As of September 2026 Westlake Corporation has a market cap of ยฃ6.59 Billion. This makes Westlake Corporation the world's 2223th most valuable company by market cap according to our data. The market capitalization, commonly called market cap, is the total market value of a publicly traded company's outstanding shares and is commonly used to measure how much a company is worth.
On Sep 18th, 2026 the market cap of Westlake Corporation was reported to be: