| My Violet Hill Limited | Wholesale & retail | 2012 |
| Mycareo Ltd | Wholesale & retail | 2016 |
| Myge Investment Group Ltd | Financial services | 2018 |
| Mylas Moss Ltd | Manufacturing | 2020 |
| Myriad Media Ltd | Professional & scientific | 2016 |
| Myrtle Road 40 Management Limited | Real estate | 2015 |
| MZA Foods Limited | Administrative & support | 2022 |
| N Brown Consultancy Ltd | Professional & scientific | 2023 |
| N C Scaffolding and Rigging Ltd. | Construction | 2013 |
| N M Hamilton Ltd | Administrative & support | 2009 |
| N S Builders 4 U Ltd | Construction | 2016 |
| N T a Monitor Limited | Information & communication | 1996 |
| N Warren Ltd | Hospitality | 2016 |
| N&G Plastering Ltd | Construction | 2018 |
| N&J Golding Ltd | Professional & scientific | 2019 |
| N&P Dent Construction Limited | Construction | 2026 |
| N&P Dent Developments Ltd | Construction | 2025 |
| N&P Scaffolding Ltd | Construction | 2022 |
| N. a. B. Flooring Limited | Construction | 2015 |
| N.E.D. Resources Ltd | Professional & scientific | 2014 |
| N.V. Tools Estates Limited | Construction | 1972 |
| N1 Signs Limited | Manufacturing | 2008 |
| N12 Developments Ltd | Construction | 2016 |
| N9NE Clothing Ltd | Wholesale & retail | 2022 |
| NAC Fire Safety Ltd | Education | 2023 |
| Nacasa Facilities Services Limited | Manufacturing | 2023 |
| Nadia Halley Ltd | Health & social care | 2021 |
| Nadland Limited | Construction | 1977 |
| Nag's Mews Ltd | Real estate | 2024 |
| Nagyte and Co. Ltd | Professional & scientific | 2025 |
| Naijapepper Ltd | Wholesale & retail | 2026 |
| Nails Plus Grand Ltd | Other services | 2026 |
| Najim Ltd | Real estate | 2009 |
| Nakita Resources Limited | Wholesale & retail | 2023 |
| Nandhra Holdings Limited | Financial services | 2026 |
| Nashville Properties Ltd | Real estate | 2021 |
| Nationwide Book Collections Ltd | Water & waste | 2020 |
| Nationwide Contract Services Limited | Construction | 2018 |
| Nautica Foods Ltd | Hospitality | 2025 |
| Nautica Investments Ltd | Hospitality | 2024 |
| Nautica Retail Ltd | Construction | 2024 |
| Nautica Solutions Ltd | Information & communication | 2015 |
| Navy's Investments Ltd | Administrative & support | 2025 |
| Naxa Ltd | Professional & scientific | 2021 |
| Nayr Limited | Professional & scientific | 2022 |
| NBA Construction Ltd | Construction | 2024 |
| NBN Group Ltd | Information & communication | 2019 |
| NDT Services Limited | Professional & scientific | 1986 |
| Necalex Ltd | Public administration | 2026 |
| Neel Consulting Limited | Information & communication | 2016 |
| Neelex Ltd | Financial services | 2026 |
| Neil Rowe Property Limited | Real estate | 2020 |
| Neither AM I Media Consulting Ltd | Professional & scientific | 2026 |
| Nelly Mcnally Limited | Other services | 2017 |
| Nelo Holdings Limited | Real estate | 2020 |
| Nemo Associates International Limited | Professional & scientific | 2011 |
| Nemo Ventures Limited | Hospitality | 2020 |
| NEO Laboratories Limited | Manufacturing | 1957 |
| Neobards Limited | Professional & scientific | 2014 |
| Neos Genesis Ltd | Wholesale & retail | 2023 |
| Ners Ltd | Construction | 2017 |
| Nervi Digitales Ltd | Information & communication | 2023 |
| Nesw Home Guardian Ltd | Construction | 2024 |
| Networking 2000 Limited | Information & communication | 2006 |
| Neuragenix Ltd | Financial services | 2024 |
| Neuragenix Pharma Limited | Manufacturing | 2026 |
| Neurobetter | Health & social care | 2024 |
| Neuromonkey Ltd | Manufacturing | 2022 |
| Nevezedek Limited | Professional & scientific | 2015 |
| Nevill Coghill Limited | Arts & recreation | 1968 |
| Neville Bruton Design Limited | Professional & scientific | 2003 |
| New & Used (Southchurch) Ltd | Wholesale & retail | 2021 |
| New Avenue (Cockfosters) Management Company Limited | Households | 2019 |
| New Century Estates (Holdings) Ltd. | Financial services | 2019 |
| New Happy House Sussex Limited | Hospitality | 2021 |
| New Horizon Management Company Limited | Real estate | 2003 |
| New JAR Aviation Limited | Professional & scientific | 2024 |
| New Level Homes Ltd | Real estate | 2017 |
| New London Aesthetics Ltd | Other services | 2016 |
| New Taste of China Limited | Hospitality | 2023 |
| New Way Tuition Limited | Education | 2021 |
| Newbolt Ltd | Professional & scientific | 2023 |
| Newbould & Co Solutions Limited | Information & communication | 2017 |
| Newbourne Parks Limited | Hospitality | 2018 |
| Newburgh Survey & Design Limited | Administrative & support | 2017 |
| Newgate Electrical Services Ltd | Professional & scientific | 2021 |
| Newhouse Limited | Professional & scientific | 2018 |
| Newkel Limited | Administrative & support | 1998 |
| Newmurph Homes Ltd | Real estate | 2020 |
| Newt Computing Limited | Information & communication | 1995 |
| Nexleads Ltd | Information & communication | 2025 |
| Next Chapter Homes Ltd. | Real estate | 2013 |
| Next Generation INS Group Ltd | Financial services | 2018 |
| Next World Limited | Wholesale & retail | 2018 |
| Nexta Ltd | Information & communication | 2022 |
| Nextabode.Co.Uk Estate Agents Limited | Real estate | 2024 |
| Nexus UK Holdings Limited | Financial services | 2023 |
| NEXUS888 Ltd | Professional & scientific | 2018 |
| NF Forensics Limited | Professional & scientific | 2022 |
| NFC Logistics Ltd | Transport & logistics | 2023 |