Story updated at 9:50 a.m. to reflect market activity.
Athlon Energy gained 0.7% to $41.86 in morning trading.
Citigroup analysts said the upgrade was a valuation call based on a higher $54 price target for the oil and gas company.Must read: Warren Buffett's 25 Favorite Stocks STOCKS TO BUY: TheStreet Quant Ratings has identified a handful of stocks that can potentially TRIPLE in the next 12 months. Learn more. STOCKS TO BUY: TheStreet Quant Ratings has identified a handful of stocks that can potentially TRIPLE in the next 12 months. Learn more.
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