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
MAMA & Company by LN-Gaity, a joint venture of Live Nation UK and the parent company of MCD Productions. According to the reports three MAMA venues, the Ritz in Manchester, the Forum in Kentish Town and the Institute in Birmingham, would be rebranded by Live Nation as the O2 Ritz Manchester, O2 Forum Kentish town and O2 Institute Birmingham. MAMA & Company MAMA & Company is a live music and lifestyle entertainment company which was founded in 2005 and owns and operates a number of live music venues and festivals in the United Kingdom. The company owns six London venues and three regional