As of March 2026 Westlake Corporation has a market cap of A$18.99 Billion. This makes Westlake Corporation the world's 1558th 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 Mar 10th, 2026 the market cap of Westlake Corporation was reported to be: