| Nicmillan Ltd | Other services | 2026 |
| Nicola Minichiello Limited | Arts & recreation | 2010 |
| Nicola Poskitt Medical Aesthetics Ltd | Health & social care | 2025 |
| Nicola Properties Ltd | Real estate | 2024 |
| Nicolas' Robert Ltd | Transport & logistics | 2016 |
| Nicoleta&Sara Ltd | Transport & logistics | 2024 |
| Nicu Badoiu Ltd | Transport & logistics | 2017 |
| Nidd Park Developments Limited | Construction | 2009 |
| Nieuwerkerk Ltd | Construction | 2019 |
| NIF Transport Ltd | Transport & logistics | 2018 |
| Nigel Barker Photography Limited | Professional & scientific | 2005 |
| Nigel Benwell Strategic Planning Limited | Professional & scientific | 2019 |
| Nigel Goodwin Funeral Directors Limited | Other services | 2014 |
| Nigel Wood Property Ltd | Real estate | 2020 |
| Nigel Wood Training Limited | Education | 2016 |
| Nigoa Transport Ltd | Transport & logistics | 2025 |
| Nik&Ade Limited | Transport & logistics | 2020 |
| Niki Transport Ltd | Transport & logistics | 2016 |
| Niko Sorin Logistics Ltd | Transport & logistics | 2020 |
| Nikolett Ltd | Transport & logistics | 2021 |
| Nikyvad Recruitment Ltd | Administrative & support | 2023 |
| Niled Formations LLP | | 2016 |
| Niled Limited | Financial services | 2005 |
| Niles Holdings Limited | Financial services | 2019 |
| Nilo Ltd | Financial services | 2024 |
| Nimat Limited | Transport & logistics | 2026 |
| Nimble Developments Limited | Construction | 2022 |
| Nimbus & Nook Limited | Extraterritorial | 2026 |
| Nimbus Path Logistics Limited | Extraterritorial | 2026 |
| Nimg Limited | Hospitality | 2008 |
| Ninehundred Communications Group Limited | Wholesale & retail | 1983 |
| Nineleven Events Ltd | Professional & scientific | 2025 |
| Nineteen Forty Eight Ltd | Real estate | 2023 |
| Ninety Four Long Lane Ltd | Real estate | 2024 |
| Ninth Square Investments Limited | Real estate | 2018 |
| Nirvair Investments Limited | Real estate | 2020 |
| Nisa Distribution Limited | Wholesale & retail | 2011 |
| Nitrac Property Investments Ltd | Real estate | 2017 |
| Nitty Enterprise Ltd | Wholesale & retail | 2019 |
| Niven and Flynn Properties Ltd | Real estate | 2004 |
| Niwr Consulting Ltd | Professional & scientific | 2020 |
| Nixim Property Limited | Real estate | 2025 |
| Nixon Investment Holdings Limited | Financial services | 2019 |
| Niyaz Pizza Limited | Hospitality | 2025 |
| NJ Lynch Plastering Services Ltd | Construction | 2019 |
| NJ Point Ltd | Construction | 2023 |
| NJB Construction Contracting Limited | Construction | 2023 |
| Njdj Limited | Other services | 2025 |
| NJH Estimating Services Limited | Construction | 2013 |
| Njpi Limited | Financial services | 2016 |
| NJS Services (Yorkshire) Limited | Professional & scientific | 2026 |
| NJW 2018 Limited | Hospitality | 2018 |
| NK Joinery Limited | Construction | 2013 |
| NK Safe Storage Ltd | Transport & logistics | 2026 |
| NKC Car Services Ltd | Wholesale & retail | 2024 |
| NKC Joinery & Electrical Limited | Construction | 2010 |
| NKF Construction Ltd | Construction | 2024 |
| NKP Engineering Limited | Manufacturing | 2019 |
| NKS Prime Ltd | Wholesale & retail | 2022 |
| NKW Transport Ltd | Transport & logistics | 2023 |
| NL Catering Ltd | Hospitality | 2023 |
| NL Landscape and Gardening Services Ltd | Administrative & support | 2026 |
| NLC Rentals Ltd | Real estate | 2024 |
| NLE Property Ltd | Real estate | 2025 |
| Nljc Holding Limited | Financial services | 2025 |
| NLK Limited | Health & social care | 2005 |
| NLM 86 Limited | Financial services | 2017 |
| Nlms Properties Limited | Real estate | 2025 |
| NM AV Services Ltd | Administrative & support | 2024 |
| NM Clinic & Training Ltd. | Other services | 2022 |
| NM Property London Ltd | Construction | 2018 |
| NMR Limited | Construction | 2017 |
| NMS Holding Limited | Financial services | 2023 |
| Nnaoma Consulting Limited | Health & social care | 2021 |
| NO 1 Hair & Beauty (Doncaster) Limited | Other services | 2021 |
| NO 1 on the High Street Ltd | Wholesale & retail | 2025 |
| NO 1 Sunbeds (Doncaster) Limited | Other services | 2021 |
| NO.16 Coffee House & Bar Limited | Hospitality | 2024 |
| NO1 Hairstyle Gents Salon Ltd | Other services | 2024 |
| NO1 Property Lease & Investment Ltd | Real estate | 2025 |
| Noa-Mat NDT Limited | Professional & scientific | 2020 |
| Noah and HIS DAD Limited | Financial services | 2023 |
| Noah's ARK (U.K.) Limited | Other services | 2016 |
| Noah's ARK Dog Day School (Hull) Limited | Other services | 2017 |
| Noahs ARK HU9 Ltd | Other services | 2025 |
| Noble Interiors Group Limited | Construction | 2026 |
| Noble International Construction Group Limited | Construction | 2026 |
| Noble International Development Group Ltd | Construction | 2023 |
| Noble Welding & Fabrication Ltd | Manufacturing | 2026 |
| Noblebridge Financial Ltd | Extraterritorial | 2026 |
| Noblepixels Ltd | Professional & scientific | 2023 |
| Nocturnal Performance Limited | Wholesale & retail | 2026 |
| Nofi Engineering Solutions Ltd | Professional & scientific | 2018 |
| Noir Vision Media Ltd | Information & communication | 2026 |
| Noise & Vibration Consultants Limited | Administrative & support | 2003 |
| Nolan (Management Services) Limited | Construction | 2012 |
| Nolan Moore Limited | Professional & scientific | 2022 |
| Nolan's Tree Services & Landscapes Ltd | Administrative & support | 2025 |
| Nomads Accident Repair Ltd | Wholesale & retail | 2024 |
| Nomex Enterprises Ltd | Extraterritorial | 2015 |