| New Vision Glazing Ltd | Construction | 2024 |
| Newbury Park Hotels Ltd | Hospitality | 2017 |
| Newmarket Dine Ltd | Hospitality | 2013 |
| Newns Markings Ltd | Construction | 2019 |
| Newton Byte Ltd | Information & communication | 2026 |
| Newton Rise Limited | Other services | 2025 |
| Next GEN Gaming Ltd | Professional & scientific | 2024 |
| Next Hire Recruitment Ltd | Administrative & support | 2025 |
| Next Horizon Education Ltd | Administrative & support | 2025 |
| Next Step Abroad Ltd | Education | 2025 |
| Next Steps Education, Training & Consultancy Ltd | Education | 2024 |
| Next UP Digital Solutions Limited | Wholesale & retail | 2025 |
| Nextgen Cyber Z41 Ltd | Information & communication | 2025 |
| Nextgen Dwelling Investments Ltd. | Real estate | 2024 |
| Nextpan Ltd | Construction | 2026 |
| Nexus Fortis Limited | Construction | 2025 |
| Nexus Operations Consulting Ltd | Professional & scientific | 2025 |
| Nield Trucking Limited | Transport & logistics | 2018 |
| Night & Day Logistics Limited | Transport & logistics | 2015 |
| Night Night Simpkins Limited | Real estate | 2025 |
| Niis Beauty Ltd | Other services | 2020 |
| Niko Distribution Ltd | Wholesale & retail | 2018 |
| Nili UK Ltd | Construction | 2021 |
| Nimrxh Limited | Professional & scientific | 2023 |
| NINETY5 Ltd | Information & communication | 2022 |
| NIS Market Limited | Transport & logistics | 2018 |
| Nishstone Limited | Professional & scientific | 2016 |
| Nissar Estates Ltd | Real estate | 2025 |
| Nistor Constructions Ltd | Construction | 2019 |
| Nixon HR Consulting Limited | Administrative & support | 2019 |
| NJC (Contracting) Limited | Extraterritorial | 2010 |
| NJI Transport Limited | Transport & logistics | 2006 |
| NK Creative Construction Limited | Construction | 2021 |
| NKT Trans Ltd | Transport & logistics | 2016 |
| NLC Engineering Services Limited | Construction | 2005 |
| NM Bignell & SON Ltd | Construction | 2016 |
| Nmba Limited | Transport & logistics | 2025 |
| NMK Media Ltd | Professional & scientific | 2025 |
| NMN Construction Ltd | Construction | 2024 |
| NMP Pharm Ltd | Health & social care | 2026 |
| NN Bazaar Limited | Wholesale & retail | 2025 |
| NO Limits European Track Days Limited | Arts & recreation | 2015 |
| NO Limits Holdings Limited | Financial services | 2022 |
| NO Limits Motorcycle Centre Limited | Wholesale & retail | 2015 |
| NO Limits Serious Tracktime Limited | Arts & recreation | 2010 |
| NO Limits Track Days Limited | Arts & recreation | 2003 |
| NO. 12 Coffee Shop Limited | Hospitality | 2023 |
| NO.12 Barbering Co. Ltd | Other services | 2022 |
| Nobby French Builders Limited | Construction | 2016 |
| Noble Drive Services Ltd | Transport & logistics | 2025 |
| Noble Enterprise Limited | Information & communication | 2026 |
| Noble EPC Ltd. | Health & social care | 2014 |
| Noblestrata Limited | Information & communication | 2024 |
| Noor Haulage Ltd | Transport & logistics | 2021 |
| Noor Transport Ltd Ltd | Transport & logistics | 2026 |
| Noori Brothers Limited | Wholesale & retail | 2013 |
| Nordson (U.K.) Limited | Wholesale & retail | 1972 |
| Noriasina Limited | Health & social care | 2022 |
| Northampton Car Sales Ltd | Wholesale & retail | 2022 |
| Northcotts Maintenance Company Limited | Real estate | 1972 |
| Northview Garage Services Limited | Manufacturing | 2007 |
| Norton House Residents Management Ltd | Households | 2019 |
| NOT My Base Ltd | Information & communication | 2015 |
| Novastead Limited | Real estate | 1993 |
| Nowuj Ltd | Information & communication | 2026 |
| NP Academy Ltd | Professional & scientific | 2025 |
| NPC Energy Solutions Ltd | Construction | 2025 |
| NPG Holdings Limited | Real estate | 2026 |
| NPK Napkins Limited | Manufacturing | 2008 |
| NPM Consultancy Services Limited | Information & communication | 2008 |
| NQA Certification Limited | Professional & scientific | 2014 |
| NRS Photo Ltd | Professional & scientific | 2022 |
| NS Homebuild Limited | Construction | 2022 |
| NSG Accountants Limited | Professional & scientific | 2022 |
| NSH Enterprises Limited | Professional & scientific | 2022 |
| Nspac Ltd | Education | 2025 |
| NT Paving Ltd | Construction | 2015 |
| NTK Flowers Ltd | Wholesale & retail | 2023 |
| Numerical Order Limited | Professional & scientific | 2002 |
| Nurses & Carers UK Ltd | Administrative & support | 2020 |
| Nutrisalt Ltd | Wholesale & retail | 2023 |
| Nvus IT Solutions Limited | Information & communication | 2010 |
| Nyiva Musau 2021 Limited | Real estate | 2021 |
| NYT Fast Solutions Ltd | Transport & logistics | 2018 |
| Oahomecarehc Ltd | Health & social care | 2019 |
| Oak & Stone Build Solutions Ltd | Construction | 2025 |
| Oak Street Limited | Hospitality | 2022 |
| Oaka Vending Mgws Ltd | Hospitality | 2026 |
| Oakcroft Properties Limited | Extraterritorial | 2000 |
| Oakham East Limited | Administrative & support | 2019 |
| Oakley Building Services Limited | Households | 2026 |
| Oakridge View Limited | Hospitality | 2025 |
| Oakstone Consulting Ltd | Construction | 2018 |
| Obcship Ltd | Transport & logistics | 2022 |
| Obex Associates Limited | Health & social care | 2007 |
| Obex Group Holdings Limited | Financial services | 2020 |
| Obex Group Limited | Financial services | 2016 |
| Obex Ninesprings Limited | Health & social care | 2025 |
| Obsidian Autocare Ltd | Manufacturing | 2022 |
| Obsidian Automotive Care Ltd | Manufacturing | 2022 |