In September 2012, its subsidiary, Unit Petroleum Company, acquired certain oil and natural gas assets from Noble Energy (NBL), increasing its proved reserves 38% from year-end 2011, and sold certain of its Bakken properties.

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Among the largest underlying components of IEO, in trading today Noble Energy, Inc. ( NYSE: NBL) is up about 0.4%, Chesapeake Energy Corp. ( NYSE: CHK) is up about 0.8%, and Valero Energy Corp. ( NYSE: VLO) is higher by about 0.6%.

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Among the largest underlying components of IWR, in trading today Crown Castle International Corp ( NYSE: CCI) is off about 0.6%, Noble Energy, Inc. ( NYSE: NBL) is up about 0.7%, and PPG Industries, Inc. ( NYSE: PPG) is higher by about 1.9%.

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