AnteroPressArkomaCloseJune2012

Denver, Colorado, July 2, 2012 – Antero Resources today announced that on June 29, 2012 it closed the previously announced sale of all of its exploration and production assets in the Arkoma Basin along with associated commodity hedges to Vanguard Natural Resources, LLC for $445 million in cash. After
adjusting for estimated income, expenses and capital costs related to the Arkoma Basin properties and associated commodity hedges from the April 1, 2012 effective date of the sale through June 29, 2012, gross proceeds at closing was $434 million, subject to final post-closing adjustments. The Company expects to recognize a noncash loss on the sale of the properties.