| Muchenje Enterprises Ltd | Other services | 2020 |
| Muchie Holdings Limited | Financial services | 2025 |
| Muchosmedia Limited | Information & communication | 2008 |
| Muddy Dog Property Developments Limited | Construction | 2021 |
| Mudek Freight Care Limited | Health & social care | 2025 |
| Mudhe Care Limited | Health & social care | 2017 |
| Muffario Limited | Wholesale & retail | 2025 |
| Mughal Driving School Leicester Ltd | Education | 2022 |
| Mughal School of Motoring Ltd | Education | 2016 |
| Mugisha Estates Ltd | Real estate | 2024 |
| Mugrum Ltd | Health & social care | 2014 |
| Muhammad Hassan Consulting Limited | Information & communication | 2023 |
| Muhammad Shahzad Dreamz Ltd | Wholesale & retail | 2025 |
| Muhammad Zaman Ltd | Wholesale & retail | 2023 |
| Muhammd Qamar Zaman Ltd | Wholesale & retail | 2024 |
| Muir Designs Limited | Wholesale & retail | 2013 |
| Muirhead Aerospace Limited | Manufacturing | 1956 |
| Muizza Ltd | Information & communication | 2025 |
| MUK Limited | Wholesale & retail | 2022 |
| Mukadam Engineering Ltd | Professional & scientific | 2024 |
| Mukesh Parmar Leisure Limited | Arts & recreation | 2010 |
| Mukta Healthcare Limited | Health & social care | 2013 |
| Mukyline Ltd | Wholesale & retail | 2026 |
| Mulashaker Limited | Manufacturing | 2020 |
| Mulberry (Northants) Limited | Extraterritorial | 2022 |
| Mulberry Global Estate Ltd | Real estate | 2021 |
| Mulberry Meadows Ltd | Administrative & support | 2020 |
| Mulberry Meadows of London Ltd | Administrative & support | 2020 |
| Mulberry Pharma Ltd | Wholesale & retail | 2018 |
| Mulham Tech Solutions Ltd. | Information & communication | 2018 |
| Mulini DI Zolfo Limited | Extraterritorial | 2009 |
| Mulk Holdings Limited | Real estate | 2003 |
| Mulla & Sons Ltd | Wholesale & retail | 2022 |
| Mulla Deals Ltd | Wholesale & retail | 2024 |
| Mulla Locums Ltd | Professional & scientific | 2023 |
| Mulla Recovery Limited | Wholesale & retail | 2016 |
| Mullaji Group Limited | Wholesale & retail | 2025 |
| Mullenspond Transport Ltd | Transport & logistics | 2014 |
| Multani Transporters Ltd | Transport & logistics | 2025 |
| Multi Vehicle Technology Limited | Manufacturing | 2015 |
| Multi-Choice (Midlands) Ltd | Wholesale & retail | 2023 |
| Multi-Translation Limited | Professional & scientific | 2016 |
| Multionyx LLP | | 2026 |
| Multiplese Ltd | Transport & logistics | 2021 |
| Multisave Supplier Ltd | Wholesale & retail | 2019 |
| Multiskilled MAN With Van Ltd | Professional & scientific | 2023 |
| Multisource Media Ltd | Information & communication | 2024 |
| Multiwork 501 Ltd | Professional & scientific | 2014 |
| Multiwork 502 Ltd | Professional & scientific | 2014 |
| Multiwork 503 Ltd | Administrative & support | 2014 |
| Multiwork 504 Ltd | | 2015 |
| Multiwork 505 Ltd | | 2015 |
| Multiwork Adapt Ltd | | 2015 |
| Multiwork Group Ltd | | 2015 |
| Multiwork Jobs Ltd | Administrative & support | 2012 |
| Multiwork PAY Ltd | | 2015 |
| Mumbai Catering Company Ltd | Hospitality | 2025 |
| Mumbai Chopatti Ltd | Hospitality | 2025 |
| Mumentum Group Holding Ltd | Wholesale & retail | 2025 |
| Mumkin Limited | Wholesale & retail | 2024 |
| Munch Box 57 Ltd | Hospitality | 2024 |
| Munchbox Eco Friendly Limited | Wholesale & retail | 2024 |
| Munchies Halal Bakery Ltd | Hospitality | 2018 |
| Munchies Machine Ltd | Wholesale & retail | 2026 |
| Munchout Ltd | Hospitality | 2025 |
| Mundi Properties Limited | Real estate | 2024 |
| Muni P Properties Limited | Real estate | 2026 |
| Munich Motorsport Ltd | Wholesale & retail | 2022 |
| Munnabhai Electrician UK Limited | Professional & scientific | 2014 |
| Munnabhai Properties Ltd | Real estate | 2020 |
| Munro Consultancy Limited | Real estate | 2022 |
| Munroe & Sons Fabrication Ltd | Manufacturing | 2024 |
| Munshi Car Sales Ltd | Wholesale & retail | 2025 |
| Munshi Computers Ltd | Other services | 2010 |
| Munton Scaffolding Limited | Construction | 2024 |
| MUP Investments Ltd | Health & social care | 2025 |
| Mupondi. J Limited | Health & social care | 2016 |
| Muppattan Ltd | Wholesale & retail | 2026 |
| Murads UX Limited | Information & communication | 2021 |
| Muraj Limited | Real estate | 2024 |
| Murdock Intellective Consulting Limited | Other services | 2016 |
| Murgafeed PVT Ltd | Hospitality | 2024 |
| Murhan Transport Limited | Transport & logistics | 2026 |
| Murney & Sons Ltd | Construction | 2025 |
| Murphy Philipps Architects Limited | Professional & scientific | 1997 |
| Murray Healthcare Services Ltd | Health & social care | 2020 |
| Murray Property Management Limited | Real estate | 2011 |
| Murreez Ltd | Wholesale & retail | 2023 |
| Murtel Properties Ltd | Real estate | 2021 |
| Murva Wealth Consultancy Ltd | Financial services | 2017 |
| MUS Sofrasi Ltd | Hospitality | 2026 |
| Musa Smiles Ltd | Health & social care | 2025 |
| Musa Top 10 Limited | Wholesale & retail | 2026 |
| Musa&Zeyen Limited | Hospitality | 2017 |
| Musamedics Limited | Professional & scientific | 2020 |
| Musanet Ltd | Wholesale & retail | 2024 |
| Musani Ecom Limited | Wholesale & retail | 2025 |
| Musani Limited | Real estate | 2006 |
| Muscle Alchemy Limited | Health & social care | 2020 |
| Muscle MOB Ltd | Health & social care | 2026 |