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

Semgroup Corporation Class A Co (symbol: SEMG) was one of the worst losers
of the trading day today (2016-01-19), losing -14.28%. The number of shares
that changed hands was 1,464,611, or about 2 times the average daily volume
in the stock.
The closing price was $16.93, amounting to a market cap of $743,770,000,
about -80.54% off the highest price in the last 12 months. The stock has
been trading at a range between $16.87 and $86.99.
SEMG is in the Oilfield Services/Equipment industry, part of the Energy
sector.
Looking at its valuation, the stock is now trading at 19.66 times earnings.