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

Nabors Industries Ltd. (symbol: NBR) was one of the worst losers of the
trading day today (2016-02-01), losing -10.05%. The number of shares that
changed hands was 8,763,097, or about 1 times the average daily volume in
the stock.
The closing price was $6.62, amounting to a market cap of $2,190,000,000,
about -61.04% off the highest price in the last 12 months. The stock has
been trading at a range between $4.93 and $16.99.
NBR is in the Oil & Gas Production industry, part of the Energy sector.