| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| Bender Mark Steven | EVP & CFO | 2801 POST OAK BLVD., STE. 600, HOUSTON | M. Steven Bender by J. Feng, POA | 06 Mar 2026 | 0001330417 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | WLK | Common Stock | Tax liability | -1,171 | -4.4% | $104.96* | 25,608 | 16 Feb 2022 | Direct | F1 |
| Id | Content |
|---|---|
| F1 | The original Form 4 filed by the Reporting Person on February 17, 2022, is amended by this Form 4/A to disclose that 1,171 shares of common stock were sold to cover tax withholding obligations arising from the vesting of the Reporting Person's restricted stock units. The original Form 4 reported an incorrect number of shares sold to cover tax withholding obligations. [This Form 4/A is in addition to, and does not replace, the disclosure contained in the original Form 4.] |