Westlake Corp
WLK- Exchange
- NYSE
- Industry
- Industrial Organic Chemicals
- SEC CIK
- 0001262823
In the last 90 days, Westlake Corp insiders filed 0 open-market purchases and 1 sale; 360 institutions reported holding it in 13F filings for Q2 2026, worth $2.91B in total; no superinvestor holds it.
Open-market trades, last 90 days
Open-market purchases (P) and sales (S) by Westlake Corp insiders, counted by Form 4 filing. Trades with a flagged price and duplicate filings are left out.
- Open-market buys
- 0 filings
- Open-market sells
- 1 filing
- 1 insider, $3.12M in total
- Insiders trading
- 1
- Net value
- −$3.12M
- Purchases minus sales
Insider roster
Directors, officers and 10% owners who have filed a Form 4 for Westlake Corp, current and former, most recent filer first. Last reported holding is the position after the last non-derivative trade in their latest filing.
| Name | Title | Last reported holding | Last filing | Filings, past year |
|---|---|---|---|---|
| Darby Tommy | VP and CAO | – | Sep 1, 2026 | 1 |
| Sheets Jeffrey Wayne | Director | 14,927 | Aug 17, 2026 | 2 |
| Sabat Carolyn Chao | Director | 5,748 | Aug 17, 2026 | 2 |
| Patel Bhavesh V. | Director | – | Aug 17, 2026 | 2 |
| Northcutt R Bruce | Director | 23,351 | Aug 17, 2026 | 2 |
| McCollum Mark A | Director | 11,824 | Aug 17, 2026 | 2 |
| Lubel Kimberly S | Director | 13,821 | Aug 17, 2026 | 2 |
| Graff Michael J | Director | 23,310 | Aug 17, 2026 | 2 |
| Cregg Roger A | Director | 3,507 | Aug 17, 2026 | 3 |
| Chao David Tsung-Hung | Director | 11,080 | Aug 17, 2026 | 2 |
| Chao Catherine T. | Director | 7,748 | Aug 17, 2026 | 2 |
| Chao Albert | Executive Chairman | 642,880 | Aug 11, 2026 | 4 |
| Baksht Jonathan | SVP and CFO | – | Jun 16, 2026 | 1 |
| Bender Mark Steven | EVP & CFO | 35,895 | May 14, 2026 | 6 |
| Powers Brian John | SVP, PEM Segment Head | – | Apr 6, 2026 | 1 |
| Buesinger Robert F. | EVP, PEM Segment Head | 34,482 | Mar 31, 2026 | 3 |
| Chao James | Senior Chairman | 49,774 | Feb 23, 2026 | 2 |
| Ederington L. Benjamin | EVP, Legal & External Affairs | 80,158 | Feb 23, 2026 | 2 |
| Chao John Tsung-chen | Director | 7,888 | Feb 23, 2026 | 2 |
| Holy Jeffrey Adam | VP and CAO | 5,124 | Feb 23, 2026 | 2 |
| Gilson Jean-Marc | President and CEO | – | Feb 23, 2026 | 1 |
| Szwejbka Scott Thomas | SVP, HIP Segment Head | 13,773 | Feb 23, 2026 | 3 |
| Janssens Thomas J. | SVP, Ops - PEM & Corp Logistic | 17,127 | Feb 24, 2025 | 0 |
| Haas Marius | Director | 11,631 | Aug 12, 2024 | 0 |
| Zoeller Johnathan Stevan | VP and CAO | 4,416 | Mar 22, 2024 | 0 |
| Kearns Roger L. | COO and EVP, PEM | 39,849 | Mar 15, 2023 | 0 |
| Jenkins Dorothy C | Director, 10% Owner | 73,778 | Aug 15, 2022 | 0 |
| Kenner Andrew | SVP, Operations | 20,362 | Feb 22, 2022 | 0 |
Insider trades
Each row adds up one type of transaction in one Form 4 filing. Only open-market purchases (P) and sales (S) are shown by default; use the filters to see grants, option exercises and other codes.
