$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 (2015-11-20), losing -49.1105%. The number of
shares that changed hands was 150,724,502, or about 14 times the average
daily volume in the stock.
The closing price was $0.1888, amounting to a market cap of $667,000,000,
about -92.5376% off the highest price in the last 12 months. The stock has
been trading at a range between $0.1569 and $2.53.
NBG is in the Commercial Banks industry, part of the Finance sector.