As of January 2026 Westlake Corporation has a market cap of $11.27 Billion USD. This makes Westlake Corporation the world's 1837th 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 Jan 16th, 2026 the market cap of Westlake Corporation was reported to be: