Tuesday 01 Jan New Year's Day
Friday 29 Mar Good Friday
Monday 01 Apr Easter Monday
Wednesday 01 May May Day
Thursday 09 May Ascension Day
Friday 21 Jun Midsummer's Eve
Friday 06 Dec Independence Day
Tuesday 24 Dec Christmas Eve
Wednesday 25 Dec Christmas Day
Thursday 26 Dec Boxing Day
Tuesday 31 Dec New Year's Eve
Source: http://www.nasdaqomxnordic.com/tradinghours/