Share Structure - under research as of April 7, 2016. Since NBG was delisted from the NYSE, no SEC filings have been submitted:
NBG Stock quote - Athens
Athens Stock Exchange is open from 3:26 AM to 10:05 AM Eastern Time
NBG A.S.E. - http://www.bloomberg.com/quote/ETE:GA
NBG GROUP RETAIL AND BUSINESS
The Bank: National Bank of Greece, the oldest and largest among Greek banks, heads the strongest financial group in the country. It boasts a dynamic profile internationally, particularly in Southeastern Europe and the Eastern Mediterranean.
Founded in 1841 as a commercial bank, NBG enjoyed the right to issue banknotes until the establishment of the Bank of Greece in 1928. It has been listed on the On the Athens Stock Exchange since the latter's foundation in 1880. From October 1999 to November 2015, the Bank was listed on the NYSE, abd now trades on the OTC Markets under ticker symbol NBGGY.
National Bank of Greece Wikipedia entry