| Nick Spalding Consulting Ltd. | Construction | 2014 |
| Nicola Carless Limited | Arts & recreation | 2016 |
| Nido Property Limited | Real estate | 2020 |
| Night Systems Ltd | Arts & recreation | 2026 |
| Nikol Decorating Ltd | Construction | 2025 |
| Nimbu Tree Ltd | Wholesale & retail | 2019 |
| Nine Property Management Ltd | Construction | 2023 |
| Nineteen Investments Limited | Real estate | 2018 |
| Nirbhau Properties Limited | Real estate | 2022 |
| Nirvana Consultancy Limited | Information & communication | 2018 |
| NJC Group Holdings Ltd | Financial services | 2025 |
| NJK Racing Limited | Arts & recreation | 2021 |
| NK Bloodstock Limited | Arts & recreation | 2023 |
| NL Financial Consulting Ltd | Financial services | 2021 |
| NNV Manufacturing Limited | Administrative & support | 2012 |
| NO. 393 Ltd | Hospitality | 2026 |
| NO.25 Bar & Eatery Ltd | Hospitality | 2023 |
| NO1CHURROS Ltd | Wholesale & retail | 2024 |
| Noble Electrical Ltd | Construction | 2015 |
| NOD Topco Ltd | Extraterritorial | 2015 |
| Nodecraft Limited | Wholesale & retail | 2026 |
| Nojobtoosmall Ltd | Extraterritorial | 2012 |
| Nolan Properties Ltd | Real estate | 2016 |
| Nomanco Limited | Wholesale & retail | 2025 |
| Nomsters Ltd | Professional & scientific | 2024 |
| North Lakes Childrens Services Limited | Education | 2006 |
| North Star Utilities Ltd | Energy | 2025 |
| North Street Industrial Management Limited | Real estate | 1986 |
| North Worcestershire Basement Projects Ltd | Administrative & support | 2004 |
| North Worcestershire Properties Limited | Construction | 2003 |
| Northcliffe House Management Limited | Households | 1995 |
| Northdate Limited | Professional & scientific | 2011 |
| Northspark Trade Limited | Wholesale & retail | 2026 |
| Norton Collection Museum Trust | Arts & recreation | 2016 |
| Norton Court Residents Association Limited | Hospitality | 1977 |
| Norton Franklin Limited | Financial services | 2023 |
| NOS Holdings Group Ltd | Financial services | 2025 |
| NOS Hvac Ltd | Construction | 2024 |
| Nova Barber Club Ltd | Other services | 2025 |
| Novabloom Venture Limited | Wholesale & retail | 2025 |
| Novacraft Limited | Wholesale & retail | 2026 |
| Novar Grove Films Ltd | Information & communication | 2024 |
| Novo Lettings Limited | Real estate | 2023 |
| Novus Installations Limited | Manufacturing | 2023 |
| NP Deli Ltd | Hospitality | 2025 |
| NR Aesthetics and Skin Ltd | Other services | 2021 |
| NR Contractors Ltd | Construction | 2014 |
| NRC (Europe) Limited | Professional & scientific | 1998 |
| NRC Developments Ltd | Construction | 2025 |
| Nrdp Ltd | Health & social care | 2016 |
| NS Construction Limited | Construction | 2022 |
| NS Transportation PM Services Ltd | Professional & scientific | 2023 |
| NSH Property Investments Ltd | Real estate | 2025 |
| Nuhs Consulting Ltd | Real estate | 2026 |
| Nura & Noah's ARK Ltd | Health & social care | 2025 |
| Nura & Noah’S Nibbles Ltd | Hospitality | 2026 |
| Nurcycle Ltd | Health & social care | 2025 |
| Nurturing Nest Children's Home Services Limited | Health & social care | 2025 |
| NUS Electric Ltd | Construction | 2024 |
| NUS Fibre Ltd | Construction | 2024 |
| NUS Group Holdings Ltd | Financial services | 2024 |
| NUS Reinstatement Ltd | Construction | 2024 |
| Nutrius Properties Limited | Real estate | 2022 |
| Nutrius UK Bidco Limited | Financial services | 2018 |
| Nutrius UK Holdco Limited | Financial services | 2018 |
| Nutrius UK Midco Limited | Financial services | 2018 |
| Nutrius UK Topco Limited | Financial services | 2018 |
| O & F Property Ltd | Real estate | 2020 |
| O & V Design Limited | Professional & scientific | 2013 |
| O&B Electrical Ltd. | Construction | 2022 |
| O'Neill Electrical Limited | Construction | 2006 |
| Oakchurch Developments Ltd | Construction | 2016 |
| Oakgrove Developments Limited | Real estate | 2022 |
| Oakham Development and Design Ltd | Construction | 2022 |
| Oakland BE Limited | Construction | 2010 |
| Oaklands Furniture Direct Ltd | Wholesale & retail | 2013 |
| Oaklands Furniture Limited | Wholesale & retail | 2011 |
| Oakley Fields Management Company Limited | Households | 2020 |
| Oakline Build Ltd | Manufacturing | 2026 |
| Oakmount Services Limited | Wholesale & retail | 2021 |
| Oaks Life Limited | Professional & scientific | 2017 |
| Oaktree Investments Midlands Limited | Real estate | 2023 |
| Oakvalley Properties Ltd | Extraterritorial | 2012 |
| Oasis ABO Limited | Health & social care | 2024 |
| Oasisglow Limited | Wholesale & retail | 2025 |
| OBP Group Limited | Administrative & support | 2022 |
| OBS Lighting Ltd | Professional & scientific | 2024 |
| Observatory Pictures Limited | Information & communication | 2024 |
| Occupied City Limited | Information & communication | 2020 |
| Ocean Woods Production Limited | Information & communication | 2021 |
| Octave Music Tuition Ltd | Education | 2025 |
| Odin Construction Ltd | Construction | 2025 |
| OFB T/A Oceans Limited | Hospitality | 2025 |
| Offbeat Talent Limited | Other services | 2016 |
| Office Tech Solutions Ltd | Information & communication | 2020 |
| Offpitch Limited | Wholesale & retail | 2024 |
| Offpod Ltd | Construction | 2024 |
| Offsite Expo Limited | Administrative & support | 2022 |
| Ohana Services Limited | Professional & scientific | 2015 |
| OHM Moto Limited | Wholesale & retail | 2024 |