As of May 2026 NTT (Nippon Telegraph & Telephone) has a market cap of $76.95 Billion USD. This makes NTT (Nippon Telegraph & Telephone) the world's 313th 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.