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

Marathon Petroleum Corporation (symbol: MPC) was one of the worst losers of
the trading day today (2016-07-06), losing -5.88%. The number of shares
that changed hands was 10,528,419, or about 2 times the average daily
volume in the stock.
The closing price was $36.5, amounting to a market cap of $19,340,000,000,
about -39.55% off the highest price in the last 12 months. The stock has
been trading at a range between $29.24 and $60.38.
MPC is in the Integrated oil Companies industry, part of the Energy sector.
Looking at its valuation, the stock is now trading at 9.99 times earnings.