Vodafone Group Plc is a British multinational telecommunications company headquartered in London and with its registered office in Newbury, Berkshire. It is the world's second-largest mobile telecommunications company measured by both subscribers and 2011 revenues (in each case behind China Mobile), and had 439 million subscribers as of December 2011.
Vodafone owns and operates networks in over 30 countries and has partner networks in over 40 additional countries. Its Vodafone Global Enterprise division provides telecommunications and IT services to corporate clients in over 65 countries. Vodafone also owns 45% of Verizon Wireless, the largest mobile telecommunications company in the United States measured by subscribers.
Vodafone has a primary listing on the London Stock Exchange and is a constituent of the FTSE 100 Index. It had a market capitalisation of approximately £89.1 billion as of 6 July 2012, the third-largest of any company listed on the London Stock Exchange. It has a secondary listing on NASDAQ. [Source: Wikipedia]