Wednesday 01 Jan New Year's Day
Monday 06 Jan Epiphany
Friday 18 Apr Good Friday
Monday 21 Apr Easter Monday
Thursday 01 May May Day
Thursday 29 May Ascension Day
Friday 20 Jun Midsummer's Eve
Wednesday 24 Dec Christmas Eve
Thursday 25 Dec Christmas Day
Friday 26 Dec Boxing Day
Wednesday 31 Dec New Year's Eve
Source: http://www.nasdaqomxnordic.com/tradinghours