- M & A Metals Inc [DBA Interior Metals]
- M & S Machining Inc
- M & W United Services LLC
- M E I Research Corp.
- M-Tech Lab Inc
- M/W International, Inc.
- M2 Real Solutions, LLC [DBA AvenueWest Arizona]
- M3 Consulting Services, LLC
- M3 Development LLC
- Maceo Carter Investments, LLC [DBA Sterling Staffing]
- Machine Tools USA, Inc.
- MAD Trailer Leasing, LLC
- Madd Construction and Restoration LLC
- Madden Elevator Company
- Madison Cloud IT Solutions LLC
- Madison Worldwide Advertising, LLC
- Magellan Solutions USA Inc.
- Magnolia Americas, Inc
- Makpar Corporation
- Man-Machine Systems Assessment (MSA), Inc
- Management Marine Service Inc
- Management Worlds, Inc.
- Manufacturing Dynamics Co.
- Manufacturing Services, Inc.
- Marcus J Graphic Design LLC
- Marine Electric Systems, Inc.
- Maritime Defense Strategy LLC
- Mark USA Inc., The
- Market Probe International Inc
- Marli Enterprises LLC [DBA Graze Craze]
- Martin Solutions LLC
- MartinFederal Consulting, LLC
- Maryland Marketing Source, Inc.
- Maryland Reprographics, Inc.
- Maryland Sound International Holding Company, LLC
- Masketeers, LLC
- Mason, Inc
- Master Communications Group, Inc.
- Master End Estates LLC
- Materials Research & Design, Inc.
- Mathews Project Solutions LLC
- Mathison LLC
- Matrix New World Engineering, Land Surveying and Landscape Architecture, PC
- Matter Fabs Inc.
- Mavec Advisors, LLC
- MBI Construction Services, Inc.
- McAndrew Company, Inc.
- McCall Design Studio, Visual Communications/DMVISUAL, LLC
- MCE Building Solutions, LLC
- McGrath Communications Inc.
- MCI Diagnostic Center, LLC
- McMenamin Consulting Group LLC
- McNamara Dowling Ambrose LLC
- Meagher Emanuel Laks Goldberg & Liao, LLP
- MEC, Inc. [MEC Environmental]
- Med Writers LLC, The
- Med-Strategies, Inc.
- MedCare Staffing, Inc.
- Medgluv Inc
- Media Works, Ltd
- Mediastruction, LLC
- Medical Equipment Solutions, Corp.
- Medical House Supply Group Inc
- Medical Monofilament Manufacturing, LLC
- Medical Temporaries, Inc.
- Meeting Achievements, Inc
- MegAllie Construction Company, LLC
- Melling LLC
- Melwood Global Communications, LLC
- Mensch Mill & Lumber Corp.
- Mercodia, Inc.
- Mercurius Inc.
- Meridian Manufacturing, Inc
- Mesa Science Associates, Inc.
- Meta Logic Strategic Consulting, LLC
- Metro Contract Group, Inc.
- Metroplex Pharmacy Solutions, LLC
- Metrotalk Inc.
- Metrotec Inc
- Metuchen Capacitors Inc.
- MGR Professional Services, Inc.
- Miami Tribal Systems Integrators, LLC
- Michael Vahey LLC
- Microcvd Corporation
- Micron Inspection & Calibration Services, Inc.
- Mid Atlantic Contracting Services Inc
- Mid Star Lab, Inc.
- Mid-Atlantic Interpreting Group, Inc
- Mid-Cities Home Medical Delivery Service, LLC
- Mid-South General Contracting, Inc
- Mid-West Moving and Storage, Inc
- Midwest Office Furniture Inc
- Midwest UAS Technologies, LLC
- Miko, LLC
- MILCO Wire EDM, Inc.
- Mile High Shooting Accessories, LLC
- Miles Fuels LLC
- MillWeb LLC
- Milrich Virtual Professionals LLC
- Miltronics Inc
- MindPoint Group, LLC
- MindSpring Consulting, Inc.
- Minnesota Cold Storage LLC
- Mintz & Hoke Inc.
- Mirage Software, Inc.
- Miss Quality Logistics, LLC
- Missele Logistics, LLC
- Mission Solutions International, Ltd.
- MJW Corporation, Inc.
- ML Williams & N.E.M. L.A. Incorp.
- MMC Productions Inc
- MOBI Boot Camp Corp
- Mobile Medical Imaging LLC
- Mobile Power Solutions, Inc.
- Mobomo, LLC
- Mocha Partners, Inc.
- Modefi Corp
- Modthink, LLC
- mohawk 11 Inc
- Mohr Stamping, Inc.
- Mohso, LLC
- Montana Safety Aces LLC
- Montell Fabrication and Rebuild LLC
- Moor Electric, Inc.
- Moorers Mechanical Inc
- Moravec Labs, LLC [DBA Dymaptic]
- Morcom International, Inc.
- Moscamp, Inc [DBA Gulf Rim Navigation]
- Mount Farm Drainage, LLC
- Mountain States Biomedical Services INC
- Mountain West Consulting, LLC
- Moxcee Consulting Group LLC
- Mozelle Enterprises LLC
- MS Bioworks LLC
- MSL Housekeeping Services, LLC
- MTAC, Inc
- MTI Global Group LLC
- MTI Systems, Inc.
- Multi-Cleaning Services, Inc.
- MuniRem Environmental, LLC
- Murer Consultants, Inc
- Murphy Enterprises of Alabama, Inc.
- MustWin, LLC
- MWT Materials, Inc.
- MX Holdings LLC [DBA Matrix]
- My Limitless Growth, LLC
- My M&M Transport, LLC
- My Sun Grid, LLC
- MyConsultQ, LLC
- Myriad Greeyn LLC
- MyWingman, LLC