As of October 2026 T-Mobile US has a market cap of $162.90 Billion USD. This makes T-Mobile US the world's 131th 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 Oct 11th, 2026 the market cap of T-Mobile US was reported to be: