| Ramech Ltd | Arts & recreation | 2010 |
| Ramos Architecture & Design Ltd | Professional & scientific | 2015 |
| Randall Commercial Services Ltd | Wholesale & retail | 2010 |
| Random Dream Limited | Wholesale & retail | 2022 |
| Ranger Home Care Group Limited | Health & social care | 2024 |
| Ranger Home Care Ltd | Health & social care | 2015 |
| Rapfel Legal Ltd | Professional & scientific | 2024 |
| Rare Sight Associates Ltd | Professional & scientific | 2020 |
| Rathee Driving Ltd | Education | 2026 |
| Rathstones Financial Limited | Financial services | 2015 |
| Ravello LAB Limited | Wholesale & retail | 2018 |
| Ravenswood Drive (Camberley) Management Limited | Households | 2025 |
| Ravenswood Management (Camberley) Limited | Real estate | 2001 |
| RAW Architects Ltd | Professional & scientific | 2020 |
| Rawr Products Ltd | Wholesale & retail | 2020 |
| Rayhan Aziz Ltd | Wholesale & retail | 2025 |
| Rayz Ltd | Health & social care | 2015 |
| RB (M&E) QS Limited | Professional & scientific | 2011 |
| RB Group South Ltd | Construction | 2018 |
| RB Mechanical Services South Ltd | Construction | 2018 |
| RBU Logistics Ltd | Transport & logistics | 2026 |
| RCP Autotech Ltd | Wholesale & retail | 2021 |
| RCR Electrical Systems Limited | Construction | 2011 |
| Rdcs Services Ltd | Construction | 2026 |
| RDK (Garden Services) Limited | Administrative & support | 2012 |
| RE DUE Sicilie Limited | Wholesale & retail | 2016 |
| Re-Landscapes & Groundworks Ltd | Construction | 2012 |
| Re.Sauce Limited | Professional & scientific | 1999 |
| React (Site Solutions) Limited | Administrative & support | 2012 |
| Reading Gateway (Reading) Management Company Limited | Households | 2017 |
| Real Deal Sourcing Ltd | Administrative & support | 2024 |
| Real Property Investment Solutions Limited | Real estate | 2024 |
| Realty Access Limited | Professional & scientific | 2010 |
| Realty Access Title Limited | Professional & scientific | 2010 |
| Realty Capital Investment Properties Ltd | Real estate | 2025 |
| Rebecca Liane Aesthetics Ltd | Other services | 2022 |
| Rebirth Sports Ltd | Arts & recreation | 2022 |
| Rebloom Ltd | Extraterritorial | 2013 |
| Rebooting IT Ltd | Information & communication | 2025 |
| Red 10 Group Ltd | Professional & scientific | 2015 |
| Red Bear Property Management Limited | Real estate | 2019 |
| Red Elleven Ltd | Information & communication | 2023 |
| Red Jasper Solutions Limited | Professional & scientific | 2023 |
| RED16 Limited | Information & communication | 2026 |
| Redcoat Woodwork Limited | Manufacturing | 2024 |
| Redcormorant Research Ltd | Professional & scientific | 2025 |
| Reddu Ltd | Health & social care | 2025 |
| Redesign Developments Limited | Construction | 2025 |
| Redoubtable Consulting Limited | Professional & scientific | 2025 |
| Redwater Technology Ltd | Information & communication | 2025 |
| Redweb Investments Limited | Real estate | 2014 |
| Redwing Partnership Limited | Professional & scientific | 2011 |
| Redwood Corporate Finance Limited | Financial services | 2010 |
| Redwood Equestrian Ltd | Agriculture & fishing | 2017 |
| Redwood Property Finance Limited | Financial services | 2010 |
| Reeder Properties Limited | Construction | 2026 |
| Reel Nomads Ltd | Agriculture & fishing | 2023 |
| Reel Stunts Limited | Arts & recreation | 2021 |
| Reel Time Films Limited | Information & communication | 2005 |
| Reem Badda London Limited | Wholesale & retail | 2003 |
| Reem Fine Art Limited | Arts & recreation | 2014 |
| Reem Gallery Limited | Wholesale & retail | 2019 |
| Reet Private Ltd | Professional & scientific | 2012 |
| Reevr Talent Ltd | Administrative & support | 2024 |
| Refero Software Ltd | Information & communication | 2017 |
| Refined Contracts Limited | Professional & scientific | 2020 |
| Reflection in Blue Limited | Extraterritorial | 1998 |
| Reflectis Limited | Professional & scientific | 2016 |
| Reforma Studios Ltd | Arts & recreation | 2024 |
| Refoveo Ltd | Information & communication | 2026 |
| Refractive Limited | Professional & scientific | 2006 |
| Regal Education Limited | Education | 2015 |
| REGALIA21ST Ltd | Professional & scientific | 2025 |
| Regalian Cleaning & Sealants Limited | Administrative & support | 2004 |
| Regar Limited | Public administration | 2020 |
| Regency Financial Consultancy LLP | | 2005 |
| Regency Gardens (Benson) Management Company Limited | Households | 2025 |
| Regents Court Estate Limited | Real estate | 1995 |
| Regents Estate Agents (Surrey) Limited | Real estate | 2014 |
| Regno Cloud Limited | Information & communication | 2020 |
| Regulatory Specialist Consulting Limited | Professional & scientific | 2012 |
| Reliance Maritime Ltd | Administrative & support | 2008 |
| Relocate UK Limited | Real estate | 1995 |
| Remus Technologies Limited | Information & communication | 1994 |
| Rendezvous Housing Limited | Real estate | 2024 |
| Rendezvous Housing Solutions CIC | Real estate | 2024 |
| Renew Surface Repairs Ltd | Construction | 2020 |
| Rent Koto Limited | Real estate | 2023 |
| Rental Robin Ltd | Real estate | 2020 |
| Reorganise Your Space Ltd | Administrative & support | 2025 |
| REP One More Limited | Other services | 2025 |
| Repair & Recycle Tech Ltd | Water & waste | 2025 |
| Repair POD Limited | Extraterritorial | 2016 |
| Replen Limited | Arts & recreation | 2016 |
| Reservoir Alpacas Ltd | Agriculture & fishing | 2025 |
| Residential Holdings Limited | Extraterritorial | 2005 |
| Residential Property Group Limited | Real estate | 2005 |
| Resilient Housing Ltd | Administrative & support | 2005 |
| Resolute Athletic Ltd | Arts & recreation | 2022 |
| Resource Solutions VIA Projects Limited | Professional & scientific | 2014 |