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

Questar Corporation (symbol: STR) was one of the biggest winners of the
trading day today (2016-02-01), gaining 22.56%. The number of shares that
changed hands was 20,931,756, or about 12.4 times the average daily volume
in the stock.
The closing price was $24.99, amounting to a market cap of $4,370,000,000,
about -5.0% off the highest price in the last 12 months. The stock has been
trading at a range between $18.02 and $26.31.
STR is in the Oil & Gas Production industry, part of the Public Utilities
sector.
Looking at its valuation, the stock is now trading at 19.99 times earnings.