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- Luxury Lounge & Spa INC.
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- M Burger
- M Carter Consulting LLC
- M Of Illinois INC
- M.a.c. Cosmetics INC.
- M1 Holdings LLC
- Mac Parking, INC.
- Macerich Management Company
- Mackenzie Maier
- Macy's
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- Madewell, INC
- Mado Healthcare-old Town
- Mado Management
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- Maestroshave
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- Maggiano's Banquets On Grand
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- Magnificent Milestones, INC.
- Magnifique
- Magnolia Crescent Orchards And Non-alcoholic Winery
- Maha Sughayer
- Mahler Enterprises
- Majestic Beast, LLC
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- Mango Ny, INC.
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- Maple & Ash/ Eight Bar
- Mar Beauty Lounge LLC
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- Marcus Evans, INC.
- Margaret Dyer
- Margie Korshak INC
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- Marianne Strokirk Salons
- Mariano's #8534
- Marie Co Studio
- Marieta's Spa & Salon
- Mario Tricoci Hair Salons & Day Spas, LLC
- Mario's Table
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- Mark Anthony Brewing INC.
- Mark Bernard Czyzewski
- Mark Gleberzon
- Mark Goodman & Associates, INC.
- Mark Hersch Photography
- Mark Kaplan
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- Market Data Corporation
- Marketing Information Resource, INC
- Marlowe
- Marquette Partners LP
- Marrow Fine
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- Marshall Pierce & Company
- Marshall's Landing
- Marshalls #690
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- Marwen Foundation, INC.
- Mary Johnston Paintings
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- Masala Magic
- Mason Avenue Investments
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- Massage Bliss And Bodywork
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- Master Valet Parking LLC
- Masterpiece Kitchens
- Mastro's Steakhouse
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- Materials Marketing, LTD
- Matilda And Clandestino
- Matthew Gorman
- Matthew S Cabrera
- Mattress Firm Inc., #602004
- Mattress Warehouse
- Maude Studios
- Maureen Shinners, L.L.C.
- Mauro Mafrici One Magnificent Mile Restaurant
- Maven Esthetics LLC
- Maven Global Markets Derivatives LLP
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- Maven Global Markets Trading LLP
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- Maxine
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- Mayana Designs Co
- Mayweather Boxing + Fitness
- Mccann Health Medical Communications, INC.
- Mccollum Photography
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- Mcdonalds Restaurant # 14173
- Mcdonough Enterprises, LTD
- Mce Clinical LLC
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- Meet Again LLC
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- Mejuri (us), INC.
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- Melissa Farnen
- Melissa O'brien Designs LLC
- Melissa Rickey
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- Mercer 113 / Point & Feather Chicago
- Merchandise Mart Properties, INC.
- Merchant & Rhoades
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- Merieux Nutrisciences
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- Metromart
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- Mezza
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- Mi Kay Ng
- Mia Metz Music
- Miami Corporation Management, LLC