| HMHurley Metal Fabrication & Mfg, LLC | Windsor | — | ◇ UNVERIFIED |
 Hydro Honing Laboratories | East Hartford | — | ◇ UNVERIFIED |
| IIIda Installations, INC. | Southington | — | ◇ UNVERIFIED |
| IFIdeal Forging CORP | Southington | — | ◇ UNVERIFIED |
| ISImperial Spring Manfuacturing, LLC | Bristol | — | ◇ UNVERIFIED |
| IMIndependent Metalworx, Inc. | Ansonia | — | ◇ UNVERIFIED |
| IMIndependent Metalworx, Inc. | Ansonia | — | ◇ UNVERIFIED |
| IHInfinity Holdings Company LLC | Terryville | — | ◇ UNVERIFIED |
| ISInfinity Stone, INC. | Waterbury | — | ◇ UNVERIFIED |
| ISInfinity Surfacing & Refinishing LLC | Terryville | — | ◇ UNVERIFIED |
| ILIron&Oak LLC | Bethel | — | ◇ UNVERIFIED |
| JMJared Manufacturing CO. INC. | Norwalk | — | ◇ UNVERIFIED |
| JWJarosz Welding CO. INC. | Hartford | — | ◇ UNVERIFIED |
| JMJC Mectec, LLC | Stratford | — | ◇ UNVERIFIED |
| JOJ. O'connor, LLC | Newington | — | ◇ UNVERIFIED |
| JIJoma, INC. | Waterbury | — | ◇ UNVERIFIED |
 Joval Machine Co., INC. | Wallingford | — | ◇ UNVERIFIED |
| KEKace Enterprises LLC | Hamden | — | ◇ UNVERIFIED |
| KCKaman Corporation | Middletown | — | ◇ UNVERIFIED |
| KIKaste Industrial Machine Sales, Inc. | Enfield | — | ◇ UNVERIFIED |
| KMKeeney Manufacturing CO INC | Newington | — | ◇ UNVERIFIED |
| KMKovil Manufacturing, LLC | Cheshire | — | ◇ UNVERIFIED |
| LCLee CO the | Westbrook | — | ◇ UNVERIFIED |
| LML & M Manufacturing Company, INC. | New Hartford | — | ◇ UNVERIFIED |
| LWL. W. Seecamp Company, INC. | Milford | — | ◇ UNVERIFIED |
| MAManaged Air Systems | Plantsville | — | ◇ UNVERIFIED |
| MFMarlin Firearms CO | North Haven | — | ◇ UNVERIFIED |
 Marsam Metal Finishing Company, INC. | New Britain | — | ◇ UNVERIFIED |
| MPMdm Products, LLC | Milford | — | ◇ UNVERIFIED |
| MMMeadow Manufacturing, Inc. | Berlin | — | ◇ UNVERIFIED |
| MMMega Mechanical Services, LLC | Glastonbury | — | ◇ UNVERIFIED |
| MPMelting Point Welding & Fabrication, Inc. | Killingly | — | ◇ UNVERIFIED |
| MLMetalCraft LLC | Bantam | — | ◇ UNVERIFIED |
| MFMetal Finishing Techs INC | Forestville | — | ◇ UNVERIFIED |
| MPMetallurgical Processing, INC. | New Britain | — | ◇ UNVERIFIED |
| MLMetalpro LLC | Old Saybrook | — | ◇ UNVERIFIED |
| MLM-fab LLC | Torrington | — | ◇ UNVERIFIED |
| MCMicrofab Company LLC | Oxford | — | ◇ UNVERIFIED |
| MMMicro Matic, INC. | Naugatuck | — | ◇ UNVERIFIED |
| MLMidget Louver | Milford | — | ◇ UNVERIFIED |
| MMMikco Manufacturing Technology, INC. | Wallingford | — | ◇ UNVERIFIED |
| MAMilford Automatics INC | Milford | — | ◇ UNVERIFIED |
| MPMirror Polishing & Plating CO INC | Waterbury | — | ◇ UNVERIFIED |
| MCMontec Corporation | Glastonbury | — | ◇ UNVERIFIED |
| MCMott Corporation | Farmington | — | ◇ UNVERIFIED |
| MRM & R Manufacturing Inc. | Newington | — | ◇ UNVERIFIED |
| MIMw Industries, INC. | Waterbury | — | ◇ UNVERIFIED |
| MIMw Industries, INC Dba Raf Electronic Hardware | Seymour | — | ◇ UNVERIFIED |
| NENational Eastern Corporation | Plainville | — | ◇ UNVERIFIED |
| NSNational Sintered Alloys Incorporated | Clinton | — | ◇ UNVERIFIED |
