| OUR Vans Ltd | Manufacturing | 2021 |
| Outlet Wholesale Ltd | Wholesale & retail | 2017 |
| Outmore Copton Ltd | Wholesale & retail | 2025 |
| Owen & Sons Security Ltd | Administrative & support | 2026 |
| OZ Avon Limited | Hospitality | 2025 |
| P Haggerty & Co Holdings Ltd | Financial services | 2025 |
| P.A.P. Properties Ltd | Real estate | 1994 |
| P.D.P. (Maintenance Services) Limited | Construction | 1984 |
| Paddock Barker Ltd | Wholesale & retail | 2025 |
| Padel Vision Ltd | Arts & recreation | 2024 |
| Paget Bates Ltd | Wholesale & retail | 2025 |
| Pampered Parties Ltd | Arts & recreation | 2025 |
| Pancroft, Whiteman and Partners Consulting Limited | Wholesale & retail | 2005 |
| Panteg MOT Centre Ltd | Other services | 2020 |
| Panteg Vehicle Repairs Ltd | Wholesale & retail | 2020 |
| Pantysgawn Limited | Manufacturing | 2020 |
| Paragon Financial Consulting Ltd | Administrative & support | 2012 |
| Parc Limited | Wholesale & retail | 2003 |
| Parc Y Felin Management Company Limited | Households | 2007 |
| Parcelrun Limited | Transport & logistics | 2012 |
| Parfitt Developments LLP | | 2012 |
| Parfitt Financial Planning Limited | Financial services | 2014 |
| Parker Environmental Services Holdings Limited | Financial services | 2025 |
| Parker Environmental Services Limited | Construction | 1999 |
| Parker Nuclear Services UK Limited | Extraterritorial | 2011 |
| Parker-Hale Ventures Limited | Administrative & support | 2016 |
| Partee Time Mini Golf Ltd | Wholesale & retail | 2023 |
| Paul Powell ( Gwent ) Limited | Construction | 2009 |
| Paulton Filch Ltd | Wholesale & retail | 2025 |
| Paws R US by Clare Austin CYF | Other services | 2025 |
| PBS Wales Limited | Construction | 2007 |
| PCJ Auto Repairs Ltd | Wholesale & retail | 2025 |
| PE Site Solutions Ltd | Construction | 2019 |
| Peakes Coaches Limited | Transport & logistics | 2006 |
| Pendragon Property Limited | Real estate | 2023 |
| Penrhiw Management Company Limited | Real estate | 2011 |
| Penry Morgan(Blaenavon)Limited | Transport & logistics | 1965 |
| Pentwyn Splicers Limited | Professional & scientific | 2005 |
| Penyrheol Limited | Construction | 2023 |
| Perfect Balance Pilates - Pontypool Ltd | Arts & recreation | 2025 |
| Perfugulator Property Ltd | Real estate | 2021 |
| Peridot Property & Development Ltd | Real estate | 2025 |
| Peter John Rawcliffe Limited | Extraterritorial | 2024 |
| Peter Price Accountants Limited | Professional & scientific | 2016 |
| PH Innovate (Broking) Limited | Professional & scientific | 2018 |
| PH Innovate Group Limited | Professional & scientific | 2022 |
| PHH Limited | Wholesale & retail | 2017 |
| PHH Property Investments Ltd | Real estate | 2022 |
| Phillip Court FH Ltd | Households | 2021 |
| Phillips Autotech Limited | Manufacturing | 2026 |
| Phillips Mobile Units Wales Ltd | Administrative & support | 2022 |
| Phoenix Aircon Limited | Energy | 1989 |
| Phoenix Armoury Limited | Arts & recreation | 2023 |
| Phoenix Developments (Homes) Ltd | Construction | 2011 |
| Photo Cushions UK Ltd | Wholesale & retail | 2025 |
| Pier Stays Ltd | Real estate | 2021 |
| Pinch-A-Pound (UK) Limited | Real estate | 1993 |
| Planted MS Limited | Wholesale & retail | 2025 |
| Platinum Outsource Ltd | Administrative & support | 2018 |
| Platinum Outsourcing Paymaster Ltd | Administrative & support | 2019 |
| Playful Pooch Ltd | Wholesale & retail | 2024 |
| Plumbfit Online Ltd | Wholesale & retail | 2023 |
| Pocket Mariner Ltd. | Information & communication | 2013 |
| Polo Ground Commercial Repairs Ltd | Wholesale & retail | 2025 |
| Ponderosa BBQ Catering Ltd | Hospitality | 2024 |
| Ponty Star Limited | Hospitality | 2023 |
| Pontymoile Under Fives C.I.C. | Health & social care | 2019 |
| Pontypool and Blaenavon Railway Company (1983) Limited(The) | Transport & logistics | 1983 |
| Pontypool Automatics Ltd | Administrative & support | 2000 |
| Pontypool Development Trust | Professional & scientific | 2005 |
| Pontypool Electric Vehicles Ltd | Wholesale & retail | 2022 |
| Pontypool Golf Club Ltd | Arts & recreation | 2011 |
| Pontypool MOT Centre Limited | Wholesale & retail | 2010 |
| Pontypool Nail Salon Ltd | Other services | 2023 |
| Pontypool Spackle Cleaners Ltd | Administrative & support | 2025 |
| Pontypool Teeth Whitening Ltd | Other services | 2026 |
| Pontypool Tyre & Exhaust Centre Limited | Wholesale & retail | 2004 |
| Pontypool Valeting Services Ltd | Other services | 2018 |
| Pontypool Waste Disposal Limited | Water & waste | 2009 |
| Poppies Day Nursery Limited | Education | 2004 |
| POPPY6420 Ltd | Real estate | 2015 |
| Porky's Pizza Limited | Hospitality | 2025 |
| Portway Browns Ltd | Wholesale & retail | 2025 |
| Premier Properties (SW) Ltd | Administrative & support | 2016 |
| PRG Consult Limited | Professional & scientific | 2012 |
| Priddle Building Services Ltd | Construction | 2020 |
| Priddle Properties Ltd | Real estate | 2020 |
| Pro Cool Air Conditioning & Ventilation Limited | Manufacturing | 2018 |
| Pro Steel Engineering (Holdings) Ltd | Financial services | 2014 |
| Pro Steel Engineering Limited | Manufacturing | 2012 |
| Project Dome Ltd | Information & communication | 2011 |
| Prolx Limited | Administrative & support | 2019 |
| Proper Cleanse Ltd | Administrative & support | 2025 |
| Property Data Solutions Ltd | Professional & scientific | 2007 |
| Property Management (Newport) Limited | Construction | 1983 |
| PRV Engineering Limited | Manufacturing | 1986 |
| Pure Solutions Property Services Ltd | Extraterritorial | 2009 |
| PVQ Property Rental Limited | Real estate | 2014 |
| Qualmech Limited | Manufacturing | 1999 |
| Quayside Friars Ltd | Wholesale & retail | 2025 |