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

Marathon Oil Corporation Common (symbol: MRO) was one of the worst losers
of the trading day today (2016-08-22), losing -6.9%. The number of shares
that changed hands was 26,331,909, or about 1 times the average daily
volume in the stock.
The closing price was $15.64, amounting to a market cap of $13,250,000,000,
about -23.48% off the highest price in the last 12 months. The stock has
been trading at a range between $6.52 and $20.44.
MRO is in the Oil & Gas Production industry, part of the Energy sector.