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

HELLENIC EXCHANGES - ATHENS STOCK EXCHANGE S.A.

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

MORGAN STANLEY informed the Company in writing on 14.05.2008 that on 8.5.2008 it purchased common registered shares with a voting right of HELLENIC EXCHANGES S.A. HOLDING CLEARING SETTLEMENT & REGISTRY (HELEX). Following the abovementioned transaction, MORGAN STANLEY indirectly holds 5.092% of the share capital of HELEX (from 4.970% before the transaction).