Day Date Month Holiday Friday 01 Jan New Year's Day Wednesday 06 Jan Epiphany Monday 14 Mar Ash Monday Friday 25 Mar National Holiday - Good Friday (Catholic) Monday 28 Mar Easter Monday (Catholic) Friday 29 Apr Good Friday Monday 02 May Easter Monday Tuesday 03 May Labour Day Holiday Monday 20 Jun Whit Monday Monday 15 Aug Assumption Day Friday 28 Oct National Holiday Monday 26 Dec Second Day of Christmas Source: http://www.helex.gr/web/guest/market-securities-holidays