| 4 Over Electric Inc | C10 | 2010 | Active |
| A - 1 Certified Electric Inc | C10 + B | 2005 | Active |
| A A Electric & Plumbing Inc | C10 + C36 | 2008 | Active |
| A And H Electric Company Inc | C10 | 1989 | Active |
| A And M Construction Inc | C10 + B | 2018 | Active |
| Abampere Electric | C10 | 2022 | Active |
| Accurate Energy Services Inc | C10 | 1987 | Active |
| Ace Construction & Maintenance Inc | C10 + B, C8 | 2009 | Active |
| Agng Electric Inc | C10 | 2015 | Active |
| Akobra Construction Inc | C10 + A, B, C36 | 2023 | Active |
| Al & Robin Torres Home Services | C10 + C20, C36 | 2014 | Active |
| American Robust Construction | C10 + B | 2026 | Active |
| American Sun | C10 + B | 2025 | Active |
| Ampere Construction | C10 + B | 2025 | Active |
| Ampereway Electric Inc | C10 | 2025 | Active |
| Aquila Electric Inc | C10 | 2021 | Active |
| Arakel Electric Inc | C10 | 2018 | Active |
| Argrams Electric Inc | C10 | 2026 | Active |
| Arin Electric Inc | C10 | 2024 | Active |
| Armik Electric Inc | C10 | 2018 | Active |
| Armtech Electric Inc | C10 | 2025 | Active |
| Arrakeen Construction & Electric Inc | C10 + B | 2019 | Active |
| Asc Solar Services Inc | C10 | 2024 | Active |
| Aurora Electric & Construction Inc | C10 + B, C36 | 1995 | Active |
| Avanti Building Contractors | C10 + A, B, C36 | 2022 | Renew by Nov 30, 2026 |
| Axis Construction Inc | C10 + A, B, C20 +1 | 1988 | Active |
| Bay Lighting & Design Inc | C10 + B | 2004 | Active |
| BB Electrical Solutions Inc | C10 | 2025 | Active |
| Bedros Electric Inc | C10 + B | 1981 | Active |
| Beneficial Builders Group Inc | C10 + B, C20, C36 | 2026 | Active |
| Beneficial Construction Group Inc | C10 + B, C20 | 2021 | Active |
| Beta Investments And Contracts Inc | C10 + B, C20, C36 | 1986 | Active |
| Big Power Solar Inc | C10 | 2023 | Active |
| Bright Electrical Services Inc | C10 | 2019 | Active |
| Brightstone Renewable Energy | C10 | 2022 | Active |
| Cal Power Aid Inc | C10 + B | 2016 | Active |
| Cal Pro Electric Inc | C10 | 2013 | Active |
| California Electrical Services | C10 | 1985 | Active |
| California Smart Builders | C10 + B | 2026 | Active |
| Challenger Electric Inc | C10 | 2019 | Active |
| Charlie Communications Inc | C10 | 2009 | Active |
| City Electric | C10 | 1991 | Active |
| Connecting Electric Inc | C10 + B | 2005 | Active |
| Cornerstone Construction Solutions Inc | C10 + B, C20, C36 | 2014 | Active |
| Courteous Construction Co Inc | C10 + A, B | 1989 | Active |
| Current Electric Inc | C10 | 1988 | Active |
| Dha Construction Inc | C10 + B, C33 | 2016 | Active |
| Digifier Inc | C10 | 2009 | Active |
| Dvin Electric Inc | C10 | 2018 | Active |
| E-Tron Electric Inc | C10 | 2021 | Active |
| Eagle Eye Electric Inc | C10 | 2016 | Active |
| Ecosun Electric Inc | C10 | 2025 | Active |
| Elektricity Inc | C10 | 2019 | Active |
| Energy Solar Inc | C10 | 2020 | Active |
| Everic Enterprises Inc | C10 + C36 | 2016 | Active |
| Final Electrician LLC | C10 | 2026 | Active |
| Fire Protection Systems | C10 + C7, C16 | 2016 | Active |
| Flag Electrical Inc | C10 | 2019 | Active |
| Fourtech Service Inc | C10 + B, C20, C36 | 2021 | Active |
| Frankyan Electric Inc | C10 | 2016 | Active |
| Futurelectric Inc | C10 | 2023 | Active |
| Glendale Fire Pro Inc | C10 + C16 | 2017 | Active |
| Glendale Fire Protection Inc | C10 + C16 | 1990 | Active |
| Glendale Fire Systems Inc | C10 | 1998 | Renew by Dec 31, 2026 |
| Glensol Inc | C10 + B | 2017 | Active |
| Global Electro Integration Inc | C10 | 2007 | Active |
| Golden State Electrics Inc | C10 | 2026 | Active |
| Gopower Energy | C10 | 2023 | Active |
| Green Current Solar Inc | C10 | 2025 | Active |
| Green Road Solar | C10 + B | 2012 | Active |
| H V H Electric Inc | C10 | 2023 | Active |
| Harry's Cooling And Heating H C H Inc | C10 + C4, C20, C38 | 2005 | Active |
| Hart Design Build Inc | C10 + A, B, C20 +2 | 2022 | Active |
| Hi-Tech Electro Design | C10 + C7 | 2004 | Active |
| High Class Services Inc | C10 + B | 2011 | Active |
| High Power Electrical Services | C10 | 2018 | Active |
| Hirsch Electric Inc | C10 | 1981 | Active |
| HNT Electric Inc | C10 | 2019 | Active |
| HP Electrical Group Inc | C10 | 2025 | Active |
| HPC Electric | C10 | 2020 | Renew by Dec 31, 2026 |
| Intech Electrical Inc | C10 | 2008 | Active |
| Integral Electrical Engineering Inc | C10 | 2012 | Active |
| Intelligent Interiors Inc | C10 | 2005 | Active |
| Ivolt Inc | C10 + B | 2011 | Active |
| J W Electric And Data Inc | C10 + B | 2017 | Active |
| Just One Call Inc | C10 + B, C20, C36 | 2015 | Active |
| Kara Construction Group Inc | C10 + B | 2020 | Active |
| Kent D Electric Inc | C10 | 1986 | Active |
| Kizyma Enterprises Inc | C10 + B | 1987 | Active |
| L.A. Electrical Services Inc | C10 | 2023 | Active |
| La Bloom Electric Inc | C10 | 2024 | Active |
| La Electrician | C10 | 2016 | Active |
| Leader Electrical Services Inc | C10 | 2012 | Active |
| Ledora Electric Inc | C10 | 2023 | Active |
| Leggitt Electric LTD | C10 | 1984 | Active |
| Magic Solar Electric | C10 + B, C39 | 2014 | Renew by Dec 31, 2026 |
| Markey Electric Service LLC | C10 | 1992 | Active |
| Masters Contracting Corporation | C10 + A, B, C21 +1 | 1984 | Active |
| Max-Pro Electric Corp | C10 + B | 2006 | Active |
| Melrose Management Group Inc | C10 | 2022 | Active |