| Roomystays Ltd | Real estate | 2024 |
| Roosquared Limited | Real estate | 2010 |
| Roost Cleaning Company Limited | Administrative & support | 2024 |
| Roost Furnishings Limited | Other services | 2024 |
| Rootbridge Capital Limited | Financial services | 2000 |
| ROOTLET68 Limited | Information & communication | 2018 |
| Roots and Shoots Learning CIC | Education | 2025 |
| Roots Hair Ltd | Wholesale & retail | 2026 |
| Roo’S Corner Ltd | Wholesale & retail | 2025 |
| Ropheka Services Ltd | Health & social care | 2023 |
| ROQ RAW Radio Limited | Information & communication | 2022 |
| Roque Almeida Ltd | Real estate | 2021 |
| Rora Ltd | Professional & scientific | 2024 |
| Rorebim Konsultancy Services Ltd | Administrative & support | 2016 |
| Rory Woodhouse Ltd | Professional & scientific | 2020 |
| Rose Hill Camping Ltd | Hospitality | 2021 |
| Rose Moon Group Ltd | Real estate | 2026 |
| Rose Street Partners Limited | Financial services | 2023 |
| Rose Tree Surgeons Limited | Administrative & support | 2021 |
| Rose Violet Ltd | Professional & scientific | 2019 |
| Rosebeam Ltd | Health & social care | 2024 |
| Rosebery Trading (High Wycombe) Limited | Real estate | 1954 |
| Roseboro Limited | Professional & scientific | 2014 |
| Rosebud Global Ltd | Professional & scientific | 2025 |
| Roseco Experiences Ltd | Hospitality | 2026 |
| Rosegem Property Limited | Real estate | 2016 |
| Rosetta Nail & Beauty Ltd | Other services | 2019 |
| Rosewin Cleaning Limited | Administrative & support | 2025 |
| Rosewood Property Management and Lettings Ltd | Real estate | 2026 |
| Rosewood Residence Investment Limited | Real estate | 2020 |
| Rosewoods Care Home Limited | Health & social care | 2026 |
| ROSHANI13 Limited | Administrative & support | 2023 |
| Roshen Process Solutions Limited | Wholesale & retail | 2023 |
| Rosie Medical Group Ltd | Professional & scientific | 2023 |
| Rosleang Property Solutions Ltd | Real estate | 2018 |
| Rosnar Group Ltd. | Wholesale & retail | 2017 |
| Rospardo MCT Limited | Manufacturing | 2019 |
| Ross Duffin Financial Solutions Ltd | Administrative & support | 2018 |
| Ross Osborne Properties Limited | Real estate | 2018 |
| Rosser Property Solutions Ltd | Construction | 2023 |
| Rotary Construction Limited | Professional & scientific | 2002 |
| Rotate Gymnastics Club Ltd | Arts & recreation | 2022 |
| Rotex Limited | Construction | 2018 |
| Rother Valley Golf Centres Limited | Arts & recreation | 1994 |
| Rotherfield Buckingham Management Limited | Households | 2006 |
| Rouge Homes Ltd | Real estate | 2017 |
| Rougier Street Developments Ltd | Real estate | 2017 |
| Round Table Post Production Ltd | Information & communication | 2008 |
| Roundabout Properties Limited | Real estate | 2018 |
| Roundwood Developments Limited | Real estate | 1964 |
| Route Logistics Ltd | Transport & logistics | 2005 |
| Routeco Group Holdings Limited | Wholesale & retail | 2010 |
| Routeco Limited | Wholesale & retail | 1976 |
| Rouvisite Limited | Wholesale & retail | 2022 |
| Rova Investments Limited | Real estate | 2023 |
| Rovar Technologies Ltd | Information & communication | 2025 |
| Rovyn Ltd | Wholesale & retail | 2026 |
| Rowan Motorsport Services Ltd | Professional & scientific | 2026 |
| Rowan Tree Property Ltd | Real estate | 2025 |
| Rowen Service Centre Limited | Wholesale & retail | 2016 |
| Rowsham Advisory Limited | Administrative & support | 2015 |
| Roxley Estates (Northamptonshire) Limited | Construction | 2002 |
| Roxow Ltd | Wholesale & retail | 2022 |
| ROY Property Services Ltd | Administrative & support | 2025 |
| Royale Class Catering Ltd | Hospitality | 2019 |
| Royale Culture Properties Ltd | Real estate | 2020 |
| Royelty Removals Ltd | Transport & logistics | 2024 |
| Royston Recording Systems Limited | Manufacturing | 1965 |
| RP & MP Investments Limited | Manufacturing | 2014 |
| RP BIZ Solutions Ltd | Professional & scientific | 2014 |
| RP Connections Services Ltd | Construction | 2026 |
| RP Executive Consulting Ltd | Professional & scientific | 2024 |
| RP Financial Solutions Ltd | Professional & scientific | 2017 |
| RP Freeholds Ltd | Real estate | 2017 |
| RP Home Properties Limited | Real estate | 2025 |
| RP Winding Services Limited | Professional & scientific | 2013 |
| RPA Automotive Limited | Professional & scientific | 2022 |
| RPA1 Limited | Real estate | 2014 |
| RPA2 Limited | Real estate | 2023 |
| RPA3 Limited | Real estate | 2023 |
| RPB1 Limited | Real estate | 2014 |
| RPB2 Limited | Construction | 2015 |
| RPB3 Limited | Construction | 2017 |
| Rphc Limited | Construction | 2011 |
| RPI 1 Limited | Real estate | 2015 |
| RPI 2 Limited | Real estate | 2015 |
| RPI 3 Limited | Real estate | 2017 |
| RPL Homes Limited | Construction | 2017 |
| Rplanet Ltd | Wholesale & retail | 2019 |
| RPM Consulting Services Ltd | Information & communication | 2021 |
| RPO Medical Ltd | Administrative & support | 2012 |
| Rprk Limited | Real estate | 2025 |
| RPS Engineering Management Ltd | Manufacturing | 1998 |
| RPS Pro International Ltd | Professional & scientific | 2025 |
| RQI Limited | Information & communication | 2015 |
| RR Builders Ltd | Construction | 2026 |
| RR Catering Ltd | Hospitality | 2026 |
| RR Global Metal Supplies Ltd | Wholesale & retail | 2025 |
| RR Maze Limited | Construction | 2004 |
| RR Realisations 2025 | Wholesale & retail | 2003 |