| Due Diligence for Asset Managers |
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| Westlake Chemical Corp | |
|---|---|
| Ticker | WLK |
| CIK # | 0001262823 |
| CUSIP | 960413102 |
| Sector | Life Sciences - Industrial Organic Chemicals |
| Address | , Houston, TX |
| Source | [EDGAR] |
| CIK | Filing | 2011 - 2026 |
|---|---|---|
| [0001262823] | 10-K | |
| [0001262823] | 10-Q | |
| [0001262823] | 3 | |
| [0001262823] | 4 | |
| [0001262823] | 8-K | |
| [0001262823] | SC 13G |
| Form 13D/13G Filer | Form 13D/13G Subject | Filed | % Owned |
|---|---|---|---|
| FMR LLC | Westlake Chemical Corp | [2019-02-13] | 0.0 |
| Insider Transaction (Form 3/4/5) | Date | Action | Shares | Price | Value ($) |
|---|---|---|---|---|---|
|
Buesinger Robert F
Common Stock
|
2026-03-27 | Sell | 4,000 | $115.25 | 461,000 |
|
Bender Mark Steven
Common Stock
|
2026-03-27 | Sell | 16,413 | $112.54 | 1,847,119 |
|
Bender Mark Steven
Common Stock
|
2026-02-27 | Sell | 421 | $101.52 | 42,740 |
|
Bender Mark Steven
Common Stock
|
2026-02-27 | Option exercise | 6,494 | $86.54 | 561,991 |
|
Bender Mark Steven
Employee Option (right to buy) · derivative
|
2026-02-27 | Option exercise | 6,199 | $0.00 | |
|
Bender Mark Steven
Common Stock
|
2026-02-27 | Disposed to issuer | 12,693 | $98.20 | 1,246,453 |
|
Bender Mark Steven
Employee Option (right to buy) · derivative
|
2026-02-27 | Option exercise | 6,494 | $0.00 | |
|
Bender Mark Steven
Common Stock
|
2026-02-27 | Option exercise | 6,199 | $65.81 | 407,956 |
|
Bender Mark Steven
Common Stock
|
2026-02-27 | Sell | 16,988 | $100.91 | 1,714,259 |
|
Bender Mark Steven
Restricted Stock Units · derivative
|
2026-02-20 | Grant | 7,747 | $0.00 | |
|
Bender Mark Steven
Common Stock
|
2026-02-20 | Tax withheld | 445 | $94.10 | 41,874 |
|
Chao James
Employee Option (right to buy) · derivative
|
2026-02-20 | Grant | 27,382 | $0.00 | |
|
Gilson Jean-Marc
Employee Option (right to buy) · derivative
|
2026-02-20 | Grant | 109,139 | $0.00 | |
|
Gilson Jean-Marc
Restricted Stock Units · derivative
|
2026-02-20 | Grant | 29,784 | $0.00 | |
|
Ederington L Benjamin
Common Stock
|
2026-02-20 | Tax withheld | 357 | $94.10 | 33,594 |
|
Bender Mark Steven
Employee Option (right to buy) · derivative
|
2026-02-20 | Grant | 28,389 | $0.00 | |
|
Patel Bhavesh V
Restricted Stock Units · derivative
|
2026-02-20 | Grant | 1,852 | $0.00 | |
|
Chao James
Common Stock
|
2026-02-20 | Tax withheld | 1,569 | $94.10 | 147,643 |
|
Holy Jeffrey Adam
Common Stock
|
2026-02-20 | Tax withheld | 81 | $94.10 | 7,622 |
|
Buesinger Robert F
Common Stock
|
2026-02-20 | Tax withheld | 326 | $94.10 | 30,677 |
| showing 20 of 200 most recent transactions | |||||
| 13F Ownership Over Time | Holders | Shares Held |
|---|---|---|
| 2026-03-31 | 336 | 41,873,183 |
| 2025-12-31 | 300 | 44,500,175 |
| 2025-09-30 | 305 | 39,759,780 |
| 2025-06-30 | 309 | 38,131,704 |
| 2025-03-31 | 362 | 36,388,961 |
| 2024-12-31 | 378 | 35,268,105 |
| 2024-09-30 | 405 | 34,185,208 |
| 2024-06-30 | 382 | 34,175,961 |
| 2024-03-31 | 348 | 35,947,437 |
| 2023-12-31 | 357 | 36,133,808 |
| 2023-09-30 | 335 | 37,062,906 |
| 2023-06-30 | 343 | 36,924,546 |