| Moustache Barber Ltd | Other services | 2024 |
| Move ALL Ltd | Transport & logistics | 2021 |
| Move in Lettings Ltd | Real estate | 2018 |
| Move Mojo London C.I.C. | Health & social care | 2021 |
| Move Transport and Logistics Ltd. | Transport & logistics | 2014 |
| Moving Specialists Limited | Transport & logistics | 2024 |
| Moxd Services Limited | Professional & scientific | 2025 |
| Moxom Construction Limited | Construction | 2005 |
| Mozi Builders Limited | Construction | 2010 |
| MPC M&E Services Limited | Energy | 2016 |
| MPE Electrical Contractors Ltd | Construction | 2014 |
| MPE Group M&E Ltd | Construction | 2024 |
| Mphp Trading Ltd | Wholesale & retail | 2026 |
| Mprm Limited | Construction | 2014 |
| MR & MRS Builders Ltd | Construction | 2023 |
| MR Campervan Ltd | Wholesale & retail | 2020 |
| MR Chippy Bistro Limited | Hospitality | 2018 |
| MR Living Limited | Real estate | 2017 |
| MR LNR Homes Ltd | Real estate | 2022 |
| Mr.G Engineering Limited | Professional & scientific | 2026 |
| Mrbarra Ltd | Health & social care | 2020 |
| MRH Property Ltd | Real estate | 2016 |
| MRJ Advisors Limited | Professional & scientific | 2018 |
| MRT Solutions Ltd | Wholesale & retail | 2023 |
| Mrvl Technologies Ltd | Information & communication | 2026 |
| Mrwt Limited | Administrative & support | 2014 |
| MS Refrigeration and Building Services Limited | Construction | 2024 |
| Msaf Holdings Limited | Real estate | 2018 |
| MSK Global Properties Ltd | Real estate | 2024 |
| MSN Assets Ltd | Real estate | 2024 |
| MSP Box Ltd | Information & communication | 2019 |
| MSP Creative Ltd | Professional & scientific | 2019 |
| MSR Residential Group Ltd | Real estate | 2026 |
| Msrn Ltd | Real estate | 2023 |
| Mssl Hire Ltd | Construction | 2019 |
| MSV Trading Ltd | Wholesale & retail | 2023 |
| MT Graphics Ltd | Professional & scientific | 2026 |
| MT Joinery & Shopfitting Ltd | Construction | 2018 |
| MT Roofing and Building Services Ltd | Construction | 2020 |
| MTK Cctv Installations Ltd | Administrative & support | 2025 |
| MTM Engineering Services Limited | Professional & scientific | 2003 |
| MTS Products Limited | Wholesale & retail | 2018 |
| Mtsi Ltd | Wholesale & retail | 2014 |
| Mtsi Sports Limited | Arts & recreation | 2017 |
| MTT Telecoms Ltd | Information & communication | 2026 |
| Mucelli Ltd | Transport & logistics | 2026 |
| Mulfords Limited | Construction | 2017 |
| Multicad Solutions Limited | Extraterritorial | 2013 |
| Multipoint Locksmiths Limited | Professional & scientific | 2025 |
| Multiroute Ltd | Information & communication | 2018 |
| Muluci Trans Ltd | Transport & logistics | 2024 |
| MUM Properties Ltd | Real estate | 2025 |
| Mummy's Linkup CIC | Health & social care | 2025 |
| Munyaverse Ltd | Administrative & support | 2022 |
| Murphy Recruitment Consultants Ltd | Administrative & support | 2025 |
| MUS Chips Ltd | Hospitality | 2026 |
| Musango Ltd | Manufacturing | 2026 |
| Music Mixing Ltd | Information & communication | 2025 |
| Musical Wisdom Limited | Education | 2013 |
| Muslim Communities Development Trust Ltd | Professional & scientific | 2019 |
| Muslim International Film Festival Ltd | Arts & recreation | 2018 |
| Mussati Construction & Building Limited | Construction | 2023 |
| Mustico Ltd | Real estate | 2020 |
| Muttha Properties Ltd | Real estate | 2025 |
| Muve Media & Marketing Ltd | Professional & scientific | 2018 |
| Muzvuru Transport Ltd | Transport & logistics | 2018 |
| MV Adventure Ltd | Administrative & support | 2024 |
| MV Barbers Ltd | Other services | 2025 |
| MV Exports Ltd | Wholesale & retail | 2015 |
| MV Properties (Essex) Ltd | Real estate | 2018 |
| Mwms Enterprise Ltd | Hospitality | 2020 |
| Mwms One Limited | Real estate | 2024 |
| Mwms Two Limited | Households | 2025 |
| MWS Engineering Services Ltd | Construction | 2019 |
| My Cultural Experience Limited | Education | 2022 |
| My Elite Planet Limited | Wholesale & retail | 2022 |
| My Furniture Hire Ltd | Administrative & support | 2023 |
| My Group Solutions Limited | Administrative & support | 2001 |
| My Home Furniture Limited | Wholesale & retail | 2020 |
| My Kitchen Your Place Limited | Hospitality | 2014 |
| My Own Tutor (Bluewater) Ltd | Education | 2019 |
| My Secure Mind Limited | Education | 2025 |
| MY9 Technologies Ltd | Information & communication | 2018 |
| Myablesupport Network CIC | Education | 2024 |
| Myco Biotech Ltd | Manufacturing | 2021 |
| Myhallen Investments Ltd | Real estate | 2024 |
| Myhallen Services Ltd | Construction | 2025 |
| Myron Homes Group Ltd | Construction | 2025 |
| Mysite Services Ltd | Other services | 2019 |
| Myskin Shop UK Ltd | Wholesale & retail | 2022 |
| Mystima Ltd | Administrative & support | 2025 |
| MZ Property Limited | Construction | 2016 |
| N Domi Construction Ltd | Construction | 2014 |
| N Golding (Kent) Property Services Limited | Real estate | 2001 |
| N Golding Investments Ltd | Financial services | 2019 |
| N J Elevators Ltd | Manufacturing | 2023 |
| N P Super Limited | Wholesale & retail | 2023 |
| N Y E Ltd. | Construction | 1998 |
| N&P Alternative Fuels Ltd | Water & waste | 2010 |
| N&P Crayford Holding Ltd | Financial services | 2021 |