| Masar Properties Ltd | Real estate | 2025 |
| Mash Chauffeur Ltd | Transport & logistics | 2025 |
| Mashriq Traders Ltd | Wholesale & retail | 2025 |
| Mask Consulting Limited | Information & communication | 2022 |
| Mask Group Limited | Financial services | 2024 |
| Mask International Limited | Wholesale & retail | 2025 |
| Mask Properties Ltd | Construction | 2021 |
| Mason & Bentley Bricklaying Contractors Ltd | Construction | 2020 |
| Mason's of Willenhall Limited | Real estate | 1975 |
| Mass Marketing Media Ltd | Professional & scientific | 2020 |
| Massalla Club (Wolverhampton) Limited | Hospitality | 2018 |
| Massop & Co Ltd | Real estate | 2022 |
| Massttmasalaa Ltd | Hospitality | 2023 |
| Master Key Systems MKS Ltd | Manufacturing | 2008 |
| Masterguard Roofing & Building Ltd | Construction | 2025 |
| Mastermo Ltd | Health & social care | 2012 |
| Masterplan School Finance Ltd | Professional & scientific | 2025 |
| Mastoneie Ltd | Transport & logistics | 2021 |
| MAT Mech Ltd | Wholesale & retail | 2024 |
| MAT88 Ltd | Transport & logistics | 2021 |
| Mata Chintpurni Mandir Ltd | Other services | 2024 |
| Match IT Sports Ltd | Information & communication | 2023 |
| Matchgen Ltd | Professional & scientific | 2025 |
| Materials Enhancement Ltd | Administrative & support | 1995 |
| Mathai Transport Limited | Transport & logistics | 2018 |
| Matharu Investments & Holdings Limited | Real estate | 2024 |
| Mathew Gastrointestinal Consultancy Services Limited | Health & social care | 2012 |
| Mathon Lodge (Wolverhampton) Management Company Limited | Households | 2007 |
| Mathone Transport Limited | Transport & logistics | 2024 |
| Matiasb Ltd | Transport & logistics | 2022 |
| Matini Limited | Construction | 2019 |
| Matini Projects Limited | Construction | 2024 |
| Matmedics Limited | Health & social care | 2016 |
| Matre Limited | Health & social care | 2016 |
| Matric Services and Supplies Limited | Wholesale & retail | 1999 |
| Matrius Limited | Information & communication | 2002 |
| Matt Wall Ecology Ltd | Professional & scientific | 2023 |
| Mattadoor Access Limited | Construction | 2017 |
| Mattu Builders Ltd | Construction | 2024 |
| Maud Analysis Limited | Administrative & support | 2017 |
| Mava Properties & Investments Ltd | Real estate | 2025 |
| Mavico Limited | Construction | 2023 |
| MAX Discount Ecom Ltd | Wholesale & retail | 2026 |
| MAX Internet Marketing Limited | Information & communication | 2026 |
| MAX STR Ltd | Wholesale & retail | 2026 |
| Maxco Capital Co Ltd | Real estate | 2022 |
| Maxi Express Ltd | Transport & logistics | 2024 |
| Maxi Lift Haulage Ltd | Transport & logistics | 2026 |
| Maxine Morgan Limited | Other services | 2004 |
| Maxline Logistics Limited | Transport & logistics | 2025 |
| Maxmark Ltd | Wholesale & retail | 2024 |
| Maxora Market Ltd | Wholesale & retail | 2026 |
| Maxpro Logistics Ltd | Other services | 2017 |
| Maxx Logistics Ltd | Transport & logistics | 2021 |
| Maya's Grill Limited | Hospitality | 2021 |
| Maya's Meat Centre Limited | Wholesale & retail | 2021 |
| Maya's Superstore Ltd | Wholesale & retail | 2021 |
| Mayce Group Ltd | Administrative & support | 2026 |
| Maycroft Management RTM Company Limited | Real estate | 1989 |
| Mayfair Floors Limited | Wholesale & retail | 2025 |
| Mayfair Homecare Limited | Health & social care | 1998 |
| Mayfare Investments Limited | Real estate | 2024 |
| Mayfem Ltd | Public administration | 2025 |
| Mayfield Services Limited | Administrative & support | 2006 |
| Mayfields Development Ltd | Construction | 2006 |
| Mayflower Home Decor Limited | Wholesale & retail | 2025 |
| Mayfly Quality Ltd | Administrative & support | 2019 |
| Mayors Fest Ltd | Arts & recreation | 2024 |
| Maysa Furniture 21 Ltd | Manufacturing | 2026 |
| Maysa Furniture Ltd | Other services | 2026 |
| Maythorn Developments (FIR Tree) Limited | Construction | 2018 |
| Maythorn Developments Limited | Real estate | 2010 |
| Mazcare Limited | Wholesale & retail | 2002 |
| Maze Access Ltd | Construction | 2025 |
| Mazgas Limited | Construction | 1996 |
| Mazulu Ltd | Households | 2019 |
| MB of Wolverhampton Limited | Wholesale & retail | 2019 |
| MB Site Investigation Ltd | Construction | 2025 |
| MB Structural Bonding Ltd | Construction | 2023 |
| MB Trade House Ltd | Information & communication | 2020 |
| Mbcsellers Limited | Wholesale & retail | 2023 |
| MBF Heating Ltd | Construction | 2026 |
| MBH Builders (CN) Ltd | Water & waste | 2012 |
| MBK9 Security Service Ltd | Administrative & support | 2025 |
| MBR Trader Ltd | Administrative & support | 2025 |
| Mbridz Ltd | Information & communication | 2013 |
| Mbsankey Ltd | Agriculture & fishing | 2025 |
| Mbvitalproperties Ltd | Real estate | 2026 |
| MBZ Trades Ltd | Financial services | 2026 |
| Mbzibain Family Group Limited | Real estate | 2024 |
| Mbzibain Management Group Ltd | Real estate | 2026 |
| MC 21 Services Ltd | Professional & scientific | 2025 |
| MC Carpentry (Shropshire) Ltd | Construction | 2019 |
| MC Partenope Ortho Ltd | Professional & scientific | 2025 |
| MCA Driving Services Ltd | Transport & logistics | 2026 |
| Mcateer Agri Services Ltd | Financial services | 2023 |
| Mcautos Ltd | Wholesale & retail | 2026 |
| MCC Online Services Ltd | Wholesale & retail | 2025 |
| MCD Property Solutions Ltd | Real estate | 2018 |
| Mcdanisa Group Limited | Transport & logistics | 2020 |