Form 4 for WLK WESTLAKE CORP
Accepted 2026-03-02 00:00:00 ET · period of report 2026-02-27 · accession 0001193125-26-084672 · 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| DM | 2026-03-02 | 2026-02-27 | WLK | Bender Mark Steven | EVP, CFO | M - OptEx | $76.42 | +12.7K | 74.5K | +21% | +$969.9K |
| DM | 2026-03-02 | 2026-02-27 | WLK | Bender Mark Steven | EVP, CFO | S - Sale+OE | $100.92 | -17.4K | 44.9K | -28% | -$1.76M |
| D | 2026-03-02 | 2026-02-27 | WLK | Bender Mark Steven | EVP, CFO | D - Sale to Iss | $98.20 | -12.7K | 61.8K | -17% | -$1.25M |
| DM | 2026-03-02 | 2026-02-27 | WLK | Bender Mark Steven | EVP, CFO | M - OptEx | $0.00 | -12.7K | 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 | 2026-02-27 | M | A | 6,199 | $65.81 | 68,041 | D | — | — | |
| 2 | Common | Common Stock | 2026-02-27 | S | D | 421 | $101.52 | 44,433 | D | — | — | |
| 3 | Common | Common Stock | 2026-02-27 | S | D | 16,988 | $100.91 | 44,854 | D | — | — | (F1) Weighted average price. These shares were sold in multiple transactions at prices ranging from $100.38 to $101.36 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. |
| 4 | Common | Common Stock | 2026-02-27 | D | D | 12,693 | $98.20 | 61,842 | D | — | — | |
| 5 | Common | Common Stock | 2026-02-27 | M | A | 6,494 | $86.54 | 74,535 | D | — | — | |
| 6 | Derivative | Employee Option (right to buy) | 2026-02-27 | M | D | 6,494 | $0.00 | 0 | D | $86.54 · — to 2031-02-19 | 6,494 Common Stock | (F3) The stock options are exercisable in three installments of 33%, 33% and 34% on February 19, 2022, 2023 and 2024, respectively. |
| 7 | Derivative | Employee Option (right to buy) | 2026-02-27 | M | D | 6,199 | $0.00 | 0 | D | $65.81 · — to 2030-02-14 | 6,199 Common Stock | (F2) The stock options are exercisable in three installments of 33%. 33% and 34% on February 14, 2021, 2022 and 2023, respectively. |