| New Home Quality Inspections Limited | Extraterritorial | 2023 |
| New Spring Vista CIC | Agriculture & fishing | 2025 |
| Newton Brook Caravan Camping & Storage Ltd | Hospitality | 2013 |
| Next Space Properties Ltd | Real estate | 2025 |
| Nhqi Ltd | Extraterritorial | 2023 |
| Nicholas LEE Architects Limited | Professional & scientific | 2016 |
| Nigel Coles Photography Limited | Professional & scientific | 2005 |
| Nigel Coles School Photography Limited | Professional & scientific | 2006 |
| Nigel T North Limited | Health & social care | 2005 |
| Nightingale Care at Home Ltd | Public administration | 2023 |
| Nikmer | Professional & scientific | 2025 |
| Nipin Limited | Arts & recreation | 2025 |
| Nixey Powell Partnership Limited | Professional & scientific | 2008 |
| Nizdos Limited | Manufacturing | 1995 |
| NM BC Consulting Ltd | Information & communication | 2025 |
| No.Ble Skincare Ltd | Manufacturing | 2026 |
| Nomis Yeldems Limited | Professional & scientific | 2015 |
| Nonplus Records Limited | Information & communication | 2009 |
| Nordic Accounting Limited | Professional & scientific | 2023 |
| North Road Property Limited | Real estate | 2025 |
| Norton Electrical Wholesale Supplies Limited | Wholesale & retail | 1997 |
| Norton Garden Machinery Limited | Wholesale & retail | 2003 |
| Norton Masonry Limited | Construction | 1999 |
| Norton Nails and Beauty 84 Ltd | Other services | 2023 |
| Norton Scaffold Ltd | Construction | 2009 |
| Norton Service Station Limited | Wholesale & retail | 2012 |
| Norton Spice Limited | Hospitality | 2023 |
| Norwood Property Management Limited | Real estate | 2013 |
| Nought Marketing Limited | Professional & scientific | 2024 |
| Nova Mail Limited | Transport & logistics | 2024 |
| NS Groundscapes Ltd | Construction | 2024 |
| NT Creative Arts Ltd | Arts & recreation | 2011 |
| Number One Electrical Limited | Construction | 2018 |
| Number One Kebab Ltd | Hospitality | 2024 |
| Nurture.Orguk Limited | Health & social care | 2025 |
| O. N Candy Trailer & Machinery Sales Ltd | Wholesale & retail | 2021 |
| Oakhill Chapel Limited | Wholesale & retail | 2011 |
| Oakville Care Centre Limited | Wholesale & retail | 2010 |
| Objective Holdings Limited | Financial services | 2019 |
| Obsidian Cheer and Dance Ltd | Education | 2025 |
| Oche Boss Darts Ltd | Wholesale & retail | 2026 |
| Offtrak Ltd | Professional & scientific | 2014 |
| Ogden Brooks Ltd | Arts & recreation | 2018 |
| Oils & Coils Ltd | Wholesale & retail | 2017 |
| Old Meadow Properties Limited | Construction | 2003 |
| Old Printworks Arts C.I.C. | Arts & recreation | 2023 |
| Ollie Booth Design Ltd | Professional & scientific | 2017 |
| Olveston Homes Limited | Real estate | 2020 |
| Opal PM Solutions Ltd | Information & communication | 2021 |
| Opies Construction Limited | Construction | 2024 |
| Optis Optical Ltd | Professional & scientific | 2014 |
| Orbital Edge Consulting Limited | Professional & scientific | 2026 |
| Orchard Woodwork Ltd | Manufacturing | 2016 |
| Oriental Sunrise Radstock Limited | Hospitality | 2016 |
| Ossia Office Limited | Administrative & support | 2013 |
| Osteopathic Services to Racing Limited | Professional & scientific | 2009 |
| OT360 Ltd | Health & social care | 2021 |
| Otter Digital Limited | Information & communication | 2018 |
| Oval Commercial and Residential Investments Ltd | Administrative & support | 2024 |
| Oval Commercial Investments Limited | Hospitality | 2008 |
| Oval Estates (Bath) Limited | Construction | 1995 |
| Oval Estates (Frome) Limited | Construction | 2014 |
| Oval Estates (Radstock) Limited | Construction | 2013 |
| Oval Estates (Rosedale) Limited | Construction | 2013 |
| Oval Estates (ST Peter's) Limited | Construction | 2016 |
| Oval Estates (Valley Ridge) Limited | Construction | 2023 |
| Oval Estates (Wayland Gate) Ltd | Construction | 2011 |
| Oval Homes Holdings Limited | Real estate | 2026 |
| Oval Investment Properties Limited | Real estate | 2006 |
| Oxford New Energy Ltd | Energy | 2020 |
| P & J Showers Ltd | Construction | 2010 |
| P D Bilder Building Services Ltd | Construction | 2003 |
| P Dearden Telecommunications Limited | Professional & scientific | 2007 |
| P E M Trading Limited | Construction | 2012 |
| P H Gates and Fabrications Limited | Manufacturing | 2023 |
| P S L Events Limited | Administrative & support | 2022 |
| P.J. Light Properties Ltd | Real estate | 2024 |
| PA Fisher Ventures Ltd | Professional & scientific | 2026 |
| Paddock Homes Limited | Construction | 2014 |
| Paget Hartley Ltd | Real estate | 2019 |
| Palante Limited | Information & communication | 2022 |
| Papa Dels Limited | Hospitality | 2010 |
| Paper Face Limited | Information & communication | 2025 |
| Parc Skate School C.I.C. | Education | 2022 |
| Parcar Sales Ltd | Wholesale & retail | 2023 |
| Pareto Optima Limited | Professional & scientific | 2023 |
| Parfitt Removals Limited | Transport & logistics | 2002 |
| Parfitt Transport Limited | Transport & logistics | 2010 |
| Parham Properties Ltd | Real estate | 2023 |
| Park House Properties Limited | Real estate | 2019 |
| Park Wood (Solar Power) Limited | Energy | 2011 |
| Parkfields Orchard Property Company Limited | Households | 2019 |
| Parkross Limited | Construction | 1998 |
| Partnership House Telford Limited | Real estate | 2019 |
| Patrick Beck Limited | Other services | 2018 |
| Paul Gunstone Mechanical Services Limited | Wholesale & retail | 2014 |
| Paul Hussey Limited | Energy | 2012 |
| Paulton Podiatry Limited | Health & social care | 2008 |
| Pawprintsandco Ltd | Arts & recreation | 2022 |
| Peacock Public Relations Limited | Professional & scientific | 2012 |