| HPHolts Precision, INC. | South Windsor | CT | Machinery Manufacturing333517 | — | ◇ UNVERIFIED |
| HHHolzknecht Holding, LLC | Putnam | CT | Fabricated Metal Product Manufacturing332722 | — | ◇ UNVERIFIED |
| HKHope Kitchen Cabinets & Stone Supply, LLC | Bridgeport | CT | Nonmetallic Mineral Product Manufacturing327991 | — | ◇ UNVERIFIED |
| HOHouse of Doors, INC. | Cheshire | CT | Wood Product Manufacturing321911 | — | ◇ UNVERIFIED |
| HHH.p. Hood, LLC | Suffield | CT | Food Manufacturing311520 | — | ◇ UNVERIFIED |
| IIIda Installations, INC. | Southington | CT | Fabricated Metal Product Manufacturing332323 | — | ◇ UNVERIFIED |
| IPIdentification Products Corporation | Bridgeport | CT | Printing and Related Support Activities323111 | — | ◇ UNVERIFIED |
| IIkasa | Hartford | CT | Furniture and Related Product Manufacturing337125 | — | ◇ UNVERIFIED |
| INIndeco North America, INC. | Milford | CT | Machinery Manufacturing333120 | — | ◇ UNVERIFIED |
| IMIndependent Metalworx, Inc. | Ansonia | CT | Fabricated Metal Product Manufacturing332710 | — | ◇ UNVERIFIED |
| IPIndustrial Precious Metals LLC | Wallingford | CT | Primary Metal Manufacturing331492 | — | ◇ UNVERIFIED |
| ISIndustrial Strength LLC | Wallingford | CT | Miscellaneous Manufacturing339993 | — | ◇ UNVERIFIED |
| IHInfinity Holdings Company LLC | Terryville | CT | Fabricated Metal Product Manufacturing332812 | — | ◇ UNVERIFIED |
| IDInnovative Display & Design, Inc. | Milford | CT | Miscellaneous Manufacturing339950 | — | ◇ UNVERIFIED |
| IOInsulpane of Connecticut Incorporated | Hamden | CT | Nonmetallic Mineral Product Manufacturing327211 | — | ◇ UNVERIFIED |
| IAIntelligent Audio Products INC. | Westport | CT | Computer and Electronic Product Manufacturing334310 | — | ◇ UNVERIFIED |
 International Cordage East, LTD. | Taftville | CT | Textile Product Mills314991 | — | ◇ UNVERIFIED |
| IPInternational Paper Company | Versailles | CT | Paper Manufacturing322130 | — | ◇ UNVERIFIED |
| ISInternational Stone, INC. | Ansonia | CT | Nonmetallic Mineral Product Manufacturing327991 | — | ◇ UNVERIFIED |
| ILIron&Oak LLC | Bethel | CT | Fabricated Metal Product Manufacturing332323 | — | ◇ UNVERIFIED |
| IPI.t.w. Powertrain Fastening | Naugatuck | CT | Transportation Equipment Manufacturing336370 | — | ◇ UNVERIFIED |
| JWJarosz Welding CO. INC. | Hartford | CT | Fabricated Metal Product Manufacturing332312 | — | ◇ UNVERIFIED |
| JBJasco Battery Specialist, Inc. | Oxford | CT | Electrical Equipment, Appliance & Component Manufacturing335912 | — | ◇ UNVERIFIED |
| JBJasco Battery Specialists, INC. | Oxford | CT | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| JCJ.E.T. Corporation | Bridgeport | CT | Primary Metal Manufacturing331523 | — | ◇ UNVERIFIED |
| JPJgs Property Dba R.a. Lalli, INC. | Stratford | CT | Machinery Manufacturing333298 | — | ◇ UNVERIFIED |
| JLJ & L Plastic Molding, INC. | Wallingford | CT | Plastics and Rubber Products Manufacturing326199 | — | ◇ UNVERIFIED |
| JIJoma, INC. | Waterbury | CT | Fabricated Metal Product Manufacturing332119 | — | ◇ UNVERIFIED |
| JJJonathan J Morasutti | Meriden | CT | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
 Joval Machine Co., INC. | Wallingford | CT | Fabricated Metal Product Manufacturing332116 | — | ◇ UNVERIFIED |
| JIJri Industries, INC. | Berlin | CT | Machinery Manufacturing333298 | — | ◇ UNVERIFIED |
| JNJSS Naugatuck, LLC | Naugatuck | CT | Chemical Manufacturing325612 | — | ◇ UNVERIFIED |
| JDJuniper Design Group Inc. | Southington | CT | Electrical Equipment, Appliance & Component Manufacturing335132 | — | ◇ UNVERIFIED |
| KEKace Enterprises LLC | Hamden | CT | Fabricated Metal Product Manufacturing332613 | — | ◇ UNVERIFIED |
| KAK and B Orthodontics LLC | Norwalk | CT | Miscellaneous Manufacturing339116 | — | ◇ UNVERIFIED |
| KKKathies Kitchen LLC | North Haven | CT | Food Manufacturing311812 | — | ◇ UNVERIFIED |
| KMKeeney Manufacturing CO INC | Newington | CT | Fabricated Metal Product Manufacturing332913 | — | ◇ UNVERIFIED |
| KCKemper Corporation | West Haven | CT | Textile Product Mills314999 | — | ◇ UNVERIFIED |
| KLKenneth Lynch & Sons INC | Wilton | CT | Furniture and Related Product Manufacturing337127 | — | ◇ UNVERIFIED |
| KGKeno Graphic Service, INC. | Shelton | CT | Printing and Related Support Activities323111 | — | ◇ UNVERIFIED |
| KIKing Inds INC | Norwalk | CT | Chemical Manufacturing325199 | — | ◇ UNVERIFIED |
| KKKingswood Kitchens INC | Danbury | CT | Furniture and Related Product Manufacturing337110 | — | ◇ UNVERIFIED |
| KFKlotter Farms | Ellington | CT | Wood Product Manufacturing321992 | — | ◇ UNVERIFIED |
| KLKra-ze LLC | Oakdale | CT | Beverage and Tobacco Product Manufacturing312120 | — | ◇ UNVERIFIED |
 KUB Technologies Inc. (111 Research, LLC) | Stratford | CT | Miscellaneous Manufacturing339112 | — | ◇ UNVERIFIED |
| LTLab Threads & Gear Works, INC. | Yalesville | CT | Machinery Manufacturing333512 | — | ◇ UNVERIFIED |
| LJLamarche Jr LLC | Meriden | CT | Food Manufacturing311812 | — | ◇ UNVERIFIED |
| LULamor USA Corporation | Seymour | CT | Machinery Manufacturing333298 | — | ◇ UNVERIFIED |
| LFLatex Foam International LLC | Shelton | CT | Plastics and Rubber Products Manufacturing326299 | — | ◇ UNVERIFIED |
| LFLatex Foam Intl | Shelton | CT | Plastics and Rubber Products Manufacturing326299 | — | ◇ UNVERIFIED |
