| APPALACHIAN VOLUNTEERS INC.Fairfield, CT · Dissolved | Fairfield, CT | Corporation | May 24, 1974 | Dissolved |
| BRANCH TWENTY (20) FLEET RESERVE ASSOCIATION BUILDING INCORPORATEDLocation not reported, CT · Forfeited | Location not reported, CT | Corporation | Sep 22, 1982 | Forfeited |
| MODERN WOMAN, INC.Location not reported, CT · Withdrawn | Location not reported, CT | Corporation | Mar 27, 1984 | Withdrawn |
| LECHTERS CONNECTICUT, INC.Location not reported, CT · Forfeited | Location not reported, CT | Corporation | Jan 30, 1985 | Forfeited |
| FASHION BUG PLUS #8028, INC.Location not reported, CT · Merged | Location not reported, CT | Corporation | Mar 12, 1987 | Merged |
| BIRCHWOOD-CHESHIRE CONDOMINIUM ASSOCIATES, INC.Seymour, CT · Active | Seymour, CT | Corporation | Oct 2, 1987 | Active |
| COSTCO WHOLESALE CORPORATIONLocation not reported, CT · Active | Location not reported, CT | Corporation | Dec 19, 1989 | Active |
| NORWICH REHABILITATION CENTER, INCORPORATEDNorwich, CT · Forfeited | Norwich, CT | Corporation | Feb 14, 1991 | Forfeited |
| FRIENDS OF WEST HAVEN PLAYGROUND, INC.West. Haven, CT · Forfeited | West. Haven, CT | Corporation | Nov 5, 1991 | Forfeited |
| FASHION BUG #2543, INC.Location not reported, CT · Merged | Location not reported, CT | Corporation | Dec 18, 1991 | Merged |
| JMG INSURANCE CORPNorwalk, CT · Active | Norwalk, CT | Corporation | Jan 18, 1994 | Active |
| SULLIVAN BROTHERS REMODELING, L.L.C.Wolcott, CT · Active | Wolcott, CT | LLC | Dec 15, 1995 | Active |
| GREENWICH AUCTION COMPANY LLCGreenwich, CT · Forfeited | Greenwich, CT | LLC | Apr 10, 1997 | Forfeited |
| COSTCO INSURANCE AGENCY, INC.Location not reported, CT · Active | Location not reported, CT | Corporation | Aug 31, 1998 | Active |
| FASHION BUG#3316, INC.Location not reported, CT · Merged | Location not reported, CT | Corporation | Jul 7, 1999 | Merged |
| FASHION BUG #3372, INC.Location not reported, CT · Merged | Location not reported, CT | Corporation | Sep 16, 1999 | Merged |
| DELTA COMPUTER MAINTENANCE, INC.Location not reported, CT · Revoked | Location not reported, CT | Corporation | Jan 13, 2000 | Revoked |
| MOLECULAR STAGING INC.Location not reported, CT · Withdrawn | Location not reported, CT | Corporation | Jun 30, 2000 | Withdrawn |
| A & A OFFICE TECHNOLOGIES, INC.Location not reported, CT · Dissolved | Location not reported, CT | Corporation | Jan 4, 2001 | Dissolved |
| COSTCO WHOLESALE MEMBERSHIP, INC.Location not reported, CT · Active | Location not reported, CT | Corporation | Feb 8, 2001 | Active |
| KITCHEN & BATH ENVIRONMENTS INC.Westport, CT · Forfeited | Westport, CT | Corporation | Sep 6, 2002 | Forfeited |
| RAKG PARTNERS, LLCManchester, CT · Withdrawn | Manchester, CT | LLC | Jan 7, 2005 | Withdrawn |
| COTTON COMMERCIAL USA, INC.Location not reported, CT · Active | Location not reported, CT | Corporation | Feb 11, 2008 | Active |
