ABB Ltd is a Swiss/Swedish multinational electrical engineering corporation headquartered in Zurich, Switzerland. Owing to its history, it is dual-listed on the SIX Swiss Exchange in Zurich and the Nasdaq Nordic exchange in Stockholm, Sweden, in addition to OTC Markets Group's pink sheets in the United States. It was ranked 340th in the Fortune Global 500 list of 2020 and has been a global Fortune 500 company for 24 years. ABB was formed in 1988 when Sweden's Allmänna Svenska Elektriska Aktiebolaget and Switzerland's Brown, Boveri & Cie merged to create Asea Brown Boveri, later simplified to the initials ABB. Both companies were established in the late 1800s and grew into major electrical equipment manufacturers, a business in which ABB remains active. Its traditional core activities include power generation, transmission and distribution; industrial automation, and robotics. Between 1989 and 1999, the company was also active in the rolling stock manufacturing sector. Throughout the 1990s and 2000s, ABB acquired hundreds of other companies, often in central and eastern Europe, as well as in Asia and North America. On occasion, the company's operations have encountered controversy. Wikipedia