| COBALT GENERAL STORE, INCORPORATEDCobalt, CT · Dissolved | Cobalt, CT | Corporation | Aug 17, 1959 | Dissolved |
| Z INCORPORATEDCobalt, CT · Active | Cobalt, CT | Corporation | Jul 1, 1968 | Active |
| JAMES COMPANY, INC. THECobalt, CT · Dissolved | Cobalt, CT | Corporation | Jul 15, 1981 | Dissolved |
| TECH-ONE, INC.Cobalt, CT · Dissolved | Cobalt, CT | Corporation | Dec 16, 1991 | Dissolved |
| 3 G MANAGEMENT COMPANY, L.L.C.Cromwell, CT · Dissolved | Cromwell, CT | LLC | Apr 13, 1995 | Dissolved |
| SIX C'S, L.L.C.Cromwell, CT · Dissolved | Cromwell, CT | LLC | Oct 27, 1995 | Dissolved |
| MIDDLESEX COUNTY FIRE CHIEFS ASSOCIATION, INC.Cobalt, CT · Active | Cobalt, CT | Corporation | Dec 9, 1996 | Active |
| DIAMOND NET ENTERPRISES, LLCCobalt, CT · Forfeited | Cobalt, CT | LLC | Jul 28, 1998 | Forfeited |
| ROCKWOOD ABSTRACT, LLCCoblat, CT · Dissolved | Coblat, CT | LLC | May 3, 1999 | Dissolved |
| RAY'S FURNITURE MART, LLCCobalt, CT · Dissolved | Cobalt, CT | LLC | Aug 31, 1999 | Dissolved |
| MAJESKI ASSOCIATES, LLCCobalt, CT · Forfeited | Cobalt, CT | LLC | May 29, 2001 | Forfeited |
| SPARROW DESIGN, LLCCobalt, CT · Dissolved | Cobalt, CT | LLC | Mar 11, 2002 | Dissolved |
| STARR BUILDERS, LLCCobalt, CT · Active | Cobalt, CT | LLC | Apr 25, 2002 | Active |
| TRANQUIL GARDENS LLCCobalt, CT · Dissolved | Cobalt, CT | LLC | Aug 27, 2003 | Dissolved |
| WASHINGTON RIVER MANAGEMENT, LLCCobalt, CT · Active | Cobalt, CT | LLC | Jan 8, 2004 | Active |
| SODEL GENERAL CONTRACTING, LLCCobalt, CT · Forfeited | Cobalt, CT | LLC | Mar 11, 2004 | Forfeited |
| THE AIR AND SPACE CLUB, INC.Cobalt, CT · Forfeited | Cobalt, CT | Corporation | Jul 22, 2005 | Forfeited |
| WOLFYZ ROLLOFFS L.L.C.Cobalt, CT · Forfeited | Cobalt, CT | LLC | Mar 14, 2006 | Forfeited |
| JEWEL BAGS, LLCCobalt, CT · Active | Cobalt, CT | LLC | Apr 26, 2006 | Active |
| TC CONCRETE CO LLCCobalt, CT · Forfeited | Cobalt, CT | LLC | Aug 29, 2006 | Forfeited |
| COZY PANTS, LLCCobalt, CT · Dissolved | Cobalt, CT | LLC | Jan 2, 2007 | Dissolved |
| BIG DEVELOPMENT, L.L.C.Stratford, CT · Forfeited | Stratford, CT | LLC | Sep 11, 2007 | Forfeited |
| CHATHAM RESTORATIONS LLCCobalt, CT · Dissolved | Cobalt, CT | LLC | Nov 8, 2007 | Dissolved |
| CHATHAM REALTY ENTERPRISES 11 SKINNER STREET, LLCCobalt, CT · Dissolved | Cobalt, CT | LLC | Oct 14, 2008 | Dissolved |
| COBALT QUICK MART LLCCobalt, CT · Forfeited | Cobalt, CT | LLC | Nov 13, 2008 | Forfeited |
