| NKW Commerce Limited | Wholesale & retail | 2024 |
| NL Fire Limited | Construction | 2025 |
| NL Fire Protection Ltd | Construction | 2018 |
| NL Resources Limited | Financial services | 2023 |
| NM Electrical Services Limited | Construction | 2023 |
| Nmpy Lincoln Properties Ltd | Real estate | 2016 |
| Nnoodoc Limited | Administrative & support | 2024 |
| NO Shelf Control Ltd | Wholesale & retail | 2024 |
| NO.4 Chapel ST, ST Ives Ltd | Wholesale & retail | 2022 |
| Noakes Accounting Limited | Professional & scientific | 2016 |
| Noakes Trading & Investments Ltd | Financial services | 2026 |
| Nobell Support Ltd | Administrative & support | 2019 |
| Noble CAD Limited | Wholesale & retail | 2023 |
| Nobrega Taunton Limited | Hospitality | 2019 |
| Noema Health Ltd | Health & social care | 2023 |
| Noova Cart Ltd | Wholesale & retail | 2025 |
| Norbsa Limited | Manufacturing | 2011 |
| Nordic Power Gym Ltd | Arts & recreation | 2021 |
| Nordic Tracks Ltd | Financial services | 2024 |
| Norfolk House RTM Company Limited | Real estate | 2006 |
| Norman Properties Limited | Financial services | 2020 |
| Normandy Windows Limited | Construction | 1999 |
| Norse Customs Limited | Wholesale & retail | 2019 |
| North Bradon Stud Limited | Agriculture & fishing | 2013 |
| North Cross Road Limited | Real estate | 2024 |
| North Curry Sport Limited | Arts & recreation | 2009 |
| Northam Farm Caravan Sales Limited | Wholesale & retail | 1999 |
| Northbrook Contractors Limited | Construction | 2003 |
| Northern Hydrogen Ltd | Energy | 2020 |
| Northfield Vets Limited | Professional & scientific | 2025 |
| Norton Brook Nursery Ltd | Wholesale & retail | 2019 |
| Norton Motor Company (Taunton) Limited | Extraterritorial | 1997 |
| Norvento Energy UK Limited | Energy | 2012 |
| Norwich Court Management (Taunton) Limited | Households | 1977 |
| Notably Limited | Professional & scientific | 2022 |
| Notaro Facial Aesthetics Limited | Health & social care | 2020 |
| Note-Orious Music Ltd | Wholesale & retail | 2015 |
| Noval Care Limited | Administrative & support | 2018 |
| Novatri Group Ltd | Wholesale & retail | 2025 |
| Novello (Burnham-On-Sea) Management Company Limited | Households | 2018 |
| Novum Consulting Ltd | Professional & scientific | 2021 |
| Novus Generation Limited | Professional & scientific | 2010 |
| Nozzleman Limited | Wholesale & retail | 2020 |
| Nprst Ltd | Real estate | 2018 |
| Nrag Limited | Professional & scientific | 2021 |
| Nrag Properties Ltd | Real estate | 2024 |
| Nrdik Ltd | Wholesale & retail | 2021 |
| NRG 4U Ltd | Construction | 2020 |
| NRS Griffiths Ltd | Construction | 2017 |
| Nrsh Collective Ltd | Professional & scientific | 2026 |
| NSG Engineering Ltd | Professional & scientific | 2022 |
| Nsherlock Limited | Professional & scientific | 2017 |
| NSJ Specialists Ltd | Construction | 2015 |
| Nswf Ltd | Professional & scientific | 2016 |
| NU Independent Wholesalers Ltd | Wholesale & retail | 2019 |
| Nuffield International Farming Scholarships | Education | 2016 |
| Nugg Crunch & Zigg Ltd | Construction | 2025 |
| Number 5 Dampiet Street Bridgwater Management Company Limited | Real estate | 2020 |
| Number Two Barnpark Terrace Tenants Limited | Households | 1989 |
| Nunnington Wood Ltd | Agriculture & fishing | 2024 |
| Nuovo Stone & Floor Limited | Construction | 2026 |
| Nupipe Group Limited | Construction | 2021 |
| NUT and Bolt Garage Services Ltd | Wholesale & retail | 2013 |
| Nutgrove Holdings Limited | Financial services | 2023 |
| Nutrinests Ltd | Manufacturing | 2025 |
| Nutritional Edge Ltd | Manufacturing | 2021 |
| NV International Capital Limited | Professional & scientific | 2006 |
| Nwse Operations Limited | Professional & scientific | 2020 |
| Nypd Homeshield Limited | Extraterritorial | 2012 |
| Nythe Farm Kitchen Limited | Manufacturing | 2003 |
| O M Hines Limited | Construction | 2017 |
| O P Hoddinott and Sons Limited | Agriculture & fishing | 2007 |
| O YES Pizza & Takeawy Ltd | Hospitality | 2024 |
| O&Sons Enterprise Limited | Wholesale & retail | 2024 |
| O'Brien Investments Ltd | Professional & scientific | 2013 |
| O'Keefes Cleaning Services (Devon) Limited | Administrative & support | 2009 |
| O'Pyzer Ltd | Agriculture & fishing | 2024 |
| O365 SME Ltd | Information & communication | 2018 |
| Oak Bank Residential Home Limited | Health & social care | 2005 |
| Oak House MGT. Company (108 Cheddon RD) Ltd | Real estate | 2018 |
| Oak Tree Place Investments Limited | Real estate | 2001 |
| Oak Veterinary Services Limited | Real estate | 2019 |
| Oakbridge Property Investment Management Limited | Real estate | 2020 |
| Oake Manor Golf Club Limited | Arts & recreation | 1992 |
| Oakford Archaeology Limited | Professional & scientific | 2015 |
| Oakforge Studios Ltd | Information & communication | 2025 |
| Oaklands Studios Limited | Information & communication | 2009 |
| Oakleaf Building Limited | Construction | 2015 |
| Oakleaf Commemorative Furniture Limited | Manufacturing | 2012 |
| Oakleigh Plumbing & Heating Limited | Construction | 2014 |
| Oaknest Ltd | Real estate | 2001 |
| Oakway Property Group Limited | Real estate | 2026 |
| Oakwood Driveways Ltd | Construction | 2019 |
| Oakwood New Homes Limited | Construction | 2003 |
| Oakwood Realisation Limited | Construction | 2003 |
| Oasis (UK) Technical Services Limited | Information & communication | 2001 |
| Oasis Biofuels Limited | Professional & scientific | 2025 |
| OASIS24 Ltd | Health & social care | 2025 |
| OBN Global Limited | Information & communication | 2017 |
| OBN IP Limited | Information & communication | 2023 |