| Newton IT Limited | Extraterritorial | 2002 |
| Newton IT Solutions Limited | Information & communication | 2000 |
| Newtons Commercial Ltd | Real estate | 2019 |
| Newtown Security Installations Ltd | Administrative & support | 2016 |
| Newville Solutions Limited | Hospitality | 2010 |
| Newwave Limited | Education | 2026 |
| Newworld Property Groups Ltd | Real estate | 2021 |
| NEX GEN Tech Solutions Ltd | Wholesale & retail | 2020 |
| Nexa Clothing Ltd | Wholesale & retail | 2021 |
| Nexa Setu Ltd | Wholesale & retail | 2026 |
| Nexatel Ltd | Wholesale & retail | 2026 |
| Nexgen FC Limited | Arts & recreation | 2025 |
| Nexgen Real Estate EDI Limited | Real estate | 2025 |
| Nexgen Real Estate Limited | Real estate | 2024 |
| Nexify Solutions UK Limited | Information & communication | 2012 |
| Nexisbiz Limited | Professional & scientific | 2024 |
| Nexo Estate Ltd | Real estate | 2026 |
| Nexora E-Commerce UK Private Limited Limited | Wholesale & retail | 2026 |
| Nexora Pharma Limited | Real estate | 2025 |
| Nexora Technology Ltd | Information & communication | 2026 |
| Nexora Webvibe Ltd | Wholesale & retail | 2025 |
| Nexovia AI Limited | Information & communication | 2026 |
| Next Generation Solutions and Innovations Ltd | Information & communication | 2024 |
| Next Level Palace Limited | Arts & recreation | 2018 |
| Next Step Health Ltd | Professional & scientific | 2020 |
| Next Trade Limited | Wholesale & retail | 2025 |
| Next Vision Group Ltd | Manufacturing | 2026 |
| Nextcore Dynamics Ltd | Information & communication | 2024 |
| Nextel Ltd | Wholesale & retail | 2018 |
| Nextgear Automotive Limited | Wholesale & retail | 2025 |
| Nextgen Abroad Ltd | Education | 2025 |
| Nextgn Tech Ltd | Information & communication | 2014 |
| Nextphase Property Ltd | Real estate | 2025 |
| Nextride LDN Ltd | Transport & logistics | 2025 |
| Nextsave Limited | Other services | 2001 |
| Nextstep Agency Limited | Administrative & support | 2026 |
| Nextwave Investments Ltd | Real estate | 2018 |
| Nextwix Ltd | Wholesale & retail | 2022 |
| Nexuconnect Limited | Health & social care | 2014 |
| Nexura Nextgen Ltd | Information & communication | 2026 |
| Nexus Dynamics Consulting Ltd | Information & communication | 2024 |
| Nexus Finz Ltd | Professional & scientific | 2023 |
| Nexus Fostering Limited | Health & social care | 2005 |
| Nexus Global Traders Ltd | Wholesale & retail | 2025 |
| Nexus Investment Solutions (UK) Limited | Real estate | 2025 |
| Nexus Keystone Properties Limited | Real estate | 2019 |
| Nexus Talentz Ltd | Administrative & support | 2025 |
| Nexus Visas Limited | Other services | 2019 |
| Nexus Visas Specialist Limited | Administrative & support | 2011 |
| Nexvora Wholesale Ltd | Wholesale & retail | 2026 |
| NEZ Ltd | Construction | 2023 |
| NF2 Create Limited | Professional & scientific | 2017 |
| Nfinitii Bullion Limited | Manufacturing | 2024 |
| NFK Venture Ltd | Real estate | 2022 |
| NFT Venue Limited | Administrative & support | 2021 |
| NG Financial Solutions Ltd | Professional & scientific | 2009 |
| NG Real Estate Ltd | Real estate | 2018 |
| NG Scaffolding Limited | Construction | 2015 |
| NGA IT Services Limited | Information & communication | 2013 |
| Ngaiwinghong Limited | Information & communication | 2024 |
| Nganmuaythai Ltd | Arts & recreation | 2025 |
| NGM Financial Consultants Limited | Financial services | 2000 |
| NGP Digital Consulting Limited | Information & communication | 2018 |
| Ngsk Properties Ltd | Real estate | 2025 |
| NH Marketing LLP | | 2022 |
| NHA Healthcare Limited | Real estate | 2018 |
| NHQ Consulting Limited | Information & communication | 2015 |
| NHV Trading Limited | Wholesale & retail | 2020 |
| NI Edtech 2 LLP | | 2015 |
| Niam Holdings Limited | Real estate | 2022 |
| Niana Apartments NO 1 Limited | Real estate | 2018 |
| Nias Holdings Limited | Financial services | 2021 |
| Niasoh Limited | Professional & scientific | 2015 |
| Niayara Global Limited | Wholesale & retail | 2007 |
| NIB GAS Ltd | Professional & scientific | 2021 |
| Niblow Ltd | Hospitality | 2024 |
| NIC Civil Engineering Ltd | Construction | 2023 |
| Nice Cool Stuff Limited | Wholesale & retail | 2020 |
| Nice Smile (UK) Limited | Health & social care | 2008 |
| Niche Connect Ltd | Hospitality | 2025 |
| Niche Mouth Limited | Professional & scientific | 2024 |
| Nichenova Ltd | Wholesale & retail | 2026 |
| Nicholas 1939 Limited | Other services | 2011 |
| Nicholas North Associates Limited | Financial services | 2016 |
| Nicholls Court (Hillingdon) Limited | Households | 1988 |
| Nicholson & Maydo Properties Ltd | Other services | 2020 |
| Nicholson Carter Limited | Financial services | 2010 |
| Nick Construct Limited | Construction | 2021 |
| Nick Home Improvement Limited | Construction | 2012 |
| Nicki Fabulous! Ltd | Hospitality | 2020 |
| Nickolas Burnett & Associates Limited | Health & social care | 2008 |
| Nickra Ltd | Professional & scientific | 2025 |
| Nicks Green Trees Limited | Agriculture & fishing | 2026 |
| Nicks Hypnotherapy Ltd | Other services | 2023 |
| Nicksava Limited | Transport & logistics | 2025 |
| Nicmac Design Ltd | Information & communication | 2018 |
| Nico Tiling Ltd | Construction | 2024 |
| Nicolae Atasiei Ltd | Construction | 2022 |
| Nicolas Cons Ltd | Construction | 2024 |
| Nicole London Limited | Other services | 2011 |