Joint venture infrastructure companies CTIL (Vodafone + O2) and MBNL (Three + EE / BT) operate parallel yet subtly different siteshare businesses, and operate more than half the UK’s ~40,000 active towers. Each has different models of sharing and asset ownership. CTIL and MBNL each has around 20,000 sites, around two thirds of which are their own, the rest co-located on a variety of independent towers. The UK’s leading independent towerco Arqiva has 10,550 towers, Wireless Infrastructure Group has 2,000, Shere Group 500, and a variety of smaller towercos and other stakeholders make up the other ~1,450 sites.