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

Anacor Pharmaceuticals, Inc. (symbol: ANAC) was one of the worst losers of
the trading day today (2015-10-20), losing -13.91%. The number of shares
that changed hands was 1,427,595, or about 2 times the average daily volume
in the stock.
The closing price was $92.42, amounting to a market cap of $4,070,000,000,
about -41.11% off the highest price in the last 12 months. The stock has
been trading at a range between $27.16 and $156.93.
ANAC is in the Major Pharmaceuticals industry, part of the Health Care
sector. It first went public in 2010.