$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 (2016-06-09), losing -9.87%. The number of shares
that changed hands was 14,788,140, or about 1 times the average daily
volume in the stock.
The closing price was $3.38, amounting to a market cap of $1,690,000,000,
about -73.24% off the highest price in the last 12 months. The stock has
been trading at a range between $1.57 and $12.63.
SDRL is in the Oil & Gas Production industry, part of the Energy sector.