| Queen's Way Court (Horsham) Management Limited | Households | 1988 |
| Queenswood Holdings Limited | Financial services | 2019 |
| Quench Holdings Limited | Wholesale & retail | 2024 |
| Quest Tackle Limited | Wholesale & retail | 2017 |
| Questhousingmanagement Ltd | Real estate | 2025 |
| Questmore Construction Ltd | Construction | 1999 |
| Quickfit Container Accessories Limited | Wholesale & retail | 2014 |
| Quickfit Group Ltd | Real estate | 2025 |
| Quietly Bold Ltd | Wholesale & retail | 2025 |
| R & R Carpentry and Construction Ltd | Construction | 2023 |
| R a Baker Grab Services Ltd | Water & waste | 2019 |
| R Aero UK Limited | Administrative & support | 2005 |
| R B Phelps Ltd | Information & communication | 2009 |
| R Charman Pond Restoration & Maintenance Limited | Administrative & support | 2003 |
| R G Parker Limited | Financial services | 2012 |
| R J Harris Building Ltd | Construction | 2025 |
| R J Jochimsen Contractors Limited | Administrative & support | 2017 |
| R J Stirrup & Co Limited | Real estate | 2016 |
| R L Roofing Ltd | Construction | 2026 |
| R P Corse Ltd | Wholesale & retail | 2020 |
| R T Designs Ltd | Arts & recreation | 2023 |
| R&S Auto Group Ltd | Wholesale & retail | 2025 |
| R-Eco Plumbing & Heating Limited | Construction | 2013 |
| R.D.Bean Services Ltd | Construction | 2020 |
| R.G.H. Supplies Limited | Wholesale & retail | 2000 |
| R.K.M. Electrical Services Ltd | Construction | 2011 |
| R.S.P.C.A. Pension Scheme Limited | Professional & scientific | 1972 |
| R.S.P.C.A. Trading Limited | Administrative & support | 1972 |
| R.T.S. Mouldings Limited | Manufacturing | 1978 |
| R2R Tuition Limited | Education | 2000 |
| R3SOLUTE Talent Ltd | Administrative & support | 2024 |
| R44 Properties Ltd | Real estate | 2024 |
| Racing Green Golf Limited | Education | 2004 |
| Racket Business Ltd | Information & communication | 2023 |
| Radd Networks Ltd | Administrative & support | 2017 |
| Radhe Govind Ltd | Administrative & support | 2024 |
| Radium Film Limited | Information & communication | 2016 |
| Radlett Park Golf Club Limited | Arts & recreation | 2020 |
| Radlett Park Land Limited Liability Partnership | | 2020 |
| RAE Roofing & Maintenance Ltd | Construction | 2018 |
| Rafferty Medical Services Limited | Information & communication | 2010 |
| RAG Consulting Ltd | Professional & scientific | 2008 |
| Ragwort Ridder UK Ltd | Financial services | 2022 |
| Rail UK Mini BUS Services Limited | Transport & logistics | 2019 |
| Railwayana Sales Limited | Wholesale & retail | 2000 |
| Rainbo Holdings Limited | Financial services | 2022 |
| Raine Financial Ltd | Administrative & support | 2022 |
| Raise the Bar Studio Ltd | Professional & scientific | 2026 |
| Raja Spice Ltd | Hospitality | 2020 |
| Rajan Zaveri Multimedia Ltd | Information & communication | 2021 |
| Raking Light Films Ltd | Extraterritorial | 2015 |
| RAM Civil Engineering Limited | Construction | 2021 |
| Rambits Estate Ltd | Real estate | 2024 |
| Rampro Roofing Ltd | Construction | 2026 |
| Ramshaw HR Limited | Administrative & support | 2015 |
| Rana and Co Ltd | Construction | 2016 |
| Ranar Properties Ltd | Construction | 2013 |
| Ranar Trading Limited | Wholesale & retail | 2014 |
| RANARP2 Ltd | Real estate | 2021 |
| Randisa Ltd | Professional & scientific | 2016 |
| Randolph Mews (Horsham) Management Company Limited | Households | 2004 |
| Random Hall Hotel Co Limited | Hospitality | 1975 |
| Rannoch Holdings Ltd | Administrative & support | 2021 |
| Rass Property Limited | Real estate | 2024 |
| Ravenbridge Limited | Information & communication | 1992 |
| Ravenstone Estates Ltd | Real estate | 2025 |
| Rawlings Commercial Holdings Limited | Financial services | 2018 |
| Rawlings Commercial Limited | Construction | 1988 |
| Rawlings Roofing Solutions Limited | Construction | 2018 |
| Raymant Developments Limited | Construction | 1983 |
| Raziel Global Ltd | Health & social care | 2022 |
| RBC Marketing Limited | Professional & scientific | 2022 |
| Rbee Consulting Ltd | Professional & scientific | 2014 |
| RBY Air Conditioning Ltd | Construction | 2026 |
| RC Hotel Management Ltd | Professional & scientific | 2022 |
| RCC Pilotage Foundation | Information & communication | 2005 |
| RCC39 Holdings Ltd | Financial services | 2025 |
| Rchm (Services) Allerton Ltd | Professional & scientific | 2022 |
| Rchm (Services) Bridge Ltd | Professional & scientific | 2023 |
| Rchm (Services) Crab & Lobster Ltd | Professional & scientific | 2023 |
| Rchm (Services) Hallgarth Ltd | Professional & scientific | 2023 |
| Rchm (Services) Threeways Ltd | Professional & scientific | 2023 |
| Rchm (Services) Wroxton Ltd | Professional & scientific | 2023 |
| RCM Carpentry (Horsham) Ltd | Manufacturing | 2024 |
| RD Aesthetics Limited | Other services | 2023 |
| RD Collective Ltd | Professional & scientific | 2025 |
| RDN Solutions Ltd | Professional & scientific | 2017 |
| RDO Avionics Support Ltd | Manufacturing | 2025 |
| Re-Engage Solutions Limited | Public administration | 2025 |
| REA Designs Bespoke Ltd | Wholesale & retail | 2023 |
| Reacks Ltd | Extraterritorial | 2020 |
| Real (Ealing) Limited | Construction | 2009 |
| Real FUN Company Limited | Professional & scientific | 2021 |
| Real Gardening Investments Limited | Construction | 2026 |
| Real Wireless Ltd. | Information & communication | 2006 |
| Reality ED Limited | Information & communication | 2022 |
| Realtime Environment Systems Ltd | Arts & recreation | 2014 |
| Reams Investments Limited | Real estate | 2017 |
| Reamtech Europe Ltd | Information & communication | 2024 |
| Reamtech UK Limited | Information & communication | 2023 |