The WATER SUPPLY AND SEWERAGE COMPANY OF THESSALONIKI S.A. announces that the Yearly Briefing of Analysts will take place on Thursday 4th of June 2009, at the Stock Exchange of Thessaloniki, 16-18, Katouni street, at 11:00 a.m. instead of Wednesday June 3rd 2009 as it was announced at the itinerary for scheduled company actions 2009.