O2 (UK) they can do it too" in reference to Vodafone and EE, O2's biggest competitors and the UK's top three mobile-telecoms companies. O2 (UK) Telefónica UK Limited (trading as O2 – stylised as O) is a telecommunications services provider in the United Kingdom, owned by the Spanish multinational Telefónica, and is headquartered in Slough. With 25 million subscribers (as of December 2017), O2 is the second-largest mobile network operator in the United Kingdom after EE, with Vodafone in third place. O2 was formed in 1985 as Cellnet, a 60:40 joint venture between BT Group and Securicor. In 1999, BT Group acquired
CMP Technology Service Mark 'WEB 2.0'. In 1971, Gerard "Gerry" Leeds and his wife, Lilo, founded the company. Their sons Michael and Daniel managed the company in 1988, and launched TechWeb. CMP was sold to United Business Media's Miller Freeman in 1999 and in 2000, the IT portion of Miller Freeman was merged into CMP. In 2008, UBM broke CMP into pieces. "Today, the name is gone and what's left of the company is part of the British media conglomerate, UBM plc," according to Newsday. Recent acquisitions include Semiconductor Insights, LightReading, MediaLive International, Black Hat and Shorecliff Communications. CMP Technology CMP Technology