| NG9 Burger Ltd | Hospitality | 2025 |
| NG9 Developments Ltd | Real estate | 2017 |
| NG9 Healthcare Ltd | Health & social care | 2018 |
| NG9 Partners Ltd | Administrative & support | 2023 |
| Ngan's at UK Limited | Information & communication | 2025 |
| NGE Research Ltd | Professional & scientific | 2016 |
| Nggyu Limited | Information & communication | 2021 |
| NGM Construction (UK) Ltd | Construction | 2021 |
| NGM Holdings (UK) Ltd | Financial services | 2020 |
| NGM Plant (UK) Ltd | Administrative & support | 2020 |
| NGM Property (UK) Ltd | Real estate | 2020 |
| NGP Services Ltd | Construction | 2021 |
| Ngrewire Ltd | Construction | 2025 |
| Ngulepp PVT Limited | Health & social care | 2017 |
| Nguyen Properties UK Ltd | Real estate | 2020 |
| Ngvape Carlton Hill Limited | Wholesale & retail | 2017 |
| Ngvape Nottingham Limited | Wholesale & retail | 2017 |
| NH Housing Management Services Limited | Real estate | 2024 |
| NH68MS Teams Limited | Real estate | 2023 |
| NHB Asset Management Ltd | Real estate | 2021 |
| Nhine Ltd | Construction | 2024 |
| NHT Estates Ltd | Real estate | 2026 |
| Nhta Limited | Other services | 1993 |
| Nhung Beauty Limited | Other services | 2025 |
| NIA Investment Group Ltd | Real estate | 2023 |
| NIA Locum Limited | Health & social care | 2024 |
| Nian JIN Limited | Hospitality | 2024 |
| Niazai Food Ltd | Hospitality | 2022 |
| Nibb Ltd | Wholesale & retail | 2026 |
| Nibbles Notts Ltd | Hospitality | 2022 |
| Nibbleweight Limited | Agriculture & fishing | 2026 |
| Nibizo Limited | Health & social care | 2017 |
| Nibon Investments Ltd | Real estate | 2021 |
| NIC Greaves Public Transport Limited | Professional & scientific | 2017 |
| NIC Group Limited | Professional & scientific | 2009 |
| Nice Films Ltd | Professional & scientific | 2020 |
| Niceruby Limited | Wholesale & retail | 2026 |
| Nicf Limited | Other services | 2017 |
| Nicha Limited | Health & social care | 2022 |
| Niche Academy & Training Centre Ltd | Education | 2026 |
| Niche Chien Ltd | Other services | 2021 |
| Niche Creation Publishing Ltd | Information & communication | 2022 |
| Niche Research & Consulting Limited | Administrative & support | 2007 |
| Niche Services Group Limited | Professional & scientific | 2025 |
| Niche Software Recruitment Limited | Administrative & support | 2021 |
| Niche Supplies 247 Limited | Wholesale & retail | 2018 |
| Nicholas Anthony Ltd | Professional & scientific | 2022 |
| Nicholas Flatt Ltd | Professional & scientific | 2021 |
| Nicholas O'Hara Funeral Directors Limited | Extraterritorial | 2006 |
| Nicholls Electrical Ltd | Construction | 2021 |
| Nichols Holdings Ltd | Real estate | 2021 |
| Nick Arron Limited | Financial services | 2011 |
| Nick Barry Services Ltd | Health & social care | 2025 |
| Nick Cawthorne Associates Limited | Professional & scientific | 2013 |
| Nick Dunmur Limited | Professional & scientific | 2003 |
| Nick Holdsworth Limited | Professional & scientific | 2019 |
| Nick Lawton Estate Agent Limited | Real estate | 2026 |
| Nick Mccann Associates Ltd | Administrative & support | 2005 |
| Nick Merryfield LLP | | 2013 |
| Nick Padovano Plumbing & Heating Ltd | Construction | 2014 |
| Nicklin Read Developments Limited | Real estate | 2016 |
| Nicky Long Ltd | Professional & scientific | 2024 |
| Nicky Silver HR Services Limited | Administrative & support | 2024 |
| Nicm Ltd | Professional & scientific | 2025 |
| Nicnezhad Consultancy Limited | Professional & scientific | 2022 |
| Nicola Rose Sensory Ltd | Education | 2025 |
| Nicola Valentine Limited | Information & communication | 2011 |
| Nicolas Cleaner Ltd | Administrative & support | 2023 |
| Nicole Beales Estates Ltd | Real estate | 2022 |
| Nicoll Mcbrayne Limited | Professional & scientific | 2022 |
| Nicotech Global Ltd | Information & communication | 2025 |
| Nictek Ltd | Information & communication | 2018 |
| Nicu Caus Electrical Ltd | Construction | 2018 |
| Nidoland Limited | Professional & scientific | 1985 |
| Nield Investments Ltd | Financial services | 2022 |
| Nieto Gonzalez Design Ltd | Information & communication | 2023 |
| Nieto Gonzalez Developments Limited | Professional & scientific | 2025 |
| Nieto Gonzalez Properties Ltd | Real estate | 2022 |
| Nieucon Leases Ltd | Real estate | 2025 |
| Nieucon Ltd | Construction | 2022 |
| Nieves ROS Limited | Health & social care | 2019 |
| Nigel Cooke Associates Ltd | Professional & scientific | 2021 |
| Nigel Feckey Electrical Limited | Construction | 2017 |
| Nigel Mitchell Consultancy Ltd | Administrative & support | 2012 |
| Nigel Percy Limited | Professional & scientific | 2004 |
| Nigel Reeves Planning & Urban Design Limited | Professional & scientific | 2007 |
| Nightingale Care Providers Ltd | Real estate | 2024 |
| Nightingale Design Research Ltd | Information & communication | 2016 |
| Nightingale House Limited | Health & social care | 2024 |
| Niji Print Ltd | Extraterritorial | 2023 |
| Niji Print UK Ltd | Extraterritorial | 2023 |
| NIK Renew Energy Limited | Professional & scientific | 2025 |
| Nikan Ltd | Transport & logistics | 2010 |
| Nikimhas Limited | Real estate | 2009 |
| Nikita Business Solutions Limited | Transport & logistics | 2014 |
| Nikk Probuild Ltd | Construction | 2025 |
| Nikki J. Limited | Professional & scientific | 2021 |
| Nikki Louise Ltd | Hospitality | 2024 |
| Nikki P Consultancy Limited | Professional & scientific | 2024 |
| Nikolaos Flaris Limited | Health & social care | 2013 |