| RJ Maintenance Group Ltd | Construction | 2026 |
| RJ Wilson Fire & Security Limited | Administrative & support | 2019 |
| RK Agricultural Ltd | Transport & logistics | 2014 |
| RK Professional Services Ltd | Professional & scientific | 2025 |
| RK Rust Limited | Professional & scientific | 2019 |
| RLK Pro Developments Ltd | Agriculture & fishing | 2013 |
| RLR Demolition Ltd | Construction | 2018 |
| RM Engineering (Lincs) Limited | Construction | 2022 |
| RM Mechanical Spalding Ltd | Wholesale & retail | 2024 |
| RM Securetech Ltd | Administrative & support | 2019 |
| RM Transport Solutions Ltd | Transport & logistics | 2022 |
| RMG Trans Ltd | Transport & logistics | 2014 |
| RMT Engineering Limited | Professional & scientific | 2019 |
| Road Sailor Ltd | Transport & logistics | 2016 |
| Roads on Ltd | Transport & logistics | 2019 |
| ROB Bracey Holdings Ltd | Real estate | 2024 |
| ROB Bracey Ltd | Water & waste | 2013 |
| ROB Woodcock Engineering Ltd | Administrative & support | 2010 |
| Robbo's Driver Services Ltd | Transport & logistics | 2013 |
| Robert Matanowski Limited | Transport & logistics | 2013 |
| Robert Ortov Ltd | Other services | 2012 |
| Roberta Richardson Consulting Ltd | Professional & scientific | 2014 |
| Roberte Company Ltd | Transport & logistics | 2024 |
| Robin Ball Associates Limited | Information & communication | 1998 |
| Robs Mobile Clinic Limited | Health & social care | 2024 |
| Robval Trans Ltd | Transport & logistics | 2016 |
| Rocco Hair Designer Limited | Other services | 2025 |
| Rock 84 Limited | Manufacturing | 2025 |
| Rock Native Ltd | Construction | 2026 |
| Rock NET (Group) Ltd | Mining & quarrying | 2008 |
| Rock NET Marine Ltd. | Construction | 2008 |
| Rock NET Plant Ltd | Construction | 2011 |
| Rock NET Transport Ltd | Mining & quarrying | 2015 |
| Rock NET Works Ltd | Mining & quarrying | 2011 |
| Rock Solid Solutions Ltd | Construction | 2025 |
| Rocket MAX Ltd | Transport & logistics | 2019 |
| Rocketsoft Ltd | Information & communication | 2020 |
| Rodders Drainage Services Limited | Water & waste | 2019 |
| Roffes Transport Limited | Transport & logistics | 1977 |
| Rogala Service Ltd | Transport & logistics | 2015 |
| Rolincs Ltd | Wholesale & retail | 2018 |
| Rolltech Industries Ltd | Construction | 2025 |
| ROM Cost Trans Ltd | Transport & logistics | 2016 |
| Roof Cure Ltd | Construction | 2025 |
| Roof FIX Building Ltd | Construction | 2019 |
| Roof Pro Group Ltd | Construction | 2026 |
| Roof Restorations (Midlands) Ltd | Construction | 2025 |
| Roof Works (South) Ltd | Construction | 2023 |
| Roof-Craft (Midlands) Ltd | Construction | 2024 |
| Roof-Fens Ltd | Construction | 2025 |
| Roofcare (Maintenance) Ltd | Construction | 2020 |
| Roofer Defender Ltd | Construction | 2024 |
| Roofguard (East) Ltd | Construction | 2025 |
| Roofline (Suffolk) Ltd | Construction | 2022 |
| Roofs Covered . COM Ltd | Construction | 2024 |
| Rooke's Pet Products Limited | Wholesale & retail | 1979 |
| Rooneys Properties Limited | Real estate | 2026 |
| Rooo-Star Limited | Wholesale & retail | 2023 |
| Rooted Assets Ltd | Financial services | 2024 |
| Roro Holdings Limited | Financial services | 2022 |
| Roroland Limited | Transport & logistics | 2014 |
| Rose & Crown (Holbeach) Limited | Hospitality | 2015 |
| Rosebery North Management Company Limited | Households | 2016 |
| Rosebrook Care Ltd | Health & social care | 2017 |
| Rosedale Stables Ltd | Construction | 2026 |
| Rosegate Plumbing and Heating Limited | Construction | 2012 |
| Rosemint Co Limited | Administrative & support | 2025 |
| Roses Construction Ltd | Construction | 2026 |
| Rosewood ARM Ltd | Real estate | 2022 |
| Rototo Ltd | Construction | 2024 |
| Rottweiler Home Ltd | Manufacturing | 2023 |
| Rough Terrain Event Medics Limited | Health & social care | 2022 |
| Roxamo Engineering Ltd | Professional & scientific | 2025 |
| Roxana Services Limited | Professional & scientific | 2022 |
| ROY and Sons Roofing Ltd | Construction | 2025 |
| Royale Enamel Limited | Manufacturing | 2014 |
| Royale Landscaping Gardens Ltd | Administrative & support | 2025 |
| Roythornes Holdings Limited | Administrative & support | 2008 |
| Roythornes LLP | | 2024 |
| Roythornes Trustees Limited | Administrative & support | 2014 |
| RP22 Limited | Transport & logistics | 2014 |
| RPC Partners Ltd | Financial services | 2020 |
| RPM Services (Lincs) Ltd | Construction | 2017 |
| Rpms Air Conditioning Ltd | Construction | 2021 |
| RPN Consultancy Ltd | Professional & scientific | 2026 |
| RPS Construction Limited | Construction | 2003 |
| RR Maintenance Services Ltd | Construction | 2022 |
| RS & MSH Consultancy Services Limited | Professional & scientific | 2018 |
| Rubix Biotech Ltd | Manufacturing | 2025 |
| Ruckland Ltd | Agriculture & fishing | 2017 |
| Rudge Automotive Limited | Manufacturing | 2023 |
| Rudge Cycles Limited | Manufacturing | 2025 |
| Ruiu Trans Ltd | Transport & logistics | 2018 |
| Rumbles Donington Ltd | Hospitality | 2023 |
| Rupki Ltd | Wholesale & retail | 2023 |
| Rush Hour Escape Rooms Ltd | Arts & recreation | 2019 |
| Rust and Dust Limited | Wholesale & retail | 2023 |
| Rustbuster Limited | Wholesale & retail | 1998 |
| Rusty Flakes Ltd | Wholesale & retail | 2025 |
| Rutland Security Contracting Ltd | Administrative & support | 2023 |