| STS HOLDINGS, LLCJensen Beach, FL · Active | Jensen Beach, FL | LLC | Mar 27, 2019 | Active |
| AIRLINE TECH REPS, LLCJensen Beach, FL · Active | Jensen Beach, FL | LLC | Oct 11, 2006 | Active |
| TACTICAL WORKFORCE SOLUTIONS, INC.Location not reported, FL · Inactive | Location not reported, FL | Corporation | Nov 4, 2005 | Inactive |
| STS SERVICES, INC.Jensen Beach, FL · Inactive | Jensen Beach, FL | Corporation | Dec 1, 1993 | Inactive |
| STS AVIATION SERVICES - TANK TIGERS INC.Location not reported, FL · Inactive | Location not reported, FL | Corporation | Jul 14, 1997 | Inactive |
| STS HOLDINGS, INC.Jensen Beach, FL · Inactive | Jensen Beach, FL | Corporation | Oct 16, 1998 | Inactive |
| BMP SERVICES, INC.Jensen Beach, FL · Inactive | Jensen Beach, FL | Corporation | Oct 16, 1998 | Inactive |
| STS DESIGN AND MANUFACTURING, LLCJensen Beach, FL · Inactive | Jensen Beach, FL | LLC | Aug 14, 2014 | Inactive |
| SPACE COAST REPAIR AND MODIFICATION, LLCJensen Beach, FL · Inactive | Jensen Beach, FL | LLC | Jun 22, 2017 | Inactive |
| LMO AVIATION L.L.C.Jensen Beach, FL · Inactive | Jensen Beach, FL | LLC | Dec 12, 2007 | Inactive |
| AIRPLANES, LLCJensen Beach, FL · Inactive | Jensen Beach, FL | LLC | Jul 16, 2019 | Inactive |
| STS ENGINEERING SERVICES, LLCJensen Beach, FL · Inactive | Jensen Beach, FL | LLC | Jul 16, 2019 | Inactive |
| STS WORKFORCE SOLUTIONS, LLCJensen Beach, FL · Inactive | Jensen Beach, FL | LLC | Jul 16, 2019 | Inactive |
| STS GSE SERVICES, LLCJensen Beach, FL · Inactive | Jensen Beach, FL | LLC | Jul 23, 2019 | Inactive |
| STS TECHNICAL SOLUTIONS LLCJensen Beach, FL · Inactive | Jensen Beach, FL | LLC | Jul 23, 2019 | Inactive |
| STS ENGINEERING SERVICES, INC.Jensen Beach, FL · Inactive | Jensen Beach, FL | Corporation | Dec 13, 2000 | Inactive |
| NEW STS HOLDINGS, INC.Jensen Beach, FL · Inactive | Jensen Beach, FL | Corporation | Dec 12, 2018 | Inactive |
| NEW STS TECHNICAL SOLUTIONS, INC.Jensen Beach, FL · Inactive | Jensen Beach, FL | Corporation | Dec 12, 2018 | Inactive |
| NEW STS DISTRIBUTION SOLUTIONS, INC.Jensen Beach, FL · Inactive | Jensen Beach, FL | Corporation | Dec 12, 2018 | Inactive |
| NEW STS GSE SERVICES, INC.Jensen Beach, FL · Inactive | Jensen Beach, FL | Corporation | Dec 12, 2018 | Inactive |
| STS WORKFORCE SOLUTIONS, INC.Jensen Beach, FL · Inactive | Jensen Beach, FL | Corporation | Jul 21, 1993 | Inactive |
| AIRPLANES, INC.Jensen Beach, FL · Inactive | Jensen Beach, FL | Corporation | Mar 6, 1991 | Inactive |