| HDHoffmann Die Cast LLC | Saint Joseph | MI | Primary Metal Manufacturing331521 | 20-99 | ◐ LIKELY ACTIVE |
| HMHoist Material Handling LLC | East Chicago | IN | Machinery Manufacturing333924 | 100-499 | ◐ LIKELY ACTIVE |
| HEHoneywell Electronic Chemicals - Bryan Plant | Bryan | TX | Chemical Manufacturing325180 | 20-99 | ◐ LIKELY ACTIVE |
| HIHoneywell International Greer | Greer | SC | Machinery Manufacturing333611 | 100-499 | ◐ LIKELY ACTIVE |
| HTHoover Treated Wood Products, INC. | Bakersfield | CA | Wood Product Manufacturing321114 | 20-99 | ◐ LIKELY ACTIVE |
| HTHoover Treated Wood Products Oxford Facility | Oxford | PA | Wood Product Manufacturing321114 | 20-99 | ◐ LIKELY ACTIVE |
Hormel Foods CORP - Austin Plant | Austin | MN | Food Manufacturing311611 | 500+ | ◐ LIKELY ACTIVE |
Hormel Foods Corporation Beloit Plant | Beloit | WI | Food Manufacturing311610 | — | ◐ LIKELY ACTIVE |
| HOHouse of Flavors | Ludington | MI | Food Manufacturing311520 | 100-499 | ◐ LIKELY ACTIVE |
| HMHoward Miller Company | Zeeland | MI | Wood Product Manufacturing321999 | 100-499 | ◐ LIKELY ACTIVE |
| HHHp Hood | Winchester | VA | Food Manufacturing311511 | 500+ | ◐ LIKELY ACTIVE |
| HHHp Hood LLC - Agawam Plant | Agawam | MA | Food Manufacturing311511 | 100-499 | ◐ LIKELY ACTIVE |
| HHHp Hood LLC - Oneida, Ny | Oneida | NY | Food Manufacturing311511 | 100-499 | ◐ LIKELY ACTIVE |
| HHHp Hood Vernon | Vernon | NY | Food Manufacturing311511 | 100-499 | ◐ LIKELY ACTIVE |
| HRH & R Screw Machine Products INC | Reed City | MI | Fabricated Metal Product Manufacturing332721 | 20-99 | ◐ LIKELY ACTIVE |
| HFHubbard Feeds INC | Botkins | OH | Food Manufacturing311119 | 20-99 | ◐ LIKELY ACTIVE |
| HFHubbard Feeds INC | Iowa City | IA | Food Manufacturing311119 | 20-99 | ◐ LIKELY ACTIVE |
| HFHubbard Feeds INC - Mankato | Mankato | MN | Food Manufacturing311119 | 20-99 | ◐ LIKELY ACTIVE |
| HPHubbell Power Systems / Ohio Brass | Wadsworth | OH | Computer and Electronic Product Manufacturing334413 | 20-99 | ◐ LIKELY ACTIVE |
Huber Engineered Woods, LLC | Spring City | TN | Wood Product Manufacturing321219 | 100-499 | ◐ LIKELY ACTIVE |
| HCHussman Corporation-bridgeton | Bridgeton | MO | Fabricated Metal Product Manufacturing332999 | 500+ | ◐ LIKELY ACTIVE |
| HCHussmann CORP | Suwanee | GA | Machinery Manufacturing333415 | 100-499 | ◐ LIKELY ACTIVE |
| HIHutchens Industries Mansfield Facility | Mansfield | MO | Transportation Equipment Manufacturing336212 | 100-499 | ◐ LIKELY ACTIVE |
| HSHydro-chem Systems | Caledonia | MI | Chemical Manufacturing325611 | 20-99 | ◐ LIKELY ACTIVE |
| IMIatric Manufacturing Solutions | Morristown | TN | Paper Manufacturing322291 | — | ◐ LIKELY ACTIVE |
| IMIbc Manufacturing CO | Memphis | TN | Chemical Manufacturing325320 | 20-99 | ◐ LIKELY ACTIVE |
