| Romini Ltd | Real estate | 2024 |
| Ronnie Catering Ltd | Hospitality | 2019 |
| Ronnie Construction Limited | Real estate | 2021 |
| Roofcladding Ltd | Construction | 2019 |
| Roofing & Cladding Southern Limited | Construction | 2021 |
| Room Renovation Ltd | Construction | 2019 |
| Roomroots Ltd | Real estate | 2018 |
| Rooms in Cambs Limited | Real estate | 2016 |
| Rooms of Distinction Limited | Real estate | 2008 |
| Roose Shire Homes Limited | Real estate | 2021 |
| Root AV Ltd | Construction | 2024 |
| Roots 4 Business Limited | Professional & scientific | 2023 |
| Roots Media Management Ltd | Information & communication | 2024 |
| Rootsman Productions Ltd | Information & communication | 2020 |
| Rope Quays (Harlequin Court) RTM Company Ltd | Households | 2015 |
| Rope Quays (Jacana Court) RTM Company Limited | Households | 2013 |
| Rope Quays (Sanderling Lodge) RTM Company Ltd | Households | 2015 |
| Rosalind Mary Medical Ltd | Administrative & support | 2012 |
| Roscoe Property Holdings Limited | Real estate | 2020 |
| Rose Green Flooring Ltd | Construction | 2021 |
| Rose in Eden Ltd | Wholesale & retail | 2021 |
| Rose Lovell Investments Limited | Real estate | 2019 |
| Rose's Pleasure Parks Limited | Arts & recreation | 1956 |
| Roseeva Properties Limited | Real estate | 2021 |
| Roseking Ltd | Wholesale & retail | 2025 |
| Rosemartin Ltd | Other services | 2020 |
| Rosetta (Psmd) Property Company Ltd | Real estate | 2013 |
| Rosetta Property Company Ltd | Real estate | 2020 |
| Rosewood Carpentry & Developments Ltd | Construction | 2021 |
| Rosina Apartments IOW Ltd | Real estate | 2026 |
| Rosky Limited | Transport & logistics | 2023 |
| Rossiter Ocean Rowing Boats Limited | Extraterritorial | 2023 |
| Rotating Solutions Limited | Manufacturing | 2018 |
| Rotech Holdings I.W Ltd | Real estate | 2020 |
| Rotherham Academic Press Ltd | Information & communication | 2023 |
| Roulland Carpentry Limited | Construction | 2006 |
| Rowan H Ltd | Information & communication | 2026 |
| Rowe's Consultants and Design Limited | Professional & scientific | 2014 |
| Rowlands Plant Holdings Limited | Financial services | 2012 |
| Rowlands Plant Services Limited | Administrative & support | 1955 |
| Rowley Aluminium Ltd | Construction | 2015 |
| Roxandra Shop Ltd | Wholesale & retail | 2017 |
| Roxwell Property Ltd | Real estate | 2018 |
| Royal Marines Museum | Arts & recreation | 2011 |
| Royal Navy Museums | Arts & recreation | 2008 |
| Royal Navy Rugby Union | Arts & recreation | 2015 |
| Royal Navy Submarine Museum | Arts & recreation | 2011 |
| Royale Drives Ltd | Construction | 2020 |
| Rozy.R Ltd | Hospitality | 2026 |
| RP AC & Electrical Ltd | Construction | 2026 |
| RPM International Limited | Real estate | 2018 |
| RPT Projects Limited | Professional & scientific | 2015 |
| RR Install Limited | Construction | 2026 |
| RRS Storage & Distribution Limited | Administrative & support | 2019 |
| RS Consultancy and Trading Ltd | Wholesale & retail | 2018 |
| RS Divers Limited | Other services | 2008 |
| RS Enterprise Consulting Limited | Information & communication | 2016 |
| RS Outboards Limited | Manufacturing | 2003 |
| RS Specialist Contractors Ltd | Construction | 2025 |
| RS84 Construction Limited | Construction | 2021 |
| RSD Design & Consultancy Ltd | Construction | 2026 |
| Rsdigitalventures Ltd | Information & communication | 2023 |
| RSH Consultancy Limited | Professional & scientific | 2019 |
| RSH Flooring Ltd | Construction | 2021 |
| RSU (Southern) Limited | Construction | 2006 |
| RT Holdings Group Limited | Financial services | 2025 |
| Rtiyg Limited | Administrative & support | 2015 |
| Rtiyg Marketing Limited | Administrative & support | 2016 |
| RTS Transfers Limited | Transport & logistics | 2025 |
| Rubana Ltd | Wholesale & retail | 2022 |
| Rubatal Construction Ltd | Construction | 2026 |
| Ruddy Esports Ltd | Education | 2022 |
| Rudmore Court RTM Company Limited | Households | 2010 |
| Rudra Retails Ltd | Wholesale & retail | 2023 |
| Ruler Property Ltd | Construction | 2002 |
| Rumahku Limited | Real estate | 2020 |
| Rumahku SA Limited | Real estate | 2023 |
| Rumana Tandoori Limited | Hospitality | 2019 |
| Rumstone Estates Ltd | Administrative & support | 2003 |
| RUN4U Limited | Transport & logistics | 2019 |
| Rundle Holdings Limited | Wholesale & retail | 1982 |
| Runmax Limited | Wholesale & retail | 2024 |
| Runway Three Enterprises Limited | Real estate | 2018 |
| Rupilda Ltd | Real estate | 2025 |
| Rupjan Property Ltd | Real estate | 2022 |
| Ruptureseal UK Limited | Wholesale & retail | 2012 |
| Russ Motorcycle Tyres Ltd | Wholesale & retail | 2015 |
| Russ Tyres Ltd | Wholesale & retail | 2025 |
| Russell Griggs Catering Ltd | Hospitality | 2024 |
| Russell Wall Building and Landscaping Limited | Construction | 2016 |
| Russell's Leisure Services Limited | Hospitality | 2002 |
| Russell's Mobile Catering Limited | Hospitality | 2004 |
| Rusty Rails Limited | Manufacturing | 2016 |
| Ruth Court (Southsea) Limited | Hospitality | 1969 |
| Ruth Seymour Healthcare Services Ltd | Administrative & support | 2017 |
| Ruthless Consulting Ltd | Administrative & support | 2023 |
| Ruttle Property Services Limited | Real estate | 2025 |
| RVM Heating Ltd | Construction | 2023 |
| RW Air Energy Ltd | Professional & scientific | 2015 |
| RW Groundworks Ltd | Construction | 2026 |