O'Brien Energy Company
O'Brien Energy Resources Corp.
O'Brien Resources, LLC
O'Brien, Owen
O'Connell, James P.
O-K Gas Svcs
OCCIDENTAL ENERGY MARKETING, INC.
Ocean Energy, Resources, Inc.
OCFIW Oil Company, Inc.
Oil Company of America, Inc.
Oil Kings, a General Partnership
Oil Partners, LLC
Oil Producers, Inc. of Kansas
Oil Properties Co., Inc.
Oil Property Management, Inc.
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Oil Sources Corp.
Oil Tech Producers Corporation
Oilfield Services, LLC
Oilfield Truck Service
OLAK Energy Production, LLC
Olson-Anderson Lease
Olympic Oil, Inc.
One Source Financial Services Inc.
Onshore, L.L.C.
Oolite Energy Corp
OPCO LLC
Opdycke Lease Partners, a General Partnership
Orca Operating Company LLC
Osage Energy, LLC
OSAGE Resources, LLC
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Osborn Heirs Company, LTD
Outback Oil, Inc.
Outlaw Well Service LLC
Overland Exploration Company
Owen's Pumping Service
Owen, Matthew
Owens Oil
Owens Petroleum LLC
Owings Oil, LLC
Oxbow Oil Company,a Kansas General Partnership
OXY USA Inc.
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