ABB is a multinational corporation headquartered in Zurich, Switzerland, operating mainly in robotics and the power and automation technology areas. It ranked 158th in the Forbes Ranking .ABB is one of the largest engineering companies as well as one of the largest conglomerates in the world. ABB has operations in around 100 countries, with approximately 140,000 employees in October 2015, and reported global revenue of $39.8 billion for 2014.ABB is traded on the SIX Swiss Exchange in Zürich, Nasdaq Stockholm and the New York Stock Exchange in the United States.ABB's Indian unit, ABB India Limited, is traded on the National Stock Exchange of India and on the Bombay Stock Exchange. The Indian subsidiary of ABB has a market capitalization of over $4 billion.HistoryABB resulted from the 1988 merger of the Swedish corporation Allmänna Svenska Elektriska Aktiebolaget (ASEA) and the Swiss company Brown, Boveri & Cie (BBC); the latter had absorbed the Maschinenfabrik Oerlikon in 1967. CEO at the time of the merger was the former CEO of ASEA, Percy Barnevik, who ran the company until 1996.