Shell Oil Company is an American subsidiary of Royal Dutch Shell, a multinational oil company which stands as one of the largest oil companies on the planet. In the United States, Shell employs approximately 22,000 people and is based out of Houston, Texas. They are one of America's largest natural gas and oil marketers, natural gas produces and petrochemical manufacturers. With around 25,000 Shell-branded gas stations all across the United States, they are considered widely as a market leader. Shell products include fuel, oil, and car services alongside production, refining and exploration of petroleum-based products.