Friday 06 Jan Epiphany
Friday 06 Apr Good Friday
Monday 09 Apr Easter Monday
Tuesday 01 May Labour Day
Thursday 17 May Ascension
Friday 22 Jun Midsummer Eve
Thursday 06 Dec Independence Day
Monday 24 Dec Christmas Eve
Tuesday 25 Dec Christmas Day
Wednesday 26 Dec Boxing Day
Monday 31 Dec New Year Eve
Source: http://nordic.nasdaqomxtrader.com/trading/tradinghours/