| Malmort Ltd | Wholesale & retail | 2024 |
| Malssan Enterprises Ltd | Information & communication | 2020 |
| Malssan Housing Ltd | Wholesale & retail | 2014 |
| Malt Mill Developments Limited | Construction | 2022 |
| Maltings Property Management Limited | Households | 1990 |
| Malvern Green Properties Ltd | Real estate | 2026 |
| Malvern Nominees Limited | Professional & scientific | 2001 |
| Malvern Plastics Limited | Extraterritorial | 1976 |
| Malvern Scientific Expert Witness Limited | Professional & scientific | 2009 |
| Malvern Scientific Solutions Ltd | Manufacturing | 1998 |
| Mama MIA Consultancy Limited | Professional & scientific | 2022 |
| Mamtrial Ltd | Wholesale & retail | 2024 |
| Mamu&Bagnah Ltd | Other services | 2018 |
| Mana Vape Limited | Wholesale & retail | 2023 |
| Manchester Hydraulics Limited | Manufacturing | 2001 |
| Mandragon Management LLP | | 2026 |
| Mango Vehicle Hire Limited | Administrative & support | 2018 |
| Mani Mini Limited | Information & communication | 2014 |
| Mania Promotional Events Limited | Administrative & support | 2026 |
| Manica Healthcare Ltd | Wholesale & retail | 2023 |
| Maniek FC Ltd | Transport & logistics | 2021 |
| Mann Holding Investments Ltd | Financial services | 2025 |
| Mannshakes Limited | Wholesale & retail | 2014 |
| Manny's Car and Commercial Workshop Ltd | Wholesale & retail | 2024 |
| Manor Barn PUB Co Ltd | Hospitality | 2022 |
| Manor Electrical & Lighting Ltd | Construction | 2017 |
| Manor Farm Community Services Ltd. | Hospitality | 1988 |
| Manor Parking Limited | Real estate | 2018 |
| Manor Pharmacy Limited | Wholesale & retail | 2009 |
| Manorhouse Fish Bar Limited | Professional & scientific | 2003 |
| Manraj Sran Ltd | Wholesale & retail | 2025 |
| Manreet Limited | Transport & logistics | 2024 |
| Manro Holdings Ltd | Financial services | 2022 |
| Mansfield Wings Limited | Hospitality | 2023 |
| Mansoor Haider Naqvi Ltd | Wholesale & retail | 2024 |
| Mansur and Furhat Ltd | Manufacturing | 2025 |
| Mantacus Ltd | Administrative & support | 2022 |
| Manz International Limited | Transport & logistics | 2018 |
| Manz London Limited | Information & communication | 2017 |
| Maple Care Services Ltd | Health & social care | 2025 |
| Maple Leaf (Wolverhampton) Residents Association Limited | Households | 1988 |
| Maple Oak Properties Ltd | Real estate | 2023 |
| Mapletree Nursery & Preschool Ltd | Education | 2013 |
| Mapseeker Archive Publishing Limited | Wholesale & retail | 2010 |
| MAQ Accounts Limited | Construction | 2019 |
| MAQ Buliding Construction Limited | Real estate | 2023 |
| MAQ Foods Limited | Hospitality | 2018 |
| MAQ Solutions Limited | Information & communication | 2019 |
| MAQ Technologies Limited | Hospitality | 2018 |
| Maqzeezo Ltd | Wholesale & retail | 2024 |
| MAR Gregorios Properties Limited | Real estate | 2022 |
| Mara Events Ltd | Wholesale & retail | 2024 |
| Maranavic Ltd | Construction | 2024 |
| Marcel Haulage Ltd | Transport & logistics | 2016 |
| Marchbrown Limited | Real estate | 1954 |
| Marches Centre of Manufacturing and Technology C.I.C. | Professional & scientific | 2016 |
| Marciabeverley Ltd | Health & social care | 2023 |
| Marcin Concrete Repairs Ltd | Construction | 2019 |
| Marclad Limited | Construction | 2006 |
| Marcli Limited | Real estate | 2003 |
| Marcoexpress Partner Ltd | Transport & logistics | 2025 |
| Marcoo Ltd | Manufacturing | 2025 |
| Marcos Install Limited | Construction | 2019 |
| Marcus Gear Inc Limited | Wholesale & retail | 2021 |
| Marcus Gear Ltd. | Wholesale & retail | 2021 |
| Margstone Support Solutions Ltd | Health & social care | 2022 |
| Margurites of Leamore Limited | Wholesale & retail | 2022 |
| Marham Logistics Limited | Transport & logistics | 2024 |
| Mariam Barkat Limited | Real estate | 2019 |
| Marigate Limited | Real estate | 2025 |
| Marillo ASB Transport Ltd | Transport & logistics | 2014 |
| Marilou Zamora Limited | Health & social care | 2014 |
| Marina Ventures Limited | Wholesale & retail | 2025 |
| Marinated Limited | Financial services | 2024 |
| Marine Aquatics Limited | Agriculture & fishing | 2013 |
| Marine Fabrications (Staffordshire) Limited | Manufacturing | 1999 |
| Marius Ulesteanu Ltd | Administrative & support | 2018 |
| Mariwan Phone Ltd | Wholesale & retail | 2025 |
| Mariya J Ltd | Other services | 2025 |
| Marj's Shakes Ltd | Hospitality | 2025 |
| Mark a Robbins Ltd | Transport & logistics | 2023 |
| Mark Auto Services (Walsall) Ltd | Wholesale & retail | 2020 |
| Mark Rainer Limited | Wholesale & retail | 1974 |
| Marketing Samurai Limited | Professional & scientific | 2014 |
| Marketing Services Limited | Manufacturing | 2001 |
| Markis Re&Cc Limited | Real estate | 2023 |
| Marko (UK) Ltd | Construction | 2005 |
| Marnhull Hold Co Limited | Financial services | 2026 |
| Maroon Capital Limited | Financial services | 2023 |
| Marrion & Co Limited | Real estate | 2015 |
| Marrion 4 X 4 Limited | Wholesale & retail | 2019 |
| Marrocco & Family Ltd | Manufacturing | 2015 |
| Marsawest Ltd | Wholesale & retail | 2025 |
| Marsgservices Ltd | Health & social care | 2021 |
| Marstan Business Centre Limited | Administrative & support | 2019 |
| Martex Services Limited | Administrative & support | 2011 |
| Martian Batteries Ltd | Manufacturing | 2026 |
| Martin Anthony Design Limited | Other services | 2018 |
| Martin Holdings (Walsall) Limited | Professional & scientific | 1996 |
| Martin Philip Plumbing Ltd | Construction | 2021 |