| KS Industries LP | C10 + A | 2025 | Active |
| Lacmore Electric LLC | C10 | 2022 | Active |
| Laurel Ag & Water LLC | C10 + A, D21 | 2019 | Active |
| Left Electric LLC | C10 + B | 2024 | Active |
| Light Bridge Networks Inc | C10 | 2008 | Active |
| Lighting Amp Electric Inc | C10 | 2024 | Renew by Nov 30, 2026 |
| Lions Electric | C10 | 2023 | Active |
| Look Up Electric | C10 | 2023 | Active |
| Loop Electric Inc | C10 + A, C31 | 1986 | Active |
| Luna Electric Inc | C10 | 2015 | Active |
| M & S Security Services Incorporated | C10 | 2002 | Active |
| M G W Electric Inc | C10 | 1997 | Active |
| M M S Electric Inc | C10 | 2017 | Active |
| Marathon Welding LLC | C10 + C60 | 2021 | Active |
| Marksman Electric LLC | C10 | 2025 | Active |
| Martinez Electric Inc | C10 + B | 2003 | Active |
| Maverick Integrated Systems LLC | C10 | 2026 | Active |
| MC Murtrey Lince Inc | C10 + B, C42 | 2009 | Active |
| MC Sweeney Enterprises Inc | C10 + B | 2011 | Active |
| McAfee Energy And Construction Inc | C10 + A, B | 2022 | Active |
| McGill Electric Company | C10 | 2002 | Active |
| Mendoza's H V A C & Electrical Inc | C10 + C20 | 2015 | Active |
| Moc Incorporated | C10 + A, B, D49 | 1990 | Active |
| Modern Valley Construction Inc | C10 + A, ASB, B +2 | 2020 | Active |
| Monarch Home Services | C10 + A, B, C20 +2 | 2008 | Active |
| Msi | C10 + C7 | 2014 | Active |
| Msi Security | C10 | 2025 | Active |
| Next Phase Electric Inc | C10 | 2017 | Active |
| Nix Grid Inc | C10 + A, B | 2018 | Renew by Dec 31, 2026 |
| Norcal Electric | C10 + B | 2000 | Active |
| Northern Digital Inc | C10 + C4 | 2002 | Active |
| Olatunji Electric & Solar LLC | C10 | 2024 | Active |
| Old Ranch Construction Inc | C10 + B, C8, C12 +2 | 2016 | Active |
| Owens/Maurer Construction Inc | C10 + A | 2016 | Active |
| Pacific West Sound Professional Audio & Design Inc | C10 | 2001 | Active |
| Patterson Electrical Contracting Inc | C10 + A, B, C7 | 2019 | Active |
| Paulk Electric Inc | C10 | 2017 | Active |
| Pavletich Electric And Communications Inc | C10 + A, B, C7 | 1996 | Active |
| Petersen Electrical Services | C10 | 2023 | Active |
| Pieneir Electric Inc | C10 | 2022 | Active |
| Pinnacle Power LLC | C10 | 2026 | Active |
| Platinum Electric Solutions Inc | C10 | 2023 | Active |
| PLC Mechanical Systems | C10 + C20 | 2020 | Active |
| PLCS Plus International Inc | C10 | 2003 | Active |
| Power Source Energy | C10 | 2024 | Active |
| Preferred Power Solutions Inc | C10 + A | 2011 | Active |
| Premier Lighting | C10 | 1992 | Active |
| Prestige Lighting & Electrical Inc | C10 | 2018 | Active |
| Prestige World Wide Electrical | C10 | 2026 | Active |
| Prime Electric LLC | C10 | 2024 | Active |
| Pritchard Electric | C10 | 2024 | Renew by Dec 31, 2026 |
| Pro Power Solutions LLC | C10 | 2022 | Active |
| Pro3 Automation Inc | C10 | 2018 | Active |
| Process Instruments Inc | C10 + B | 2009 | Active |
| Pulse Electric Inc | C10 | 2018 | Active |
| Quantum Industries | C10 + A, B | 2016 | Renew by Dec 31, 2026 |
| R L H Fire Protection Inc | C10 + A, C16 | 2000 | Active |
| Ramsgate Group Inc | C10 + A, B | 2004 | Active |
| Rankin Electric Inc | C10 | 1981 | Active |
| Reliance Electrical Solutions LLC | C10 | 2024 | Active |
| Reyes Power Solutions LLC | C10 | 2024 | Active |
| Roberts Electric Inc | C10 | 2023 | Active |
| Sabaloni Construction | C10 + B | 1987 | Active |
| Salcido Kenny Electric Inc | C10 | 2003 | Active |
| Sanchez Electric Services LLC | C10 | 2024 | Renew by Nov 30, 2026 |
| Santamaria Electric Corporation | C10 | 2018 | Active |
| Scales Electrical Solutions | C10 | 2018 | Active |
| Schmidt Electric LLC | C10 | 2023 | Active |
| Secure Systems | C10 + C7 | 1991 | Active |
| Serban Sound & Communications | C10 + C7 | 1980 | Active |
| Skycon Electric | C10 | 2004 | Active |
| Solara Energy LLC | C10 | 2024 | Active |
| Son Light Inc | C10 + B, C46 | 2007 | Active |
| South Valley Pump & Drilling | C10 + A, C57, D09 +1 | 1981 | Active |
| South Valley Tech Services | C10 + A, C57, D09 +1 | 2018 | Active |
| Staples Energy | C10 + B, C20, C36 | 2007 | Active |
| Star Electric | C10 | 1985 | Active |
| Stockdale Aire Inc | C10 + C20, C36 | 1983 | Active |
| Stranberg R & L Electrical Inc | C10 | 2005 | Active |
| Sun Peak Solar Services | C10 | 2023 | Active |
| Sun Solar Energy Solutions | C10 + C46 | 2020 | Active |
| Sunset Construction | C10 + B, C20 | 1997 | Active |
| Sunset Mechanical & Construction Inc | C10 + B, C20, C36 +2 | 1990 | Active |
| T & L Battery LLC | C10 | 2025 | Active |
| Taylor Electric And Control Services Inc | C10 + A | 2021 | Active |
| TDC Electric | C10 | 2019 | Active |
| Tec Contractor Inc | C10 + C7 | 2025 | Active |
| Tech - Time Communications Inc | C10 + C7, C27 | 1998 | Active |
| Tel-Tec Security Systems Inc | C10 + C7 | 1985 | Active |
| Terrasun Construction | C10 + B | 2025 | Active |
| Total Clean Energy Inc | C10 | 2026 | Active |
| Tri State Electric Inc | C10 | 1996 | Active |
| Twin Electric | C10 | 1995 | Active |
| Twin Electric Inc | C10 | 2016 | Active |
| Unified Field Services Corporation | C10 + A, B, C33 | 2015 | Active |
| Valencia Aircold Inc | C10 + B, C20 | 2007 | Active |
| Victory Electrical Solutions Inc | C10 | 2020 | Active |
| Vmax Electric Corporation | C10 + B | 2001 | Active |
| Water Services | C10 + A, B, C36 | 2022 | Active |
| Waveform Electric Solutions | C10 + C5 | 2006 | Active |