| Physical Digital Engineering Solutions Limited | Professional & scientific | 2015 |
| Physiomatters Limited | Health & social care | 2002 |
| Physioskills Limited | Other services | 2012 |
| Physiospace Limited | Health & social care | 2018 |
| PHYSIQUE24 Elite Star Training Ltd | Health & social care | 2022 |
| Phythian Content & Consulting Limited | Other services | 2015 |
| Phytocan Ltd | Wholesale & retail | 2019 |
| Phénix Property Solutions Ltd | Real estate | 2019 |
| PI Accessories Fashion Ltd | Wholesale & retail | 2025 |
| PI Consulting Cymru Limited | Professional & scientific | 2003 |
| PI Property Ltd | Real estate | 2025 |
| Piazza (Cardiff) RTM Company Limited | Households | 2024 |
| Piazza 2 (Cardiff) RTM Company Limited | Households | 2024 |
| Piazza 3 (Cardiff) RTM Company Limited | Households | 2024 |
| Piazza 4 (Cardiff) RTM Company Limited | Households | 2024 |
| Piazza Estates Limited | Real estate | 2006 |
| PIC Cardiff Ltd | Arts & recreation | 2026 |
| Picanto Ltd | Wholesale & retail | 2025 |
| Picart Print & Design Ltd | Manufacturing | 2018 |
| Piccolino Pictures Ltd | Information & communication | 2013 |
| Picflics Animation Limited | Information & communication | 2024 |
| Pichay ELU DSE Ltd | Wholesale & retail | 2026 |
| Pick ME Taxi Ltd | Administrative & support | 2016 |
| Pick N Drive Ltd | Wholesale & retail | 2020 |
| Picket Post Consulting Limited | Information & communication | 2018 |
| Pickle Software Ltd | Information & communication | 2017 |
| Pickleball World Ltd | Wholesale & retail | 2024 |
| Pickles & Bickerton Limited | Professional & scientific | 2015 |
| Pickpadi Global Ltd | Information & communication | 2025 |
| Picks Ltd | Wholesale & retail | 2025 |
| Picks Properties Limited | Real estate | 2022 |
| Picl Animation Ltd | Information & communication | 2017 |
| Picnic-It Ltd | Information & communication | 2025 |
| Piconnas Business Support Services Ltd | Administrative & support | 2026 |
| Piconnas Event Management Ltd | Arts & recreation | 2026 |
| Piconnas Holiday Lets Ltd | Hospitality | 2026 |
| Piconnas Real Estates Ltd | Real estate | 2026 |
| Picsgwenno Limited | Administrative & support | 2011 |
| Picton & Co Stores Ltd | Wholesale & retail | 2023 |
| Picton Castle Dairy Limited | Agriculture & fishing | 2013 |
| Picton Insulation Limited | Professional & scientific | 2025 |
| Picture Learning Ltd | Education | 2020 |
| Picturecraft (Wales) Ltd | Wholesale & retail | 2013 |
| Pidary Stores Ltd | Wholesale & retail | 2025 |
| PIE Queen Limited | Wholesale & retail | 2026 |
| PIE UK Investments Ltd | Real estate | 2021 |
| Piece of PIE Ltd | Hospitality | 2023 |
| Piemato Ltd | Real estate | 2020 |
| Pier House Cafe Limited | Hospitality | 2023 |
| Piercarlo’S Truck Ltd | Hospitality | 2019 |
| Piercefield Place Ltd | Real estate | 2024 |
| Piero Property Ltd | Real estate | 2022 |
| Pierogi Cardiff Ltd | Hospitality | 2024 |
| Pierre&Import Company Limited | Wholesale & retail | 2024 |
| Pierre's International Ltd | Wholesale & retail | 2024 |
| Pieszen Ltd | Wholesale & retail | 2025 |
| Pietri Ltd | Wholesale & retail | 2023 |
| Piety Stall Ltd | Wholesale & retail | 2023 |
| Pifim Capital Ltd | Administrative & support | 2016 |
| Pifim Company Ltd | Administrative & support | 2016 |
| Pifim Properties Ltd | Real estate | 2017 |
| PIG Property Group Limited | Real estate | 2026 |
| Piggyback Property Solution Ltd | Households | 2020 |
| PIK N Ship Ltd | Wholesale & retail | 2025 |
| PIK Properties Ltd | Real estate | 2025 |
| Pike Coaches Ltd | Wholesale & retail | 2026 |
| Pikel Services Limited | Health & social care | 2018 |
| Pikkle Ltd | Hospitality | 2023 |
| Pilates in Class Ltd | Other services | 2024 |
| Pilati Ltd | Information & communication | 2012 |
| Pilchard Shed Ltd | Construction | 2019 |
| Pilgrim's Lodge Ltd | Hospitality | 2022 |
| Pilgrims Pride Corporation Ltd | Wholesale & retail | 2026 |
| Pili Pala Collective Ltd | Professional & scientific | 2025 |
| Pili Pala Group Limited | Financial services | 2023 |
| Pili Pala Social Ltd | Information & communication | 2024 |
| Pill Consulting Ltd | Professional & scientific | 2020 |
| Pillar Build Limited | Construction | 2025 |
| Pillar Constructors Group Ltd | Construction | 2024 |
| Pillar Logic Ltd | Information & communication | 2025 |
| Pillington Interiors Ltd | Construction | 2020 |
| Pillow Stream Ltd | Wholesale & retail | 2026 |
| Pilsworth Depot Limited | Wholesale & retail | 2022 |
| Pilton Holdings Limited | Hospitality | 2025 |
| PIM-POL.68 Ltd | Transport & logistics | 2021 |
| Piment Health Care Limited | Health & social care | 2023 |
| Pimpshuei Limited | Hospitality | 2011 |
| Pims Social Care Limited | Health & social care | 2015 |
| Pincio Estates Ltd | Real estate | 2019 |
| Pindoria Group Ltd | Real estate | 2025 |
| Pine & Petal Creations Ltd | Wholesale & retail | 2025 |
| Pinebest Limited | Hospitality | 2021 |
| Pinebest London Limited | Households | 2025 |
| Pinebest of Market Limited | Hospitality | 2025 |
| Pineover Limited | Construction | 2006 |
| Pinereel Limited | Professional & scientific | 2022 |
| Pineshield Management Limited | Health & social care | 2002 |
| Pinetree Care Services Limited | Health & social care | 2004 |
| Pineview Enterprises Limited | Hospitality | 2002 |
| Pinex Limited | Information & communication | 2019 |