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

OPKO Health Inc. Common Stock (symbol: OPK) was one of the worst losers of
the trading day today (2015-08-24), losing -13.92%. The number of shares
that changed hands was 14,402,164, or about 3 times the average daily
volume in the stock.
The closing price was $10.33, amounting to a market cap of $4,790,000,000,
about -46.2% off the highest price in the last 12 months. The stock has
been trading at a range between $8.02 and $19.2.
OPK is in the Major Pharmaceuticals industry, part of the Health Care
sector.