| Newbold Property Limited | Real estate | 2025 |
| Newbold Solicitors Limited | Professional & scientific | 2023 |
| Newchapterproperty Ltd | Real estate | 2019 |
| Newport and District Group Training Limited | Education | 2025 |
| Newtown Motors (Cwmbran) Limited | Wholesale & retail | 1978 |
| Nexa IT Solutions Ltd | Information & communication | 2025 |
| Nexaallinone Ltd | Manufacturing | 2023 |
| Nexgen Carbon Zero Heating Ltd | Professional & scientific | 2021 |
| Nexgen Sports Holdings Ltd | Arts & recreation | 2020 |
| Next Day Passport Ltd | Administrative & support | 2025 |
| Nextera Commerce Ltd | Wholesale & retail | 2026 |
| Nexus Engineering Consultancy Ltd | Professional & scientific | 2025 |
| Nick Kenny Darts Limited | Arts & recreation | 2025 |
| Nicky Courtney Limited | Professional & scientific | 2013 |
| Nicolour Ltd | Wholesale & retail | 2024 |
| Niwas Estates Ltd | Real estate | 2024 |
| NJT Energy Solutions Ltd | Construction | 2021 |
| NO.6 the Salon Ltd | Other services | 2023 |
| NO7 Properties Ltd | Real estate | 2023 |
| Noizze Ltd | Wholesale & retail | 2018 |
| Nomads FRV CIC | Education | 2026 |
| Noodle Bar Ltd | Hospitality | 2026 |
| Nortech Control Systems Limited | Manufacturing | 1992 |
| Novaward Limited | | 1981 |
| NPT Waste Solutions Ltd | Water & waste | 2010 |
| Nu-Staff Limited | Administrative & support | 1993 |
| Numanlinks Limited | Wholesale & retail | 2025 |
| Nuvias UC Limited | Information & communication | 2009 |
| NXG Business Services Limited | Administrative & support | 2024 |
| O & H Tile Distributors Limited | Wholesale & retail | 2001 |
| O'Brien & Price (Stroud) Limited | Professional & scientific | 1998 |
| Oak & Grey Bathrooms Ltd | Wholesale & retail | 2024 |
| Oak Tree Motor Company Wales Limited | Wholesale & retail | 2006 |
| Oakfield Taste Limited | Hospitality | 2020 |
| Office Key Ltd. | Administrative & support | 2012 |
| Ohms Electrical Solutions Ltd | Construction | 2022 |
| Old Oak Landscaping & Driveways Ltd | Administrative & support | 2026 |
| Olerenshaw Home Improvements Services Limited | Construction | 2023 |
| One 2 One Mortgage Solutions Limited | Financial services | 2012 |
| ONE2ONE Estate Agents Ltd | Real estate | 2019 |
| ONE2ONE Wills & Estate Planning Limited | Professional & scientific | 2023 |
| Onederma Ltd | Professional & scientific | 2000 |
| Onions Aviation Ltd | Other services | 2019 |
| Only YOU Ltd | Administrative & support | 2016 |
| Onshore Offshore Safety Ltd | Construction | 2016 |
| Opheem Property Ltd | Real estate | 2021 |
| Orbology Ltd. | Manufacturing | 2025 |
| Osborne Estates 2 Ltd | Real estate | 2021 |
| Osborne Estates Limited | Real estate | 2016 |
| Osborne Sales & Lettings Ltd | Real estate | 2018 |
| Oscar Nails Ltd | Other services | 2025 |
| Osment Engineering Ltd | Professional & scientific | 2024 |
| Outdoor Innovations- Alan and Nicola Ltd | Construction | 2025 |
| P & a Grounds Maintenance Limited | Administrative & support | 2016 |
| P Gough Electrical Limited | Construction | 2007 |
| P M B Paint Sprayers Ltd | Construction | 2012 |
| P R S Garden Machinery Limited | Wholesale & retail | 2009 |
| P&G TM Services Ltd | Construction | 2025 |
| P&P Investment Properties Limited | Real estate | 2019 |
| PA Rebar Ltd | Construction | 2017 |
| Pace Coaching Limited | Other services | 2025 |
| Padstone Properties Limited | Real estate | 2019 |
| Pahilo Ventures Limited | Arts & recreation | 2021 |
| PAJ Formwork Limited | Manufacturing | 2018 |
| Palace Window Systems Limited | Construction | 1996 |
| Pamplemousse Property Ltd | Real estate | 2018 |
| Papad Consultancy Limited | Professional & scientific | 2025 |
| Paragon Logistics South West Limited | Transport & logistics | 2016 |
| Parker Bright Ltd | Real estate | 2025 |
| Parnell Media Ltd | Information & communication | 2021 |
| PAT and the Beanstalk Limited | Administrative & support | 2019 |
| Patna Limited | Agriculture & fishing | 2018 |
| Paws Grooming Academy Ltd | Education | 2020 |
| Paws in the Paddock Limited | Other services | 2025 |
| Paws-Ible Ltd | Other services | 2025 |
| PB Cleaning Solutions Ltd | Administrative & support | 2026 |
| PC Wannell Roofing and Cladding Specialists Ltd | Construction | 2026 |
| PD Fibre Solutions Ltd | Construction | 2024 |
| Pearce Investment Property Limited | Real estate | 2024 |
| Pearwood Developments Ltd | Construction | 2024 |
| Pearwood Group Ltd | Construction | 2024 |
| Pearwood Maintenance Ltd | Construction | 2024 |
| Pearwood Plant Ltd | Administrative & support | 2024 |
| Pearwood Projects Ltd | Construction | 2021 |
| Pedder Consultancy Limited | Information & communication | 2024 |
| Pegasus Europe Service Ltd | Transport & logistics | 2010 |
| Pegasus Trading Company Limited | Construction | 2026 |
| Pelle Groundworks Limited | Construction | 2024 |
| Pembroke House Limited | Real estate | 2013 |
| Pencoed Reinforcements Limited | Construction | 2004 |
| Pendragon (Design & Build) Limited | Construction | 1984 |
| Pendragon Fireworks & Pyrotechnics Limited | Arts & recreation | 2017 |
| Pengelly Property Investments Ltd | Real estate | 2025 |
| Penguin Places Limited | Real estate | 2026 |
| Penhurst Limited | Wholesale & retail | 2025 |
| Penknife Limited | Professional & scientific | 1980 |
| Pennyfred Ltd | Manufacturing | 2021 |
| Penrhiw Farm Organic Meat Limited | Wholesale & retail | 2007 |
| Pensaer Ltd | Professional & scientific | 2016 |
| Pentre Investments Limited | Real estate | 2025 |