Zayo Group Holdings, Inc., or Zayo Group, is a publicly traded company headquartered in Boulder, Colorado, with European headquarters in London. The company provides communications infrastructure services, including fiber and bandwidth connectivity, colocation and cloud infrastructure. Zayo’s primary customer segments include data centers, wireless carriers, national carriers, ISPs, enterprises and government agencies. Zayo Group was built largely through acquisitions; it took over thirty companies from 2007 to 2014, including AboveNet and 360networks. An initial public offering of stock raised $600 million in 2014.