| SISmartcap Innovations, LLC | West Hartford | CT | Electrical Equipment, Appliance & Component Manufacturing335139 | — | ◐ LIKELY ACTIVE |
| SSSolar Shield, LLC | Milldale | CT | Furniture and Related Product Manufacturing337920 | — | ◐ LIKELY ACTIVE |
| SGSolenoid Group | Westbrook | CT | Fabricated Metal Product Manufacturing332911 | 100-499 | ◐ LIKELY ACTIVE |
| SPSolventum Purification Inc | Stafford Springs | CT | Machinery Manufacturing333999 | 100-499 | ◐ LIKELY ACTIVE |
| S1SoNo 1420 America's Maritime Distillery | Norwalk | CT | Beverage and Tobacco Product Manufacturing312140 | — | ◐ LIKELY ACTIVE |
| SISorge Industries, INC. | Shelton | CT | Fabricated Metal Product Manufacturing332999 | — | ◐ LIKELY ACTIVE |
| SPSpecialty Printing | Windsor | CT | Printing and Related Support Activities323111 | 100-499 | ◐ LIKELY ACTIVE |
| SSSpecialty Saw inc | Simsbury | CT | Fabricated Metal Product Manufacturing332216 | 20-99 | ◐ LIKELY ACTIVE |
Specialty Steel Treating - CT | East Granby | CT | Fabricated Metal Product Manufacturing332811 | 20-99 | ◐ LIKELY ACTIVE |
| S4Spectrum 440 | Milford | CT | Transportation Equipment Manufacturing336413 | 1-19 | ◐ LIKELY ACTIVE |
| SASpectrum Associates, INC. | Milford | CT | Computer and Electronic Product Manufacturing334419 | — | ◐ LIKELY ACTIVE |
Springfield Spring Corporation - CT | Bristol | CT | Fabricated Metal Product Manufacturing332613 | 20-99 | ◐ LIKELY ACTIVE |
| SHSpring Hill Vineyards | New Preston | CT | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |
| STSpringworks Therapeutics, INC. | Stamford | CT | Chemical Manufacturing325412 | — | ◐ LIKELY ACTIVE |
| SISpv Industries LLC | West Hartford | CT | Fabricated Metal Product Manufacturing332710 | — | ◐ LIKELY ACTIVE |
| SMSsi Manufacturing Technologies CORP. | Bristol | CT | Fabricated Metal Product Manufacturing332710 | — | ◐ LIKELY ACTIVE |
| SMSSI Mfg | Bristol | CT | Fabricated Metal Product Manufacturing332710 | 20-99 | ◐ LIKELY ACTIVE |
| SFStaehly Farm Winery | E. Haddam | CT | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |
| SCStafford Cidery LLC | Stafford Springs | CT | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |
| SStamford | Stamford | CT | Chemical Manufacturing325611 | 1-19 | ◐ LIKELY ACTIVE |
| SBStanley Black & Decker, INC. | New Britain | CT | Fabricated Metal Product Manufacturing332439 | — | ◐ LIKELY ACTIVE |
| SWStanley Wiesen, INC. | Hartford | CT | Fabricated Metal Product Manufacturing332321 | — | ◐ LIKELY ACTIVE |
| SVStappa Vineyard | Orange | CT | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |
| SSStatic Safe Products CO | Cornwall Bridge | CT | Fabricated Metal Product Manufacturing332999 | — | ◐ LIKELY ACTIVE |
| SFSteadfast Farms Poultry Processing & Slaughter LLC | Bethlehem | CT | Food Manufacturing311615 | — | ◐ LIKELY ACTIVE |
| SOStech of Manchester, LLC | Manchester | CT | Miscellaneous Manufacturing339950 | — | ◐ LIKELY ACTIVE |
| SMSterling Medical LLC | Milford | CT | Miscellaneous Manufacturing339112 | — | ◐ LIKELY ACTIVE |
| SEStewart EFI CT Warehouse | Thomaston | CT | Fabricated Metal Product Manufacturing332119 | 1-19 | ◐ LIKELY ACTIVE |
| SGStone Gardens Farm | Shelton | CT | Food Manufacturing311612 | — | ◐ LIKELY ACTIVE |
| SVStonington Vineyards | Stonington | CT | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |
| SCStratford Connecticut | Stratford | CT | Computer and Electronic Product Manufacturing334513 | 100-499 | ◐ LIKELY ACTIVE |
| Ssuffield | Suffield | CT | Chemical Manufacturing325120 | 20-99 | ◐ LIKELY ACTIVE |
| SSSunbelt Solomon Services-CTMT | Middleton | CT | Electrical Equipment, Appliance & Component Manufacturing335311 | 20-99 | ◐ LIKELY ACTIVE |
| SHSunset Hill Vineyard | Lyme | CT | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |
| SMSunset Meadow Vineyards | Goshen | CT | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |
| SFSunshine Farm Distillery | Wallingford | CT | Beverage and Tobacco Product Manufacturing312140 | — | ◐ LIKELY ACTIVE |
| SSSuperb Steel, LLC | New Britain | CT | Miscellaneous Manufacturing339999 | — | ◐ LIKELY ACTIVE |
| SLSupermill, LLC | Berlin | CT | Machinery Manufacturing333515 | 20-99 | ◐ LIKELY ACTIVE |
| STSwanson Tool Mfg, Inc. | Elmwood | CT | Machinery Manufacturing333515 | 20-99 | ◐ LIKELY ACTIVE |
| SSSynnott Systems, INC | Plainfield | CT | Printing and Related Support Activities323111 | — | ◐ LIKELY ACTIVE |
| TBTaylor Brooke Winery | Woodstock | CT | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |
| TGTechnical Gas Products, INC. | Wallingford | CT | Chemical Manufacturing325120 | — | ◐ LIKELY ACTIVE |
| TLTeleflex LLC (Coventry) | Coventry | CT | Miscellaneous Manufacturing339112 | 20-99 | ◐ LIKELY ACTIVE |
| TCTerex Corporation | Norwalk | CT | Machinery Manufacturing333120 | 20-99 | ◐ LIKELY ACTIVE |
| TCThe Cidery at Averill Farm, LLC | Washington Depot | CT | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |
| TCThe Colt's Plastics Company, Inc. | Dayville | CT | Plastics and Rubber Products Manufacturing326199 | 20-99 | ◐ LIKELY ACTIVE |
The Cooper Group LLC | North Stonington | CT | Wood Product Manufacturing321911 | 20-99 | ◐ LIKELY ACTIVE |
| THThe H R Hillery Company | Groton | CT | Fabricated Metal Product Manufacturing332312 | — | ◐ LIKELY ACTIVE |
| TPThe Phoenix Company | Naugatuck | CT | Electrical Equipment, Appliance & Component Manufacturing335931 | 1-19 | ◐ LIKELY ACTIVE |
| TCThermatool Corp | East Haven | CT | Machinery Manufacturing333992 | 20-99 | ◐ LIKELY ACTIVE |