| IMIcco Middelton | Caldwell | ID | Nonmetallic Mineral Product Manufacturing327320 | 20-99 | ◐ LIKELY ACTIVE |
| IIIcm INC | Colwich | KS | Fabricated Metal Product Manufacturing332312 | 100-499 | ◐ LIKELY ACTIVE |
| ILIdemitsu Lubricants America Corporation | Jeffersonville | IN | Petroleum and Coal Products Manufacturing324191 | 100-499 | ◐ LIKELY ACTIVE |
| IAIff Augusta LTD | Augusta | GA | Food Manufacturing311930 | 1-19 | ◐ LIKELY ACTIVE |
| IOIi-vi Optoelectronic Devices, INC. | Warren | NJ | Computer and Electronic Product Manufacturing334413 | 1-19 | ◐ LIKELY ACTIVE |
| IMIko Midwest INC | Kankakee | IL | Petroleum and Coal Products Manufacturing324122 | 100-499 | ◐ LIKELY ACTIVE |
| INIko Northeast, INC. | Hagerstown | MD | Plastics and Rubber Products Manufacturing326299 | 20-99 | ◐ LIKELY ACTIVE |
| IPIko Pacific INC Sumas | Sumas | WA | Petroleum and Coal Products Manufacturing324122 | 100-499 | ◐ LIKELY ACTIVE |
| IOIl Ozinga Plants-mokena | Mokena | IL | Nonmetallic Mineral Product Manufacturing327320 | 20-99 | ◐ LIKELY ACTIVE |
| IDImperial Die Casting | Liberty | SC | Primary Metal Manufacturing331521 | 100-499 | ◐ LIKELY ACTIVE |
| IZImperial Zinc CORP | Chicago | IL | Primary Metal Manufacturing331420 | 20-99 | ◐ LIKELY ACTIVE |
| ISImporters Service CORP | Edison | NJ | Food Manufacturing311999 | 20-99 | ◐ LIKELY ACTIVE |
| IOImsamet of Arizona INC | Goodyear | AZ | Primary Metal Manufacturing331314 | 20-99 | ◐ LIKELY ACTIVE |
| IAIndiana Automotive Fasteners Incorporated | Greenfield | IN | Fabricated Metal Product Manufacturing332721 | 500+ | ◐ LIKELY ACTIVE |
| IGIndiana Galvanizing LLC | Middlebury | IN | Fabricated Metal Product Manufacturing332812 | 20-99 | ◐ LIKELY ACTIVE |
| ICIndustrial Composite Systems, LLC | Lakeland | FL | Leather and Allied Product Manufacturing316110 | — | ◐ LIKELY ACTIVE |
| IHIndustrial Hard Chrome LTD | Geneva | IL | Fabricated Metal Product Manufacturing332813 | 20-99 | ◐ LIKELY ACTIVE |
Industrial Metal Finishing, INC. | Placentia | CA | Fabricated Metal Product Manufacturing332811 | — | ◐ LIKELY ACTIVE |
| IPIndustrial Plating Incorporated | Lafayette | IN | Fabricated Metal Product Manufacturing332813 | 20-99 | ◐ LIKELY ACTIVE |
| ISIndustrial Support INC | Buffalo | NY | Fabricated Metal Product Manufacturing332999 | 20-99 | ◐ LIKELY ACTIVE |
| IOIneos O&p USA LLC - Battleground Manufacturing | La Porte | TX | Chemical Manufacturing325110 | 100-499 | ◐ LIKELY ACTIVE |
| IVIngevity Virginia Corporation - Carbon Plant | Wickliffe | KY | Chemical Manufacturing325199 | 100-499 | ◐ LIKELY ACTIVE |
| IWIngredion Winston Salem | Winston Salem | NC | Food Manufacturing311221 | 100-499 | ◐ LIKELY ACTIVE |
| IDInland Die Casting INC | Wheeling | IL | Primary Metal Manufacturing331521 | 100-499 | ◐ LIKELY ACTIVE |