- One Parking Monroe INC.
- One Parking U Of I, LLC
- One Track
- Onesti Entertainment Corporation DBA Arcada Theatre
- Onigiri Kororin
- Onimaki
- 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 Store #3344
- 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
- Pane E' Pomodoro, LTD. Dba: Sapori
- Panera Bread #987
- Pangea Real Estate
- Panlasa
- Pantheon
- Pantheon
- Papa John's #3888
- Papa John's Pizza
- Paradigm Shift LLC
- Paradox
- Paragon Marketing Group, LLC
- Paramount Cleaners
- Paramount Cleaners Chicago INC.
- Paramount Events
- Paramount Events And Truffleberry Market
- Parennial Golf
- Paris Baguette
- Park 1
- 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
- Pazza Pizza
- 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
- Perspire Sauna Studio - West Loop
- 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
- 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
- Popeyes Louisiana Kitchen
- Porsche Downtown Chicago
- Portal Innovations
- Portal Innovations Fulton Labs LLC
- Portal Innovations Momentum LLC
- Porter Kitchen And Deck
- Porter Pipe & Supply City Will Call
- Portillo's
- Potbelly Sandwich Works
- Povos Downtown LLC
- Pow!
- Power Groove Coaching LLC
- Pr Adams LLC
- Pr Electronics INC.
- Praxis Group, LLC
- Prc Learning Center INC.
- Precision Human Performance
- Premier Catering & Events
- Premier Staffing Source, INC.
- Premium Parking Service, L.L.C.
- Prenuvo Clinic
- Presentation Studios International, LLC
- Presidential Towers
- Pressley Johnson Design
- Pret A Manger
- Pretty Chic Towel Service
- Prevail
- Prevue Pet Products INC
- Price F(x), INC.
- Prime 57 Restaurant & Lounge
- Prime Electrical & Exhibition Services
- Prime Mart
- Primera Engineers, LTD.
- Primitive
- Primo's Chicago Pizza
- Prince Street Pizza