| RH Investments Southern Ltd | Construction | 2020 |
| RH Leisure Ltd | Wholesale & retail | 2015 |
| RH Studio Ltd | Information & communication | 2019 |
| Rheims Ltd | Administrative & support | 2023 |
| Rhizome Strategy Limited | Professional & scientific | 2022 |
| Rhodes Rentals Limited | Real estate | 2024 |
| Rhona Ross VA Ltd | Administrative & support | 2023 |
| Rhubarb’S Allowance Ltd | Information & communication | 2023 |
| Rhyssphones Ltd | Wholesale & retail | 2025 |
| Riaz Detailing Limited | Wholesale & retail | 2025 |
| Riccaparada Limited | Administrative & support | 2022 |
| Richard Bean Limited | Construction | 2003 |
| Richard Bedson Plumbing & Heating Ltd | Construction | 2016 |
| Richard Davies Investor Relations Limited | Professional & scientific | 2002 |
| Richard Harding Plumbing and Heating Limited | Construction | 2001 |
| Richard John Hair & Beauty Ltd | Other services | 2012 |
| Richard John West Ltd | Manufacturing | 2022 |
| Richard Kennard (Plant Hire) Limited | Administrative & support | 1984 |
| Richard Thornton Limited | Wholesale & retail | 2007 |
| Richdells Wine Merchants Holdings Limited | Wholesale & retail | 2018 |
| Richmond Chiropractic Clinic Limited | Health & social care | 2002 |
| Richsealant Limited | Construction | 2014 |
| Richwards Estate Agents (Sussex) Limited | Real estate | 2018 |
| Richwards Estate Agents Limited | Real estate | 2002 |
| Ride and Glide Limited | Wholesale & retail | 2017 |
| Rider Events Ltd | Hospitality | 2025 |
| Rigel Properties Limited | Construction | 2013 |
| Riggs Plant Limited | Administrative & support | 1999 |
| Right Key Lettings Limited | Real estate | 2023 |
| Rightscope-Ai Ltd | Information & communication | 2026 |
| RIGID8 LLP | | 2025 |
| Rime Commercial Limited | Real estate | 2018 |
| Rimms.Tv Limited | Information & communication | 2014 |
| Ripple International Ltd | Professional & scientific | 2007 |
| Riptide Cards & Collectibles Ltd | Wholesale & retail | 2025 |
| Rishabh Ltd | Wholesale & retail | 2021 |
| Rising UP Film Ltd | Information & communication | 2025 |
| Risk Facilities Limited | Public administration | 2025 |
| Riskfactor Software Limited | Information & communication | 2000 |
| Riskfactor Solutions Limited | Information & communication | 1992 |
| River House School Limited | Real estate | 1985 |
| Riverbend BIO UK Ltd | Professional & scientific | 2020 |
| Riverside Car Repairs Limited | Wholesale & retail | 2014 |
| Rixlow (Surrey) Investments Limited | Real estate | 1989 |
| Rizen Electricals Limited | Construction | 2019 |
| Riznaq Ltd | Health & social care | 2026 |
| RJB Haulage & Grab Hire Ltd | Water & waste | 2021 |
| RJB Property Investments Ltd | Financial services | 2026 |
| RJC Carpentry & Joinery Ltd | Manufacturing | 2023 |
| RJC Roofing Services Limited | Construction | 2021 |
| RJG Construction Group Ltd | Construction | 2015 |
| RJH Construction (Sussex) Limited | Construction | 2012 |
| RJK Electrical (Southern) Limited | Construction | 2023 |
| RJM & Sons Renovations Ltd | Construction | 2019 |
| RJS Building Services Limited | Construction | 2025 |
| RJS Group Holdings Ltd | Financial services | 2021 |
| RJS Waste Management UK Ltd | Water & waste | 2012 |
| RK2023 Limited | Real estate | 2023 |
| RKA Property Developments Limited | Construction | 2024 |
| RKA Western Road Limited | Real estate | 2024 |
| RL Property Group Limited | Real estate | 2024 |
| RLG TRS Limited | Administrative & support | 2015 |
| RM Industries Ltd | Other services | 2019 |
| RMB Technical Publications Ltd | Arts & recreation | 2024 |
| RMH Holdings (Sussex) Limited | Real estate | 2016 |
| RMR (the Dell) Ltd | Construction | 2018 |
| RMR Architecture Ltd | Professional & scientific | 2019 |
| RMR Management Focus Ltd | Professional & scientific | 2026 |
| RMR Shakespeare Ltd | Construction | 2019 |
| RNR Consult Ltd | Professional & scientific | 2024 |
| Roadpower Limited Company Ltd. | Wholesale & retail | 2023 |
| Roadstar Expo Events Limited | Administrative & support | 2021 |
| Roar Content Ltd | Professional & scientific | 2019 |
| ROB Blann Garden Services Limited | Administrative & support | 1999 |
| ROB Bridgewater Ltd | Professional & scientific | 2020 |
| ROB Dove Ltd | Information & communication | 2015 |
| ROB Taylor Plant Hire Limited | Administrative & support | 2006 |
| Robbie a Scott Limited | Information & communication | 2017 |
| Robert Penhallow Limited | Information & communication | 2011 |
| Robertons Limited | Other services | 1955 |
| Roberts Commercial Limited | Real estate | 2018 |
| Roberts Construction Group Ltd | Construction | 2025 |
| Roberts Miller Redshaw Limited | Construction | 2017 |
| Robertson Cafe Worthing Ltd | Hospitality | 2025 |
| Robson Court Ltd | Households | 2026 |
| Robust Floors Holdings Limited | Extraterritorial | 2010 |
| Robust Floors Limited | Construction | 1997 |
| Rocco Management Limited | Real estate | 1996 |
| Rocco Technology Limited | Information & communication | 2024 |
| Rochester Mansions Residents Association Limited | Households | 2004 |
| Rochford Advisers Limited | Financial services | 2021 |
| Rock and Root Landscapes Ltd | Administrative & support | 2026 |
| Rock Ness Studios Ltd | Information & communication | 2018 |
| Rock of Ages Global Resources Ltd | Real estate | 2010 |
| Rockbarton Services Limited | Professional & scientific | 2026 |
| Rockbird Travel Ltd | Administrative & support | 2019 |
| Rocketmill Trustees Limited | Administrative & support | 2021 |
| Rocking Horse Chichester Limited | Real estate | 2016 |
| Rocking Horse Worthing Limited | Hospitality | 2013 |
| Rockit Retro Ltd | Wholesale & retail | 2022 |