| Next Generation Living Ltd | Construction | 2024 |
| Next Generation Solar Ltd | Construction | 2020 |
| Next Generation Technologies Ltd | Information & communication | 2020 |
| Next Generation Websites Limited | Information & communication | 2024 |
| Next Trading and Services Limited | Wholesale & retail | 2022 |
| Next UK Recycling Ltd | Wholesale & retail | 2025 |
| Nextra Marketing Limited | Wholesale & retail | 2025 |
| Nexus Computing Solutions Limited | Information & communication | 1983 |
| Nexus Transfers Limited | Transport & logistics | 2022 |
| Nexuss Logistics Ltd | Transport & logistics | 2026 |
| Nfdic Ltd | Health & social care | 2015 |
| NFW Construction Ltd | Construction | 2007 |
| NG Networks Ltd | Information & communication | 2025 |
| NGB Discos Limited | Arts & recreation | 2019 |
| NGC Logistics Swindon Ltd | Transport & logistics | 2019 |
| Ngensys Limited | Professional & scientific | 2024 |
| Ngif Ltd | Professional & scientific | 2015 |
| Ngmd Logistics Ltd | Transport & logistics | 2023 |
| Nhaxis Limited | Information & communication | 2016 |
| Nhdc Holdings Limited | Financial services | 2016 |
| NIA NIA Limited | Wholesale & retail | 2008 |
| Niall's Barbershop Limited | Other services | 2026 |
| Nice AGE Ltd | Administrative & support | 2018 |
| Nice Bounce Limited | Arts & recreation | 2023 |
| Nice Clean Ltd | Administrative & support | 2012 |
| Nice Holdings Limited | Financial services | 2025 |
| Nice Motorcycles Ltd | Wholesale & retail | 2021 |
| Nice Nuts Ltd | Real estate | 2011 |
| Niche Financial Solutions LLP | | 2009 |
| Nicholls & Willis Ltd | Hospitality | 2022 |
| Nicholls Healthcare Solutions Ltd | Health & social care | 2016 |
| Nick Hancox Groundworks Limited | Construction | 2011 |
| Nick Thomson Limited | Administrative & support | 2014 |
| Nick Tuckett Ltd | Real estate | 2019 |
| Nickpriceconsulting Ltd | Information & communication | 2022 |
| Nicky Philipps Ltd | Arts & recreation | 2012 |
| Nicnav Ltd | Hospitality | 2019 |
| Nicola York Recruitment Ltd | Administrative & support | 2019 |
| Nicoleta Adelina Ltd | Transport & logistics | 2021 |
| Nicomed Ltd | Health & social care | 2021 |
| NICU91 Ltd | Transport & logistics | 2018 |
| Niculescuandrei Ltd | Transport & logistics | 2024 |
| Nidaguard Ltd | Information & communication | 2026 |
| Nidhiry Edhub Ltd | Education | 2025 |
| Nifa Children & Families Consultancy Ltd | Health & social care | 2023 |
| Nigekin Equestrian Ltd | Agriculture & fishing | 2022 |
| Nigel B Butler Limited | Professional & scientific | 2007 |
| Nigel Emmett Holdings Ltd | Financial services | 2025 |
| Nigel Services Ltd | Transport & logistics | 2024 |
| Nightcut Limited | Wholesale & retail | 2025 |
| Nigomart Limited | Wholesale & retail | 2014 |
| Nihal Properties Development Ltd | Real estate | 2019 |
| Nika Logistic Limited | Transport & logistics | 2016 |
| Nikcarnig Ltd | Hospitality | 2013 |
| Niky Borisov Limited | Transport & logistics | 2025 |
| Nile Clothing UK Limited | Wholesale & retail | 2025 |
| Nilo Group Company Ltd | Real estate | 2025 |
| Nimilo Limited | Wholesale & retail | 2023 |
| Nims Foods Limited | Hospitality | 2022 |
| Nina Stenning Limited | Information & communication | 2019 |
| Ninefifths Limited | Real estate | 2025 |
| Ninety-One Sixty Ltd | Information & communication | 2020 |
| Ning Thai Massage Ltd | Other services | 2025 |
| Ninja Security Services Ltd | Administrative & support | 2024 |
| Nippon Paint Automotive (UK) Limited | Manufacturing | 1991 |
| Nippymac Ltd | Real estate | 2022 |
| Nira Homes Ltd | Real estate | 2025 |
| Nirvair Dhaliwal Services Ltd | Transport & logistics | 2026 |
| Nirvana IT Solutions Ltd | Information & communication | 2010 |
| Nisa Internet and Computer Solutions Limited | Information & communication | 2000 |
| Nisias Ltd | Health & social care | 2022 |
| Nisma Consulting Ltd | Financial services | 2020 |
| Nismilan Ltd | Hospitality | 2023 |
| Nissi Business Solutions Ltd | Health & social care | 2010 |
| Nitrogen Limited | Administrative & support | 2017 |
| Nivayas Research Limited | Professional & scientific | 2006 |
| NJ Development and Construction Ltd | Construction | 2024 |
| NJ289 Ltd | Hospitality | 2024 |
| NJF Consulting Limited | Professional & scientific | 2024 |
| Njord Power Consulting Ltd | Professional & scientific | 2026 |
| NJW Homes Ltd | Real estate | 2026 |
| NK (London) Consulting Limited | Professional & scientific | 2025 |
| NK Credit Consultancy Ltd | Professional & scientific | 2017 |
| NK Management Limited | Extraterritorial | 2006 |
| Nkat Capital Ltd | Real estate | 2024 |
| Nkdhillon Ltd | Health & social care | 2023 |
| NKF Associates Limited | Construction | 2025 |
| Nkftech Ltd | Wholesale & retail | 2021 |
| Nkosi Academy Limited | Education | 2019 |
| Nkosi Security Services Limited | Administrative & support | 2013 |
| Nkunate Limited | Health & social care | 2019 |
| NLF1 Limited | Financial services | 2002 |
| NLK Property Ltd | Real estate | 2024 |
| NM Goods Ltd | Other services | 2023 |
| Nmanolis Breaks Ltd | Wholesale & retail | 2025 |
| Nmatic.Ai Ltd | Professional & scientific | 2024 |
| Nmsc Holdings Ltd | Hospitality | 2023 |
| NMW Architects Ltd | Professional & scientific | 2009 |
| NMW Consulting Limited | Professional & scientific | 2019 |
| NN176 Ltd | Hospitality | 2025 |