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

Sarepta Therapeutics, Inc. (symbol: SRPT) was one of the worst losers of
the trading day today (2016-01-18), losing -54.85%. The number of shares
that changed hands was 17,601,738, or about 10 times the average daily
volume in the stock.
The closing price was $14.28, amounting to a market cap of $646,470,000,
about -65.98% off the highest price in the last 12 months. The stock has
been trading at a range between $11.42 and $41.97.
SRPT is in the Major Pharmaceuticals industry, part of the Health Care
sector.