| Mediterra Bakery | Coolidge | 85128 | 2003 - ARIZONA@WORK - Pinal | Aug 17, 2023 | Non-WARN | 
| Medline Industries LP | Yuma | 85365 | 9 - ARIZONA@WORK - Yuma County | Oct 21, 2024 | Non-WARN | 
| MetLife |  |  | 7 - ARIZONA@WORK - Maricopa County | May 01, 2012 | WARN | 
| Meyer Burger Americas | Goodyear | 85338 | 7 - ARIZONA@WORK - Maricopa County | May 22, 2025 | WARN | 
| Michael Foods | Yuma | 85365 | 9 - ARIZONA@WORK - Yuma County | Apr 04, 2023 | Non-WARN | 
| Michael Foods | Yuma | 85365 | 9 - ARIZONA@WORK - Yuma County | Jan 15, 2024 | WARN | 
| Michaels Arts and Crafts |  |  |  | Jan 11, 2012 | Non-WARN | 
| Microchip | Tempe | 85281 | 7 - ARIZONA@WORK - Maricopa County | Mar 03, 2025 | WARN | 
| Microchip | Tempe | 85281 | 7 - ARIZONA@WORK - Maricopa County | Oct 29, 2025 | WARN | 
| Microsemi Corporation |  |  | 7 - ARIZONA@WORK - Maricopa County | Jul 12, 2010 | WARN | 
| Microtech Southwest, Inc./ Westfall Technik, Inc. | Las Vegas | 89169 | 7 - ARIZONA@WORK - Maricopa County | Feb 23, 2023 | WARN | 
| Mike Campbell & Associates |  |  | 7 - ARIZONA@WORK - Maricopa County | Jul 06, 2011 | WARN | 
| Milemarkers | Lake Havasu City | 86404 | 11 - ARIZONA@WORK - Mohave and La Paz Counties | Nov 15, 2024 | Non-WARN | 
| Milgard Windows & Doors |  |  | 7 - ARIZONA@WORK - Maricopa County | Oct 17, 2011 | WARN | 
| Mindbody | Scottsdale | 85257 | 7 - ARIZONA@WORK - Maricopa County | Apr 03, 2020 | WARN | 
| Mind Body |  |  | 7 - ARIZONA@WORK - Maricopa County | Apr 07, 2020 | WARN | 
| Mineral Park Inc. |  |  |  | Dec 29, 2014 | WARN | 
| Mojave Desert Minerals, LLC | Oatman | 86433 |  | Jul 12, 2012 | WARN | 
| Monitronics International, Inc. d/b/a Brinks Home | Phoenix | 85004 | 5 - ARIZONA@WORK - City of Phoenix | Dec 17, 2021 | WARN | 
| Monitronics International, Inc., d/b/a Brinks Home | Dallas | 75234 | 6 - ARIZONA@WORK - Pima | Jan 05, 2023 | WARN | 
| Mountain Valley Express, LLC | Phoenix | 85009 | 5 - ARIZONA@WORK - City of Phoenix | Nov 25, 2024 | WARN | 
| Movement for Life Inc. | Multiple | 85711 | 6 - ARIZONA@WORK - Pima | Mar 25, 2020 | WARN | 
| Mural Consulting Corporation | Tucson | 85704 | 6 - ARIZONA@WORK - Pima | Mar 02, 2023 | Non-WARN | 
| Mural Technologies | Tucson | 85747 | 6 - ARIZONA@WORK - Pima | Jun 09, 2025 | WARN | 
| National Education Partners | Scottsdale | 85255 | 7 - ARIZONA@WORK - Maricopa County | Nov 04, 2021 | WARN |