• American Standard Energy Corp.
• HK eBus Corp
• Rockies Region Private LP
• Seadrill
• Reef Global Energy VIII, L.P.
• Fortem Resources Inc
• Reef Global Energy IX, L.P.
• Sterling Oil & Gas CO
• Erin Energy Corp.
• Samson Oil & Gas LTD
• Reef 2007-2009 Drilling Program
• Vantage Drilling CO
• Westland Resources, Corp.
• Horsepower Holdings, Inc.
• GulfStar Energy Corp
• Key Energy Services (Mexico), LLC
• Key Energy Pressure Pumping Services, LLC
• Key Energy Fishing & Rental Services, LLC
• Key Electric Wireline Services, LLC
• Misr Key Energy Investments, LLC
• Key Marine Services, LLC
• Key Energy Shared Services, LLC
• Key Energy Services, LLC
• Key Energy Services Mexico, Inc.
• Blaze Energy Corp.
• Octagon 88 Resources, Inc.
• Ocean Rig UDW Inc.
• Transocean Ltd
• Seahawk Drilling, Inc.
• Weatherford International Ltd./Switzerland
• Noble Corp
• Vantage International Management Pte Ltd.
• Vantage International Payroll Co.
• Vantage International Management Co.
• Vantage Drilling Netherlands B.V.
• Vantage Holding Hungary Kft
• Vantage Driller II Co.
• Vantage Driller III Co.
• Vantage Driller IV Co.
• TITANIUM EXPLORER Co
• TOPAZ DRILLER Co
• VANTAGE DEEPWATER Co
• Vantage Driller I Co.
• Vantage Drilling International Ltd.
• SAPPHIRE DRILLER Co
• PLATINUM EXPLORER Co
• COBALT EXPLORER Co
• EMERALD DRILLER Co
• AQUAMARINE DRILLER Co
• Ensco UK

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