BOULDER, Colo.--(BUSINESS WIRE)--Zayo Group Holdings, Inc. (NYSE: ZAYO) (“Zayo”) announced today the completion of its follow-on public offering of 21,850,000 shares of its common stock, consisting of 4,000,000 shares sold by the Company and 17,850,000 shares sold by the selling stockholders (including shares sold by the selling stockholders pursuant to the exercise in full of the underwriters’ option to purchase additional shares), at a price to the public of $27.35 per share. Zayo intends to