| Rapid Secuirty Services Ltd | Administrative & support | 2026 |
| RAW Drainage Ltd | Professional & scientific | 2023 |
| Ray-Al Coaches Limited | Transport & logistics | 2010 |
| Rayments Vehicle Servicing and Repairs Limited | Wholesale & retail | 2015 |
| RBC (Newport) Management Company Limited | Households | 2019 |
| RBT Fitness Ltd | Arts & recreation | 2026 |
| RCC Design & Build Ltd | Construction | 2019 |
| Rclimate Limited | Manufacturing | 2014 |
| RCU Services Limited | Real estate | 2025 |
| RD Electrical ELY Limited | Construction | 2013 |
| RD Power Generation Limited | Professional & scientific | 2020 |
| Rd&D Ltd | Professional & scientific | 2012 |
| Rdscommerce.Com Ltd | Wholesale & retail | 2026 |
| Re-Imagine Resource Centre Community Interest Company | Administrative & support | 2013 |
| Read Estates and Developments Ltd | Real estate | 2017 |
| Really Sweet Ltd | Manufacturing | 2013 |
| Realworld Technology Limited | Information & communication | 2016 |
| Rebloom Group Ltd | Construction | 2025 |
| Reckless STY Ltd | Manufacturing | 2026 |
| Rectory Accounting and Business Services Ltd | Professional & scientific | 2023 |
| Red Balloon Group Ltd | Real estate | 2017 |
| Red Cedar Properties Ltd | Real estate | 2018 |
| Red Chilli ELY Limited | Hospitality | 2024 |
| Red Coat Development Limited | Information & communication | 2021 |
| Red Flower Consulting Limited | Professional & scientific | 2015 |
| Red Lion (Stretham) Ltd | Hospitality | 2016 |
| Red Panda Maintenance Limited | Professional & scientific | 2025 |
| Red Rock Grill Limited | Hospitality | 2013 |
| Red Squirrel Crew Limited | Construction | 2020 |
| Redact Solutions Ltd | Information & communication | 2008 |
| Redbricks 786 Ltd | Real estate | 2026 |
| Redvers Business Services Limited | Professional & scientific | 2026 |
| Reeve Property Limited | Extraterritorial | 2013 |
| Reeves Faux Signature Group Limited | Information & communication | 2026 |
| Refloor Ltd | Construction | 2020 |
| Regal Joinery Ltd | Manufacturing | 2016 |
| Regent Hotel (Cambridge) Limited | Real estate | 2014 |
| Rejuve Aesthetic Clinic Ltd | Health & social care | 2026 |
| Relibro Ltd | Wholesale & retail | 2025 |
| Rent to LET Limited | Real estate | 2023 |
| Reselling to Riches Limited | Administrative & support | 2020 |
| Resolve Roofing Ltd | Construction | 2022 |
| Respiratory Effectiveness Limited | Health & social care | 2013 |
| Restart-Ed Ltd | Professional & scientific | 2010 |
| Restore Clinic Ltd | Health & social care | 2023 |
| Reveal Landscaping Limited | Administrative & support | 2025 |
| Revelusual Limited | Manufacturing | 1993 |
| Revisit Limited | Wholesale & retail | 2024 |
| RFK Foods Limited | Hospitality | 2024 |
| RGC Electrical Installations Limited | Construction | 2023 |
| RGP Security Services Limited | Administrative & support | 2009 |
| RH Pharma Consulting Ltd | Professional & scientific | 2020 |
| RH Traffic Management Design Limited | Construction | 2022 |
| Richard Designs Limited | Manufacturing | 2007 |
| Richard ORD Consulting Limited | Professional & scientific | 2009 |
| Ricula (Video) Limited | Information & communication | 1999 |
| Ridge (Peterborough) Management Company Limited | Households | 2002 |
| Ridgepole Ltd | Hospitality | 2026 |
| Ridvan Transport Ltd | Transport & logistics | 2018 |
| Rima's Shop Ltd | Wholesale & retail | 2012 |
| Rims Events & Party Rentals Limited | Administrative & support | 2024 |
| Ringuk Ltd | Extraterritorial | 2012 |
| Rise UP Coffee Ltd | Hospitality | 2025 |
| Rivega Limited | Health & social care | 2024 |
| Riverfen Farms Ltd | Agriculture & fishing | 1966 |
| Riverside Inn ELY Ltd | Hospitality | 2026 |
| Riverside Island Marina Limited | Hospitality | 2014 |
| Rixon Accountancy Ltd | Professional & scientific | 2014 |
| RJH Contractors Ltd | Construction | 2024 |
| Rjjcc Homes Ltd | Real estate | 2025 |
| RKH Solutions Limited | Information & communication | 2017 |
| RM Residential Properties Ltd | Households | 2022 |
| RM XL Consult Limited | Professional & scientific | 2024 |
| RME Investments Ltd | Real estate | 2019 |
| RN Optical Limited | Health & social care | 2023 |
| RNH Optical Limited | Wholesale & retail | 2025 |
| Roadpager Limited | Information & communication | 2014 |
| Roadstone Construction Limited | Construction | 2016 |
| Roast & FRY House Ltd | Hospitality | 2025 |
| Robbins and Sons Construction Limited | Construction | 2018 |
| Roberts Drainage Ltd | Water & waste | 2023 |
| Robinson Developments (Newmarket) LLP | | 2023 |
| Roboscientific Limited | Professional & scientific | 2011 |
| Robydome Properties Limited | Manufacturing | 1976 |
| Rocket AG Ltd | Financial services | 2021 |
| Rollings Accounts Limited | Professional & scientific | 2016 |
| Rollz Mobility UK Ltd | Manufacturing | 2019 |
| Romexxco Ltd | Health & social care | 2022 |
| Root Network Consulting Ltd | Information & communication | 2015 |
| Rose Solutions Inc Limited | Administrative & support | 2008 |
| Rosewood Estate Chippenham Limited | Real estate | 2026 |
| Roshanishara Ltd | Administrative & support | 2026 |
| Ross Taylor Holdings Limited | Financial services | 2022 |
| Rosslyn David Recruitment Limited | Administrative & support | 2018 |
| Rossmere Developments Limited | Administrative & support | 1998 |
| Rostorex Ltd | Wholesale & retail | 2026 |
| Roswell Marine Limited | Extraterritorial | 2007 |
| ROW 2 Grow Limited | Construction | 2024 |
| Rowntree Parade Management Company Limited | Households | 1984 |
| Royzena Court Limited | Real estate | 2020 |