| PRIMORIS FIELD SERVICES, INC.Location not reported, FL · Active | Location not reported, FL | Corporation | Oct 27, 2022 | Active |
| PRIMORIS ELECTRIC, INC.Location not reported, FL · Active | Location not reported, FL | Corporation | Jun 12, 2020 | Active |
| ARB, INC. OF CALIFORNIALocation not reported, FL · Active | Location not reported, FL | Corporation | Aug 18, 2016 | Active |
| EDISON POWER CONSTRUCTORS, INC.Location not reported, FL · Active | Location not reported, FL | Corporation | Oct 4, 2013 | Active |
| VADNAIS TRENCHLESS SERVICES, INC.Location not reported, FL · Active | Location not reported, FL | Corporation | Dec 16, 2015 | Active |
| PRIMORIS DISTRIBUTION SERVICES, INC.Dade City, FL · Active | Dade City, FL | Corporation | Apr 27, 2017 | Active |
| CARDINAL CONTRACTORS, INC.Pompano Beach, FL · Active | Pompano Beach, FL | Corporation | Nov 19, 2003 | Active |
| AUGER SERVICES, INC.Location not reported, FL · Inactive | Location not reported, FL | Corporation | Jan 5, 2001 | Inactive |
| ROCKFORD PIPELINE CORPORATIONLocation not reported, FL · Active | Location not reported, FL | Corporation | Mar 12, 2008 | Active |
| PRIMORIS ENERGY SERVICES CORPORATIONLocation not reported, FL · Active | Location not reported, FL | Corporation | Apr 26, 2012 | Active |
| SNELSON COMPANIES, INC.Location not reported, FL · Active | Location not reported, FL | Corporation | Mar 1, 2013 | Active |
| PRIMORIS POWER LINE SERVICES, INC.Location not reported, FL · Active | Location not reported, FL | Corporation | Oct 23, 2013 | Active |
| PRIMORIS RENEWABLE ENERGY, INC.Location not reported, FL · Active | Location not reported, FL | Corporation | Dec 1, 2016 | Active |
| PRIMORIS DESIGN & CONSTRUCTION, INC.Location not reported, FL · Active | Location not reported, FL | Corporation | Feb 2, 2021 | Active |
| PRIMORIS FLEET SERVICES, INC.Location not reported, FL · Active | Location not reported, FL | Corporation | Jun 30, 2021 | Active |
| PRIMORIS PIPELINE, INC.Location not reported, FL · Active | Location not reported, FL | Corporation | Oct 28, 2022 | Active |
| JAMES CONSTRUCTION GROUP, L.L.C.Location not reported, FL · Inactive | Location not reported, FL | LLC | Jul 31, 1998 | Inactive |
| SOUTHEAST DIRECTIONAL DRILLING, LLCLocation not reported, FL · Active | Location not reported, FL | LLC | Jun 20, 2005 | Active |
| ENERGY SERVICES SOUTH, LLCLocation not reported, FL · Inactive | Location not reported, FL | LLC | Jul 21, 2009 | Inactive |
| JAMES CONSTRUCTION GROUP, LLCLocation not reported, FL · Active | Location not reported, FL | LLC | Mar 30, 2021 | Active |
| COMTRAC SERVICES, LLCLocation not reported, FL · Inactive | Location not reported, FL | LLC | Mar 2, 2023 | Inactive |