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

Omeros Corporation (symbol: OMER) was one of the worst losers of the
trading day today (2015-08-19), losing -10.03%. The number of shares that
changed hands was 5,514,597, or about 5 times the average daily volume in
the stock.
The closing price was $22.52, amounting to a market cap of $853,170,000,
about -25.5% off the highest price in the last 12 months. The stock has
been trading at a range between $11.18 and $30.23.
OMER is in the Major Pharmaceuticals industry, part of the Health Care
sector. It first went public in 2009.