| TIMES FIBER COMMUNICATIONS, INC.Wallingford, CT · Active | Wallingford, CT | Corporation | Mar 17, 1977 | 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 |
| ODYSSEY RESOURCE MANAGEMENT III, INC.Location not reported, CT · Withdrawn | Location not reported, CT | Corporation | May 2, 1995 | Withdrawn |
| 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 |
| AMPHENOL T&M ANTENNAS, INC.Wallingford, CT · Active | Wallingford, CT | Corporation | Mar 22, 2000 | Active |
| ASPELLE, INC.Location not reported, CT · Revoked | Location not reported, CT | Corporation | Jan 16, 2003 | Revoked |
| 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 ALDEN PRODUCTS COMPANYWallingford, CT · Active | Wallingford, CT | Corporation | Mar 14, 2006 | Active |
| AMPHENOL CABLES ON DEMAND CORP.Wallingford, CT · Active | Wallingford, CT | Corporation | Dec 1, 2006 | Active |
| CHRISTIAN CONGREGATION OF JEHOVAH'S WITNESSES, INC.Location not reported, CT · Active | Location not reported, CT | Corporation | Jun 19, 2008 | Active |
| TURNER LAWN SERVICE LLCPutnam, CT · Dissolved | Putnam, CT | LLC | Mar 18, 2009 | Dissolved |
| 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 |
| 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 |
| ALL SYSTEMS BROADBAND, INC.Wallingford, CT · Withdrawn | Wallingford, CT | Corporation | Oct 17, 2016 | Withdrawn |
| TPC WIRE & CABLE CORP.Wallingford, CT · Active | Wallingford, CT | Corporation | Jun 6, 2019 | Active |
| Tree Trails Adventures 3, LLCMystic, CT · Active | Mystic, CT | LLC | Jan 20, 2022 | Active |
| QT Renewables, Inc.Location not reported, CT · Active | Location not reported, CT | Corporation | Apr 22, 2022 | Active |
| AMPHENOL TREASURY CO., INCWallingford, CT · Active | Wallingford, CT | Corporation | Aug 31, 2023 | Active |
| GARAGECO INTERMEDIATE, LLCNew Canaan, CT · Active | New Canaan, CT | LLC | Nov 3, 2023 | Active |