| Puig Gros Limited | Extraterritorial | 2001 |
| Pumpkin Enterprises Ltd. | Arts & recreation | 2001 |
| Pumpkin Holdings Limited | Real estate | 2015 |
| Punch the Monkey Ltd | Wholesale & retail | 2026 |
| Punjab Skips Ltd | Water & waste | 2003 |
| Pure Pragmatics Limited | Professional & scientific | 2002 |
| Pure White Laundry & DRY Cleaning Ltd | Other services | 2025 |
| Pyramid Financial Solutions Limited | Financial services | 2004 |
| Pyramid Properties London Limited | Real estate | 2001 |
| Pyramid Property Portfolio Ltd | Real estate | 2020 |
| Q & a Motoring Limited | Administrative & support | 2002 |
| Q Capital (London) Limited | Financial services | 2003 |
| Q-Risk AI Limited | Information & communication | 2026 |
| QC Consulting (London) Limited | Professional & scientific | 1995 |
| QED Accountants Limited | Professional & scientific | 2023 |
| Qedesa Ltd | Manufacturing | 2023 |
| Qlogic Consultancy Limited | Professional & scientific | 2007 |
| QTV Services Limited | Information & communication | 2000 |
| Quads Management Limited | Real estate | 1999 |
| Quality Food Ingredients Company Limited | Manufacturing | 1999 |
| Quality Innovation United Ltd | Professional & scientific | 2019 |
| Quality Scheme for Ready Mixed Concrete(The) | Professional & scientific | 1984 |
| Quality Technical Services Limited | Information & communication | 1987 |
| Quantitative and Risk Consultants Limited | Professional & scientific | 2015 |
| Quantum Capital Ventures Ltd | Real estate | 2024 |
| Quantum I.T. Systems Limited | Information & communication | 1997 |
| Quantum Residentials Limited | Real estate | 1992 |
| Quanyao Limited | Professional & scientific | 2003 |
| Qudos Enterprises Limited | Real estate | 2001 |
| Queenring Limited | Wholesale & retail | 1980 |
| Queenstyle Furniture Ltd. | Wholesale & retail | 2006 |
| Ques Construction Limited | Construction | 2003 |
| Questside Management Limited | Real estate | 2001 |
| Quick Property Solutions GB Limited | Real estate | 2007 |
| Quickcarry Limited | Professional & scientific | 1998 |
| Quinz Company Limited | Construction | 2006 |
| Quotalex Limited | Real estate | 2017 |
| Qureshi Property Investments Ltd | Real estate | 2025 |
| QZ Security Limited | Administrative & support | 2024 |
| R & B Developments Limited | Manufacturing | 1997 |
| R & D Investments Limited | Real estate | 2003 |
| R & R Health Limited | Health & social care | 2019 |
| R & S Portfolio Limited | Real estate | 2017 |
| R & T Transport Limited | Transport & logistics | 1999 |
| R a Investment London Ltd | Real estate | 2001 |
| R and S Services Limited | Information & communication | 1989 |
| R B Shah Accountancy Limited | Professional & scientific | 2003 |
| R G Coker Ltd | Transport & logistics | 2005 |
| R K & L R Ltd | Professional & scientific | 1999 |
| R Leighton Construction Limited | Construction | 2003 |
| R P Unique Limited | Other services | 1999 |
| R Perera Limited | Health & social care | 2007 |
| R S L (Slough) Limited | Real estate | 2001 |
| R&G Electrics (UK) Limited | Other services | 2003 |
| R&R Fresh Produce UK Ltd | Wholesale & retail | 2019 |
| R. Glover Ascroft Limited | Wholesale & retail | 1950 |
| R. K. R. Property Investment Limited | Real estate | 2004 |
| R. S. Electrical & Signalling Services Limited | Energy | 1999 |
| R.B.Harrison and SON Limited | | 1978 |
| R.E.M. Freight Limited | Transport & logistics | 2003 |
| R.F.Young Limited | | 1969 |
| R.H. Accounting Services Limited | Professional & scientific | 1998 |
| R.H. Consulting Associates Limited | Professional & scientific | 1994 |
| R.H.J Carpentry & Property Maintenance Limited | Construction | 2004 |
| R.M. Builders (Ashford) Limited | Construction | 1980 |
| R.R. Accounting Services Limited | Professional & scientific | 2005 |
| R.S Optical Services Limited | Health & social care | 2008 |
| R10 Builders Limited | Construction | 2013 |
| RAB International UK Limited | Administrative & support | 2004 |
| RAC Investments Ltd | Other services | 2017 |
| Rachel Fanconi Associates Limited | Professional & scientific | 1999 |
| Radbourne Estates Limited | Real estate | 2001 |
| Radford Aviation Services Ltd | Manufacturing | 2014 |
| Radha Properties Limited | Real estate | 1998 |
| Radioactive Clothing Limited | Wholesale & retail | 1995 |
| Radnor Court Freehold Limited | Other services | 2004 |
| RAE Jones Limited | Manufacturing | 2009 |
| Rafix Construction Ltd | Construction | 2013 |
| Rahiiq Limited | Wholesale & retail | 2007 |
| RAI Opticians Ltd | Wholesale & retail | 2004 |
| Rainbow Financial Services Limited | Financial services | 2008 |
| Raincheck Services Limited | Construction | 1999 |
| RAJ Investments Limited | Real estate | 2004 |
| Rajmoor Limited | Hospitality | 2007 |
| RAM Motors Limited | Wholesale & retail | 2005 |
| Rama Holdings Limited | Real estate | 2006 |
| Ramco Enterprises Limited | Extraterritorial | 2003 |
| Ramezani (London) Limited | Wholesale & retail | 1993 |
| Rammco Limited | Other services | 2001 |
| Rams Europe Ltd | Information & communication | 2007 |
| Ranbim Properties Ltd | Real estate | 2025 |
| Rangesingle (1996) Limited | Extraterritorial | 1996 |
| Ranjan Civil Engineering Limited | Construction | 2001 |
| Rapid Connect IT Ltd | Other services | 2018 |
| Rapid Growth Solutions Ltd | Information & communication | 2014 |
| Rareteam Limited | Administrative & support | 2000 |
| Raser Limited | Extraterritorial | 1997 |
| Ratchford and Company (Hairdressers) Limited | Other services | 1973 |
| Rathy Jewellers Limited | Manufacturing | 2003 |
| RAV Investment Limited | Real estate | 2007 |