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

Ophthotech Corporation (symbol: OPHT) was one of the worst losers of the
trading day today (2016-03-30), losing -6.07%. The number of shares that
changed hands was 684,915, or about 1 times the average daily volume in the
stock.
The closing price was $41.0, amounting to a market cap of $1,450,000,000,
about -48.75% off the highest price in the last 12 months. The stock has
been trading at a range between $35.72 and $80.0.
OPHT is in the Major Pharmaceuticals industry, part of the Health Care
sector. It first went public in 2013.