Saudi Aramco is a Saudi Arabian national petroleum and natural gas company based in Dhahran, Saudi Arabia. It was founded in 1933 as the California-Arabian Standard Oil Company and was later renamed Aramco. Saudi Aramco is 100% owned by the Saudi government and is the world's largest oil producer and exporter. It operates both upstream, producing oil and gas, and downstream, refining, distributing, and marketing oil, gas, and petrochemical products. Saudi Aramco owns the world's second largest proven crude oil reserves and operates the largest single hydrocarbon network in the world.