| MN Consulting Ltd | Information & communication | 2023 |
| MN2NN Ltd | Wholesale & retail | 2024 |
| Mobile Tyre Experts Ltd | Wholesale & retail | 2023 |
| Mobile Tyre London Ltd | Wholesale & retail | 2024 |
| Mokili Makambo Limited | Other services | 2018 |
| Molecule Aesthetics Ltd | Other services | 2024 |
| Molyneux Lyons Holdings Ltd | Real estate | 2018 |
| Momi Supervisor Retailers Ltd | Wholesale & retail | 2025 |
| Moneez Ltd | Wholesale & retail | 2024 |
| Monfade Limited | Health & social care | 2022 |
| Montas Legal Ltd | Professional & scientific | 2018 |
| MON£¥ Hungr¥ Ltd | Wholesale & retail | 2020 |
| Moon IS Ltd | Other services | 2025 |
| Mooninterprise Ltd | Wholesale & retail | 2025 |
| Moreland Property Management Ltd | Real estate | 2010 |
| Moriah Pharma Services(Mps) Limited | Administrative & support | 2017 |
| Moss BE Love Ltd | Manufacturing | 2022 |
| Mosys UK Ltd | Information & communication | 2017 |
| MOT Village 2 Ltd | Wholesale & retail | 2024 |
| Motexu Builds Ltd | Construction | 2026 |
| Mound Construction Limited | Construction | 2015 |
| Moup Dirt Services Ltd | Administrative & support | 2022 |
| Moving With Meyers Ltd | Transport & logistics | 2022 |
| Moving With Myers Ltd | Other services | 2017 |
| Movingmutual UK C.I.C. | Information & communication | 2026 |
| Moxy Catering & Events Ltd | Hospitality | 2022 |
| Mozammel Foundation Community Interest Company | Education | 2022 |
| Mozammel Tours Ltd | Administrative & support | 2025 |
| MP & Shan Property UK Ltd | Real estate | 2024 |
| MP Archviz Design 3D Visuals Limited | Professional & scientific | 2020 |
| MPD Smash Cleaning Limited | Construction | 2024 |
| MPM1 Ltd | Real estate | 2025 |
| Mpsc Ventures Ltd | Information & communication | 2022 |
| MR & Miss Teen Nigeria UK CIC | Education | 2024 |
| MR Azura Limited | Wholesale & retail | 2024 |
| MR Charles Michaels Limited | Transport & logistics | 2025 |
| MR Mango Wala Ltd | Wholesale & retail | 2025 |
| MR Munch Ltd | Hospitality | 2025 |
| Mr&Mrs Myers Homes Ltd | Construction | 2020 |
| MR. Peps Labs Ltd | Wholesale & retail | 2026 |
| MR. Peps Ltd | Wholesale & retail | 2025 |
| MRK Creative Ltd | Arts & recreation | 2024 |
| MS Darbar Hyderabadi Ltd | Hospitality | 2025 |
| MS Fresh Food Ltd | Hospitality | 2026 |
| MS Good Deals Limited | Wholesale & retail | 2017 |
| MS Tax & Accountancy Services Ltd. | Professional & scientific | 2014 |
| MS11 Construction Ltd | Construction | 2020 |
| MSM Heating Ltd | Construction | 2022 |
| MSS Properties Investments Limited | Real estate | 2025 |
| MT Pleasant Services Ltd | Hospitality | 2020 |
| MTN Clothes&Fashion Ltd | Wholesale & retail | 2026 |
| Mttmh Holdings Ltd | Real estate | 2023 |
| Mughal & Construction Ltd | Construction | 2020 |
| Muharram Foods Limited | Hospitality | 2022 |
| Mulongo Ltd | Health & social care | 2019 |
| Multicell Ltd | Administrative & support | 2019 |
| Mundo Lusitano Limited | Hospitality | 2022 |
| Munee K9 FM Limited | Administrative & support | 2026 |
| Murry Building Services Ltd | Other services | 2020 |
| Murry Ltd | Construction | 2006 |
| Mushu Electrical Limited | Construction | 2017 |
| Music Teaching Rooms Limited | Education | 2022 |
| Musok Ltd | Health & social care | 2015 |
| MUY Limpio Limited | Administrative & support | 2022 |
| MW Building Services Contractors Ltd | Construction | 2026 |
| My Carwash Ltd | Other services | 2016 |
| My Stay London Ltd | Hospitality | 2017 |
| Mychoice Childcare Ltd | Health & social care | 2024 |
| Mymomo Ltd | Information & communication | 2022 |
| Myra & Baylis Limited | Real estate | 2018 |
| Myvital Keep Healthy Limited | Wholesale & retail | 2026 |
| Myvra Ltd | Health & social care | 2026 |
| MZ Consulting Limited | Administrative & support | 2018 |
| MZ Pharmexcellency Ltd | Wholesale & retail | 2024 |
| MZZ Maintenance & Cleaning Ltd | Administrative & support | 2022 |
| Mèlasun Ltd | Wholesale & retail | 2025 |
| N Todorov Ltd | Construction | 2013 |
| N&N Plus Ltd | Construction | 2023 |
| N&S Cleaning Services Ltd | Administrative & support | 2019 |
| N&W Ltd | Real estate | 2021 |
| N2 Services Limited | Wholesale & retail | 2019 |
| NA Glass Systems Ltd | Construction | 2017 |
| Naagyeo Company Limited | | 2008 |
| Nachman Holdings Ltd | Manufacturing | 2022 |
| Naijamall Limited | Information & communication | 2020 |
| Nails by Mets Ltd | Other services | 2016 |
| Nakwart Catering Services Limited | Hospitality | 2023 |
| Naluz Ltd | Wholesale & retail | 2026 |
| Nami 2022 Limited | Construction | 2026 |
| Nana Otuah Limited | Real estate | 2024 |
| Nananom Groceries Ltd | Wholesale & retail | 2017 |
| Nananom Limited | Transport & logistics | 2016 |
| Nancares Limited | Health & social care | 2015 |
| Nandhu's Construction & Developments Limited | Construction | 2026 |
| Naptec Healthcare Services Ltd | Public administration | 2023 |
| NAQ Supported Living Ltd | Health & social care | 2026 |
| Naruto Luxe Events Limited | Professional & scientific | 2026 |
| NAS Customs Ltd | Wholesale & retail | 2025 |
| Nasze Radio Limited | Information & communication | 2022 |
| Nation Waste Ltd | Water & waste | 2021 |