| New Haden Metals Limited | Wholesale & retail | 1971 |
| New Moon Campers Limited | Administrative & support | 2023 |
| New Standards Group Ltd | Real estate | 2026 |
| New Wave Hair Stylist Ltd | Other services | 2021 |
| New Westpoint Investments Ltd | Construction | 2023 |
| Newborn Baby Posing Limited | Professional & scientific | 2012 |
| Newbrush Cleaning Services Co. Ltd | Administrative & support | 2010 |
| Newco (Barclay House Manchester) Limited | Construction | 2022 |
| Newco (Belmont House Crawley) Limited | Construction | 2024 |
| Newco (Chobham Road Woking) Limited | Construction | 2026 |
| Newco (LUX Share Holdings) Limited | Real estate | 2024 |
| Newco (Newport Road Cardiff) Limited | Construction | 2023 |
| Newco (Stepping Lane Norwich) Limited | Construction | 2022 |
| Newham Consultants Limited | Professional & scientific | 2026 |
| Newleaf Property Services Ltd | Real estate | 2025 |
| Newnettle Limited | Information & communication | 2019 |
| Newtown Investments Limited | Administrative & support | 2010 |
| Newukcars Limited | Wholesale & retail | 2025 |
| Nexclowd Labs Ltd | Information & communication | 2025 |
| Nextech Group Limited | Administrative & support | 2024 |
| Nextgen Ultrasound Ltd | Health & social care | 2014 |
| Nezzo Enterprises Ltd | Wholesale & retail | 2022 |
| Ng's Family Private Investment (UK) Limited | Financial services | 2025 |
| Nglocum Ltd | Wholesale & retail | 2023 |
| Ngrs Property Maintenance Limited | Households | 2020 |
| NH113 Properties Ltd | Real estate | 2024 |
| NHT KUS Ltd | Professional & scientific | 2021 |
| NIC Desserts Ltd | Hospitality | 2025 |
| Nick Bailey Tree Services Limited | Administrative & support | 2002 |
| Nick Dunn Plumbing Limited | Wholesale & retail | 2025 |
| Nick Smith Consultancy Limited | Professional & scientific | 2019 |
| Nicola JAY Academy Limited | Education | 2017 |
| Nicola M Davies Limited | Real estate | 2020 |
| Nicole Farhi Limited | Wholesale & retail | 2012 |
| Nicole Jones Communications Ltd. | Administrative & support | 2013 |
| Nightingale Holdings Ltd | Households | 2016 |
| Nik's Places Limited | Real estate | 2017 |
| Nikalyte Limited | Professional & scientific | 2019 |
| Niko & Xander Ltd | Hospitality | 2025 |
| Niloofar Accounting Ltd | Professional & scientific | 2023 |
| Nimbus Backup Ltd | Information & communication | 2019 |
| Nimma Commercial Properties Ltd | Real estate | 2025 |
| Nimma Properties Limited | Real estate | 2023 |
| Nimma Property Investments Ltd | Real estate | 2024 |
| Ninjasinc Ltd | Professional & scientific | 2024 |
| Nisha's Physio Care Ltd | Health & social care | 2025 |
| Nithya Analytics Limited | Information & communication | 2026 |
| NIX Services Limited | Financial services | 2019 |
| Nixon Developments Ltd | Real estate | 2024 |
| Njmp Ltd | Real estate | 2025 |
| NJS Vapes Limited | Wholesale & retail | 2014 |
| NKA Elevators Ltd | Manufacturing | 2024 |
| NLP Solutions Limited | Professional & scientific | 2018 |
| Nmani Properties Ltd | Real estate | 2022 |
| NMC Consulting Limited | Professional & scientific | 2020 |
| NMR Medical Ltd | Health & social care | 2019 |
| NO Fluff Marketing Ltd | Professional & scientific | 2026 |
| Noble Career Consultant & Recruitment Ltd | Professional & scientific | 2025 |
| Noble House Developments Limited | Real estate | 2022 |
| Noble Properties & Developers Ltd | Real estate | 2017 |
| Nolomind Ltd | Other services | 2025 |
| Nomads Bar Ltd | Hospitality | 2020 |
| Noor Cash & Carry Limited | Wholesale & retail | 2019 |
| Noor Diagnostics Limited | Health & social care | 2019 |
| Noor Grocer Limited | Other services | 2018 |
| Noor Imaging Limited | Health & social care | 2023 |
| Noor Investments Limited | Real estate | 2020 |
| NOOR98 Ltd | Wholesale & retail | 2024 |
| Norah Health Ltd | Information & communication | 2025 |
| Norcott Mckenna Bookkeeping Services Ltd | Professional & scientific | 2022 |
| Nordic Smiles Limited | Extraterritorial | 2023 |
| Norlan Technology Solutions Limited | Information & communication | 2026 |
| Norris Bank Maintenance Limited | Households | 1965 |
| North Acquisitions Ltd | Real estate | 2025 |
| North Cheshire Clinical Psychology Services Limited | Health & social care | 2016 |
| North City Developments Ltd | Construction | 2022 |
| North Devon Leisure Ltd | Agriculture & fishing | 2014 |
| North Down Centre Ltd | Administrative & support | 2025 |
| North Energy Grants Ltd | Construction | 2025 |
| North Lumb Farm Limited | Real estate | 2022 |
| North West Brick Cleaning Limited | Construction | 2022 |
| North West Mountain Bike Centre Limited | Wholesale & retail | 1990 |
| North West Pest Away UK Ltd | Agriculture & fishing | 2023 |
| Northbridgeassets Ltd | Wholesale & retail | 2026 |
| Northdown M Ltd | Administrative & support | 2026 |
| Northern Etchells Homes Limited | Real estate | 2010 |
| Northern Flooring Services Limited | Construction | 2022 |
| Northern Property Maintenance Ltd | Construction | 2007 |
| Northern Roofing (Cheshire) Limited | Construction | 2014 |
| Northfield Under 5'S Limited | Education | 2002 |
| Northline Electrical Services Limited | Construction | 2026 |
| Northpoint & Partners Ltd | Construction | 2025 |
| Northpoint Property Solutions Ltd | Real estate | 2019 |
| Northstate Solutions Limited | Professional & scientific | 1997 |
| Northwood Construction Ltd | Construction | 2020 |
| Nosho Ltd | Information & communication | 2025 |
| NOT4SALE Kitchen Ltd | Wholesale & retail | 2022 |
| Notabyte Limited | Wholesale & retail | 2020 |
| Noteland Property Management Limited | Households | 1982 |
| Novatec Marketing Limited | Professional & scientific | 2024 |