- The Ryan Licht Sang Bipolar Foundation
- The Scion Group
- The Scout Waterhouse + Kitchen
- The Secret Garden Of Chicago LTD.
- The Selfie Haus Of Chicago
- The Senior Space, LLC
- The Service Club Of Chicago
- The Set Collective
- The Shamrock Club
- The Signature Blowout
- The Simons Group
- The Sive Group INC
- The Smith
- The Sono Chicago LLC
- The Space Between Yoga
- The Spice House
- The St. Clair Hotel
- The Sterling Law Office LLC
- The Surgery Center At 900 North Michigan Avenue, LLC
- The Talbott Hotel
- The Total Training Company
- The Trails School, INC.
- The Tremont Hotel
- The Tribal Looms, INC.
- The University Of Chicago
- The Ups Store
- The Ups Store
- The Ups Store
- The Ups Store #2872
- The Ups Store 8737
- The Vig Chicago
- The Vitamin Shoppe
- The Wade
- The Washington Post
- The Wellsley
- The Westin Michigan Avenue
- The Wine Huntress
- Theatre Of The Mind
- Themart Conference
- Thematic Campaigns LLC
- Themis Bar Review, LLC
- Theory Sport.dine.lounge
- Thibaut INC.
- Thicklin Commercial & Residential Cleaning Services, LLC
- Thinkorswim
- Third Coast Stitches
- Thirdwave LLC
- Thomas Best
- Thomas P Schoeffel
- Thomas Pink
- Thomas West Salon
- Thompson Chicago Hotel
- Thomson Reuters (tax & Accounting) INC.
- Thread 'n' Wax Beauty Bar
- Thread Away
- Thread Away
- Three Cities Social
- Three Dots And A Dash
- Three Laundry LLC
- Thy Will Cleaning/janitorial Service
- Ticket Booth And Dock Owner, LLC
- Tiffany And Company Us Sales LLC
- Tila & The Textiles
- Tim Bailkowski
- Time Machine Chicago
- Timothy O'tooles
- Tiny Tavern
- Tip-top Branding LLC
- Tiparos Thai Restaurant
- Tivvy Nails & Spa Boutique
- Tj Maxx #1406
- Tlh Global Group
- Tlh Vending
- Tlscontact (usa), INC.
- Toast It Iz
- Toffee Traditions LLC
- Toland's
- Tom Ford
- Tom Ford
- Tom Stringer Design Partners
- Tomato Head
- Tommy Bahama
- Tony & Bruno's
- Top Box Foods
- Top Brass Men's Hair Loft LLC
- Top Coat Nail Spa
- Top Coat Nail Spa
- Toplist
- Topo Gigio Ristorante
- Topthink, Koranos
- Torchio
- Torshen Capital Management, LLC
- Tortazo
- Tortoise Club
- Tory Burch
- Toss It Up
- Total Laser Concepts
- Totalworks
- Toto Usa, INC.
- Touchdown Ventures INC.
- Tour Chicago, INC.
- Tourneau
- Tower Cleaners & Tailors
- Town Square Cleaners
- Toyota Of Downtown Chicago
- Tpg Hotels & Resorts, INC
- Tr Health And Wellness Group
- Tracy Adduci Salon
- Trader Joe's East
- Tradewise Advisors, INC.
- Traditions Barber Parlor
- Traditions Barber Parlor Of Rivernorth
- Traen, INC
- Train Moment
- Tran Nails Salon
- Transcend Marketing LLC
- Translumen Technologies
- Transportation One LLC
- Trav Net INC
- Travel Traders #501
- Travelle
- Treacy Marketing Group
- Tree House Chicago / Tunnel
- Tribune Content Agenccy LLC
- Tribune Tower East (chicago) Owner LLC
- Tribune Tower West (chicago) Owner LLC
- Trilogy Real Estate Group
- Triskele
- Tropic Construction Corp
- Trove
- Tru Travel Solutions
- True Food Kitchen
- True Skin Care Center, P.C.
- Truluck's Seafood, Steak And Crab House
- Trump International Hotel
- Tsukiji Fish Market
- Tubby's Taste
- Tuohy Furniture Corp
- Turkish Airlines INC.
- Turned LLC
- Turner & Townsend Heery, LLC
- Turner & Townsend Pjm Us LLC
- Tuts Store
- Tvilum
- Twenty/20 Talent Group
- Twin2me Services
- Twine
- Two Maids Of Chicago Loop
- Two Sigma Construction Group, INC.
- Tyler Budzar
- Tzuco / Tales / Panango
- U.s. Messenger Logistics Management Group
- Ugg
- Ulitimate Bride
- Ullo Designs LTD
- Ulta Beauty
- Umi Nail & Spa
- Ummo & The Loft
- Un Cork It
- Uncle Julio's Hacienda / Savage Burrito
- Underground Chicago
- Uni Lottery And Snacks / Sundry Store
- Unicorn World
- Union Cut Club
- Union Hall Advising
- Union Square Cleaners
- Union Sushi & Barbeque Bar
- Union Sushi + Barbeque Bar / Up Bar
- Union Sushi + Bbq + Izakaya
- Uniqlo
- Uniqlo USA LLC
- Unique Touches By Just Me
- United Way Of Metropolitan Chicago
- Unity Manufacturing Co.
- University Children's Center
- Untamed Hearts
- Untitled 111
- Untuckit Il, LLC
- Untuckit Northbridge, LLC
- Untuckit Retail, LLC
- Uovo Wine
- Updhift
- Updown Tobacco Shop
- Uproar Food & Beverage
- Uproar Pr
- Ups Store
- Ups Store 2096
- Upshift Creative, INC.
- Upshot, LLC
- Uptake Technologies, INC.
- Urban Athlete / Press Coffee Studio
- Urban Child Academy, LLC
- Urban Grind
- Urban Innovations, LTD.
- Urban Oasis
- Urban Oasis Massage
- Urban Oasis North Avenue INC.
- Urban Outfitters #19
- Urban Playground
- Urbane Blades