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Royal Dutch Shell Plc (5 rigs)
Eni SpA (3)
Marathon Oil Corp. (3)
Anadarko Petroleum Corp. (3)
Statoil ASA (2)
Chevron Corp. (2)
Noble Corp. (2)
Devon Energy Corp. (2)
BP Plc (2)
BHP Billiton Ltd. (2)
Hess Corp. (1)
LLOG Exploration Co. (1)
Walter Energy Inc. (1)
Petroleo Brasileiro SA (1)
ATP Oil & Gas Corp. (1)
Newfield Exploration Co. (1)
Nexen Inc. (1)
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