M

M G Trade Finance Corp.
Macquarie Bank Ltd.
Magellan Exploration LLC.
Magnum Hunter Production Inc.
Maissen Trade Ltd.
Malka Oil AB.
Marathon Oil Co.
Mariner Energy Inc.
Mariposa Pipeline Co.
Mark Resources Corp.
Markton Ltd.
Marquis Oil & Gas Inc.
Marubeni Oil & Gas Inc.
Matrix Las Cienegas LP.
Matrix Partners Inc.
Maverick Energy Inc.
Maxim Petroleum Corp.
Maxx Petroleum Ltd.
Mayo Foundation Treasury Services
Mc Clure Enterprises
Mc Coy Exploration Co.
McAllister Maritime LLC.
McClure Enterprises
McCord Production Co.
McDonald Investments Inc.
McGowen Resources Co.
MCN Energy Inc.
MCR LLC.
Medallion Exploration
Merak
Mercury Exploration Inc.
Meridian Resources Corp.
Meritage Energy Co. LLC.
Metalmark Capital LLC.
Mexia Producing Co.
Michigan Consolidated Gas Co.
Mid-Con Energy Corp.
Midcon Offshore Inc.
Midfirst Bank
Midwest Energy Cos. Inc.
Milagro Exploration
Millenium Offshore Group
Mineral Development Inc.
Minerex
Mission Energy Co.
Mission Oil Corp.
Mississippi Chemcal Corp.
Mitenergy Upstream LLC.
Mitsui
Mobil Exploration and Development
Monclova Pirineo Gas (MPG)
Mont Blanc Resources Inc.
Monterey Resources Inc.
Moose Oil & Gas Co.
Moreno International LLC.
Morgan Stanley
Morse Resources Inc.
Motor City Four LLC.
Mountain Oil & Gas Co.
MS Gas Resources
MSC Exploration LP.
Municipal Energy Resources Corp.
Murex Petroleum Corp.
Murphy Oil Corp.
Mustang Fuel Corp.
Machii-Ross Petroleum Co.
Maersk Energy Inc.
Magnolia Methane Corp.
Main Energy Inc.
Makoil Inc.
Mallon Oil Co.
Mariah Energy
Marion Energy Inc.
Maritech Resources Inc.
Marks Oil Co.
Marlin Energy LLC.
Marshall Oman Exploration Inc.
Matagorda Operating Co.
Matrix Oil Corp.
Matrix Production Co.
Max Petroleum PLC.
Maxwell Petroleum Inc.
Mayer Ventures
Mc Allister Maritime LLC.
Mc Clymond Ltd. Oil & Gas
Mc Gowen Resources Co.
McCartney Engineering Inc.
McCord Development Inc.
McCoy Enterprises
McGhee Exploration & Production
McMoRan Oil & Gas Co.
MCNIC Oil & Gas Co.
MCX Exploration (USA) Ltd.
Medicine Bow Energy Corp.
Mercantile International Petroleum
Merex Oil Co. LLC.
Merit Energy
Merrill Lynch
Metfuel Wyoming
MI Energy Corp.
Mid Louisiana Gas Co.
Mid-Power Service Corp.
Middle Bay Oil Co.
Midstates Petroleum Corp.
Midwest United Energy LLC.
Millenium Drilling Co. Inc.
Miller Oil & Gas Assets LLC.
Minerals Management Service
Miocene Oil Co. LLC.
Mission First Financial
Mission Resources Corp.
Mistral Capital Inc.
Mitsubishi Corp.
MJM Oil & Gas Inc.
Momentum Operating Co. Inc.
Monforte Exploration LLC.
Montason Technologies Inc.
Monument Resources Inc.
Morenergy Exploration Co.
Morgan Energy Corp.
Morrow, Morrow, Ryan and Bassett
Mosbacher Energy Co.
Mountain Gas Resources Inc.
Mountaineer Gas Services
MS Oil Co.
Mullens Investment Ltd. Partnership
Municipal Gas Authority of Georgia
Murphy Exploration and Production Co.
Mustang Drilling Ltd.