The WATER SUPPLY & SEWERAGE COMPANY OF THESSALONIKI S.A., according to the provisions of L. 3556/2007 (article 3 (16), (bb) and article 21), in combination with the provision of art. 11 of the Capital Market's Committee (CMC) decision 1/434/3.7.2007, announces that Mr. Laskaridis Ioannis son of Leonidas, General Manager, proceeded on the 3/10/2007 in the sale of 200 common registered company's shares of total value of Euro 1.820.