| RMReliable Materials CORP of Il | Chicago | IL | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| RCRemet CORP | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| RMReserve Marine Terminal | Chicago | IL | Primary Metal Manufacturing331110 | — | ◇ UNVERIFIED |
| RTResource Technology Corp-paxton | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| RPRez Packaging INC | Chicago | IL | Chemical Manufacturing325611 | — | ◇ UNVERIFIED |
| RDRider Dickerson INC | Chicago | IL | Printing and Related Support Activities323111 | — | ◇ UNVERIFIED |
| RARippel Architectural Metals INC | Chicago | IL | Fabricated Metal Product Manufacturing332312 | — | ◇ UNVERIFIED |
| RCRita CORP | Chicago | IL | Chemical Manufacturing325411 | — | ◇ UNVERIFIED |
| RLRm Lucas CO | Chicago | IL | Petroleum and Coal Products Manufacturing324122 | — | ◇ UNVERIFIED |
| RARohm and Haas Chemicals LLC | Chicago | IL | Chemical Manufacturing325320 | — | ◇ UNVERIFIED |
| RDRotation Dynamics CORP | Chicago | IL | Plastics and Rubber Products Manufacturing326299 | — | ◇ UNVERIFIED |
| RRR & R Materials | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| RSRr Street & CO INC | Chicago | IL | Machinery Manufacturing333998 | — | ◇ UNVERIFIED |
| RSR S Owens and Company | Chicago | IL | Fabricated Metal Product Manufacturing332215 | — | ◇ UNVERIFIED |
| RBRubschlager Baking CORP | Chicago | IL | Food Manufacturing311812 | — | ◇ UNVERIFIED |
| RPRycoline Products INC | Chicago | IL | Chemical Manufacturing325998 | — | ◇ UNVERIFIED |
| SESalisbury Electrical Safety LLC | Chicago | IL | Plastics and Rubber Products Manufacturing326299 | — | ◇ UNVERIFIED |
| SISarcol INC | Chicago | IL | Machinery Manufacturing333514 | — | ◇ UNVERIFIED |
| SGSchiele Graphics INC | Chicago | IL | Printing and Related Support Activities323110 | — | ◇ UNVERIFIED |
| SBSchultz Barrel & Drum | Chicago | IL | Plastics and Rubber Products Manufacturing326199 | — | ◇ UNVERIFIED |
| SBSchulze & Burch Biscuit CO | Chicago | IL | Food Manufacturing311821 | — | ◇ UNVERIFIED |
| SPScientific Plating CO. INC | Chicago | IL | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| SJScully Jones CORP | Chicago | IL | Machinery Manufacturing333515 | — | ◇ UNVERIFIED |
| SPService Products INC | Chicago | IL | Wood Product Manufacturing321219 | — | ◇ UNVERIFIED |
| SWService Web Offset CORP | Chicago | IL | Printing and Related Support Activities323111 | — | ◇ UNVERIFIED |
| SGSethness Greenleaf INC | Chicago | IL | Food Manufacturing311930 | — | ◇ UNVERIFIED |
| SWSeven Worldwide INC | Chicago | IL | Printing and Related Support Activities323120 | — | ◇ UNVERIFIED |
| SCSf Ch1, LLC | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| SPSfg/scott Petersen | Chicago | IL | Food Manufacturing311612 | — | ◇ UNVERIFIED |
| SBSh Bell CO | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| SSSheridan Sand & Gravel | Chicago | IL | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| SWSherwin Williams CO | Chicago | IL | Chemical Manufacturing325130 | — | ◇ UNVERIFIED |
| SCSilgan Closures LLC #35 | Chicago | IL | Fabricated Metal Product Manufacturing332115 | — | ◇ UNVERIFIED |
| SHSk Hand Tool CORP | Chicago | IL | Fabricated Metal Product Manufacturing332212 | — | ◇ UNVERIFIED |
| SISkw Industries LLC | Chicago | IL | Fabricated Metal Product Manufacturing332812 | 20-99 | ◇ UNVERIFIED |
| SASmall Assemblies INC | Chicago | IL | Primary Metal Manufacturing331523 | — | ◇ UNVERIFIED |
| SASmall Assemblies INC | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| SBSmith Brothers CO | Chicago | IL | Food Manufacturing311352 | — | ◇ UNVERIFIED |
| SCSolo Cup CO | Chicago | IL | Paper Manufacturing322215 | — | ◇ UNVERIFIED |
| SPSoodik Printing CO | Chicago | IL | Textile Mills313310 | — | ◇ UNVERIFIED |
| SCSouth Chicago Property Development | Chicago | IL | Nonmetallic Mineral Product Manufacturing327410 | — | ◇ UNVERIFIED |
| SISpecialloy INC | Chicago | IL | Primary Metal Manufacturing331420 | — | ◇ UNVERIFIED |
| SPSpecified Plating CO | Chicago | IL | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| SCSpraylat CORP Il | Chicago | IL | Chemical Manufacturing325510 | — | ◇ UNVERIFIED |
| STStar Thermoplastic | Chicago | IL | Chemical Manufacturing325991 | — | ◇ UNVERIFIED |
| SDSterling Disposable Products | Chicago | IL | Furniture and Related Product Manufacturing337910 | — | ◇ UNVERIFIED |
| SPStewarts Private Blend Foods INC | Chicago | IL | Food Manufacturing311920 | — | ◇ UNVERIFIED |
| SMStrategic Materials INC | Chicago | IL | Nonmetallic Mineral Product Manufacturing327212 | — | ◇ UNVERIFIED |
| SMStrategic Materials INC | Chicago | IL | Nonmetallic Mineral Product Manufacturing327215 | — | ◇ UNVERIFIED |
| SCStrombecker CORP | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |