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 27.12.2007 that on 20.12.2007 it purchased common registered shares with a voting right of HELLENIC EXCHANGES S.A. HOLDING CLEARING SETTLEMENT & REGISTRY (HELEX). Following the abovementioned purchase, MORGAN STANLEY owns indirectly 5.02% of the share capital of HELEX.