BP Plc operates as an integrated oil and gas company. It operates through the following segments: Upstream, Downstream and Rosneft. The Upstream segment engages in the oil and natural gas exploration, field development and production, midstream transportation, storage and processing, and marketing and trade of natural gas, including liquefied natural gas and power, and natural gas liquids. The Downstream segment refines, manufactures, markets, transports, supplies, and trades crude oil, petroleum, petrochemicals products and related services to wholesale and retail customers. The Rosneft segment engages in investment activities. The company was founded by William Knox D'Arcy on April 14, 1909 and is headquartered in London, the United Kingdom.