The Helsinki Stock Exchange saw its first transaction on October 7, 1912. From then it remained a "free form" financial association until in 1984 it was converted into a cooperative owned mostly by banks,traders, other companies and associations.
On April 1, 1990 trading was moved to a new digital system: HETI (Helsinki Stock Exchange Automated Trading and Information System, and in Finnish a rough backronym for "immediately"), which replaced the electro-mechanical trading board originally introduced back in 1935. HETI enabled remote traders to do transactions on equal terms with those in the trading room.
The cooperative changed to a limited liability company (Helsingin Arvopaperipörssi) in the fall of 1995 and merged with several clearing and stock deposit companies and associations at the beginning of 1997. During 1997 and 1998 the Stock Exchange bought both of the Finnish derivative exchanges and merged them with itself to become HEX. In November 1998 HEX merged with Arvopaperikeskus to form Helsinki Exchanges Group Plc, which then changed its name to HEX Plc in the spring of 2001. In 2001 and 2002 HEX acquired a majority share of the Tallinn Stock Exchange and the Riga Stock Exchange.
On 3 September 2003, HEX Plc merged with OM AB, owner of the Stockholm Stock Exchange, to become OM HEX. A year later, the company was renamed to OMX.
OMX Helsinki 25 (OMXH25) is a stock market index for the Helsinki Stock Exchange. It is a market value weighted index that consists of the 25 most-traded stock classes. OMXH25 is also known by its old name, HEX25. As of March 2006, there are two exchange-traded funds listed, both are index funds for the OMXH25 index.
On April 2006 the Stock Exchange announced the trading will be done in round lot sizes of one share starting from September 25 2006. Previously trading was done in round lot sizes that varied from listed company to company.
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