| HSHartford Satellite | Windsor | CT | Electrical Equipment, Appliance & Component Manufacturing335313 | 20-99 | ◐ LIKELY ACTIVE |
| HHeadquarters | Stamford | CT | Furniture and Related Product Manufacturing337920 | 20-99 | ◐ LIKELY ACTIVE |
| HFHeartstone Farm & Winery, LLC | Columbia | CT | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |
| HTHeritage Trail Vineyards INC. | Lisbon | CT | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |
| HLHickory Ledges Farm | Canton | CT | Beverage and Tobacco Product Manufacturing312140 | — | ◐ LIKELY ACTIVE |
| HYHinckley Yacht Services | Stamford | CT | Transportation Equipment Manufacturing336612 | 1-19 | ◐ LIKELY ACTIVE |
| HSHMF South Windsor | South Windsor | CT | Food Manufacturing311612 | 1-19 | ◐ LIKELY ACTIVE |
| HMHobson & Motzer, LLC - Wallingford | Wallingford | CT | Machinery Manufacturing333514 | 20-99 | ◐ LIKELY ACTIVE |
| HCHogans Cider Mill | Burlington | CT | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |
| HOHolmberg Orchards | Gales Ferry | CT | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |
| HCHoney Cell Inc | Shelton | CT | Paper Manufacturing322211 | 20-99 | ◐ LIKELY ACTIVE |
| HWHowmet - Winsted | Winsted | CT | Fabricated Metal Product Manufacturing332710 | 100-499 | ◐ LIKELY ACTIVE |
| HHHP Hood Ice Cream Division | Suffield | CT | Food Manufacturing311520 | 100-499 | ◐ LIKELY ACTIVE |
| HPH&s Prototyping INC. | Bridgeport | CT | Fabricated Metal Product Manufacturing332312 | — | ◐ LIKELY ACTIVE |
| HGHydro Group Systems INC | Waterford | CT | Electrical Equipment, Appliance & Component Manufacturing335929 | — | ◐ LIKELY ACTIVE |
| HSHydro Service & Supplies, INC. | Middletown | CT | Machinery Manufacturing333310 | — | ◐ LIKELY ACTIVE |
| ISi2Systems S2 | Watertown | CT | Electrical Equipment, Appliance & Component Manufacturing335122 | 20-99 | ◐ LIKELY ACTIVE |
| ISIannucci Spirits, LLC | North Haven | CT | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |
| IGIMH Group | Westbrook | CT | Fabricated Metal Product Manufacturing332911 | 100-499 | ◐ LIKELY ACTIVE |
| ILIMIA, LLC Groton | Groton | CT | Transportation Equipment Manufacturing336611 | 20-99 | ◐ LIKELY ACTIVE |
| IMIndustrial Metal Works LLC | Newtown | CT | Fabricated Metal Product Manufacturing332312 | — | ◐ LIKELY ACTIVE |
| IIItalia Importing Company | New Haven | CT | Food Manufacturing311612 | — | ◐ LIKELY ACTIVE |
| JVJacobs Vehicle Systems | Bloomfield, CT | CT | Transportation Equipment Manufacturing336390 | 100-499 | ◐ LIKELY ACTIVE |
| JFJeffco Foam Woodstock | Woodstock | CT | Furniture and Related Product Manufacturing337910 | 100-499 | ◐ LIKELY ACTIVE |
| JWJerram Winery | New Hartford | CT | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |
| JJJJ & J Custom Home | Brookfield | CT | Textile Product Mills314999 | 1-19 | ◐ LIKELY ACTIVE |
| JDJohn Downey Drive | New Britain | CT | Chemical Manufacturing325612 | 20-99 | ◐ LIKELY ACTIVE |
| JLJonal Labs Logistics, LLC | Meriden | CT | Transportation Equipment Manufacturing336411 | — | ◐ LIKELY ACTIVE |
| JEJonathan Edwards Winery | North Stonington | CT | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |
| JFJones Family Farms Winery | Shelton | CT | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |
| KAKaman Aerospace Corporation | Bloomfield | CT | Transportation Equipment Manufacturing336411 | — | ◐ LIKELY ACTIVE |
| KPKamps Pallets - Bloomfield | Bloomfield | CT | Wood Product Manufacturing321920 | 20-99 | ◐ LIKELY ACTIVE |
| KRKawasaki Rail Car Inc - New Haven | New Haven | CT | Transportation Equipment Manufacturing336510 | 20-99 | ◐ LIKELY ACTIVE |
| KFKibberia Foods LLC | Danbury | CT | Food Manufacturing311612 | — | ◐ LIKELY ACTIVE |
| KPKillingly Plant | Dayville | CT | Food Manufacturing311919 | 500+ | ◐ LIKELY ACTIVE |
| KDKing, David W | Hampton | CT | Nonmetallic Mineral Product Manufacturing327215 | — | ◐ LIKELY ACTIVE |
| KOKingdom of the Hawk | North Stonington | CT | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |
| KAKongsberg Automotive, Suffield FTS | Suffield | CT | Plastics and Rubber Products Manufacturing326220 | 100-499 | ◐ LIKELY ACTIVE |
| LLabCorp | Bloomington | CT | Computer and Electronic Product Manufacturing334516 | 20-99 | ◐ LIKELY ACTIVE |
| LOLand of Nod, LLC | East Canaan | CT | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |
| LLLandola Lakeside Vineyards | Goshen | CT | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |
| LPLaRosa Products | Hartford | CT | Food Manufacturing311612 | — | ◐ LIKELY ACTIVE |
| LILATICRETE International Inc - Bethany | Bethany | CT | Chemical Manufacturing325520 | 100-499 | ◐ LIKELY ACTIVE |
| LGLebanon Green Vineyards | Lebanon | CT | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |
| LSLee Spring Company Bristol CT | Bristol | CT | Fabricated Metal Product Manufacturing332613 | 20-99 | ◐ LIKELY ACTIVE |
| LSLee Spring Company Farmington CT | Farmington | CT | Fabricated Metal Product Manufacturing332613 | 1-19 | ◐ LIKELY ACTIVE |
| LSLee Spring Company Plainville CT | Plainville | CT | Fabricated Metal Product Manufacturing332613 | 1-19 | ◐ LIKELY ACTIVE |
| LSLennox Steel LLC | Trumbull | CT | Fabricated Metal Product Manufacturing332312 | — | ◐ LIKELY ACTIVE |
| LLLightning Luke Distillery | Willington | CT | Beverage and Tobacco Product Manufacturing312140 | — | ◐ LIKELY ACTIVE |
| LMLinde Manchester | Manchester | CT | Fabricated Metal Product Manufacturing332812 | 20-99 | ◐ LIKELY ACTIVE |