Saudi Aramco, officially the Saudi Arabian Oil Company, is a majority state-owned petroleum and natural gas company, and the national oil company of Saudi Arabia. As of 2024, it is the fourth-largest company in the world by revenue and is headquartered in Dhahran. Saudi Aramco has both the world's largest proven crude oil reserves, at more than 270 billion barrels, and largest daily oil production of all oil-producing companies.