Tuesday 01 Jan New Year's Day
Thursday 28 Mar Holy Thursday
Friday 29 Mar Good Friday
Monday 01 Apr Easter Monday
Friday 26 Apr General Prayer Day
Thursday 09 May Ascension Day
Friday 10 May Day after Ascension
Monday 20 May Whit Monday
Wednesday 05 Jun Constitution Day
Tuesday 24 Dec Christmas Eve
Wednesday 25 Dec Christmas Day
Thursday 26 Dec Christmas Holiday
Tuesday 31 Dec New Year's Eve
Source: http://www.nasdaqomxnordic.com/tradinghours/