Mon May 20, 2013 12:31pm EDT
(The following statement was released by the rating agency) LONDON, May 20 (Fitch) Fitch Ratings has upgraded National Bank of Greece's (NBG, 'B-'/Stable/'B'), Piraeus Bank's (Piraeus, 'B-'/Stable/'B'), Alpha Bank's (Alpha, 'B-'/Stable/'B') and Eurobank Ergasias' (Eurobank, ...