AMENDMENT NO. 3 TO CREDIT AGREEMENT

Execution Version

AMENDMENT NO. 3 TO CREDIT AGREEMENT, dated as of February 1, 2013 (this “Amendment”), is entered into by and among Zayo Group, LLC, a Delaware limited liability company (“Zayo Group”), Zayo Capital, Inc., a Delaware corporation (“Zayo Capital”; and together with Zayo Group, the “Borrowers”), SunTrust Bank, as revolving facility administrative agent (in such capacity, the “Revolving Facility Administrative Agent”) and as issuing bank (in such capacity, the “Issuing Bank”) and the undersigned revolving lenders (the “Consenting Lenders”).

WHEREAS, the Borrowers, certain subsidiaries thereof, the Revolving Facility Administrative Agent, Morgan Stanley Senior Funding, Inc., as term facility administrative agent (the “Term Facility Administrative Agent” and, together with the Revolving Facility Administrative Agent, the “Administrative Agents”), the other agents party thereto and the lenders party thereto (the “Lenders”) entered into that certain Credit Agreement, dated as of July 2, 2012 (as amended by that certain Amendment No. 1 to Credit Agreement, dated as of July 17, 2012, and that certain Amendment No. 2 to Credit Agreement, dated as of October 5, 2012, the “Credit Agreement”; capitalized terms not otherwise defined in this Amendment have the same meanings as specified in the Credit Agreement).

WHEREAS, the Borrowers, the Consenting Lenders, the Revolving Facility Administrative Agent and the Issuing Bank have agreed to amend the Credit Agreement as hereinafter set forth;

NOW, THEREFORE, in consideration of the premises and for other good and valuable consideration (the receipt and sufficiency of which are hereby acknowledged), the parties hereto hereby agree as follows:

SECTION 1. Amendments to Credit Agreement. Clause (ii) of the proviso to Section 2.15(a) of the Credit Agreement is, effective as of the date hereof and subject to the satisfaction of the conditions precedent set forth in Section 3, hereby amended by deleting the dollar amount “$500,000” and replacing it with the phrase “$50,000, or such lesser amount as shall be agreed by the Issuing Bank in its sole discretion,”.

SECTION 2. Reference to and Effect on the Loan Documents. On and after the Effective Date, each reference in the Credit Agreement to “this Agreement”, “hereunder”, “hereof” or words of like import referring to the Credit Agreement, and each reference in the other Loan Documents to “the Credit Agreement”, “thereunder”, “thereof” or words of like import referring to the “Credit Agreement”, shall mean and be a reference to the Credit Agreement, as amended by this Amendment.

(b) The Credit Agreement, as specifically amended by this Amendment, and the other Loan Documents are, and shall continue to be, in full force and effect, and are hereby in all respects ratified and confirmed.

(c) Except as expressly provided herein, the execution, delivery and effectiveness of this Amendment shall not operate as a waiver of any right, power or remedy of any Lender or the Administrative Agents under the Credit Agreement or any other Loan Document, nor shall it constitute a waiver of any provision of the Credit Agreement or any Loan Document.

SECTION 5. Costs and Expenses. The Borrowers agree that all reasonable out-of-pocket expenses incurred by the Administrative Agents in connection with the preparation, execution, delivery and administration, modification and amendment of this Amendment and the other instruments and documents to be delivered hereunder or in connection herewith (including, without limitation, the reasonable fees, charges and disbursements of counsel for the Administrative Agents), are expenses that the Borrowers are required to pay or reimburse pursuant to Section 11.2 of the Credit Agreement.

SECTION 6. Execution in Counterparts. This Amendment may be executed in one or more counterparts (and by different parties hereto in different counterparts), each of which shall be deemed an original, but all of which together shall constitute one and the same instrument. Delivery by telecopier or other electronic transmission of an executed counterpart of a signature page to this Amendment shall be effective as delivery of an original executed counterpart of this Amendment.

SECTION 7. GOVERNING LAW. THIS AMENDMENT SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAW OF THE STATE OF NEW YORK.

SECTION 8. WAIVER OF RIGHT OF TRIAL BY JURY. EACH PARTY TO THIS AMENDMENT HEREBY EXPRESSLY WAIVES ANY RIGHT TO TRIAL BY JURY OF ANY CLAIM, DEMAND, ACTION OR CAUSE OF ACTION ARISING UNDER THIS AMENDMENT, OR IN ANY WAY CONNECTED WITH OR RELATED OR INCIDENTAL TO THE DEALINGS OF THE PARTIES HERETO OR ANY OF THEM WITH RESPECT TO THE CREDIT AGREEMENT AS AMENDED HEREBY, OR THE TRANSACTIONS RELATED THERETO, IN EACH CASE WHETHER NOW EXISTING OR HEREAFTER ARISING, AND WHETHER FOUNDED IN CONTRACT OR TORT OR OTHERWISE; AND EACH PARTY HEREBY AGREES AND CONSENTS THAT ANY SUCH CLAIM, DEMAND, ACTION OR CAUSE OF ACTION SHALL BE DECIDED BY COURT TRIAL WITHOUT A JURY, AND THAT ANY PARTY TO THIS AGREEMENT MAY FILE AN ORIGINAL COUNTERPART OR A COPY OF THIS SECTION 8 WITH ANY COURT AS WRITTEN EVIDENCE OF THE CONSENT OF THE SIGNATORIES HERETO TO THE WAIVER OF THEIR RIGHT TO TRIAL BY JURY.