| Naval Enterprise Limited | Wholesale & retail | 2023 |
| Nayyar Mughal Creative Ltd | Arts & recreation | 2018 |
| Ncooke Industries Ltd | Wholesale & retail | 2021 |
| Nepali Village UK Ltd | Other services | 2021 |
| Nerak Limited | Manufacturing | 2011 |
| Neuropsychology and Medico-Legal Consulting Ltd | Health & social care | 2025 |
| New Barn Developments Ltd | Real estate | 2018 |
| New Barn Trading Ltd | Professional & scientific | 2021 |
| New Build Cleaning Ltd | Administrative & support | 2025 |
| New Millennium Internet Services Limited | Information & communication | 1998 |
| Newton-By-Usk Limited | Agriculture & fishing | 2010 |
| Nextfriday Limited | Information & communication | 2012 |
| Nexus Stunt Rigging Limited | Arts & recreation | 2025 |
| Nia's Wish Consulting Ltd | Wholesale & retail | 2024 |
| Nick Howe Photography Limited | Professional & scientific | 2012 |
| NO12 Aesthetics Ltd | Health & social care | 2026 |
| Northcote Manor Hotel (Devon) Limited | Hospitality | 2016 |
| Nowmost Company Limited | Arts & recreation | 1994 |
| NSP Plumbing Services Ltd | Construction | 2020 |
| Nucleus Building Control Ltd | Professional & scientific | 2025 |
| Nucleus Compliance Group Ltd | Professional & scientific | 2025 |
| NV Trading Ltd | Wholesale & retail | 2025 |
| Nxtdev Advisors Ltd | Professional & scientific | 2026 |
| O10 Design Ltd | Professional & scientific | 2025 |
| Oak Meadow Hideaways Ltd | Construction | 2023 |
| Oakenhall Limited | Real estate | 1991 |
| Objective Furniture Limited | Manufacturing | 2019 |
| OC Welding & Fabrication Ltd | Construction | 2019 |
| OGO Oluwa Limited | Professional & scientific | 2023 |
| OJ Morgan Services Ltd | Professional & scientific | 2023 |
| OKG Properties Limited | Real estate | 2024 |
| Old Railway Line Garden Centre Limited | Wholesale & retail | 2006 |
| Old Railway Line Holdings Ltd | Financial services | 2019 |
| OMG Brecon Limited | Other services | 2014 |
| OMG Wimbledon Village Limited | Other services | 2014 |
| Omicron Limited | Other services | 1994 |
| Orca Stays Ltd | Hospitality | 2021 |
| Orca Will Writers Limited | Other services | 2019 |
| Oren Tree Surgeons Ltd | Agriculture & fishing | 2023 |
| Organic Masters Group Limited | Other services | 2009 |
| Orion Motors (Talgarth) Limited | Wholesale & retail | 2006 |
| Orion Motors Limited | Extraterritorial | 2021 |
| OTS Online Ltd | Wholesale & retail | 2023 |
| OUT of the Woods Limited | Professional & scientific | 2018 |
| Overborder Limited | Hospitality | 2025 |
| Oystermouth Properties Limited | Real estate | 2019 |
| P C Smart T/A Smarts Transport Ltd | Transport & logistics | 2009 |
| P Haydon Communications Limited | Other services | 2023 |
| Page Rural Advisory Limited | Real estate | 2023 |
| Paradise Cycles Limited | Wholesale & retail | 2013 |
| Parc Tarell Management Company Limited | Administrative & support | 2005 |
| Parish Mews Gilfach Management Company Limited | Households | 2023 |
| Past Perfect Limited | Information & communication | 1993 |
| Paul Dennis & SON Ltd | Manufacturing | 2017 |
| Paul Dennis Metalworks Limited | Manufacturing | 2011 |
| Paul Sherwood Electrical Contractor Limited | Construction | 2012 |
| Pave Property Limited | Real estate | 2017 |
| PAW Equities Partners Ltd | Financial services | 2024 |
| Pawb Labs Ltd | Professional & scientific | 2025 |
| Pdworks Design Ltd | Professional & scientific | 2022 |
| Peake Ecology Ltd | Other services | 2025 |
| Pearl Research and Strategy Ltd | Professional & scientific | 2018 |
| Pedestal Television Limited | Information & communication | 2003 |
| Peloton UK Holdings Ltd | Financial services | 2017 |
| PEN Cantref Residents Limited | Real estate | 2015 |
| Pencelli Castle Limited | Hospitality | 2022 |
| Pengelly Haulage Limited | Transport & logistics | 2012 |
| Penmaes Management Company Limited | Households | 2003 |
| Pennaf Management Ltd | Real estate | 2025 |
| Pennaf Property Ltd | Construction | 2023 |
| Penoyre Park Limited | Households | 2005 |
| Perfect Blend Holdings Ltd | Professional & scientific | 2008 |
| Peterstone Court Limited | Hospitality | 2003 |
| Pets in Peace Limited | Other services | 2012 |
| PGM & SEM Limited | Real estate | 2026 |
| Phil Davies Haulage Ltd | Transport & logistics | 2018 |
| Phil Williams Plumbing Limited | Construction | 2010 |
| Philippa Feltham-White Occupational Therapy Services Limited | Health & social care | 2014 |
| Philippa James Equine Physiotherapy Ltd | Professional & scientific | 2014 |
| Phoneline Limited | Information & communication | 2016 |
| Pinkey's Limited | Financial services | 1991 |
| Pitch Hill Properties Limited | Real estate | 2021 |
| Planet Good Earth CIC | Education | 2023 |
| Planning Jungle Limited | Professional & scientific | 2011 |
| PMW Travel Limited | Administrative & support | 2002 |
| Polar Electrical Limited | Energy | 2014 |
| Polestar Holidays Ltd | Real estate | 2022 |
| Polestar Ventures Limited | Information & communication | 2019 |
| Pool Farm Residents Association Ltd | Households | 2008 |
| Porth DWR Ltd | Real estate | 2024 |
| Power for Your Product Limited | Wholesale & retail | 2009 |
| Powys and Brecon Beacons National Park Environmental Records Centre Limited | Information & communication | 2000 |
| Powys Pressure Washing Services Limited | Administrative & support | 2025 |
| Powys Tree Services Limited | Administrative & support | 2003 |
| PP & JS Holdings Limited | Financial services | 2021 |
| PP & JS Property Ltd | Real estate | 2024 |
| Pragmatic Shift Ltd | Information & communication | 2018 |
| Premier Q Coatings Limited | Wholesale & retail | 2003 |
| Pricepoint Surveying Limited | Other services | 2024 |
| Project Engineering Limited | Professional & scientific | 2014 |