| Refresh Trading Limited | Hospitality | 2005 |
| Regency Block Cleaning Ltd | Administrative & support | 2017 |
| Regency Cleaning Solutions Ltd | Administrative & support | 2014 |
| Regency House Keeping Ltd | Administrative & support | 2017 |
| Regis Court (Worthing) Limited | Households | 1984 |
| Regulate to Accumulate Ltd | Health & social care | 2025 |
| Rend Plus Ltd | Construction | 2013 |
| Renewable Contracts Limited | Extraterritorial | 2012 |
| Renova Associates Limited | Information & communication | 2026 |
| Repairsmart Sussex Limited | Wholesale & retail | 2019 |
| Reserata Capital Limited | Real estate | 2016 |
| Respect Wills & Estate Planning Ltd | Professional & scientific | 2017 |
| Retail Resolutions Limited | Professional & scientific | 2012 |
| Revive Fitness & Nutrition Sussex Ltd | Arts & recreation | 2025 |
| Revive O2 Ltd | Health & social care | 2025 |
| Rewild Project Ltd | Information & communication | 2024 |
| Rf-Home Solutions Limited | Real estate | 2024 |
| Rfmas UK Limited | Wholesale & retail | 2009 |
| Rhubarb Creative Limited | Professional & scientific | 2002 |
| Rich Sage Consulting Ltd | Information & communication | 2026 |
| Richard Johns Limited | Health & social care | 2011 |
| Richard Kooijman Consultancy Ltd | Professional & scientific | 2020 |
| Richard SUE Bianca Canada Properties Limited | Other services | 2003 |
| Richard West Property Restoration Ltd | Construction | 2018 |
| Rie-Store Limited | Wholesale & retail | 2012 |
| Right/Left Projects Ltd | Arts & recreation | 2019 |
| Ring Tanker Services Ltd | Wholesale & retail | 2018 |
| Riptide Films Ltd | Information & communication | 2020 |
| Rise Group Ltd | Construction | 2015 |
| Rise Medical Services Limited | Health & social care | 2019 |
| River Breeze Apartments Ltd | Hospitality | 2024 |
| Riverside Fish Ltd | Wholesale & retail | 2019 |
| Riverside Precision Products Limited | Professional & scientific | 1992 |
| Riverside Wharf Freehold Limited | Households | 2025 |
| Riverside Wharf RTM Company Limited | Households | 2024 |
| RJA86 Ltd | Information & communication | 2018 |
| RJB Plastering & Rendering Ltd | Construction | 2026 |
| Rkec Limited | Construction | 2005 |
| Rkec Property Limited | Real estate | 2015 |
| Rlbb Ltd | Financial services | 2025 |
| RLM Electrical Ltd | Construction | 2015 |
| RML Financial Limited | Professional & scientific | 2004 |
| Roadstar Cars Limited | Wholesale & retail | 2019 |
| ROB Brown Enterprises Limited | Wholesale & retail | 2014 |
| Robert DE Mortain Management Ltd | Households | 2018 |
| Robertson Electrical South Limited | Construction | 2020 |
| Rockhopper Roaster Limited | Manufacturing | 2025 |
| Rockpool Holiday Properties Limited | Extraterritorial | 2024 |
| Rolland Consultancy Trading Limited | Professional & scientific | 2013 |
| Roly's Fudge Pantry Worthing Ltd | Wholesale & retail | 2021 |
| ROM Wine Ltd | Wholesale & retail | 2023 |
| Root Pro UK Ltd | Real estate | 2021 |
| Rootless & Sons Ltd | Professional & scientific | 2015 |
| Roselands Freehold and Management Limited | Households | 2011 |
| Rosemary's Parlour Management Limited | Households | 2002 |
| Rosette Chef Limited | Manufacturing | 2026 |
| Rowina Healthcare Services Ltd | Health & social care | 2015 |
| Royol Fish Bar Ltd | Hospitality | 2023 |
| RPC Engineering & Consultancy Ltd | Professional & scientific | 2024 |
| RPM Tiling Ltd | Construction | 2020 |
| RS Utilities & Water Treatment Ltd | Construction | 2022 |
| Rubix Cube Events Ltd | Hospitality | 2005 |
| Ruby ZHU Essex Limited | Administrative & support | 2014 |
| Rudford Industrial Estate Management Company Limited | Households | 1988 |
| Rumble Postproduction Limited | Arts & recreation | 2008 |
| Russell Investment Holdings Ltd | Financial services | 2025 |
| Rustington Cars Ltd | Wholesale & retail | 2003 |
| Rustington Chinese Restaurant Ltd | Hospitality | 2021 |
| Rustington Cleaning Services Limited | Administrative & support | 2008 |
| Rustington Golf Centre Limited | Arts & recreation | 1991 |
| Rustington Golf Centre Online Limited | Extraterritorial | 2010 |
| Rustington Holdings (NO.1) Limited | Financial services | 2022 |
| Rustington Holdings Limited | Financial services | 2000 |
| Rustington Home & Hardware Ltd | Wholesale & retail | 2012 |
| Rustington Investments Limited | Real estate | 2000 |
| Rustington Park Estate Limited | Real estate | 2014 |
| Rustington Tanning Ltd | Health & social care | 2025 |
| Rustington Washeteria Limited | Administrative & support | 2017 |
| RXN Holdings Ltd | Real estate | 2021 |
| Ryan Holdings Limited | Real estate | 2018 |
| Ryebank Gate (Yapton) Management Company Limited | Households | 2022 |
| S and R TV Specialists Ltd | Manufacturing | 2016 |
| S C Electrix Limited | Construction | 2015 |
| S C H (Sussex) Limited | Manufacturing | 2003 |
| S Cosmetics Limited | Other services | 2022 |
| S H Research Limited | Health & social care | 2010 |
| S I Protech (UK) Limited | Manufacturing | 2000 |
| S J Rush & Associates Limited | Professional & scientific | 2001 |
| S J Stubbs Limited | Administrative & support | 2018 |
| S L Power Electronics Ltd | Professional & scientific | 2005 |
| S P M Masonry Limited | Construction | 2007 |
| S&J Spotted COW Ltd | Hospitality | 2023 |
| S&V Digital Strategies Ltd | Manufacturing | 2024 |
| S.F.S.T. Limited | Households | 1985 |
| S.L.H. DRY Cleaners Ltd | Other services | 2012 |
| S.T.S. Communications Limited | Information & communication | 1984 |
| SA Project Contracting (UK) Limited | Professional & scientific | 2022 |
| SAB Trade Solutions Ltd | Construction | 2026 |
| Safe Site Direct Limited | Administrative & support | 2015 |
| Safe Site Facilities Ltd | Administrative & support | 2009 |