| MRS MC Properties Ltd | Real estate | 2022 |
| MS Harvey Properties Limited | Hospitality | 2024 |
| Mselevators Ltd | Professional & scientific | 2022 |
| MSI Installations Limited | Construction | 2022 |
| MSP Cars Limited | Wholesale & retail | 2026 |
| MSP Design and Construct Limited | Professional & scientific | 2022 |
| MTH Investments Ltd | Real estate | 2020 |
| Mttnb Limited | Hospitality | 2009 |
| Mudc Ltd | Health & social care | 2024 |
| Mulberry Lifestyle Management Limited | Professional & scientific | 2024 |
| Multi Screens Ltd | Wholesale & retail | 2004 |
| Multidiesels Ltd | Wholesale & retail | 2018 |
| Murchington Consulting Ltd | Administrative & support | 2020 |
| Murcia Consultancy Limited | Professional & scientific | 2022 |
| Murielle Ltd | Wholesale & retail | 2021 |
| Murlon Properties Ltd | Real estate | 2025 |
| Musicline Limited | Information & communication | 2008 |
| Musicline Publications Limited | Information & communication | 1998 |
| MWE Consulting Ltd | Professional & scientific | 2008 |
| MWS Lettings Ltd | Real estate | 2024 |
| MX Watches Limited | Wholesale & retail | 2025 |
| My Art Broker (London) Limited | Wholesale & retail | 2014 |
| Myla Aesthetics Limited | Health & social care | 2017 |
| Myla Medical Ltd | Health & social care | 2022 |
| Myon Construction Limited | Construction | 2015 |
| Mythos Bites Limited | Hospitality | 2025 |
| MZ Photography and Drone Services Ltd | Professional & scientific | 2022 |
| N & W Holdings Ltd | Financial services | 2022 |
| N C R Associates Limited | Professional & scientific | 2012 |
| N C R Holdings Limited | Real estate | 2019 |
| N J Barratt Limited | Hospitality | 2023 |
| N&A Investments (UK) Ltd | Real estate | 2010 |
| N&J Barratt Ltd | Hospitality | 2025 |
| N. R. & H. M. Turner Limited | Construction | 2002 |
| N. Wood Computing Limited | Wholesale & retail | 1998 |
| N.W. Tyres Limited | Water & waste | 2006 |
| Nagni Holdings Ltd | Wholesale & retail | 2026 |
| Naho Systems Ltd | Financial services | 2004 |
| Nanotec Ltd | Wholesale & retail | 2025 |
| Nash Concepts Ltd | Wholesale & retail | 2022 |
| Nasm Services Ltd | Construction | 2011 |
| National Safety Solutions Limited | Other services | 2016 |
| Nationwide Energy Limited | Professional & scientific | 2008 |
| Natural Ventilation Solutions Limited | Extraterritorial | 2005 |
| Nature HQ Ltd | Professional & scientific | 2020 |
| Natures Hope Holdings Ltd | Agriculture & fishing | 2023 |
| Nazareth AV Limited | Administrative & support | 2015 |
| NCC Trans Ltd | Transport & logistics | 2018 |
| ND Contracting Limited | Information & communication | 2025 |
| NDA Laker Properties Ltd | Real estate | 2025 |
| Neat Feet Podiatry Ltd | Health & social care | 2015 |
| Nebula Design Limited | Information & communication | 2019 |
| Needham Hall Limited | Wholesale & retail | 1986 |
| Needwood Living 136 Holding Limited | Professional & scientific | 2020 |
| Needwood Living Limited | Households | 2014 |
| Negotium 360 Solutions Limited | Information & communication | 2014 |
| Neil Boddison Associates Limited | Professional & scientific | 2004 |
| Nemacom Limited | Manufacturing | 1991 |
| Nemea Enterprises (Lichfield) Limited | | 1980 |
| Nemesis Rail Limited | Professional & scientific | 2007 |
| Nemrut Restaurant Ltd | Hospitality | 2018 |
| Neon Blue Ltd | Real estate | 2018 |
| Neon Urchin Limited | Information & communication | 2012 |
| Neonhugs Ltd | Transport & logistics | 2019 |
| Nero Bianco Ltd | Wholesale & retail | 2021 |
| Nero Motori Limited | Manufacturing | 2025 |
| Nero Property Services Limited | Households | 2017 |
| Nestwork UK Investments Ltd | Real estate | 2023 |
| Nestwork UK Land Ltd | Real estate | 2023 |
| Nestwork UK Rental Ltd | Real estate | 2022 |
| Net-Suite Connect Ltd | Information & communication | 2024 |
| Netwise Solutions Limited | Information & communication | 1998 |
| Network Display Solutions Ltd | Administrative & support | 2014 |
| Network Solutions (UK) Limited | Transport & logistics | 2013 |
| Networklocal Limited | Professional & scientific | 2025 |
| Netzsch Mastermix Limited | Manufacturing | 1979 |
| Nevarc Properties Ltd | Real estate | 2020 |
| Nevern Ltd | Construction | 2026 |
| New Disguise Limited | Wholesale & retail | 2009 |
| New Eden Building & Landscapes Limited | Construction | 2024 |
| New Image Flooring Limited | Construction | 2010 |
| New Media House Limited | Real estate | 2018 |
| New Orchards Investment Ltd | Real estate | 2016 |
| New Promise Homes Limited | Health & social care | 2025 |
| New Range Limited | Wholesale & retail | 2018 |
| New Start Poultry Limited | Agriculture & fishing | 2018 |
| New Village Estates Limited | Hospitality | 2009 |
| New Vision Bars Limited | Hospitality | 2021 |
| New Vision Events Limited | Arts & recreation | 2021 |
| New Vision Holdings (Midlands) Ltd | Financial services | 2025 |
| New Vision Properties (Midlands) Ltd | Real estate | 2026 |
| New Wave Heating Limited | Wholesale & retail | 2018 |
| Newave Ltd | Education | 2012 |
| Newell Brands UK Limited | Wholesale & retail | 1909 |
| Newell Holdings Limited | Professional & scientific | 2000 |
| Newell Rubbermaid UK Holdings Limited | Professional & scientific | 2011 |
| Newell Rubbermaid UK Production | Manufacturing | 1924 |
| Newell Rubbermaid UK Services Limited | Administrative & support | 1994 |
| Newfound Care Ltd | Health & social care | 2018 |
| Newhall Fencing Limited | Construction | 2006 |