Warren Resources (Warren Resources) Total Operating Expense : $663.89 Mil (TTM As of Dec. 2015)

Warren Resources Inc was incorporated on June 12, 1990 as a Delaware corporation. The Company is an independent energy company engaged in the exploration, development and production of domestic onshore crude oil and gas reserves. The Company primarily on the exploration and development of its waterflood oil recovery properties in the Wilmington field within the Los Angeles Basin of California, and its coalbed methane, or CBM, natural gas properties located in the Rocky Mountain region. As of December 31, 2013, the company owned natural gas and oil leasehold interests in approximately 123,943 gross (93,350 net) acres, approximately 80% of which are undeveloped. The Washakie Basin is located in the southeast portion of the Greater Green River Basin in southwestern Wyoming and represents its largest acreage position. As of December 31, 2013, the company owned 113,227 gross (87,683 net) acres prospective for CBM development in this area, of which 69,221 net acres were undeveloped. Warren owns certain deep rights below a portion of the Atlantic Rim CBM Project, which include an approximate 71,000 net acre position that is potentially prospective for hydrocarbon production from the Niobrara Shale and other deep formations. The Company sells its oil and natural gas production to various purchasers in the areas where the oil and natural gas is produced. Its drilling, completion, production, re-entry and land operations are conducted, managed and supervised for the company through Warren E&P, Inc., its wholly owned subsidiary. The Companys operations are subject to a wide variety of stringent federal, state and local laws and regulations governing the exploration and production of oil and natural gas, including discharge of materials into the environment or otherwise relating to environmental protection.