| Filed (ET) | Trade date | Filing delay | Insider | Transaction | Shares | Avg price | Value | Holding change | Flags |
|---|---|---|---|---|---|---|---|---|---|
| Aug 11, 2026 (view filing)5:45 PM ET | Aug 11 | Same day | Chao AlbertExecutive Chairman | SSale | −38.9K | $80.28 | −$3.12M | −5.7%642.9K after | 2 lots |
| Mar 31, 2026 (view filing) | Mar 27 | 4 days | Buesinger Robert F.EVP, PEM Segment Head | SSale | −4.00K | $115.25 | −$461.0K | −10.4%34.5K after | |
| Mar 30, 2026 (view filing) | Mar 27 | 3 days | Bender Mark StevenEVP & CFO | SSale | −16.4K | $112.54 | −$1.85M | −36.9%28.0K after | |
| Mar 2, 2026 (view filing) | Feb 27 | 3 days | Bender Mark StevenEVP & CFO | SSale | −17.4K | $100.92 | −$1.76M | −28.2%44.4K after | 2 lots |
| Dec 23, 2025 (view filing) | Dec 22 | 1 day | Chao AlbertExecutive Chairman | SSale | −40.8K | $73.58 | −$3.00M | −6.1%627.7K after | 3 lots |
| Jun 9, 2025 (view filing) | Apr 22 | 48 daysLate | Buesinger Robert F.EVP, PEM Segment Head | PPurchase | +83 | $93.39 | +$7.75K | New position83 after | |
| Jun 9, 2025 (view filing) | May 27 | 13 daysLate | Buesinger Robert F.EVP, PEM Segment Head | SSale | −83 | $72.70 | −$6.03K | −100.0%0 after | |
| Dec 2, 2024 (view filing) | Nov 29 | 3 days | Chao David Tsung-HungDirector | SSale | −1.75K | $129.08 | −$225.9K | −18.4%7.78K after | |
| Nov 25, 2024 (view filing) | Nov 22 | 3 days | Chao David Tsung-HungDirector | SSale | −1.75K | $130.00 | −$227.5K | −15.5%9.53K after | |
| May 13, 2024 (view filing) | May 9 | 4 days | Buesinger Robert F.EVP, HIP, IT & Digital | SSale | −3.50K | $158.50 | −$554.8K | −16.6%17.6K after | |
| May 6, 2024 (view filing) | May 3 | 3 days | Bender Mark StevenEVP & CFO | SSale | −4.95K | $152.19 | −$753.3K | −10.9%40.4K after | |
| Mar 18, 2024 (view filing) | Mar 15 | 3 days | Buesinger Robert F.EVP, HIP, IT & Digital | SSale | −3.88K | $144.50 | −$560.4K | −15.5%21.1K after | |
| Mar 14, 2024 (view filing) | Mar 13 | 1 day | Buesinger Robert F.EVP, HIP, IT & Digital | SSale | −122 | $144.50 | −$17.6K | −0.5%25.0K after | |
| Mar 7, 2024 (view filing) | Mar 6 | 1 day | Bender Mark StevenEVP & CFO | SSale | −4.80K | $141.02 | −$677.5K | −9.6%45.3K after | |
| Feb 28, 2024 (view filing) | Feb 26 | 2 days | Bender Mark StevenEVP & CFO | SSale | −4.85K | $137.57 | −$667.8K | −8.8%50.1K after | |
| Nov 17, 2023 (view filing) | Nov 15 | 2 days | Buesinger Robert F.EVP, HIP, IT & Digital | SSale | −4.21K | $130.50 | −$550.1K | −20.1%16.8K after | |
| Aug 24, 2023 (view filing) | Aug 23 | 1 day | Chao David Tsung-HungDirector, 10% Owner | SSale | −1.00K | $131.00 | −$131.0K | −9.0%10.1K after | |
| Sep 1, 2022 (view filing) | Aug 31 | 1 day | Buesinger Robert F.EVP, HIP, IT & Digital | SSale | −1.00K | $98.94 | −$98.9K | −8.9%10.2K after | |
| Aug 29, 2022 (view filing) | Aug 26 | 3 days | Zoeller Johnathan StevanVP & Chief Accounting Officer | SSale | −542 | $107.08 | −$58.0K | −50.0%543 after | |
