$NBG is one of biggest losers #stocks today. read more:

Natl Bk Greece American Deposit (symbol: NBG) was one of the worst losers
of the trading day today (2015-08-24), losing -14.1758%. The number of
shares that changed hands was 18,481,839, or about 1 times the average
daily volume in the stock.
The closing price was $0.6248, amounting to a market cap of $2,210,000,000,
about -83.0678% off the highest price in the last 12 months. The stock has
been trading at a range between $0.56 and $3.69.
NBG is in the Commercial Banks industry, part of the Finance sector.