Form 4 for WLK WESTLAKE CORP
Accepted 2026-02-19 00:00:00 ET · period of report 2026-02-17 · accession 0001193125-26-059210 · 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 | 2026-02-19 | 2026-02-17 | WLK | Buesinger Robert F. | EVP, PEM Segment Head | M - OptEx | $0.00 | +3,478 | 38.4K | +10% | $0 |
| D | 2026-02-19 | 2026-02-18 | WLK | Buesinger Robert F. | EVP, PEM Segment Head | F - Tax | $98.95 | -903 | 37.5K | -2% | -$89.4K |
| D | 2026-02-19 | 2026-02-17 | WLK | Buesinger Robert F. | EVP, PEM Segment Head | M - OptEx | $0.00 | -3,478 | 0 | -100% | $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 | 2026-02-17 | M | A | 3,478 | $0.00 | 38,410 | D | — | — | (F1) Restricted stock units ("RSUs") convert into the Issuer's common stock on a one-for-one basis. |
| 2 | Common | Common Stock | 2026-02-18 | F | D | 903 | $98.95 | 37,507 | D | — | — | (F3) Shares otherwise issuable were withheld to satisfy tax obligations arising out of the vesting of the reporting persons RSUs. |
| 3 | Derivative | Restricted Stock Units | 2026-02-17 | M | D | 3,478 | $0.00 | 0 | D | — · — to — | 3,478 Common Stock | (F1) Restricted stock units ("RSUs") convert into the Issuer's common stock on a one-for-one basis. (F2) On February 17, 2023, the reporting person was granted 3,478 RSUs vesting on the third anniversay of the grant date. |