As of December 2025 Sumitomo Mitsui Trust Holdings has a market cap of โฌ18.00 Billion. This makes Sumitomo Mitsui Trust Holdings the world's 1061th 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.