Posco, the English acronym for yenhen and Pohang steel, is a Korean steel company that produced about 42 million tonnes of raw steel in 2015 ranked fourth in the world's largest steel producers. In 2010, the company was the largest steel company in the world in terms of market value.the Posco Group was founded in 1968 by Park ta-yen-Joon. In 2012, the company was ranked 146th in the list of the world's Fortune 500. POSCO formed a for-profit partnership with Yoo.S. Steel has America in the United States the result of The USS-POSCO partnership which is concentrated in Pittsburgh, California.

The Central Office of the company POSCO in the city of Pohang., the South Korean is part of its shares in the stock markets of London Stock Exchange, the Tokyo Stock Exchange and the New York Stock Exchange Traded. Its biggest competitors are Tata Steel, Thyssen Krupp and NLMK.