Founded in 1852 and owned and operated as a subsidiary of the TMX Group, the TSX (Toronto Stock Exchange) is the most important stock exchange in Canada. Until 2001, the TSX was known as the TSE. History of TSX: Canadian exchanges have customarily been home to the securities of several natural resource & finance firms. The Toronto Stock Exchange is the 3 rd largest stock exchange in North America in terms of capitalization, after the NYSE (New York Stock Exchange) and the Nasdaq. Also, TSX is the largest exchange in the globe by the number of listed securities. In 2009, Toronto Stock Exchange merged with the Montreal Stock Exchange. To imitate ownership of both exchanges, the parent company, TSX Group, became TMX Group. What are the listed companies on the TSX? More than 1,500 companies are indexed on the Toronto Stock Exchange. Among the largest are the Canadian National Railway, Suncor Energy (Canada's largest energy company), and the Royal Bank of Cana