| Mssa Properties (UK) Limited | Real estate | 2024 |
| Mssnr Ltd | Real estate | 2022 |
| MST Builders Ltd | Construction | 2025 |
| MT Bodywork Ltd | Construction | 2026 |
| MT Global Limited | Financial services | 2005 |
| MT Home Rent Ltd | Real estate | 2023 |
| MT Residence Ltd | Real estate | 2022 |
| MT Security Ltd | Administrative & support | 2020 |
| MT UK Trading Ltd | Transport & logistics | 2016 |
| MTA Rail Ltd | Construction | 2026 |
| MTA Specialists Ltd. | Administrative & support | 2016 |
| Mtab Pharma Ltd | Health & social care | 2017 |
| MTK Transport Ltd | Transport & logistics | 2023 |
| MTM Estate Group Ltd | Real estate | 2021 |
| MTM Financial and Management Accountants Ltd | Professional & scientific | 2014 |
| MTM Sahara Ltd | Hospitality | 2018 |
| MTO Buy to Lets Limited | Real estate | 2017 |
| MTO Enterprises Limited | Construction | 2013 |
| MTO Investments Limited | Real estate | 2014 |
| MTP Ltd | Professional & scientific | 2025 |
| MTS Building Consultancy Ltd | Professional & scientific | 2025 |
| MTS Civils Limited | Construction | 2026 |
| MTS United Limited | Professional & scientific | 2019 |
| Mtsl Limited | Administrative & support | 2016 |
| Mtss Investments Ltd | Other services | 2015 |
| Mtsuk Ltd | Wholesale & retail | 2025 |
| MU Builders Ltd | Construction | 2023 |
| Muaaz Logistics and Supply Chain (MLS) Ltd | Wholesale & retail | 2024 |
| Mubaarak.A Limited | Health & social care | 2023 |
| MUD Wellington Boots Limited | Wholesale & retail | 2016 |
| Mudzingwa PVT Ltd | Health & social care | 2016 |
| Mugal Properties Ltd | Real estate | 2023 |
| Mughal E-Tradings Ltd | Wholesale & retail | 2023 |
| Muhalil Ltd | Professional & scientific | 2021 |
| Muhammad Azim Furniture Limited | Information & communication | 2026 |
| Muhammad Nawaz Limited | Wholesale & retail | 2025 |
| Muharai Bakes Limited | Wholesale & retail | 2022 |
| MUHAWAQAR70 Ltd | Wholesale & retail | 2024 |
| Muhss IT Serv Ltd | Construction | 2024 |
| Muhtady Investments Limited | Real estate | 2026 |
| MUJ IT Contracting Limited | Information & communication | 2019 |
| MUJ Limited | Wholesale & retail | 2022 |
| Muje Services Ltd | Hospitality | 2023 |
| Mukambi Care Limited | Health & social care | 2013 |
| Mukenge's BNB Ltd | Hospitality | 2025 |
| Mukthar Cars Ltd | Administrative & support | 2011 |
| Mulamind Ltd | Wholesale & retail | 2024 |
| Mullins Ltd. | Professional & scientific | 2008 |
| Mulmar Group Ltd | Professional & scientific | 2007 |
| Multi Klin Ltd | Hospitality | 2019 |
| Multi Lingual World Limited | Education | 2018 |
| Multi Utility Ltd | Construction | 2022 |
| Multiautotech Ltd | Wholesale & retail | 2024 |
| Multimedia (UK) Limited | Professional & scientific | 1997 |
| Multiv Limited | Wholesale & retail | 2024 |
| Muminkhan Ltd | Health & social care | 2021 |
| Mummyfit (Luton) Ltd | Arts & recreation | 2019 |
| Muncheez Limited | Hospitality | 2020 |
| Muneeb Global Ltd | Wholesale & retail | 2026 |
| Munin AUC Limited | Real estate | 2024 |
| Munir Holdings Ltd | Financial services | 2019 |
| Muntyy Ltd | Wholesale & retail | 2026 |
| Murabiyoon Ideas Ltd | Education | 2022 |
| Murabiyoon Ltd | Education | 2021 |
| Murderedbmwgxng Ltd | Other services | 2021 |
| Murganos Luton Ltd | Hospitality | 2024 |
| Murphy Eco Construction Limited | Construction | 2014 |
| Murphy Land Ltd | Extraterritorial | 2020 |
| Murphy’S Empawium Ltd | Wholesale & retail | 2023 |
| Murrad Ophthalmic Services Ltd | Health & social care | 2013 |
| Murrad Styles Limited | Wholesale & retail | 2016 |
| Murray Support Services Ltd | Health & social care | 2020 |
| Murray.R Ltd | Real estate | 2025 |
| Murshid Global International Limited | Information & communication | 2026 |
| Murtagh Demolition Group Ltd | Construction | 2019 |
| Musa BH Ltd | Other services | 2023 |
| Musa Halal Groups Ltd | Wholesale & retail | 2026 |
| Musa Halal Supermarket Ltd | Wholesale & retail | 2024 |
| Musa Wali ALI Limited | Transport & logistics | 2017 |
| MUSA23 Ltd | Administrative & support | 2019 |
| Musakhan Mart Ltd | Wholesale & retail | 2025 |
| Musa’S Motor Hub Ltd | Wholesale & retail | 2025 |
| Muse Consult Ltd | Information & communication | 2008 |
| Muse Notes Limited | Information & communication | 2025 |
| Musetutoring Ltd | Education | 2026 |
| Mushkoor Foods Ltd | Wholesale & retail | 2013 |
| Mushroom TEC Ltd | Wholesale & retail | 2024 |
| MUSIC24 Trading Ltd | Health & social care | 2018 |
| Musical WAR House Limited | Information & communication | 2021 |
| Muslim Education Services Limited | Education | 2010 |
| Muslim Family Forum Ltd | Education | 2022 |
| Muslim Relief Worldwide | Education | 2020 |
| Mussel Bidco Limited | Financial services | 2024 |
| Mussel Midco 1 Limited | Financial services | 2017 |
| Mussel Midco 2 Limited | Financial services | 2017 |
| Mussel Topco Limited | Financial services | 2017 |
| Mustafa Ahmad Zada Limited | Real estate | 2026 |
| Mustafa Jewellers Limited | Wholesale & retail | 2014 |
| Mustafa Motors Ltd | Wholesale & retail | 2026 |
| Mustafa UK Services Ltd | Transport & logistics | 2022 |