GMX Resources Inc. (GMX) is an independent oil and natural gas exploration and production company with a portfolio of leasehold acreage in multiple resource plays. GMX is focused on the development of the hydrocarbon formations in East Texas including the Cotton Valley Sands layer in the Schuler formation and the Upper, Middle and Haynesville/Lower Bossier layers of the Bossier formation, in the Sabine Uplift of the Carthage, North Field primarily located in Harrison and Panola counties of East Texas. The Company has three subsidiaries: Diamond Blue Drilling Co., which owns three drilling rigs; Endeavor Pipeline Inc., which operates its water supply and salt water disposal systems in its East Texas area, and Endeavor Gathering, LLC, which owns the natural gas gathering system and related equipment operated by Endeavor Pipeline. Kinder Morgan Endeavor LLC owns 40% membership interest in Endeavor Gathering.