| 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 |
| 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 |
| 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 |
| TIMES MICROWAVE SYSTEMS, INC.Wallingford, CT · Active | Wallingford, CT | Corporation | Jun 30, 2004 | 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 |
| 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 |
| SV MICROWAVE, INC.Wallingford, CT · Active | Wallingford, CT | Corporation | Dec 8, 2008 | 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 GRIFFITH ENTERPRISES, LLCLocation not reported, CT · Withdrawn | Location not reported, CT | LLC | Aug 10, 2012 | Withdrawn |
| AMPHENOL NELSON-DUNN TECHNOLOGIES, INC.Wallingford, CT · Active | Wallingford, CT | Corporation | Aug 14, 2012 | Active |
| HOLLAND ELECTRONICS, LLCWallingford, CT · Active | Wallingford, CT | LLC | Oct 2, 2012 | Active |
| AMPHENOL DC ELECTRONICS, INC.Wallingford, CT · Active | Wallingford, CT | Corporation | Jul 11, 2013 | Active |
| AMPHENOL TECVOX LLCWallingford, CT · Active | Wallingford, CT | LLC | Nov 27, 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 |
| AMPHENOL INDEMNITY INC.Wallingford, CT · Active | Wallingford, CT | Corporation | Jun 7, 2019 | Active |
| AMPHENOL TREASURY CO., INCWallingford, CT · Active | Wallingford, CT | Corporation | Aug 31, 2023 | Active |
| Outdoor Wireless Networks LLCWallingford, CT · Active | Wallingford, CT | LLC | Jul 15, 2024 | Active |