- Nowhere Collective
- Nsn Employer Services INC
- Ntt Data Americas, INC.
- Nude Dude Food
- Nutmeg's
- Nuts On Clark-union
- Nvn Hotels
- Nvro Consultants
- O & N Engineering Development
- O K Cleaners
- O' Connor Casting Company
- O'kelly Kasprak LLC
- O's Decorating, INC.
- O2cool, LLC
- Oakcrest Capital, LLC
- Occasions Chicago
- Ocient INC.
- Oculus Development, LLC
- Ode A La Rose
- Oden & Fatzo
- Off Center Market
- Official Lollapalooza Pre-party & Fundraiser
- Ofs Brands INC
- Ogden Marathon
- Oh Danny Boys
- Oink Pigments
- Ok Cleaners
- Okidoki
- Old Town Barbershop Co.
- Olfactory Nyc
- Olga's Sparkle Personalized Cleaning, LLC
- Oliver Dogwood Florals
- Olivier Tric Dental Laboratory, LTD.
- Olson Communications, INC.
- Omakase Yume
- Omni Ecosystems
- On Your Mark Coaching And Training
- One Eleven Creative LLC
- One More Sushi Express
- One Off At Home
- One Parking
- One Parking Monroe INC.
- One Parking U Of I, LLC
- One Track
- Onesti Entertainment Corporation DBA Arcada Theatre
- Onigiri Kororin
- Ooh Catering & Events
- Open Books
- Oppenheimer & Co. INC.
- Orangetheory Fitness
- Orangetheory Fitness Chicago - West Loop
- Orangetheory Fitness Chicago South Loop West
- Orbit Medical Of Chicago, LLC
- Orbiter Coffee
- Orbitz.com
- Oriental Kitchen Corp
- Origin Ventures Group LLC
- Original Ferrara INC
- Oriole
- Ortega+ Tutoring Service Corporation
- Osco Drug #4500
- Ot Transition
- Otis Elevator Company
- Outfront Media LLC
- Outfront Media Vw Communications LLC
- Outpost Mexican Eatery
- Ovation Chicago
- Overlay
- Ovrhed Salon LLC
- P.f. Chang's China Bistro, INC.
- P.f. Chang's To Go
- P.volve LLC
- Pac Leaders
- Pac Leaders Construction LLC
- Pacific Air Travel
- Packtive
- Page One Pilates, LLC
- Page Vault INC
- Paige's
- Palace Grill
- Palm Tree Chicago LLC
- Panavision International
- Panda Express #3372
- Panera Bread # 8003
- Pangea Real Estate
- Panlasa
- Pantheon
- Pantheon
- Papa John's #3888
- Papa John's Pizza
- Paradox
- Paragon Marketing Group, LLC
- Paramount Cleaners
- Paramount Cleaners Chicago INC.
- Paramount Events
- Paramount Events And Truffleberry Market
- Parennial Golf
- Paris Baguette
- Park One
- Park One
- Park One
- Park One INC.
- Park Tavern Chicago
- Parking
- Parking In Chicago
- Parkking, INC.
- Parkside Realty, INC.
- Parlor Pizza Bar
- Parq Fulton
- Parqex INC.
- Parson's Chicken & Fish LLC
- Parsons Environment & Infrastructure Group INC.
- Parsons Services Company
- Parsons Transportation Group INC.
- Parthenon Guest House
- Partnership Employment
- Pascale Marie Hair
- Pasta Veneta
- Pastorelli Food Products,inc.
- Pastorelli Foods LLC
- Patagonia
- Patio Restaurant
- Patrick Knows Hair
- Paul Mitchell The School - Chicago
- Paw Naturals
- Pay Less Moving INC.
- Paylink Direct
- Paylink Direct
- Pb&j Pizza Beer & Jukebox
- Peanut Park Trattoria
- Pearlie Sue Cleaning LLC
- Peerless Network Of Illinois, LLC
- Peet's Coffee & Tea
- Pekay Mach & Engr Co INC
- People + Change Partners LLC
- Peopleready, INC
- Peoples Auto Parking Co
- Peoplescout Msp, LLC
- Peoplescout, INC.
- Peoria Packing LTD
- Pepe's INC
- Pepper Spice Jerk N Grill LLC
- Pepsico INC
- Peregrine Bicycle Studio
- Performance Trust Capital Partners, LLC
- Peritius Consulting
- Pernod Ricard USA
- Personnel Planners INC
- Pet Care Plus, LTD.
- Petco # 1989
- Petes Fresh Market #10
- Petote Group, LLC
- Petsmart #1658
- Petty's Accounting & Tax Service, LTD
- Pfeiffer Design And Build LLC
- Pfs
- Pgc Doors
- Phd Heating And Cooling INC.
- Phd Liquors
- Philanthropy Of Rush University Medical Center
- Philly's Best
- Philomarket
- Philomathy Digital Media Marketing
- Phlavz Bar & Grille
- Piedmont Office Management, LLC
- Pierogi Wagon
- Pillars
- Pilot Light
- Pilot Pizza
- Pimco LLC
- Pin Goal Services, LLC
- Pine And Proper
- Pink's Windows Chicago
- Pinky Nail Studio
- Pinpoint Care
- Pinpoint Precision LLC
- Pioneer Wholesale Meat Company
- Piper Sandler & Co
- Pita Pita Mediterranean Grill
- Pitaki
- Pitch & Pour Supper Club
- Pivoting In Heels, NFP
- Pizza Hut Slice Bar
- Pizza Lobo
- Planet Recovery Systems
- Plante & Moran, Pllc
- Play
- Plymouth Partners LP
- Pma West Loop
- Pockets
- Poise.cc
- Poke Poke
- Polina Soldatova
- Political Fund-chicago Journeymen Plumbers' Local Union 130, U.a.
- Polk Street Pub
- Pompei Bakery
- Pompei Produce
- Popeyes Chicken & Biscuits
- Popeyes Chicken/indian Swaad
- Popeyes Famous Fried Chicken