| Ninazucha Limited | Transport & logistics | 2016 |
| Nine Acre Films Limited | Information & communication | 2012 |
| Nine Edge Wealth Limited | Financial services | 2025 |
| Nine Grounds Limited | Administrative & support | 1995 |
| Nine Harley Place Limited | Households | 1988 |
| Nine Lives Club Ltd | Wholesale & retail | 2026 |
| Nine Schools Ltd | Wholesale & retail | 1997 |
| Nine Yards Bell Tents Ltd | Administrative & support | 2023 |
| Nines Golf Ltd | Arts & recreation | 2026 |
| Nineteen Consulting Limited | Professional & scientific | 2020 |
| Nineteen Sixty Nine Limited | Wholesale & retail | 2022 |
| Ninety-Days Limited | Professional & scientific | 2007 |
| Ninja Alliance Ltd | Wholesale & retail | 2013 |
| Ninja Engineering Limited | Professional & scientific | 2025 |
| Ninth Life Clothing Limited | Wholesale & retail | 2025 |
| Ninthstone Ltd | Information & communication | 2025 |
| Nioa UK Ltd | Public administration | 2024 |
| Niobar Capital Ltd | Professional & scientific | 2026 |
| Nipper Creative Ltd | Information & communication | 2025 |
| Nippychecks Ltd | Construction | 2022 |
| Niram Ltd | Wholesale & retail | 2026 |
| Niranjanan Limited | Transport & logistics | 2016 |
| Nirav Gohil and Company Limited | Information & communication | 2010 |
| Nirman Sewak Jatha Sikh Heritage Limited | Other services | 2011 |
| Nirrol Limited | Financial services | 1891 |
| Nirton Limited | Real estate | 2015 |
| Nirvaanah Ltd | Hospitality | 2026 |
| Nisbets Limited | Wholesale & retail | 1983 |
| Nitai Clothing Limited | Wholesale & retail | 2015 |
| Nitch Products Ltd | Construction | 2024 |
| Nitya Engineering Services Ltd | Professional & scientific | 2024 |
| NIV Transport Fast Service Ltd | Transport & logistics | 2025 |
| Nivo Digital Ltd | Information & communication | 2017 |
| Nixar Consulting Ltd | Professional & scientific | 2021 |
| Nixon Garage Ltd | Wholesale & retail | 2024 |
| NJ Autos Limited | Wholesale & retail | 2021 |
| NJ Building Group Ltd | Real estate | 2023 |
| NJ Ductwork Installations Ltd | Construction | 2019 |
| NJ Laity & SON Ltd | Construction | 2025 |
| NJ Plumbing & Heating Ltd | Construction | 2013 |
| NJ Stonework Limited | Construction | 2026 |
| NJ Thompson Consulting Limited | Professional & scientific | 2024 |
| Nj&C Properties Ltd | Hospitality | 2026 |
| NJA Engineering Design Services Ltd | Administrative & support | 2015 |
| Njaa Catering Ltd | Other services | 2022 |
| NJB Research Limited | Information & communication | 2015 |
| NJC Productions Ltd | Information & communication | 2024 |
| NJE Maintenance Ltd | Construction | 2018 |
| Njeri Limited | Health & social care | 2019 |
| NJM Contracting Ltd | Information & communication | 2018 |
| NJM Health and Education Limited | Health & social care | 2017 |
| NJM Property Services Limited | Real estate | 2018 |
| Njmc Ltd | Health & social care | 2023 |
| Njoets Ltd | Education | 2025 |
| Njola Ltd | Health & social care | 2016 |
| Njowamu Ltd | Health & social care | 2024 |
| Njoylife Limited | Manufacturing | 2017 |
| NJR Consulting Ltd | Professional & scientific | 2025 |
| NJS Business Consulting Limited | Real estate | 1995 |
| NJS Consulting (Bristol) Limited | Administrative & support | 2019 |
| NJT Concrete Cancer Repair Specialist Ltd | Construction | 2019 |
| NJT Developments Ltd | Construction | 2018 |
| NJU Construction Services Limited | Construction | 2019 |
| NJW Associates Limited | Administrative & support | 2003 |
| NK Aero Ltd | Real estate | 2025 |
| NK Barbers U.K Ltd | Other services | 2025 |
| NK Caribbean Kitchen Limited | Hospitality | 2025 |
| NK Facilities Limited | Real estate | 2004 |
| NK Group Holdings Ltd | Financial services | 2018 |
| Nk-Benz Ltd | Wholesale & retail | 2025 |
| NK82 Limited | Information & communication | 2025 |
| Nkangha's Ltd | Health & social care | 2015 |
| NKC Events Ltd | Arts & recreation | 2021 |
| NKC Services (Bristol) Limited | Professional & scientific | 2016 |
| Nkds Consultants Limited | Transport & logistics | 2016 |
| Nkem Trading Ltd | Wholesale & retail | 2024 |
| Nkemason Limited | Health & social care | 2026 |
| Nkirov Ltd | Construction | 2025 |
| NKM Bristol Ltd | Hospitality | 2018 |
| NKS Plastering and Rendering Services Ltd | Construction | 2017 |
| NL Bristol Limited | Real estate | 2010 |
| NL Build (SW) Ltd | Real estate | 2026 |
| NL Consultancy Limited | Health & social care | 2021 |
| NL Reports Limited | Health & social care | 2008 |
| NL Services (SW) Ltd | Real estate | 2018 |
| NLB Health Services Ltd | Financial services | 2023 |
| Nlee Property Management Ltd | Real estate | 2021 |
| NLK Accountants Limited | Professional & scientific | 2024 |
| Nlts Ecomm Ltd | Extraterritorial | 2020 |
| NM Searches Limited | Professional & scientific | 2025 |
| NMA Private Health Ltd | Financial services | 2024 |
| NMC Construction (SW) Ltd | Construction | 2018 |
| NMC Holdings Limited | Administrative & support | 2015 |
| NMC Product Limited | Professional & scientific | 2022 |
| NME Interiors Ltd | Construction | 2023 |
| NMH Management Company Limited | Households | 2015 |
| Nmlj Limited | Other services | 2011 |
| NMM Properties Ltd | Real estate | 2021 |
| NN Chowdhury Company Ltd | Wholesale & retail | 2025 |
| NN Plastic Surgery Limited | Health & social care | 2026 |