| Naughty Llama Ltd | Manufacturing | 2022 |
| Naughty Robots Limited | Information & communication | 2013 |
| Navigate Send Ltd | Education | 2026 |
| Naylor Technical Services Ltd | Manufacturing | 2022 |
| Nayrileys Limited | Other services | 2015 |
| NBH Pro Consult Limited | Information & communication | 2011 |
| Ncending Ltd | Wholesale & retail | 2026 |
| NCG Business Services Limited | Administrative & support | 2015 |
| ND Corridor Logistics Ltd | Transport & logistics | 2026 |
| NDF Electrical Services Ltd | Construction | 2017 |
| Necs Neathey Electrical Control Systems Limited | Construction | 2014 |
| Nedec UK Ltd | Wholesale & retail | 2011 |
| Needham & Co Ltd | Households | 2024 |
| Neena Ltd | Real estate | 2023 |
| Neerutechnologies Ltd | Information & communication | 2015 |
| Negomi Associates Limited | Real estate | 2004 |
| Nellihouse Limited | Health & social care | 2006 |
| Nelly's Construction Ltd | Construction | 2017 |
| Nelsonhall Employee Trustee Limited | Extraterritorial | 2022 |
| Nelsonhall Ltd | Information & communication | 1998 |
| NEO Facilities Services Ltd | Administrative & support | 2025 |
| NEO INK Studio Ltd | Professional & scientific | 2025 |
| NEO Resin Floors Ltd | Construction | 2014 |
| Neon Monkey Ltd | Arts & recreation | 2026 |
| Neovant Limited | Professional & scientific | 2025 |
| NEP (UK) Investments Limited | Financial services | 2006 |
| NEP Broadcast Solutions UK Ltd. | Information & communication | 2007 |
| NEP UK Limited | Information & communication | 2004 |
| Nerf GUN Party Services Limited | Arts & recreation | 2017 |
| Nest & Nook Ltd | Real estate | 2024 |
| Nest Care Homes Ltd | Health & social care | 2016 |
| Nest Computing Limited | Professional & scientific | 1985 |
| Nestings Property Limited | Real estate | 2019 |
| Nestings Self Storage Limited | Real estate | 1993 |
| Netcaretelligence Ltd | Information & communication | 2019 |
| Netgear UK Limited | Information & communication | 2007 |
| Netmatter Limited | Information & communication | 2008 |
| Netscout Systems (UK) Limited | Information & communication | 1996 |
| Netthe.Net Limited | Other services | 1999 |
| Networking IT Ltd | Information & communication | 2022 |
| Neugertransport Limited | Transport & logistics | 2025 |
| Neurodivergent by Design Ltd | Information & communication | 2025 |
| Neurodiversity Health Ltd. | Health & social care | 2022 |
| Neville Winston Ltd | Wholesale & retail | 2021 |
| New AGE Flooring Limited | Administrative & support | 2013 |
| New Bracknell Sushi Ltd | Hospitality | 2024 |
| New Galaxy Limited | Wholesale & retail | 2024 |
| New GEN Champs Ltd | Real estate | 2024 |
| New Local Lettings Ltd | Real estate | 2026 |
| New Richmond Chauffeurs Ltd | Transport & logistics | 2024 |
| New Season Support Ltd | Real estate | 2018 |
| Neway Food Ltd | Transport & logistics | 2017 |
| Newbold College | Education | 1996 |
| Newman L Limited | Wholesale & retail | 2014 |
| Newstar Fastenings Limited | Wholesale & retail | 2002 |
| Newtown Pippin Ltd | Hospitality | 2026 |
| Nexedge Technologies Ltd | Information & communication | 2025 |
| Next Day Clean Ltd | Administrative & support | 2025 |
| Next Select Ltd | Professional & scientific | 2018 |
| Nextgen Envisions Ltd | Information & communication | 2025 |
| Nexusclicks Retail Ltd | Wholesale & retail | 2024 |
| NFC NO 2 Limited | Professional & scientific | 1972 |
| NFC NO 3 Limited | Professional & scientific | 1972 |
| NGM Digital Ltd | Financial services | 2017 |
| Nibbl.It Ltd | Information & communication | 2024 |
| Nice Developments Limited | Construction | 2017 |
| Nichols Capital Ltd | Financial services | 2026 |
| Nick Green Consulting Ltd | Professional & scientific | 2017 |
| NICK96 Ltd | Construction | 2023 |
| Nicolas Jaouen Ltd | Professional & scientific | 2019 |
| Nicolay Transport Limited | Transport & logistics | 2015 |
| Nightflare Media Ltd | Professional & scientific | 2026 |
| Nijo Homes Ltd | Real estate | 2023 |
| Nike Construction Limited | Construction | 1983 |
| Nike Group Hotels Limited | Hospitality | 1991 |
| Nike Land Securities Limited | Professional & scientific | 1976 |
| Nik’S Waste Collection Ltd | Water & waste | 2023 |
| Nila M. Beauty Limited | Wholesale & retail | 2025 |
| Nile Technology Systems Limited | Information & communication | 2013 |
| Nilebridge Ltd | Administrative & support | 2025 |
| Nimmy's Limited | Wholesale & retail | 2020 |
| Nine Eight Acquisitions & Consultancy Ltd | Administrative & support | 2019 |
| Nine Eight Business Solutions Ltd | Financial services | 2025 |
| Nineteen Eighty Three Ltd | Information & communication | 2023 |
| Nirai Ltd | Hospitality | 2026 |
| Nischaya Ltd | Information & communication | 2024 |
| Nixilla Ltd | Information & communication | 2020 |
| NJ & an Properties Ltd | Real estate | 2026 |
| NJT Estates Limited | Real estate | 2021 |
| NK Beauty Spa Ltd | Other services | 2024 |
| NK Square Limited | Real estate | 2022 |
| NM Coaching & Consulting Limited | Professional & scientific | 2022 |
| NO.1 Rodent and Roofing Solutions Limited | Construction | 2024 |
| NO7 Services Limited | Wholesale & retail | 2021 |
| Nobil Ltd | Construction | 2020 |
| Noise Control Designs Limited | Extraterritorial | 2005 |
| Noomaskin Limited | Wholesale & retail | 2020 |
| Norris Post Production Ltd | Information & communication | 2022 |
| Nortech (UK) Ltd | Administrative & support | 2014 |
| North Electrical Installations LLP | | 2023 |