Marathon Oil Corporation (NYSE: MRO) is an integrated international energy company engaged in exploration and production; oil sands mining; integrated gas; and refining, marketing and transportation. Marathon, which is based in Houston, Texas, has operations in the United States, Angola, Canada, Equatorial Guinea, Indonesia, Iraqi Kurdistan Region, Libya, Norway, Poland and the United Kingdom. Marathon is the fourth largest United States-based integrated oil company and the nation\'s fifth largest refiner.