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

Halozyme Therapeutics, Inc. (symbol: HALO) was one of the worst losers of
the trading day today (2016-01-13), losing -17.68%. The number of shares
that changed hands was 3,341,555, or about 3 times the average daily volume
in the stock.
The closing price was $10.06, amounting to a market cap of $1,280,000,000,
about -60.16% off the highest price in the last 12 months. The stock has
been trading at a range between $10.02 and $25.25.
HALO is in the Biotechnology: Biological Products (No Diagnostic
Substances) industry, part of the Health Care sector.