- Madico
- Malema Flow Sensors
- Marchese & Associates, Inc.
- Master Meter, Inc.
- Materials Transportation Co.
- Maxim Crane Works
- McLaren Industries
- McLaren Industries, Inc.
- McLaren Industries (VOIDED)
- MDTablet
- Medisolve
- MJM Restarints
- M-P.A.C.T.
- Mac Tools, Inc.
- Mafi-Trench Corp.
- MAG InnoVision
- Magna Carta Companies
- MAGNA Securities Corporation
- Magsoft Corporation
- MAI
- Mail2World, Inc.
- Malema Flow Sensors
- Management Resource Group
- Mannkind Corporation
- Manning Management/Flying-In-Formation
- Maple Life Financial, Inc.
- Marathon Oil
- Marchese & Associates, Inc.
- Marketing Analytics, Inc.
- Market Partners, Inc.
- Marshall Goldsmith Partners
- Marshall House
- Mart Corporation
- Massachusetts Mutual Life Insurance Company
- MasTec, Inc.
- Mastercard International
- Master Meter, Inc.
- MasterPrivacy.com
- Matra Datavision
- Materia, Inc.
- Materials Transportation Co.
- Matthew D. Hutcheson, LLC
- Max Energy Savers, Inc.
- Maxim Crane Works
- Mazak Optonics Corp.
- MC2
- MCA, Inc.
- McCue Systems
- McDaniel Fire Systems
- McDean, Inc.
- McGough & Associates
- The McGraw-Hill Companies'
- McJunkin Corporation
- McLaren Industries, Inc.
- MCST Preferred Transportation
- MDTablet
- Mektech Composites
- Med Acct, Inc.
- Media 100
- Media Fusion L.L.C.
- Mediaflex Inc.
- Mediaplex, Inc.
- MediaSec Technologies
- Media Station, Inc.
- Medical Communications Systems, Inc.
- Mediconsult
- Medevac Group
- Medisolve
- Medispec
- MegaTribe Corporation
- Megola, Inc.
- Meissner Filtration Products, Inc.
- Membership Marketing
- Mendocino Software, Inc.
- Merchant Warehouse
- Mers
- MetaCreations
- Meta Payment Systems
- Metaserver, Inc.
- M.E. Taylor Engineering, Inc., Semicro Division
- Met-Chem Canada Inc.
- Metrex
- Metrobility Optical Systems, Inc.
- Metro One Telecommunications
- Michael Neill & Associates
- Michelin North America
- M&I Corporation
- Microbix Biosystems, Inc.
- Micro Focus
- MicroE, Inc.
- Microlog Corp.
- Micro-Media Solutions, Inc.
- Micro-Media Solutions, Inc.
- Micropoint / Flexpoint
- Microsensor Systems, Inc.
- MicroSignal Corporation
- Microvellum
- Microsoft Corporation
- Microsoft Corporation
- Microsoft(Security Capital Markets)
- Microwave Photonic Systems
- Midwest Energy Association
- Millennia Vision Corporation
- Millennium
- Milinx Business Group, Inc.
- Milmour Products, Inc.
- Mincom Inc.
- Mincom, Inc
- Mindjet
- Minefinders Corporation Ltd.
- Minerva Health
- Miranda Enterprises Holdings Corporation
- Mirror Image Internet
- MIS Labs
- Mississippi Lime Company
- Mitsubishi Electronics America
- Mitsubishi Corporation
- MJM Restraints
- Mobile Automation Inc.
- Mobile Communications Holdings, Inc.
- Mobile Computing Corporation
- Mobile P.E.T. Systems, Inc.
- Mobile Systems International
- MobileStar Network Corp.
- Mobile Systems Verification Corporation
- MobileWise Inc.
- Moby Wrap, Inc.
- Modus Media, Inc. Molycorp, Inc.
- Money Tree Services, Inc.
- Monterey Trading Group
- Montgomery Watson <harza.com>
- Morgan and Sampson
- Morning Star Molecular Imaging
- Motion Computing, Inc.
- Motorola
- Motorola Manufacturing
- M-P.A.C.T
- MPSI Systems, Inc.
- MSE Power Systems, Inc.
- MSO Medical
- MTI Lighting Specialist, Inc.
- MultiLink, Inc.
- MulitMedical Systems
- Myers, F.E.
- myNetsales.com
- The Myron L. Company