| CAITIE SHANE TRANSPORTATION, LLCCobalt, CT · Dissolved | Cobalt, CT | LLC | Jun 9, 2009 | Dissolved |
| TAILOR QUALITY IN HOME CARE LLCClinton, CT · Forfeited | Clinton, CT | LLC | Jun 18, 2010 | Forfeited |
| HFH ACQUISITIONS LLCCobalt, CT · Active | Cobalt, CT | LLC | Aug 23, 2010 | Active |
| BIG TOM'S AND SONS LLCCobalt, CT · Forfeited | Cobalt, CT | LLC | Feb 8, 2011 | Forfeited |
| TWENTY-FOUR PEACE LLCCobalt, CT · Active | Cobalt, CT | LLC | Mar 8, 2011 | Active |
| HEMLOCK HILL ASSOCIATESCobalt, CT · Recorded | Cobalt, CT | Partnership | Sep 14, 2011 | Recorded |
| STATEWIDE DIESEL SERVICE, LLCCobalt, CT · Dissolved | Cobalt, CT | LLC | May 9, 2012 | Dissolved |
| RAY'S TRUCKING COBALT LLCCobalt, CT · Forfeited | Cobalt, CT | LLC | Oct 24, 2012 | Forfeited |
| CONNECTICUT RIVER MARINE LLCCobalt, CT · Active | Cobalt, CT | LLC | Apr 15, 2013 | Active |
| SNOWBOOTY LLCCobalt, CT · Dissolved | Cobalt, CT | LLC | Jun 18, 2013 | Dissolved |
| 526 HIGH STREET, LLCCobalt, CT · Active | Cobalt, CT | LLC | Feb 10, 2014 | Active |
| 1360 MAIN STREET, LLCCobalt, CT · Active | Cobalt, CT | LLC | Feb 10, 2014 | Active |
| BLUMENTHAL & DONAHUE INSURANCE, LLCCobalt, CT · Forfeited | Cobalt, CT | LLC | Mar 2, 2015 | Forfeited |
| JCG PROPERTIES, LLCCobalt, CT · Active | Cobalt, CT | LLC | Jul 6, 2015 | Active |
| Cobalt Veterinary Clinic LLCCobalt, CT · Active | Cobalt, CT | LLC | Jul 6, 2015 | Active |
| DZ & SONS LLCCobalt, CT · Active | Cobalt, CT | LLC | Jul 16, 2015 | Active |
| 690 WASHINGTON STREET, LLCCobalt, CT · Active | Cobalt, CT | LLC | Aug 24, 2015 | Active |
| K LAMAY'S STEAMED CHEESEBURGER II, LLCCobalt, CT · Forfeited | Cobalt, CT | LLC | Nov 13, 2015 | Forfeited |
| KNEELAND COTTAGE, LLCCobalt, CT · Dissolved | Cobalt, CT | LLC | Jan 7, 2016 | Dissolved |
| HILLSIDE INVESTMENTS, LLCCobalt, CT · Active | Cobalt, CT | LLC | Jul 1, 2016 | Active |
| LUCKY COBALT, LLCCobalt, CT · Dissolved | Cobalt, CT | LLC | Nov 26, 2018 | Dissolved |
| TWIN OAK SERVICES LLCCobalt, CT · Active | Cobalt, CT | LLC | May 11, 2020 | Active |
| APPALACHIAN FORESIGHT LLCCobalt, CT · Forfeited | Cobalt, CT | LLC | Aug 28, 2020 | Forfeited |
| Beets & Blooms Farm LLCEast Hampton, CT · Forfeited | East Hampton, CT | LLC | May 11, 2022 | Forfeited |
| 368 WEST HIGH STREET LLCEast Hampton, CT · Active | East Hampton, CT | LLC | Oct 12, 2022 | Active |