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

Universal Display Corporation (symbol: OLED) was one of the worst losers of
the trading day today (2016-12-28), losing -5.62%. The number of shares
that changed hands was 795,223, or about 1 times the average daily volume
in the stock.
The closing price was $57.5, amounting to a market cap of $2,700,000,000,
about -22.7% off the highest price in the last 12 months. The stock has
been trading at a range between $40.44 and $74.39.
OLED is in the Electrical Products industry, part of the Capital Goods
sector.
Looking at its valuation, the stock is now trading at 69.03 times earnings.