WLK WESTLAKE CORP
NYSE · SEC CIK 1262823 · EDGAR
- Bought, last 12 months
- $0 0 purchases by 0 insiders
- Sold, last 12 months
- $10.19M 5 sales by 3 insiders
- Filings on record
- 282 since 2021-08-12, latest 2026-09-01 07:14
BoughtSold
Most active insiders, 12 months
| Insider | Title | Bought | Sold |
|---|---|---|---|
| Chao Albert | Executive COB, Dir | — | $6.13M |
| Bender Mark Steven | EVP, CFO | — | $3.60M |
| Buesinger Robert F. | EVP, PEM Segment Head | — | $461.0K |
| Szwejbka Scott Thomas | SVP, HIP Segment Head | — | — |
| Holy Jeffrey Adam | VP, CAO | — | — |
| Chao Catherine T. | Dir | — | — |
| Sabat Carolyn Chao | Dir | — | — |
| Chao John Tsung-chen | Dir | — | — |
| Chao David Tsung-Hung | Dir | — | — |
| Ederington L. Benjamin | EVP, Legal, External Affairs | — | — |
Transactions 348
| X | Filed | Traded | Ticker | Insider | Title | Type | Price | Qty | Owned | ΔOwn | Value |
|---|---|---|---|---|---|---|---|---|---|---|---|
| D | 2026-08-11 17:45 | 2026-08-11 | WLK | Chao Albert | Executive COB, Dir | M - OptEx | $61.87 | +38.9K | 681.8K | +6% | +$2.40M |
| DM | 2026-08-11 17:45 | 2026-08-11 | WLK | Chao Albert | Executive COB, Dir | S - Sale+OE | $80.28 | -38.9K | 642.9K | -6% | -$3.12M |
| D | 2026-08-10 13:54 | 2026-08-08 | WLK | Sheets Jeffrey Wayne | Dir | M - OptEx | — | +2,168 | 14.9K | +17% | — |
| D | 2026-08-10 13:53 | 2026-08-08 | WLK | Sabat Carolyn Chao | Dir | M - OptEx | — | +2,168 | 5,748 | +61% | — |
| D | 2026-08-10 13:53 | 2026-08-08 | WLK | NORTHCUTT R BRUCE | Dir | M - OptEx | — | +2,168 | 23.4K | +10% | — |
| D | 2026-08-10 13:52 | 2026-08-08 | WLK | MCCOLLUM MARK A | Dir | M - OptEx | — | +2,168 | 11.8K | +22% | — |
| D | 2026-08-10 13:52 | 2026-08-08 | WLK | Lubel Kimberly S | Dir | M - OptEx | — | +2,168 | 13.8K | +19% | — |
| D | 2026-08-10 13:51 | 2026-08-08 | WLK | Graff Michael J | Dir | M - OptEx | — | +2,168 | 23.3K | +10% | — |
| D | 2026-08-10 13:51 | 2026-08-08 | WLK | CREGG ROGER A | Dir | M - OptEx | — | +2,168 | 3,507 | +162% | — |
| D | 2026-08-10 13:50 | 2026-08-08 | WLK | Chao David Tsung-Hung | Dir | M - OptEx | — | +2,168 | 11.1K | +24% | — |
| D | 2026-08-10 13:50 | 2026-08-08 | WLK | Chao Catherine T. | Dir | M - OptEx | — | +2,168 | 7,748 | +39% | — |
| D | 2026-05-14 12:33 | 2026-05-12 | WLK | Bender Mark Steven | EVP, CFO | M - OptEx | $0.00 | +13.2K | 41.2K | +47% | $0 |
| D | 2026-05-14 12:33 | 2026-05-13 | WLK | Bender Mark Steven | EVP, CFO | F - Tax | $97.34 | -5,284 | 35.9K | -13% | -$514.3K |
| 2026-03-31 | 2026-03-27 | WLK | Buesinger Robert F. | EVP, PEM Segment Head | S - Sale | $115.25 | -4,000 | 34.5K | -10% | -$461.0K | |