| May 31, 2022 (view filing) | May 27 | 4 days | Buesinger Robert F.EVP, HIP, IT & Digital | SSale | −14.4K | $129.47 | −$1.87M | −55.1%11.8K after | |
| May 23, 2022 (view filing) | May 19 | 4 days | Chao AlbertPresident & CEO | SSale | −37.9K | $130.38 | −$4.94M | −7.4%473.0K after | 3 lots |
| May 18, 2022 (view filing) | May 17 | 1 day | Kearns Roger L.COO and EVP - PEM | SSale | −8.39K | $136.24 | −$1.14M | −24.1%26.4K after | |
| May 6, 2022 (view filing) | May 5 | 1 day | Ederington L. BenjaminEVP, GC, CAO and Secretary | SSale | −12.6K | $139.81 | −$1.76M | −25.1%37.4K after | 2 lots |
| Apr 1, 2022 (view filing) | Mar 31 | 1 day | Bender Mark StevenEVP and CFO | SSale | −6.02K | $124.35 | −$748.7K | −16.4%30.7K after | 2 lots |
| Mar 31, 2022 (view filing) | Mar 30 | 1 day | Bender Mark StevenEVP and CFO | SSale | −6.00K | $124.81 | −$748.8K | −16.3%30.7K after | 2 lots |
| Mar 30, 2022 (view filing) | Mar 29 | 1 day | Bender Mark StevenEVP and CFO | SSale | −4.00K | $122.44 | −$489.8K | −11.5%30.7K after | |
| Mar 28, 2022 (view filing) | Mar 25 | 3 days | Kearns Roger L.COO and EVP - PEM | SSale | −10.3K | $126.00 | −$1.30M | −28.1%26.4K after | 2 lots |
| Mar 28, 2022 (view filing) | Mar 25 | 3 days | Bender Mark StevenEVP and CFO | SSale | −8.00K | $125.34 | −$1.00M | −20.7%30.7K after | 2 lots |
| Mar 25, 2022 (view filing) | Mar 24 | 1 day | Bender Mark StevenEVP and CFO | SSale | −8.00K | $125.38 | −$1.00M | −20.7%30.7K after | |
| Mar 24, 2022 (view filing) | Mar 23 | 1 day | Bender Mark StevenEVP and CFO | SSale | −6.00K | $125.17 | −$751.0K | −16.3%30.7K after | 2 lots |
| Mar 14, 2022 (view filing) | Mar 10 | 4 days | Buesinger Robert F.EVP, HIP, IT & Digital | SSale | −22.6K | $117.61 | −$2.65M | −60.3%14.8K after | |
| Mar 10, 2022 (view filing) | Mar 9 | 1 day | Buesinger Robert F.EVP, HIP, IT & Digital | SSale | −2.73K | $115.55 | −$315.5K | −15.5%14.8K after | |
| Mar 2, 2022 (view filing) | Mar 1 | 1 day | Zoeller Johnathan StevanVP and CAO | SSale | −1.01K | $110.39 | −$111.1K | −46.5%1.16K after | |
| Dec 6, 2021 (view filing) | Dec 2 | 4 days | Chao AlbertPresident & CEO | SSale | −30.8K | $91.85 | −$2.83M | −6.5%441.9K after | 4 lots |
| Dec 3, 2021 (view filing) | Dec 1 | 2 days | Chao AlbertPresident & CEO | SSale | −30.8K | $91.75 | −$2.82M | −6.5%441.9K after | 6 lots |
| Nov 15, 2021 (view filing) | Nov 11 | 4 days | Bender Mark StevenEVP and CFO | SSale | −2.37K | $101.57 | −$240.6K | −9.7%22.0K after | |
| Nov 10, 2021 (view filing) | Nov 8 | 2 days | Bender Mark StevenEVP and CFO | SSale | −631 | $100.77 | −$63.6K | −2.5%24.4K after | |
| Nov 8, 2021 (view filing) | Nov 5 | 3 days | Bender Mark StevenEVP and CFO | SSale | −6.36K | $98.80 | −$628.0K | −20.3%25.0K after | |
| Aug 12, 2021 (view filing) | Aug 11 | 1 day | Chao AlbertPresident & CEO | PPurchase | +3.00K | $86.21 | +$258.6K | +0.7%441.9K after |