18 insiders reported 106 Form 4 transactions for WESTLAKE CORP (WLK) over the past 18 months (most recent 2026-05-14). Recent activity: Bender Mark Steven (EVP & CFO) Sell 5,284 shares, Bender Mark Steven (EVP & CFO) Buy 13,164 shares, Buesinger Robert F. (EVP, PEM Segment Head) Sell 4,000 shares, Bender Mark Steven (EVP & CFO) Sell 16,413 shares, Bender Mark Steven (EVP & CFO) Sell 1,171 shares. Source: SEC Form 4.
| Date | Insider | Title | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-05-14 | Bender Mark Steven | EVP & CFO | Sell | 5,284 | $514,345 |
| 2026-05-14 | Bender Mark Steven | EVP & CFO | Buy | 13,164 | $0 |
| 2026-03-31 | Buesinger Robert F. | EVP, PEM Segment Head | Sell | 4,000 | $461,000 |
| 2026-03-30 | Bender Mark Steven | EVP & CFO | Sell | 16,413 | $1.8M |
| 2026-03-06 | Bender Mark Steven | EVP & CFO | Sell | 1,171 | $122,908 |
| 2026-03-02 | Bender Mark Steven | EVP & CFO | Buy | 6,199 | $407,956 |
| 2026-03-02 | Bender Mark Steven | EVP & CFO | Buy | 6,494 | $561,991 |
| 2026-03-02 | Bender Mark Steven | EVP & CFO | Sell | 12,693 | $1.2M |
| 2026-03-02 | Bender Mark Steven | EVP & CFO | Sell | 16,988 | $1.7M |
| 2026-03-02 | Bender Mark Steven | EVP & CFO | Sell | 421 | $42,740 |
| 2026-02-23 | Chao James | Senior Chairman | Buy | 3,884 | $0 |
| 2026-02-23 | Holy Jeffrey Adam | VP and CAO | Sell | 81 | $7,622 |
| 2026-02-23 | Holy Jeffrey Adam | VP and CAO | Buy | 264 | $0 |
| 2026-02-23 | Chao James | Senior Chairman | Sell | 1,569 | $147,643 |
| 2026-02-23 | Chao Albert | Executive Chairman | Buy | 6,193 | $0 |
| 2026-02-23 | Chao Albert | Executive Chairman | Sell | 2,501 | $235,344 |
| 2026-02-23 | Buesinger Robert F. | EVP, PEM Segment Head | Buy | 1,301 | $0 |
| 2026-02-23 | Buesinger Robert F. | EVP, PEM Segment Head | Sell | 326 | $30,677 |
| 2026-02-23 | Ederington L. Benjamin | EVP, Legal & External Affairs | Buy | 1,425 | $0 |
| 2026-02-23 | Ederington L. Benjamin | EVP, Legal & External Affairs | Sell | 357 | $33,594 |
| 2026-02-23 | Szwejbka Scott Thomas | SVP, HIP Segment Head | Buy | 365 | $0 |
| 2026-02-23 | Szwejbka Scott Thomas | SVP, HIP Segment Head | Sell | 91 | $8,563 |
| 2026-02-23 | Chao John Tsung-chen | Director | Buy | 213 | $0 |
| 2026-02-23 | Chao John Tsung-chen | Director | Sell | 91 | $8,563 |
| 2026-02-23 | Bender Mark Steven | EVP & CFO | Buy | 1,777 | $0 |
Source: SEC Form 4 filings · as of 2026-05-14