OMX AB (Aktiebolaget Optionsmäklarna/Helsinki Stock Exchange) is a financial services company. It was formed in 2003 through a merger between Swedish OM AB and Finnish HEX plc. OMX AB, through its Nordic Exchanges in Copenhagen, Stockholm, Helsinki, Riga, Tallinn, Vilnius and Iceland, offers trading in equities, derivatives services to listed companies and information services to financial markets players.