New York, July 28, 2016 -- Moody's Investors Service (Moody's) upgraded Whiting Petroleum Corporation's (Whiting) Corporate Family Rating (CFR) to B3 from Caa1, its Probability of Default Rating (PDR) to B3-PD from Caa1-PD, its senior unsecured rating to Caa1 from Caa2, its senior subordinate rating to Caa2 from Caa3, and its Speculative Grade Liquidity (SGL) rating to SGL-2 from SGL-3. The rating outlook is stable.

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