Telefónica, S.A. (Spanish pronunciation: [teleˈfonika]) is a Spanish multinational telecommunications company headquartered in Madrid, Spain. It is one of the largest telephone operators and mobile network providers in the world. It provides fixed and mobile telephony, broadband and subscription television, operating in Europe and America.
As well as the Telefónica brand, it also trades as Movistar, O2 and Vivo. The company is a component of the Euro Stoxx 50 stock market index. As of May 2017, Telefónica was the 110th largest company in the world, according to Forbes.