| 2026-03-30 | 2026-03-27 | WLK | Bender Mark Steven | EVP, CFO | S - Sale | $112.54 | -16.4K | 28.0K | -37% | -$1.85M | |
| A | 2026-03-06 | 2022-02-16 | WLK | Bender Mark Steven | EVP, CFO | F - Tax | $104.96 | -1,171 | 25.6K | -4% | -$122.9K |
| DM | 2026-03-02 | 2026-02-27 | WLK | Bender Mark Steven | EVP, CFO | M - OptEx | $76.42 | +12.7K | 74.5K | +21% | +$969.9K |
| DM | 2026-03-02 | 2026-02-27 | WLK | Bender Mark Steven | EVP, CFO | S - Sale+OE | $100.92 | -17.4K | 44.9K | -28% | -$1.76M |
| D | 2026-03-02 | 2026-02-27 | WLK | Bender Mark Steven | EVP, CFO | D - Sale to Iss | $98.20 | -12.7K | 61.8K | -17% | -$1.25M |
| D | 2026-02-23 | 2026-02-20 | WLK | Bender Mark Steven | EVP, CFO | F - Tax | $94.10 | -445 | 61.8K | -0.7% | -$41.9K |
| D | 2026-02-23 | 2026-02-19 | WLK | Bender Mark Steven | EVP, CFO | A - Grant | $0.00 | +1,777 | 62.3K | +3% | $0 |
| D | 2026-02-23 | 2026-02-19 | WLK | Holy Jeffrey Adam | VP, CAO | A - Grant | $0.00 | +264 | 5,205 | +5% | $0 |
| D | 2026-02-23 | 2026-02-20 | WLK | Holy Jeffrey Adam | VP, CAO | F - Tax | $94.10 | -81 | 5,124 | -2% | -$7,622 |
| D | 2026-02-23 | 2026-02-20 | WLK | Chao James | Senior COB, Dir | F - Tax | $94.10 | -1,569 | 49.8K | -3% | -$147.6K |
| D | 2026-02-23 | 2026-02-19 | WLK | Chao James | Senior COB, Dir | A - Grant | $0.00 | +3,884 | 51.3K | +8% | $0 |
| D | 2026-02-23 | 2026-02-20 | WLK | Chao John Tsung-chen | Dir | F - Tax | $94.10 | -91 | 7,888 | -1% | -$8,563 |
| D | 2026-02-23 | 2026-02-19 | WLK | Chao John Tsung-chen | Dir | A - Grant | $0.00 | +213 | 7,979 | +3% | $0 |
| D | 2026-02-23 | 2026-02-20 | WLK | Ederington L. Benjamin | EVP, Legal, External Affairs | F - Tax | $94.10 | -357 | 80.2K | -0.4% | -$33.6K |
| D | 2026-02-23 | 2026-02-19 | WLK | Ederington L. Benjamin | EVP, Legal, External Affairs | A - Grant | $0.00 | +1,425 | 80.5K | +2% | $0 |
| D | 2026-02-23 | 2026-02-20 | WLK | Szwejbka Scott Thomas | SVP, HIP Segment Head | F - Tax | $94.10 | -91 | 13.8K | -0.7% | -$8,563 |
| D | 2026-02-23 | 2026-02-19 | WLK | Szwejbka Scott Thomas | SVP, HIP Segment Head | A - Grant | $0.00 | +365 | 13.9K | +3% | $0 |
| D | 2026-02-23 | 2026-02-19 | WLK | Buesinger Robert F. | EVP, PEM Segment Head | A - Grant | $0.00 | +1,301 | 38.8K | +3% | $0 |
| D | 2026-02-23 | 2026-02-20 | WLK | Buesinger Robert F. | EVP, PEM Segment Head | F - Tax | $94.10 | -326 | 38.5K | -0.8% | -$30.7K |
| D | 2026-02-23 | 2026-02-20 | WLK | Chao Albert | Executive COB, Dir | F - Tax | $94.10 | -2,501 | 642.9K | -0.4% | -$235.3K |
| D | 2026-02-23 | 2026-02-19 | WLK | Chao Albert | Executive COB, Dir | A - Grant | $0.00 | +6,193 | 645.4K | +1.0% | $0 |
