The Unite States Steel Corporation (NYSE: X) is an integrated steel producer with major production operations in the United States and central Europe. The company is the world's seventh-largest steel producer ranked by sales (see list of steel producers). It was renamed USX Corporation in 1991 and subsequently United States Steel Corporation again in 2001 when the shareholders of USX spun off its steel-making assets following the acquisition of Marathon Oil in 1982. It is still the largest domestically owned integrated steel producer in the States, although it produces only slightly more steel than it did in 1902.