With a market capitalization (market cap) of $8.14B — a measure of how much the company is worth — Westlake Corporation ranks #1,040 among the 2,510 companies tracked, and 68th in Basic Materials as of October 3, 2026. Shares trade at $63.50, up 1.65% on the day.
of 2,510 tracked
Market-cap change uses historical capitalization records. Share-price returns are a different series — they can diverge when the share count changes. Those returns are not a CAGR until you pick a start value, an ending value, and years. CAGR calculator. Market cap vs. stock price.
Year-end values and the chart both come from historical market-cap records, not from applying today's share count to past prices. Latest historical observation October 2, 2026. Ranking headline cap is the snapshot figure as of October 3, 2026.
| Year | As of | Market cap | Annual change | Year-end close |
|---|---|---|---|---|
| 2026 | Oct 2, 2026 | $8.13B | -14.09% | $63.50 |
| 2025 | Dec 31, 2025 | $9.46B | -35.67% | $73.94 |
| 2024 | Dec 31, 2024 | $14.71B | -17.99% | $114.65 |
| 2023 | Dec 29, 2023 | $17.94B | +37.17% | $139.96 |
| 2022 |
Ranking figure $8.14B as of October 3, 2026.
Westlake Corporation's ranking market cap is the provider-reported capitalization on the same snapshot as the rest of this site, with a share price of $63.50 as of October 2, 2026. Charts and the year-end table use a separate historical market-cap series, last observed at $8.13B on October 2, 2026. See how the ranking works.
Live shares outstanding are not on the quote used for price, so this page does not invent a current share count. Shares outstanding vs. float.
The latest annual report (FY 2025) used a weighted-average 128,909,952 shares. That figure is an average for the year, not the live count in the market-cap formula.
Book equity: assets minus liabilities on the latest annual report.
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FY 2025 net worth
Largest U.S.-listed names in the same FMP sector — not a hand-picked competitor set.
| Rank | Company | Market cap | 1D |
|---|---|---|---|
| #65 | Linde plc LIN | $221.81B | +2.14% |
| #67 | BHP Group Limited BHP | $218.65B | +1.68% |
| #87 | Southern Copper Corporation |
Westlake Corporation operates as a global producer and supplier of petrochemicals, polymers, and a diverse range of building materials. Its business activities are structured into two main divisions: Performance and Essential Materials, and Housing and Infrastructure Products. The Performance and Essential Materials segment focuses on the manufacture and distribution of various chemical components, including polyethylene, styrene monomer, ethylene co-products, PVC, VCM, ethylene dichloride chlor-alkali, and related chlorinated derivatives.
Summary from the company profile (Financial Modeling Prep). Principal financial figures above are for FY 2025.
Visit websiteAs of October 3, 2026, Westlake Corporation (WLK) is worth $8.14B — that is its market capitalization, the total value of its outstanding shares on MarketCapLens.
A company’s net worth is its shareholders’ equity: assets minus liabilities on the balance sheet. That is book equity, not market cap. For FY 2025, Westlake Corporation’s book equity is about $9.3B. Market cap is the market value of the outstanding shares. As of October 3, 2026, its market cap is $8.14B. Book equity is an accounting remainder; market cap is a trading value. Neither is a person’s net worth.
Westlake Corporation ranks #1,040 among the 2,510 companies tracked on MarketCapLens. In Basic Materials it ranks #68 of 173.
Fundamentals are annual. Figures labeled with their fiscal year. Live ratios use the current price against those annual earnings.
| Dec 30, 2022 |
| $13.08B |
| +5.13% |
| $102.54 |
| 2021 | Dec 31, 2021 | $12.44B | — | $97.13 |
|---|
Last observation of each calendar year from historical market-cap records. The current year is through the latest date, not a completed year-end. Share-price close is the matching session for context — we do not rebuild cap from today's share count.
Not in this snapshot
FY 2025
| $171.49B |
| +3.17% |
| #101 | Rio Tinto Group RIO | $153.09B | +1.44% |
| #127 | Newmont Corporation NEM | $121.76B | +0.78% |
| #150 | Freeport-McMoRan Inc. FCX | $103.56B | +3.98% |
Companies immediately above and below in the overall ranking. They may be in a different sector.
| Rank | Company | Market cap | 1D |
|---|---|---|---|
| #1037 | Cytokinetics, Incorporated CYTK | $8.16B | -0.03% |
| #1038 | Zeta Global Holdings Corp. ZETA | $8.16B | +0.71% |
| #1039 | Vaxcyte, Inc. PCVX | $8.16B | +0.77% |
| #1041 | The Gap, Inc. GAP | $8.1B | -0.97% |
| #1042 | Booz Allen Hamilton Holding Corporation BAH | $8.1B | -4.43% |
| #1043 | Ralliant Corp RAL | $8.1B | +3.39% |
Westlake Corporation’s ranking market cap of $8.14B comes from the same snapshot as the rest of this site, as of October 3, 2026. It is not share price multiplied by the FY 2025 weighted-average share count of 128,909,952. The historical market-cap series last observed $8.13B on October 2, 2026.
Over the past year, Westlake Corporation’s market cap is down 21.03%, using historical market-cap records rather than today’s share count applied to past prices.
Westlake Corporation (WLK) shares trade at $63.50, up 1.65% on the day, as of October 3, 2026.
Live P/E is share price divided by annual earnings per share. It is blank when earnings are missing, zero, or negative — not a 0× multiple.