As of December 2025 LyondellBasell has a market cap of โน1.248 Trillion. This makes LyondellBasell the world's 1503th 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 Dec 4th, 2025 the market cap of LyondellBasell was reported to be: