | 38,352 | 2021-02-25 | M |
| Wallace Stephen | Officer | 37,949 | 2013-08-01 | M |
| Buesinger Robert F. | Officer | 34,482 | 2026-03-27 | S |
| Taylor Jeffrey L | Officer | 28,349 | 2015-05-26 | M |
| Morse Wayne D | Officer | 26,009 | 2010-03-03 | A |
| Hansen David R | Officer | 25,807 | 2015-02-18 | F |
| Condon Donald Marion Jr | Director | 25,343 | 2013-03-13 | M |
| Wilder Warren W | Officer | 24,158 | 2008-03-17 | F |
| NORTHCUTT R BRUCE | Director | 23,351 | 2026-08-08 | M |
| Graff Michael J | Director | 23,310 | 2026-08-08 | M |
| RILEY H JOHN JR | Director | 22,652 | 2019-03-19 | S |
| Kenner Andrew | Officer | 20,362 | 2022-02-18 | A |
| BARNETT E WILLIAM | Director | 20,311 | 2012-11-30 | M |
| Janssens Thomas J. | Officer | 17,733 | 2025-02-20 | A |
| Bates Simon | Director | 15,079 | 2016-09-09 | F |
| Sheets Jeffrey Wayne | Director | 14,927 | 2026-08-08 | M |
| Szwejbka Scott Thomas | Officer | 13,864 | 2026-02-19 | A |
| Lubel Kimberly S | Director | 13,821 | 2026-08-08 | M |
| MCCOLLUM MARK A | Director | 11,824 | 2026-08-08 | M |
| Haas Marius | Director | 11,631 | 2024-08-11 | M |
| Chao David Tsung-Hung | Director | 11,080 | 2026-08-08 | M |
| BLAKELY ROBERT T | Director | 10,989 | 2018-08-21 | M |
| LUKENS MAX L | Director | 9,122 | 2019-08-17 | M |
| Chao John Tsung-chen | Director | 7,979 | 2026-02-19 | A |
| Chao Catherine T. | Director | 7,748 | 2026-08-08 | M |
| Mattina Michael J. | Officer | 6,723 | 2017-02-14 | M |
| Sabat Carolyn Chao | Director | 5,748 | 2026-08-08 | M |
| Holy Jeffrey Adam | Officer | 5,205 | 2026-02-19 | A |
| Zoeller Johnathan Stevan | Officer | 5,073 | 2024-03-21 | M |
| Mangieri George J | Officer | 5,045 | 2020-02-17 | M |
| CREGG ROGER A | Director | 3,507 | 2026-08-08 | M |
| Whitaker Gilbert R Jr | Director | 1,612 | 2006-08-21 | A |
| GIBBONS JOHN D | Officer | 1,548 | 2006-05-15 | A |
Recent Filings
| Date | Owner | Activity | Shares | Price | Owned After |
|---|---|---|---|---|---|
| 2026-08-31 | Darby Tommy | Grant / award (derivative) | 1,791 | $0.00 | 1,791 |
| 2026-08-14 | Chao Catherine T. | Grant / award (derivative) | 2,184 | $0.00 | 2,184 |
| 2026-08-14 | Chao David Tsung-Hung | Grant / award (derivative) | 2,184 | $0.00 | 2,184 |
| 2026-08-14 | CREGG ROGER A | Grant / award (derivative) | 2,184 | $0.00 | 2,184 |
| 2026-08-14 | Graff Michael J | Grant / award (derivative) | 2,184 | $0.00 | 2,184 |
| 2026-08-14 | Lubel Kimberly S | Grant / award (derivative) | 2,184 | $0.00 | 2,184 |
| 2026-08-14 | MCCOLLUM MARK A | Grant / award (derivative) | 2,184 | $0.00 | 2,184 |
| 2026-08-14 | NORTHCUTT R BRUCE | Grant / award (derivative) | 2,184 | $0.00 | 2,184 |
| 2026-08-14 | Patel Bhavesh V. | Grant / award (derivative) | 2,184 | $0.00 | 2,184 |
| 2026-08-14 | Sabat Carolyn Chao | Grant / award (derivative) | 2,184 | $0.00 | 2,184 |
| 2026-08-14 | Sheets Jeffrey Wayne | Grant / award (derivative) | 2,184 | $0.00 | 2,184 |
| 2026-08-11 | Chao Albert | Option exercise (derivative) | 38,873 | $0.00 | 38,873 |
| 2026-08-11 | Chao Albert | Open-market sale | 31,384 | $80.42 | 642,880 |
| 2026-08-11 | Chao Albert | Open-market sale | 7,489 | $79.70 | 674,264 |
| 2026-08-11 | Chao Albert | Option exercise | 38,873 | $61.87 | 681,753 |
| 2026-08-08 | Chao Catherine T. | Option exercise (derivative) | 2,168 | $0.00 | 2,168 |
| 2026-08-08 | Chao Catherine T. | Option exercise | 2,168 | — | 7,748 |
| 2026-08-08 | Chao David Tsung-Hung | Option exercise (derivative) | 2,168 | $0.00 | 2,168 |
| 2026-08-08 | Chao David Tsung-Hung | Option exercise | 2,168 | — | 11,080 |
| 2026-08-08 | CREGG ROGER A | Option exercise (derivative) | 2,168 | $0.00 | 2,168 |
| 2026-08-08 | CREGG ROGER A | Option exercise | 2,168 | — | 3,507 |
| 2026-08-08 | Graff Michael J | Option exercise (derivative) | 2,168 | $0.00 | 2,168 |
| 2026-08-08 | Graff Michael J | Option exercise | 2,168 | — | 23,310 |
| 2026-08-08 | Lubel Kimberly S | Option exercise (derivative) | 2,168 | $0.00 | 2,168 |
| 2026-08-08 | Lubel Kimberly S | Option exercise | 2,168 | — | 13,821 |
| 2026-08-08 | MCCOLLUM MARK A | Option exercise (derivative) | 2,168 | $0.00 | 2,168 |
| 2026-08-08 | MCCOLLUM MARK A | Option exercise | 2,168 | — | 11,824 |
| 2026-08-08 | NORTHCUTT R BRUCE | Option exercise (derivative) | 2,168 | $0.00 | 2,168 |
| 2026-08-08 | NORTHCUTT R BRUCE | Option exercise | 2,168 | — | 23,351 |
| 2026-08-08 | Sabat Carolyn Chao | Option exercise (derivative) | 2,168 | $0.00 | 2,168 |
| 2026-08-08 | Sabat Carolyn Chao | Option exercise | 2,168 | — | 5,748 |
| 2026-08-08 | Sheets Jeffrey Wayne | Option exercise (derivative) | 2,168 | $0.00 | 2,168 |
| 2026-08-08 | Sheets Jeffrey Wayne | Option exercise | 2,168 | — | 14,927 |
| 2026-06-15 | Baksht Jonathan | Grant / award (derivative) | 20,580 | $0.00 | 20,580 |
| 2026-05-13 | Bender Mark Steven | Tax withholding | 5,284 | $97.34 | 35,895 |
| 2026-05-12 | Bender Mark Steven | Option exercise (derivative) | 13,164 | $0.00 | 0 |
| 2026-05-12 | Bender Mark Steven | Option exercise | 13,164 | $0.00 | 41,179 |
| 2026-04-02 | Powers Brian John | Grant / award (derivative) | 1,961 | $0.00 | 1,961 |
| 2026-03-27 | Bender Mark Steven | Open-market sale | 16,413 | $112.53 | 28,015 |
| 2026-03-27 | Buesinger Robert F. | Open-market sale | 4,000 | $115.25 | 34,482 |
Source: SEC EDGAR Form 4 filings. For informational purposes only — not investment advice.