$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 (2016-08-08), losing -7.89%. The number of shares that
changed hands was 314,762, or about 1 times the average daily volume in the
stock.
The closing price was $30.37, amounting to a market cap of $1,130,000,000,
about -40.29% off the highest price in the last 12 months. The stock has
been trading at a range between $20.0 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.