| Metafin Group Holdings Limited | Manufacturing | 1980 |
| Metafin Group Limited | Financial services | 2021 |
| Metafin Limited | Administrative & support | 2018 |
| Metal Processes Holdings Limited | Manufacturing | 2017 |
| Metal Products Business Park Limited | Real estate | 2008 |
| Metal Products Stillages Limited | Manufacturing | 2018 |
| Metal Technique Limited | Manufacturing | 2009 |
| Metalforms Engineering Limited | Manufacturing | 1992 |
| Metallia Ltd | Construction | 2018 |
| Metemall Global Trading Ltd | Extraterritorial | 2022 |
| Method + Motion Limited | Health & social care | 2025 |
| Meticulous Diagnostics Ltd | Public administration | 2024 |
| Metimur Global Ltd | Information & communication | 2023 |
| Metoxal U.K. Limited | Manufacturing | 1998 |
| Metres Direct Ltd | Manufacturing | 2017 |
| Metro Couriers Limited | Transport & logistics | 2025 |
| Metromore Ltd | Real estate | 2004 |
| Metsol Ltd | Manufacturing | 2022 |
| Mettaminds CIC | Education | 2020 |
| Meya Holdings Ltd | Financial services | 2019 |
| MF Manufacturing Ltd | Manufacturing | 1993 |
| Mfautoparts Limited | Wholesale & retail | 2024 |
| MFG Holdings Limited | Professional & scientific | 2008 |
| Mfmdr Ltd | Transport & logistics | 2025 |
| MFS Cold Storage & Logistics Limited | Transport & logistics | 2023 |
| MFS Seafoods Limited | Wholesale & retail | 2006 |
| MFT Commercial Ltd | Transport & logistics | 2010 |
| MG Bazaar Ltd | Wholesale & retail | 2021 |
| MG Financial Services (GB) Limited | Administrative & support | 2000 |
| MG Foods Ltd | Wholesale & retail | 2023 |
| MG Profit Accounting Services Limited | Professional & scientific | 2024 |
| MG UK Events Ltd | Other services | 2022 |
| Mgid Builders Ltd | Construction | 2021 |
| MGM UK Enterprises Ltd | Wholesale & retail | 2019 |
| MGR FC Ltd | Arts & recreation | 2025 |
| MH Property (Walsall) Ltd | Real estate | 2024 |
| MH Surveying Limited | Professional & scientific | 2022 |
| MH1 International Ltd | Wholesale & retail | 2023 |
| MH5 Accountancy Ltd | Professional & scientific | 2025 |
| MHB Courier Service Ltd | Transport & logistics | 2021 |
| Mherakhee Ltd | Wholesale & retail | 2024 |
| MHM Medical Ltd | Health & social care | 2024 |
| MHO Quanta Ltd | Information & communication | 2025 |
| MI Amor Holdings Limited | Administrative & support | 2025 |
| MI Amor Walsall Ltd | Hospitality | 2023 |
| MI Casa Care (UK) Ltd | Health & social care | 2019 |
| MI Cloud 365 Limited | Information & communication | 2018 |
| MI Diamonds Limited | Manufacturing | 2012 |
| MI Neat Trading Group Ltd | Administrative & support | 2020 |
| MIA Heating Services Limited | Construction | 1999 |
| Miah WM Ltd | Transport & logistics | 2024 |
| MIC Travel Ltd | Administrative & support | 2022 |
| Michael Ajadi Ltd | Professional & scientific | 2025 |
| Michael Charles Galyas Limited | Hospitality | 2012 |
| Michael Dell & Associates Limited | Professional & scientific | 2003 |
| Michael John Stoves & Greener Heating Ltd | Construction | 2014 |
| Michael Popper Associates LLP | | 2002 |
| Michaels Mentors Ltd | Education | 2020 |
| Michelle and Duncan Music Ltd | Wholesale & retail | 2026 |
| Mick Fernyhough Vehicle Repairs Limited | Wholesale & retail | 2007 |
| Mico Systems Limited | Information & communication | 2007 |
| Microline Tunnelling Limited | Construction | 1990 |
| Micrologix Limited | Information & communication | 2021 |
| Midas Accountants & Business Consultants Limited | Professional & scientific | 1995 |
| Midas Audits Limited | Professional & scientific | 2011 |
| Midas Security Services Limited | Administrative & support | 2018 |
| Midcom Limited | Information & communication | 2012 |
| Midda's Fast Freight Limited | Administrative & support | 2010 |
| Middlemore Motors Limited | Wholesale & retail | 2005 |
| Middlemore Motors Transport Limited | Transport & logistics | 2013 |
| Middleton Range & Services Limited | Manufacturing | 2011 |
| Middleton Traditional Joinery Ltd | Construction | 2002 |
| Midemich Hair & Locs Place Ltd | Other services | 2025 |
| Midfab Limited | Manufacturing | 2018 |
| Midhillentertainment Limited | Arts & recreation | 2024 |
| Midland Assess Energy 2025 Limited | Professional & scientific | 2025 |
| Midland Auto Centre Ltd | Wholesale & retail | 2020 |
| Midland Auto Transport Ltd | Transport & logistics | 2025 |
| Midland Autocare Ltd | Wholesale & retail | 2011 |
| Midland Bacon Company Limited | Extraterritorial | 1995 |
| Midland Car Collections Ltd | Wholesale & retail | 2024 |
| Midland Car Group Ltd | Wholesale & retail | 2021 |
| Midland Car Repairs Ltd | Wholesale & retail | 2023 |
| Midland Car Trader Limited | Wholesale & retail | 2025 |
| Midland Care Homes Ltd | Health & social care | 2016 |
| Midland Cold Rolled Sections Limited | Manufacturing | 2008 |
| Midland Conservation (Maintenance) Limited | Construction | 2013 |
| Midland Conservation Ltd | Construction | 2007 |
| Midland Construction Services (UK) Limited | Construction | 2008 |
| Midland Construction Works Ltd | Construction | 2025 |
| Midland Contracts & Partners Ltd | Construction | 2025 |
| Midland Couriers Ltd | Transport & logistics | 2026 |
| Midland Custom Worx Limited | Wholesale & retail | 2023 |
| Midland Decorative Surfaces Ltd | Construction | 2001 |
| Midland Diamond Abrasives Ltd | Manufacturing | 2011 |
| Midland Driveways Ltd | Construction | 2020 |
| Midland Driving Academy Limited | Other services | 2022 |
| Midland Elevator Installations Ltd | Construction | 2014 |
| Midland Flower Company Limited | Wholesale & retail | 1986 |
| Midland FR8 Ltd | Transport & logistics | 2025 |