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

Seattle Genetics, Inc. (symbol: SGEN) was one of the worst losers of the
trading day today (2016-12-27), losing -15.36%. The number of shares that
changed hands was 5,492,536, or about 5 times the average daily volume in
the stock.
The closing price was $52.36, amounting to a market cap of $7,410,000,000,
about -30.52% off the highest price in the last 12 months. The stock has
been trading at a range between $26.02 and $75.36.
SGEN is in the Biotechnology: Biological Products (No Diagnostic
Substances) industry, part of the Health Care sector. It first went public
in 2001.