| JZANUS LTD.Location not reported, CT · Revoked | Location not reported, CT | Corporation | Mar 26, 2008 | Revoked |
| J&M BACKFLOW PREVENTER TESTING LLCNorth Haven, CT · Dissolved | North Haven, CT | LLC | Jan 6, 2009 | Dissolved |
| SUMMERSWEET WOODWORKING, LLCTrumbull, CT · Dissolved | Trumbull, CT | LLC | Nov 19, 2010 | Dissolved |
| EAST COAST STRUCTURES, LLCDarien, CT · Active | Darien, CT | LLC | Jan 18, 2011 | Active |
| BLUESTONE ENERGY SERVICES, LTD.Location not reported, CT · Withdrawn | Location not reported, CT | Corporation | Mar 4, 2011 | Withdrawn |
| 388 EAST MAIN LLCBranford, CT · Active | Branford, CT | LLC | May 6, 2013 | Active |
| OPTERRA ENERGY GROUP, INC.Location not reported, CT · Withdrawn | Location not reported, CT | Corporation | Sep 24, 2014 | Withdrawn |
| VIN860 LLCSuffield, CT · Dissolved | Suffield, CT | LLC | Sep 1, 2015 | Dissolved |
| MH-JS ZELKOVA FUND LLCFairfield, CT · Forfeited | Fairfield, CT | LLC | Dec 22, 2015 | Forfeited |
| COMMUTEAIR LLCLocation not reported, CT · Active | Location not reported, CT | LLC | Jan 19, 2016 | Active |
| BERWICK AVE LLCFairfield, CT · Forfeited | Fairfield, CT | LLC | Jun 24, 2016 | Forfeited |
| FORM CONNECT LLCFairfield, CT · Forfeited | Fairfield, CT | LLC | Aug 25, 2016 | Forfeited |
| 145 BERWICK AVE LLCFairfield, CT · Forfeited | Fairfield, CT | LLC | Dec 5, 2016 | Forfeited |
| ROCK ON LLCFairfield, CT · Forfeited | Fairfield, CT | LLC | Dec 5, 2016 | Forfeited |
| COSTCO HEALTH SOLUTIONS, INC.Location not reported, CT · Withdrawn | Location not reported, CT | Corporation | Oct 4, 2017 | Withdrawn |
| SHUTT-R LLCClinton, CT · Forfeited | Clinton, CT | LLC | Apr 5, 2018 | Forfeited |
| CENTER OF EXCELLENCE, LLCWallingford, CT · Dissolved | Wallingford, CT | LLC | Apr 18, 2018 | Dissolved |
| FORENSIC HEALTH SERVICES, LLCLocation not reported, CT · Active | Location not reported, CT | LLC | Jan 25, 2019 | Active |
| MHM HEALTH PROFESSIONALS, LLCLocation not reported, CT · Active | Location not reported, CT | LLC | Feb 5, 2019 | Active |
| MIA FUNDING LLCBranford, CT · Forfeited | Branford, CT | LLC | Mar 22, 2019 | Forfeited |
| 492 GLENBROOK ROAD LLCStamford, CT · Active | Stamford, CT | LLC | Apr 25, 2019 | Active |
| THE BLOOD OF PARADISE, LLCWindsor, CT · Active | Windsor, CT | LLC | Jul 15, 2019 | Active |
| 104-106 OCEAN LLCNew London, CT · Forfeited | New London, CT | LLC | Dec 10, 2019 | Forfeited |
| 54 STOCK STREET, LLCDarien, CT · Dissolved | Darien, CT | LLC | Dec 16, 2019 | Dissolved |
| COSTCO-INNOVEL SOLUTIONS LLCLocation not reported, CT · Active | Location not reported, CT | LLC | Dec 27, 2019 | Active |
| BGV LLCBranford, CT · Active | Branford, CT | LLC | Sep 16, 2020 | Active |
| Unquowa 14 LLCFairfield, CT · Active | Fairfield, CT | LLC | Jul 1, 2021 | Active |