declared by the Exchange in advance. Trading rules A special feature of Helsinki Exchange is that limit orders are not allowed to cross over. For an effective market order, the unfilled portion of the order becomes a limit order when it stays at the execution price. See also Stock market lists Nasdaq Copenhagen Nasdaq Stockholm Nasdaq Nordic Nasdaq Vilnius Nasdaq Riga Nasdaq Tallinn Nasdaq Iceland Nasdaq First North Other lists List of Finnish companies List of Ålandic companies References External links Nasdaq OMX Nordic homepage Companies listed on Nasdaq Helsinki Financial services companies established in 1912 1912 establishments in Finland Economy of Finland Buildings and structures in Helsinki Economy of Helsinki Stock exchanges in Europe Helsinki Nasdaq Nordic Financial services companies of Finland Kluuvi