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

Seadrill Limited Ordinary Share (symbol: SDRL) was one of the worst losers
of the trading day today (2016-01-20), losing -11.79%. The number of shares
that changed hands was 17,107,673, or about 2 times the average daily
volume in the stock.
The closing price was $1.87, amounting to a market cap of $921,460,000,
about -87.89% off the highest price in the last 12 months. The stock has
been trading at a range between $1.6 and $15.44.
SDRL is in the Oil & Gas Production industry, part of the Energy sector.