| Nexavault Ltd | Information & communication | 2025 |
| Nexavista Limited | Professional & scientific | 2023 |
| Nexgen Electrical Services Ltd | Construction | 2017 |
| Nexgen Insurance Solutions Ltd | Financial services | 2018 |
| Nexome Properties Ltd | Real estate | 2025 |
| Nexora Academy Ltd | Education | 2024 |
| Nexora Devlabs Ltd | Information & communication | 2025 |
| Next Enterprise Ltd | Construction | 2023 |
| Next GEN YOU Ltd | Education | 2021 |
| Next Level (Productions) Limited | Arts & recreation | 2017 |
| Nextgen ERP Consulting Ltd | Information & communication | 2026 |
| Nextgen Trucking Ltd | Transport & logistics | 2025 |
| Nextmune Laboratories Ltd | Professional & scientific | 1999 |
| Nextmune Ltd | Professional & scientific | 2011 |
| Nexur Technology Ltd | Information & communication | 2025 |
| Nexus Accounting SOL Ltd | Professional & scientific | 2025 |
| Nexus Accounting Solutions Ltd | Professional & scientific | 2019 |
| Nexus Financial Services Ltd | Financial services | 2020 |
| Nexus Tech Talent Ltd | Administrative & support | 2021 |
| NGT Services (Bucks) Ltd | Administrative & support | 2017 |
| NH Building and Carpentry Limited | Construction | 2016 |
| NHA Therapy Ltd | Wholesale & retail | 2020 |
| NHB Management Ltd | Administrative & support | 2020 |
| Nibble and Nourish Limited | Hospitality | 2017 |
| Nicci Kurland Consulting Ltd | Professional & scientific | 2015 |
| Nice GUY Collective Limited | Hospitality | 2022 |
| Nice-Name.Com Limited | Information & communication | 1999 |
| Nichol Trading Limited | Wholesale & retail | 2025 |
| Nicholas James Financial Consultancy Limited | Financial services | 2022 |
| Nicholas Transit Ltd | Transport & logistics | 2019 |
| Nicholson & Griffin Limited | Other services | 2010 |
| Nicholson Griffin (Hairdressers) Limited | Other services | 2003 |
| Nick Blanks Consulting Ltd. | Professional & scientific | 2006 |
| Nick General Building Ltd | Construction | 2022 |
| Nick Phillips Limited | Professional & scientific | 2021 |
| Nickd Staffing Limited | Administrative & support | 2023 |
| Nicky Gill Limited | Professional & scientific | 2020 |
| Niclen + Publitec UK Limited | Wholesale & retail | 2025 |
| Nico&Sary Limited | Construction | 2015 |
| Niger-Connect Limited | Information & communication | 2018 |
| Nightingale Austen Designs Ltd | Professional & scientific | 2024 |
| Nightingale Drive(Totteridge) Management Company Limited | Households | 2011 |
| Nightingales Investments Limited | Financial services | 2018 |
| Nikita Productions Ltd | Arts & recreation | 2019 |
| Nikitany Ltd | Professional & scientific | 2006 |
| Nikki's Bountiful Bakery Ltd | Manufacturing | 2013 |
| Nima Interim Ltd | Professional & scientific | 2024 |
| Nimba Investments Limited | Administrative & support | 2025 |
| Nimble IT Consulting Ltd | Information & communication | 2018 |
| Nimble Tree Wood Management Company Limited | Households | 2001 |
| Nimbus (Aeropark) Management Limited | Real estate | 2006 |
| Nimsai Properties Ltd | Real estate | 2024 |
| Nina-Sandra Limited | Hospitality | 2025 |
| Nine Acres 1964 Limited | Extraterritorial | 2014 |
| Ninit Limited | Information & communication | 2015 |
| Ninja Code Academy Limited | Education | 2015 |
| Ninja OWL Limited | Information & communication | 2023 |
| Ninja Sparx Ltd | Manufacturing | 2024 |
| Niran Limited | Wholesale & retail | 2015 |
| Niru & Janan Limited | Real estate | 2018 |
| Nisaa' by Noor Ltd | Wholesale & retail | 2021 |
| Nitak Accounting Limited | Professional & scientific | 2010 |
| Nival Consulting Ltd | Information & communication | 2026 |
| Niyana Ltd | Wholesale & retail | 2025 |
| NJ Commercial Ltd | Real estate | 1998 |
| NJM Hayes Ltd | Real estate | 2020 |
| NJM Ventures Ltd | Wholesale & retail | 2020 |
| NKV Consultancy Ltd | Professional & scientific | 2025 |
| NL Staffing Limited | Administrative & support | 2024 |
| Nlteach CIC | Information & communication | 2026 |
| Nmac Lighting Ltd | Wholesale & retail | 2009 |
| Nmreh Ltd | Financial services | 2026 |
| NN Corporate Limited | Wholesale & retail | 2026 |
| NO Bonus Casino Limited | Information & communication | 2025 |
| NO Bull Promotions Ltd | Information & communication | 2020 |
| NO Go Security Products Limited | Wholesale & retail | 2007 |
| No-Id Studio Ltd | Information & communication | 2021 |
| NO. 12 Chambers Ltd | Professional & scientific | 2019 |
| NO. 3 Belsize Park RTM Limited | Households | 2007 |
| NO. 61 Collective Limited | Other services | 2024 |
| NO1 Nail Supply London Ltd | Wholesale & retail | 2022 |
| Noctilune Publishing Ltd | Information & communication | 2024 |
| Node Studios Ltd | Professional & scientific | 2010 |
| Nodeledge Ltd | Information & communication | 2024 |
| Noel Willcox U/Lez Claims Ltd | Financial services | 2025 |
| Nogal MED Limited | Health & social care | 2023 |
| Nolly Sushi Ltd | Hospitality | 2023 |
| Nomad Transport Ltd | Transport & logistics | 2013 |
| Nomas Consultancy Ltd | Professional & scientific | 2025 |
| Nomi Electronics Limited | Wholesale & retail | 2016 |
| Noodle NOW UK Ltd | Hospitality | 2025 |
| Noor & Sons Plumbing & Heating Limited | Construction | 2023 |
| Noor Muhammad Medical Ltd | Health & social care | 2017 |
| Norden Transport Ltd | Transport & logistics | 2014 |
| Norfolk Rentals Ltd | Real estate | 2026 |
| Normandy Holders Ltd | Real estate | 2026 |
| Normandy Motorcycle Club Limited | Arts & recreation | 2016 |
| Norris Interiors Ltd | Construction | 2025 |
| North Home Counties Renewables Limited | Construction | 2026 |
| North Wharf Gardens Management Company Limited | Extraterritorial | 2014 |