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

Delek US Holdings, Inc. (symbol: DK) was one of the biggest winners of the
trading day today (2016-08-12), gaining 10.14%. The number of shares that
changed hands was 5,247,777, or about 4.3 times the average daily volume in
the stock.
The closing price was $16.4, amounting to a market cap of $1,010,000,000,
about -54.39% off the highest price in the last 12 months. The stock has
been trading at a range between $11.41 and $35.96.
DK is in the Integrated oil Companies industry, part of the Energy sector.
It first went public in 2006.