| Molly Bather Limited | Manufacturing | 2004 |
| Molly Maintenance Ltd | Construction | 2022 |
| Mollykoe Ltd | Professional & scientific | 2023 |
| Montridge Properties Ltd | Real estate | 2022 |
| Moore Connections Limited | Professional & scientific | 2013 |
| Morgan Tovey Limited | Professional & scientific | 2020 |
| Morris Analytics Limited | Information & communication | 2020 |
| Mortgage Saving Expert (2023) Ltd | Financial services | 2023 |
| Mortimer Health Care Limited | Health & social care | 2012 |
| Mother HEN Catering Ltd | Hospitality | 2016 |
| Motion Social Ltd | Professional & scientific | 2019 |
| Motorsport Consulting UK Ltd | Professional & scientific | 2022 |
| Mount Bugle Developments Limited | Construction | 2023 |
| Move Pilates Ltd | Arts & recreation | 2024 |
| Movevolution Ltd | Arts & recreation | 2019 |
| Movingcars.Sm Ltd | Transport & logistics | 2024 |
| Movoda Telecom Limited | Information & communication | 2014 |
| MP Solve Ltd | Professional & scientific | 2018 |
| MPP Consultancy Limited | Professional & scientific | 2022 |
| MR Helpful Ltd | Extraterritorial | 2019 |
| MRL Housing & Transformation Ltd | Professional & scientific | 2023 |
| MRS G Accounting Services Ltd | Professional & scientific | 2016 |
| MSA Environmental Limited | Professional & scientific | 1994 |
| MSK Catering and Events Ltd | Hospitality | 2023 |
| MSO Holdings Ltd | Real estate | 2024 |
| MT Chase Ltd | Financial services | 2019 |
| Multi Mite Ltd | Agriculture & fishing | 2017 |
| Munro Audit Limited | Professional & scientific | 2010 |
| Munway Enterprises Ltd | Education | 2023 |
| Musa Crafted Charms Ltd | Wholesale & retail | 2025 |
| Mutandum Ltd | Professional & scientific | 2026 |
| My Greek FAT Wraps Ltd | Hospitality | 2018 |
| My Little Angels Care Company Ltd. | Health & social care | 2016 |
| My Little Angels Holdings Ltd | Financial services | 2019 |
| My Sales Director Ltd | Other services | 2025 |
| My Skills Partner Ltd | Administrative & support | 2025 |
| Myall Product Development Ltd | Manufacturing | 2026 |
| Mymachine Ltd | Wholesale & retail | 2019 |
| Mysticfish Limited | Professional & scientific | 2016 |
| N C Utilities Limited | Construction | 2009 |
| N D H Installations Ltd | Construction | 2002 |
| N G O'Leary Environmental Ltd | Water & waste | 2022 |
| N L Motor Services Limited | Wholesale & retail | 2018 |
| N Little Limited | Construction | 2016 |
| Naaga Ltd | Hospitality | 2023 |
| Nacho Cheese Franchising Limited | Hospitality | 2021 |
| Nacho Cheese Limited | Extraterritorial | 2022 |
| Nacho Cheese Marketing Limited | Professional & scientific | 2021 |
| Nacho Cheese Trowbridge Limited | Hospitality | 2022 |
| Nacsis Ltd | Wholesale & retail | 2025 |
| Nagg Limited | Real estate | 2012 |
| Nathan Furniture Ltd | Manufacturing | 2020 |
| Nature's Sanctuary Ltd | Wholesale & retail | 2022 |
| Naval Architecture Services Ltd | Manufacturing | 2022 |
| Nboydell Properties Ltd | Real estate | 2024 |
| Nefira Ltd | Real estate | 2026 |
| Neil Southwell Ltd | Administrative & support | 2017 |
| Neptune Asset Co Ltd | Financial services | 2023 |
| Net-Eco Ltd | Construction | 2021 |
| New Broughton Management Limited | Real estate | 2000 |
| New Gutter Ltd | Administrative & support | 2024 |
| New Peking House Ltd | Administrative & support | 2018 |
| New Polish Deli Ltd | Wholesale & retail | 2008 |
| Newholdco Ltd | Financial services | 2022 |
| Newland Moore Ltd | Extraterritorial | 2018 |
| Newtown Garden Limited | Hospitality | 2024 |
| NFT Care Ltd | Administrative & support | 2025 |
| NFT Distribution Ltd | Transport & logistics | 2023 |
| NGM Care Ltd | Health & social care | 2014 |
| NGM Motors Ltd | Wholesale & retail | 2021 |
| NGM Solutions Ltd | Professional & scientific | 2019 |
| NH Sandhu Trasnport Ltd | Transport & logistics | 2024 |
| Niall & Co Construction Limited | Construction | 2021 |
| Nick Dyer Construction Limited | Construction | 2012 |
| Nige the GAS MAN Limited | Construction | 2016 |
| Nikav Cleaning Solutions Ltd | Administrative & support | 2026 |
| Noble House 188 Ltd | Hospitality | 2021 |
| Nordeer Ltd | Wholesale & retail | 2025 |
| Norris Auto Sales Limited | Wholesale & retail | 2022 |
| Norris Auto Services Limited | Wholesale & retail | 2017 |
| Nortree Limited | Wholesale & retail | 2012 |
| Nortree Motor Company Limited | Wholesale & retail | 2007 |
| Notebook Assessment Services Ltd | Education | 2019 |
| Notton Park Management Limited | Households | 2007 |
| Nova Electrics Wiltshire Limited | Construction | 2026 |
| Nova Preservation Ltd | Construction | 2015 |
| Novapath Advisory Ltd | Information & communication | 2026 |
| Novo Resourcing Ltd | Professional & scientific | 2012 |
| NST Seafoods Ltd | Wholesale & retail | 2023 |
| Nu-Concept Electrical Ltd | Construction | 2021 |
| Number One Development Ltd | Real estate | 2017 |
| Nurdin Elite Ladies Kickboxing Ltd | Arts & recreation | 2024 |
| Nursteed Electrical Limited | Construction | 2019 |
| Nutricia Limited | Hospitality | 1933 |
| Nutricia Trustees Limited | Professional & scientific | 1996 |
| Nutriplan Ltd | Information & communication | 2025 |
| Nutriskin Wholesale Ltd | Wholesale & retail | 2025 |
| Nyabanda Ltd | Health & social care | 2024 |
| Nydaloxe Precision Limited | Wholesale & retail | 1991 |
| Oak & Hyde Ltd | Wholesale & retail | 2024 |