Notification about a significant change in the number of voting rights (Law 3556/2007)

6 November 2008 - Hellenic Exchanges informs investors that, in implementation of the share buy back program approved by the Annual General Meeting of 14.5.2008, it purchased on 6.10.2008 51,000 common registered shares with a voting right of HELLENIC EXCHANGES S.A. HOLDING CLEARING SETTLEMENT & REGISTRY (HELEX).

Following the abovementioned transaction, HELEX holds 5.072% of its share capital (from 4.9996% before the transaction).