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

ZIOPHARM Oncology Inc (symbol: ZIOP) was one of the worst losers of the
trading day today (2015-09-28), losing -16.7%. The number of shares that
changed hands was 6,967,334, or about 2 times the average daily volume in
the stock.
The closing price was $9.13, amounting to a market cap of $1,180,000,000,
about -36.6% off the highest price in the last 12 months. The stock has
been trading at a range between $2.31 and $14.4.
ZIOP is in the Medical Specialities industry, part of the Health Care
sector.