| Mxzam Limited | Health & social care | 2024 |
| My Bespoke Order Limited | Wholesale & retail | 2023 |
| My BRA Rocks Limited | Manufacturing | 2021 |
| My First Place Limited | Health & social care | 2021 |
| My Home DRY Limited | Construction | 2024 |
| My Mortgage Advisor MMA Ltd | Financial services | 2022 |
| My Priya Ltd | Hospitality | 2026 |
| My Store 1 Limited | Hospitality | 2016 |
| Mya's Gifts Limited | Manufacturing | 2019 |
| Myadam Limited | Real estate | 2018 |
| Mybb Ltd | Administrative & support | 2004 |
| Mycloset Retail Limited | Professional & scientific | 2021 |
| Myers Construction Limited | Construction | 1995 |
| Myndcode Limited | Professional & scientific | 2010 |
| MYSHOP6 Ltd | Hospitality | 2017 |
| Mysportsfix Ltd | Information & communication | 2026 |
| Mythos Kitchen Moseley Ltd | Hospitality | 2025 |
| Mywraps Limited | Wholesale & retail | 2018 |
| MZ1 Construction Services Limited | Construction | 2023 |
| MZH Distribution Ltd | Wholesale & retail | 2025 |
| N & J Property Developments Limited | Other services | 2012 |
| N & S Assets Ltd | Real estate | 2018 |
| N a Medd Ltd | Extraterritorial | 2009 |
| N Legal Limited | Professional & scientific | 2006 |
| N N R Elite Tiling Ltd | Construction | 2023 |
| N&A Trading Ltd | Construction | 2024 |
| N&D First AID Ltd | Health & social care | 2022 |
| N&P Ventures Limited | Real estate | 2019 |
| N&Y Property Limited | Real estate | 2024 |
| N.E.B. Ltd | Transport & logistics | 2023 |
| Naanbake Limited | Hospitality | 2025 |
| Nabi Namu Co Ltd | Real estate | 2018 |
| Nadhi Properties Limited | Real estate | 2024 |
| Nail LAB 1 Ltd | Other services | 2025 |
| Naitsabes Limited | Transport & logistics | 2024 |
| Naked Chicken JQ Ltd | Hospitality | 2023 |
| NAM Healthcare Services Limited | Health & social care | 2015 |
| Nanko Medical Solutions Ltd | Health & social care | 2025 |
| Napier Private Wealth Limited | Financial services | 2022 |
| Nasib Kaur Enterprises Ltd | Real estate | 2019 |
| Nat-Com Services Limited | Professional & scientific | 2014 |
| Nation Family Holdings Limited | Financial services | 2021 |
| Nation Wilcox Limited | Administrative & support | 2003 |
| Nation Wilcox Systems Limited | Information & communication | 1979 |
| National Car Sales Ltd | Wholesale & retail | 2021 |
| National Funeral Trust Limited | Extraterritorial | 1984 |
| National Women in Roofing UK Limited | Administrative & support | 2026 |
| Nationwide Forecourt & Building Maintenance Limited | Administrative & support | 2019 |
| Nationwide Wills and Legal Services Limited | Professional & scientific | 2020 |
| Naturallysheepskins Limited | Wholesale & retail | 2020 |
| NAU Nihaal Holdings Limited | Professional & scientific | 2021 |
| Nauk Ltd | Professional & scientific | 2016 |
| Navelton Ltd | Real estate | 2022 |
| Navigating the Wilderness CIC | Professional & scientific | 2024 |
| Navigation HR Consultancy Ltd | Administrative & support | 2016 |
| NB Continuing Health Care Specialist Services Ltd | Administrative & support | 2019 |
| NB Invest 1 Ltd | Real estate | 2025 |
| NB Invest 2 Ltd | Real estate | 2025 |
| NB Trade Ltd | Real estate | 2025 |
| NBP Optics Ltd | Health & social care | 2023 |
| NBX Holding Limited | Financial services | 2025 |
| NCA SI Ltd | Professional & scientific | 2025 |
| NCS Property Consultants Limited | Professional & scientific | 2014 |
| Ncspcl Holdings Limited | Financial services | 2015 |
| NDC Polipak Limited | Manufacturing | 1999 |
| Nddc Limited | Health & social care | 2026 |
| NDM Publishing Limited | Information & communication | 2017 |
| Neale & Co Limited | Professional & scientific | 2006 |
| Neatline Construction Limited | Construction | 2017 |
| Nebulem Manufacturing Limited | Manufacturing | 2013 |
| NEC Beauty and Aesthetics Ltd | Other services | 2019 |
| Nectar Financial Solutions Ltd | Administrative & support | 2017 |
| Need Enterprises Limited | Other services | 1978 |
| Needle Properties Ltd | Real estate | 2024 |
| Needles EYE Limited | Professional & scientific | 2008 |
| Neev Holdings Limited | Financial services | 2026 |
| Neil Rogers Healthcare Management Solutions Limited | Information & communication | 2014 |
| Neils Housing Limited | Real estate | 2025 |
| Nekoda Marketing Group Limited | Professional & scientific | 2018 |
| Nelson Design Studio Limited | Wholesale & retail | 2020 |
| Neon Two Ltd | Professional & scientific | 2024 |
| Neptune Design Centre Bournemouth Limited | Wholesale & retail | 2014 |
| Neptune Design Centre Winchester Limited | Wholesale & retail | 2011 |
| Neptune Sups Limited | Wholesale & retail | 2026 |
| Nestohive Property Ltd | Real estate | 2025 |
| Nestor Property Ltd | Real estate | 2020 |
| Nestor Sage Limited | Professional & scientific | 2020 |
| Nestpoint Homes Ltd | Real estate | 2026 |
| NET Zero Dental Limited | Health & social care | 2021 |
| Netfocus Technologies Limited | Information & communication | 2022 |
| Network Flooring Ltd | Other services | 2020 |
| Network Setup Ltd | Information & communication | 2023 |
| Networkcom Limited | Information & communication | 2008 |
| NEURO8 Ltd | Education | 2015 |
| Neuroinclusive Workplace Services Ltd | Health & social care | 2026 |
| Neurology Care Ltd | Health & social care | 2022 |
| Neurology Expert Ltd | Health & social care | 2022 |
| Neuroshift Limited | Manufacturing | 2023 |
| Neuwy Ltd | Wholesale & retail | 2026 |
| New Conservatory Roofs Limited | Administrative & support | 2015 |