| LJLawrence Jakes, Jr. | Pomfret Center | CT | Wood Product Manufacturing321918 | — | ◇ UNVERIFIED |
| LKLescare Kitchens | Southington | CT | Furniture and Related Product Manufacturing337110 | — | ◇ UNVERIFIED |
| LILesro Industries INC | Bloomfield | CT | Furniture and Related Product Manufacturing337125 | — | ◇ UNVERIFIED |
 Linemaster Switch Corporation | Plainfield | CT | Electrical Equipment, Appliance & Component Manufacturing335314 | — | ◇ UNVERIFIED |
| LTLisbon Textile Prints INC | Lisbon | CT | Textile Mills313310 | — | ◇ UNVERIFIED |
| LSLiz Sue Bagels, INC. | Stamford | CT | Food Manufacturing311811 | — | ◇ UNVERIFIED |
| LML & M Manufacturing Company, INC. | New Hartford | CT | Fabricated Metal Product Manufacturing332611 | — | ◇ UNVERIFIED |
| LCLNA Corp. | Glastonbury | CT | Chemical Manufacturing325611 | — | ◇ UNVERIFIED |
| LSLocknetics Security Eng | Forestville | CT | Electrical Equipment, Appliance & Component Manufacturing335999 | — | ◇ UNVERIFIED |
| LSLocknetics Security Engineering | Bristol | CT | Computer and Electronic Product Manufacturing334119 | — | ◇ UNVERIFIED |
| LOLove On Creations LLC | Stamford | CT | Apparel Manufacturing315250 | — | ◇ UNVERIFIED |
| LLLowcountry Legacy Ventures LLC | Shelton | CT | Computer and Electronic Product Manufacturing334417 | — | ◇ UNVERIFIED |
| LSL Suzio Concrete Company | Milford | CT | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| LCLunker City Fishing Specialties | Meriden | CT | Miscellaneous Manufacturing339920 | — | ◇ UNVERIFIED |
| LWL. W. Seecamp Company, INC. | Milford | CT | Fabricated Metal Product Manufacturing332994 | — | ◇ UNVERIFIED |
| MBMachine Builders of New England, LLC | Shelton | CT | Machinery Manufacturing333517 | — | ◇ UNVERIFIED |
| MLMacyop LLC | East Lyme | CT | Miscellaneous Manufacturing339113 | — | ◇ UNVERIFIED |
| MAManaged Air Systems | Plantsville | CT | Fabricated Metal Product Manufacturing332322 | — | ◇ UNVERIFIED |
| MMManchester Molding & Mfg. Co., INC. | Manchester | CT | Plastics and Rubber Products Manufacturing326199 | — | ◇ UNVERIFIED |
| MIMarena Industries | East Hartford | CT | Machinery Manufacturing333515 | — | ◇ UNVERIFIED |
| MFMarlin Firearms CO | North Haven | CT | Fabricated Metal Product Manufacturing332994 | — | ◇ UNVERIFIED |
 Marsam Metal Finishing Company, INC. | New Britain | CT | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| MGMarty Gilman, INC. | Bozrah | CT | Miscellaneous Manufacturing339920 | — | ◇ UNVERIFIED |
 Material Handling Systems, INC. | Middletown | CT | Machinery Manufacturing333120 | — | ◇ UNVERIFIED |
| MAMaurer and Shepherd, Joyners, INC. | Glastonbury | CT | Furniture and Related Product Manufacturing337212 | — | ◇ UNVERIFIED |
| MAMaybury Associates, INC. | Windsor | CT | Machinery Manufacturing333924 | — | ◇ UNVERIFIED |
| MMMCB Marine LLC | Sherman | CT | Transportation Equipment Manufacturing336611 | — | ◇ UNVERIFIED |
| MLMcBraaten, LLC | Woodstock | CT | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| MLMccoy Ltd, LLC | Torrington | CT | Printing and Related Support Activities323111 | — | ◇ UNVERIFIED |
| MPMdm Products, LLC | Milford | CT | Fabricated Metal Product Manufacturing332311 | — | ◇ UNVERIFIED |
| MMMega Mechanical Services, LLC | Glastonbury | CT | Fabricated Metal Product Manufacturing332322 | — | ◇ UNVERIFIED |
| MPMelting Point Welding & Fabrication, Inc. | Killingly | CT | Fabricated Metal Product Manufacturing332323 | — | ◇ UNVERIFIED |
| MFMetal Finishing Techs INC | Forestville | CT | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| MPMetallurgical Processing, INC. | New Britain | CT | Fabricated Metal Product Manufacturing332811 | — | ◇ UNVERIFIED |
| MMMetamorphic Materials INC | Winsted | CT | Chemical Manufacturing325211 | — | ◇ UNVERIFIED |
| MGM & G Jewelers, INC. | South Windsor | CT | Miscellaneous Manufacturing339913 | — | ◇ UNVERIFIED |
| MRM.h. Rhodes Cramer Company | South Windsor | CT | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| MMMicro Matic, INC. | Naugatuck | CT | Fabricated Metal Product Manufacturing332116 | — | ◇ UNVERIFIED |
| MLMidget Louver | Milford | CT | Fabricated Metal Product Manufacturing332322 | — | ◇ UNVERIFIED |
| MMMid-state Manufacturing | Milldale | CT | Machinery Manufacturing333515 | — | ◇ UNVERIFIED |
| MPMigabri Properties LLC | Vernon Rockville | CT | Miscellaneous Manufacturing339116 | — | ◇ UNVERIFIED |
| MMMikco Manufacturing Technology, INC. | Wallingford | CT | Fabricated Metal Product Manufacturing332721 | — | ◇ UNVERIFIED |
| MAMilford Automatics INC | Milford | CT | Fabricated Metal Product Manufacturing332721 | — | ◇ UNVERIFIED |
| MMMinteq/specialty Minerals INC | North Canaan | CT | Primary Metal Manufacturing331491 | — | ◇ UNVERIFIED |
| MWMK Wood Cabinetry | Plainfield | CT | Furniture and Related Product Manufacturing337110 | — | ◇ UNVERIFIED |
| MBModern Bakery LLC | Meriden | CT | Food Manufacturing311811 | — | ◇ UNVERIFIED |
| MCModern Cabinets LLC | Bristol | CT | Furniture and Related Product Manufacturing337110 | — | ◇ UNVERIFIED |
| MIMohawk Industries, INC. | Torrington | CT | Textile Product Mills314129 | — | ◇ UNVERIFIED |
| MVMohican Valley Concrete Corporation, the | Fairfield | CT | Nonmetallic Mineral Product Manufacturing327331 | — | ◇ UNVERIFIED |
| MCMontec Corporation | Glastonbury | CT | Fabricated Metal Product Manufacturing332111 | — | ◇ UNVERIFIED |
