UK tower company Cornerstone has seen another slice of ownership sold off by a founding member. This time, Virgin Media O2 (VMO2) is selling around an 8% stake in the UK’s largest tower company to infrastructure investor Equitix. Cornerstone representatives at the recent Connected Britain event emphasized the new avenues for development available to the towerco, as it becomes less beholden to MNO ownership. VMO2’s sell-off is part of a predictable trend, set in motion since 2019, when the two founding members, Vodafone and VMO2, started selling off their holdings in the business. Last October, VMO2 sold a nearly 17% stake in Cornerstone to a partnership of UK pension funds called GLIL Infrastructure for around £360 million. Vodafone’s holding in…