| Norwood Resources Ltd. | Canada |
Private
|
| Nostrum Oil & Gas Finance B.V. | Netherlands |
Private
|
| Nova Biosource Fuels, Inc | United States |
Private
|
| Nova Scotia Resources Limited | Canada |
Private
|
| NovaMarlim Petroleo SA | Brazil |
Private
|
| Novicourt Inc. | Canada |
Private
|
| Novoil OAO | Russia |
Private
|
| NSTAR Gas Company | United States |
Private
|
| Nuevo Energy Company | United States |
Private
|
| Nustar Pipeline Partners L.P. | United States |
Private
|
| Nuverra Environmental Solutions, Inc. | United States |
Private
|
| O.W. Bunker & Trading A/S | Denmark |
Private
|
| Oak Ridge Utility District | United States |
Private
|
| Oakridge Energy Inc | United States |
Private
|
| OASIS MIDSTREAM PARTNERS LP | United States |
Private
|
| Occidental Crude Sales, Inc (International) | United States |
Private
|
| Occidental Permian, Limited | United States |
Private
|
| Ocean Drilling & Exploration Co. | United States |
Private
|
| Ocean Rig 2 As | Norway |
Private
|
| Ocean Rig AS | Norway |
Private
|
| Ocean Rig Norway AS | Norway |
Private
|
| Ocean Rig UDW Inc. | Cyprus |
Private
|
| Oceanic Exploration Company | United States |
Private
|
| Oceanografia, S.A. de C.V. | Mexico |
Private
|
| Octel-Starreon Llc | United States |
Private
|
| Odebrecht Offshore Drilling Finance Limited | Cayman Islands |
Private
|
| Oil Investment Barbados Limited | Barbados |
Private
|
| Oil Search Limited | Australia |
Private
|
| Oilsands Quest Inc. | Canada |
Private
|
| Oiltanking Partners, L.P. | United States |
Private
|
| OKC-LP | United States |
Private
|
| Oklahoma Energy Corporation | United States |
Private
|
| Oman LNG LLC | Oman |
Private
|
| Omega Commercial Finance Corporation | United States |
Private
|
| OMNI Energy Services Corporation | United States |
Private
|
| Onco Petroleum Inc | Canada |
Private
|
| One Bryant Park LLC | United States |
Private
|
| ONGC Videsh Limited | India |
Private
|
| Online Energy Inc. | Canada |
Private
|
| Open Range Energy Corp. | Canada |
Private
|
| Ophir Energy Limited | United Kingdom |
Private
|
| Orbit Petroleum Inc | United States |
Private
|
| Orchard Petroleum Limited | Australia |
Private
|
| Orix Aviation Systems Ltd | Republic of Ireland |
Private
|
| ORLEN UNIPETROL AS | Czech Republic |
Private
|
| ORLEN Upstream Canada Ltd | Canada |
Private
|
| Orsted Salg & Service A/S | Denmark |
Private
|
| Oryx Energy Company | United States |
Private
|
| Oryx Southern Delaware Holdings LLC | United States |
Private
|
| Oslo Seismic Services, Inc. | United States |
Private
|
| Osprey Energy Ltd. | Canada |
Private
|
| Osum Oil Sands Corp. | Canada |
Private
|
| Oxbow Calcining LLC | United States |
Private
|
| Oxbow Energy Solutions B.V. | Netherlands |
Private
|
| OXY USA, Inc. | United States |
Private
|
| Oy Esso Ab | Finland |
Private
|
| PAA Natural Gas Storage, L.P. | United States |
Private
|
| Pacalta Resources Ltd. | Canada |
Private
|
| Pacific Energy Fuels Company | United States |
Private
|
| Pacific Energy Group LLC | United States |
Private
|
| Pacific Energy Partners L.P. | United States |
Private
|
| Pacific Energy Resources Ltd. | United States |
Private
|
| Pacific Enterprises | United States |
Private
|
| Pacific Power & Light Company | United States |
Private
|
| Pacific Stratus Energy Ltd | Canada |
Private
|
| Paco Integrated Energy, Inc | United States |
Private
|
| Palliser Oil & Gas Corp | Canada |
Private
|
| Pan Andean Resources plc | United Kingdom |
Private
|
| Panhandle Eastern Pipe Line Company, LP | United States |
Private
|
| Paragon Offshore Drilling LLC | United States |
Private
|
| Parallel Petroleum LLC | United States |
Private
|
| Paramo a.s. | Czech Republic |
Private
|
| Paramount Resources TEC Ltd | Canada |
Private
|
| Park Place Energy Corp. | United States |
Private
|
| Passport Energy Ltd. | Canada |
Private
|
| Patina Oil & Gas Corporation | United States |
Private
|
| PATRICK PETROLEUM CORPORATION OF MICHIGAN | United States |
Private
|
| Pauley Petroleum, Inc. | United States |
Private
|
| PDTI Holdings, LLC | United States |
Private
|
| Pebercan Inc. | Canada |
Private
|
| Pegasi Energy Resources Corp | United States |
Private
|
| Pegasus Oil & Gas Inc | Canada |
Private
|
| Pemex Exploracion y Produccion, E.P.S. | Mexico |
Private
|
| Pemex Finance Limited | Cayman Islands |
Private
|
| Pemopro SA de CV | Mexico |
Private
|
| Pennant Energy Inc. | Canada |
Private
|
| Pennzoil-Quaker State Company | United States |
Private
|
| Peoples Energy, LLC | United States |
Private
|
| Permenergo | Russia |
Private
|
| Permian Partners Limited | United States |
Private
|
| Peru LNG S.R.L. | Peru |
Private
|
| Petro Andina Resources Inc | Canada |
Private
|
| Petro One Energy Corp | Canada |
Private
|
| Petro Welt Technologies GmbH | Austria |
Private
|
| Petro-Canada | Canada |
Private
|
| Petroamerica Oil Corp. | Canada |
Private
|
| PetroBakken Exploration Ltd. | Canada |
Private
|
| Petrobras America Inc | United States |
Private
|
| Petrobras Energia Participaciones S.A | Argentina |
Private
|
| Petrobras Global Finance B.V | Netherlands |
Private
|
|
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