AT&T Inc. is a North American telecommunications company. In addition to telephone, data and video telecommunications, AT&T also provides mobile communications and internet services for companies, private customers and government organizations. AT&T has long had a monopoly in the United States and Canada.
As of December 2025 AT&T has a market cap of โน15.901 Trillion. This makes AT&T the world's 99th 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 8th, 2025 the market cap of AT&T was reported to be: