| NK Traders Parts Ltd | Wholesale & retail | 2026 |
| NN Nutrition Ltd | Wholesale & retail | 2021 |
| NO Campaign Limited | Extraterritorial | 2010 |
| NO Limitz Trampoline Park Ltd | Arts & recreation | 2016 |
| NO Nonsense Inc Ltd | Wholesale & retail | 2020 |
| NO Nonsense Products & Services Ltd | Administrative & support | 1999 |
| NO Sheet London Limited | Financial services | 2021 |
| NO Sheet Music Limited | Information & communication | 2012 |
| NO. 505 Cafe Bar Limited | Hospitality | 2022 |
| Noah Construct Concept Limited | Construction | 2021 |
| Noah's ARK Nursery (Redditch) C.I.C. | Education | 1999 |
| Noble Business Consulting Ltd | Professional & scientific | 2011 |
| Noble Properties Croyde Ltd | Hospitality | 2017 |
| Nocando Ltd | Wholesale & retail | 2016 |
| Noirit Limited | Extraterritorial | 1954 |
| Nomad Coffee Redditch Limited | Hospitality | 2026 |
| Nomad Coffee Worcester Limited | Hospitality | 2026 |
| Nonch (Holdings) Ltd | Professional & scientific | 2018 |
| Nonch Ltd | Professional & scientific | 2010 |
| Noon Music Collective Limited | Arts & recreation | 2026 |
| Nooyu Nutrition Limited | Health & social care | 2020 |
| Norgrove Studios Limited | Administrative & support | 1999 |
| Norman Properties (Midlands) Limited | Real estate | 2025 |
| North Cotswold Machine Tools Limited | Manufacturing | 1980 |
| North Drayton Solar Limited | Energy | 2025 |
| North East Worcestershire College Enterprises Limited | Education | 1992 |
| North Shore Business Solutions Limited | Professional & scientific | 2011 |
| Northern Tiger Property Empire Limited | Real estate | 2023 |
| Norton Parkway Business Park Limited | Construction | 2018 |
| Norton Parkway Developments Ltd | Construction | 2010 |
| Novamatrix Ltd | Hospitality | 2026 |
| Novo Kitchens and Bathrooms Limited | Wholesale & retail | 2020 |
| Novus Brands Ltd | Wholesale & retail | 2009 |
| Novus Training Limited | Professional & scientific | 2023 |
| Nowseen Limited | Wholesale & retail | 2023 |
| NP Corporate Solutions Limited | Administrative & support | 2025 |
| Nron Ltd | Real estate | 2019 |
| Nrrr Properties Limited | Real estate | 2024 |
| NRRR1 Properties Limited | Construction | 2026 |
| Nunn’S on the Run Ltd | Administrative & support | 2023 |
| Nutrahealth (UK) Limited | Extraterritorial | 2004 |
| NW Autocentres Limited | Professional & scientific | 1993 |
| NXT Generation (Midlands) Limited | Wholesale & retail | 2014 |
| Nyth Dryw Ltd | Real estate | 2025 |
| Nyumba Works Limited | Real estate | 2025 |
| O&C Trading Limited | Wholesale & retail | 2024 |
| O.J. Roofing Ltd. | Construction | 2012 |
| O.L.M Property Investment Midlands Ltd | Real estate | 2022 |
| Oak House Apartments Management Limited | Households | 2017 |
| Oak Leaf Electrical Services Limited | Construction | 2024 |
| Oakenfield Court Limited | Real estate | 1982 |
| Oakenshaw Property Investments Ltd | Real estate | 2026 |
| Oakey Estates Ltd | Real estate | 2024 |
| Oakhurst Construction Ltd | Construction | 2023 |
| Oakland & QSL Foodservice Solution Limited | Transport & logistics | 2024 |
| Oakland Distribution Limited | Transport & logistics | 2009 |
| Oakland Environmental Limited | Administrative & support | 2011 |
| Oakland Food Service Holdco Ltd | Professional & scientific | 2024 |
| Oakland Health Limited | Wholesale & retail | 2020 |
| Oakland International Group Ltd | Financial services | 2019 |
| Oakland International Limited | Transport & logistics | 1998 |
| Oaklands Court Management Company Limited | Hospitality | 1995 |
| Oakley 5000 Limited | Real estate | 2013 |
| Oakly Plates Ltd | Manufacturing | 2024 |
| Oakly Road Management Company Limited | Households | 1989 |
| Oakmar Homes Limited | Administrative & support | 2018 |
| Oakra Fulfilment Services Limited | Administrative & support | 2021 |
| Oaks Properties and Investments Limited | Financial services | 2026 |
| Oakside Property Limited | Real estate | 1997 |
| Oakstead Management Limited | Households | 2018 |
| Oakstead Properties Limited | Real estate | 2001 |
| Obsidian Collective Ltd | Professional & scientific | 2026 |
| Obsidian Dynamics Limited | Wholesale & retail | 2025 |
| Obsidian International Ltd | Professional & scientific | 2025 |
| Obsidian RX Ltd | Professional & scientific | 2025 |
| Obsidian TX Ltd | Professional & scientific | 2026 |
| Oceans Blue Limited | Information & communication | 2003 |
| Ocre Ltd | Real estate | 2020 |
| Odin's Fitness Ltd | Arts & recreation | 2023 |
| Odin's Hall Ltd | Hospitality | 2023 |
| OEM Mounts Limited | Wholesale & retail | 2021 |
| Ofege Pharm Ltd | Wholesale & retail | 2015 |
| Official Define Ltd | Wholesale & retail | 2025 |
| Offourpeg Ltd | Administrative & support | 2022 |
| Offshore Performance Apparel Ltd | Wholesale & retail | 2020 |
| OIG Holdco Limited | Financial services | 2021 |
| OJW Associates Services Ltd | Professional & scientific | 2022 |
| Oker Recruitment Ltd | Administrative & support | 2026 |
| Old Bell Farm Dog Groomers Limited | Other services | 2021 |
| Old Forge Management Company Limited | Real estate | 1988 |
| Old Friends Care Limited | Administrative & support | 2003 |
| Olde Barn Holdings Limited | Real estate | 2024 |
| Ollie Read Personal Training Ltd | Arts & recreation | 2023 |
| Omega Design Detail Limited | Information & communication | 2024 |
| Omega Detail Ltd | Administrative & support | 2023 |
| Omega Galactic Holdings II Limited | Financial services | 2021 |
| Omega Galactic Holdings III Limited | Financial services | 2021 |
| Omega Galactic Holdings Limited | Financial services | 2021 |
| Omega International Trust Limited | Extraterritorial | 2021 |
| Omega International Unit 1 Trading Limited | Extraterritorial | 2020 |