| R.D. Moore Limited | Manufacturing | 1999 |
| R.J.H. Building Construction Ltd | Construction | 1993 |
| RA Glam Collection Limited | Wholesale & retail | 2024 |
| RA Hausworks Ltd | Construction | 2026 |
| Radiant Control Ltd | Manufacturing | 2004 |
| Railean Construction Ltd | Construction | 2024 |
| Rapid Asphalt Products Limited | Mining & quarrying | 2019 |
| Rapid Tractors UK Ltd | Administrative & support | 2007 |
| Rathkenny Properties Ltd | Real estate | 2026 |
| Ravenscraig Town Centre LLP | | 2008 |
| Ravenstonevehiclesales Limited | Wholesale & retail | 2026 |
| Rawa Group Limited | Financial services | 2015 |
| Rawa Investments Limited | Real estate | 2012 |
| Rawa Properties Ltd | Real estate | 2022 |
| RBE Transport Limited | Transport & logistics | 2021 |
| RBJ Distribution Ltd | Wholesale & retail | 2021 |
| RBM CCA Limited | Professional & scientific | 2025 |
| RBY Logistics Limited | Transport & logistics | 2026 |
| RCD Assets Ltd | Real estate | 2021 |
| Rdsd Properties Ltd | Real estate | 2025 |
| RDW Entertainment Limited | Information & communication | 2017 |
| Reactive Access Platforms Ltd | Construction | 2018 |
| Rebecca Riley and Associates Limited | Professional & scientific | 2008 |
| Rebecca Taylor Limited | Administrative & support | 2020 |
| Rebel Resin Craft Ltd | Manufacturing | 2023 |
| Recession Buster Workbooks LLP | | 2013 |
| Red H Property Investments Limited | Real estate | 2019 |
| Red Letter Investments Ltd | Real estate | 2026 |
| Red Letter Properties Ltd | Real estate | 2025 |
| Red LIP Aesthetics Ltd | Health & social care | 2022 |
| Red Rowans Ltd | Financial services | 2019 |
| Red Transport Ltd | Transport & logistics | 2018 |
| Redbourne Builders Limited | Construction | 1981 |
| Redcap Properties Limited | Real estate | 2022 |
| Reddick Windows Ltd | Construction | 2020 |
| Reddington Estates Limited | Real estate | 2016 |
| Reddington Homes Limited | Real estate | 2019 |
| Redsun Innovations Ltd | Information & communication | 2026 |
| Regain Recovery Holdings Limited | Health & social care | 2019 |
| Regal Balti Ltd | Hospitality | 2025 |
| Regroup Scaffolding Ltd | Construction | 2021 |
| Reliant Transport Limited | Transport & logistics | 2010 |
| Relief Milkers.Co.Uk Limited | Agriculture & fishing | 2009 |
| Remac (Midlands) Limited | Manufacturing | 2015 |
| Remac Properties Limited | Real estate | 2018 |
| Remee Rose Ltd | Real estate | 2025 |
| Remote Device Technology Limited | Information & communication | 2007 |
| Rempstone White Lion Limited | Hospitality | 2016 |
| Rennocks Financial Planning Ltd | Professional & scientific | 2020 |
| REP Trans Services Ltd | Transport & logistics | 2021 |
| Requip Supplies Limited | Mining & quarrying | 1991 |
| Rescue Haulage Limited | Transport & logistics | 2020 |
| Resellreserve Limited | Arts & recreation | 2025 |
| Resilient Power Solutions Limited | Construction | 2014 |
| Resource Partner Ltd | Professional & scientific | 2020 |
| Restored Properties Limited | Extraterritorial | 1941 |
| Retail Design and Display Company Limited | Manufacturing | 2003 |
| Rethink ME - Laser Tattoo Removal Ltd | Other services | 2017 |
| Revamp Construction Limited | Financial services | 2015 |
| Revillation Aesthetics Ltd | Other services | 2025 |
| Revive Environmental UK Holdings Limited | Financial services | 2023 |
| RF Distribution Solutions Ltd | Transport & logistics | 2020 |
| RG Decorators (UK) Ltd | Construction | 2015 |
| Richard Spooner Associates Ltd | Professional & scientific | 2015 |
| Richi Tomica Ltd | Wholesale & retail | 2016 |
| Ricts Ltd | Information & communication | 2021 |
| Ridha Limited | Professional & scientific | 2012 |
| Ripplewave Ltd | Financial services | 2002 |
| Rivark Ltd | Real estate | 2021 |
| Riverside Exchange Management Company Limited | Households | 2001 |
| RKM Plumbing & Heating Services Ltd | Construction | 2025 |
| RLDIRECT4U Ltd | Transport & logistics | 2016 |
| RM O'Mara Ltd | Health & social care | 2023 |
| RMK Haulage Ltd | Transport & logistics | 2020 |
| Roadforce Trans Ltd | Transport & logistics | 2025 |
| Roadtrackshow Ltd | Wholesale & retail | 2024 |
| Robert J Jones Ltd | Professional & scientific | 2014 |
| Robert Mulonga Limited | Construction | 2016 |
| Roberts Travel Group Limited | Transport & logistics | 2012 |
| Robo Property LLP | | 2025 |
| Robo Trading Ltd | Education | 2025 |
| Roca Limited | Wholesale & retail | 1992 |
| Rockfordd Care Limited | Health & social care | 2010 |
| Rockhopper Production Services Limited | Information & communication | 2026 |
| Rockstar Vape Ltd | Wholesale & retail | 2017 |
| Roland Bardsley Homes Limited | Construction | 2004 |
| Romulus Management Company Limited | Construction | 2005 |
| Ronny Transport Limited | Transport & logistics | 2025 |
| Roope Family and Co Limited | Extraterritorial | 2025 |
| Rootedbymorganoak Ltd | Health & social care | 2026 |
| Roots to Roofs U.K Ltd | Construction | 2025 |
| Rootsroutes Limited | Administrative & support | 2013 |
| Rosedale Care Home Ltd | Health & social care | 2004 |
| Rothley House Ltd | Real estate | 2016 |
| Rotorysmith Ltd | Transport & logistics | 2023 |
| ROY Pett Limited | Financial services | 2013 |
| Royal Priesthood Jakus Home Care Services Ltd | Health & social care | 2023 |
| ROZ Rapp Ltd | Education | 2025 |
| Rsengineeringontractors Ltd | Manufacturing | 2018 |
| Ruemas Limited | Administrative & support | 2013 |