| D | 2026-02-19 | 2026-02-17 | WLK | Buesinger Robert F. | EVP, PEM Segment Head | M - OptEx | $0.00 | +3,478 | 38.4K | +10% | $0 |
| D | 2026-02-19 | 2026-02-18 | WLK | Buesinger Robert F. | EVP, PEM Segment Head | F - Tax | $98.95 | -903 | 37.5K | -2% | -$89.4K |
| D | 2026-02-19 | 2026-02-17 | WLK | Chao John Tsung-chen | Dir | M - OptEx | $0.00 | +570 | 7,608 | +8% | $0 |
| D | 2026-02-19 | 2026-02-18 | WLK | Chao John Tsung-chen | Dir | F - Tax | $98.95 | -242 | 7,766 | -3% | -$23.9K |
| D | 2026-02-19 | 2026-02-18 | WLK | Bender Mark Steven | EVP, CFO | F - Tax | $98.95 | -1,209 | 60.5K | -2% | -$119.6K |
| D | 2026-02-19 | 2026-02-17 | WLK | Bender Mark Steven | EVP, CFO | M - OptEx | $0.00 | +4,751 | 61.7K | +8% | $0 |
| D | 2026-02-19 | 2026-02-18 | WLK | Chao James | Senior COB, Dir | F - Tax | $98.95 | -2,664 | 47.5K | -5% | -$263.6K |
| D | 2026-02-19 | 2026-02-17 | WLK | Chao James | Senior COB, Dir | M - OptEx | $0.00 | +10.4K | 50.1K | +26% | $0 |
| D | 2026-02-19 | 2026-02-18 | WLK | Chao Albert | Executive COB, Dir | F - Tax | $98.95 | -5,089 | 639.2K | -0.8% | -$503.6K |
| D | 2026-02-19 | 2026-02-17 | WLK | Chao Albert | Executive COB, Dir | M - OptEx | $0.00 | +16.6K | 644.3K | +3% | $0 |
| D | 2026-02-19 | 2026-02-17 | WLK | Ederington L. Benjamin | EVP, Legal, External Affairs | M - OptEx | $0.00 | +3,809 | 80.1K | +5% | $0 |
| D | 2026-02-19 | 2026-02-18 | WLK | Ederington L. Benjamin | EVP, Legal, External Affairs | F - Tax | $98.95 | -978 | 79.1K | -1% | -$96.8K |
| D | 2026-02-19 | 2026-02-18 | WLK | Holy Jeffrey Adam | VP, CAO | F - Tax | $98.95 | -213 | 4,941 | -4% | -$21.1K |
| D | 2026-02-19 | 2026-02-17 | WLK | Holy Jeffrey Adam | VP, CAO | M - OptEx | $0.00 | +706 | 5,154 | +16% | $0 |
| D | 2026-02-19 | 2026-02-18 | WLK | Szwejbka Scott Thomas | SVP, HIP Segment Head | F - Tax | $98.95 | -295 | 13.5K | -2% | -$29.2K |
| D | 2026-02-19 | 2026-02-17 | WLK | Szwejbka Scott Thomas | SVP, HIP Segment Head | M - OptEx | $0.00 | +977 | 13.8K | +8% | $0 |
| 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 | 2025-12-10 | 2025-12-10 | WLK | CREGG ROGER A | Dir | M - OptEx | — | +1,339 | 1,339 | New | — |
| D | 2025-10-03 | 2025-10-02 | WLK | Szwejbka Scott Thomas | SVP, HIP Segment Head | F - Tax | $76.70 | -3,842 | 12.8K | -23% | -$294.7K |
| D | 2025-10-03 | 2025-10-01 | WLK | Szwejbka Scott Thomas | SVP, HIP Segment Head | M - OptEx | $0.00 | +10.8K | 16.7K | +186% | $0 |
| 2025-08-29 | 2025-08-28 | WLK | Chao James | Senior COB, Dir | G - Gift | $0.00 | -15.1K | 39.7K | -28% | $0 | |
| D | 2025-08-11 | 2025-08-09 | WLK | Chao Catherine T. | Dir | M - OptEx | — | +1,128 | 5,580 | +25% | — |
