| ROQ Pharma Limited | Wholesale & retail | 2022 |
| Rory Keen Ltd | Construction | 2018 |
| Rosann Limited | Real estate | 2025 |
| Rosary Business Park Limited | Construction | 2026 |
| Rosco GAS Ltd | Construction | 2019 |
| Rose Analytics Ltd | Professional & scientific | 2023 |
| Rose Day Court Limited | Households | 1996 |
| Rose Garden Rooms Limited | Construction | 2025 |
| Rose of Sharon Good Choice Ltd | Health & social care | 2021 |
| Rose Property Consultancy Limited | Wholesale & retail | 2018 |
| Rose Road Management Company Limited | Households | 2007 |
| Rosebay Resources Limited | Other services | 2011 |
| Rosechem Ltd | Wholesale & retail | 2020 |
| Rosedale Roofing & Building Limited | Construction | 2025 |
| Rosehill Garage (Waltham Chase) Limited | Wholesale & retail | 1963 |
| ROSEMART99 Services Limited | Health & social care | 2016 |
| Rosemary House Limited | Hospitality | 2005 |
| Rosemead Developments Limited | Construction | 1985 |
| Rosemont House Limited | Other services | 2003 |
| Rosendale Products Limited | Wholesale & retail | 2025 |
| Rosethorn Properties Limited | Real estate | 2011 |
| Rosewarne Court Association Limited | Households | 1979 |
| Rosewood Estates Ltd | Administrative & support | 2016 |
| Rosewood Management (BW) Limited | Professional & scientific | 2011 |
| Roshan Stores Limited | Wholesale & retail | 2025 |
| Rosianu Ltd | Transport & logistics | 2024 |
| Rosice GAS Services Ltd | Construction | 2025 |
| Rosie & Bobby Ltd | Real estate | 2025 |
| Rosie and Rara Limited | Manufacturing | 2023 |
| Rosie's Memories Ltd | Wholesale & retail | 2025 |
| Rosmira Ltd | Wholesale & retail | 2025 |
| Ross Cranfield Limited | Hospitality | 1998 |
| Ross Maynard Limited | Construction | 2014 |
| Ross Mews (Management) Limited | Households | 1973 |
| Ross PUB Co Ltd | Hospitality | 2023 |
| Ross Smither Sealants Ltd | Construction | 2011 |
| Ross Young Photographers Limited | Professional & scientific | 1997 |
| Ross&Langley Ltd | Professional & scientific | 2021 |
| Rosscare Limited | Information & communication | 2024 |
| Rosser Health Ltd | Health & social care | 2022 |
| Rossi Hair & Beauty Limited | Other services | 2003 |
| Rossi Holdings Fareham Limited | Financial services | 2020 |
| Rostom Ltd | Health & social care | 2015 |
| Rota Support Services Ltd | Other services | 2019 |
| Rotarylogic Limited | Manufacturing | 2010 |
| Rothmans Audit LLP | | 2019 |
| Rothmans Corporate Finance Limited | Extraterritorial | 2019 |
| Rothmans LLP | | 2019 |
| Rothwell Dene Management Company Limited | Households | 1997 |
| Rottconn LLP | | 2021 |
| Round the Isle CIC | Arts & recreation | 2026 |
| Roundhouse EOT Limited | Financial services | 2023 |
| Roundhouse Financial Services (London) Limited | Financial services | 2016 |
| Roundhouse FS Holdings Ltd | Financial services | 2020 |
| Rouse Acquisitionco Limited | Financial services | 2017 |
| Rouse Construction Services Limited | Construction | 2020 |
| Route 42 Ltd | Professional & scientific | 2022 |
| Route 66 Property Group Ltd | Real estate | 2026 |
| Route Safe Limited | Administrative & support | 2025 |
| Routyn UK Limited | Information & communication | 2018 |
| ROV Media Ltd | Transport & logistics | 2024 |
| Rovexa Management Ltd | Administrative & support | 2010 |
| Rowan Hayward Trading Limited | Agriculture & fishing | 2013 |
| Rowan House RTM Company Limited | Real estate | 2013 |
| Rowe Roofing Developments Ltd | Construction | 2014 |
| Rowe Water Logistics Ltd | Professional & scientific | 2023 |
| Rowell Properties Ltd | Real estate | 2025 |
| Rowlatech Ltd | Professional & scientific | 2020 |
| Rowles (Chandlers Ford) Limited | Wholesale & retail | 1985 |
| Rowles Accountancy Services Limited | Professional & scientific | 2020 |
| Rowles Picador Limited | Wholesale & retail | 1951 |
| Rownhams Bedding & Furniture Centre Limited | Wholesale & retail | 1977 |
| ROX Transport Ltd | Transport & logistics | 2026 |
| Roxan Construction Limited | Construction | 1985 |
| Roxan Homes Limited | Real estate | 1995 |
| Roxby Garage Limited | Wholesale & retail | 2005 |
| Roxo Enterprises Ltd | Wholesale & retail | 2024 |
| Royal Clarence Marina Limited | Professional & scientific | 2002 |
| Royal Court Property Management Ltd. | Real estate | 2015 |
| Royal Southern Yacht Club Limited | Arts & recreation | 2005 |
| Royal Southern Yacht Club Trust | Other services | 2007 |
| Royal Victoria Railway Limited | Extraterritorial | 2009 |
| Royalcode Limited | Construction | 1978 |
| Royale Home Solutions Limited | Construction | 2025 |
| Royale Medical Concierge Ltd | Wholesale & retail | 2020 |
| Royale Park Estates Limited | Hospitality | 2015 |
| Royale Park Home Estates Limited | Real estate | 2001 |
| Royale Parks (Cheshire) Limited | Hospitality | 2008 |
| Royale Parks (Christchurch) Limited | Hospitality | 2016 |
| Royale Parks (Devon) Limited | Hospitality | 2016 |
| Royale Parks (Dolton) Limited | Hospitality | 2016 |
| Royale Parks (Dorset) Limited | Hospitality | 2016 |
| Royale Parks (Reculver) Limited | Hospitality | 2007 |
| Royl Electrical Ltd | Construction | 2026 |
| Royle Hobbs Construction Limited | Construction | 1997 |
| Roynon Creatives CIC | Education | 2023 |
| Roynon Performing Arts Ltd | Education | 2025 |
| Rozbe Ltd | Transport & logistics | 2018 |
| Rozel Breeding Centre Ltd | Agriculture & fishing | 2012 |
| Rozel Estates Rentals Ltd | Real estate | 2025 |