| Race Mates Limited | Professional & scientific | 2008 |
| Rachael Chiverton Limited | Administrative & support | 2014 |
| Rachel Leanne Foster Ltd | Professional & scientific | 2024 |
| Rachel Mooney Limited | Real estate | 2003 |
| Radiant Jewellery Design Limited | Manufacturing | 2014 |
| Radioaktivefilm Ltd | Financial services | 2019 |
| Radman Associates Limited | Professional & scientific | 2016 |
| Rafaella Limited | Information & communication | 2022 |
| RAIL73 Ltd | Professional & scientific | 2023 |
| Railway Exchange Ltd | Hospitality | 2007 |
| Rainbow Bridge Solutions Ltd | Extraterritorial | 2016 |
| Rainmaker Global Limited | Wholesale & retail | 2019 |
| Ralentando Limited | Professional & scientific | 1984 |
| Rambling Nights UK Limited | Arts & recreation | 2020 |
| Ramej Limited | Health & social care | 2014 |
| Randolphe & Knight Limited | Financial services | 2013 |
| Ranote Consultancy Limited | Professional & scientific | 2025 |
| Rapier Star (Imports) Limited | Wholesale & retail | 1992 |
| Rapier Star Holdings Limited | Administrative & support | 2010 |
| Rapier Star Limited | