$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 (2016-11-28), losing -11.34%. The number of shares that
changed hands was 3,142,860, or about 4 times the average daily volume in
the stock.
The closing price was $34.54, amounting to a market cap of $1,230,000,000,
about -56.83% off the highest price in the last 12 months. The stock has
been trading at a range between $29.85 and $80.0.
OPHT is in the Major Pharmaceuticals industry, part of the Health Care
sector. It first went public in 2013.