Hellenic Exchanges S.A. Holding Share Buy-Back

Hellenic Exchanges S.A. Holding, Clearing, Settlement And Registry (the Company) informs investors that, based on §4 article 4 of the European Commission Regulation 2273/2003, and in implementation of the resolution of the Annual General Meeting of shareholders of the Company of 14.5.2008, it purchased own shares, as follows:

• On 13.6.2008 45,000 own shares were purchased, at an average price of euro 10.18 per share, and total transaction cost of euro 458.200,00
• On 18.6.2008 31,838 own shares were purchased, at an average price of euro 10.39 per share, and total transaction cost of euro 330,924.30
• On 19.6.2008 22,340 own shares were purchased, at an average price of euro 10.37 per share, and total transaction cost of euro 231,642.60
• On 20.6.2008 150,000 own shares were purchased, at an average price of euro 10.31 per share, and total transaction cost of euro 1,546,661.74

The transactions were done through the members of Athens Exchange Alpha Finance, Agricultural Bank of Greece Securities, Eurobank Securities and Midas Securities. Following the abovementioned purchases, the Company owns 279,178 own shares (0.40% of the total 70,485,563 shares outstanding).