Wednesday 01 Jan New Year's Day
Thursday 17 Apr Holy Thursday
Friday 18 Apr Good Friday
Monday 21 Apr Easter Monday
Friday 16 May General Prayer Day
Thursday 29 May Ascension Day
Friday 30 May Day after Ascension
Thursday 05 Jun Constitution Day
Monday 09 Jun Whit Monday
Wednesday 24 Dec Christmas Eve
Thursday 25 Dec Christmas Day
Friday 26 Dec Christmas Holiday
Wednesday 31 Dec New Year's Eve
Source: http://www.six-swiss-exchange.com/shares/trading/trading_calendar/