| Moosejaw Scenic Construction Limited | Construction | 2023 |
| Morchella Limited | Professional & scientific | 2014 |
| Morecare Interiors Limited | Construction | 2017 |
| Morecare Maintenance Limited | Construction | 2007 |
| Moreish CS Ltd | Hospitality | 2026 |
| Morina SVC Limited | Information & communication | 2023 |
| Morlan Properties & Investments Limited | Real estate | 2025 |
| Morlan Properties Limited | Real estate | 2025 |
| Moroccanoil UK Limited | Administrative & support | 2011 |
| Morphism Limited | Information & communication | 2020 |
| Morris Hunters Consultants Ltd | Information & communication | 2020 |
| Mortgage Financial Solutions Ltd | Financial services | 2018 |
| Mortz Ltd | Manufacturing | 2020 |
| Moru Eats Limited | Wholesale & retail | 2023 |
| Moses Consultancy & Trainer Limited | Professional & scientific | 2025 |
| Mosess Sone's Ltd | Transport & logistics | 2016 |
| Moshinko Productions Ltd | Information & communication | 2022 |
| Mosmac Ltd | Real estate | 2016 |
| Mosses Shop Ltd | Construction | 2024 |
| Mother to Mother Limited | Administrative & support | 2017 |
| Motico Ltd | Wholesale & retail | 2025 |
| Motikon Ltd | Professional & scientific | 2016 |
| Motion Fittings Ltd | Wholesale & retail | 2026 |
| Motor Crew Technology Ltd | Transport & logistics | 2025 |
| Motor Serch Limited | Wholesale & retail | 2019 |
| Motorfix Limited | Wholesale & retail | 2009 |
| Mouktaris & Co Ltd | Professional & scientific | 2020 |
| Mount Lodge Properties Limited | Real estate | 2019 |
| Mount Road Property Management Limited | Real estate | 2016 |
| Mountbrook Properties Limited | Real estate | 2002 |
| Mouse in a House Ltd | Information & communication | 2003 |
| Movegenieai Ltd | Transport & logistics | 2025 |
| Moving QUE Ltd | Transport & logistics | 2025 |
| Moving Simplified Limited | Other services | 2025 |
| Moving to the Edge Ltd | Professional & scientific | 2022 |
| Mowab Limited | Real estate | 2024 |
| Mowbray Buildings Ltd | Education | 2019 |
| Moyosore Briggs Ltd | Administrative & support | 2022 |
| Mozzafellas Ltd | Hospitality | 2022 |
| MP Morgen Investments Limited | Real estate | 2024 |
| MP Motors London Ltd | Wholesale & retail | 2024 |
| MPD Build Ltd | Construction | 2024 |
| Mpress Management Services Limited | Professional & scientific | 2013 |
| MPS Investments Ltd | Financial services | 2024 |
| MR & MRS Paget Properties LLP | | 2024 |
| MR Body Repair Ltd | Manufacturing | 2023 |
| MR Fizz Ltd | Professional & scientific | 2009 |
| MR Khaman Limited | Hospitality | 2025 |
| MR Maggoo Films Ltd | Information & communication | 2018 |
| MR Siara Ltd | Construction | 2019 |
| MR. Jawad T/A Feast Hahore Mano Salwa L.P. | | 2012 |
| Mr.Nk Cleaning Services Ltd | Administrative & support | 2025 |
| Mr.Plus Ltd | Public administration | 2024 |
| MRD Management Limited | Construction | 2025 |
| Mrf@Sk Limited | Health & social care | 2022 |
| MRH Global Engineering Limited | Professional & scientific | 2025 |
| MRN08 Ltd | Construction | 2026 |
| MS Nextphase Limited | Construction | 2025 |
| MSI Rail Limited | Construction | 2016 |
| MSM Drylining Limited | Construction | 2021 |
| MSS EU Property Limited | Real estate | 2025 |
| MSS U.K Property Ltd | Real estate | 2021 |
| Mswipe Technologies (UK) Private Limited | Information & communication | 2023 |
| MT Trades and Services Ltd | Other services | 2020 |
| MT Williams Consulting Limited | Professional & scientific | 2019 |
| Mtak Limited | Hospitality | 2008 |
| MTD Estates Ltd | Real estate | 2025 |
| MTF Rides Ltd | Wholesale & retail | 2025 |
| MTL Afghan Construction Ltd | Construction | 2024 |
| MTL Development Ltd | Construction | 2021 |
| Mtw-Uk Ltd | Construction | 2018 |
| Muhammad Abdullah Attari Butt Ltd | Wholesale & retail | 2025 |
| Mujahid Autos Ltd | Wholesale & retail | 2025 |
| Mujco Limited | Wholesale & retail | 2020 |
| Mukhi Sisters Limited | Manufacturing | 2020 |
| Mulgrave Road Flats Holding Limited | Real estate | 2015 |
| Mullens Construction Ltd | Construction | 2014 |
| Multi Products Ltd | Wholesale & retail | 2018 |
| Multi Purpose Services Ltd | Transport & logistics | 2003 |
| Multibiz Limited | Wholesale & retail | 2025 |
| Munir Ltd | Real estate | 2025 |
| Munstead Holdings Ltd | Real estate | 2025 |
| Muntenia RO Ltd | Wholesale & retail | 2019 |
| Munty Motors Ltd | Professional & scientific | 2026 |
| Muradi Investments Ltd | Real estate | 2024 |
| Murano Assets Limited | Real estate | 2023 |
| Murano Estates Limited | Real estate | 2019 |
| Mureli Prop Group Ltd | Real estate | 2025 |
| Muris Developments Limited | Construction | 2015 |
| Musa & Sons Estates Limited | Real estate | 2025 |
| Musa Halal Limited | Wholesale & retail | 2021 |
| Musical Images Limited | Wholesale & retail | 1984 |
| Muslim Engineers' Network Limited | Health & social care | 2022 |
| Mustafa Exchange Limited | Financial services | 2024 |
| Mutley Delivery Services Limited | Transport & logistics | 2026 |
| Muzline Ltd | Wholesale & retail | 2026 |
| MVK Group Holdings Ltd | Administrative & support | 2013 |
| Mvpa Consulting Ltd | Professional & scientific | 2019 |
| MW Merl Engineering Consultants Limited | Professional & scientific | 2015 |
| MXD Holdings Limited | Professional & scientific | 2020 |