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

Enerplus Corporation Common Sto (symbol: ERF) was one of the worst losers
of the trading day today (2016-01-05), losing -7.93%. The number of shares
that changed hands was 1,057,881, or about 1 times the average daily volume
in the stock.
The closing price was $3.25, amounting to a market cap of $671,110,000,
about -75.3% off the highest price in the last 12 months. The stock has
been trading at a range between $3.01 and $13.16.
ERF is in the Oil & Gas Production industry, part of the Energy sector.