| PJ Newport Ltd | Hospitality | 2015 |
| PJB Ventilation Services Ltd | Construction | 2013 |
| PJC Property LLP | | 2022 |
| PJH Projects Ltd | Administrative & support | 2020 |
| PJM Houses Limited | Real estate | 2016 |
| PJV Consulting Ltd | Professional & scientific | 2025 |
| PK Developments Ltd | Real estate | 2021 |
| Pk&Mm Ltd | Wholesale & retail | 2021 |
| PKC Developments Limited | Administrative & support | 2002 |
| PKD Tech Limited | Administrative & support | 2017 |
| PKL Care Ltd | Health & social care | 2016 |
| PKN Property Management Ltd | Financial services | 2026 |
| Placestance Property Management Limited | Households | 1993 |
| Plaish Farm Ltd. | Agriculture & fishing | 2018 |
| Planb.Everything Events Limited | Arts & recreation | 2018 |
| Planbase Limited | Information & communication | 2026 |
| Planning Project Controls Ltd | Professional & scientific | 2020 |
| Plant Tribe Ltd | Wholesale & retail | 2024 |
| Plastport Plastering & Building Contractors Ltd | Construction | 2017 |
| Platinum Autocentre Ltd | Wholesale & retail | 2019 |
| Platinum Products Limited | Manufacturing | 2008 |
| Platinum Vans Ltd | Wholesale & retail | 2020 |
| Platopia Limited | Information & communication | 2026 |
| Platt King Davies Ltd | Construction | 2007 |
| Play Ball LLP | | 2020 |
| Play IT NOW Golf Ltd | Arts & recreation | 2025 |
| Play Matters Education Ltd | Education | 2019 |
| Play Netball.Com Limited | Professional & scientific | 2010 |
| Play Smart Golf Ltd | Information & communication | 2026 |
| Play-Days Corporation Limited | Health & social care | 2010 |
| Playful Life CIC | Health & social care | 2020 |
| Pleasant Retreat Developments Limited | Construction | 2019 |
| Pleasant Retreat Properties Limited | Real estate | 2018 |
| Plenty Construction Limited | Construction | 2019 |
| Pleroo Ltd | Administrative & support | 2014 |
| PLH Estates Limited | Real estate | 2013 |
| Plnr Limited | Extraterritorial | 2012 |
| Plus Your Business Ltd | Information & communication | 2015 |
| PM Engineering Solutions Ltd | Transport & logistics | 2026 |
| Pmcy Homes Ltd | Real estate | 2024 |
| Pmcy Properties Ltd | Real estate | 2022 |
| PMG Gwern Y Domen Limited | Real estate | 2019 |
| PMP Accountants Limited | Professional & scientific | 2018 |
| PMW Property Services Limited | Construction | 2012 |
| PN Cherrington Property Ltd | Hospitality | 2026 |
| PNF 2026 Limited | Wholesale & retail | 2025 |
| POD Architecture (London) Limited | Professional & scientific | 2025 |
| POD Consultancy Limited | Professional & scientific | 2024 |
| Pogar Telecommunications Ltd | Information & communication | 2025 |
| Pohco Ltd | Manufacturing | 2018 |
| Poke Collectors Cards Ltd | Wholesale & retail | 2026 |
| Polar Bear Windows Limited | Construction | 2009 |
| Polaris Consultancy Services Ltd | Professional & scientific | 2022 |
| Polarise Media Solutions Ltd | Professional & scientific | 2023 |
| Polished Locks CYF | Other services | 2025 |
| Polku Limited | Administrative & support | 2024 |
| Pollitt Imaging Limited | Health & social care | 2021 |
| Polnel Limited | Transport & logistics | 2023 |
| Polo Warehousing Limited | Transport & logistics | 2014 |
| Poltrade Ltd | Wholesale & retail | 2023 |
| Poly Pack Technologies Ltd | Hospitality | 2017 |
| Poly Technical Limited | Wholesale & retail | 2013 |
| Polydoor Limited | Professional & scientific | 2010 |
| Polymer Trading (South Wales) Limited | Manufacturing | 2009 |
| Ponders END Shide BED & Breakfast Ltd | Hospitality | 2023 |
| Pontagen Ltd | Professional & scientific | 2018 |
| Pontcanna Gym Ltd | Arts & recreation | 2023 |
| Pontcanna Hair Studio Limited | Other services | 2008 |
| Pontfaen Fish Bar Ltd | Hospitality | 2020 |
| Ponthir Engineering Services Ltd | Professional & scientific | 2020 |
| Ponthir Farmshop Ltd | Wholesale & retail | 2021 |
| Ponthir House Ltd | Hospitality | 2026 |
| Ponthir House Ventures Ltd | Hospitality | 2026 |
| Ponthir Sports and Community Club Ltd | Arts & recreation | 2014 |
| Pontiro Ltd | Information & communication | 2024 |
| Pontypool Respray Centre Limited | Wholesale & retail | 2011 |
| Pontypool Rugby Ltd | Arts & recreation | 2016 |
| Pooch on a Pedestal Ltd | Other services | 2019 |
| Poochee Care Ltd | Other services | 2018 |
| Pool Garage Limited | Wholesale & retail | 2013 |
| Pool House Barns Ltd | Extraterritorial | 2014 |
| Poolies Valve Techs Limited | Energy | 2025 |
| Pooltronix (Trustee) Ltd | Professional & scientific | 2025 |
| Pooltronix Limited | Information & communication | 2022 |
| POP & Serve Ltd | Hospitality | 2026 |
| Poplars Bembridge Maintenance Company Limited | Households | 1984 |
| Poppy and Lime Events LLP | | 2016 |
| Poppy and Lime Law Limited | Professional & scientific | 2024 |
| Poppy Housing Ltd | Construction | 2022 |
| Popular Events & Decorations Ltd | Professional & scientific | 2023 |
| Port Harcon Limited | Water & waste | 2024 |
| Port Harcon Shipping Company Limited | Transport & logistics | 2024 |
| Port LA Salle Management Limited | Households | 1994 |
| Portaro (U.K.) Limited | | 1982 |
| Porter Solutions Ltd | Construction | 2025 |
| Porthouse Interiors Ltd | Wholesale & retail | 2025 |
| Portishead Ideal Homes Ltd | Real estate | 2024 |
| Portobelo RTM Company Limited | Households | 2026 |
| Portodue Properties Limited | Real estate | 2024 |
| Portsec Training Ltd | Administrative & support | 2019 |