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

Acceleron Pharma Inc. (symbol: XLRN) was one of the worst losers of the
trading day today (2016-11-30), losing -7.75%. The number of shares that
changed hands was 411,355, or about 1 times the average daily volume in the
stock.
The closing price was $33.69, amounting to a market cap of $1,270,000,000,
about -33.76% off the highest price in the last 12 months. The stock has
been trading at a range between $22.67 and $50.86.
XLRN is in the Biotechnology: Biological Products (No Diagnostic
Substances) industry, part of the Health Care sector. It first went public
in 2013.