| NMS Property Maintenance Limited | Construction | 2025 |
| NO Nonsense Removals Ltd | Transport & logistics | 2025 |
| Noah Arcadian Limited | Real estate | 2008 |
| Noah Limited | Extraterritorial | 2002 |
| Noak Ltd | Other services | 2019 |
| Noble City Living (Sheffield) Limited | Households | 2019 |
| Noble City Living Limited | Households | 2019 |
| Noble Investments Holdings Ltd | Real estate | 2021 |
| Noble Living (Doncaster) Limited | Households | 2019 |
| Noble Living (Nottingham) Limited | Real estate | 2009 |
| Noble Living (Sheffield) Limited | Households | 2019 |
| Nocas Services Ltd | Other services | 2024 |
| Nodouzagh Ltd | Information & communication | 2025 |
| Nola Environmental Limited | Professional & scientific | 2024 |
| Nomad Lens Media Ltd | Information & communication | 2024 |
| Nomad Property Maintenance Ltd | Construction | 2026 |
| Nomad UK Solutions Limited | Professional & scientific | 2023 |
| Nomas Management Limited | Professional & scientific | 2024 |
| Nomi's Prezzo 2 Ltd | Hospitality | 2022 |
| NON Slip Shop Ltd | Manufacturing | 2020 |
| NOR4 Ltd | Extraterritorial | 2017 |
| Noranex Ltd | Other services | 2020 |
| Norani Limited | Administrative & support | 2019 |
| Noravan Ltd | Other services | 2020 |
| Nordic Mindfulness CIC | Health & social care | 2021 |
| Norel Ltd | Other services | 2020 |
| Norma Jean Properties Estate and Lettings Agents Ltd | Real estate | 2025 |
| Norman Cargo Ltd | Transport & logistics | 2017 |
| Norman Enterprise Projects Ltd | Administrative & support | 2019 |
| Norpap LLP | | 2009 |
| Norpap Property (Telford) Ltd | Real estate | 2015 |
| Norpap Property 2019 Limited | Real estate | 2019 |
| Norpap Property 2021 Limited | Real estate | 2015 |
| Norpap Property 2024 Limited | Real estate | 2019 |
| Norpap Property 2025 Ltd | Real estate | 2025 |
| Norpap Property 2026 Ltd | Real estate | 2025 |
| Norpap Property Limited | Real estate | 2013 |
| Norry Decorators Ltd | Construction | 2014 |
| North East Green Energy Centre Ltd | Construction | 2024 |
| North Form Solutions Ltd | Wholesale & retail | 2026 |
| North Point Freight Limited | Transport & logistics | 2022 |
| North West Truck Services Limited | Wholesale & retail | 1987 |
| Northern Monkey PUB Company Ltd | Hospitality | 2018 |
| Northumberland Villas Limited | Real estate | 2011 |
| Northwood Group Holdings Ltd | Manufacturing | 2019 |
| Northwood Hygiene Products Limited | Manufacturing | 2009 |
| Northwood Logistics Limited | Transport & logistics | 2012 |
| Norton Design Services Ltd | Professional & scientific | 2004 |
| NOT Just a Print Ltd | Manufacturing | 2020 |
| Nothing to Lose Everything to Gain Ltd | Wholesale & retail | 2025 |
| Notjust (International) CIC | Wholesale & retail | 2022 |
| Notochord Equine Concierge Ltd | Professional & scientific | 2025 |
| Nourish Holistic Wellbeing Ltd | Health & social care | 2018 |
| Nova (Shropshire) Cleaning Ltd | Administrative & support | 2023 |
| Nova Ground Engineering Ltd | Professional & scientific | 2025 |
| Nova Stone Properties Ltd | Households | 2025 |
| Nova United Football Club Ltd | Arts & recreation | 2025 |
| Novaheart Limited | Information & communication | 2025 |
| Novalume Trade Limited | Wholesale & retail | 2026 |
| Novocaddy Ltd | Manufacturing | 2024 |
| NOVOLOS01 Limited | Information & communication | 2024 |
| Novosierra Limited | Professional & scientific | 2017 |
| Novu the Salon Ltd | Other services | 2024 |
| Nowoled Ltd | Other services | 2019 |
| NOX Consultancy Limited | Information & communication | 2023 |
| Nozalin Ltd | Administrative & support | 2019 |
| NP Care Services Ltd | Health & social care | 2024 |
| NRP Holdings Ltd | Real estate | 2019 |
| NS & GP Consultants Ltd | Wholesale & retail | 2025 |
| Nsiah Consultancy Limited | Professional & scientific | 2025 |
| NSJ Express Training Limited | Education | 2024 |
| NT Assets Limited | Professional & scientific | 2025 |
| NT Technology Group Limited | Information & communication | 2004 |
| NTB Haulage Ltd | Transport & logistics | 2025 |
| NTH Degree Consulting Limited | Professional & scientific | 2011 |
| Ntis Investments Ltd | Manufacturing | 2014 |
| NTM Logistics Ltd | Transport & logistics | 2018 |
| Ntudor Limited | Professional & scientific | 2012 |
| Nu:Move Limited | Real estate | 2013 |
| Nuevue Ltd | Information & communication | 2012 |
| Numonde Limited | Professional & scientific | 2019 |
| Nuplace Limited | Real estate | 2015 |
| Nursery Gardens Management 2022 Limited | Real estate | 2022 |
| Nurture ME Psychological Services Ltd | Health & social care | 2016 |
| Nurtured Future Living Cartrefi Ltd | Health & social care | 2021 |
| Nutcrackers Salon Limited | Other services | 2005 |
| Nutrix Curae Ltd | Professional & scientific | 2017 |
| NX Insights Limited | Professional & scientific | 2022 |
| NYK Transport Ltd | Transport & logistics | 2015 |
| Nyreggs Services Limited | Transport & logistics | 2019 |
| O Losie! Ltd | Wholesale & retail | 2024 |
| O'Shea International Limited | Wholesale & retail | 2022 |
| O. Ajaja and Company Limited | Health & social care | 2024 |
| O.T. Performance Limited | Other services | 2022 |
| O.V.R Management Ltd | Households | 2025 |
| Oak Ellerton Limited | Construction | 2010 |
| Oak Leaf Gates Limited | Administrative & support | 2021 |
| Oak Meadows Management Company (NO 1) Limited | Households | 1992 |
| Oak Meadows Management Company (NO 2) Limited | Households | 1994 |
| Oakenbridge Properties Ltd | Financial services | 2023 |