| Next GEN Office Solutions Limited | Information & communication | 2018 |
| Next Getaway Ltd | Administrative & support | 2024 |
| Next Informations Ltd | Information & communication | 2023 |
| Next Stride HR Ltd | Professional & scientific | 2025 |
| Nextgen Careers Ltd | Education | 2025 |
| Nextgen Leisure Limited | Arts & recreation | 2025 |
| Nextgen Resources Limited | Wholesale & retail | 2020 |
| Nextgens Recruiters Ltd | Information & communication | 2025 |
| Nexus Hospitality Ltd | Professional & scientific | 2022 |
| Nexus Project Solutions Ltd | Information & communication | 2024 |
| Nexusiq Ltd | Professional & scientific | 2023 |
| Nfon UK Ltd | Information & communication | 2013 |
| NGU UN Limited | Real estate | 2014 |
| NHC International UK Limited | Wholesale & retail | 2026 |
| Niche H R Limited | Professional & scientific | 1999 |
| Niche Legal Solutions Limited | Other services | 2009 |
| Niche Real Estate (UK) Ltd | Construction | 2012 |
| Niche Real Estate 1 (UK) Ltd | Construction | 2023 |
| Niche Trading (UK) Limited | Wholesale & retail | 2006 |
| Nichola Murray Limited | Health & social care | 2018 |
| Nicholas Alexander Executive Search Limited | Administrative & support | 2008 |
| Nicholas Dawkes Photography Limited | Professional & scientific | 2011 |
| Nicholsons House Ltd | Real estate | 2025 |
| Nick Bonner Camera Solutions Ltd | Information & communication | 2007 |
| Nick Campbell Landscapes Ltd | Administrative & support | 2025 |
| Nick Herbert Limited | Professional & scientific | 2013 |
| Nick Landscaping Ltd | Administrative & support | 2025 |
| Nicola Coulson Limited | Health & social care | 2022 |
| Nidey Ltd | Real estate | 2022 |
| Nigel Wolfin Consulting Services Limited | Professional & scientific | 2025 |
| Nightstar Therapeutics Limited | Financial services | 2017 |
| Nightstarx Limited | Professional & scientific | 2013 |
| Niia Prints Ltd | Manufacturing | 2023 |
| Nimbus PRG Ltd | Professional & scientific | 2002 |
| Nimraa Engineering Limited | Construction | 2016 |
| Nina Zenovya Limited | Other services | 2015 |
| Nindos Ltd | Professional & scientific | 2025 |
| Ninety Two Technologies Limited | Information & communication | 2026 |
| Nirox Specialist Coatings Ltd | Construction | 2021 |
| Nisof Ltd | Professional & scientific | 2024 |
| Nite & Day Bray Limited | Wholesale & retail | 2024 |
| Nivision Consulting Ltd | Professional & scientific | 2025 |
| NJ & SJ Estates (UK) Limited | Real estate | 2015 |
| NJC Heating Limited | Construction | 2018 |
| NJE Consulting Limited | Professional & scientific | 2025 |
| NJK Logistics Ltd | Transport & logistics | 2025 |
| Njwe Services Limited | Education | 2013 |
| Nkms Estates Ltd | Real estate | 2024 |
| Nkod Project Management Ltd | Professional & scientific | 2026 |
| NL & Associates (Expert Witness) Limited | Other services | 2025 |
| NM Qsing Limited | Professional & scientific | 2014 |
| NMC Advisory Limited | Professional & scientific | 2018 |
| NO Divots Ltd | Arts & recreation | 2025 |
| NO Questions Asked Limited | Financial services | 2016 |
| NO. 413 Upper Richmond Road Management Company Limited | Households | 1976 |
| Noah Accounting Limited | Professional & scientific | 2010 |
| Noble House Red Limited | Wholesale & retail | 2013 |
| Noblebright Limited | Wholesale & retail | 1983 |
| Node Commodities UK Limited | Administrative & support | 2013 |
| Node Trading London Limited | Administrative & support | 2016 |
| Noel Daly Ltd | Construction | 2014 |
| Noididn'T Ltd | Arts & recreation | 2023 |
| Nolcell Limited | Real estate | 1979 |
| Non-Executive Directors Association Limited | Extraterritorial | 2007 |
| Non-Executive Directors Training and Publishing Limited | Education | 2006 |
| Noname London Limited | Extraterritorial | 2014 |
| Norden Farm Centre for the Arts Limited | Arts & recreation | 2005 |
| Norden Farm Management Company Limited | Households | 1994 |
| Norden Farm Productions Limited | Arts & recreation | 2014 |
| Norfolk Park Store Limited | Wholesale & retail | 2015 |
| Noria Consultants Ltd | Administrative & support | 2018 |
| Norsekem Limited | Manufacturing | 2006 |
| Norstorm Ltd | Information & communication | 2018 |
| Nortech Precision Engineering Limited | Construction | 2012 |
| North Properties (2024) Limited | Real estate | 2024 |
| Northbound Performance Partners Ltd | Professional & scientific | 2026 |
| Northclaire Ltd | Professional & scientific | 2025 |
| Northumberland Energy Recovery Holdings Ltd | Financial services | 2006 |
| Northumberland Energy Recovery Ltd | Water & waste | 2006 |
| Northumberland Waste Management Limited | Water & waste | 1991 |
| Northumbria Holdings Ltd | Households | 2015 |
| Northwood (Maidenhead) Limited | Real estate | 2015 |
| Nortonwood Limited | Real estate | 2007 |
| Norville-Brice Ltd | Construction | 2023 |
| Norwalk Estates Ltd | Real estate | 2007 |
| Norwich House (Maidenhead) Residents Limited | Households | 1992 |
| Notley Abbey Ltd | Administrative & support | 2020 |
| Noumed Life Sciences Limited | Professional & scientific | 2013 |
| Nourish INK Limited | Wholesale & retail | 2017 |
| Nova AI Consulting Ltd | Professional & scientific | 2025 |
| Novara Clinic Ltd | Other services | 2021 |
| Novara Investors LLP | | 2024 |
| Novazrehh Tech Solutions Ltd | Wholesale & retail | 2026 |
| Novon Capital Limited | Financial services | 2026 |
| NOW Group UK Ltd | Manufacturing | 1999 |
| NP & AK Investments Ltd | Real estate | 2020 |
| NPB Music Limited | Arts & recreation | 2013 |
| NPB Property Ltd | Real estate | 2025 |
| NPS Property Renovations Ltd | Real estate | 2025 |
| Npvp Properties Ltd | Real estate | 2021 |