Form 4 for WLK WESTLAKE CORP
Accepted 2025-12-23 00:00:00 ET · period of report 2025-12-22 · accession 0001193125-25-329926 · 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 | 2025-12-23 | 2025-12-22 | WLK | Chao Albert | Executive COB, Dir | S - Sale+OE | $73.58 | -40.8K | 628.2K | -6% | -$3.00M |
| D | 2025-12-23 | 2025-12-22 | WLK | Chao Albert | Executive COB, Dir | M - OptEx | $44.42 | +81.7K | 668.6K | +14% | +$3.63M |
| D | 2025-12-23 | 2025-12-22 | WLK | Chao Albert | Executive COB, Dir | M - OptEx | $0.00 | -81.7K | 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 | 2025-12-22 | S | D | 521 | $74.44 | 627,722 | D | — | — | (F4) Weighted average price. These shares were sold in multiple transactions ranging from $74.405 to $74.515 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. |
| 2 | Common | Common Stock | 2025-12-22 | S | D | 9,711 | $72.82 | 658,847 | D | — | — | (F2) Weighted average price. These shares were sold in multiple transactions ranging from $72.395 to $73.39 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 | Common | Common Stock | 2025-12-22 | M | A | 81,673 | $44.42 | 668,558 | D | — | — | |
| 4 | Common | Common Stock | 2025-12-22 | S | D | 30,604 | $73.80 | 628,243 | D | — | — | (F3) Weighted average price. These shares were sold in multiple transactions ranging from $73.40 to $74.40 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. |
| 5 | Derivative | Employee Option (right to buy) | 2025-12-22 | M | D | 81,673 | $0.00 | 0 | D | $44.42 · — to 2026-02-18 | 81,673 Common Stock | (F5) The stock options are exercisable in three installments of 33%, 33% and 34% on February 18, 2017, 2018 and 2019, respectively. |