| Rorem Financial Ltd | Professional & scientific | 2012 |
| Rosali House Management Company Limited | Households | 2007 |
| Roscott Holdings Limited | Financial services | 2025 |
| Rose Cleaning and Delivery Services Ltd | Administrative & support | 2025 |
| Rose Court Limited | Households | 2003 |
| Rose Nichols Ltd | Information & communication | 2024 |
| Rosebean Limited | Hospitality | 2019 |
| Rosehill Innovations Ltd | Manufacturing | 2015 |
| Rosemary Ryan Limited | Professional & scientific | 2006 |
| Rosemont Building Contractors Limited | Construction | 2026 |
| Rosemonte Holdings Limited | Real estate | 2023 |
| Rosetta Gardening Limited | Administrative & support | 2025 |
| ROSHAN21 Ltd | Hospitality | 2025 |
| Roslyn Management Company (IOW) Limited | Real estate | 2011 |
| Ross Aviation Limited | Wholesale & retail | 1996 |
| Ross Group (IW) Limited | Real estate | 2014 |
| Ross IOW Fabrications Ltd | Construction | 2016 |
| Ross Lettings (IW) Limited | Real estate | 1964 |
| Rosscatt Limited | Construction | 2011 |
| Rosvio Ltd | Real estate | 2025 |
| Rougemont School Activities Limited | Arts & recreation | 1994 |
| Rougemont School Trust Limited | Education | 1974 |
| Rougestar Ltd | Financial services | 2010 |
| Roundhouse Care Group Limited | Financial services | 2021 |
| Roundhouse Care Limited | Health & social care | 2009 |
| Rouse Limited | Financial services | 1998 |
| Routing Ltd | Transport & logistics | 2025 |
| Roving Sommelier Limited | Extraterritorial | 2012 |
| Roving Sommelier Worldwide Limited | Extraterritorial | 2013 |
| Rowan Shaw Estate Management Ltd | Real estate | 2026 |
| Rowecord Holdings Limited | Professional & scientific | 1992 |
| Royal Artillery Yacht Club | Arts & recreation | 2016 |
| Royal Crescent Management Company Limited | Households | 1989 |
| Royal Hotel Holdings Limited | Administrative & support | 1945 |
| Rozithekitton Limited | Financial services | 2022 |
| RP 606 Limited | Financial services | 2011 |
| RP Top Co Group Limited | Real estate | 2025 |
| RP620 Limited | Construction | 2018 |
| RPC Scaffolding Limited | Construction | 2026 |
| RPD Building Consultants Limited | Professional & scientific | 2009 |
| Rpduk Construction Limited | Construction | 2025 |
| RPL9 Ltd | Health & social care | 2026 |
| RRA Project Services Ltd | Professional & scientific | 2025 |
| RRK Traders Ltd | Wholesale & retail | 2024 |
| RS Newport Limited | Hospitality | 2022 |
| RS Ventilation Services Limited | Professional & scientific | 2024 |
| RS Wellness Limited | Manufacturing | 2021 |
| Rsbj Foods Ltd | Hospitality | 2024 |
| RSG Link Ltd | Transport & logistics | 2025 |
| RSI Computer Systems Ltd | Manufacturing | 2026 |
| RSO Secretaries Limited | Arts & recreation | 1976 |
| RT & JA Property Ltd | Real estate | 2023 |
| RT Underwood Plumbing Ltd | Construction | 2025 |
| RTA Rail Limited | Construction | 2019 |
| RTR Express Ltd | Administrative & support | 2018 |
| Ruban's Trading Ltd | Wholesale & retail | 2024 |
| Rubber Duck Data Ltd | Information & communication | 2023 |
| Rubicon Mobile Ltd | Information & communication | 2005 |
| Ruchikoottu Ltd | Hospitality | 2026 |
| Ruellha Limited | Financial services | 2025 |
| Rufco Limited | Professional & scientific | 2009 |
| Rufta Ltd | Wholesale & retail | 2021 |
| Rugby Fit Limited | Education | 2013 |
| Rugby Surgery Doctors Ltd | Health & social care | 2021 |
| Runishas Beauty Station Ltd | Other services | 2025 |
| Runners Rewards Ltd | Other services | 2024 |
| Runwave Limited | Information & communication | 1986 |
| Ruperra Courtyard and Stables Events Ltd | Hospitality | 2024 |
| Rushar Limited | Manufacturing | 1996 |
| Rushgreen Catering Ltd | Hospitality | 2018 |
| Rushworth Montague Interiors Ltd | Manufacturing | 2019 |
| Russell Edwards & Sons Ltd | Construction | 2015 |
| Russellthomson Ltd | Construction | 2014 |
| Rusty Will Limited | Wholesale & retail | 2006 |
| Ruxwebb Limited | Professional & scientific | 2021 |
| Ruya Studio Limited | Information & communication | 2021 |
| Rval Lettings and Management Limited | Real estate | 2026 |
| RW Auto Specialist Ltd | Wholesale & retail | 2019 |
| RW Electrical (South Wales) Ltd | Construction | 2021 |
| RWG Radiology Limited | Health & social care | 2019 |
| RWH Holdings Limited | Financial services | 2020 |
| RWH Roofing (Wales) Limited | Administrative & support | 2017 |
| RWP Projects Limited | Financial services | 2021 |
| Rwwtm Ltd | Construction | 2025 |
| Ry's Dog Trading Services Limited | Other services | 2022 |
| Ryan Harris Floor Screeding Group Limited | Construction | 2026 |
| Ryan’Sdeliveries Ltd | Transport & logistics | 2025 |
| Rychris Court Residents Company Limited | Real estate | 2002 |
| Ryehill Investments Ltd | Real estate | 2005 |
| Ryehill Sporting Ltd | Agriculture & fishing | 2017 |
| Ryno Site Management Services Limited | Construction | 2025 |
| S & D Elite Cleaning Solutions Ltd | Administrative & support | 2023 |
| S & D Extraction Ltd | Manufacturing | 2016 |
| S & D Marine Interiors Ltd | Extraterritorial | 2013 |
| S & D Sealants Limited | Construction | 2002 |
| S & E Properties Portfolio Ltd | Real estate | 2021 |
| S & J Autoservices Limited | Wholesale & retail | 2016 |
| S & J MAY Refrigeration Limited | Manufacturing | 2000 |
| S & M Stores (NPT) Ltd | Wholesale & retail | 2020 |
| S & M Super Store Ltd | Wholesale & retail | 2018 |