Citigroup Upgrades Whiting Petroleum To Buy

Analysts at Citigroup upgraded Whiting Petroleum Corp WLL from Neutral to Buy. Whiting Petroleum shares have dropped 56.03 percent over the past 52 weeks, while the S&P 500 index has surged 7.12 percent in the same period. Whiting Petroleum shares climbed 2.24 percent to $36.00 in after-hours trading.