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Moody's changed its deposit rating on Greek banks Alpha, Eurobank and National to positive from stable, citing expectations of further improvement in asset quality, the ratings agency said on Tuesday.
Moody's said stronger than 2 percent annual economic growth in the coming years would support banks' efforts to reduce their large stock of sour loans.
A mixed session at the bourse on Friday brought the first post-election week to a close with losses for the benchmark, while the market also used some of its cash availability to cover the bond issue by National Bank.
The Athens Exchange (ATHEX) general index closed at 858.33 points, shedding 0.58 percent from Thursday's 863.33 points. On a weekly basis it shrank 4.06 percent.
The Greek stock market recovered on Wednesday from a two-day sell-off that saw banks shed over 12 percent of their stock value, as the benchmark jumped back above the 860-point level, albeit on lower trading volume. The market appears quite volatile, in contrast to the months leading up to the May 26 European elections.
European slaps on Athens' wrist over handouts by the previous government that are seen endangering the budget's targets, inflicted extensive losses on Greek stocks on Tuesday, and came hand-in-hand with a rise in Greek bond yields. Sazka's public offering for OPAP shares it does not own did not help prices either.