| Production Utilities Ltd | Construction | 2023 |
| Professional Indoor Sports Seriously TPA Ltd | Arts & recreation | 2022 |
| Professional Plastics Ltd | Wholesale & retail | 2019 |
| Proflame Heating Ltd | Construction | 2026 |
| Progressive People - Supply Ltd | Information & communication | 2021 |
| Progressive People Ltd | Administrative & support | 2021 |
| Proinsight Consult Global Ltd | Health & social care | 2022 |
| Proiseas Consulting Limited | Professional & scientific | 2025 |
| Project Boxing Limited | Arts & recreation | 2023 |
| Project Cleaning Services Limited | Administrative & support | 2022 |
| Project Ignite Bidco Limited | Financial services | 2025 |
| Project Resolutions & Consultants Ltd | Construction | 2010 |
| Proline Roofing and Building Ltd | Construction | 2023 |
| Promec Engineering Consultancy Limited | Professional & scientific | 2021 |
| Prop Firm Solutions Ltd | Administrative & support | 2024 |
| Property Development Dubois Limited | Real estate | 2024 |
| Propstone FX Limited | Information & communication | 2023 |
| Prostyles Hair Limited | Wholesale & retail | 2016 |
| Proteus Transition Services Ltd | Information & communication | 2004 |
| Protobus Ltd | Information & communication | 2025 |
| Provathi 15 Ltd | Hospitality | 2025 |
| Proven Path Strategies Ltd | Professional & scientific | 2024 |
| Proxom Engineering Ltd | Professional & scientific | 2020 |
| Prudentia Limited | Professional & scientific | 2021 |
| PS Halsey & SON Ltd | Construction | 2025 |
| PSM Pharma Ltd | Wholesale & retail | 2022 |
| PTR Management Limited | Professional & scientific | 2016 |
| Puffin Capital Ltd | Real estate | 2023 |
| Pulp the Classics Limited | Extraterritorial | 2013 |
| Pulse Laser Restorations Ltd | Other services | 2026 |
| Pulse Monitoring Ltd | Information & communication | 2026 |
| Pure Dentistry Limited | Health & social care | 2013 |
| Pure Tents Ltd | Hospitality | 2018 |
| Purple Oak Limited | Professional & scientific | 1998 |
| Purple Pyramid Investment Group Ltd | Administrative & support | 2020 |
| PXG Consulting Limited | Information & communication | 2017 |
| Q.E.D. Independent Testing & Consultancy Limited | Wholesale & retail | 2001 |
| QA Matters Ltd | Information & communication | 2023 |
| QI Solutions Limited | Information & communication | 2008 |
| QP Logistics & Consultancy Limited | Wholesale & retail | 2021 |
| Quadrant Print & Design Limited | Manufacturing | 2005 |
| Quantech Air Conditioning Ltd | Construction | 2026 |
| Quasicode Ltd | Information & communication | 2020 |
| Qubit Edge Limited | Information & communication | 2020 |
| Quinlan Asset Management Ltd | Real estate | 2017 |
| Quinticon Ltd | Professional & scientific | 2022 |
| Quinttouch Ltd | Health & social care | 2025 |
| Quizerouk Limited | Professional & scientific | 2026 |
| R S a a Private Limited | Transport & logistics | 2025 |
| R&D Healthcare Ltd | Hospitality | 2014 |
| R. Davies Construction Limited | Construction | 2002 |
| R1 UK Developments Ltd | Real estate | 2026 |
| R1DER Ltd | Information & communication | 2024 |
| R2R Energy Ltd | Administrative & support | 2026 |
| R3 Propco UK Ltd | Real estate | 2026 |
| RA Digital Art Limited | Wholesale & retail | 2025 |
| Rachu Laundry Services Ltd | Other services | 2024 |
| Racing Stripes Limited | Professional & scientific | 2007 |
| RAD Media Limited | Arts & recreation | 2017 |
| Radicalize Limited | Professional & scientific | 2000 |
| Radlett Homes Limited | Real estate | 2009 |
| Radvia Consulting Ltd | Professional & scientific | 2025 |
| Raifah International Ltd | Wholesale & retail | 2022 |
| Rainmaker Marketing Ltd | Extraterritorial | 2022 |
| Rakesmoor Limited | Information & communication | 2011 |
| Ralph Catton Investments Limited | Real estate | 2016 |
| Raltone Limited | Construction | 2017 |
| Ramsay Assets Ltd | Real estate | 2022 |
| Ran-Uk Ltd | Information & communication | 2013 |
| Randolph & Gilbert Limited | Real estate | 2021 |
| Ratsbi Ltd | Professional & scientific | 2011 |
| Rattan International Ltd | Real estate | 2026 |
| Ravi Bains Consulting Limited | Professional & scientific | 2024 |
| Raymedy Ltd | Professional & scientific | 2024 |
| Razaq Holdings Ltd | Real estate | 2020 |
| RB Marshall Holdings Limited | Financial services | 2025 |
| RCA Belfast Ltd | Education | 2010 |
| RCC Partnership Limited | Professional & scientific | 2020 |
| Rcca UK Ltd | Professional & scientific | 2021 |
| RCE Management Company Ltd | Administrative & support | 2020 |
| RDB Properties and Developments Limited | Real estate | 2022 |
| RDB Property Estates Ltd | Real estate | 2024 |
| RDF Consulting Ltd | Professional & scientific | 2020 |
| RDH Business Services Limited | Professional & scientific | 2013 |
| RDT Architects Limited | Professional & scientific | 1999 |
| Re-Wechsel Ltd | Wholesale & retail | 2023 |
| REA Consultancy Services Ltd | Wholesale & retail | 2024 |
| Reactive Markets Limited | Administrative & support | 2019 |
| Reactive Markets Technologies Limited | Financial services | 2025 |
| Real Estate Legal Consultancy Limited | Professional & scientific | 2020 |
| Real Mechanical Services Limited | Construction | 2018 |
| Realtyiq Group Ltd | Real estate | 2025 |
| Rebecca Jade Health and Beauty Limited | Other services | 2016 |
| Rebel Telecom Limited | Information & communication | 2025 |
| Rebel Therapies Ltd | Administrative & support | 2023 |
| Record Level Limited | Real estate | 2000 |
| Record Level UK Limited | Real estate | 2003 |
| Recovery Fitt Limited | Arts & recreation | 2025 |
| Rectory Freeholders Limited | Households | 1961 |
| Red Oak Enterprises Limited | Real estate | 2008 |