WESTLAKE CORP — Insider Transactions
Form 4 filings by directors, officers, and 10%+ shareholders
SEC rules require corporate insiders — including directors, executive officers, and any shareholder owning more than 10% of a company's shares — to report changes in their ownership within two business days of a transaction. These disclosures are filed as Form 4. Open-market purchases (code P) are generally considered the most meaningful signal, as insiders are spending their own money.
| Insider | Title | Type | Shares | Price | Value | Owns After | Date |
|---|---|---|---|---|---|---|---|
| Chao Albert | Executive Chairman | Sale | 30,604 | $73.80 | $2,258,575 | 628,243 | Dec 22, 2025 |
| CREGG ROGER A | — | Option Exercise | 1,339 | — | — | 1,339 | Dec 10, 2025 |
| Szwejbka Scott Thomas | SVP, HIP Segment Head | Option Exercise | 10,840 | — | — | 16,659 | Oct 2, 2025 |
| Chao James | Senior Chairman | Gift | 15,140 | — | — | 39,741 | Aug 28, 2025 |
| Graff Michael J | — | Option Exercise | 1,128 | — | — | 21,142 | Aug 9, 2025 |
| Chao Catherine T. | — | Option Exercise | 1,128 | — | — | 5,580 | Aug 9, 2025 |
| Chao David Tsung-Hung | — | Option Exercise | 1,128 | — | — | 8,912 | Aug 9, 2025 |
| NORTHCUTT R BRUCE | — | Option Exercise | 1,128 | — | — | 21,183 | Aug 9, 2025 |
| Sabat Carolyn Chao | — | Option Exercise | 1,128 | — | — | 3,580 | Aug 9, 2025 |
| MCCOLLUM MARK A | — | Option Exercise | 1,128 | — | — | 9,656 | Aug 9, 2025 |
| Lubel Kimberly S | — | Option Exercise | 1,128 | — | — | 11,653 | Aug 9, 2025 |
| Sheets Jeffrey Wayne | — | Option Exercise | 1,128 | — | — | 12,759 | Aug 9, 2025 |
| Buesinger Robert F. | EVP, PEM Segment Head | Sale | 83 | $72.70 | $6,034 | — | Apr 22, 2025 |
| Chao John Tsung-chen | — | Award / Grant | 955 | — | — | 7,664 | Mar 5, 2025 |
| Janssens Thomas J. | SVP, Ops - PEM & Corp Logistic | Award / Grant | 2,444 | — | — | 17,733 | Feb 21, 2025 |
| Chao John Tsung-chen | — | Award / Grant | 955 | — | — | 7,664 | Feb 20, 2025 |
| Holy Jeffrey Adam | VP and CAO | Tax Withholding | 341 | $110.54 | $37,694 | 4,448 | Feb 20, 2025 |
| Ederington L. Benjamin | EVP, PEM, GC and CAO | Tax Withholding | 2,924 | $110.54 | $323,219 | 76,259 | Feb 20, 2025 |
| Chao James | Senior Chairman | Tax Withholding | 6,554 | $110.54 | $724,479 | 54,881 | Feb 20, 2025 |
| Chao Albert | Executive Chairman | Tax Withholding | 13,390 | $110.54 | $1,480,131 | 586,885 | Feb 20, 2025 |
| Buesinger Robert F. | EVP, HIP, IT & Digital | Tax Withholding | 2,738 | $110.54 | $302,659 | 34,932 | Feb 20, 2025 |
| Bender Mark Steven | EVP & CFO | Tax Withholding | 3,530 | $110.54 | $390,206 | 56,968 | Feb 20, 2025 |
| Buesinger Robert F. | EVP, HIP, IT & Digital | Option Exercise | 12,923 | — | — | 34,846 | Feb 19, 2025 |
| Bender Mark Steven | EVP & CFO | Option Exercise | 13,987 | — | — | 56,125 | Feb 19, 2025 |
| Chao John Tsung-chen | — | Tax Withholding | 235 | $108.62 | $25,526 | 7,429 | Feb 18, 2025 |
| Chao John Tsung-chen | — | Option Exercise | 513 | — | — | 6,709 | Feb 18, 2025 |
| Ederington L. Benjamin | EVP, PEM, GC and CAO | Tax Withholding | 5,052 | $111.46 | $563,096 | 72,094 | Feb 18, 2025 |
| Janssens Thomas J. | SVP, Ops - PEM & Corp Logistic | Tax Withholding | 322 | $111.46 | $35,890 | 15,303 | Feb 18, 2025 |
| Holy Jeffrey Adam | VP and CAO | Tax Withholding | 210 | $111.46 | $23,407 | 3,492 | Feb 18, 2025 |
| Chao James | Senior Chairman | Tax Withholding | 2,193 | $111.46 | $244,432 | 45,154 | Feb 18, 2025 |
| Chao Albert | Executive Chairman | Tax Withholding | 249 | $112.73 | $28,070 | 566,819 | Feb 18, 2025 |
| Janssens Thomas J. | SVP, Ops - PEM & Corp Logistic | Tax Withholding | 790 | $115.29 | $91,079 | 14,312 | Feb 14, 2025 |
| Ederington L. Benjamin | EVP, PEM, GC and CAO | Tax Withholding | 1,895 | $115.29 | $218,475 | 63,972 | Feb 14, 2025 |
| Chao David Tsung-Hung | — | Sale | 1,750 | $129.08 | $225,890 | 7,784 | Nov 29, 2024 |
| Chao David Tsung-Hung | — | Sale | 1,750 | $130.00 | $227,500 | 9,534 | Nov 22, 2024 |
| Chao James | Senior Chairman | Gift | 6,642 | — | — | 38,551 | Aug 30, 2024 |
| Janssens Thomas J. | SVP, Ops - PEM & Corp Logistic | Option Exercise | 6,507 | $65.81 | $428,226 | 22,907 | Aug 23, 2024 |
| Chao Albert | Executive Chairman | Option Exercise | 45,298 | $68.09 | $3,084,341 | 600,214 | Aug 16, 2024 |
| Ederington L. Benjamin | EVP, PEM, GC and CAO | Option Exercise | 2,938 | — | — | 59,426 | Aug 14, 2024 |
| Bender Mark Steven | EVP & CFO | Option Exercise | 2,938 | — | — | 43,294 | Aug 14, 2024 |
| Buesinger Robert F. | EVP, HIP, IT & Digital | Option Exercise | 7,051 | — | — | 24,695 | Aug 14, 2024 |
| Sabat Carolyn Chao | — | Option Exercise | 1,136 | — | — | 2,452 | Aug 11, 2024 |
| Chao Catherine T. | — | Option Exercise | 1,136 | — | — | 4,452 | Aug 11, 2024 |
| Sheets Jeffrey Wayne | — | Option Exercise | 1,136 | — | — | 11,631 | Aug 11, 2024 |
| NORTHCUTT R BRUCE | — | Option Exercise | 1,136 | — | — | 20,055 | Aug 11, 2024 |
| Lubel Kimberly S | — | Option Exercise | 1,136 | — | — | 10,525 | Aug 11, 2024 |
| MCCOLLUM MARK A | — | Option Exercise | 1,136 | — | — | 8,528 | Aug 11, 2024 |
| Haas Marius | — | Option Exercise | 1,136 | — | — | 11,631 | Aug 11, 2024 |
| Graff Michael J | — | Option Exercise | 1,136 | — | — | 20,014 | Aug 11, 2024 |
| Chao David Tsung-Hung | — | Option Exercise | 1,136 | — | — | 11,284 | Aug 11, 2024 |