O2 (UK) 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 Securicor's share of Cellnet and the company was later rebranded as BT Cellnet. In June 2000, BT Cellnet launched the world's
Zeus Technology Zeus Technology Zeus Technology, Ltd. was a software company founded in 1995 and based in Cambridge, England, known for its web server. In July 2011, Zeus Technology was acquired by Riverbed Technology. In March 2015, Riverbed Technology sold the SteelApp business unit to Brocade Communications Systems Zeus Technology was founded in 1995 by Damian Reeves and Adam Twiss while they were undergraduates at Churchill College, University of Cambridge. The company grew rapidly during the excesses of the Dot-com boom. In June 2000 Zeus Technology was nominated one of the top 50 most important privately held companies in the world by