| R&J Consultancy RS (WM) Limited | Administrative & support | 2020 |
| R&N Painting & Decorating Limited | Construction | 2016 |
| R&R Accounting Services Ltd | Professional & scientific | 2018 |
| R&S Greenhouse Ltd | Construction | 2018 |
| R. Barker (Tarring) Limited | Wholesale & retail | 1999 |
| R. G. Brough Limited | Information & communication | 1996 |
| R. Newman Property Limited | Construction | 2024 |
| R.B.S. Garages Limited | Extraterritorial | 1977 |
| R.C.C. (Southern) Limited | Wholesale & retail | 1978 |
| R.Holford (Holdings) Limited | Professional & scientific | 1936 |
| R.J. Meaker (Fencing) Limited | Wholesale & retail | 1985 |
| R.N.Limited | Public administration | 1933 |
| R2D2 Limited | Extraterritorial | 1996 |
| RA & MA Limited | Real estate | 2025 |
| Raadi Ltd | Health & social care | 2026 |
| Rabbit Patch Day Nursery Limited | Education | 2016 |
| RAC Construction Limited | Professional & scientific | 2016 |
| Racecal Limited | Wholesale & retail | 2018 |
| Rachael Capendu Ltd | Real estate | 2021 |
| Rachael SG Medical Limited | Health & social care | 2024 |
| Rachael's Kitchen Property Limited | Real estate | 2016 |
| Rachael`S Kitchen Limited | Manufacturing | 2009 |
| Rachael’S Kitchen Group Limited | Real estate | 2019 |
| Rackway Limited | Wholesale & retail | 2018 |
| Racr Limited | Financial services | 2021 |
| RAD Plumbing Services Limited | Construction | 2009 |
| Radar Farm Ltd | Agriculture & fishing | 2024 |
| Raden Property Management Ltd | Real estate | 2024 |
| Radiance Skincare Limited | Wholesale & retail | 2018 |
| Radio Worthing CIC | Information & communication | 2023 |
| Radpro Property Services Ltd | Real estate | 2022 |
| Radtec Consulting Ltd | Information & communication | 2019 |
| RAE Yates Counselling & Psychotherapy Limited | Health & social care | 2026 |
| Raglan Holdings Limited | Real estate | 2018 |
| Raid Marketing Ltd | Information & communication | 2025 |
| Railton Ward Limited | Wholesale & retail | 2017 |
| Railway Mortgages Ltd | Extraterritorial | 2018 |
| Rainbow Phoenix Healing Ltd | Health & social care | 2024 |
| Rainer Security Limited | Manufacturing | 2018 |
| Raintherm (ST. Helens) Limited | Manufacturing | 1971 |
| Rajalaxumy Ltd | Hospitality | 2024 |
| RAK Stunts Limited | Arts & recreation | 2025 |
| Rakuba Limited | Administrative & support | 2012 |
| RAM Property Management Ltd | Professional & scientific | 2019 |
| Rama Thirteen Ltd | Hospitality | 2025 |
| Ramball Limited | Real estate | 2017 |
| Rampion Golf Ltd | Wholesale & retail | 2023 |
| Rampy Limited | Information & communication | 2026 |
| Ramsay Lettings Limited | Real estate | 2009 |
| Ramtrad Limited | Wholesale & retail | 2018 |
| Rance Enterprises Limited | Hospitality | 2011 |
| Randall Concepts Limited | Manufacturing | 2009 |
| Randolph Media Ltd | Wholesale & retail | 2020 |
| Randolphuk Ltd | Information & communication | 2019 |
| Randy's Wings Holdings Limited | Financial services | 2017 |
| Rangdonu Spice Ltd | Hospitality | 2019 |
| Range Plant & Advisory Services Ltd | Administrative & support | 2012 |
| Ranya Tutoring Ltd | Education | 2019 |
| Raouf Properties Limited | Real estate | 2003 |
| Rapidformal Property Management Limited | Households | 1996 |
| Rarar Limited | Professional & scientific | 2019 |
| Rasa Property Investment Ltd | Real estate | 2020 |
| Rascal Clothing London Ltd | Wholesale & retail | 2026 |
| Rascal Clothing Ltd | Manufacturing | 2013 |
| Rassasy & the Snug Limited | Hospitality | 2023 |
| Ratcat Productions Limited | Information & communication | 2021 |
| Rated Roofers Ltd | Construction | 2023 |
| Rational Holdings Limited | Administrative & support | 2018 |
| Raue LLP | | 2010 |
| RAW Events Sussex Ltd | Arts & recreation | 2019 |
| RAW Honey MAN Limited | Wholesale & retail | 2023 |
| RAW INK Ltd | Manufacturing | 2025 |
| RAW Material Music and Media Education Limited | Health & social care | 1993 |
| RAW Services (Sussex) Ltd | Water & waste | 2023 |
| RAY Jenkins Training & Consultants Ltd | Professional & scientific | 2009 |
| Rayner Intraocular Lenses Limited | Manufacturing | 1958 |
| Rayner Pharmaceuticals Limited | Wholesale & retail | 2012 |
| Rayner Surgical Group Limited | Professional & scientific | 1910 |
| Rays Hair Academy Ltd | Other services | 2018 |
| RB 88 Limited | Hospitality | 2018 |
| RB Commercial Heating and Electrical Limited | Administrative & support | 2009 |
| Rcxcrafts Limited | Other services | 2024 |
| RDB Carpentry Services Limited | Construction | 2002 |
| RDC Property Holdings Limited | Real estate | 2023 |
| RDJ Care Ltd | Health & social care | 2012 |
| RDM Investment Holdings Limited | Real estate | 2017 |
| RDM Ventures Limited | Professional & scientific | 2014 |
| Rdnt Prospecting Limited | Information & communication | 2013 |
| RE Contractors (Worthing) Ltd | Construction | 2024 |
| Reaching Heights Window Cleaning Services Limited | Other services | 2006 |
| Reactive Arts Ltd | Professional & scientific | 2021 |
| Read Access Ltd | Administrative & support | 2024 |
| Real Civil Engineer Ltd | Information & communication | 2021 |
| Real Estate Law Property Services Limited | Real estate | 2020 |
| Real Gold Productions Limited | Other services | 2007 |
| Real Life Ghost Stories Limited | Information & communication | 2021 |
| Really Scary Books Limited | Arts & recreation | 1992 |
| Rebandy Limited | Financial services | 2003 |
| Rebased Ltd | Manufacturing | 2024 |
| Rebate and Reductions Ltd | Administrative & support | 2013 |