| Niall Cars Ltd | Other services | 2005 |
| Nibble & Go Ltd | Hospitality | 2022 |
| NIC J Ltd | Other services | 2019 |
| Nice Building People Ltd | Construction | 2024 |
| Nice Glazing People Ltd | Construction | 2024 |
| Nice Property People Ltd | Real estate | 2025 |
| Niche Design and Build Limited | Construction | 2014 |
| Nick Harris Ltd | Manufacturing | 2020 |
| Nick Powell Photography Ltd | Professional & scientific | 2021 |
| Nick Stubbs Training and Consultancy Limited | Education | 2003 |
| Nicklin Carpentry Ltd | Manufacturing | 2021 |
| Nicola Miles Theatre Studios Limited | Arts & recreation | 2006 |
| Nicola Thompson Limited | Professional & scientific | 2013 |
| Nicolaisen Invest UK Ltd | Real estate | 2019 |
| Nifty Storage Ltd | Transport & logistics | 2024 |
| Nigel Moyler Ltd | Real estate | 2019 |
| Nigel Newman Consultancy Limited | Health & social care | 2021 |
| Nightingales Tenants Association CIC | Households | 2022 |
| Nightline Association | Other services | 2005 |
| Nightmare Entertainment LLP | | 2019 |
| Niksen Ltd | Wholesale & retail | 2007 |
| Nile Distribution Ltd | Transport & logistics | 2025 |
| Nimsi Staffing Ltd | Administrative & support | 2023 |
| Nineteenth Catering Limited | Hospitality | 2006 |
| Nire Ventures Limited | Hospitality | 2010 |
| Nismat Ltd | Financial services | 2019 |
| Nivalis Medical Communications Ltd | Information & communication | 2023 |
| Nizamoglu Chef Ltd | Hospitality | 2026 |
| NJ Portfolio Limited | Real estate | 2022 |
| NJP Kitchens Limited | Construction | 2020 |
| Njpeters Construction Limited | Construction | 2015 |
| NK Broadwater Mini Market Ltd | Wholesale & retail | 2019 |
| NL Industries Limited | Information & communication | 2016 |
| NL Windows and Doors Sussex Ltd | Construction | 2026 |
| NMW Estates Ltd | Real estate | 2023 |
| Nnbc Holdings Limited | Real estate | 2018 |
| NO Fold Media Ltd | Information & communication | 2018 |
| NO Limits Ltd | Wholesale & retail | 2007 |
| NO VAT Van Centre Ltd | Wholesale & retail | 2019 |
| NO. 19 Selborne Road, Hove Limited | Households | 1961 |
| NO. 22 Palmeira Square Limited | Households | 1997 |
| NO. 30 Pembroke Avenue (Management) Limited | Households | 1974 |
| NO. 7 Holdings Limited | Financial services | 2019 |
| NO. 73 Goring Limited | Real estate | 2024 |
| NO.15 Marine Parade (Management) Limited | Households | 1974 |
| NOA Assessments Limited | Health & social care | 2023 |
| Noble & Croft Limited | Real estate | 2020 |
| Noble Carpentry & Conversions Limited | Construction | 2020 |
| Noemi Ltd | Hospitality | 2017 |
| Nola's World Limited | Administrative & support | 2023 |
| NON Stop Gaming (Kent) Ltd | Arts & recreation | 2026 |
| NON Stop Gaming Ltd | Information & communication | 2020 |
| Nordell Holdings Limited | Financial services | 2013 |
| Nordell Limited | Manufacturing | 1994 |
| Nordell Properties Limited | Real estate | 2004 |
| Normandy Court (Freehold) Limited | Households | 2005 |
| NORSE3 Limited | Information & communication | 2025 |
| North Africa Properties,Limited | Extraterritorial | 1915 |
| North END Coliving Ltd | Real estate | 2021 |
| North House Management Limited | Real estate | 2015 |
| North Kent Engineering Limited | Professional & scientific | 2017 |
| North Laine Investments Ltd | Real estate | 2019 |
| North Pole Command Centre Limited | Information & communication | 2015 |
| North Rhodes Electrical Limited | Construction | 2017 |
| North Shore Risk Limited | Financial services | 2026 |
| Northbrook Road Business Park Limited | Real estate | 2004 |
| Northcourt House (Freehold) Company Limited | Extraterritorial | 2018 |
| Northern BEE Beauty Limited | Wholesale & retail | 2019 |
| Northern BEE Holdings Limited | Financial services | 2019 |
| Northern BEE Investments Limited | Wholesale & retail | 2019 |
| Northern BEE Social Limited | Information & communication | 2014 |
| Northern BOY Limited | Professional & scientific | 2004 |
| Northern Child Limited | Information & communication | 2024 |
| Northernlightsco Ltd | Administrative & support | 2022 |
| Northstar Energy Limited | Construction | 2006 |
| Norton Court Flats Management Company Limited | Real estate | 1965 |
| Norwich Court (Worthing) Limited | Real estate | 2006 |
| NOT Only Words Limited | Manufacturing | 2002 |
| Nota Bene Consulting Services Ltd | Information & communication | 2002 |
| Note Twenty Limited | Information & communication | 2025 |
| Nothing BUT Beauty Ltd | Other services | 2019 |
| Notifly Ltd | Information & communication | 2026 |
| Notwoways Limited | Wholesale & retail | 2020 |
| Nouvelle Coiffure Limited | Professional & scientific | 2000 |
| Nova Care Solutions Limited | Health & social care | 2023 |
| Novamere Leisure Limited | Real estate | 2019 |
| Novex Solutions Limited | Administrative & support | 2000 |
| Noviomagus Limited | Construction | 2019 |
| Noyce Global Representation Group Ltd | Professional & scientific | 2025 |
| NP Construction Services Ltd | Construction | 2019 |
| NP Dent Limited | Health & social care | 2023 |
| NP Services Ltd | Administrative & support | 2017 |
| NPH Bennett Building & Roofing Contractors Limited | Construction | 2023 |
| NPZ Entertainment Limited | Manufacturing | 2014 |
| NPZ Holdings Limited | Financial services | 2020 |
| NPZ Properties Ltd. | Real estate | 2016 |
| NRG Corporation Ltd | Professional & scientific | 2010 |
| NRG Fleet Polishing Limited | Wholesale & retail | 2026 |
| NRG Sussex Ltd | Construction | 2017 |
| Nrgfields Limited | Professional & scientific | 2013 |