| D | 2025-08-11 | 2025-08-09 | WLK | Graff Michael J | Dir | M - OptEx | — | +1,128 | 21.1K | +6% | — |
| D | 2025-08-11 | 2025-08-09 | WLK | Sheets Jeffrey Wayne | Dir | M - OptEx | — | +1,128 | 12.8K | +10% | — |
| D | 2025-08-11 | 2025-08-09 | WLK | Chao David Tsung-Hung | Dir | M - OptEx | — | +1,128 | 8,912 | +14% | — |
| D | 2025-08-11 | 2025-08-09 | WLK | Lubel Kimberly S | Dir | M - OptEx | — | +1,128 | 11.7K | +11% | — |
| D | 2025-08-11 | 2025-08-09 | WLK | NORTHCUTT R BRUCE | Dir | M - OptEx | — | +1,128 | 21.2K | +6% | — |
| D | 2025-08-11 | 2025-08-09 | WLK | Sabat Carolyn Chao | Dir | M - OptEx | — | +1,128 | 3,580 | +46% | — |
| D | 2025-08-11 | 2025-08-09 | WLK | MCCOLLUM MARK A | Dir | M - OptEx | — | +1,128 | 9,656 | +13% | — |
| I | 2025-06-09 | 2025-04-22 | WLK | Buesinger Robert F. | EVP, PEM Segment Head | P - Purchase | $93.39 | +83 | 83 | New | +$7,751 |
| I | 2025-06-09 | 2025-05-27 | WLK | Buesinger Robert F. | EVP, PEM Segment Head | S - Sale | $72.70 | -83 | 0 | -100% | -$6,034 |
| A | 2025-03-07 | 2025-03-05 | WLK | Chao John Tsung-chen | Dir | F - Tax | $108.62 | -391 | 7,038 | -5% | -$42.5K |
| A | 2025-03-07 | 2025-02-20 | WLK | Chao John Tsung-chen | Dir | A - Grant | $0.00 | +955 | 7,664 | +14% | $0 |
| A | 2025-03-06 | 2025-02-18 | WLK | Chao John Tsung-chen | Dir | M - OptEx | $0.00 | +513 | 6,709 | +8% | $0 |
| A | 2025-03-06 | 2025-03-05 | WLK | Chao John Tsung-chen | Dir | F - Tax | $108.62 | -235 | 7,429 | -3% | -$25.5K |
| D | 2025-02-24 | 2025-02-20 | WLK | Chao John Tsung-chen | Dir | A - Grant | $0.00 | +955 | 7,664 | +14% | $0 |
| D | 2025-02-24 | 2025-02-20 | WLK | Chao Albert | Executive COB, Dir | A - Grant | $0.00 | +33.5K | 600.3K | +6% | $0 |
| D | 2025-02-24 | 2025-02-21 | WLK | Chao Albert | Executive COB, Dir | F - Tax | $110.54 | -13.4K | 586.9K | -2% | -$1.48M |
| D | 2025-02-24 | 2025-02-20 | WLK | Holy Jeffrey Adam | VP, CAO | A - Grant | $0.00 | +1,306 | 4,789 | +37% | $0 |
| D | 2025-02-24 | 2025-02-21 | WLK | Holy Jeffrey Adam | VP, CAO | F - Tax | $110.54 | -341 | 4,448 | -7% | -$37.7K |
| D | 2025-02-24 | 2025-02-20 | WLK | Bender Mark Steven | EVP, CFO | A - Grant | $0.00 | +8,819 | 60.5K | +17% | $0 |
| D | 2025-02-24 | 2025-02-21 | WLK | Bender Mark Steven | EVP, CFO | F - Tax | $110.54 | -3,530 | 57.0K | -6% | -$390.2K |
| D | 2025-02-24 | 2025-02-20 | WLK | Chao James | Senior COB, Dir | A - Grant | $0.00 | +16.4K | 61.4K | +36% | $0 |
| D | 2025-02-24 | 2025-02-21 | WLK | Chao James | Senior COB, Dir | F - Tax | $110.54 | -6,554 | 54.9K | -11% | -$724.5K |
