As of December 2025 T-Mobile US has a market cap of โฌ188.81 Billion. This makes T-Mobile US the world's 73th 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 19th, 2025 the market cap of T-Mobile US was reported to be: