$SWN is one of biggest winner #stocks today. read more:

Southwestern Energy Company (symbol: SWN) was one of the biggest winners of
the trading day today (2015-12-31), gaining 12.86%. The number of shares
that changed hands was 15,863,080, or about 0.9 times the average daily
volume in the stock.
The closing price was $7.11, amounting to a market cap of $2,720,000,000,
about -75.99% off the highest price in the last 12 months. The stock has
been trading at a range between $5.0 and $29.61.
SWN is in the Oil & Gas Production industry, part of the Energy sector.