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

Northwest Biotherapeutics, Inc. (symbol: NWBO) was one of the worst losers
of the trading day today (2015-08-21), losing -21.62%. The number of shares
that changed hands was 4,181,488, or about 6 times the average daily volume
in the stock.
The closing price was $6.96, amounting to a market cap of $544,060,000,
about -44.54% off the highest price in the last 12 months. The stock has
been trading at a range between $3.79 and $12.55.
NWBO is in the Major Pharmaceuticals industry, part of the Health Care
sector. It first went public in 2012.