| Munro Property Development and Rentals Limited | Real estate | 2023 |
| MW Farm Trading Ltd | Agriculture & fishing | 2018 |
| MW Ground Construction Limited | Construction | 2026 |
| MW Interior Solutions Ltd | Construction | 2019 |
| My Dog Meadow Limited | Arts & recreation | 2021 |
| Myersons (CA) Limited | Professional & scientific | 2012 |
| MYO Developments Limited | Professional & scientific | 2008 |
| MYX Consulting Limited | Information & communication | 2021 |
| N D Mattack Limited | Health & social care | 2005 |
| N.O.A. Property Services Ltd. | Hospitality | 2004 |
| Naecowave Ltd | Information & communication | 2022 |
| NAO Consulting Limited | Wholesale & retail | 2025 |
| NAR Projects Ltd | Professional & scientific | 2016 |
| Nation Limited | Other services | 2019 |
| National NVQ Assessments Limited | Education | 2022 |
| Nationwide Leisure Group Limited | Other services | 2024 |
| Nautical Hydrogen Ltd | Professional & scientific | 2024 |
| NB HR Consultancy Ltd | Professional & scientific | 2022 |
| NB Online Ltd | Wholesale & retail | 2022 |
| NE Cleaning Solutions UK Ltd | Administrative & support | 2026 |
| Neighbourhood Ormskirk Ltd | Other services | 2021 |
| Neil Joseph Hair and Beauty Ltd | Other services | 2012 |
| Neil Wright Solid Wood Flooring Limited | Administrative & support | 2013 |
| Nelsoft Ltd | Information & communication | 2025 |
| Nelson Property Group Limited | Households | 2017 |
| Nelsons Nurseries Limited | Wholesale & retail | 2009 |
| NEO + TOT Ltd | Health & social care | 2022 |
| Net-Click Ltd | Wholesale & retail | 2015 |
| Netret Group Ltd | Professional & scientific | 2022 |
| Network Tree Services Limited | Agriculture & fishing | 2020 |
| New ERA Mastics Limited | Construction | 2023 |
| New Leaf Topiary Ltd | Wholesale & retail | 2006 |
| Newbold Developments Ltd | Real estate | 2022 |
| Newviews Ltd | Professional & scientific | 2007 |
| Nexa Transport Services Ltd | Transport & logistics | 2025 |
| Next GEN Renewables Ltd | Manufacturing | 2015 |
| NEXT2NEWGOLF International Limited | Administrative & support | 2024 |
| NEXT2NEWGOLF Limited | Wholesale & retail | 2021 |
| Nexus Nuclear Solutions Ltd | Professional & scientific | 2026 |
| NFJ Services Ltd | Information & communication | 2026 |
| NHE Media Makeup Ltd | Other services | 2022 |
| Nice a Travel Ltd | Transport & logistics | 2024 |
| Nigel GUY Holdings Limited | Financial services | 2019 |
| Nigill Ltd | Real estate | 2020 |
| Nishita Medical Ltd | Health & social care | 2024 |
| Nixon Upholstery Ltd | Wholesale & retail | 2025 |
| NJM Cable Jointing Services Ltd | Construction | 2011 |
| NJR Project Services Ltd | Professional & scientific | 2012 |
| NKW Contractors Ltd | Construction | 2018 |
| NO BRA Clique Limited | Wholesale & retail | 2021 |
| NO Ordinary JOE Limited | Information & communication | 2025 |
| Nordic Signs BSL Ltd | Professional & scientific | 2019 |
| Norphix Ltd | Information & communication | 2026 |
| North West Foods Limited | Extraterritorial | 2008 |
| North West Holiday Homes Limited | Wholesale & retail | 2016 |
| North West Holiday Parks Limited | Hospitality | 2017 |
| North West Property Lawyers Ltd | Professional & scientific | 2020 |
| Northburn Oils Holdings Limited | Financial services | 2016 |
| Northburn Oils Ltd | Water & waste | 2016 |
| Northern Freight Services Limited | Other services | 1980 |
| Northern Lights Developments Limited | Construction | 2021 |
| Northern Print Management EOT Limited | Administrative & support | 2023 |
| Northland Holdings Ltd | Real estate | 2026 |
| Northmoor Portfolio Services Limited | Financial services | 2019 |
| Northstar Ridge Ltd | Wholesale & retail | 2026 |
| Northway Caravan Park Limited | Hospitality | 1978 |
| Noustai Limited | Information & communication | 2025 |
| NOW Future Solutions Limited | Wholesale & retail | 2025 |
| NPK Business Services Limited | Administrative & support | 2008 |
| NPK Groundwork Contractors Limited | Construction | 2010 |
| NRB Consulting Ltd | Professional & scientific | 2025 |
| NRE Surveyors Ltd | Real estate | 2011 |
| Nrich IT Management Consulting Ltd | Information & communication | 2025 |
| NSG Holding (Europe) Limited | Professional & scientific | 2001 |
| NSW Commercial Ltd | Professional & scientific | 2013 |
| NSW Estate Agents Limited | Real estate | 2013 |
| NSW Properties Limited | Real estate | 2004 |
| NSW Property Lettings Limited | Real estate | 2011 |
| NTB Lettings Ltd | Real estate | 2024 |
| NU Look Hair Ltd | Other services | 2025 |
| NV Brand Ltd | Other services | 2024 |
| NW Vehicle Rentals Ltd | Transport & logistics | 2025 |
| NWI Ltd | Construction | 2016 |
| NWI Reactive Ltd | Construction | 2025 |
| NXG Fitness Ltd | Arts & recreation | 2025 |
| NXT GEN Property Investments Limited | Real estate | 2021 |
| Oak Dental Care Ltd | Health & social care | 2006 |
| Oak Properties (Maghull) Limited | Real estate | 2003 |
| Oak Wines Limited | Wholesale & retail | 2017 |
| Oasis Island Investments Limited | Financial services | 2024 |
| Obats Retail Ltd | Wholesale & retail | 2025 |
| October Days Limited | Professional & scientific | 2019 |
| ODA Property Management Ltd | Real estate | 2024 |
| ODC Holdings Limited | Health & social care | 2017 |
| ODM Energy Certification Limited | Professional & scientific | 2008 |
| OEC Consultancy Ltd | Health & social care | 2023 |
| OEC Skin and Aesthetics Ltd | Other services | 2026 |
| Offas Dyke Hotel Ltd | Hospitality | 2026 |
| Offshore Innovation Limited | Professional & scientific | 2020 |
| OH Solutions Limited | Health & social care | 2001 |