| Nadia Altinbas Limited | Other services | 2013 |
| Nadire Ltd | Manufacturing | 2024 |
| Nahrain Production Ltd | Information & communication | 2019 |
| Nail Galaxy Limited | Other services | 2026 |
| Nailpad Limited | Wholesale & retail | 2014 |
| Namberk Limited | Real estate | 2023 |
| Napier Design & Engineering Ltd | Manufacturing | 2010 |
| Narayanan Limited | Information & communication | 2023 |
| Narok Ltd | Administrative & support | 2020 |
| Nars UK Consulting Limited | Professional & scientific | 2017 |
| Nascent Fashion Studio Limited | Manufacturing | 2016 |
| Nastassia Pelle Ltd | Information & communication | 2023 |
| Natalie Jahangiry Limited | Professional & scientific | 2014 |
| Natalie Mews Management (Fulwell) Limited | Households | 1994 |
| Nathan Prosser Heating & Plumbing Ltd | Construction | 2020 |
| Natropolis 279 Ltd | Professional & scientific | 2010 |
| Natural Ecology Mitigation Limited | Health & social care | 2008 |
| Natural Trading Limited | Wholesale & retail | 2017 |
| Nature Cures ALL Ltd | Health & social care | 2025 |
| Natures Nurture on Wheels Limited | Hospitality | 2024 |
| Nayaghar Realty Ltd | Real estate | 2024 |
| NBN Cleaning Limited | Administrative & support | 2026 |
| NCC Facilities Limited | Extraterritorial | 2014 |
| ND Dynamics Ltd | Information & communication | 2024 |
| NDF International Limited | Information & communication | 1998 |
| Ndudu UK Ltd | Hospitality | 2013 |
| NEA Hair & Beauty Ltd | Other services | 2021 |
| Neat Building Services Ltd | Construction | 2023 |
| Needle App Limited | Professional & scientific | 2016 |
| Nefertiti Jewelry Ltd | Wholesale & retail | 2025 |
| Negeen Auto Care Ltd | Wholesale & retail | 2022 |
| Neil Beck Associates Ltd | Administrative & support | 2013 |
| Nel's Beauty Limited | Other services | 2019 |
| Nelson RTM Company Limited | Households | 2015 |
| Nemo Cafe Tree Ltd | Hospitality | 2015 |
| NEO AU Physio and Wellness Limited | Health & social care | 2025 |
| NEO Integrated Systems Limited | Administrative & support | 2015 |
| NEO System Automation Limited | Construction | 2017 |
| Neon Rainbow Productions Ltd | Information & communication | 2020 |
| Nerdflex Ltd | Wholesale & retail | 2025 |
| Nerdy Union Limited | Information & communication | 2020 |
| Nerfday Boys Ltd | Health & social care | 2018 |
| Nerium Holding Limited | Real estate | 2018 |
| NES Associates Ltd | Professional & scientific | 2023 |
| Network Facility Point Limited | Real estate | 2010 |
| Network Talent Limited | Administrative & support | 2021 |
| Neuro Objective Press Limited | Information & communication | 2011 |
| Nevada&Bill Kyaw WIN Ltd | Real estate | 2021 |
| New Hall Retreat Ltd | Real estate | 2012 |
| New Illumination Ltd | Arts & recreation | 2012 |
| New Lucky Garden Limited | Hospitality | 2025 |
| New Tech Suppliez Ltd | Other services | 2025 |
| New Trade Enterprise Ltd | Manufacturing | 2017 |
| New Zealand Avenue Properties 45-51 Limited | Real estate | 2002 |
| Newheath Accountancy Ltd | Extraterritorial | 2000 |
| Newheath Accountancy Services Ltd | Professional & scientific | 2016 |
| Newland House School Trust Limited | Education | 1971 |
| Newline Pharmacy Limited | Wholesale & retail | 1998 |
| Newonk Ltd | Health & social care | 2023 |
| News Publishers (Digital) Limited | Information & communication | 2020 |
| Nexaura Property Group Ltd | Real estate | 2025 |
| Next GEN Contracts Ltd | Construction | 2022 |
| Next REP Ltd | Real estate | 2020 |
| Next Solution Holding Limited | Financial services | 2023 |
| Next Stop Worldwide Ltd | Administrative & support | 2021 |
| Nextgen Electrical Services (Trading AS Nexgen Electrics) Ltd | Construction | 2025 |
| Nextyou Turkiye Limited | Administrative & support | 2025 |
| Nexusi Partners Ltd | Professional & scientific | 2025 |
| NFC Drinks (UK) Limited | Manufacturing | 2024 |
| NGP Digital Ltd | Information & communication | 2021 |
| NGS Business Solutions Limited | Administrative & support | 2011 |
| NGS Management Limited | Administrative & support | 2011 |
| NIA Medicals Ltd | Professional & scientific | 2016 |
| Niche Mode Management Ltd | Administrative & support | 2023 |
| Nick Deeming Limited | Professional & scientific | 2015 |
| Nick Webb Consulting Limited | Professional & scientific | 2017 |
| Nick’S Grooming Ltd | Other services | 2026 |
| Nicoll Road Nursery Limited | Health & social care | 2011 |
| Nigel Hare Joinery Limited | Construction | 2006 |
| Nikhita Limited | Information & communication | 2016 |
| Nikson & Co Property Maintenance Services Ltd | Construction | 2023 |
| Nikson & Co Property Management Ltd | Construction | 2020 |
| Nilkanth Store Ltd | Wholesale & retail | 2024 |
| Nilu Enterprise Ltd | Wholesale & retail | 2022 |
| Nimaro Ltd | Health & social care | 2019 |
| Nimbus Aerial Surveys + Photography LLP | | 2015 |
| Nimbus Nine Consulting Limited | Professional & scientific | 2018 |
| Nine Elms F.C Ltd | Education | 2021 |
| Ninethree Ventures Ltd | Professional & scientific | 2026 |
| Ninety-Nine Monkeys Ltd | Arts & recreation | 2009 |
| NIP Autos Ltd | Wholesale & retail | 2021 |
| NK Skyrocket Ltd | Financial services | 2022 |
| NKU Limited | Financial services | 2021 |
| NLW Health Ltd | Other services | 2019 |
| NM Bros Fitness Ltd | Real estate | 2022 |
| NMA Property Holdings Ltd | Real estate | 2025 |
| NMP Property Investments Ltd | Real estate | 2022 |
| Nobel Properties Ltd | Real estate | 2023 |
| Nomissfit Ltd | Health & social care | 2025 |
| North Star Placement Limited | Financial services | 2025 |