Form 4 for WLK WESTLAKE CORP
Accepted 2026-02-23 00:00:00 ET · period of report 2026-02-19 · accession 0001193125-26-063688 · SEC index · Original document
Summary rows
Aggregated the way they appear in lists: one row per insider, transaction code and security table.
| X | Filed | Traded | Ticker | Insider | Title | Type | Price | Qty | Owned | ΔOwn | Value |
|---|---|---|---|---|---|---|---|---|---|---|---|
| D | 2026-02-23 | 2026-02-19 | WLK | Buesinger Robert F. | EVP, PEM Segment Head | A - Grant | $0.00 | +1,301 | 38.8K | +3% | $0 |
| D | 2026-02-23 | 2026-02-20 | WLK | Buesinger Robert F. | EVP, PEM Segment Head | F - Tax | $94.10 | -326 | 38.5K | -0.8% | -$30.7K |
| DM | 2026-02-23 | 2026-02-20 | WLK | Buesinger Robert F. | EVP, PEM Segment Head | A - Grant | $0.00 | +24.6K | 19.4K | New | $0 |
Purchase Sale Sale after option exercise All abbreviations
Every reported transaction
| # | Table | Security | Date | Code | A/D | Shares | Price | Owned after | Own | Exercise / expiry | Underlying | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Common | Common Stock | 2026-02-19 | A | A | 1,301 | $0.00 | 38,808 | D | — | — | (F1) Represents shares of common stock that vested on February 19, 2026, upon the determination by the Compensation Committee of the Issuer's Board of Directors of the satisfaction of performance criteria underlying an award of performance stock units ("PSUs") granted to the Reporting Person on February 17, 2023, under the terms of the Issuer's 2013 Omnibus Incentive Plan. |
| 2 | Common | Common Stock | 2026-02-20 | F | D | 326 | $94.10 | 38,482 | D | — | — | (F2) Shares otherwise issuable were witheld to satisfy tax obligations arising out of vesting of the Reporting Person's PSUs. (F3) Weighted average price. These shares were sold in multiple transactions at prices ranging from $94.10 to $94.29, inclusive. The Reporting Person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the SEC, upon request, full information regarding the number of shares sold at each separate price within the range set forth above. |
| 3 | Derivative | Restricted Stock Units | 2026-02-20 | A | A | 5,281 | $0.00 | 5,281 | D | — · — to — | 5,281 Common Stock | (F5) Each restricted stock unit ("RSU") represents a contingent right to recieve one share of the Issuer's common stock. (F6) All of the RSUs will vest on February 20, 2029. |
| 4 | Derivative | Employee Option (right to buy) | 2026-02-20 | A | A | 19,351 | $0.00 | 19,351 | D | $94.48 · — to 2036-02-20 | 19,351 Common Stock | (F4) The stock options are excercisable in three installments of 33%, 33% and 34% on February 20, 2027, 2028 and 2029, respectively. |