| TUBE HOLDING COMPANY, INC.Location not reported, CT · Active | Location not reported, CT | Corporation | Apr 17, 1945 | Active |
| GOODRICH CORPORATIONLocation not reported, CT · Active | Location not reported, CT | Corporation | Aug 6, 1934 | Active |
| SAFEWAY PRODUCTS INC.Location not reported, CT · Active | Location not reported, CT | Corporation | Jul 7, 1969 | Active |
| RAYTHEON TECHNOLOGIES REALTY, INC.Farmington, CT · Active | Farmington, CT | Corporation | Sep 24, 1980 | Active |
| UT FINANCE CORPORATIONEast Hartford, CT · Active | East Hartford, CT | Corporation | Mar 18, 1985 | Active |
| RAYTHEON COMPANYLocation not reported, CT · Active | Location not reported, CT | Corporation | Jan 19, 1988 | Active |
| UTC CORPORATIONFarmington, CT · Active | Farmington, CT | Corporation | Mar 8, 1989 | Active |
| UNITED TECHNOLOGIES WORLDWIDE HOLDINGS, INC.East Hartford, CT · Active | East Hartford, CT | Corporation | Jan 17, 1992 | Active |
| UT PARK VIEW, INC.Farmington, CT · Active | Farmington, CT | Corporation | Dec 21, 1994 | Active |
| PRATT & WHITNEY COMPRESSOR AIRFOIL HOLDINGS, INC.East Hartford, CT · Active | East Hartford, CT | Corporation | Sep 12, 1995 | Active |
| PRATT & WHITNEY EXPORT, INC.East Hartford, CT · Active | East Hartford, CT | Corporation | Oct 24, 1995 | Active |
| PRATT & WHITNEY SERVICES, INC.East Hartford, CT · Active | East Hartford, CT | Corporation | Jun 20, 1997 | Active |
| PAST TECHNOLOGIES CORPORATIONFarmington, CT · Active | Farmington, CT | Corporation | Sep 10, 1997 | Active |
| UNITED TECHNOLOGIES TREASURY CENTER, INC.Farmington, CT · Active | Farmington, CT | Corporation | Dec 29, 1997 | Active |
| HAMILTON SUNDSTRAND CORPORATIONLocation not reported, CT · Active | Location not reported, CT | Corporation | Jul 20, 1999 | Active |
| PRATT & WHITNEY AUTOMATION, INC.Location not reported, CT · Active | Location not reported, CT | Corporation | Dec 15, 1999 | Active |
| ATLANTIC INERTIAL SYSTEMS INC.Cheshire, CT · Active | Cheshire, CT | Corporation | Jan 5, 2000 | Active |
| PRATT & WHITNEY CENCO, INC.East Hartford, CT · Active | East Hartford, CT | Corporation | Mar 20, 2001 | Active |
| UNITED TECHNOLOGIES DOMESTIC OPERATIONS, INC.Farmington, CT · Active | Farmington, CT | Corporation | May 4, 2001 | Active |
| UNITED TECHNOLOGIES INTERNATIONAL OPERATIONS, INC.East Hartford, CT · Active | East Hartford, CT | Corporation | Oct 29, 2001 | Active |
| UNITED TECHNOLOGIES INTERNATIONAL CORPORATIONEast Hartford, CT · Active | East Hartford, CT | Corporation | Dec 18, 2001 | Active |
| BUGBEE SCHOOL PTO, INC.West Hartford, CT · Active | West Hartford, CT | Corporation | Feb 6, 2002 | Active |
| PRATT & WHITNEY MILITARY AFTERMARKET SERVICES, INC.East Hartford, CT · Active | East Hartford, CT | Corporation | Oct 30, 2003 | Active |
| GOODRICH PUMP & ENGINE CONTROL SYSTEMS, INC.Location not reported, CT · Active | Location not reported, CT | Corporation | Apr 22, 2004 | Active |
| PRATT & WHITNEY LINE MAINTENANCE SERVICES, INC.East Hartford, CT · Active | East Hartford, CT | Corporation | May 25, 2005 | Active |
| ROCKWELL COLLINS, INC.Location not reported, CT · Active | Location not reported, CT | Corporation | Jun 6, 2005 | Active |
| RTX BBN TECHNOLOGIES, INC.Location not reported, CT · Active | Location not reported, CT | Corporation | Apr 3, 2006 | Active |
| UNITED TECHNOLOGIES RESEARCH CENTER, INC.East Hartford, CT · Withdrawn | East Hartford, CT | Corporation | Mar 12, 2009 | Withdrawn |
| UNITED TECHNOLOGIES INTERNATIONAL SUPPORT, INC.East Hartford, CT · Active | East Hartford, CT | Corporation | Apr 7, 2009 | Active |
| UNITED TECHNOLOGIES GLOBAL CORPORATIONFarmington, CT · Active | Farmington, CT | Corporation | Apr 30, 2015 | Active |
| PRATT & WHITNEY GLOBAL SUPPORT, INC.East Hartford, CT · Active | East Hartford, CT | Corporation | Oct 16, 2017 | Active |
| ARINC INCORPORATEDLocation not reported, CT · Active | Location not reported, CT | Corporation | Nov 25, 2019 | Active |
| PRATT & WHITNEY PUERTO RICO, INCLocation not reported, CT · Active | Location not reported, CT | Corporation | Mar 27, 2024 | Active |