| NSNippon Steel Pipe America Inc | Seymour | IN | Primary Metal Manufacturing331110 | 100-499 | ◐ LIKELY ACTIVE |
| OAO&k American - Seymour Plant | Seymour | IN | Primary Metal Manufacturing331222 | 20-99 | ◐ LIKELY ACTIVE |
| PDPorta Door Co., Inc. | Seymour | CT | Furniture and Related Product Manufacturing337110 | 20-99 | ◐ LIKELY ACTIVE |
| PFProvimi Foods, Inc. | Seymour | WI | Food Manufacturing311612 | — | ◐ LIKELY ACTIVE |
| PFProvimi Foods, Inc. | Seymour | WI | Food Manufacturing311612 | — | ◐ LIKELY ACTIVE |
| SFSeymour Facility | Seymour | MO | Transportation Equipment Manufacturing336212 | 100-499 | ◐ LIKELY ACTIVE |
| SPSilgan Plastics | Seymour | IN | Plastics and Rubber Products Manufacturing326160 | 100-499 | ◐ LIKELY ACTIVE |
| SSSmalltown Spirits | Seymour | IN | Beverage and Tobacco Product Manufacturing312140 | — | ◐ LIKELY ACTIVE |
| SPSpaceGuard Products | Seymour | IN | Fabricated Metal Product Manufacturing332618 | 20-99 | ◐ LIKELY ACTIVE |
| TGThule Group | Seymour | CT | Transportation Equipment Manufacturing336390 | 100-499 | ◐ LIKELY ACTIVE |
| TSTRG Seymour | Seymour | IN | Paper Manufacturing322211 | 100-499 | ◐ LIKELY ACTIVE |
| VMValent Mid-West Agricultural Research Center (MWARC) | Seymour | IL | Chemical Manufacturing325320 | 1-19 | ◐ LIKELY ACTIVE |
| VValeo | Seymour | IN | Transportation Equipment Manufacturing336320 | 500+ | ◐ LIKELY ACTIVE |
| WOWhispering Oaks Vineyard & Winery | Seymour | MO | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |
| TETrellis Earth Products INC | Seymour | IN | Plastics and Rubber Products Manufacturing326199 | — | ◇ UNVERIFIED |
| AUAisin USA Manufacturing Incorporated | Seymour | IN | Transportation Equipment Manufacturing336390 | — | ◇ UNVERIFIED |
| AUAisin USA Manufacturing INC Plant Ii | Seymour | IN | Transportation Equipment Manufacturing336390 | — | ◇ UNVERIFIED |
| BCBasf Corporation | Seymour | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| BSBooth Signs, Inc. | Seymour | IN | Miscellaneous Manufacturing339950 | — | ◇ UNVERIFIED |
| CICummins Incorporated | Seymour | IN | Machinery Manufacturing333618 | — | ◇ UNVERIFIED |
| CICummins INC. Seymour Hhp Block Line Facility | Seymour | IN | Machinery Manufacturing333618 | — | ◇ UNVERIFIED |
| FCFalls Cleaning Products LLC | Seymour | WI | Chemical Manufacturing325611 | — | ◇ UNVERIFIED |
| HHHayes Honey Farm LLC | Seymour | MO | Food Manufacturing311999 | — | ◇ UNVERIFIED |
| HJHumble Joes Coffee Company LLC | Seymour | IN | Machinery Manufacturing333241 | — | ◇ UNVERIFIED |
| IMIrving Materials Incorporated Seymour | Seymour | IN | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| LULamor USA Corporation | Seymour | CT | Machinery Manufacturing333298 | — | ◇ UNVERIFIED |
| MSMidwest Steel and Rebar LLC | Seymour | MO | Fabricated Metal Product Manufacturing332312 | — | ◇ UNVERIFIED |
| MCMissouri Casket CO INC | Seymour | MO | Miscellaneous Manufacturing339995 | — | ◇ UNVERIFIED |
| MIMw Industries, INC Dba Raf Electronic Hardware | Seymour | CT | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| MHMy Hoosier Hearth LLC | Seymour | IN | Machinery Manufacturing333414 | — | ◇ UNVERIFIED |
| OPOnyx Paving Company | Seymour | IN | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| PFPerformance Fab, LLC | Seymour | WI | Fabricated Metal Product Manufacturing332710 | — | ◇ UNVERIFIED |
| PMPhoenix Machine Company, INC. | Seymour | CT | Fabricated Metal Product Manufacturing332710 | — | ◇ UNVERIFIED |
| RDRr Donnelley | Seymour | IN | Printing and Related Support Activities323110 | — | ◇ UNVERIFIED |
| SISabic Innovative Plastics | Seymour | IN | Chemical Manufacturing325211 | — | ◇ UNVERIFIED |
| SMSeymour Manufacturing Company Incorporated | Seymour | IN | Wood Product Manufacturing321999 | — | ◇ UNVERIFIED |
| STSeymour Tubing Incorporated | Seymour | IN | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| VMVernier Metal Fabricating, Inc. | Seymour | CT | Fabricated Metal Product Manufacturing332313 | — | ◇ UNVERIFIED |
| WCWoodHouse Cabinetry, LLC | Seymour | MO | Wood Product Manufacturing321999 | — | ◇ UNVERIFIED |