| Priory Park Limited | Hospitality | 1963 |
| Prismax Limited | Administrative & support | 2024 |
| Pro - Fitness Direct Limited | Wholesale & retail | 2003 |
| Procurem Limited | Professional & scientific | 2007 |
| Professional Development (UK) Limited | Other services | 1994 |
| Proficia Solutions Limited | Financial services | 2006 |
| Programmatics Limited | Information & communication | 1993 |
| Prometheus Life Design and Transformation Coaching Limited | Health & social care | 2021 |
| Promonet Ltd | Information & communication | 2019 |
| Promore Ltd | Real estate | 2024 |
| Propertysmiths Renovations Ltd | Real estate | 2023 |
| Prosequence Ltd | Professional & scientific | 2003 |
| Prosteel Limited | Construction | 2003 |
| PS Eyecare Ltd | Health & social care | 2023 |
| Purpose Unleashed Ltd | Administrative & support | 2016 |
| Purrgleamdesigns Ltd | Wholesale & retail | 2025 |
| Purrsparkornaments Ltd | Wholesale & retail | 2025 |
| Purrtidecraft Ltd | Wholesale & retail | 2025 |
| Pyroflex Limited | Professional & scientific | 2001 |
| Q Ball Lease Company Limited | Real estate | 1999 |
| Qassist Ltd | Information & communication | 2023 |
| QHP Limited | Real estate | 2008 |
| QQ Holdings Ltd | Real estate | 2022 |
| QSF Limited | Construction | 2004 |
| Quest Gifts Ltd | Wholesale & retail | 2000 |
| Quid Finance Ltd. | Information & communication | 2023 |
| R & R Howell Enterprises Limited | Construction | 2007 |
| R D Proost (PIG Farm) | | 1991 |
| R H Carpenters (UK) Limited | Construction | 2003 |
| R J B Building Services Ltd | Construction | 2003 |
| R J J Freight Limited | Transport & logistics | 1993 |
| R&A Northern Properties Ltd | Real estate | 2023 |
| R. Ashton & SON Limited | Wholesale & retail | 2002 |
| R.C. Partridge & Co. Limited | Agriculture & fishing | 1997 |
| R.D. Castings Limited | Manufacturing | 1976 |
| R.E. Cadge Limited | Wholesale & retail | 1942 |
| R.P.S. Transport (Ipswich) Limited | Transport & logistics | 1984 |
| R.W. Curle Limited | Construction | 2004 |
| R8TEDFIT Limited | Wholesale & retail | 2025 |
| Racing Homes | Hospitality | 2008 |
| Racing Welfare | Health & social care | 2000 |
| Racing Welfare (Enterprises) Limited | Extraterritorial | 1994 |
| Rademaker Limited | Manufacturing | 1982 |
| Radian Technical Group Ltd | Professional & scientific | 2014 |
| Radiant Group Holdings Ltd | Financial services | 2023 |
| Radiotronics Limited | Wholesale & retail | 2015 |
| Raedwald Drive RTM Company Limited | Households | 2017 |
| Rainham Commodities Limited | Manufacturing | 1996 |
| Randall Surveys LLP | | 2005 |
| Random Engineering Limited | Information & communication | 2007 |
| Rapid Accounting Ltd | Professional & scientific | 2023 |
| Rapid Nutrition PLC | Manufacturing | 2012 |
| Rapido Horse Services (U.K.) Limited | Transport & logistics | 1991 |
| Rathnasiri Ltd | Wholesale & retail | 2026 |
| Rave Properties Limited | Real estate | 2024 |
| Raycom Consultants Limited | Information & communication | 2004 |
| Razaq L Consultants Limited | Health & social care | 2025 |
| RCP Fleet Support Ltd | Manufacturing | 2023 |
| Re.Form Property Ltd | Real estate | 2020 |
| Real East Anglian Cask Houses Limited | Hospitality | 2003 |
| Rebrnd Collective Ltd | Wholesale & retail | 2022 |
| Red Apple Rooms Ltd | Real estate | 2023 |
| Red Star Parcels Limited | Extraterritorial | 2022 |
| Reedland Meats Limited | Wholesale & retail | 2007 |
| Reefflareco Ltd | Wholesale & retail | 2025 |
| Regal Leisure Homes Limited | Manufacturing | 2020 |
| Reindeerco Ltd | Information & communication | 2009 |
| Relic Digital Ltd | Professional & scientific | 2025 |
| Remote Nomads Ltd | Wholesale & retail | 2023 |
| Reni Winter Ltd | Administrative & support | 2022 |
| Renning Ltd | Administrative & support | 2025 |
| Reprocad Ltd | Wholesale & retail | 2003 |
| Rescue Paws Limited | Agriculture & fishing | 2025 |
| Research Quality Association Ltd | Other services | 1997 |
| Resourceful Business Solutions Limited | Administrative & support | 2007 |
| Retail Support Limited | Arts & recreation | 1998 |
| Retailstreet Ltd | Wholesale & retail | 2020 |
| Rethink Accountancy EU Services Ltd | Professional & scientific | 2021 |
| Returnabl Limited | Professional & scientific | 2021 |
| Reynolds & Rushton Ltd | Construction | 2004 |
| Rhind & Co Accountants Limited | Professional & scientific | 2006 |
| Riah Properties Limited | Real estate | 2018 |
| Richard Green Financial Services Limited | | 1987 |
| Richard Kihl Limited | Hospitality | 1972 |
| Richrear Solution UK Limited | Professional & scientific | 2025 |
| Ridgeflow Ltd | Information & communication | 2022 |
| Riga Property Services Limited | Real estate | 1986 |
| Rightstream Investments Limited | Extraterritorial | 2002 |
| Rikki Network Limited | Information & communication | 2024 |
| Rising Stars Youth Ltd | Arts & recreation | 2023 |
| Riskcon Limited | Professional & scientific | 2006 |
| Riverbendtreasures Ltd | Wholesale & retail | 2025 |
| Rivers & Waters Limited | Arts & recreation | 2003 |
| RJJ Couriers Ltd | Transport & logistics | 1999 |
| Rmak Holdings Ltd | Wholesale & retail | 2023 |
| Robert Allerton Limited | Professional & scientific | 2002 |
| Robert Collings Limited | Professional & scientific | 2023 |
| Robert King Limited | Arts & recreation | 2003 |
| Robertsons of Woodbridge Limited | Transport & logistics | 1973 |
| Robin Shaw Sound Limited | Information & communication | 2005 |