| 9500 Engineering Construction | A + C7 | 2017 | Active |
| A&S Construction Inc | A | 2024 | Active |
| Acs Builders | B + C10, C20, C38 | 2021 | Active |
| Action Landscape Services Inc | A, B + C27, D49 | 2009 | Active |
| Affordable Construction Services Inc | B | 2016 | Active |
| Albers Development Corporation | B | 2004 | Active |
| Albers MFG Co Inc | B | 1971 | Active |
| All American Construction Solutions | A, B + C20, C51 | 2018 | Active |
| All Cities Enterprises | B + C13 | 1997 | Active |
| All Weather Roofing | B + C39 | 1978 | Active |
| Allied Builders Inc | B | 2004 | Active |
| Aloha Construction Services | B | 2023 | Active |
| Alvarado General Builders Inc | B | 2018 | Active |
| Amj Inc | A + C34 | 2021 | Active |
| Ams Restoration Inc | B | 2025 | Active |
| Ap Electrical Construction Inc | A + C10 | 2011 | Active |
| Apex Construction Solutions Inc | B | 2016 | Active |
| Apex Walls Builders Inc | B + C9 | 2023 | Active |
| Ascendance Construction & Electrical | B + C10, C27 | 2026 | Active |
| Ashyer Built Construction LLC | B | 2024 | Active |
| Ateck Construction Inc | B + C10, C16, C36 | 2004 | Active |
| B&D Home Renovation LLC | B + C10 | 2026 | Active |
| Baldwin Construction | B | 2016 | Renew by Dec 31, 2026 |
| Bern Construction Group Inc | B + C15, C54 | 2017 | Active |
| Bonilla Equipment Inc | A | 2012 | Active |
| Bonnema J D Custom Cabinets And Millworks Inc | B + C6 | 1997 | Active |
| Bridgerock Construction Inc | B + C10, C36 | 2022 | Active |
| Bullseye Builders Inc | B | 2016 | Active |
| Burdett James Construction Inc | B + C20 | 1991 | Active |
| Burner Construction Corp | B + C10 | 2018 | Active |
| C & C Building And Landscaping Inc | B + C27 | 2008 | Active |
| C G C Construction Services And Development Inc | B | 2015 | Active |
| C M Peich Inc | A | 1995 | Active |
| C T S Mechanical Inc | B + C20, C38 | 2010 | Renew by Dec 31, 2026 |
| C2e Construction Inc | B | 2023 | Active |
| Cal 1 Construction Inc | B | 2025 | Active |
| Cal State Construction Services Inc | B | 1994 | Active |
| California Construction | B + C20 | 1994 | Active |
| Californiacare Restoration Inc | B | 2019 | Active |
| Campbell Construction | B + C2, C9, C33 +1 | 1991 | Active |
| Casa Buena Construction | B + C9, D63 | 2022 | Active |
| Cloud City Construction Inc | B | 2018 | Active |
| CNX Concrete Construction | B | 2026 | Active |
| Coburn Equipment Inc | A | 1977 | Active |
| Commodity Trucking Acquisition LLC | A | 2019 | Active |
| Complete Construction Partnerships Inc | B + C33 | 1987 | Active |
| Complete Door Systems | B + D28 | 1995 | Active |
| Cornell Custom Construction | B | 1993 | Active |
| Cornerstone Construction & Remodel Inc | B | 2026 | Active |
| Creative Interior Center Inc | B | 2020 | Active |
| Crosspoint Real Estate Inc | B | 2016 | Active |
| Crosstown Electrical & Data Inc | A + C10 | 1998 | Active |
| D & R Plumbing Inc | B + C36 | 1955 | Active |
| Da Valle Construction Inc | B + C8 | 2017 | Active |
| DCFM Management LLC | B | 2026 | Active |
| Delta Construction And Renovation LLC | B | 2021 | Active |
| Diamond Bar Electric Inc | A + C10 | 2000 | Active |
| DLC Construction | B | 2023 | Active |
| DLC Construction | B | 2010 | Active |
| Duke Pacific Inc | B | 1958 | Active |
| E & I Development Construction Incorporated | B | 2017 | Active |
| E & J General Construction Inc | B + C33 | 2001 | Renew by Nov 30, 2026 |
| Elecnor Belco Electric Inc | A, B + C10 | 1997 | Active |
| Elecnor Hawkeye LLC | A, B + C10 | 2019 | Active |
| Elecnor Inc | A, B + C10 | 2011 | Active |
| Elephant Construction Inc | B | 2026 | Active |
| Enco Engineering Inc | A | 2024 | Active |
| Everything Efficient | B | 2010 | Active |
| Exterior Construction Inc | A + C8, C27 | 2013 | Active |
| Farrell Dick Industries Inc | A | 1990 | Active |
| FDSP Brightline JV | A | 2026 | Active |
| Ferris Contracting | B + C9, C27 | 2021 | Active |
| Fire Tech | B + C16 | 2014 | Active |
| Flatiron Dragados USA Inc | A | 2009 | Active |
| Flex General Construction Corp | B + C54 | 2024 | Active |
| Foothills Heating & Cooling | B + C20, C38 | 1981 | Active |
| Foresight Construction Services LLC | B | 2024 | Renew by Dec 31, 2026 |
| FR Builders | B | 2020 | Active |
| Fuel Pros Inc | A, B + C36, HAZ | 1971 | Active |
| G & M Backhoe Service Inc | A | 2002 | Active |
| G D L Construction Group Inc | B + C53 | 2008 | Active |
| G Land Construction | B | 2017 | Active |
| Gavinet Construction Inc | B | 2007 | Active |
| Genesis Construction And Remodeling Inc | B | 2007 | Active |
| Genesis Construction LLC | B | 2024 | Active |
| Genesis Wrecking Inc | B + C21, HAZ | 2024 | Active |
| Golden K Construction LLC | B | 2025 | Active |
| Golden State Boring & Pipe Jacking Inc | A | 1993 | Active |
| Gordon Painting Co Inc | B + C33 | 1984 | Active |
| Greenland Landscape & Maintenance Inc | B + C8, C27 | 1998 | Active |
| Growth Development Marketing Incorporated | A | 2012 | Active |
| GSCC Builders Inc | B | 2023 | Active |
| Hailey Jimsyn Construction Inc | B | 2008 | Active |
| Hi - Way Safety Rentals Inc | A + C31, C32 | 2009 | Active |
| Horton R J Construction Supply Inc | B | 2000 | Active |
| Huang Remodel & Construction | B | 2022 | Active |
| Hugo's Plumbing & Vilchez Construction Inc | B + C36 | 1998 | Active |
| Hussmann Services Corporation | B + C20, C38 | 2011 | Active |
| HW Power | A, B + C10, D31 | 2018 | Active |
| J Barber Corporation | B | 2023 | Active |