| SSSjostrom & Sons INC | Rockford | IL | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| SSSjostrom & Sons INC | Rockford | IL | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| SOSmith Oil CO | Rockford | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| SSSos Soda Blasting, INC. | Rockford | IL | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| SMSouth Main Mart | Rockford | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| SCSpider CO INC | Rockford | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| SISugarjones, INC. | Rockford | IL | Food Manufacturing311811 | — | ◇ UNVERIFIED |
| SSSunrise Southwest Rockford | Rockford | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| SPSuper Pantry 34 | Rockford | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| SPSuper Pantry 47 | Rockford | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| SSupplycore | Rockford | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| TLTha Lad CO | Rockford | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| TEThomas Engineering INC. | Rockford | IL | Fabricated Metal Product Manufacturing332999 | — | ◇ UNVERIFIED |
| TSThompson Signs | Rockford | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| TCTorrington CO | Rockford | IL | Fabricated Metal Product Manufacturing332991 | — | ◇ UNVERIFIED |
| TSTruck Stop | Rockford | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| UOUsdol Osha- North Aurora | Rockford | IL | Fabricated Metal Product Manufacturing332439 | — | ◇ UNVERIFIED |
| UOUsdol Osha- North Aurora | Rockford | IL | Fabricated Metal Product Manufacturing332722 | — | ◇ UNVERIFIED |
| VEVentures Ed | Rockford | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| WTWilson Tool Corporation | Rockford | IL | Fabricated Metal Product Manufacturing332710 | — | ◇ UNVERIFIED |
| WCWingfoot Commercial Tire Systems LLC | Rockford | IL | Plastics and Rubber Products Manufacturing326212 | — | ◇ UNVERIFIED |
| WCWinnebago County Ethanol Plant | Rockford | IL | Chemical Manufacturing325193 | — | ◇ UNVERIFIED |
| XFXcel Foam & Packaging LLC | Rockford | IL | Plastics and Rubber Products Manufacturing326140 | — | ◇ UNVERIFIED |
| ZFZip Fasteners Products, INC. | Rockford | IL | Fabricated Metal Product Manufacturing332722 | — | ◇ UNVERIFIED |
