| Peter J.Perkins & Co.Limited | Agriculture & fishing | 1958 |
| Peter PLS Ltd | Transport & logistics | 2015 |
| Peter Secota Ltd | Wholesale & retail | 2015 |
| Peter Watson Jones Limited | Agriculture & fishing | 1961 |
| Petersegs Limited | Professional & scientific | 2015 |
| Petro Twenty One Ltd | Real estate | 2024 |
| Petrum Consulting Ltd | Professional & scientific | 2018 |
| Petrus Wealth Consulting Limited | Real estate | 2013 |
| Pewtner Grooming Supplies Limited | Manufacturing | 2024 |
| Pewtner Group Ltd | Construction | 2026 |
| PFS Gym & Sports Nutrition Limited | Arts & recreation | 2025 |
| PG Shadow Company Ltd | Transport & logistics | 2023 |
| PGI Care Limited | Health & social care | 2021 |
| Pgkw Limited | Real estate | 2021 |
| PGM Consultancies Ltd | Information & communication | 2022 |
| PH Engineering Support Limited | Professional & scientific | 2012 |
| PH Newport Limited | Hospitality | 2025 |
| Phantomsoft Ltd | Information & communication | 2024 |
| Pharm@Logic Ltd | Health & social care | 2009 |
| Pharvey Consultancy Ltd | Information & communication | 2018 |
| Phase One Traffic Management Training Ltd | Professional & scientific | 2013 |
| PHASE1 Traffic Management Services Ltd | Administrative & support | 2020 |
| Phat Prophets Limited | Professional & scientific | 2008 |
| Phelps Plant Limited | Professional & scientific | 2017 |
| Phemprest Ventures Ltd | Other services | 2015 |
| Pheonix Commercial Ltd | Professional & scientific | 2018 |
| Phil Bessant Limited | Professional & scientific | 2012 |
| Phil Bessant LSG Limited | Professional & scientific | 2018 |
| Phil Churchill's Fish Bar Limited | Wholesale & retail | 2006 |
| Phil Harvey Tyres Limited | Wholesale & retail | 2016 |
| Phil Kirkland Limited | Manufacturing | 2013 |
| Phil Oakley Contractors Limited | Construction | 2005 |
| Phil Raynsford Associates Ltd | Education | 2016 |
| Phil Salmon Planning Limited | Professional & scientific | 2013 |
| Phil Titterton Ltd | Manufacturing | 2018 |
| Philip Maddocks Farms Ltd | Agriculture & fishing | 2025 |
| Phillip Alderman Limited | Health & social care | 2009 |
| Phillips Electrical Engineers Limited | Construction | 2018 |
| Phillips Price Services Limited | Construction | 2010 |
| Phillips Wellbeing Services Ltd | Health & social care | 2004 |
| Phillis Enterprises Ltd | Professional & scientific | 2018 |
| PHO Properties Ltd | Real estate | 2025 |
| Phoebanna Consulting Limited | Professional & scientific | 2021 |
| Phoenix and Jenson Security Ltd | Administrative & support | 2026 |
| Phoenix Blinds, Shutters and Curtains Limited | Construction | 2024 |
| Phoenix Martial Arts Limited | Education | 2021 |
| Phoenix Powder Coating Ltd | Construction | 2012 |
| Phoenix Properties (South West) Limited | Construction | 2024 |
| Phoenix Supplies Limited | Wholesale & retail | 2022 |
| Phoenix Taekwondo Academy Limited | Education | 2022 |
| Phoenix Training (Newport) Limited | Health & social care | 2015 |
| Phone Town Ltd | Wholesale & retail | 2025 |
| Phoneboss Newport Ltd | Wholesale & retail | 2022 |
| Phonevalley Limited | Other services | 2023 |
| Photo Unique Ltd | Wholesale & retail | 2013 |
| PHX Expedition Ltd | Transport & logistics | 2025 |
| Physe Limited | Mining & quarrying | 2002 |
| PIA & Williams Ltd | Construction | 2018 |
| Piano Rite Ltd | Hospitality | 2024 |
| Pick UP and Press Limited | Other services | 2013 |
| Pick UP Media Distribution Ltd. | Administrative & support | 2012 |
| Pico AMP Engineering Ltd | Construction | 2023 |
| Pictonia Limited | Administrative & support | 2026 |
| Piece of Cake Resourcing Ltd | Construction | 2019 |
| Pier View Court (IOW) Management Company Limited | Households | 2005 |
| Piers Francis Promotions Ltd | Arts & recreation | 2017 |
| Pike Logistics Limited | Transport & logistics | 2019 |
| Pikes Limited | Agriculture & fishing | 2005 |
| Pill Fast Food Ltd | Hospitality | 2024 |
| Pill Sporting Club FC Ltd | Arts & recreation | 2025 |
| Pillar & Peak Ltd | Wholesale & retail | 2026 |
| Pillgwenlly Connects CIC | Information & communication | 2022 |
| Pillgwenlly Millennium Trust Limited | Arts & recreation | 2000 |
| Pillmawr Biomass Limited | Manufacturing | 2016 |
| Pillow Finance Limited | Financial services | 2019 |
| Pimak Limited | Wholesale & retail | 2018 |
| PIN UPS IOW Ltd | Other services | 2025 |
| Pine Tops Management Limited | Real estate | 2013 |
| Pineapple Accountancy LLP | | 2023 |
| Pineapple Commerce Limited | Wholesale & retail | 2022 |
| Pinewood Christmas Trees Ltd | Agriculture & fishing | 2018 |
| Pink & Yellow Properties Ltd | Real estate | 2019 |
| Pink Boutique & Tailors Limited | Manufacturing | 2024 |
| Pinnacle Heathcare Support Services Limited | Health & social care | 2017 |
| Pinnacle Plumbing and Heating South Wales Ltd | Construction | 2026 |
| Pinpiri Limited | Wholesale & retail | 2024 |
| Pintiles and Victoria Mews Management Company Limited | Households | 2011 |
| Pioneer Oral Health Limited | Health & social care | 2024 |
| Pipeworkers Caerphilly Limited | Construction | 2012 |
| Pippen Projects Contracts and Consultancy Ltd | Construction | 2025 |
| Pipvo Asset Management Ltd | Financial services | 2024 |
| Pitter Patter Play Ltd | Health & social care | 2023 |
| Pixafusion Marketing Agency Ltd | Information & communication | 2016 |
| Pixagroup Ltd | Information & communication | 2022 |
| Pixaserv Ltd | Information & communication | 2023 |
| Pizza' R US Ltd | Hospitality | 2026 |
| PJ Capital Group Limited | Hospitality | 2020 |
| PJ Cardiff Bay Ltd | Administrative & support | 2017 |
| PJ Chepstow Road Ltd | Administrative & support | 2017 |
| PJ Llanelli Ltd | Administrative & support | 2017 |