| GGreif | Meridian | MS | Paper Manufacturing322219 | 20-99 | ◐ LIKELY ACTIVE |
| GRGrenada - Red Steel | 38901 | MS | Machinery Manufacturing333991 | 100-499 | ◐ LIKELY ACTIVE |
| GRGriffith Refrigeration and Electric, LLC | Carthage | MS | Machinery Manufacturing333415 | — | ◐ LIKELY ACTIVE |
| GRGRT Ripley Operations, LLC | Ripley | MS | Plastics and Rubber Products Manufacturing326299 | 20-99 | ◐ LIKELY ACTIVE |
| GGrv | Greenville | MS | Food Manufacturing311991 | 100-499 | ◐ LIKELY ACTIVE |
| GCGulf Coast Combat System Alignment LLC | Lucedale | MS | Transportation Equipment Manufacturing336611 | — | ◐ LIKELY ACTIVE |
| GSGulf States Marine, LLC | Hattiesburg | MS | Transportation Equipment Manufacturing336611 | — | ◐ LIKELY ACTIVE |
| HAhago Automotive | Iuka | MS | Transportation Equipment Manufacturing336370 | 100-499 | ◐ LIKELY ACTIVE |
| HLHankins Lumber Co, Inc | Grenada | MS | Wood Product Manufacturing321113 | 20-99 | ◐ LIKELY ACTIVE |
| HIHapco, INC | Meridian | MS | Fabricated Metal Product Manufacturing332510 | — | ◐ LIKELY ACTIVE |
| HBHaworth Bruce | Bruce | MS | Furniture and Related Product Manufacturing337214 | 100-499 | ◐ LIKELY ACTIVE |
| HHHealthy Home Solutions, LLC | Caledonia | MS | Machinery Manufacturing333413 | — | ◐ LIKELY ACTIVE |
| HSHemphill Souse & Sausage Inc | Jackson | MS | Food Manufacturing311612 | — | ◐ LIKELY ACTIVE |
| HLHenderson Lumber Company | Waynesboro | MS | Wood Product Manufacturing321113 | 20-99 | ◐ LIKELY ACTIVE |
| HSHeritage Spring Water LLC | Wiggins | MS | Beverage and Tobacco Product Manufacturing312112 | — | ◐ LIKELY ACTIVE |
| HBHGS Bioscience Sardis | Sardis | MS | Chemical Manufacturing325199 | 20-99 | ◐ LIKELY ACTIVE |
Highridge Medical | Olive Branch | MS | Miscellaneous Manufacturing339113 | 20-99 | ◐ LIKELY ACTIVE |
| HWHillbilly Wines | Saucier | MS | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |
Historical Arts & Casting, Inc. Mississippi | Lumberton | MS | Fabricated Metal Product Manufacturing332323 | 1-19 | ◐ LIKELY ACTIVE |
Hitachi Energy USA, inc. Crystal Springs | Crystal Springs | MS | Electrical Equipment, Appliance & Component Manufacturing335311 | 100-499 | ◐ LIKELY ACTIVE |
| HNHj Norris, LLC | Moss Point | MS | Fabricated Metal Product Manufacturing332312 | — | ◐ LIKELY ACTIVE |
| HSHolly Springs | Holly Springs | MS | Plastics and Rubber Products Manufacturing326199 | 20-99 | ◐ LIKELY ACTIVE |
| HCHol-Mac Corporation Plant 1 | Bay Springs | MS | Fabricated Metal Product Manufacturing332313 | 100-499 | ◐ LIKELY ACTIVE |
| HCHol-Mac Corporation Plant 4 | Bay Springs | MS | Transportation Equipment Manufacturing336390 | 20-99 | ◐ LIKELY ACTIVE |
| HFHomestead Farm and Packing, LLC | Lucedale | MS | Food Manufacturing311611 | — | ◐ LIKELY ACTIVE |
| HTHot Tamale Heaven | Greenville | MS | Food Manufacturing311612 | — | ◐ LIKELY ACTIVE |
