As of January 2026 Westlake Corporation has a market cap of NZ$19.00 Billion. This makes Westlake Corporation the world's 1871th 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 12th, 2026 the market cap of Westlake Corporation was reported to be: