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S& will be conducting routine maintenance Friday at 8pm through Sunday at 5pm, New York time and there will be no ratings updates from Friday at 8pm through Saturday at 6pm. Site performance may not be optimal during this time. We apologize for the inconvenience and thank you for your patience.

Corporates Rating List: Energy


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OAO AK Transneft
OAO Koks
Oasis Petroleum Inc.
Occidental Petroleum Corp.
Ocean Energy Inc.
Ocean Rig UDW Inc.
Oceaneering International Inc.
Oil and Natural Gas Corp. Ltd.
Oil Company Rosneft OJSC
Oleoducto Central, S.A. (OCENSA)
Overseas Shipholding Group Inc.