Exxon Mobil Corporation is a leading international energy company whose subsidiaries have operations in approximately 200 countries and territories. In the United States, ExxonMobil has significant exploration and production, refining and marketing and chemicals operations. ExxonMobil is one of the largest oil and gas producers and reserve holders in the United States, with a portfolio including Alaska, onshore Gulf Coast and deepwater Gulf of Mexico. In addition, there are approximately 16,000 Exxon and Mobil branded service stations in the U.S., as well as seven refineries, four of which are integrated petrochemical facilities.