- Andina Comfort Food
- Andrea Boyd
- Andrea Hair X0 LLC
- Andrea Luehmann, LTD
- Andrea Williams
- Andrews Paper INC
- Anees Upholstery INC
- Angel's Billing Company LLC
- Angela's Charter Service, INC.
- Angelica
- Angeline Sanders
- Anima Travel
- Animal Advocate Pet Hospital
- Ankura Consulting Group, LLC
- Anmar Foods
- Anne Hilderbrand
- Another Level Units
- Ansonia Properties LLC
- Antares Capital LP
- Anthropologie
- Anticonquista Cafe
- Antonio Cerezo Hernandez
- Aodake Ramen
- Ap Strategies, LLC
- Apothefaery
- Apparel Industry Board, INC.
- Apple Mart
- Apple Spice Box Lunch Delivery And Catering Co.
- Applied Systems, INC.
- Aqua Food & Spirits
- Aquacultured Foods
- Aramark At Boeing
- Aramark Correctional Services, LLC
- Arbys
- Arch Amenities Group
- Arch Angel Services
- Archistoric Products
- Archistoric Products
- Argos Vision INC.
- Aria Properties
- Armoca Desi Grill
- Arper USA INC
- Arrow Messenger Service, INC.
- Art (n) Laboratory
- Art + Science Salon
- Art Of Pretty By Toni LLC
- Art Services Chicago
- Artemida Construction
- Arthur And Lucca
- Arthur Harris & Company
- Artisan For Hire INC
- Artopolis Bakery, Cafe & Angor
- Arturo Express
- Asadito Taqueria/wok N Bao
- Ascend Justice
- Ascend Now
- Ascend Real Estate Group LLC
- Ashland Commercial, LLC
- Ashley Furniture Homestore
- Ashley Homestore
- Aspen Dental
- Aspen Dental Management, INC.
- Aspis Studio LLC
- Asrai Garden
- Association Forum Foundation
- Association Forum Of Chicagoland
- Astarr Studio
- Astro Insulation Of Illinois, LLC
- At Your Service, L.L.C.
- At&t Authorized Retailer
- At&t Illinois
- At&t Mobility
- At&t Mobility
- Atema, INC.
- Athelemed
- Athena Restaurant
- Athenian Candle Co LLC
- Au Bon Pain
- Au Cheval
- August Edick
- Auntie Anne's Pretzels
- Auntie Anne's, Cinnabon, Carvel
- Auntie Annie's Pretzels
- Aura Staffing Partners Chicago
- Aura Technologies, INC.
- Aurum Vp
- Authorized Dealer For Metro By T-mobile
- Auto - Chlor System Of The Mid South, LLC
- Auto Repair And Body Shop LLC
- Auto Valet
- Autosync, LLC
- Av Chicago, INC.
- Avail Car Share
- Avcoa
- Avec
- Avenue
- Avenue Metal Mfg Co INC
- Awad Eyecare, S.c.
- Awakenings Cafe
- Awin INC.
- Axelle + Ivy Salon
- Axess Chronos
- Axiom Flame LLC
- Axion Building Concepts
- Axios Architects & Consultants, LTD.
- Azcon Metals
- Aztec Plastic Company
- Azul 18 On Taylor
- B. P. Gas
- B.i. Tea & Dim Sum
- B's Kitchen
- Baba Pita
- Baca Plumbing Corp
- Bacci Pizza
- Bacci Pizzeria
- Baci Amore
- Bad Axe Throwing
- Bad Trader LLC
- Bagbuy Flexible Packaging
- Baggett's Lawncare, Co.
- Bailey Mcdowell
- Bakewell
- Ballast Point Brewing Company
- Balyasny Asset Management L.P.
- Bambola, Coquette & Expat
- Banana Glades, LLC
- Banc Of America Leasing & Captial, LLC
- Banfield Pet Hospital #5275
- Bang Chop
- Banner Property Management, LLC
- Bar Louie
- Bar Siena
- Bar Takito
- Bar Tutto
- Baramaro, LLC DBA Maudes
- Barangaroos Aussie Pies
- Barbie Cafe
- Barbizon Light Of Chicago
- Barchart.com
- Bare Feet Power Yoga
- Bark Avenue Playcare, INC.
- Barking Owl
- Barre3 Chicago - West Loop
- Barron Custom Furniture, INC
- Barton Senior Residences Of Chicago
- Bartucci Salon
- Base Salon
- Basecamp Fitness
- Basecamp, LLC
- Basi Pilates Academy
- Bc Cleaners
- Bc Cleaners
- Bcd Travel
- Bcg
- Beach Custom Upholstery LLC
- Bean Products INC
- Beatrix
- Beauty Mark Salon
- Beehive Shoeworks
- Beggar's Pizza
- Beity
- Belgravia Construction Corp.
- Belgravia Group, LTD.
- Bell Heirs Bbq
- Bella Pelle Salon & Spa
- Belle And Arrow
- Bellicon USA
- Bellion Studio
- Ben Trapani
- Benjyehuda
- Bensdorf And Abramson, INC.
- Bentley
- Bentley's Pet Stuff
- Berlin Packaging L.L.C.
- Bert's Jerk Grill And Seafood
- Best Buy
- Bestowal LLC
- Beth Bayman Hair
- Beviamo
- Beyond Yoga
- Bhfx Imaging
- Big Boyz Hats
- Big Brothers-big Sisters Of Metropolitan Chicago
- Big City Optical
- Big City Pickle, LLC
- Big Monster Toys LLC
- Big Shoulders Coffee
- Big Star Transit, LLC
- Bikram Yoga Chicago
- Bikram Yoga West Loop
- Billy Goat Tavern
- Binny's
- Bio Nail
- Biogenesis Analytical Laboratory INC.
- Biotwo Corporation
- Bisous Chicago
- Bitter Ex Bitters & Syrups
- Bittersweet
- Bkb West Loop
- Black Briar Tavern