| NH Enterprise S66 Limited | Hospitality | 2025 |
| NH Lettings Ltd | Real estate | 2025 |
| NH34EA Teams Ltd | Real estate | 2026 |
| NIC Electrical Solutions Ltd | Administrative & support | 2016 |
| Nicacorals and Accessories Ltd | Manufacturing | 2025 |
| Nican Systems Ltd | Manufacturing | 2023 |
| Niceday Accountancy Ltd | Professional & scientific | 2012 |
| Nicheheatingsolutions Ltd | Construction | 2025 |
| Nicholas Alexander Holdings Ltd | Financial services | 2023 |
| Nicholas D Downing Limited | Health & social care | 2010 |
| Nicholas Distribution Limited | Transport & logistics | 2009 |
| Nichols Signs Limited | Manufacturing | 2001 |
| Nicholson Print (UK) Ltd | Administrative & support | 2011 |
| Nicholson Property Consultants Limited | Professional & scientific | 2016 |
| Nick Eagle Photography Ltd | Professional & scientific | 2021 |
| Nick Taylor (the Perfect Fit) Ltd | Construction | 2020 |
| Nickole Wilson Ltd | Professional & scientific | 2022 |
| Nico Car Wash Ltd | Wholesale & retail | 2022 |
| Nicols Convenient Stores Ltd | Wholesale & retail | 2019 |
| Nicols OFF Licence Ltd | Wholesale & retail | 2026 |
| Nightingale Lodge Holidays Ltd | Hospitality | 2022 |
| Nikken Kosakusho Europe Limited | Wholesale & retail | 1988 |
| Nikolaj Trans Limited | Transport & logistics | 2014 |
| Ninety Three Twenty Properties Ltd | Real estate | 2017 |
| Ninthlifefightwear Ltd | Wholesale & retail | 2026 |
| Nisha Studios Ltd | Arts & recreation | 2026 |
| Nistor Logistics Ltd | Transport & logistics | 2015 |
| Niuford Holdings Limited | Financial services | 2025 |
| Niuford Property Limited | Real estate | 2023 |
| Nivo Project Ltd | Construction | 2023 |
| NIW Consultants Ltd | Professional & scientific | 2025 |
| Nixon Sports Limited | Arts & recreation | 2022 |
| NJ Services Ltd | Transport & logistics | 2019 |
| NJB Window Fitters Ltd | Construction | 2014 |
| NJL Lettings Ltd | Real estate | 2024 |
| Njmleisure Ltd | Hospitality | 2025 |
| NJT Design Ltd | Manufacturing | 2022 |
| NJY Ltd | Construction | 2019 |
| Nkomo Nkomo Family Limited | Health & social care | 2014 |
| NL Brickwork Limited | Construction | 2023 |
| NL Fleet Serivces Ltd | Professional & scientific | 2025 |
| NLD Property Limited | Real estate | 2016 |
| NM Logistics Limited | Transport & logistics | 2018 |
| NMS Studios Ltd | Wholesale & retail | 2026 |
| NMT Limited | Real estate | 1998 |
| Nmtm Ltd | Construction | 2019 |
| NMW Properties Limited | Real estate | 2025 |
| NO Thumbs Climbing Ltd | Wholesale & retail | 2013 |
| NO12 Business Consultancy Ltd | Financial services | 2024 |
| NO18 Interiors Ltd | Wholesale & retail | 2018 |
| Noah Development Ltd | Real estate | 2020 |
| Noas Integrated Services Limited | Real estate | 2024 |
| Noble Care Holdings Ltd | Financial services | 2024 |
| Noble Farming Limited | Agriculture & fishing | 2003 |
| NOBLE4 Ltd | Hospitality | 2026 |
| Nobo Health Ltd | Wholesale & retail | 2025 |
| Nocturnal Interactive Limited | Information & communication | 2025 |
| Noonas Spa & Massage Limited | Health & social care | 2025 |
| Noor UL Huda Ltd | Other services | 2021 |
| Norbert RAK Health & Performance Ltd | Administrative & support | 2024 |
| Nordgras Ltd | Information & communication | 2023 |
| Nordstay Living Ltd | Real estate | 2026 |
| Norm Studio Ltd | Professional & scientific | 2026 |
| Norris Management Limited | Households | 2022 |
| Nortech Security Systems Limited | Administrative & support | 2002 |
| North Accounting Limited | Professional & scientific | 2011 |
| North American Highways Limited | Extraterritorial | 1995 |
| North Anston Healthcare Ltd | Wholesale & retail | 2026 |
| North Country Properties Limited | Real estate | 1988 |
| North Star Property Invest Ltd | Real estate | 2020 |
| North Yorkshire Haulage Ltd | Transport & logistics | 2026 |
| North Yorkshire Inns Ltd | Hospitality | 2025 |
| Northern Catering Butchers Limited | Manufacturing | 1988 |
| Northern Civils Plant Aggregates and Landscaping Limited | Construction | 2024 |
| Northern Edge Construction & Roofing Ltd | Construction | 2026 |
| Northern Entry Solutions Limited | Construction | 2022 |
| Northern FIX Ltd | Professional & scientific | 2019 |
| Northern Gateway Development Vehicle LLP | | 2019 |
| Northern Light Media Limited | Information & communication | 2003 |
| Northern Race & Drift CIC | Administrative & support | 2016 |
| Northside Garage Limited | Wholesale & retail | 2009 |
| Northview Garage MOT Centre Ltd | Wholesale & retail | 2024 |
| Northway Projects Limited | Administrative & support | 2024 |
| Northwich Biogas Limited | Administrative & support | 2015 |
| Northwich Biogas O&M Limited | Administrative & support | 2015 |
| Norton Finance and Mortgages Limited | Financial services | 2006 |
| Norton Finance Group Limited | Financial services | 2010 |
| Norton Financial Services Limited | Financial services | 1983 |
| Norton Home Loans Limited | Financial services | 1985 |
| Norverntek Limited | Information & communication | 2025 |
| Norwood MOT Centre Limited | Wholesale & retail | 2016 |
| Noshy@Theministry Ltd | Hospitality | 2024 |
| Noshys Lounge Ltd | Hospitality | 2021 |
| NOT Just Marketing Ltd | Real estate | 2024 |
| Notul Limited | Information & communication | 2016 |
| Nova Blade Ltd | Information & communication | 2021 |
| Nova Tax Ltd | Professional & scientific | 2023 |
| Novabuild Developments Ltd | Construction | 2026 |
| Novacity Ltd | Arts & recreation | 2014 |
| Novumtech Ltd | Administrative & support | 2013 |