$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 (2016-09-30), losing -4.82%. The number of shares
that changed hands was 14,192,397, or about 2 times the average daily
volume in the stock.
The closing price was $2.37, amounting to a market cap of $1,210,000,000,
about -70.11% off the highest price in the last 12 months. The stock has
been trading at a range between $1.57 and $7.93.
SDRL is in the Oil & Gas Production industry, part of the Energy sector.