| Naturally Organic Wholefoods Ltd | Wholesale & retail | 2020 |
| Naughton Contracts Limited | Construction | 2019 |
| Naughton Plant Hire Limited | Administrative & support | 2023 |
| Navanest Ltd | Real estate | 2025 |
| Navchart Commodities Ltd | Extraterritorial | 2008 |
| Navgold Limited | Wholesale & retail | 2004 |
| Navo Construction Ltd | Construction | 2026 |
| Nawaab Properties Limited | Real estate | 2019 |
| Nazmala Ltd | Wholesale & retail | 2025 |
| NCD Haulage Ltd | Transport & logistics | 2016 |
| Ncsf Ltd | Construction | 2025 |
| Ndoni Building Services Ltd | Construction | 2018 |
| NDS Investments Limited | Professional & scientific | 2003 |
| NE Quid Nimis Ltd | Professional & scientific | 2014 |
| Nearly New Sale Ltd | Wholesale & retail | 2023 |
| Neat Zone Cleaning Ltd | Administrative & support | 2026 |
| Nebula Game Studio Ltd | Information & communication | 2022 |
| Nede Constructions Ltd | Construction | 2019 |
| Neelkanth Trading Limited | Wholesale & retail | 2022 |
| Neesee Ltd | Manufacturing | 2022 |
| Nelgad Ltd | Health & social care | 2019 |
| Nella’S Kitchen Ltd | Hospitality | 2025 |
| Neonest Properties Limited | Real estate | 2022 |
| Neptune Consultancy Ltd | Education | 2014 |
| Nest & Castle Estates Limited | Real estate | 2019 |
| Nest and Castle Estates (Liverpool) Ltd | Real estate | 2020 |
| Netcommdesign Ltd | Information & communication | 2008 |
| Netsec Investments Limited | Real estate | 2017 |
| Newelldevelopments Ltd | Construction | 2025 |
| Newhaven Management Company (Stevenage) Limited | Real estate | 2014 |
| Newline Logic Limited | Construction | 2016 |
| Newman Labelling Limited | Manufacturing | 2019 |
| Nexon AI Ltd | Information & communication | 2025 |
| Next Generation Amida Beckenham Limited | Arts & recreation | 1998 |
| Next Generation Amida Fleet Limited | Professional & scientific | 2000 |
| Next Generation Amida Hampton Limited | Arts & recreation | 1997 |
| Next Generation Amida Services Limited | Professional & scientific | 1999 |
| Next Generation Clubs Limited | Arts & recreation | 1996 |
| Next Wavy Innovations Limited | Wholesale & retail | 2025 |
| Nextgen Limited | Professional & scientific | 1998 |
| NG Pro Limited | Construction | 2021 |
| NGA Systems Limited | Professional & scientific | 2006 |
| Ngaka Ltd | Health & social care | 2012 |
| Nhrt Limited | Agriculture & fishing | 2005 |
| Nice PI Ltd | Construction | 2024 |
| Nicholsons (Hatfield) Limited | Professional & scientific | 2020 |
| Nick Adams Racing Limited | Professional & scientific | 2020 |
| Nick Lofthouse and Associates Ltd | Financial services | 2018 |
| Night OWL Apartments Limited | Hospitality | 2020 |
| NIK & Sons Ltd | Construction | 2019 |
| NIK Patel Limited | Health & social care | 2007 |
| Niksa Properties Limited | Real estate | 2018 |
| Nilev Ltd | Transport & logistics | 2024 |
| Nimbus Fintech Ltd | Information & communication | 2018 |
| Nimz Consulting Limited | Information & communication | 2025 |
| Nirmanlok Ltd | Construction | 2025 |
| Nishtech Limited | Professional & scientific | 2015 |
| Njep Ltd | Wholesale & retail | 2025 |
| Nkoza Ltd | Transport & logistics | 2026 |
| NO.1 Grosvenor Gardens Management Company Limited | Households | 1997 |
| NOA Data Limited | Information & communication | 2013 |
| Noble Building Solutions Limited | Construction | 2025 |
| Noble Support Services Ltd | Health & social care | 2019 |
| Noblex Chauffeur Ltd | Transport & logistics | 2026 |
| Noonan & Mcandrews Consultants Ltd | Professional & scientific | 2016 |
| North Gate Constructions Ltd | Construction | 2018 |
| North London Maintenance Services Ltd | Manufacturing | 2026 |
| North Mart Ltd | Wholesale & retail | 2025 |
| North Mymms Park Ltd | Hospitality | 2017 |
| North Oak Carpentry Ltd | Manufacturing | 2025 |
| Northstar Environmental Solutions Ltd | Construction | 2013 |
| Nottingham Racquets & Healthtrack Limited | Professional & scientific | 1995 |
| Novascope Ltd | Professional & scientific | 2024 |
| Novo Print Limited | Manufacturing | 2016 |
| Novo-Height Properties Ltd | Real estate | 2019 |
| NPR Flat Roofing Limited | Construction | 2014 |
| NR Larne Limited | Financial services | 2021 |
| Nstar Group Ltd | Professional & scientific | 2022 |
| NTH Collective Limited | Wholesale & retail | 2021 |
| NU LUX Developments Limited | Real estate | 2018 |
| Number 8 Holding Limited | Professional & scientific | 2026 |
| Numbra Ltd | Information & communication | 2012 |
| Nursery Gardens (Chipperfield) Management Limited | Households | 2022 |
| Nursing Care Personnel Ltd | Health & social care | 2019 |
| Nurtured Abilities Ltd | Health & social care | 2023 |
| Nutri Nest Retail Ltd | Wholesale & retail | 2025 |
| Nutyre UK Ltd | Wholesale & retail | 2023 |
| Nuvo Mechanical Limited | Construction | 2018 |
| Nuw-You Nutrition Ltd | Health & social care | 2021 |
| Nyla Wellness Studio Limited | Arts & recreation | 2026 |
| O J Barker Limited | Real estate | 2015 |
| O'Connor PA Services Limited | Administrative & support | 2015 |
| O'Hara Bros. Aggregates Ltd | Transport & logistics | 1979 |
| Oaac City AI & Robotics Tech Limited | Manufacturing | 2025 |
| Oak Cottage Care Limited | Health & social care | 2004 |
| Oak Lane (Blocks C D E F & G) Flat Management Company Limited | Households | 1995 |
| Oak Tree Court (Freehold) Limited | Households | 2019 |
| Oak Tree Court Garages Freehold Limited | Extraterritorial | 2005 |
| Oakers Hill Limited | Financial services | 2022 |
| Oakgood Limited | Construction | 2024 |