| NMC (Noor Malang Construction) Ltd | Construction | 2024 |
| NMC General Services Ltd | Transport & logistics | 2018 |
| NMC Refinish Ltd | Wholesale & retail | 2023 |
| Nmhb Ltd | Other services | 2022 |
| NN Developments Ltd | Construction | 2020 |
| NN Hospitality Ltd | Hospitality | 2019 |
| NN Living Spaces Ltd | Real estate | 2025 |
| Nnics Limited | Real estate | 1998 |
| Nnkt Limited | Wholesale & retail | 2020 |
| NO 17 Limited | Professional & scientific | 2009 |
| NO Fear Limited | Other services | 2004 |
| NO Filter Aesthetics Clinic Ltd | Other services | 2024 |
| NO Sauce Ltd | Wholesale & retail | 2025 |
| NO Sauce Nation Ltd | Wholesale & retail | 2023 |
| NO.1 Kebab House Ltd | Hospitality | 2025 |
| NO.1 Pizza House Ltd | Hospitality | 2025 |
| NO11 Limited | Real estate | 2024 |
| Noah Digital Services Limited | Information & communication | 2025 |
| Nobis Furniture Limited | Wholesale & retail | 2010 |
| Nobis Trans Ltd | Transport & logistics | 2026 |
| Noble Cleaning Team Ltd | Administrative & support | 2025 |
| Noble Eater Ltd | Hospitality | 2023 |
| Nobleb Care Ltd | Health & social care | 2024 |
| Nobleroute Logistics Ltd | Transport & logistics | 2025 |
| Nobull International Limited | Manufacturing | 2018 |
| Noda Limited | Arts & recreation | 1929 |
| Noelyne Jones Ltd | Professional & scientific | 2010 |
| Nogrimeexteriors Ltd | Administrative & support | 2023 |
| Noisy Cricket Guitars Ltd | Manufacturing | 2025 |
| Noja Consulting Ltd | Information & communication | 2012 |
| Noja Property Services Limited | Real estate | 2014 |
| Nolan-Care Services Limited | Health & social care | 2020 |
| Nold Limited | Information & communication | 2024 |
| Nolukas Ltd | Transport & logistics | 2015 |
| Nolvic Care Services UK Ltd | Public administration | 2025 |
| Nomad & Nonna Ltd | Hospitality | 2026 |
| Nomad Camper Tech Ltd | Manufacturing | 2026 |
| Nomad Copywriting Ltd | Information & communication | 2023 |
| Nomad International Ltd | Transport & logistics | 2007 |
| Nomadic Carpets Limited | Wholesale & retail | 2024 |
| Nomadic Dog Limited | Professional & scientific | 2016 |
| Nominariat Limited | Administrative & support | 1970 |
| Nonstop Brands Ltd | Wholesale & retail | 2025 |
| Nonte Express Ltd | Transport & logistics | 2025 |
| Noor Blindz & Carpets Ltd | Construction | 2024 |
| Noor Grillhouse Ltd | Hospitality | 2024 |
| Noor NSB Ltd | Real estate | 2019 |
| Noori Travel and Tours Ltd | Administrative & support | 2006 |
| Noors Auto Storage Recovery Limited | Transport & logistics | 2016 |
| Noortaxi Limited | Transport & logistics | 2026 |
| Noortek Limited | Construction | 2021 |
| Nopa Trans Ltd | Transport & logistics | 2025 |
| Nora Debtco UK Limited | Financial services | 2024 |
| Norbi Zone Ltd | Transport & logistics | 2026 |
| Norby Transport Ltd | Transport & logistics | 2012 |
| Norcam Hydraulic Services Limited | Manufacturing | 2008 |
| Nord Chem Limited | Administrative & support | 1994 |
| Norda Healthcare Ltd | Health & social care | 2022 |
| Norde J Ltd | Transport & logistics | 2022 |
| Nordee Ltd | Wholesale & retail | 2023 |
| Nordic Cloud Ltd | Wholesale & retail | 2025 |
| Nordic MID Atlantic Group Ltd | Real estate | 2014 |
| Nordik Aesthetix Ltd | Health & social care | 2021 |
| Norfolk Coastal Developments Limited | Construction | 2021 |
| Norfolk Eco Limited | Construction | 2025 |
| Norfolk Scaffolding Limited | Construction | 2017 |
| Norposh Limited | Manufacturing | 2017 |
| Norr Collective Ltd | Professional & scientific | 2026 |
| Norris Hand Surgery Ltd | Health & social care | 2020 |
| North Coast Investments (UK) Limited | Real estate | 2017 |
| North END Investments Ltd | Construction | 2018 |
| North Luffenham Residents Company Limited | Households | 2001 |
| North Network Limited | Professional & scientific | 2004 |
| North Star Food Ingredients Ltd | Wholesale & retail | 2018 |
| North Star Foods Group Ltd | Professional & scientific | 2023 |
| North Star Foods Ltd | Wholesale & retail | 2015 |
| North Street Clinic Ltd | Health & social care | 2016 |
| North Street Healthcare Limited | Health & social care | 2014 |
| North West Steel Limited | Construction | 1988 |
| Northall Mews Flats Management Limited | Households | 1988 |
| Northam Pharma UK Ltd | Manufacturing | 2025 |
| Northborough Events Limited | Other services | 2024 |
| Northbridge Logistics Limited | Transport & logistics | 2025 |
| Northdown (NPS) Estates Ltd | Real estate | 2024 |
| Northdown Group (NPS) Ltd | Financial services | 2021 |
| Northdown Property Repair Services (Nprs) Ltd | Construction | 2024 |
| Northdown Property Services (NPS) Investments Ltd | Real estate | 2020 |
| Northdown Property Services (NPS) Ltd | Construction | 2015 |
| Northdown Restoration Services (NRS) Ltd | Construction | 2024 |
| Northern Renewable Energy Services Ltd | Manufacturing | 2014 |
| Northern Therapy Service Ltd | Other services | 2025 |
| Northfields Catering Limited | Hospitality | 2012 |
| Northwood Peterborough Ltd | Real estate | 2005 |
| Northwood Residents Company Limited | Households | 2011 |
| Norton Rickett Limited | Real estate | 2012 |
| Norty Competitions Ltd | Arts & recreation | 2024 |
| Norvexa-D Ltd | Construction | 2026 |
| Norwood Stores Limited | Wholesale & retail | 2026 |
| Nostalgia Foods Ltd | Wholesale & retail | 2022 |
| Nostra Caffe Limited | Hospitality | 2019 |