| Roadhouse Fusion Ltd | Hospitality | 2025 |
| Roadlight -Specialist Residential Services Ltd | Health & social care | 2025 |
| Roadlight Ltd | Education | 2017 |
| Roadmap Heroes Ltd | Professional & scientific | 2016 |
| Roadmapping Technology Limited | Information & communication | 2003 |
| Roadmita Transport Ltd | Transport & logistics | 2024 |
| Roap UK Limited | Wholesale & retail | 2025 |
| ROB a Heating and Plumbing Engineer Ltd | Energy | 2018 |
| ROB Pearce Personal Training Ltd | Other services | 2014 |
| ROB Walker Racing Team Limited | Professional & scientific | 2004 |
| Robar Ltd | Financial services | 2024 |
| Robert Kirby Professional Building Services Limited | Construction | 2007 |
| Robertsons Estate Agents Limited | Real estate | 2009 |
| Robiekays Ltd | Health & social care | 2022 |
| Robinson Land and Property Limited | Real estate | 2023 |
| Robinson Refurbishments Ltd | Other services | 2022 |
| Robotic Farm Systems Ltd | Manufacturing | 2018 |
| Robstel Building Ltd | Construction | 2024 |
| Roccola Hair Limited | Other services | 2018 |
| Rochem International Limited | | 1973 |
| Rock Aviation Services Ltd | Professional & scientific | 2017 |
| Rock City Masons Limited | Construction | 2024 |
| Rock of Ages Limited | Real estate | 2021 |
| Rockell Seymour Ltd | Professional & scientific | 2024 |
| Rocky Pierre Ltd | Wholesale & retail | 2013 |
| Rocyp Transport Services Ltd | Transport & logistics | 2019 |
| ROD Bristow Education Limited | Education | 2021 |
| Roda Property Services Ltd | Administrative & support | 2022 |
| Rodatrans Ltd | Transport & logistics | 2022 |
| Roddy Williams Limited | Agriculture & fishing | 2000 |
| Rodentia Technologies Ltd | Information & communication | 2024 |
| ROE Electronics Limited | Wholesale & retail | 1976 |
| Roehrig & Co Limited | Hospitality | 1997 |
| Roger Oliver Consulting Engineers Ltd | Administrative & support | 2020 |
| Roger's Tree & Garden Services Ltd | Other services | 2002 |
| Rogers Plumbing and Hvac Ltd | Construction | 2024 |
| Rohantech Solutions Limited | Information & communication | 2007 |
| Rokil CIC | Education | 2023 |
| Rolling Sets Limited | Manufacturing | 2010 |
| Rollins IP Strategies Ltd. | Professional & scientific | 2014 |
| Roman MEP Ltd | Construction | 2026 |
| Roman Services Limited | Construction | 2022 |
| Romanian Legal Support CIC | Administrative & support | 2025 |
| Romans Decorating Limited | Construction | 2025 |
| Romans Gate (Old Stratford) Residents Association Limited | Professional & scientific | 2003 |
| Romsey Consultancy Limited | Professional & scientific | 2022 |
| Roofline (High Wycombe) Limited | Wholesale & retail | 2005 |
| Room 478 Ltd | Other services | 2021 |
| Rooney Home Developments Ltd | Real estate | 2022 |
| Rory Gibbs Limited | Arts & recreation | 2025 |
| Rosa One Ltd | Health & social care | 2026 |
| Roschet Media Limited | Wholesale & retail | 2011 |
| Rose Accountancy Solutions Ltd | Extraterritorial | 2022 |
| Rose and Martlet Ltd | Wholesale & retail | 2023 |
| Rose Avenue (Woodford) Management Limited | Households | 2000 |
| Rose Barn 57 Limited | Arts & recreation | 2014 |
| Rose Blossom Care Agency Ltd | Health & social care | 2025 |
| Rose Fire & Security Limited | Administrative & support | 2002 |
| Rose Island Travel Ltd | Wholesale & retail | 2025 |
| Rose Publishing Ltd | Information & communication | 2023 |
| Rosebery Medical Services Ltd | Health & social care | 2018 |
| Rosedale Environmental Ltd | Wholesale & retail | 2021 |
| Rosehill Properties Limited | Real estate | 2025 |
| Rosemarch Limited | Financial services | 2006 |
| Rosemount Accountancy Bucks Ltd | Professional & scientific | 2022 |
| Ross Murray Tennis Limited | Education | 2023 |
| Ross Services Ltd | Information & communication | 2023 |
| Rossetti Developments Limited | Construction | 2010 |
| Roundwood Enterprises Ltd | Construction | 2012 |
| ROUTE1 Pharma Limited | Wholesale & retail | 2020 |
| Routecheck Ltd | Information & communication | 2026 |
| Rovale Homes Limited | Real estate | 2004 |
| Roveto LLP | | 2025 |
| Roy's Rotis & More Ltd | Hospitality | 2025 |
| Royal Cars (Bucks) Ltd | Transport & logistics | 2021 |
| Royal Cars Autocentre Limited | Wholesale & retail | 2023 |
| Royal Grammar School High Wycombe | Education | 2011 |
| Royale Chilli Ltd | Hospitality | 2025 |
| RP Consulting Services Limited | Professional & scientific | 2009 |
| RP Developments Limited | Real estate | 2006 |
| RP Europe Solutions Limited | Wholesale & retail | 2012 |
| RP Property Services Ltd | Construction | 2015 |
| RP Tech Ltd | Information & communication | 2015 |
| RPE (UK) Limited | Real estate | 2006 |
| RPL Group Services Ltd | Extraterritorial | 2025 |
| Rpsa Investments Limited | Real estate | 2025 |
| RR20 Ltd | Information & communication | 2025 |
| Rram Technology Solutions Ltd | Information & communication | 2025 |
| RRH Logistics Ltd | Transport & logistics | 2026 |
| RSA Property Services Ltd | Real estate | 2015 |
| Rsclayton Consulting Ltd | Information & communication | 2014 |
| RSG Trading Ltd | Manufacturing | 2021 |
| RSH Tech Consultants Ltd | Professional & scientific | 2013 |
| RSK & Sons Ltd | Other services | 2011 |
| RSK Consult Ltd | Professional & scientific | 2025 |
| Rsra Invest Ltd | Real estate | 2024 |
| RTI Investments Ltd | Financial services | 2014 |
| RTJ Employee Ownership Limited | Professional & scientific | 2013 |
| RTJ Trustee Services Limited | Administrative & support | 2025 |
| RTL Technology Ltd | Information & communication | 2016 |