Howard Industries Inc (Delphi) | Laurel | MS | Electrical Equipment, Appliance & Component Manufacturing335311 | 100-499 | ◐ LIKELY ACTIVE |
Howard Industries Inc. (Mendenhall) | Mendenhall | MS | Electrical Equipment, Appliance & Component Manufacturing335122 | 100-499 | ◐ LIKELY ACTIVE |
Howard Industries Inc. (Quitman) | Quitman | MS | Electrical Equipment, Appliance & Component Manufacturing335311 | 100-499 | ◐ LIKELY ACTIVE |
Howard Industries Inc. (Substation) | Ellisville | MS | Electrical Equipment, Appliance & Component Manufacturing335311 | 100-499 | ◐ LIKELY ACTIVE |
Howard Industries Inc (Transformer) | Laurel | MS | Electrical Equipment, Appliance & Component Manufacturing335311 | 500+ | ◐ LIKELY ACTIVE |
| HTHoward Technology Solutions | Ellisville | MS | Computer and Electronic Product Manufacturing334111 | 100-499 | ◐ LIKELY ACTIVE |
| HMHs Marine Propulsion LLC | Ocean Springs | MS | Fabricated Metal Product Manufacturing332999 | — | ◐ LIKELY ACTIVE |
| HVHSM Verona Fab (458) | Verona | MS | Plastics and Rubber Products Manufacturing326150 | 20-99 | ◐ LIKELY ACTIVE |
| HSH & S Utility Maintenance Services LLC | Gulfport | MS | Transportation Equipment Manufacturing336214 | — | ◐ LIKELY ACTIVE |
| HDHunter Douglas | Shannon | MS | Furniture and Related Product Manufacturing337920 | 20-99 | ◐ LIKELY ACTIVE |
| HEHunter Engineering Company Durant Manufacturing Plant | Durant | MS | Machinery Manufacturing333318 | 100-499 | ◐ LIKELY ACTIVE |
| HSHunt Southland Refining Company - Sandersville Refinery | Heidelberg | MS | Petroleum and Coal Products Manufacturing324110 | 20-99 | ◐ LIKELY ACTIVE |
| HSHutchens Stacy D | Gautier | MS | Transportation Equipment Manufacturing336612 | — | ◐ LIKELY ACTIVE |
| HSHyve Solutions | Olive Branch | MS | Computer and Electronic Product Manufacturing334111 | 500+ | ◐ LIKELY ACTIVE |
| IPIce Plant, Inc. - Meridian | Meridian | MS | Beverage and Tobacco Product Manufacturing312113 | 20-99 | ◐ LIKELY ACTIVE |
| IFIdeal Foam and Frames | Tupelo | MS | Wood Product Manufacturing321912 | 20-99 | ◐ LIKELY ACTIVE |
| IGINDEVCO Grenada | Grenada | MS | Plastics and Rubber Products Manufacturing326140 | 20-99 | ◐ LIKELY ACTIVE |
| ITInsituform Technologies LLC - Manufacturing | Batesville | MS | Textile Mills313310 | 100-499 | ◐ LIKELY ACTIVE |
| IPInternational paper | Redwood | MS | Paper Manufacturing322130 | 100-499 | ◐ LIKELY ACTIVE |
| IPInternational Paper Houston Container | Houston | MS | Paper Manufacturing322211 | 100-499 | ◐ LIKELY ACTIVE |
| IPInternational Paper - Jackson Container | Richland | MS | Paper Manufacturing322211 | 100-499 | ◐ LIKELY ACTIVE |
| IPInternational Paper - Magnolia Container | Magnolia | MS | Paper Manufacturing322211 | 100-499 | ◐ LIKELY ACTIVE |
| ISIntuitive Southaven | Southaven | MS | Miscellaneous Manufacturing339112 | 20-99 | ◐ LIKELY ACTIVE |
| JBJack Batte & Sons, Inc. - Pachuta | Pachuta | MS | Wood Product Manufacturing321113 | 20-99 | ◐ LIKELY ACTIVE |