| Recital Corporation Limited | Information & communication | 1988 |
| Recover From Trauma Ltd | Health & social care | 2025 |
| Recovery Services Nationwide Ltd | Transport & logistics | 2024 |
| Rectory Cafe Ltd | Hospitality | 2025 |
| Rectory Lane Nursery Limited | Education | 2012 |
| Recycool Tech Limited | Water & waste | 2025 |
| Red Cars International Ltd | Wholesale & retail | 2013 |
| Red Fish Roofing Ltd | Construction | 2025 |
| Red Kite Code Ltd | Information & communication | 2022 |
| Red Robin Lights Ltd | Other services | 2023 |
| Red Solutions Limited | Administrative & support | 2003 |
| Red UK Purchaser Limited | Financial services | 2023 |
| Red-Fleshed Dragon Fruit Ltd | Wholesale & retail | 2025 |
| Redfern Grab & Tipper Limited | Water & waste | 2014 |
| Redrock Invest Limited | Professional & scientific | 2021 |
| Redwing Recruitment Limited | Other services | 2021 |
| Redwood Technologies Group Ltd | Information & communication | 2014 |
| Redwood Technologies Limited | Information & communication | 1993 |
| Rees-Hough Limited | Professional & scientific | 1968 |
| Reesau Ltd | Information & communication | 2010 |
| Reeves Butchers Group Limited | Financial services | 2023 |
| Reeves Butchers Holdings Ltd | Financial services | 2016 |
| Reeves Butchers Ltd. | Wholesale & retail | 1996 |
| Reflective Together Limited | Education | 2024 |
| Refurbishment Specialists Ltd | Construction | 2021 |
| Regal Mineral Solutions Limited | Professional & scientific | 2007 |
| Regal Plumbing Ltd | Construction | 2023 |
| Regale Design Studio Ltd | Administrative & support | 2013 |
| Regalworld Limited | Agriculture & fishing | 2000 |
| Reggies Retreat Limited | Other services | 2010 |
| Rehoboth-Rk Ltd | Real estate | 2025 |
| Reign Packaging Ltd | Wholesale & retail | 2024 |
| Reiner Consulting Ltd | Information & communication | 2019 |
| Rekindle Marketing Consultancy Limited | Professional & scientific | 2017 |
| Release Radio Broadcasting Limited | Information & communication | 2019 |
| Relexco Ltd | Transport & logistics | 2024 |
| Reliance Consults Services Ltd | Administrative & support | 2023 |
| Reliance High-Tech Limited | Administrative & support | 1986 |
| Rema Lettings Ltd | Real estate | 2022 |
| Renewd UK Distribution Ltd | Wholesale & retail | 2022 |
| Renoir Bidco Limited | Professional & scientific | 2011 |
| RENOV8 & Refurb Ltd | Construction | 2026 |
| Rent-Wise Properties Ltd | Real estate | 2024 |
| Republic of James Limited | Other services | 2025 |
| RES Insights Ltd | Mining & quarrying | 2024 |
| Resaytec Limited | Wholesale & retail | 2015 |
| Resolution Roofing & Building Ltd | Construction | 2025 |
| Resonant Computing Ltd | Information & communication | 2018 |
| Response AID Solutions Limited | Other services | 2016 |
| Responsiv Solutions Ltd. | Information & communication | 2015 |
| Restyle Systems Investment Co Ltd | Financial services | 2021 |
| Restyle Systems Ltd | Information & communication | 2015 |
| Rethymos Limited | Professional & scientific | 2021 |
| Retrieve a PAW Ltd | Other services | 2026 |
| Revankar Associates Ltd | Professional & scientific | 2012 |
| Revbooster Limited | Professional & scientific | 2025 |
| Revity Housing Ltd | Real estate | 2024 |
| Rewarding Lifestyle Creations Ltd | Education | 2020 |
| REY Consulting Solutions Ltd | Professional & scientific | 2026 |
| Reyansh & Rudransh Ltd | Real estate | 2022 |
| RF COM Solutions Limited | Information & communication | 2015 |
| RG12 Labs Ltd | Information & communication | 2024 |
| RG4 Group Ltd | Real estate | 2025 |
| RH House Ltd | Extraterritorial | 2017 |
| RHK Medical Services Ltd | Health & social care | 2023 |
| Rhouz Limited | Real estate | 2018 |
| Richard Dalmas Ltd | Administrative & support | 2009 |
| Right Recruit Limited | Administrative & support | 2016 |
| Right Route Constructions Ltd | Construction | 2026 |
| Rijal Limited | Real estate | 2023 |
| Rimu Marketing Limited | Extraterritorial | 2019 |
| Ringtrue Ltd | Water & waste | 2020 |
| RJC Austen Books Ltd | Information & communication | 2015 |
| Rjms Services Limited | Information & communication | 2016 |
| RJO Rigging Ltd | Information & communication | 2025 |
| RK CAD Services Ltd | Professional & scientific | 2016 |
| RK Procurement Specialists Ltd | Professional & scientific | 2011 |
| RKB Project Services Limited | Administrative & support | 2007 |
| RL Services Ductwork Limited | Construction | 2017 |
| RL Works Ltd | Manufacturing | 2025 |
| Rlpresents Ltd | Other services | 2017 |
| RM Properties Investment Limited | Real estate | 2025 |
| RM Recruitment Ltd | Administrative & support | 2020 |
| RMA Driver Solutions Limited | Transport & logistics | 2016 |
| RMG Finance Limited | Financial services | 2016 |
| Rmojo Ltd | Wholesale & retail | 2026 |
| RNC Central Ltd | Construction | 2023 |
| RNJ Street & Garden Furniture Ltd | Manufacturing | 2023 |
| Road Train Removals Ltd | Transport & logistics | 2022 |
| Roadready Software Ltd | Information & communication | 2026 |
| Robel Limited | Hospitality | 2013 |
| Robert Bentley Design Limited | Information & communication | 2006 |
| Robson and Robson Properties Limited | Real estate | 2017 |
| Rocket Comms Ltd | Construction | 2023 |
| Rocket Property Management Limited | Real estate | 2022 |
| Rockford Consultants Limited | Administrative & support | 2004 |
| Rockstone Consultancy Ltd | Education | 2021 |
| Rode Site Services Limited | Construction | 2003 |
| Rogue Wave Software U.K. Limited | Information & communication | 1993 |
| Roman Empire Scaffolding Ltd | Construction | 2023 |