Westlake Corporation (WLK) Insider Trading
Over the last 3 months, WLK insiders made 0 open-market buys and 2 sales, a net sale of -$2.3M (SEC Form 4). Over the last 6 months, 238 institutions increased and 205 reduced their position (13F).
Insider Activity
Sentiment
0/100
Buys (3m)
0
Sells (3m)
2
Net (3m)
-$2.3M
Insider trades by month Buys Sells
May
Nov
Dec
Jun
Dec
Mar
Context3-month price -18.6%Institutions mixed (13F)
| Date | Insider | Type | Shares | Price |
|---|---|---|---|---|
| May 14, 2026 | Bender Mark Stevenofficer: EVP & CFO | Tax | 5,284 | $97.34 |
| May 14, 2026 | Bender Mark Stevenofficer: EVP & CFO | Option | 13,164 | — |
| Apr 6, 2026 | Powers Brian Johnofficer: SVP, PEM Segment Head | Grant | 1,961 | — |
| Mar 31, 2026 | Buesinger Robert F.officer: EVP, PEM Segment Head | Sell | 4,000 | $115.25 |
| Mar 30, 2026 | Bender Mark Stevenofficer: EVP & CFO | Sell | 16,413 | $112.53 |
| Mar 6, 2026 | Bender Mark Stevenofficer: EVP & CFO | Tax | 1,171 | $104.96 |
| Mar 2, 2026 | Bender Mark Stevenofficer: EVP & CFO | Option | 6,199 | $65.81 |
| Mar 2, 2026 | Bender Mark Stevenofficer: EVP & CFO | Option | 6,494 | $86.54 |
| Mar 2, 2026 | Bender Mark Stevenofficer: EVP & CFO | Sell | 421 | $101.52 |
| Mar 2, 2026 | Bender Mark Stevenofficer: EVP & CFO | Sell | 16,988 | $100.91 |
| Feb 24, 2026 | Patel Bhavesh V.director | Grant | 1,852 | — |
| Feb 23, 2026 | Buesinger Robert F.officer: EVP, PEM Segment Head | Grant | 5,281 | — |
| Feb 23, 2026 | Chao Jamesdirector, officer: Senior Chairman | Grant | 27,382 | $94.48 |
| Feb 23, 2026 | Chao Albertdirector, officer: Executive Chairman | Grant | 14,945 | — |
| Feb 23, 2026 | Ederington L. Benjaminofficer: EVP, Legal & External Affairs | Grant | 1,425 | — |
| Feb 23, 2026 | Buesinger Robert F.officer: EVP, PEM Segment Head | Grant | 1,301 | — |
| Feb 23, 2026 | Chao Jamesdirector, officer: Senior Chairman | Grant | 7,472 | — |
| Feb 23, 2026 | Chao John Tsung-chendirector | Grant | 2,434 | — |
| Feb 23, 2026 | Chao Jamesdirector, officer: Senior Chairman | Grant | 3,884 | — |
| Feb 23, 2026 | Chao Albertdirector, officer: Executive Chairman | Grant | 6,193 | — |
| Feb 23, 2026 | Ederington L. Benjaminofficer: EVP, Legal & External Affairs | Grant | 7,002 | — |
| Feb 23, 2026 | Chao Albertdirector, officer: Executive Chairman | Tax | 2,501 | $94.10 |
| Feb 23, 2026 | Chao Jamesdirector, officer: Senior Chairman | Tax | 1,569 | $94.10 |
| Feb 23, 2026 | Bender Mark Stevenofficer: EVP & CFO | Grant | 1,777 | — |
| Feb 23, 2026 | Chao John Tsung-chendirector | Grant | 1,104 | — |
| Feb 23, 2026 | Szwejbka Scott Thomasofficer: SVP, HIP Segment Head | Tax | 91 | $94.10 |
| Feb 23, 2026 | Chao John Tsung-chendirector | Tax | 91 | $94.10 |
| Feb 23, 2026 | Ederington L. Benjaminofficer: EVP, Legal & External Affairs | Tax | 357 | $94.10 |
| Feb 23, 2026 | Szwejbka Scott Thomasofficer: SVP, HIP Segment Head | Grant | 3,983 | — |
| Feb 23, 2026 | Buesinger Robert F.officer: EVP, PEM Segment Head | Tax | 326 | $94.10 |
Source: WLK SEC Form 4 filings, latest May 14, 2026. For informational purposes only — not investment advice.
Institutional activity (13F)
How institutions changed their WLK positions over the last 6 months (SEC Form 13F).
Increased
238
New positions
137
Reduced
205
Sold out
108
Largest moves
| Institution | Action | Shares | Filed |
|---|---|---|---|
| ORBIS ALLAN GRAY LTD | Increased | 5.3M | May 15, 2026 |
| ORBIS ALLAN GRAY LTD | Increased | 4.4M | Feb 17, 2026 |
| WELLINGTON MANAGEMENT GROUP LLP | Increased | 4.2M | Feb 17, 2026 |
| CAPITAL WORLD INVESTORS | Increased | 4.2M | May 13, 2026 |
| VANGUARD GROUP INC | Increased | 3.9M | Jan 29, 2026 |
| BLACKROCK, INC. | Increased | 3.3M | Feb 12, 2026 |
| BLACKROCK, INC. | Reduced | 3.1M | May 13, 2026 |
| PRICE T ROWE ASSOCIATES INC /MD/ | Increased | 2.4M | May 15, 2026 |
| PRICE T ROWE ASSOCIATES INC /MD/ | Increased | 2.2M | Feb 17, 2026 |
| CAPITAL WORLD INVESTORS | New Position | 2.2M | Feb 11, 2026 |
| DIMENSIONAL FUND ADVISORS LP | Increased | 1.9M | Feb 12, 2026 |
| BRANDES INVESTMENT PARTNERS, LP | Increased | 1.8M | May 15, 2026 |
| WELLINGTON MANAGEMENT GROUP LLP | Reduced | 1.8M | May 15, 2026 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | New Position | 1.8M | May 8, 2026 |
| BRANDES INVESTMENT PARTNERS, LP | Increased | 1.7M | Feb 11, 2026 |
Source: SEC Form 13F filings. For informational purposes only — not investment advice.