| Oxyscale Limited | Information & communication | 2025 |
| Paccur Ltd | Health & social care | 2020 |
| Pace Fitness Pontyclun Limited | Arts & recreation | 2023 |
| Panache Weddings Ltd | Hospitality | 2024 |
| Paper House Plus Ltd. | Wholesale & retail | 1991 |
| Parachutes Childcare Limited | Education | 2011 |
| Parish Green & Beatty Limited | Health & social care | 2001 |
| Park Furnishers (Bristol) Limited | Wholesale & retail | 1981 |
| Passionately Property Ltd | Real estate | 2024 |
| Paul Parry Plant Ltd | Mining & quarrying | 2019 |
| Paul's Fish & Chip Bar Ltd | Hospitality | 2021 |
| Paws & Explore Ltd | Other services | 2016 |
| PBB Property and Investments Ltd | Real estate | 2021 |
| Peloton Club Ltd | Manufacturing | 2017 |
| Pension Path Ltd | Financial services | 2025 |
| Performance BHP Ltd | Wholesale & retail | 2020 |
| Performance Ready 10 Ltd | Arts & recreation | 2024 |
| Pest & Property Solutions Ltd | Administrative & support | 2021 |
| Phildew Holdings Limited | Financial services | 2020 |
| Phillips Family Property Folio Ltd | Real estate | 2018 |
| Phoenix Electrical & Solar Installations Ltd | Construction | 2024 |
| Photography by Lorna Ltd | Professional & scientific | 2012 |
| PIC & MIX Productions Limited | Information & communication | 2008 |
| Pierced by Isobel Limited | Other services | 2025 |
| Pill BUG Interactive Limited | Information & communication | 2017 |
| Pink and Wild Limited | Hospitality | 2025 |
| Pinnacle C E Limited | Professional & scientific | 2023 |
| Pjm's Consultancy Ltd | Professional & scientific | 2024 |
| PJR Logistics Limited | Transport & logistics | 2009 |
| Pjtc Group Limited | Administrative & support | 2025 |
| PKG Innovations Ltd | Hospitality | 2025 |
| Planesight Ltd | Construction | 2024 |
| Planet Sports Management Ltd | Arts & recreation | 2022 |
| Platinum CW & Valeting Limited | Administrative & support | 2024 |
| Pontyclun Padel Limited | Arts & recreation | 2026 |
| Pontyclun Rugby Football Club Limited | Arts & recreation | 2024 |
| Pooopa Scooopa Limited | Administrative & support | 2024 |
| Porky's Brunch Club Ltd | Hospitality | 2024 |
| Portcullis Ventures Ltd | Real estate | 2017 |
| Positive Safety Solutions Ltd | Professional & scientific | 2020 |
| Posters and Stuff Ltd | Wholesale & retail | 2007 |
| PPM Home Improvements Ltd | Construction | 2026 |
| Practical Planning Solutions Ltd | Professional & scientific | 2022 |
| Praxisplus Ltd | Construction | 2008 |
| Precious Metals Recycling Limited | Manufacturing | 2023 |
| Precision Property & Vehicle Services Ltd | Construction | 2025 |
| Pren Interiors Ltd | Manufacturing | 2022 |
| Prichard Aggregates Limited | Water & waste | 2021 |
| Prichard Concrete Limited | Manufacturing | 2025 |
| Prichard Demolition Limited | Water & waste | 2009 |
| Prichard Rail Limited | Construction | 2018 |
| Prichard Remediation Limited | Water & waste | 2019 |
| Prichard Rentals Limited | Administrative & support | 2020 |
| Prichard Tool Hire Limited | Administrative & support | 2025 |
| Primesite Properties (UK) Ltd | Construction | 2008 |
| Primo Ventures Ltd | Real estate | 2024 |
| Prings Plumbing and Heating Ltd. | Construction | 2017 |
| Pristine Shine Cleaning Co Ltd. | Administrative & support | 2025 |
| Pro Point - UK Holdings Limited | Financial services | 2019 |
| Pro Point Group Limited | Construction | 2025 |
| Proco Papers Europe Limited | Extraterritorial | 2015 |
| Project Red Recycling Limited | Water & waste | 2015 |
| Properties by Pippa Limited | Real estate | 2017 |
| Protape Plastering Systems Limited | Construction | 2019 |
| Pump PAL Limited | Manufacturing | 2012 |
| Purever Coldkit UK Ltd | Administrative & support | 2005 |
| Purever Industries UK Limited | Financial services | 2018 |
| Purever UK Ltd | Manufacturing | 2008 |
| Pyne Contractors Limited | Extraterritorial | 2020 |
| QB Deliveries Ltd | Transport & logistics | 2025 |
| Quadrant Vehicles Ltd | Wholesale & retail | 2006 |
| Quantum Property Services Limited | Real estate | 2016 |
| R James Plumbing & Heating Limited | Construction | 2019 |
| R P Traffic Management Limited | Other services | 2005 |
| R&J Nicholson Ltd | Real estate | 2025 |
| R&K & Co. Holdings Ltd | Financial services | 2023 |
| R&K Building Construction Ltd | Construction | 2025 |
| R7 Travel Executive Limited | Transport & logistics | 2021 |
| RA Health Staffing Ltd | Health & social care | 2026 |
| RAG House Studio Ltd | Professional & scientific | 2016 |
| Randeva Group Ltd | Real estate | 2022 |
| RDW Software Services Ltd | Information & communication | 2019 |
| Red Robot Web Design Ltd | Information & communication | 2019 |
| REDI-159 Limited | Professional & scientific | 2004 |
| Reel Label Solutions (Holdings) Ltd | Financial services | 2022 |
| Reel Label Solutions Limited | Manufacturing | 2001 |
| Reel TV Scenery Ltd | Information & communication | 2022 |
| Rees Consultancy Services Limited | Professional & scientific | 2019 |
| Regen Construction Group Ltd | Construction | 2023 |
| Reivers Wholesale Limited | Wholesale & retail | 2006 |
| Rekoj Venture Capital Ltd | Real estate | 2025 |
| Respect Care and Training Ltd | Education | 2017 |
| Revops Limited | Information & communication | 2024 |
| Revvity (UK) Holdings Limited | Professional & scientific | 1999 |
| Revvity (UK) Limited | Professional & scientific | 1999 |
| Revvity International Holdings | Financial services | 2002 |
| Revvity Limited | Manufacturing | 1999 |
| Rezeki Ltd | Wholesale & retail | 2021 |
| RGL Heating Limited | Construction | 2023 |
| RHH Developments Limited | Real estate | 2019 |