As of September 2026 Sumitomo Denki Kōgyō has a market cap of ₹3.936 Trillion. This makes Sumitomo Denki Kōgyō the world's 623th 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.