Moody's downgrade. https://m.moodys.com/mt/www.moodys.com/research/Moodys-downgrades-Greek-banks-senior-unsecured-debt-ratings-to-C--PR_333800?WT.mc_id=AMRG93X0pvbmVzX05ld3NSb29tX1NCX1JhdGluZyBOZXdzX0FsbF9Fbmc%3d20150904_PR_333800&un_jtt_redirect