| Portcullis Enterprises Ltd | Information & communication | 2014 |
| Portcullis Solutions Limited | Professional & scientific | 2013 |
| Porter & Serve Limited | Wholesale & retail | 2018 |
| Porter Chadburn P L C | Professional & scientific | 1972 |
| Porter Construction Consultancy Limited | Professional & scientific | 2025 |
| Porter's Community CIC | Hospitality | 2025 |
| Porth Avondale Court Ltd | Real estate | 2018 |
| Porthamal Court Limited | Households | 2007 |
| Porthcawl Dental Care Limited | Health & social care | 2010 |
| Porthcawl Tandoori Limited | Hospitality | 2013 |
| Portion Trade PC | | 2018 |
| Portland Advisory Limited | Professional & scientific | 2023 |
| Portland House Events and Venue Ltd | Hospitality | 2018 |
| Portland Support Services Limited | Administrative & support | 2017 |
| Portland Wealth Management Limited | Financial services | 2009 |
| Portman Electronics Limited | Information & communication | 1993 |
| Portman Holdings Ltd | Wholesale & retail | 2024 |
| Porto Cleaning Services Ltd | Administrative & support | 2010 |
| Portofino Holdings Ltd | Professional & scientific | 2018 |
| Portsdown Power Limited | Energy | 2016 |
| Portsoken Trustees (NO.2) Limited | Administrative & support | 1980 |
| Portsoken Trustees Limited | Financial services | 1985 |
| Portvogue London Limited | Wholesale & retail | 2025 |
| Portwall Dental Practice Limited | Health & social care | 2019 |
| Portway (Penarth) Management Limited | Households | 1987 |
| Porumbeii Ltd | Information & communication | 2017 |
| Pose Aesthethics Ltd | Health & social care | 2023 |
| Poseidon Fitness MYF Limited | Arts & recreation | 2023 |
| Poseidon Outlets Limited | Hospitality | 2008 |
| Posh Beauty & Academy Limited | Other services | 2024 |
| Posh Beauty & Co Limited | Other services | 2026 |
| Posh Mops UK Ltd | Administrative & support | 2018 |
| Posh Piggy Limited | Wholesale & retail | 2023 |
| Poshposhspecs Limited | Health & social care | 2008 |
| Poshpret Ltd | Wholesale & retail | 2025 |
| Posibl Ltd | Wholesale & retail | 2022 |
| Positano Holdings Limited | Wholesale & retail | 2018 |
| Positiv-It Limited | Professional & scientific | 2007 |
| Positive Approach Limited | Education | 2007 |
| Positive Electrical Cardiff Limited | Construction | 2018 |
| Positive Human Limited | Professional & scientific | 2021 |
| Positive Image Foundation CIC | Health & social care | 2019 |
| Positive Investments Cardiff Ltd | Real estate | 2024 |
| Positive Links (Group) Ltd | Administrative & support | 2018 |
| Positive Primary Limited | Education | 2014 |
| Positive Solutions Pharmacist Limited | Health & social care | 2015 |
| Positive Value Ltd | Information & communication | 2019 |
| Positiveed Psychology Limited | Real estate | 2024 |
| Positively Brilliant Ltd | Education | 2018 |
| Positivity Prints Limited | Wholesale & retail | 2023 |
| Positrax PTY Ltd | Wholesale & retail | 2026 |
| Positronic Consultancy Limited | Professional & scientific | 2014 |
| Posmod Ltd | Wholesale & retail | 2025 |
| Possebon Design Ltd | Wholesale & retail | 2019 |
| Possib Ltd | Wholesale & retail | 2024 |
| Post 1985 Ltd | Information & communication | 2021 |
| Post Box Property Ltd | Real estate | 2026 |
| Postal Packaging Ltd | Wholesale & retail | 2024 |
| Postcard Media Ltd | Information & communication | 2023 |
| Postek Services Ltd | Administrative & support | 2021 |
| Posterity Global Group Ltd | Professional & scientific | 2024 |
| Postersoft Ltd | Information & communication | 2025 |
| Postnbake Limited | Manufacturing | 2020 |
| Postpots Limited | Wholesale & retail | 2003 |
| Posture Parfaite Ltd | Wholesale & retail | 2025 |
| Potenix Ltd | Professional & scientific | 2025 |
| Potion Seller Design Limited | Professional & scientific | 2024 |
| Potter Rees Dolan Trust Corporation Limited | Professional & scientific | 2017 |
| Poultry Nutrition Ltd | Professional & scientific | 2015 |
| Pound World Cardiff Limited | Wholesale & retail | 2026 |
| Poundaround UK Ltd | Wholesale & retail | 2021 |
| Pour X Pour Ltd | Hospitality | 2024 |
| Poutine Box Limited | Hospitality | 2020 |
| Pouvoir Property Management Ltd | Households | 2025 |
| POW Auctions Ltd | Other services | 2019 |
| POW Business Ltd | Wholesale & retail | 2019 |
| Powa Properties Ltd | Real estate | 2024 |
| Powar Medical Ltd | Health & social care | 2018 |
| Powbot Ltd | Financial services | 2025 |
| Powcorporate Group Ltd | Wholesale & retail | 2019 |
| Powderham Drive Residents Association Limited | Real estate | 2005 |
| Powderhouse Theatre Company Limited | Arts & recreation | 2017 |
| Powell Dobson Architects Limited | Professional & scientific | 1999 |
| Powell Dobson LLP | | 2018 |
| Powell Dobson Urbanists LLP | | 2005 |
| Powell Investment Properties Ltd | Real estate | 2014 |
| Powell Lloyd Holdings Ltd | Financial services | 2015 |
| Powell Lloyd Limited | Real estate | 2010 |
| Powell Property Developments Limited | Construction | 2007 |
| Powell Property Limited | Real estate | 2016 |
| Powell Sanders Ltd | Professional & scientific | 2017 |
| Powell.Co.Uk Limited | Extraterritorial | 1999 |
| Power 4 Business Ltd | Construction | 2015 |
| Power Contracts Ltd | Construction | 2016 |
| Power Dress Ltd | Manufacturing | 2015 |
| Power Gateway Capital Ltd | Professional & scientific | 2016 |
| Power Industries Limited | Professional & scientific | 2020 |
| Power IT Solutions Ltd | Information & communication | 2024 |
| Power Mastery Ltd | Wholesale & retail | 2020 |
| Power Northeast Ltd | Administrative & support | 2018 |