Westlake Corp
WLKFigures shown here come from public SEC filings. Dates beside each section show the available history.
How Westlake Corp Makes Money
Follow each dollar of revenue through to what shareholders keep.
From revenue to net income
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Financial Summary
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SEC filings supply these figures; updates after the dates shown are not included. This page includes 16 annual periods. The latest annual period ends Dec 31, 2025. The latest insider filing shown is dated Jun 16, 2026. The latest institutional report shown is dated Mar 31, 2026; other ownership filings may exist.
Ownership
Who holds the shares, as reported in SEC ownership filings.
Reported 13F positions
Each row shows what a filer reported for one date, not a current position. The link opens that filing.
| Filer | Report date | Shares | Value | Filing |
|---|---|---|---|---|
| MANUFACTURERS LIFE INSURANCE COMPANY, THE | 2026-03-31 | 33,295 | $3.89M | SEC filing |
| ENVESTNET ASSET MANAGEMENT INC | 2026-03-31 | 28,046 | $3.28M | SEC filing |
| Corient Private Wealth LLC | 2026-03-31 | 34,971 | $4.06M | SEC filing |
| Pinnacle Wealth Planning Services, Inc. | 2026-03-31 | 58 | $6.78K | SEC filing |
| DIMENSIONAL FUND ADVISORS LP | 2026-03-31 | 1,466,020 | $171M | SEC filing |
| Swiss Life Asset Management Ltd | 2026-03-31 | 2,253 | $263K | SEC filing |
| CAPSTONE INVESTMENT ADVISORS, LLC | 2026-03-31 | 135,808 | $15.9M | SEC filing |
| PICKERING ENERGY PARTNERS LP | 2026-03-31 | 1,000 | $117K | SEC filing |
| Rockefeller Capital Management L.P. | 2026-03-31 | 857 | $100K | SEC filing |
| American Capital Advisory, LLC | 2026-03-31 | 7 | $818 | SEC filing |
| Woodline Partners LP | 2026-03-31 | 337,075 | $39.4M | SEC filing |
| SG Americas Securities, LLC | 2026-03-31 | 24,576 | Not shown | SEC filing |
| UBS Group AG | 2026-03-31 | 811,266 | $94.8M | SEC filing |
| Meiji Yasuda Asset Management Co Ltd. | 2026-03-31 | 79,478 | $9.28M | SEC filing |
| Sterling Capital Management LLC | 2026-03-31 | 1,122 | $131K | SEC filing |
| Bruce G. Allen Investments, LLC | 2026-03-31 | 31 | $3.62K | SEC filing |
| KLP KAPITALFORVALTNING AS | 2026-03-31 | 8,500 | $993K | SEC filing |
| SJS Investment Consulting Inc. | 2026-03-31 | 22 | $2.57K | SEC filing |
| Torren Management, LLC | 2026-03-31 | 13 | $1.57K | SEC filing |
| Zurcher Kantonalbank (Zurich Cantonalbank) | 2026-03-31 | 19,174 | $2.24M | SEC filing |
- Each value is checked against Westlake Corp's share prices from within about three months of its report date (insiders' Form 4 trades and the latest close).
- Value not shown for 1 row: the filed value is about 1,000 times too small for the share count at Westlake Corp's share price.
120 filers have only one report here.
Unusually large insider trades
Each trade is compared with the other insider trades of the same kind in the same security among Westlake Corp's recent filings on file. Size alone is context, not a prediction or evidence of improper trading.
- 2026-02-27 · Bender Mark Steven: Larger than 10 of the 11 other insider sales of Common Stock on file. SEC filing
- 2025-12-22 · Chao Albert: Larger than all 11 other insider sales of Common Stock on file. SEC filing
Purchases & sales (open market or private)
| Security | Code | Price | Filing | |||
|---|---|---|---|---|---|---|
| 2026-03-27 | Bender Mark Steven · EVP & CFO | Common Stock | S — Open market or private sale | −16,413 | 112.54 | SEC filing |
| 2026-03-27 | Buesinger Robert F. · EVP, PEM Segment Head | Common Stock | S — Open market or private sale | −4,000 | 115.25 | SEC filing |
| 2026-02-27 | Bender Mark Steven · EVP & CFO | Common Stock | S — Open market or private sale | −421 | 101.52 | SEC filing |
| 2026-02-27 | Bender Mark Steven · EVP & CFO | Common Stock | S — Open market or private sale | −16,988 | 100.91 | SEC filing |
| 2025-12-22 | Chao Albert · Executive Chairman | Common Stock | S — Open market or private sale | −521 | 74.44 | SEC filing |
| 2025-12-22 | Chao Albert · Executive Chairman | Common Stock | S — Open market or private sale | −30,604 | 73.80 | SEC filing |
| 2025-12-22 | Chao Albert · Executive Chairman | Common Stock | S — Open market or private sale | −9,711 | 72.82 | SEC filing |
| 2025-05-27 | Buesinger Robert F. · EVP, PEM Segment Head | Common Stock | S — Open market or private sale | −83 | 72.70 | SEC filing |
Showing 8 of 11 rows
Grants, exercises, tax & gifts
| Security | Code | Filing | |||
|---|---|---|---|---|---|
| 2026-06-15 | Baksht Jonathan · SVP and CFO | Restricted Stock Units | A — Grant, award, or other acquisition | +20,580 | SEC filing |
| 2026-05-13 | Bender Mark Steven · EVP & CFO | Common Stock | F — Payment of exercise price or tax by delivering securities | −5,284 | SEC filing |
| 2026-05-12 | Bender Mark Steven · EVP & CFO | Common Stock | M — Exercise or conversion of derivative security | +13,164 | SEC filing |
| 2026-05-12 | Bender Mark Steven · EVP & CFO | Restricted Stock Units | M — Exercise or conversion of derivative security | −13,164 | SEC filing |
| 2026-04-02 | Powers Brian John · SVP, PEM Segment Head | Restricted Stock Units | A — Grant, award, or other acquisition | +1,961 | SEC filing |
| 2026-02-27 | Bender Mark Steven · EVP & CFO | Common Stock | M — Exercise or conversion of derivative security | +6,199 | SEC filing |
| 2026-02-27 | Bender Mark Steven · EVP & CFO | Employee Option (right to buy) | M — Exercise or conversion of derivative security | −6,494 | SEC filing |
| 2026-02-27 | Bender Mark Steven · EVP & CFO | Employee Option (right to buy) | M — Exercise or conversion of derivative security | −6,199 | SEC filing |
Showing 8 of 32 rows
Other activity
| Security | Code | Filing | |||
|---|---|---|---|---|---|
| 2026-02-27 | Bender Mark Steven · EVP & CFO | Common Stock | D — Disposition to the issuer | −12,693 | SEC filing |
| 2024-08-23 | Janssens Thomas J. · SVP, Ops - PEM & Corp Logistic | Common Stock | D — Disposition to the issuer | −14,864 | SEC filing |
| 2024-08-16 | Chao Albert · Executive Chairman | Common Stock | D — Disposition to the issuer | −7 | SEC filing |
| 2024-08-16 | Chao Albert · Executive Chairman | Common Stock | D — Disposition to the issuer | −45,291 | SEC filing |
| 2024-05-07 | Buesinger Robert F. · EVP, HIP, IT & Digital | Common Stock | D — Disposition to the issuer | −3,133 | SEC filing |
Showing 5 of 5 rows
These tables describe filed transactions, not current holdings. Prices are shown as filed; a currency is added only when the filing's data names one. Amended and possible duplicate rows are left out of size comparisons and transaction groups.