| Matrex Construction LLC | Edward Richard Jr Rodriguez | — | (760) 792 7535 | GC, remodel, ADU | Wildomar · Riverside County | — | — |
| Matrix America | Matrix America | — | (714) 357 9912 | GC, remodel, ADU | Corona · Riverside County | — | — |
| Matrix Concrete Artisans INC | Ryan Dean Lee | — | (866) 564 0121 | Other | Murrieta · Riverside County | — | — |
| Matrix Construction Services | Todd Christopher Coomes | — | (951) 493 0100 | Electricians | Murrieta · Riverside County | — | — |
| Matrix HVAC INC | Todd Christopher Coomes | — | (951) 257 0600 | HVAC | Corona · Riverside County | — | — |
| Matrix Technologies Electrical Contractors INC | Keith Andrew Winkler | — | (951) 279 9052 | Electricians | Corona · Riverside County | — | — |
| Matsumoto Electric INC | Phillip P Gueco | — | (562) 244 3894 | Electricians | Temecula · Riverside County | — | — |
| Matt Carsey Construction | Matthew Craig Carsey | — | (949) 525 5422 | GC, remodel, ADU | Lake Elsinore · Riverside County | — | — |
| Matt Fitzpatrick Electric | Matthew Ryan Fitzpatrick | — | (760) 219 0619 | Electricians | Indio · Riverside County | — | — |
| Matt Smith Painting | Matt Smith Painting | — | (909) 382 1258 | Windows, patio, painters | Beaumont · Riverside County | — | — |
| Matt Snyder Plumbing Co | Matthew Joseph Snyder | — | (760) 880 4912 | Other | Palm Springs · Riverside County | — | — |
| Matthew Jeffrey Syrett Electric | Matthew Jeffrey Syrett | — | (951) 334 5458 | Electricians | Banning · Riverside County | — | — |
| Matthew Knipps | Matthew Knipps | — | (619) 581 3360 | GC, remodel, ADU | Temecula · Riverside County | — | — |
| Matthew O'malley | Matthew O'malley | — | (760) 275 3820 | Electricians | Sky Valley · Riverside County | — | — |
| Matthew Paul Moreno | Matthew Paul Moreno | — | (951) 830 5732 | Other roofers | Moreno Valley · Riverside County | — | — |
| Matthew Pistilli Landscape Services | Matthew Francis Pistilli | — | (951) 769 8969 | Windows, patio, painters | Beaumont · Riverside County | — | — |
| Matthew Richard Davis | Matthew Richard Davis | — | (909) 208 3837 | Electricians | Hemet · Riverside County | — | — |
| Matthew Taylor De Souza | Matthew Taylor De Souza | — | (714) 366 8952 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| Matthew Watson Pools And Spas | Matthew Watson Pools And Spas | — | (951) 330 9295 | Pool | Temecula · Riverside County | — | — |
| Matthew Wayne Norred | Matthew Wayne Norred | — | (714) 493 8247 | Other | Palm Desert · Riverside County | — | — |
| Maui Pool Service | Francisco Nunez Gonzalez | — | (760) 400 9967 | Pool | La Quinta · Riverside County | — | — |
| Maurice Philip Pegorelli | Maurice Philip Pegorelli | — | (714) 404 5514 | GC, remodel, ADU | La Quinta · Riverside County | — | — |
| Mauricios Plumbing | Mauricios Plumbing | — | (951) 790 6161 | Other | Mira Loma · Riverside County | — | — |
| Mav Construction INC | Mark Anthony Vallejo | info@mav-construction.com | (909) 231 0341 | Other roofers | Riverside · Riverside County | — | — |
| Maven Roofing Company LLC | Flemate Brandon | — | (562) 355 3872 | Other roofers | Temecula · Riverside County | — | — |
| Maverick Fence | Maverick Fence | — | (951) 250 7396 | Other | Riverside · Riverside County | — | — |
| Maverick General Engineering | Maverick General Engineering | — | (951) 553 9169 | Other | Temecula · Riverside County | — | — |
| Maverick Plumbing And Rooter | Alfonso Gonzales | — | (951) 334 3316 | Other | Perris · Riverside County | — | — |
| Maverick Rock Breaking | Vicki Lynn Moralez | sebastian@aldusleaf.org | (951) 245 1686 | Windows, patio, painters | Wildomar · Riverside County | — | — |
| Maverick Woodwork LLC | Michael Fernando Montoya | — | (951) 505 0760 | Other | Temecula · Riverside County | — | — |
| Mavic Construction | Adam Loran Romero | — | (951) 434 5394 | GC, remodel, ADU | Menifee · Riverside County | — | — |
| Max Dial Construction | Max Eric Dial | — | (805) 909 2613 | GC, remodel, ADU | Indian Wells · Riverside County | — | — |
| Max Floor Restoration And Waterproofing INC | Apreza Inocente | — | (951) 941 4868 | Restoration | Riverside · Riverside County | — | — |
| Maxim Security System INC | Yale Konrad Smith | — | (951) 310 5366 | Electricians | Corona · Riverside County | — | — |
| Maxima Performance Grading LLC | Annette Louise Bramlett | — | (951) 809 3551 | Other | Hemet · Riverside County | — | — |
| Maximum Finish Construction LLC | Mark Adam Pachacki | maximumfinish250@gmail.com | (760) 404 6139 | GC, remodel, ADU | Palm Desert · Riverside County | — | — |
| Maxten Electric LLC | Mahyar Shahmardani | maxtenelectric@gmail.com | (858) 735 3230 | Electricians | Temecula · Riverside County | — | — |
| Maxx Systems | Timothy John Kosman | — | (951) 454 5265 | Electricians | Murrieta · Riverside County | — | — |
| May Development | Gregory Kealohaokala May | — | (951) 551 8963 | GC, remodel, ADU | Temecula · Riverside County | — | — |
| May Electric INC | Erik Robert May | — | (951) 533 4099 | Electricians | Lake Elsinore · Riverside County | — | — |