| Raptor Awards Community Interest Company | Education | 2016 |
| Rarcher Software Ltd | Information & communication | 2013 |
| Raus Limited | Wholesale & retail | 2025 |
| Ravence Ltd | Manufacturing | 2026 |
| Rawstone Vehicle Hire Limited | Administrative & support | 2018 |
| RAY Piggott & Sons Limited | Construction | 2012 |
| Rayaro Ltd | Hospitality | 2023 |
| Rayfield Carpentry & Joinery Ltd | Manufacturing | 2018 |
| RB Performance Limited | Information & communication | 2006 |
| RBG Developments Limited | Real estate | 2014 |
| Rbmr Limited | Other services | 2014 |
| RCB Contractors Limited | Construction | 2020 |
| RCH Mechanical Plumbing Serv Ltd | Construction | 2021 |
| RCJ Interiors Ltd | Construction | 2021 |
| RCL Build Limited | Construction | 2025 |
| RCS Sevenoaks Ltd | Construction | 2024 |
| Rdhh Limited | Professional & scientific | 2014 |
| RDP Construction Ltd | Construction | 2015 |
| Re.Lliance Ltd | Other services | 2025 |
| Reachacross (UK) | Other services | 2012 |
| Readystart Associates Limited | Construction | 1996 |
| Real Developments Ltd | Construction | 2022 |
| Realtum Consulting Limited | Professional & scientific | 2007 |
| Rebate My Tax Ltd | Professional & scientific | 2014 |
| Rebecula Consulting Limited | Professional & scientific | 2008 |
| Rebel London Ltd | Information & communication | 2019 |
| Rebel Software Ltd | Manufacturing | 2016 |
| Recruitment Connections Global Ltd | Professional & scientific | 2007 |
| Recruitment Genius Limited | Administrative & support | 2009 |
| Recycling Aggregates Waste Environmental Ltd | Construction | 2024 |
| Recycling Aggregates Waste Ltd | Administrative & support | 2024 |
| Red and Blue Holdings Ltd | Real estate | 2016 |
| Red Brick Coopers Limited | Households | 2013 |
| Red DOT Architectural Design Ltd | Professional & scientific | 2006 |
| Red Gondola Limited | Professional & scientific | 2011 |
| Red House Cottage Limited | Real estate | 2023 |
| Red Kyte Holdings Limited | Financial services | 2021 |
| Red Lion Business Centre Management Company Limited | Real estate | 2008 |
| Red Lion Square Management Company Limited | Households | 2016 |
| RED75 Consulting Ltd | Information & communication | 2011 |
| Redheat Consulting Limited | Information & communication | 2016 |
| Redline Capital Partners (UK) Limited | Financial services | 2020 |
| Redline Strategic Thinking Limited | Administrative & support | 2014 |
| Redmayne Grice Limited | Information & communication | 2020 |
| Reel FUN Ltd | Transport & logistics | 2025 |
| Reeve Plumbing Services Ltd | Construction | 2023 |
| Refine Lifestyles Limited | Health & social care | 2026 |
| Refrigerated Van Conversions Limited | Manufacturing | 2010 |
| Regal Group Holdings Ltd | Financial services | 2024 |
| Regalpoint Holdings Ltd | Construction | 2019 |
| Regalpoint Homes (Borough Green) Limited | Construction | 2019 |
| Regalpoint Homes (Offham) Limited | Construction | 2017 |
| Regalpoint Homes (Shipbourne) Limited | Construction | 2024 |
| Regalpoint Homes (Tonbridge) Limited | Construction | 2016 |
| Regalpoint Homes (Tunbridge Wells) Limited | Real estate | 2016 |
| Regalpoint Homes (Wittersham) Limited | Construction | 2015 |
| Regalpoint Homes Limited | Real estate | 2009 |
| Regan (1977) Limited | Professional & scientific | 2023 |
| Regency Hall Property Management Limited | Real estate | 1993 |
| Regent Homes London Limited | Real estate | 2007 |
| Regent Residential Ltd | Construction | 2018 |
| Regiis Bespoke Ltd | Construction | 2025 |
| Reid-Hamilton Installations Ltd | Construction | 2026 |
| Rejuva London Limited | Health & social care | 2018 |
| Release Digital Limited | Administrative & support | 2016 |
| Relex Holdings Limited | Transport & logistics | 2026 |
| Reliable Plumber Limited | Construction | 2005 |
| Reliv Healthcare Limited | Professional & scientific | 2011 |
| Relyonne UK Limited | Wholesale & retail | 2025 |
| Remap 2010 | Health & social care | 2010 |
| Remediiate (UK) Limited | Manufacturing | 2017 |
| Remitrom Holdings Ltd | Real estate | 2015 |
| REN7OAKS Limited | Wholesale & retail | 2010 |
| Renate Van Beynum Concepts & Design Ltd | Professional & scientific | 2025 |
| Rencraft Group Limited | Financial services | 2024 |
| Rencraft Limited | Manufacturing | 2000 |
| Renewable Power Solutions Ltd | Real estate | 2010 |
| Renholdings Chaucer Limited | Wholesale & retail | 1980 |
| Renno Pro UK Limited | Information & communication | 2026 |
| Renova Kitchens Ltd | Manufacturing | 2026 |
| Renovare Estates Ltd. | Real estate | 2025 |
| Rent Partners Ltd | Real estate | 2023 |
| Renée Materials Ltd | Other services | 2022 |
| Reposs Limited | Information & communication | 2006 |
| Resect Limited | Professional & scientific | 2010 |
| Resilia Connect Ltd | Information & communication | 2024 |
| Resiliency Collective Ltd | Information & communication | 2016 |
| Resin Bound Specialists Ltd | Construction | 2015 |
| Restore London Construction Ltd | Construction | 2026 |
| Restore London Developments Ltd | Real estate | 2019 |
| Resurgam Capital Management Limited | Professional & scientific | 2008 |
| Retro Zo's Sweets Ltd | Wholesale & retail | 2024 |
| REV & Regs Limited | Administrative & support | 2020 |
| Revise Sing Ltd | Education | 2021 |
| Reviseacross Limited | Extraterritorial | 1992 |
| Revival Financial Planning Ltd | Financial services | 2023 |
| Revival Interiors Ltd | Construction | 2009 |
| Revival Line Limited | Agriculture & fishing | 1986 |
| Rextab Group Ltd | Wholesale & retail | 2020 |
| Rextab Investments Ltd | Real estate | 2023 |