| Predator Motorcycle Exhausts Ltd | Manufacturing | 2025 |
| Premier Heat Solutions Ltd | Manufacturing | 2010 |
| Prep Group Limited | Manufacturing | 2025 |
| Press & Starkey LLP | | 2022 |
| Pressurex UK Ltd | Administrative & support | 2023 |
| Prestige Planners Worldwide Ltd | Professional & scientific | 2025 |
| Prim&Pop Ltd | Real estate | 2025 |
| Prima Montessori Limited | Education | 1999 |
| Primanex Limited | Financial services | 2015 |
| Prime Critical Environments Ltd | Professional & scientific | 2026 |
| Prime Impressions Limited | Manufacturing | 1990 |
| Prism Fit OUT Solutions Ltd | Manufacturing | 2021 |
| Priteshv Investments Limited | Financial services | 2021 |
| Pro Music KIT Ltd | Professional & scientific | 2014 |
| Pro Ventilation Ltd | Construction | 2016 |
| Pro-Connexions Ltd | Administrative & support | 2013 |
| Procuriq Limited | Professional & scientific | 2025 |
| Production Gear Limited | Wholesale & retail | 2005 |
| Professional Driver Services Ltd | Professional & scientific | 2002 |
| Profuse Care Ltd | Health & social care | 2015 |
| Prompt Fire Protection Limited | Administrative & support | 2019 |
| Promptex Global Ltd | Wholesale & retail | 2025 |
| Pronalysis Limited | Professional & scientific | 2008 |
| Pronet Installations Ltd | Construction | 2025 |
| Pronti Catering Solutions Limited | Hospitality | 2025 |
| Propermain Ltd | Real estate | 2016 |
| Properties MW Ltd | Real estate | 2021 |
| Property Ready Ltd | Households | 2020 |
| Proppa Branding Limited | Wholesale & retail | 2019 |
| Proserv Management Ltd | Real estate | 2024 |
| Prospect Place Mews Management Company Limited | Real estate | 2010 |
| Protect Canopies Group Ltd | Financial services | 2024 |
| Protect Structures Limited | Manufacturing | 2020 |
| PTC Catering and Decor Ltd | Hospitality | 2022 |
| Ptll Limited | Extraterritorial | 2014 |
| Puddingstone Ltd | Professional & scientific | 2025 |
| Puitam Ltd | Hospitality | 2025 |
| Purchase Direct Limited | Professional & scientific | 1995 |
| Pure Hearts Consulting Ltd | Education | 2024 |
| Q-Consult Ltd | Professional & scientific | 2025 |
| QS Ingredients (UK) Limited | Hospitality | 2014 |
| Quantum Care (Developments) Limited | Administrative & support | 2009 |
| Quantum Consulting Engineers Ltd | Construction | 2020 |
| Quantumsabre Ltd. | Administrative & support | 2023 |
| Quatermass Solutions Ltd | Information & communication | 2016 |
| Quinton's Precision Paintworks Ltd | Construction | 2025 |
| Quirk Consulting Limited | Professional & scientific | 2022 |
| Qvshefford Limited | Real estate | 2022 |
| R E West Heating & Plumbing Limited | Construction | 2019 |
| R J Stewart Ltd | Administrative & support | 2026 |
| R Park Electrical Ltd | Construction | 2019 |
| R&Cclean 4U Limited | Administrative & support | 2020 |
| R&Cclean 4U Ltd Ltd | Administrative & support | 2026 |
| R&M Wallprints Ltd | Manufacturing | 2024 |
| R.I.F.T. Airsoft Limited | Arts & recreation | 2012 |
| R.J.Woolmington Ltd. | Construction | 2014 |
| R3SOLUTION Consulting Limited | Professional & scientific | 2019 |
| Raaj & Sons Limited | Real estate | 2022 |
| Rabley Heath Services Limited | Real estate | 2014 |
| RAC AV Ltd | Administrative & support | 2018 |
| Rach Joky Investment Limited | Professional & scientific | 2017 |
| Racing to Profit Syndicate Ltd | Arts & recreation | 2025 |
| Rack Storage Systems Limited | Wholesale & retail | 1985 |
| Racksanello Ltd | Wholesale & retail | 2021 |
| RAD Electrical Solutions Ltd | Construction | 2023 |
| Radcliffe Developments NW Limited | Real estate | 2023 |
| Radu B. Ciortan Ltd | Wholesale & retail | 2005 |
| RAF Express Limited | Transport & logistics | 2023 |
| Raff's Barbers Limited | Other services | 2017 |
| RAG Global Ltd | Wholesale & retail | 2024 |
| RAG Property Ltd | Real estate | 2022 |
| Raild Imports Limited | Other services | 2015 |
| Rainbow Nursery (Kentish Town) Ltd | Education | 2004 |
| Rainscape Property Limited | Real estate | 2025 |
| Rainscape Technology Ltd | Professional & scientific | 2023 |
| RAJ Medicare Limited | Health & social care | 2011 |
| Ralo Enterprises Limited | Real estate | 2019 |
| RAM Kamal Limited | Information & communication | 2017 |
| RAM Stag Limited | Information & communication | 2019 |
| Rambino's Coffee Company Ltd | Hospitality | 2023 |
| Ramblers Holidays Group Limited | Administrative & support | 2011 |
| Ramsden Surveying Consultancy Limited | Construction | 2014 |
| Rapid Data Systems Ltd | Information & communication | 2024 |
| Rapid Information Systems Limited | Information & communication | 2005 |
| RAS Commercial Investments Ltd | Real estate | 2019 |
| RAW Club Ltd | Professional & scientific | 2025 |
| RAW Image Ltd | Professional & scientific | 2017 |
| RAW Paws Emporium Limited | Wholesale & retail | 2021 |
| RAY RAY Autos Ltd | Wholesale & retail | 2021 |
| Rc&Sk Ltd | Construction | 2017 |
| RCB SG Consultancy Ltd | Health & social care | 2025 |
| RCR Neurology Consulting Limited | Health & social care | 2020 |
| RCS Aesthetics Ltd | Other services | 2023 |
| Reach & Clean Exteriors Ltd | Administrative & support | 2023 |
| Ready Hill Ltd | Wholesale & retail | 2024 |
| Realm IT Partners Ltd | Information & communication | 2013 |
| Rebecca FOX Ltd | Education | 2023 |
| Recare Homes Ltd | Extraterritorial | 2024 |
| Reclus.É Limited | Information & communication | 2026 |
| Reconnecting Dots Ltd | Other services | 2018 |