| Nichola Stokes Case Management Limited | Health & social care | 2020 |
| Nicholas James Properties Ltd | Real estate | 2024 |
| Nick Brown Consulting Limited | Professional & scientific | 2016 |
| Nick Campion Limited | Professional & scientific | 2002 |
| Nick Gregory Limited | Manufacturing | 2011 |
| Nicky Calthrop-Owen Limited | Professional & scientific | 2003 |
| Nico's Gelato Ltd | Manufacturing | 2023 |
| Nicola Bell Ltd | Professional & scientific | 2016 |
| Nicola Michelle Parr Limited | Financial services | 2022 |
| Nicolas & Erika Ltd | Transport & logistics | 2025 |
| Niella's Delivery Services Ltd | Transport & logistics | 2025 |
| Nigel Dodsley Site Engineering Limited | Construction | 2007 |
| Nigel Smedley Limited | Information & communication | 2005 |
| Nightingale Global Ltd | Health & social care | 2021 |
| Nightingale Holdings (Derby) Ltd | Wholesale & retail | 2017 |
| Nightingale Legal Services Limited | Professional & scientific | 2022 |
| Nightingale Mews Management Company (Derby) Limited | Real estate | 2001 |
| Nightingale Solicitors Limited | Professional & scientific | 2022 |
| NII Comms Limited | Professional & scientific | 2017 |
| NIK Conlon Ltd | Professional & scientific | 2024 |
| Nikab Ltd | Transport & logistics | 2016 |
| Nikibo's Emporium Ltd | Hospitality | 2025 |
| Nikitenko Trans Ltd | Transport & logistics | 2018 |
| Nikki's Nurseries Ltd | Education | 2013 |
| Nikkiz Beauty Ltd | Other services | 2018 |
| Nikon Metrology UK Limited | Manufacturing | 1998 |
| Nikov Engineering Solutions Ltd | Professional & scientific | 2025 |
| Niku Collective Ltd | Wholesale & retail | 2026 |
| Nilah Studio Ltd | Professional & scientific | 2024 |
| Nilpat Capital Limited | Real estate | 2021 |
| Nilpat Funding Limited | Real estate | 2022 |
| Nilpat Holdings Limited | Financial services | 2022 |
| Nimbus Disability Ltd | Professional & scientific | 2006 |
| Nims Holdings Limited | Real estate | 2023 |
| Nina Baxter Garden Design Limited | Administrative & support | 2002 |
| Ninba Limited | Information & communication | 2022 |
| Nine Dots Development Limited | Education | 2016 |
| Nine Fifteen Clothing Limited | Manufacturing | 2016 |
| Nine Seven Tungsten Ltd | Wholesale & retail | 2021 |
| NINETY2 Ltd | Real estate | 2024 |
| Ninja Properties Ltd | Real estate | 2016 |
| Ninth House Consulting Ltd | Professional & scientific | 2026 |
| Nipera Ltd | Other services | 2016 |
| Nippon Auto Parts Ltd | Wholesale & retail | 2021 |
| Nippon Auto Spares Limited | Wholesale & retail | 2006 |
| Nippon Autos Limited | Extraterritorial | 2022 |
| NIQ Energies Ltd | Professional & scientific | 2022 |
| Nirmarc Ltd | Information & communication | 2012 |
| NIS Digital Limited | Information & communication | 2022 |
| NIS EOT Limited | Financial services | 2023 |
| NIS Maintenance Limited | Construction | 2022 |
| Nishaani Ltd | Information & communication | 2020 |
| Nisma Limited | Health & social care | 2024 |
| Nistca Limited | Professional & scientific | 2022 |
| Nite Limited | Wholesale & retail | 2006 |
| Nith Aggregates Limited | Extraterritorial | 2008 |
| Nivec Ltd | Professional & scientific | 2016 |
| Nivid Innovative Solutions Ltd | Information & communication | 2024 |
| NIX Construction Limited | Construction | 2009 |
| Nixinfinity - AI Ltd | Information & communication | 2017 |
| Nixon Properties Ltd | Real estate | 2020 |
| NJ Eagers Ltd | Wholesale & retail | 2024 |
| NJ4 Ltd | Hospitality | 2025 |
| NJA Building Services Ltd | Construction | 2019 |
| NJA Inspection Limited | Professional & scientific | 2016 |
| Njhg Properties Ltd | Real estate | 2024 |
| NJL Property Investments Ltd | Real estate | 2019 |
| NJM Property Consulting Ltd | Construction | 2019 |
| Njmh Property Group Ltd | Real estate | 2026 |
| Njordstrōm Ltd | Construction | 2023 |
| NJP Joinery Ltd | Construction | 2022 |
| Njpa Ltd | Education | 2018 |
| NJQ Services Ltd | Information & communication | 2025 |
| Njss Consulting Ltd | Information & communication | 2019 |
| Njss Property Ltd | Real estate | 2020 |
| NK Building Ltd. | Construction | 2017 |
| NK Community Healthcare Limited | Health & social care | 2023 |
| NK Consult Ltd | Mining & quarrying | 2018 |
| NK Motorgroup Ltd | Financial services | 2015 |
| NKA Holidays Ltd | Administrative & support | 2020 |
| NL Rail Services Ltd | Professional & scientific | 2022 |
| NLB Safety Limited | Public administration | 2025 |
| Nlcl Holdings Limited | Financial services | 2023 |
| NLK Construction Limited | Construction | 2008 |
| NLT Convenience Store Ltd | Wholesale & retail | 2024 |
| NM IT Consulting Limited | Information & communication | 2010 |
| NMJ Risk Consulting Limited | Professional & scientific | 2021 |
| Nmjs Properties Ltd | Real estate | 2025 |
| NML Property Holdings Ltd | Real estate | 2024 |
| NMW Group Limited | Wholesale & retail | 2023 |
| NN Healthcare Limited | Health & social care | 2015 |
| NO 1 Local Mini Market Limited | Wholesale & retail | 2026 |
| NO 10 Coffee House Limited | Hospitality | 2018 |
| NO 10 Hair Salon Ltd | Other services | 2018 |
| NO 10 Leasing Ltd | Real estate | 2018 |
| NO Limit Recruitment's Ltd | Extraterritorial | 2021 |
| NO More Dirt Ltd | Administrative & support | 2019 |
| NO Ordinary Rental Ltd | Real estate | 2017 |
| NO. 11 Deli Limited | Wholesale & retail | 2008 |
| NO. 3 Pride Place LLP | | 2004 |