| RSResin Solutions LLC (formerly Total Petrochemical and Refining) | Stratford | CT | Chemical Manufacturing325199 | — | ◇ UNVERIFIED |
| RBResonetics Bethel 111 | Bethel | CT | Miscellaneous Manufacturing339112 | — | ◇ UNVERIFIED |
| RBReverie Brewing Company LLC | Newtown | CT | Beverage and Tobacco Product Manufacturing312120 | — | ◇ UNVERIFIED |
| RGR & G Carting & Recycling, LLC | Southington | CT | Chemical Manufacturing325199 | — | ◇ UNVERIFIED |
| RMRichard Montanari Jr. | North Haven | CT | Plastics and Rubber Products Manufacturing326199 | — | ◇ UNVERIFIED |
| RRRichard Roder | East Hartford | CT | Miscellaneous Manufacturing339991 | — | ◇ UNVERIFIED |
| RIRimar, INC. | Cheshire | CT | Printing and Related Support Activities323111 | — | ◇ UNVERIFIED |
| RMRios Machine & Tool | Shelton | CT | Machinery Manufacturing333517 | — | ◇ UNVERIFIED |
| RTRist/ama Truck Terminal | North Branford | CT | Chemical Manufacturing325180 | — | ◇ UNVERIFIED |
| RSRocktenn (formerly Smurfit-stone Container Corp) | Uncasville | CT | Paper Manufacturing322130 | — | ◇ UNVERIFIED |
| RTRock Tenn Merchandizing Design | Bethel | CT | Miscellaneous Manufacturing339950 | — | ◇ UNVERIFIED |
| RCRogers CORP Willimantic | South Windham | CT | Plastics and Rubber Products Manufacturing326291 | — | ◇ UNVERIFIED |
| RMRogers Manufacturing Company | Middlefield | CT | Plastics and Rubber Products Manufacturing326199 | — | ◇ UNVERIFIED |
| RPRollprint Packaging Prods INC | Bloomfield | CT | Paper Manufacturing322220 | — | ◇ UNVERIFIED |
| RERose Enterprises, LLC | Cheshire | CT | Food Manufacturing311812 | — | ◇ UNVERIFIED |
| RMRose Mill Holdings LLC | Windsor Locks | CT | Chemical Manufacturing325998 | — | ◇ UNVERIFIED |
| RRRoss & Roberts INC | Stratford | CT | Chemical Manufacturing325211 | — | ◇ UNVERIFIED |
| RTRostra Tool Company, INC. | Branford | CT | Fabricated Metal Product Manufacturing332212 | — | ◇ UNVERIFIED |
| RWRoyal Woodcraft LLC | Ansonia | CT | Furniture and Related Product Manufacturing337110 | — | ◇ UNVERIFIED |
| RPR. Piro Electric, LLC | Trumbull | CT | Electrical Equipment, Appliance & Component Manufacturing335932 | — | ◇ UNVERIFIED |
| RRR & R Corrugated Container, INC. | Bristol | CT | Paper Manufacturing322211 | — | ◇ UNVERIFIED |
| RCRS Commercial Real Estate, LLC | Danielson | CT | Fabricated Metal Product Manufacturing332710 | — | ◇ UNVERIFIED |
| RLRWP, Limited Liability Company | Madison | CT | Fabricated Metal Product Manufacturing332710 | — | ◇ UNVERIFIED |
| SKSafety Kleen a Clean Harbors Company | Portland | CT | Chemical Manufacturing325998 | — | ◇ UNVERIFIED |
| SPSaint-gobain Ppl CORP | New Haven | CT | Paper Manufacturing322220 | — | ◇ UNVERIFIED |
| SMSalamon Manufacturing, INC. | New Britain | CT | Fabricated Metal Product Manufacturing332710 | — | ◇ UNVERIFIED |
| SFSamsara Fitness LLC | Chester | CT | Miscellaneous Manufacturing339920 | — | ◇ UNVERIFIED |
| STSatellite Tool and Machine Co., INC. | South Windsor | CT | Transportation Equipment Manufacturing336412 | — | ◇ UNVERIFIED |
 Sca Pharmaceuticals LLC | Windsor | CT | Chemical Manufacturing325412 | — | ◇ UNVERIFIED |
| SIScb International | Newtown | CT | Computer and Electronic Product Manufacturing334513 | — | ◇ UNVERIFIED |
| SESchneiderelectric Ecofit | North Haven | CT | Electrical Equipment, Appliance & Component Manufacturing335313 | — | ◇ UNVERIFIED |
| SASealed Air CORP - Bethel | Bethel | CT | Plastics and Rubber Products Manufacturing326111 | — | ◇ UNVERIFIED |
| SLSereka LLC | Cos Cob | CT | Textile Product Mills314999 | — | ◇ UNVERIFIED |
| SCSerious Coffee LLC | Meriden | CT | Food Manufacturing311920 | — | ◇ UNVERIFIED |
| SLSerrandipity LLC | Rockfall | CT | Food Manufacturing311520 | — | ◇ UNVERIFIED |
| S1Seven 1 Studios LLC | Woodbury | CT | Printing and Related Support Activities323113 | — | ◇ UNVERIFIED |
| SLShelter Logic (formerly Coats North America) | Watertown | CT | Textile Mills313113 | — | ◇ UNVERIFIED |
| SPShore Power, INC. | Old Saybrook | CT | Electrical Equipment, Appliance & Component Manufacturing335911 | — | ◇ UNVERIFIED |
| SESiftex Equipment Company | South Windsor | CT | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| SSSimoniz Saniclean, LLC | Rocky Hill | CT | Chemical Manufacturing325611 | — | ◇ UNVERIFIED |
| SSSimpson Strong-tie Company, INC. | Enfield | CT | Fabricated Metal Product Manufacturing332510 | — | ◇ UNVERIFIED |
| SPSix Paca Farm, LLC | Bozrah | CT | Textile Mills313110 | — | ◇ UNVERIFIED |
| SSSolar Seal of Connecticut | Hamden | CT | Nonmetallic Mineral Product Manufacturing327211 | — | ◇ UNVERIFIED |
| SPSolidification Products International, INC | North Haven | CT | Fabricated Metal Product Manufacturing332999 | — | ◇ UNVERIFIED |
| SISoltec, INC. | Bethel | CT | Chemical Manufacturing325212 | — | ◇ UNVERIFIED |
| SSSomething Sweet, INC. | New Haven | CT | Food Manufacturing311812 | — | ◇ UNVERIFIED |
| SPSonoco Protective Solutions, INC | Putnam | CT | Plastics and Rubber Products Manufacturing326199 | — | ◇ UNVERIFIED |
| SVSound View Plastics, LLC | Westbrook | CT | Plastics and Rubber Products Manufacturing326199 | — | ◇ UNVERIFIED |
| SMSpace-craft Manufacturing, INC. | New Haven | CT | Transportation Equipment Manufacturing336412 | — | ◇ UNVERIFIED |
| SESpace Exploration Technologies CORP | Bloomfield | CT | Transportation Equipment Manufacturing336414 | — | ◇ UNVERIFIED |
