| Rockshore Building Group Ltd | Construction | 2024 |
| Rockwell Pictures Limited | Professional & scientific | 2004 |
| Rodders on the Run Ltd | Information & communication | 2022 |
| Roderick Stanley Ltd | Professional & scientific | 2020 |
| Roffey Football Club Limited | Arts & recreation | 2026 |
| Roffey Homes Limited | Construction | 1960 |
| ROG Properties Limited | Real estate | 2001 |
| Rokador Healthcare Limited | Health & social care | 2022 |
| Roll From the HIP LLP | | 2025 |
| Romac International Sourcing Limited | Wholesale & retail | 2006 |
| Roman Content Consulting Ltd | Wholesale & retail | 2021 |
| Romanian Drinks Limited | Wholesale & retail | 2023 |
| Romcom Consulting Ltd | Extraterritorial | 2012 |
| Romello Construction Limited | Construction | 2021 |
| Romney Court Management Co. (Worthing) Limited | Real estate | 2000 |
| Ronber Contractors Limited | Construction | 1969 |
| ROO Coffee Ltd | Hospitality | 2025 |
| Roobarb Limited | Extraterritorial | 2024 |
| Roofworks Sussex Ltd | Construction | 2025 |
| Rook Studio Ltd | Other services | 2025 |
| Rookery Fit Farm Limited | Arts & recreation | 2014 |
| Roomed Developments Ltd | Real estate | 2019 |
| ROOT12 Ltd | Education | 2018 |
| Roots Coliving Ltd | Real estate | 2023 |
| Rope Walk Beach Kiosk Limited | Hospitality | 2026 |
| Rope Walk Beach West Kiosk Limited | Hospitality | 2026 |
| Roscomac Group Limited | Financial services | 2017 |
| Rose Cubes Design Ltd | Information & communication | 2014 |
| Rose Dell Flat Management Limited | Households | 1993 |
| Rose Tech LED Services Limited | Information & communication | 2018 |
| Rosebank Industries Holdings Limited | Financial services | 2023 |
| Rosebud Cloud Solutions Ltd | Information & communication | 2022 |
| Rosebud Property Solutions Ltd | Real estate | 2023 |
| Rosedale Funeral Service Ltd | Other services | 2012 |
| Rosemary Collins Associates Limited | Administrative & support | 2010 |
| Rosemont Equity Partners Ltd | Financial services | 2026 |
| Rossetts (UK) Limited | Wholesale & retail | 2008 |
| Rossi Estates Ltd | Construction | 2024 |
| ROT Wine Consulting Limited | Professional & scientific | 2013 |
| Rounce Funeral Services Limited | Other services | 2015 |
| Roundfern Limited | Real estate | 1991 |
| Rountree Fine Art Limited | Administrative & support | 2013 |
| Rountree Tryon Galleries Limited | Wholesale & retail | 2009 |
| Route One Network Limited | Education | 2012 |
| ROW Limited | Information & communication | 2014 |
| Rowebuck Stud Limited | Other services | 2018 |
| Rowland Financial Services Limited | Financial services | 2012 |
| ROY Grace Limited | Information & communication | 2010 |
| Royal Oak Friday Street Limited | Extraterritorial | 2006 |
| Royale Recovery Services Ltd | Transport & logistics | 2025 |
| RPJ 100 Limited | Professional & scientific | 2018 |
| RPR Properties Ltd | Real estate | 2014 |
| Rrio Construction Limited | Construction | 2015 |
| RS M & M Limited | Households | 1996 |
| RSA Catering Ltd | Hospitality | 2012 |
| RSC Associates Ltd | Professional & scientific | 2005 |
| Rsjp Somerset Ltd | Construction | 2020 |
| Rsolvd Limited | Wholesale & retail | 2023 |
| Rssk Ltd | Other services | 2021 |
| RTA Engineering Ltd | Professional & scientific | 2011 |
| Rtrn Ltd | Information & communication | 2026 |
| Rt’S Touch Limited | Construction | 2025 |
| Rubik Designs Limited | Administrative & support | 2010 |
| Rubs Interior Design and Fixing Ltd | Other services | 2017 |
| Ruby MAY Spencer Ltd | Information & communication | 2017 |
| Rucko Limited | Information & communication | 2018 |
| Rude Fruit Ltd | Wholesale & retail | 2019 |
| RUG Doctor Limited | Administrative & support | 1981 |
| Rui.Pereira Health Ltd | Health & social care | 2019 |
| RUM and Raisin Limited | Real estate | 2023 |
| Rumi Kitchen Ltd | Hospitality | 2026 |
| Run Things Ltd | Arts & recreation | 2018 |
| Runbase Limited | Arts & recreation | 2025 |
| Rupert Grenville & Co Limited | Financial services | 2025 |
| Rusa Consulting Limited | Real estate | 2006 |
| Rushcrest Holdings Ltd | Professional & scientific | 2006 |
| Rushcrest Limited | Real estate | 1999 |
| Rusper and Pines Limited | Wholesale & retail | 2019 |
| Rusper Leisure Limited | Arts & recreation | 1999 |
| Russcarl Composites Ltd | Manufacturing | 2015 |
| Russell's Mobility & Care Shop Ltd | Wholesale & retail | 2014 |
| Russell's Swim School Ltd | Education | 2024 |
| Russells Developments Limited | Professional & scientific | 2006 |
| Rustage Ltd | Information & communication | 2019 |
| Rustage Properties Ltd | Real estate | 2023 |
| Rustington Manor FMC Limited | Real estate | 2025 |
| Rustington Windows Upvc Limited | Construction | 1989 |
| Ruyi LDT Limited | Other services | 2017 |
| RVB Transcendence Limited | Real estate | 2020 |
| RVS Videovision Limited | Information & communication | 2008 |
| Ryan John Business Services Limited | Professional & scientific | 2018 |
| Ryzex Limited | Households | 2014 |
| Rzepa Consulting Limited | Professional & scientific | 2018 |
| S & G Caravan Services Ltd | Manufacturing | 2012 |
| S & K Haulage Limited | Administrative & support | 2015 |
| S & L Locksmiths Ltd | Administrative & support | 2023 |
| S E Fuels Ltd | Wholesale & retail | 2023 |
| S Farrell Construction Limited | Construction | 2014 |
| S G D Property Investment Limited | Professional & scientific | 2006 |
| S Glynn Contractors Limited | Construction | 2016 |