| Maverick Loanco Limited | Financial services | 2020 |
| Maverick Midco Limited | Financial services | 2017 |
| Maverick Security Ltd | Administrative & support | 2021 |
| Maverick Topco Limited | Financial services | 2017 |
| Maxi-Mize Health Solution Limited | Public administration | 2023 |
| Maxim Recruitment Services Limited | Administrative & support | 2025 |
| Maxtech IT and Security Solutions Limited | Information & communication | 2022 |
| MB Plastics Ltd | Manufacturing | 2008 |
| MB Psychology Ltd | Health & social care | 2025 |
| MB Retail Distribution Ltd | Transport & logistics | 2022 |
| MBM Logistics Ltd | Transport & logistics | 2022 |
| MBM Staffing Solutions Ltd | Administrative & support | 2026 |
| MBS Specialist Consultants Ltd | Professional & scientific | 2025 |
| MCA Delivery Ltd | Transport & logistics | 2023 |
| Mcdraftski Limited | Professional & scientific | 2003 |
| Mcevoy and ROE Ltd | Hospitality | 2021 |
| Mcfeaze Ltd | Professional & scientific | 2016 |
| MCM Roofing Limited | Construction | 2020 |
| Mcmillan Motorsport Holdings Limited | Financial services | 2024 |
| Mcqueen's Digital Ltd | Information & communication | 2014 |
| MCT Electrical Services Limited | Construction | 2016 |
| MCT Facilities Group Ltd | Financial services | 2023 |
| MCT Fire and Security Ltd | Construction | 2023 |
| Mcvick Limited | Professional & scientific | 2019 |
| MD Furniture Ltd | Wholesale & retail | 2018 |
| MDC Property Solutions Limited | Real estate | 2018 |
| Mdcr Retail Ltd | Wholesale & retail | 2020 |
| MDH Tech Limited | Wholesale & retail | 2026 |
| MDM Beauty Limited | Other services | 2023 |
| MDP Roofing Limited | Construction | 2016 |
| MDZ Jewellers Limited | Wholesale & retail | 2025 |
| Meadow Property Maintenance Limited | Other services | 2007 |
| Meadow Property Services Limited | Households | 2025 |
| Meadville Court (Torquay) Limited | Households | 1984 |
| Meakin Solutions Ltd | Professional & scientific | 2018 |
| Mealtimes Matter CIC | Education | 2024 |
| Medforth & Youngman Interiors Ltd | Construction | 2021 |
| Medical Imaging Support Services Ltd | Transport & logistics | 2025 |
| Medical Moulded Products Ltd | Manufacturing | 2015 |
| Medicare Aesthetic London Ltd | Wholesale & retail | 2025 |
| Meem and Meem Ltd | Real estate | 2025 |
| Meister Reliable Mandate Ltd | Education | 2021 |
| Mellor Drive Developments Limited | Real estate | 2021 |
| Mellor Properties Burton Limited | Real estate | 2015 |
| MEM Plus Ltd | Transport & logistics | 2019 |
| Mendare Ltd | Transport & logistics | 2023 |
| Mens Haircutters Limited | Other services | 2003 |
| Mentis Group Holding Ltd | Financial services | 2024 |
| Merc Tech Maintenance Limited | Wholesale & retail | 2018 |
| Mercer Major Fauld Ltd | Agriculture & fishing | 2022 |
| Mercer Major Partners LLP | | 2016 |
| Mercia Events & Production Limited | Arts & recreation | 2024 |
| Mercia Fit Limited | Arts & recreation | 2016 |
| Mercia Fleet Services Ltd | Wholesale & retail | 2024 |
| Mercia Innovative Developments Ltd | Construction | 2025 |
| Mercia Transport Services Ltd | Transport & logistics | 2025 |
| Mercia Wood Fired Pizzas Ltd | Hospitality | 2021 |
| Mercian Financial Solutions Ltd | Professional & scientific | 2025 |
| Mercury Holdings Limited | Professional & scientific | 2026 |
| Merevale Building & Restoration Ltd | Manufacturing | 2023 |
| Merico Limited | Administrative & support | 2008 |
| Meridien Directors Limited | Extraterritorial | 2006 |
| Merlin Developments (Burton) Limited | Manufacturing | 2005 |
| Merlin Flying Club Limited | Education | 1962 |
| Merricare Ltd | Health & social care | 2023 |
| Messina Search Limited | Administrative & support | 2019 |
| Metaforge Holdings Ltd | Information & communication | 2025 |
| MEV Accessories Ltd | Wholesale & retail | 2023 |
| Mezzo Sales Services Limited | Information & communication | 2016 |
| MFA UK Services Ltd | Other services | 2025 |
| MFM Contracting Limited | Other services | 2023 |
| MFQ Services Ltd | Professional & scientific | 2012 |
| MGK Trans Ltd | Transport & logistics | 2016 |
| MGM Business Consulting Ltd | Professional & scientific | 2023 |
| MHZ Properties Ltd | Real estate | 2018 |
| MIA Incorporation Ltd | Financial services | 2025 |
| Micmak Transport Ltd | Transport & logistics | 2022 |
| Micro Brew Radio Ltd | Arts & recreation | 2020 |
| Micro EXP Ltd | Information & communication | 2025 |
| Midas Touch Health Ltd | Health & social care | 2025 |
| Midco Toys Ltd | Wholesale & retail | 2007 |
| Middleton Heating Limited | Construction | 2006 |
| Midland Brick Fabrications Limited | Manufacturing | 2006 |
| Midland Brick Solutions Limited | Construction | 2019 |
| Midland Electrical Installations Limited | Construction | 2023 |
| Midland Finance Limited | Financial services | 2019 |
| Midland Fire (Burton-On-Trent) Ltd | Extraterritorial | 1999 |
| Midland Fire Holdings Ltd | Financial services | 2024 |
| Midland Fleet Commercials Ltd | Administrative & support | 2020 |
| Midland Fleet Group Limited | Financial services | 2025 |
| Midland Fleet Property Ltd | Real estate | 2025 |
| Midland Fleet Support Ltd | Wholesale & retail | 2017 |
| Midland Heating and Plumbing Services Limited | Construction | 2018 |
| Midland Occupational Therapy Services Limited | Health & social care | 2013 |
| Midland PIG Producers Limited | Agriculture & fishing | 1970 |
| Midland Road Maintenance Limited | Construction | 2001 |
| Midland Vehicle Transport Ltd | Transport & logistics | 2019 |
| Midlands Cars Ltd | Wholesale & retail | 2017 |
| Midlands Civils & Piling Solutions Ltd | Construction | 2025 |
| Midlands Drinks Wholesale Ltd | Wholesale & retail | 2026 |