| Recreative Music Limited | Extraterritorial | 2017 |
| Recruit Assist Ltd | Administrative & support | 2025 |
| Recruit INS Ltd | Financial services | 2020 |
| Recruitment Team Nine Holdings Limited | Financial services | 2014 |
| Recruitment Team Nine Limited | Administrative & support | 2008 |
| Rectech Solutions Limited | Administrative & support | 2024 |
| Red House Romsey Ltd | Households | 2015 |
| Redaptive Sustainability Services UK Limited | Administrative & support | 2023 |
| Redcat Digital Limited | Administrative & support | 2018 |
| Redcat Solutions Limited | Administrative & support | 2000 |
| Redford Electrical Ltd | Construction | 2019 |
| Redwood Comms Ltd | Professional & scientific | 2016 |
| Reecap Catering Limited | Hospitality | 2018 |
| Reedon Management Ltd | Professional & scientific | 2019 |
| Reeves Training Solutions Ltd | Education | 2019 |
| Reform Design and Build Ltd | Construction | 2013 |
| Regal Trading (U.K.) Limited | Wholesale & retail | 1991 |
| Regans (Whitton) Limited | Hospitality | 1962 |
| Regency Carpets & Flooring Ltd | Construction | 2026 |
| Reinspired Coaching & Consulting Limited | Professional & scientific | 2021 |
| Reiss Property Management Ltd | Households | 2017 |
| Reliant Nickel Limited | Mining & quarrying | 2021 |
| Renner Compressors (UK) Limited | Administrative & support | 2015 |
| Renner Kompressoren Limited | Administrative & support | 2014 |
| Replas Machinery Limited | Manufacturing | 1981 |
| Replenishment Solutions Limited | Professional & scientific | 2016 |
| Repli Limited | Wholesale & retail | 2025 |
| REQ Design Limited | Wholesale & retail | 2019 |
| RER Solutions Limited | Administrative & support | 2021 |
| Resolution Mass Spec Limited | Manufacturing | 2019 |
| Resolution Print and Design Ltd | Manufacturing | 2004 |
| Resonate Build Ltd | Professional & scientific | 2026 |
| Restoration Consultation Ltd | Construction | 2025 |
| Retail Concession Catering Limited | Professional & scientific | 2008 |
| Retail Concession Management Limited | Extraterritorial | 2001 |
| Retail Concessions Limited | Professional & scientific | 1992 |
| Retail Concessions UK Limited | Extraterritorial | 1995 |
| Retail Therapy (Hertford) Limited | Wholesale & retail | 2003 |
| Reverse Precision Ltd | Manufacturing | 2026 |
| Revinon Ltd | Information & communication | 2025 |
| Revive Enterprise Ltd | Wholesale & retail | 2023 |
| Revive Pilates Studio Limited | Arts & recreation | 2024 |
| RH Splicers Ltd | Construction | 2012 |
| RH Storage Ltd | Administrative & support | 2022 |
| RHB London Solutions Ltd | Professional & scientific | 2025 |
| RHE Design LLP | | 2012 |
| Rhombusea Limited | Professional & scientific | 2021 |
| Rhythm to the Chaos Ltd | Wholesale & retail | 2025 |
| Rialto Homes Limited | Construction | 1992 |
| Rialto Properties Ltd | Financial services | 1980 |
| Ribeye Films Limited | Professional & scientific | 2010 |
| Ricciardi Mechanical Services Limited | Construction | 2022 |
| Richard Adams Associates Limited | Administrative & support | 2010 |
| Richard Charles Sales Limited | Wholesale & retail | 2020 |
| Richard Hale School | Education | 2013 |
| Richard Long Associates Limited | Administrative & support | 2017 |
| Richard Painter Associates Ltd | Professional & scientific | 2010 |
| Richard Smallwood Associates Ltd | Professional & scientific | 2017 |
| Richarmi Ltd | Professional & scientific | 2024 |
| Richman Emdr Training Ltd | Health & social care | 2015 |
| Ricky Flynn Motor Sport Limited | Wholesale & retail | 2012 |
| Ricky Flynns Motorsports Limited | Wholesale & retail | 2012 |
| Ricochet Group Ltd | Information & communication | 2011 |
| Ricochet Investments Limited | Professional & scientific | 2021 |
| Ricson Accountancy Services Ltd | Professional & scientific | 2019 |
| Ridgecrest PLC | Professional & scientific | 1983 |
| Ridgeway Group Services Limited | Construction | 2023 |
| Riesen Pet Co. Ltd. | Wholesale & retail | 2020 |
| Right Price Books Limited | Transport & logistics | 1991 |
| Right to Manage Your Flats Limited | Professional & scientific | 2003 |
| Rigstore Limited | Information & communication | 2016 |
| Ringcrown Limited | Professional & scientific | 2011 |
| RIP Mount Ventures Limited | Professional & scientific | 2003 |
| Rise Hair Spa Limited | Other services | 2024 |
| Risen Artisan Bakery Ltd | Wholesale & retail | 2026 |
| Riverpoint 2009 RTM Company Limited | Households | 2009 |
| Rivers Reach Management Co. Limited | Households | 1997 |
| Riverside Property Ventures Ltd | Real estate | 2024 |
| Riverside Walk (Mill END) Management Company Limited | Households | 1998 |
| Riversmeet (Estate Maintenance) Limited | Households | 1973 |
| Riversmeet Owners Limited | Households | 2006 |
| Riversmeet RTM Limited | Households | 2007 |
| Riverswood Limited | Administrative & support | 2002 |
| Rixanalytics Ltd | Information & communication | 2014 |
| RJ Executive Coaching Ltd | Professional & scientific | 2024 |
| RJC Consulting Services Limited | Professional & scientific | 2025 |
| RJT90 Limited | Administrative & support | 2025 |
| RK and Sons Ltd | Construction | 2019 |
| RKG Management Limited | Households | 2003 |
| RML Property Services Limited | Construction | 2017 |
| RMS Rentals Limited | Real estate | 2020 |
| RNM Consultants Limited | Other services | 2021 |
| Roar Commerce Limited | Administrative & support | 2019 |
| Robert Bennett Associates Limited | Professional & scientific | 2014 |
| Robert Harrison Property Limited | Real estate | 2010 |
| Robert Mills Photography Ltd | Professional & scientific | 2013 |
| Roberts Heating & GAS Services Ltd | Administrative & support | 2017 |
| Robin Mortgages & Financial Consultancy Ltd | Financial services | 2021 |
| Robinsons Landscape Construction Ltd | Administrative & support | 2011 |
| Robyland Building Supplies Limited | Construction | 1993 |