Story updated at 9:55 a.m. to reflect market activity.
Cobalt fell -1.7% to $18.21 in morning trading.
The firm reiterated its "buy" rating for the stock. The lower price target reflects higher capex for discovered resources according to UBS analysts.
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"Cobalt International Energy, Inc. independent, oil-focused exploration and production company with a salt prospect inventory in the deepwater of the United States Gulf of Mexico and offshore Angola and Gabon in West Africa. The Company operates its business in two geographic segments: the U.S. Gulf of Mexico and West Africa. The Company's oil-focused exploration efforts target subsalt Miocene and Inboard Lower Tertiary horizons in the deepwater U.S. Gulf of Mexico. As of December 31, 2012, it drilled as operator four exploratory wells in the deepwater U.S. Gulf of Mexico (North Platte #1, Ligurian #1 and #2, and Criollo #1) and participated as a non-operator in three exploratory wells (Heidelberg #1, Shenandoah #1 and Firefox #1) and three appraisal wells (Heidelberg #2, Heidelberg #3, and Shenandoah #2R). The Company's oil-focused exploration efforts target pre-salt horizons on Blocks 9, 20 and 21 offshore Angola and the Diaba Block offshore Gabon."