(4) Long‑term Debt

(a)Midstream Credit Facility

Prior to the IPO on November 10, 2014, long-term debt represented amounts outstanding under a credit facility agreement between Midstream Operating, then a wholly owned subsidiary of Antero and now a wholly owned subsidiary of the Partnership, and the lenders under Antero’s credit facility that were incurred for the acquisition of the Predecessor’s gathering and compression assets (the “midstream credit facility”). The facilities were ratably secured by mortgages on substantially all of Antero’s and Midstream Operating’s properties and guarantees from Antero and its restricted subsidiaries. Commitments under this facility were allocated from the borrowing base and commitment levels under the Antero facility. Interest on the facility was payable at a variable rate based on LIBOR plus a margin ranging from 1.50% to 2.50% or the prime rate plus a margin ranging from 0.50% to 1.50%, based on an election at the time of borrowing and on the borrowing base usage. Commitment fees on the unused portion of the credit facility were due quarterly at rates from 0.375% to 0.50% of the unused facility.

On November 10, 2014, in connection with the completion of the IPO, the outstanding balance of $510 million that related to gathering and compression assets was repaid out of the proceeds of the IPO, and this facility was assumed by Antero.

(b)Revolving Credit Facility

On November 10, 2014, in connection with the closing of the IPO, the Partnership entered into a revolving credit facility with a syndicate of lenders. The revolving credit facility provides for lender commitments of $1.0 billion and for a letter of credit sublimit of $150 million. At December 31, 2014, we had no of borrowings and no letters of credit outstanding under the revolving credit facility. The revolving credit facility will mature on November 10, 2019.

Principal amounts borrowed are payable on the maturity date with such borrowings bearing interest that is payable quarterly. The Partnership has a choice of borrowing in Eurodollars or at the base rate. Eurodollar loans bear interest at a rate per annum equal to the LIBOR Rate administered by the Intercontinental Exchange (“ICE”) Benchmark Administration for one, two, three, six or twelve months plus an applicable margin ranging from 150 to 225 basis points, depending on the leverage ratio then in effect. Base rate loans bear interest at a rate per annum equal to the greatest of (i) the agent bank’s reference rate, (ii) the federal funds effective rate plus 50 basis points and (iii) the rate for one month Eurodollar loans plus 100 basis points, plus an applicable margin ranging from 50 to 125 basis points, depending on the leverage ratio then in effect.

The revolving credit facility is secured by mortgages on substantially all of our and our restricted subsidiaries’ properties and guarantees from our restricted subsidiaries. The revolving credit facility contains restrictive covenants that may limit our ability to, among other things:

incur additional indebtedness;

sell assets;

make loans to others;

make investments;

enter into mergers;

make certain restricted payments;

incur liens; and

engage in certain other transactions without the prior consent of the lenders.

Borrowings under the revolving credit facility also require the Partnership to maintain the following financial ratios:

an interest coverage ratio, which is the ratio of the Partnership’s consolidated EBITDA to its consolidated current interest charges of at least 2.5 to 1.0 at the end of each fiscal quarter; provided that upon obtaining an investment grade rating, the borrower may elect not to be subject to such ratio;

a consolidated total leverage ratio, which is the ratio of consolidated debt to consolidated EBITDA, of not more than 5.0 to 1.0; provided that after electing to issue unsecured high yield notes, the consolidated total leverage ratio will not be more than 5.25 to 1.0, or, following the election of the borrower for two fiscal quarters after a material acquisition, 5.50 to 1.0; and

if the Partnership elects to issue unsecured high yield notes, a consolidated senior secured leverage ratio, which is the ratio of consolidated senior secured debt to consolidated EBITDA, of not more than 3.75 to 1.0.