Valued at $210.3 billion by market cap, T-Mobile US, Inc. (TMUS) is one of the largest wireless telecommunications companies in the United States, providing mobile phone, broadband, and wireless communication services to consumers and businesses. Headquartered in Bellevue, Washington, the company operates a nationwide 4G LTE and 5G network and serves tens of millions of subscribers across the country.
Shares of TMUS have underperformed the broader market over the past year. TMUS has declined 23.9% over this time frame, while the broader S&P 500 Index ($SPX) has rallied nearly 31.4%. In 2026, TMUS stock is down 4.9%, compared to the SPX’s 7.6% rise on a YTD basis.
