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- Mariottini, INC.
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- Marke Plumbing INC.
- Markgraf's Heating & A/c LLC
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- Marklund Charities
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- Martin Enterprises Heating & Air Coditioning, INC.
- Martin Mechanical Corporation
- Martin Petersen Company, INC.
- Martin Sahuri
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- Martinez Underground, INC.
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- Marvin Lewis Stormer
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- Masonry One, INC.
- Massage Envy - Chicago South Loop
- Master Distributors
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- Master Temp LLC
- Masters Kitchen And Bath
- Masters Property Maintenance, LLC
- Mastership Construction
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- Materialize
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- Matias Trucking, INC.
- Matsu Shita Japanese Restaurant, INC. DBA Makoto
- Matt And Ba LLC
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- Matteo Construction Company
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- Maury Cobb, Attorney At Law, LLC
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- Max William Ryan
- Maximo Constructions
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- Maxine Barrow
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- Maxwell Street Depot INC.
- Maxx Contractors Co
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- Maya Charyyeva
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- Mbe Fence, INC
- Mbp Heat N Ac
- Mc2
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- Mccann Window & Exteriors
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- Mcdonough Mechanical Services, INC.
- Mcguire_& Sons
- Mch Refrigeration INC
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- Mcinerney Builders, INC.
- Mckenzie Alexa Christian
- Mclane Midwest INC
- Mclemore's Heating & Cooling
- Mcmaster Painting And Decorating, INC.
- Mcoa
- Mcr Heating And Cooling, Incorporated
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- Mdb Mechanical INC.
- Mdi Electrical Construction INC.
- Mdi Transportation Systems, INC.
- Meade Electric Company, INC.
- Meade Heating, INC.
- Meaghan Collins
- Meccon Industries INC.
- Meccor Ind LTD
- Mechanical 24, INC.
- Mechanical Brothers Co.
- Mechanical Concepts Of Illinois, INC
- Mechanical Concepts, INC.
- Mechanical Management & Design Solutions, INC.
- Mechanical Service Industries INC.
- Mechanical Standard International, INC
- Mechtech Hvac Corp.
- Medallion Construction
- Medical Business Bureau LLC
- Medicredit, INC
- Medina's Heating & Air Conditioning INC.
- Mediterranean Stop
- Mee & Tees
- Mee INC
- Meet Your Freaks LLC
- Meg Security Video System INC.
- Mega Refrigeration INC
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- Mel's Cleaning
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