| D | 2025-02-24 | 2025-02-20 | WLK | Buesinger Robert F. | EVP, HIP, IT, Digital | A - Grant | $0.00 | +6,839 | 37.7K | +22% | $0 |
| D | 2025-02-24 | 2025-02-21 | WLK | Buesinger Robert F. | EVP, HIP, IT, Digital | F - Tax | $110.54 | -2,738 | 34.9K | -7% | -$302.7K |
| D | 2025-02-24 | 2025-02-21 | WLK | Janssens Thomas J. | SVP, Ops - PEM, Corp Logistic | F - Tax | $110.54 | -606 | 17.1K | -3% | -$67.0K |
| D | 2025-02-24 | 2025-02-20 | WLK | Janssens Thomas J. | SVP, Ops - PEM, Corp Logistic | A - Grant | $0.00 | +2,444 | 17.7K | +16% | $0 |
| D | 2025-02-24 | 2025-02-20 | WLK | Ederington L. Benjamin | EVP, GC, CAO, PEM | A - Grant | $0.00 | +7,305 | 79.2K | +10% | $0 |
| D | 2025-02-24 | 2025-02-21 | WLK | Ederington L. Benjamin | EVP, GC, CAO, PEM | F - Tax | $110.54 | -2,924 | 76.3K | -4% | -$323.2K |
| D | 2025-02-20 | 2025-02-18 | WLK | Ederington L. Benjamin | EVP, GC, CAO, PEM | M - OptEx | $0.00 | +13.2K | 77.1K | +21% | $0 |
| DM | 2025-02-20 | 2025-02-19 | WLK | Ederington L. Benjamin | EVP, GC, CAO, PEM | F - Tax | $111.51 | -5,268 | 72.1K | -7% | -$587.5K |
| D | 2025-02-20 | 2025-02-18 | WLK | Chao James | Senior COB, Dir | M - OptEx | $0.00 | +8,796 | 47.3K | +23% | $0 |
| DM | 2025-02-20 | 2025-02-19 | WLK | Chao James | Senior COB, Dir | F - Tax | $111.51 | -2,287 | 45.2K | -5% | -$255.0K |
| DM | 2025-02-20 | 2025-02-19 | WLK | Bender Mark Steven | EVP, CFO | F - Tax | $111.51 | -4,446 | 51.7K | -8% | -$495.8K |
| D | 2025-02-20 | 2025-02-18 | WLK | Bender Mark Steven | EVP, CFO | M - OptEx | $0.00 | +14.0K | 56.1K | +33% | $0 |
| DM | 2025-02-20 | 2025-02-19 | WLK | Buesinger Robert F. | EVP, HIP, IT, Digital | F - Tax | $111.51 | -4,015 | 31.0K | -11% | -$447.7K |
| D | 2025-02-20 | 2025-02-18 | WLK | Buesinger Robert F. | EVP, HIP, IT, Digital | M - OptEx | $0.00 | +12.9K | 34.8K | +59% | $0 |
| D | 2025-02-20 | 2025-02-18 | WLK | Chao Albert | Executive COB, Dir | M - OptEx | $0.00 | +18.0K | 572.9K | +3% | $0 |
| DM | 2025-02-20 | 2025-02-19 | WLK | Chao Albert | Executive COB, Dir | F - Tax | $111.51 | -6,069 | 566.8K | -1% | -$676.8K |
| D | 2025-02-20 | 2025-02-18 | WLK | Holy Jeffrey Adam | VP, CAO | M - OptEx | $0.00 | +702 | 3,702 | +23% | $0 |
| DM | 2025-02-20 | 2025-02-19 | WLK | Holy Jeffrey Adam | VP, CAO | F - Tax | $111.51 | -219 | 3,492 | -6% | -$24.4K |
| D | 2025-02-20 | 2025-02-18 | WLK | Janssens Thomas J. | SVP, Ops - PEM, Corp Logistic | M - OptEx | $0.00 | +1,313 | 15.6K | +9% | $0 |
| DM | 2025-02-20 | 2025-02-19 | WLK | Janssens Thomas J. | SVP, Ops - PEM, Corp Logistic | F - Tax | $111.50 | -336 | 15.3K | -2% | -$37.5K |
Purchase Sale Sale after option exercise All abbreviations