S&P Global Ratings on Tuesday raised its long and short term issuer credit ratings on four Greek banks, Alpha Bank, Eurobank Ergasias, National Bank of Greece, and Piraeus Bank to 'B-/B' from 'CCC+/C' and said the outlook on them is stable.

Moody's global credit rating firm upgraded Greece regarding twenty notes, while confirming one and analyzing another for an improved grade, concerning nine Hellenic structured finance transactions.