POSCO (formerly Pohang Iron and Steel Company) is a South Korean steel-making company headquartered in Pohang, South Korea. It had an output of 42,000,000 metric tons (41,000,000 long tons; 46,000,000 short tons) of crude steel in 2015, making it the world's sixth-largest steelmaker by this measure.[2] In 2010, it was the world's largest steel manufacturing company by market value.[3] Also, in 2012, it was named as the world's 146th-largest corporation by the Fortune Global 500. POSCO currently operates two integrated steel mills in South Korea, in Pohang and Gwangyang. POSCO previously operated a joint venture with U.S. Steel, USS-POSCO Industries, in Pittsburg, California, United States, but U.S. Steel acquired full ownership of the facility in February 2020.