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Telefonica is the number one Spanish multinational by market capitalisation and one of the largest private telecommunication companies in the world . Telefonica ’ s brands include the eponymous Telefonica , Movistar , O2 and Vivo . Forbes reports that the business had a market value of $ 81bn in 2018 , generating around $ 60bn in sales . The company was founded in 1924 and is headquartered in Madrid , Spain . www . telefonica . com www . businesschief . com