The Helsinki Stock Exchange (formerly OMX Helsinki, officially NASDAQ OMX Helsinki) is a stock exchange that is in Helsinki, Finland. The Helsinki Stock Exchange was first made in October 7, 1912 when they made their first transaction. After that they had remained a "free form" type of financial association until 1984. Then it changed to a cooperative owned mostly by banks, traders, other companies and associations. The stock exchange lists 141 businesses. 