Zayo 10-Q 2015 Q3 Quarterly report

Exhibit 32.2

CERTIFICATION OF CHIEF FINANCIAL OFFICER

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Zayo Group Holdings, Inc. (the “Company”) on Form 10-Q for three months ended March 31, 2015 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Ken desGarennes, Chief Financial Officer of the Company, certify, pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002, that:

(1) The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date:	May 13, 2015	By:	/s/ Ken desGarennes
			Ken desGarennes
			Chief Financial Officer