Companies starting with O.

82 oil & gas companies, each links to its full acquisition lineage and corporate successor.

O.E.I. Trust, The
O.E.I., L.L.C.
Oasis Petroleum
Occidental Oil and Gas Corp. USA
Occidental Petroleum Corp.
Ocean Drilling & Exploration
Ocean Energy Resources, Inc.
Ocean Energy, Inc.
Ocean Oil & Gas
Oceanic Oil
Ocelot Energy Inc.
Ocelot Oil Company
Ocotillo
ODECO
Odessa Exploration, Inc.
Odessa Natural Corporation
Odyssey Energy Inc.
Odyssey Oil and Gas Inc.
Offshore Energy Investments, Inc.
Ohio & Plymouth
Ohio Cities Gas Company
Ohio Oil Company
Oil & Gas Futures
Oil & Gas Properties Company
Oil Acquisitions, Inc.
Oil Development Company of Utah
Oil Investors, Inc.
OKC Limited Partnership
Oklahoma Acquisition Corp.
Oklahoma Basic Economy Corporation
Oklahoma Natural Gas Company
Oklahoma Oil Company
Okland Oil Company
Old Ben coal
Old Ocean Oil Company
Olds Petroleum Corporation
Oleum, Inc.
Oliver Resources, PLC
Olix Industries, Inc.
Olsen
Olsen & Jal
Olsen, Fred, Inc.
Olympia Energy Corp.
Olympia Energy Ventures, Ltd.
Olympic Resources, Ltd.
Omega - Smith Energy, Inc.
Omega Corporation
Omimex Resources, Inc.
Omni Exploration Inc.
Omni Petroleum Corporation
Omni Power Inc.
Onasco Companies, Inc.
ONEOK Exploration Co.
ONEOK Resources Company (Tulsa)
ONEOK, Inc.
Onshore Oil Corporation
Opinac Exploration, Ltd.
OPUBCO Energy Inc.
Ora Oil Company
Orbit Oil & Gas, Inc.
Orion Drillings Funds (various years)
Orlando Resources Ltd.
ORRI, Inc.
Oryx Energy Company
Osage Milestone Petroleum
Osca, Inc. (Lafayette)
Ottawa Energy, Inc.
Output Exploration, LLC (San Antonio)
Owl Petroleum Company
Owl Petroleum Company, Expl. & Prod.
Oxford Consolidated, Inc.
Oxford Exploration
Oxley Petroleum Co. (Tulsa)
Oxley, John C. Oil Producer
Oxoco Exploration Corp.
Oxoco Oil & Gas, Inc.
Oxoco Production Corp.
Oxoco-Texas, Inc.
Oxoco, Inc.
OXTEX, Inc.
Oxy Petroleum Inc.
OXY USA, Inc.