SEC Form 4 · accession 0001193125-26-345140
WESTLAKE CORP · WLK
Statement of changes in beneficial ownership, as filed. Original on EDGAR ↗
Reporting owner
Albert Chao
Officer — Executive Chairman · Director
Period of report
Aug 11, 2026
Accepted (ET)
Aug 11, 2026 · 5:45 pm EDT
Rule 10b5-1 plan
box not checked
Issuer CIK
0001262823
Table I — non-derivative securities
| Security | Date | Code | Shares | Price | A/D | Owned after | D/I | Nature of ownership |
|---|---|---|---|---|---|---|---|---|
| Common Stock | Aug 11, 2026 | M | 38,873 | $61.865 | A | 681,753 | D | |
| Common StockF1 | Aug 11, 2026 | S | 7,489 | $79.70 | D | 674,264 | D | |
| Common StockF2 | Aug 11, 2026 | S | 31,384 | $80.42 | D | 642,880 | D |
Table II — derivative securities
| Security | Conv. / exercise price | Date | Code | Shares | A/D | Exercisable | Expires | Underlying | Underlying shares | Owned after | D/I |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Employee Option (right to buy)F3 | $61.865 | Aug 11, 2026 | M | 38,873 | D | — | Feb 17, 2027 | Common Stock | 38,873 | 38,873 | D |
Explanation of responses
- F1Weighted average price. These shares were sold in multiple transactions ranging from $79.02 to $80.01 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.
- F2Weighted average price. These shares were sold in multiple transactions ranging from $80.10 to $80.86 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.
- F3The stock options are exercisable in three installments of 33%, 33% and 34% on February 17, 2018, 2019 and 2020, respectively.