IBM, in full International Business Machines Corporation, leading American computer manufacturer, with a major share of the market both in the United States and abroad. Its headquarters are in Armonk, New York. It was incorporated in 1911 as the Computing-Tabulating-Recording Company in a consolidation of three smaller companies that made punch-card tabulators and other office products. The company assumed its present name in 1924 under the leadership of Thomas Watson, a man of considerable marketing skill who became general manager in 1914 and had gained complete control of the firm by 1924. Watson built the then-floundering company into the leading