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

Vanguard Natural Resources LLC (symbol: VNR) was one of the worst losers of
the trading day today (2015-08-19), losing -13.83%. The number of shares
that changed hands was 1,909,831, or about 3 times the average daily volume
in the stock.
The closing price was $7.1, amounting to a market cap of $616,450,000,
about -76.53% off the highest price in the last 12 months. The stock has
been trading at a range between $6.9 and $30.25.
VNR is in the Oil & Gas Production industry, part of the Energy sector.