| Nestled Holdco Limited | Real estate | 2025 |
| Nestvibe Ltd | Real estate | 2025 |
| NET Zero Fleet Ltd | Administrative & support | 2023 |
| Nethercote Media Limited | Information & communication | 2007 |
| Network Solutions Consulting Ltd | Wholesale & retail | 2004 |
| Neuraltutor Limited | Information & communication | 2024 |
| Neutral Productions Ltd | Arts & recreation | 2021 |
| Neville Cressy Property Management Ltd | Real estate | 2026 |
| New AGE Glass Limited | Construction | 1998 |
| New ERA Floor Systems Limited | Wholesale & retail | 1994 |
| New Forest Containers Limited | Construction | 2023 |
| New Forest Plants Ltd | Wholesale & retail | 2004 |
| New Home Chichester Ltd | Construction | 2024 |
| New Lane Holdings Limited | Construction | 2020 |
| New Moon Inns Ltd | Hospitality | 2006 |
| New Park Community and Arts Association | Arts & recreation | 2005 |
| New Park Court Residents Association Limited | Households | 1981 |
| New Place Nurseries Limited | Administrative & support | 1986 |
| New Shoots Limited | Agriculture & fishing | 2018 |
| New Square Property Limited | Construction | 2018 |
| New Wave Project Management Ltd | Administrative & support | 2015 |
| New World Code Ltd | Professional & scientific | 2014 |
| Newbush Ltd | Other services | 2002 |
| Newey Limited | Agriculture & fishing | 1987 |
| Newport Residential Care Limited | Health & social care | 2011 |
| Newskilz Global Consulting Limited | Information & communication | 2023 |
| Newstart Loft Ltd | Hospitality | 2020 |
| Nexa Bristol Ltd | Real estate | 2018 |
| Nexa First Southern Region Limited | Real estate | 2017 |
| Nexa Holdings Ltd | Financial services | 2018 |
| Nexa London Ltd | Real estate | 2021 |
| Nexa Properties Ltd | Real estate | 2018 |
| Nexa South Wales Limited | Real estate | 2011 |
| Next GEN Coatings Limited Ltd | Professional & scientific | 2019 |
| Next Phase Entertainment Limited | Professional & scientific | 2025 |
| Nexus (G.B.) Limited | Wholesale & retail | 1990 |
| Nexus Digital Sales Ltd | Wholesale & retail | 2026 |
| Nexxus Corporation Limited | Construction | 1994 |
| Nexxus Group Limited | Professional & scientific | 1994 |
| NFP in Focus Limited | Professional & scientific | 2026 |
| NGS Studio Ltd | Wholesale & retail | 2021 |
| Ni-Smoke Ltd | Wholesale & retail | 2012 |
| Niah Limited | Real estate | 2023 |
| Nicholas North UK Ltd | Wholesale & retail | 2025 |
| Nicholas Plant Hire Limited | Other services | 1978 |
| Nick Ellis Upholstery Ltd | Manufacturing | 2024 |
| Nick Moore Software Ltd | Information & communication | 2020 |
| Nick Retail Ltd | Wholesale & retail | 2015 |
| Nick Rose Ltd | Wholesale & retail | 1993 |
| Nicki Paddy & Co Ltd | Professional & scientific | 2011 |
| Nicky Louth-Davies Limited | Professional & scientific | 2013 |
| Nicos Properties Limited | Professional & scientific | 2012 |
| Nigel Bauer & Associates Limited | Administrative & support | 2007 |
| Nightingale Mortgage Consultants Ltd | Financial services | 2010 |
| Niji Knives Ltd | Wholesale & retail | 2024 |
| Nilo International Ltd | Wholesale & retail | 2023 |
| Nimol Margate Limited | Professional & scientific | 2022 |
| Nine by Nine Golf Ltd | Wholesale & retail | 2024 |
| NINETEEN27 Limited | Professional & scientific | 2025 |
| Ninjamec Auto Services Ltd | Wholesale & retail | 2026 |
| Niscai Ltd | Information & communication | 2017 |
| Nitrous FS Limited | Administrative & support | 2023 |
| NJ Executive Ltd | Administrative & support | 2019 |
| NJ Harvey Estates Ltd | Real estate | 2025 |
| NJC Property Limited | Construction | 2024 |
| NJS Access Solutions Limited | Construction | 2017 |
| NJS Partnerships Limited | Construction | 2023 |
| NJS Roofing Limited | Construction | 2006 |
| NJS Roofing Maintenance Limited | Construction | 2023 |
| NJS Safe Deck Ltd | Construction | 2016 |
| NJS Scaffolding Limited | Construction | 2001 |
| NMP Lettings Ltd | Real estate | 2024 |
| NMR West Sussex Limited | Hospitality | 2022 |
| NO 89 Ltd | Manufacturing | 2026 |
| NO Mans Land Limited | Wholesale & retail | 1984 |
| Nocean Consulting Ltd | Professional & scientific | 2003 |
| Nodding Beam = Power Limited | Construction | 2025 |
| Noel's Gardening Services Limited | Construction | 2022 |
| Nomihold Ltd | Professional & scientific | 2024 |
| NON Stop Business Support Ltd | Information & communication | 2021 |
| Noone & Smith Property Limited | Real estate | 2026 |
| Nord Tuition Limited | Education | 2021 |
| Normandy Court Residents Association (Chichester) Limited | Real estate | 1996 |
| Norsan Limited | Wholesale & retail | 2018 |
| North Berks MCC Ltd | Administrative & support | 2023 |
| North Mundham Property Development Limited | Real estate | 2018 |
| North Oaks Management Company Limited | Households | 2023 |
| Northbrook Developments Ltd | Construction | 1994 |
| Northchurch Property Services Ltd | Real estate | 2021 |
| Northern Ikon Limited | Professional & scientific | 2002 |
| Northern Lettings Ltd | Real estate | 2019 |
| Northgate Asset Management Limited | Real estate | 2018 |
| Northgate PM Limited | Real estate | 2025 |
| Northgate Project Management LLP | | 2025 |
| Northgate Properties Ltd | Real estate | 2011 |
| Northgate Strategic Land Limited | Financial services | 2021 |
| Northstar:Dpi Ltd | Professional & scientific | 2011 |
| Northwood Business Park Limited | Other services | 2019 |
| Norton Bloom Limited | Financial services | 2025 |
| Norton Commercials Limited | Wholesale & retail | 2013 |