| Mryd Ltd | Professional & scientific | 2024 |
| MS (Distribution) UK Ltd | Information & communication | 2002 |
| MSG 1881 Limited | Administrative & support | 2016 |
| MSG Academy Limited | Other services | 2010 |
| MSG Coffee Houses Limited | Extraterritorial | 2012 |
| MSG Coffee Limited | Extraterritorial | 2022 |
| MSG Commercial Limited | Hospitality | 1993 |
| MSG Cornwall Holdco Limited | Financial services | 2022 |
| MSG Cornwall Ltd | Hospitality | 2008 |
| MSG Corporate Services Limited | Professional & scientific | 2012 |
| MSG Executive Services Limited | Extraterritorial | 2016 |
| MSG Food Service Limited | Hospitality | 2011 |
| MSG Group Developments Limited | Extraterritorial | 2016 |
| MSG Group Limited | Extraterritorial | 2018 |
| MSG Holdco Limited | Financial services | 2017 |
| MSG Holdings Limited | Extraterritorial | 2016 |
| MSG House Barnes Limited | Extraterritorial | 2024 |
| MSG House Gloucester Road Limited | Other services | 2023 |
| MSG House Limited | Administrative & support | 2024 |
| MSG Ireland Limited | Extraterritorial | 2016 |
| MSG Islay Limited | Extraterritorial | 2017 |
| MSG Life Cosham Limited | Extraterritorial | 2016 |
| MSG Life Kernow Limited | Extraterritorial | 2016 |
| MSG Life Limited | Arts & recreation | 2015 |
| MSG Life Realty Limited | Real estate | 2015 |
| MSG Nominees Limited | Extraterritorial | 2010 |
| MSG Property Holdco Limited | Extraterritorial | 2016 |
| MSG Sandhurst Limited | Hospitality | 1994 |
| MSG UK Investments Limited | Financial services | 2017 |
| MSJ Telecom Services Limited | Wholesale & retail | 2018 |
| MSR Building Services Limited | Construction | 2003 |
| MSV Narrowboats Ltd | Arts & recreation | 2016 |
| MSY Investment Holdings Ltd | Real estate | 2024 |
| MT1A Limited | Extraterritorial | 2004 |
| Muddy Feet Training Ltd | Education | 2022 |
| Muffin&Brew Limited | Hospitality | 2025 |
| Mulberry Corner Ltd | Administrative & support | 2013 |
| Mulberry Place Management (Banbury) Limited | Real estate | 1996 |
| Munondida Ltd | Health & social care | 2023 |
| Munstead View Limited | Extraterritorial | 2024 |
| Muskybev Ltd | Hospitality | 2025 |
| Mutual Circle Limited | Information & communication | 2010 |
| Muzco Ltd | Wholesale & retail | 2025 |
| Muzhah Properties Limited | Real estate | 2025 |
| MVV 80 Ltd | Construction | 2022 |
| MW PLG & HTG Ltd | Construction | 2014 |
| MW Quick Service Ltd | Wholesale & retail | 2025 |
| Mwamuka Ltd | Health & social care | 2022 |
| MWB Engineering Limited | Manufacturing | 2015 |
| MWD Property Limited | Real estate | 2015 |
| MWP Associates Limited | Professional & scientific | 2023 |
| MX Specialised Services Limited | Water & waste | 2009 |
| My Little CUB Ltd | Wholesale & retail | 2026 |
| My Local Car.Uk Ltd | Transport & logistics | 2022 |
| My Turned on Life Ltd | Education | 2025 |
| Myeyesite Limited | Information & communication | 2021 |
| Myha Conveyancing Limited | Professional & scientific | 2025 |
| Myhoneyskincare Ltd | Wholesale & retail | 2025 |
| Myhz Properties Limited | Real estate | 2025 |
| Mykey Construction Limited | Real estate | 2003 |
| Mynorcatec Limited | Professional & scientific | 2018 |
| Myns Ltd | Real estate | 2025 |
| Myrah and More Ltd | Real estate | 2025 |
| MZ Building Ltd | Construction | 2017 |
| MZ Fire Limited | Construction | 2021 |
| N a Ranya Limited | Other services | 2025 |
| N M Agriculture Limited | Agriculture & fishing | 2019 |
| N&Z Domestic and Commercial Cleaning Ltd | Administrative & support | 2025 |
| N-Dimensional Limited | Information & communication | 2023 |
| N.I.E.22 Limited | Information & communication | 2026 |
| NAD Innovation Ltd | Professional & scientific | 2015 |
| Nagazi Investments Ltd | Construction | 2024 |
| Namba Limited | Professional & scientific | 2012 |
| Nanette Feree Limited | Wholesale & retail | 2014 |
| Napatree Limited | Professional & scientific | 2010 |
| Napoleon Wallace Limited | Wholesale & retail | 2023 |
| Natcha Thai Therapy Ltd | Other services | 2024 |
| Native Rascals Ltd | Information & communication | 2022 |
| Natural Health Store Limited | Hospitality | 2011 |
| Naturally Cleaning Ltd | Administrative & support | 2022 |
| Navy Star Limited | Other services | 2021 |
| Nawab Enterprises Ltd | Real estate | 2021 |
| Naxe Limited | Transport & logistics | 2021 |
| Nazareth Solutions Limited | Public administration | 2025 |
| NDM Design & Landscape Ltd | Wholesale & retail | 2022 |
| NDP Housing Developments Limited | Construction | 2024 |
| NDR Arable LLP | | 2008 |
| Need More Music Ltd | Arts & recreation | 2025 |
| Negocia UK Limited | Wholesale & retail | 2024 |
| Negru Voda Ltd | Transport & logistics | 2025 |
| Neil Ellis Agility Ltd | Other services | 2022 |
| Neil Haynes Ltd | Manufacturing | 2014 |
| Nellbridge Country Sports Limited | Agriculture & fishing | 2009 |
| Nellbridge Garage Ltd | Wholesale & retail | 2025 |
| Nelson Bodfish Holdings Ltd | Real estate | 2026 |
| Nerd Monkey Ltd | Wholesale & retail | 2023 |
| NES Security Services Limited | Administrative & support | 2014 |
| Nested Cube Limited | Information & communication | 2009 |
| NET Zero Energy Solutions Ltd | Manufacturing | 2023 |
| Nethertech Engineering Ltd | Other services | 2018 |