| Proact Specialist Cleaning Limited | Administrative & support | 2025 |
| Proactive Force Limited | Administrative & support | 2020 |
| Probitas (UK) Limited | Administrative & support | 2007 |
| Products Online Limited | Transport & logistics | 2010 |
| Profectus Accounting Ltd | Professional & scientific | 2026 |
| Progni Logistics Ltd | Transport & logistics | 2026 |
| Progress Retrofit Services Limited | Other services | 2024 |
| Projectify Global Ltd | Wholesale & retail | 2018 |
| Promatar Ltd | Professional & scientific | 2024 |
| Proper Barbers, Hair and Beauty Ltd | Other services | 2022 |
| Property NOW Limited | Real estate | 2014 |
| Propoint Golf Limited | Information & communication | 2015 |
| Protocol Global Limited | Professional & scientific | 2015 |
| Prototrim Ltd | Manufacturing | 2011 |
| Prototrim Manufacturing Limited | Manufacturing | 2016 |
| Psmk Ltd | Construction | 2026 |
| Pulse Ceilings Holdings Limited | Financial services | 2025 |
| Pulse Ceilings Limited | Construction | 2004 |
| Purcell Solicitors Limited | Professional & scientific | 2007 |
| Purday Limited | Hospitality | 2019 |
| Putterfly Ltd | Manufacturing | 2019 |
| QN Coaching Limited | Education | 2013 |
| Quantryva Technologies Ltd | Wholesale & retail | 2026 |
| Quest Surveying Limited | Professional & scientific | 2009 |
| Quirky BEE Studios Ltd | Arts & recreation | 2026 |
| R & E Properties Limited | Real estate | 2010 |
| R & S Landscapes Limited | Administrative & support | 2004 |
| R Flex Ltd | Construction | 2022 |
| R&A Recruiting Ltd | Education | 2018 |
| R&J Kovaci Investment Ltd | Real estate | 2023 |
| R2I Property Ltd | Construction | 2020 |
| Ractive Design Limited | Information & communication | 2006 |
| Ragdoll Training and Therapeutic Services Limited | Health & social care | 2015 |
| Raha Scents Limited | Wholesale & retail | 2017 |
| Rainbow Paintworks Ltd | Wholesale & retail | 2023 |
| Rasoi 6 Ltd | Hospitality | 2023 |
| Rayahope Ltd | Administrative & support | 2021 |
| RBS Choices Limited | Extraterritorial | 2004 |
| RBS Securities PLC | Construction | 2007 |
| RC Cleaning Services Limited | Administrative & support | 2021 |
| RD Landscaping & Paving Ltd | Administrative & support | 2022 |
| RDS Plus Ltd | Education | 2022 |
| Realpack Limited | Professional & scientific | 2007 |
| Rectify Recruitment Ltd | Administrative & support | 2023 |
| Redhills Development Partners Ltd | Construction | 2018 |
| Redway Capital Limited | Professional & scientific | 2026 |
| Reformer Pilates MK Ltd | Arts & recreation | 2024 |
| Refurb Masters Ltd | Real estate | 2025 |
| REG Stpb a Limited | Administrative & support | 2019 |
| REG Stpb B Limited | Administrative & support | 2019 |
| REG Stpb C Limited | Administrative & support | 2019 |
| REG Stpb D Limited | Administrative & support | 2019 |
| REG Stpb E Limited | Administrative & support | 2019 |
| REG Stpb F Limited | Administrative & support | 2019 |
| REG Stpb GF Limited | Administrative & support | 2019 |
| Regal Fire Safety Ltd | Public administration | 2025 |
| Regenera Farming Ltd | Agriculture & fishing | 2025 |
| Regnant Property & Developments Ltd | Real estate | 2012 |
| Reid Construction Services MK Ltd | Construction | 2025 |
| Reina Estates Limited | Extraterritorial | 2015 |
| Resilience Media Ltd | Information & communication | 2025 |
| Resolution (CTP) Ltd | Construction | 2016 |
| Resolution (EL) Ltd | Construction | 2016 |
| Resolution Homes (2019) Ltd | Extraterritorial | 2015 |
| Resolution Homes (Ampthill) Ltd | Construction | 2018 |
| Resolution Homes (BHB) Ltd | Construction | 2015 |
| Resolution Homes (BHL) Ltd | Construction | 2020 |
| Resolution Homes (BKD) Ltd | Construction | 2016 |
| Resolution Homes (GSF) Ltd | Construction | 2022 |
| Resolution Homes (MFS) Ltd | Construction | 2015 |
| Resolution Homes (Roxton) Ltd | Construction | 2015 |
| Resolution Homes (VS) Ltd | Construction | 2020 |
| Resolution Homes (WES) Ltd | Construction | 2016 |
| Resolution Homes (WIT) Ltd | Construction | 2025 |
| Resolution Homes Ltd | Construction | 2003 |
| Resolved-It.Com Ltd | Wholesale & retail | 2012 |
| Respond Care Limited | Health & social care | 2008 |
| Restate Software Ltd | Information & communication | 2023 |
| Reulett Fire and Safety Limited | Professional & scientific | 2010 |
| RG Property Management Ltd | Households | 2007 |
| RGJ Footwear Ltd | Financial services | 2019 |
| Rgproperty Ltd | Real estate | 2007 |
| RHR Motors Group Ltd | Wholesale & retail | 2024 |
| Richard D Walker Consultants Limited | Professional & scientific | 2018 |
| Richard Rowan Ltd | Arts & recreation | 2011 |
| Ricky Ferguson Solutions Ltd | Real estate | 2024 |
| Rigby Asset Holdings Limited | Real estate | 2022 |
| Rimtec UK Ltd | Wholesale & retail | 2009 |
| Ringcroft Farm Limited | Construction | 2012 |
| Rinik Construction Ltd | Construction | 2024 |
| Risdene Limited | Administrative & support | 2025 |
| Riverside Landscapes & Property Maintenance Ltd | Other services | 1999 |
| Riverside Management Company (Monkston Park) Limited | Households | 2004 |
| RJ Buckley Ltd | Professional & scientific | 2019 |
| Rjfwells Ltd | Professional & scientific | 2026 |
| RMM Property Investments Limited | Real estate | 2019 |
| ROB James Roofing Limited | Construction | 2023 |
| Rock & Rollers Ltd | Wholesale & retail | 2024 |
| Rocky Valley Ventures Ltd | Financial services | 2023 |
| Rodeos Group Ltd | Wholesale & retail | 2024 |