| New Style Glazing Ltd | Construction | 2014 |
| New Style Property Ltd | Real estate | 2024 |
| New Way Associates Limited | Information & communication | 2002 |
| New Way International Ltd | Wholesale & retail | 2003 |
| Newarka Group Ltd | Administrative & support | 2025 |
| Newcapro Limited | Real estate | 2021 |
| Newton Design Limited | Professional & scientific | 2012 |
| Nexgen IT Hub Limited | Information & communication | 2025 |
| Next Generation IT Ltd | Information & communication | 2017 |
| Next Step Rehab Limited | Arts & recreation | 2026 |
| Next Step Training Services Ltd | Education | 2026 |
| Nextgen Tech Innovations Limited | Information & communication | 2024 |
| Nextgen Techs Solutions Ltd | Information & communication | 2025 |
| Nexus Invest Ltd | Real estate | 2019 |
| NF IAM Consultancy Limited | Information & communication | 2026 |
| NFA Construction Ltd | Construction | 2023 |
| NH & Co Trading Ltd | Wholesale & retail | 2023 |
| Nhance Group Ltd | Information & communication | 2019 |
| NIA Courier London Ltd | Transport & logistics | 2023 |
| Nice Cosmic Vibes Ltd | Administrative & support | 2020 |
| Nice World Ltd | Wholesale & retail | 2021 |
| Nicolas Building Ltd | Construction | 2020 |
| Niewierski Ltd | Transport & logistics | 2013 |
| Nifty IT Systems Limited | Information & communication | 2019 |
| Nifty Property Rentals Limited | Real estate | 2023 |
| Niko One Limited | Construction | 2019 |
| Niksy Trading Limited | Wholesale & retail | 2026 |
| Nile Shine Ltd | Wholesale & retail | 2026 |
| Nilkom Limited | Health & social care | 2005 |
| Nimrod & Family Limited | Construction | 2014 |
| Nimtoh Ltd | Hospitality | 2021 |
| Ninip Promotions Ltd | Wholesale & retail | 2014 |
| Nirvana Care Services Ltd | Health & social care | 2022 |
| Nisa Events Limited | Arts & recreation | 2025 |
| Nishi Superstore Limited | Wholesale & retail | 2020 |
| Nistara Investments Limited | Real estate | 2021 |
| Nivank Ltd | Health & social care | 2024 |
| Niwar Construction Ltd | Construction | 2025 |
| Niyati Care Ltd Ltd | Health & social care | 2024 |
| NK Insights Ltd | Administrative & support | 2019 |
| NK Projects Design Ltd | Arts & recreation | 2026 |
| NK Recruitment Limited | Administrative & support | 2022 |
| Nkatas Ltd | Manufacturing | 2019 |
| Nntg Limited | Information & communication | 2009 |
| Nntg Properties Ltd | Real estate | 2015 |
| NO More Damp by MM & M Ltd | Construction | 2023 |
| NO Stresss Building Ltd | Construction | 2018 |
| Noctera Ltd | Wholesale & retail | 2025 |
| Noel Property Management Ltd | Real estate | 2020 |
| Nola Market Ltd | Wholesale & retail | 2026 |
| Nomadic Structures (UK) Limited | Administrative & support | 1986 |
| Noman Investments Ltd | Wholesale & retail | 2021 |
| Non-Stop Film Limited | Information & communication | 2021 |
| Noni Loft Conversions & Extensions Ltd | Construction | 2023 |
| Noor Business Solutions Ltd | Information & communication | 2012 |
| NOR Transport Ltd | Transport & logistics | 2024 |
| North Stallions Ltd | Administrative & support | 2025 |
| North Two Limited | Real estate | 2021 |
| Northern Star Ship Management Limited | Transport & logistics | 2025 |
| Northpole Environmental Ltd | Administrative & support | 2024 |
| Northstar Marketing Limited | Arts & recreation | 1987 |
| Nosh Burgers Ltd | Hospitality | 2024 |
| Nour Luxury Ltd | Wholesale & retail | 2017 |
| Nourvelle Limited | Manufacturing | 2025 |
| Nous CAP Limited | Professional & scientific | 2017 |
| Nova Decor Ltd | Construction | 2025 |
| Nova DRY Ltd | Construction | 2026 |
| Novalux Group Ltd | Wholesale & retail | 2026 |
| Novapharm Healthcare Ltd | Manufacturing | 2025 |
| Novel Travel Ltd | Administrative & support | 2019 |
| Novelty Party Products Limited | Manufacturing | 2016 |
| Noventa Consulting Ltd | Professional & scientific | 2025 |
| Noviak Construction Ltd | Construction | 2024 |
| Novus Apartments Limited | Real estate | 2025 |
| NOW Accountant Limited | Professional & scientific | 2015 |
| NOW Property Limited | Real estate | 2015 |
| NOW Property One Limited | Real estate | 2017 |
| Noyaddins Ltd | Real estate | 2020 |
| Npace Recruitment Ltd | Administrative & support | 2021 |
| NPG Consultancy Ltd | Arts & recreation | 2026 |
| Npkb Ltd | Construction | 2026 |
| NRI Properties Developments Ltd | Construction | 2026 |
| NRI Property Developments Limited | Real estate | 2026 |
| NRJ Feltham Limited | Real estate | 2019 |
| NS Couriers Services Ltd | Transport & logistics | 2025 |
| NSM 2 Contractors Ltd | Construction | 2022 |
| NTK Services Ltd | Professional & scientific | 2020 |
| Numero UNO Estates Ltd | Real estate | 2021 |
| Nunes Consultant Ltd | Construction | 2018 |
| Nunnun Limited | Real estate | 2024 |
| Nunua Ltd | Wholesale & retail | 2019 |
| NUR Branding Ltd | Professional & scientific | 2026 |
| Nyala Technology Solutions Ltd | Information & communication | 2013 |
| Nzozak UK Ltd | Health & social care | 2017 |
| Nztech Ltd | Information & communication | 2021 |
| O Bhatkar Ltd | Hospitality | 2026 |
| OA Installations Ltd | Extraterritorial | 2019 |
| Oakbridge Realty Ltd | Real estate | 2025 |
| Oasis Heritage Wellness Ltd | Health & social care | 2025 |
| Obelisk Properties Limited | Real estate | 2009 |