| Ncloud IT Services Limited | Information & communication | 2022 |
| ND Electrical and Building Services Ltd | Construction | 2018 |
| NDC Holdings Essex Ltd | Financial services | 2025 |
| Nearest Laundry Ltd | Other services | 2021 |
| Nectar DRY Cleaners Ltd | Manufacturing | 2021 |
| NED Construction Ltd | Construction | 2024 |
| Neednabs Ltd | Wholesale & retail | 2025 |
| Neemark Property Limited | Real estate | 2014 |
| Neffycare Ltd | Health & social care | 2015 |
| Nelson&Co Ltd | Administrative & support | 2023 |
| Neon Care & General Services Ltd | Health & social care | 2018 |
| Nepy Ltd | Construction | 2023 |
| Nerin Edinburgh Limited | Real estate | 2021 |
| Nerin Holdings Ltd | Real estate | 2021 |
| Neriuxxx Ltd | Transport & logistics | 2025 |
| Neron Automation Ltd | Construction | 2020 |
| Nest & Jest Ltd | Wholesale & retail | 2025 |
| Nest Homes UK Limited | Real estate | 2025 |
| Nest HR Ltd | Administrative & support | 2025 |
| Network Construction Solutions Limited | Construction | 2017 |
| Network Groundswork Rail Limited | Construction | 2025 |
| Network Interiors 23 Ltd | Construction | 2023 |
| Network Like a Boss Limited | Administrative & support | 2019 |
| Network UK Consultancy Limited | Information & communication | 2004 |
| Neural Nexus Limited | Wholesale & retail | 2023 |
| Neutral Capital Finance PLC | Financial services | 2019 |
| New Beginnings (Homes) Ltd | Real estate | 2020 |
| New Builds Digital Limited | Information & communication | 2026 |
| New Chef Ltd | Hospitality | 2025 |
| New China City Ltd | Hospitality | 2026 |
| New Circle UK Ltd | Professional & scientific | 2026 |
| New Claims Ltd | Other services | 2025 |
| New Generation Builders Ltd | Construction | 2019 |
| New Holland Holding Limited | Professional & scientific | 1992 |
| New Holland Limited | Professional & scientific | 1991 |
| New Impex Parts Ltd | Wholesale & retail | 2025 |
| New Level Soccer Group Ltd | Arts & recreation | 2022 |
| New MAK Ltd | Wholesale & retail | 2024 |
| New Mortgages Ltd | Financial services | 2018 |
| New Sigma Designs Ltd | Wholesale & retail | 2025 |
| New Towns Network Ltd | Information & communication | 2025 |
| New Vision Ents Ltd | Arts & recreation | 2023 |
| New Wave Financial Services Ltd | Financial services | 2017 |
| New Wave Legals Limited | Professional & scientific | 2024 |
| Newdawn Cleaning Services Essex Limited | Administrative & support | 2021 |
| Newell Calibration Services Limited | Professional & scientific | 2019 |
| Newman Property Service's Ltd | Other services | 2011 |
| Newman Training Limited | Education | 2024 |
| Nexa Talent Solutions Ltd | Administrative & support | 2023 |
| Nexgen Tech Services Ltd | Professional & scientific | 2025 |
| Nexmark Trading Ltd | Wholesale & retail | 2025 |
| Next Click Limited | Wholesale & retail | 2022 |
| Next GEN Roofing & Building Ltd | Construction | 2022 |
| Next Level Clearances Limited | Transport & logistics | 2026 |
| Next Level Competitions Ltd | Administrative & support | 2025 |
| Next Level Talent Limited | Professional & scientific | 2015 |
| Nextflow Ltd | Extraterritorial | 2010 |
| Nextgear Ltd | Administrative & support | 2015 |
| Nexus & Co Limited | Transport & logistics | 2012 |
| Nexus Land and Planning Ltd | Construction | 2023 |
| Nexusweb Solutions Limited | Wholesale & retail | 2023 |
| Nexvia Holding Limited | Financial services | 2025 |
| NGA Firestopping Ltd | Construction | 2025 |
| NGA Transport Ltd | Transport & logistics | 2024 |
| Ngage Business Solutions Limited | Arts & recreation | 2018 |
| NGL Services Limited | Other services | 2015 |
| Nhsp Holdings Ltd | Financial services | 2023 |
| Ni.C.E.Bulding Ltd | Wholesale & retail | 2025 |
| NIA Investment Limited | Professional & scientific | 2019 |
| Niart Sportswear Ltd | Wholesale & retail | 2023 |
| Niazi Evler Ltd | Real estate | 2022 |
| Nibo Group Ltd | Transport & logistics | 2026 |
| Nice Flow Care & Employment Limited | Administrative & support | 2021 |
| Niche Box Group Limited | Financial services | 2021 |
| Niche Consultancy (UK) Limited | Professional & scientific | 2008 |
| Nicholas Construction Ipswich Limited | Construction | 2015 |
| Nicholas Estates (Ipswich) Ltd | Real estate | 2020 |
| Nicholas Estates Limited | Real estate | 2005 |
| Nicholas Financial Limited | Professional & scientific | 2014 |
| Nicholas Homes Limited | Real estate | 2005 |
| Nicholas Rashford Mega Limited | Wholesale & retail | 2025 |
| Nicholson Collective Ltd | Wholesale & retail | 2026 |
| Nick and Zayne Ltd | Wholesale & retail | 2020 |
| Nick Hanks Drylining Limited | Construction | 2018 |
| Nicki Miles PMU Ltd | Other services | 2021 |
| Nickson D Ltd | Health & social care | 2024 |
| Nicnetwork Ltd | Transport & logistics | 2025 |
| Nico&Twins Limited | Construction | 2020 |
| Nicola Phillips Limited | Professional & scientific | 2007 |
| Nicola Portway Kitchens Limited | Professional & scientific | 2022 |
| Nicorn Trade House Ltd | Wholesale & retail | 2024 |
| Nidez Services Limited | Administrative & support | 2024 |
| Nightwolf Guarding Ltd | Financial services | 2026 |
| Nikeeta PT Fitness Ltd | Arts & recreation | 2020 |
| Nikitas Airport Transfers Ltd | Transport & logistics | 2019 |
| Nikki's Cosmetics Limited | Other services | 2025 |
| Niko 17 Ltd | Transport & logistics | 2020 |
| Niko Logistics Ltd | Transport & logistics | 2018 |
| Nikolat Holdings Ltd | Real estate | 2023 |
| Nikyi Healthcare Limited | Health & social care | 2021 |