X0306 4 2018-04-05 0 0001608249 Zayo Group Holdings, Inc. ZAYO 0001717324 Steinfort Matt 1821 30TH STREET, UNIT A BOULDER CO 80301 0 1 0 0 CFO Common Stock 2018-04-05 4 S 0 2230 36.39 D 7535 D Restricted Stock Units 2018-04-05 4 A 0 5450 0.00 A Common Stock 5450 5450 D The sale reported was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on November 9, 2017. The shares were sold in multiple transactions at the price reported. Each Part B restricted stock unit represents a contingent right to receive one share of Zayo Group Holdings, Inc. (the "Company") common stock. The reported number of restricted stock units assumes target level stock price performance. Upon vesting, the number of shares of common stock received by the reporting person will be determined based on the Company's historical stock price performance. The restricted stock units vest in full on June 28, 2019. /s/ Laura Littman, as attorney-in-fact 2018-04-09