- WW Limited PartnershipChicago
- Wynkoop Holdings, L.L.C.Libertyville
- Wynright CorporationElk Grove Village
- XAI Octagon Credit TrustChicago
- Xanadu 160 E. Elk Trail LLCBloomingdale
- XCELL BUILDING, LLCLEMONT
- X-CEL TECHNOLOGIES, INC.TINLEY PARK
- X-CHANGE FINANCIAL ACCESS LLCSCHAUMBURG
- XIAMEN, LLCELGIN
- XL LIFE INSURANCE AND ANNUITY COMPANYSCHAUMBURG
- Xpresstrade LLCChicago
- XSPECIALLY YOURS INC.Chicago
- XYMOGEN, INC.DARIEN
- Yackley Holding Company, LLCGlencoe
- Yamuna Enterprises, Inc.Chicago
- Yaskawa America, Inc.Springfield
- Yavitski L.L.C.Wheaton
- Yazaki North America, Inc.Springfield
- YETTER MANUFACTURING COMPANYPeoria
- Yiorgo, LLCElmhurst
- YMCA OF METROPOLITAN CHICAGO LLCCHICAGO
- Yontz Family Farms, Inc.Peoria
- Young Men's Christian Association of ChicagoChicago
- YOUNG MENS CHRISTIAN ASSOC. MCGAW, INC.Evanston
- Yucca Trails Community Partners, LPRockford
- ZAGMOUT WEALTH MANAGEMENT CO.CHICAGO
- Zale Condos LLCChicago
- Zale/Lawrence LLCChicago
- ZALICO Variable Annuity Separate Account CSchaumburg
- Zalix, Inc.St. Charles
- ZAZOVE ASSOCIATES, INC.Deerfield
- ZenaPay, Inc.Wheeling
- Zen Trading FX LLCSpringfield
- Zeta Associates LLCNorthbrook
- ZF Group, Inc.Chicago
- ZHOU B LLCCHICAGO
- Zieba Dentistry Highland Park, Ltd.Skokie
- Zieba Dentistry Naperville, Ltd.Elmhurst
- Zienty Family Investments, LLCRiverwoods
- Zikainim, Inc.Chicago
- ZINSA ENTERPRISES, INC.PLAINFIELD
- ZIP DEE AWNINGS LLCVERNON HILLS
- ZLANTRADER, LLCCHICAGO
- ZnT L.L.C.Chicago
- Zonta InternationalOak Brook
- ZS ASSOCIATES INTERNATIONAL, INC.SPRINGFIELD
- ZUTAT FEED SOLUTIONS, LLCFORREST
- Zye Gzunt, LLCSkokie