Thursday 01 Jan New Year's Day
Tuesday 06 Jan Epiphany
Friday 03 Apr Good Friday
Monday 06 Apr Easter Monday
Friday 01 May Labour Day
Thursday 14 May Ascension Day
Friday 19 Jun Midsummer Eve
Thursday 24 Dec Christmas Eve
Friday 25 Dec Christmas Day
Thursday 31 Dec New Year's Eve
Source: http://www.nasdaqomxnordic.com/tradinghours