| MAX SILVERMAN AND SONS, INCORPORATEDLocation not reported, CT · Dissolved | Location not reported, CT | Corporation | May 14, 1954 | Dissolved |
| TIMES FIBER COMMUNICATIONS, INC.Wallingford, CT · Active | Wallingford, CT | Corporation | Mar 17, 1977 | Active |
| RUSHFORD CENTER, INC.Meriden, CT · Active | Meriden, CT | Corporation | Apr 29, 1975 | Active |
| WAREHOUSE STORE FIXTURE COMPANY, INC. THEWaterbury, CT · Active | Waterbury, CT | Corporation | Feb 16, 1983 | Active |
| CASCO PRODUCTS CORPORATIONWallingford, CT · Active | Wallingford, CT | Corporation | Apr 1, 1985 | Active |
| AMPHENOL CORPORATIONWallingford, CT · Active | Wallingford, CT | Corporation | May 18, 1987 | Active |
| AMPHENOL INTERCONNECT PRODUCTS CORPORATIONWallingford, CT · Active | Wallingford, CT | Corporation | Jun 21, 1988 | Active |
| REMEDY, INC.New Haven, CT · Forfeited | New Haven, CT | Corporation | Jun 29, 1992 | Forfeited |
| SINE SYSTEMS CORPORATIONWallingford, CT · Active | Wallingford, CT | Corporation | Sep 26, 1997 | Active |
| AMPHENOL USHOLDCO INC.Wallingford, CT · Active | Wallingford, CT | Corporation | Jun 8, 1998 | Active |
| AMPHENOL PRINTED CIRCUITS, INC.Wallingford, CT · Active | Wallingford, CT | Corporation | Feb 26, 1999 | Active |
| MUZAK LLCLocation not reported, CT · Active | Location not reported, CT | LLC | May 4, 1999 | Active |
| AMPHENOL T&M ANTENNAS, INC.Wallingford, CT · Active | Wallingford, CT | Corporation | Mar 22, 2000 | Active |
| GREENBLADE XVIII, LLCCheshire, CT · Active | Cheshire, CT | LLC | Jun 19, 2002 | Active |
| AMPHENOL PCD, INC.Wallingford, CT · Active | Wallingford, CT | Corporation | May 1, 2003 | Active |
| AMPHENOL ANTENNA SOLUTIONS, INC.Wallingford, CT · Active | Wallingford, CT | Corporation | Nov 21, 2003 | Active |
| AMPHENOL INTERNATIONAL LTD.Wallingford, CT · Active | Wallingford, CT | Corporation | Nov 24, 2004 | Active |
| AMPHENOL OPTIMIZE MANUFACTURING CO.Wallingford, CT · Active | Wallingford, CT | Corporation | Nov 24, 2004 | Active |
| TIMES WIRE AND CABLE COMPANYWallingford, CT · Active | Wallingford, CT | Corporation | Nov 24, 2004 | Active |
| RFS Technologies, Inc.Wallingford, CT · Active | Wallingford, CT | Corporation | Jan 10, 2005 | Active |
| AMPHENOL INTERCON SYSTEMS, INC.Wallingford, CT · Active | Wallingford, CT | Corporation | Mar 29, 2005 | Active |
| FIBER SYSTEMS INTERNATIONAL, INC.Wallingford, CT · Active | Wallingford, CT | Corporation | Apr 18, 2005 | Active |
| AMPHENOL SV MICROWAVE ACQUISITION CORP.Location not reported, CT · Withdrawn | Location not reported, CT | Corporation | Sep 28, 2005 | Withdrawn |
| AMPHENOL ALDEN PRODUCTS COMPANYWallingford, CT · Active | Wallingford, CT | Corporation | Mar 14, 2006 | Active |
| TIGER REALTY, LLCCheshire, CT · Active | Cheshire, CT | LLC | Nov 20, 2006 | Active |
| AMPHENOL CABLES ON DEMAND CORP.Wallingford, CT · Active | Wallingford, CT | Corporation | Dec 1, 2006 | Active |
| C & S ANTENNAS INC.Wallingford, CT · Active | Wallingford, CT | Corporation | Mar 23, 2009 | Active |
| AMPHENOL ADRONICS, INC.Wallingford, CT · Active | Wallingford, CT | Corporation | Sep 29, 2010 | Active |
| AMPHENOL BORISCH TECHNOLOGIES, INC.Wallingford, CT · Active | Wallingford, CT | Corporation | Jan 5, 2011 | Active |
| KONNEKTECH, LTD.Wallingford, CT · Active | Wallingford, CT | Corporation | Jan 27, 2011 | Active |
| CEMM THOME CORP.Wallingford, CT · Active | Wallingford, CT | Corporation | May 26, 2011 | Active |
| AMPHENOL NELSON-DUNN TECHNOLOGIES, INC.Wallingford, CT · Active | Wallingford, CT | Corporation | Aug 14, 2012 | Active |
| AMPHENOL DC ELECTRONICS, INC.Wallingford, CT · Active | Wallingford, CT | Corporation | Jul 11, 2013 | Active |
| CRANBROOK HOMEOWNERS ASSOCIATION INC.West Hartford, CT · Active | West Hartford, CT | Corporation | Jun 20, 2014 | Active |
| AMPHENOL THERMOMETRICS, INC.Wallingford, CT · Active | Wallingford, CT | Corporation | Nov 21, 2014 | Active |
| AMPHENOL EEC, INC.Wallingford, CT · Active | Wallingford, CT | Corporation | Feb 13, 2015 | Active |
| AUTOFI, INC.Location not reported, CT · Active | Location not reported, CT | Corporation | Nov 23, 2015 | Active |
| ONE OAK AUTO LLCDanbury, CT · Dissolved | Danbury, CT | LLC | Jul 31, 2018 | Dissolved |
| MOOD MEDIA NORTH AMERICA, LLCLocation not reported, CT · Active | Location not reported, CT | LLC | Aug 13, 2018 | Active |
| TPC WIRE & CABLE CORP.Wallingford, CT · Active | Wallingford, CT | Corporation | Jun 6, 2019 | Active |
| LEMON TREE PROPERTIES, LLCSouthbury, CT · Active | Southbury, CT | LLC | Oct 17, 2019 | Active |
| ORANGE TREE REALTY LLCOrange, CT · Active | Orange, CT | LLC | Dec 12, 2019 | Active |
| WEAVE COMMUNICATIONS, INC.Location not reported, CT · Active | Location not reported, CT | Corporation | Mar 6, 2020 | Active |
| AMDA INC.Location not reported, CT · Active | Location not reported, CT | Corporation | May 10, 2022 | Active |
| PSSP, LLCAvon, CT · Dissolved | Avon, CT | LLC | Apr 26, 2023 | Dissolved |
| Penny's Pup's Limited Liability CompanyGaylordsville, CT · Forfeited | Gaylordsville, CT | LLC | May 20, 2023 | Forfeited |
| JGS L.L.C.New Fairfield, CT · Active | New Fairfield, CT | LLC | Jul 24, 2023 | Active |
| Twelve Grapes New Fairfield LLCNew Fairfield, CT · Active | New Fairfield, CT | LLC | Feb 26, 2024 | Active |
| BUSBOT INCORPORATEDLocation not reported, CT · Active | Location not reported, CT | Corporation | Jul 15, 2025 | Active |
| Apple Tree Realty LLCOrange, CT · Active | Orange, CT | LLC | Nov 5, 2025 | Active |