| Manov Ltd | Transport & logistics | 2013 |
| Many International Trading Company Limited | Wholesale & retail | 2026 |
| Maom Ltd | Health & social care | 2015 |
| Maple Leaf Solutions Ltd | Information & communication | 2018 |
| Marbel Ltd | Professional & scientific | 2024 |
| Marblewood Properties Ltd | Real estate | 2023 |
| Marc Lockley & SON Limited | Transport & logistics | 2006 |
| March 11 Co., Ltd | Manufacturing | 2024 |
| Marcolandiconsulting Limited | Information & communication | 2018 |
| Marcon Community Services Limited | Administrative & support | 2018 |
| Marcus Freeman Limited | Wholesale & retail | 2004 |
| Mardle Studios Ltd | Information & communication | 2025 |
| Marina Miron Ltd | Real estate | 2025 |
| Mariusdar Limited | Transport & logistics | 2026 |
| Mark Aston Electrical Limited | Construction | 2021 |
| Mark Beighton Limited | Construction | 2013 |
| Mark Harrod Limited | Manufacturing | 2004 |
| Mark James Hair Limited | Other services | 2023 |
| Mark James Property Ltd | Real estate | 2025 |
| Mark Jaspers Bakeries Limited | Manufacturing | 2010 |
| Mark Redler Solicitors Limited | Professional & scientific | 2006 |
| Mark Stubbs Contractors Ltd | Construction | 2005 |
| Mark Trunkfield Services Limited | Other services | 2019 |
| Market Promotions Limited | Other services | 2014 |
| Markwell Trading Services Ltd | Professional & scientific | 2011 |
| Marm Asset Management Ltd | Professional & scientific | 2020 |
| Marriott Inns Ltd | Hospitality | 2022 |
| Mars Import and Export Limited | Wholesale & retail | 2025 |
| Mars Orbit Trade Limited | Wholesale & retail | 2022 |
| Mars Vision Media Ltd | Wholesale & retail | 2025 |
| Marsgame Ltd | Wholesale & retail | 2021 |
| Marshalls Signs Ltd | Professional & scientific | 2021 |
| Marshall’S Services Ltd | Manufacturing | 2024 |
| Marston Brook Limited | Real estate | 2020 |
| Marston Mini Market Limited | Wholesale & retail | 2022 |
| Marston Search Ltd | Administrative & support | 2024 |
| Marter Electrical Factory Ltd | Wholesale & retail | 2025 |
| Martin Accountancy Services Ltd | Professional & scientific | 2022 |
| Marvo Automation Limited | Wholesale & retail | 2023 |
| Maryfield 18-20 Limited | Extraterritorial | 2011 |
| Mascuge Products Co., Ltd | Extraterritorial | 2018 |
| Maseney Limited | Wholesale & retail | 2025 |
| Mason & Co (Burntwood) Ltd | Hospitality | 2019 |
| Mason & Croft Ltd | Real estate | 2020 |
| Mason Builders (Stafford) Ltd | Construction | 2003 |
| Mason Trading (Midlands) Limited | Professional & scientific | 2014 |
| Master Package Ltd | Manufacturing | 2021 |
| Master Q Ltd | Education | 2021 |
| MAT Dale Music Services Ltd | Administrative & support | 2006 |
| MAT Dale Property Maintenance Limited | Construction | 2013 |
| Match Lake Holdings Ltd | Financial services | 2021 |
| Matco Investments Limited | Other services | 2006 |
| Matco Trading Ltd | Hospitality | 1987 |
| Matrix Universe Co., Ltd. | Extraterritorial | 2010 |
| Matt Carney Ltd | Wholesale & retail | 2022 |
| Matt Wright Ltd | Information & communication | 2017 |
| Mattfoo Ltd | Information & communication | 2022 |
| Mattocks Building & Plumbing Ltd | Construction | 2026 |
| Mavesyn Ridware Residential Home Limited | Health & social care | 2001 |
| MAX Bios Ltd | Wholesale & retail | 2024 |
| MAX Developments & Investments Ltd | Real estate | 2020 |
| MAX Industry Co., Ltd | Extraterritorial | 2015 |
| MAX Investments (Equities) Ltd | Financial services | 2020 |
| MAX Investments (Property) Ltd | Real estate | 2020 |
| MAX Probation Services Limited | Health & social care | 2016 |
| Max&Mini Technology Limited | Information & communication | 2022 |
| Maxair Holdings Ltd | Financial services | 2021 |
| Maximum Detail Ltd | Wholesale & retail | 2024 |
| Maxwell Ashley Ltd | Professional & scientific | 2006 |
| Maxwood Fabrications Limited | Manufacturing | 2018 |
| Maxwood Investments Ltd | Financial services | 2025 |
| Maxwood Washrooms Limited | Construction | 2012 |
| Maya-Zara Ltd | Health & social care | 2026 |
| Mayflower Control Limited | Administrative & support | 1996 |
| Mayflower Sourcing International Limited | Professional & scientific | 2011 |
| Maynos Lena Limited | Information & communication | 2025 |
| Maysun Industry Co., Ltd. | Manufacturing | 2023 |
| MB Restorations Limited | Wholesale & retail | 2017 |
| MB Truck and Plant Services Limited | Administrative & support | 2026 |
| MB Window Cleaning Ltd | Administrative & support | 2013 |
| MBM ABU Hikma Trading Co., Ltd | Wholesale & retail | 2024 |
| Mbmoves Ltd | Water & waste | 2025 |
| Mbtt Medical Limited | Real estate | 2013 |
| MBV Education Ltd | Education | 2018 |
| Mcalpine Investments Ltd | Financial services | 2021 |
| Mcbryan Properties Limited | Real estate | 2021 |
| Mccormick Trading Limited | Other services | 2019 |
| Mcdonald Inns Ltd | Hospitality | 2020 |
| MCF Global Business Solutions Limited | Wholesale & retail | 2009 |
| Mcginty Construction (Stafford) Limited | Construction | 2017 |
| MCH & Co (Holdings) Ltd | Financial services | 2023 |
| MCH & Co. Ltd | Real estate | 2023 |
| Mcmf Ltd | Real estate | 2021 |
| Mcnellan a Limited | Wholesale & retail | 2019 |
| Mcpash Limited | Real estate | 2022 |
| MD Compliance Services Limited | Water & waste | 2015 |
| MD Properties (Staffordshire) Limited | Real estate | 2009 |
| MD Property Buyers Ltd | Real estate | 2020 |
| Mdlong Properties Ltd | Construction | 2018 |
| MDS Technology Group Limited | Wholesale & retail | 2022 |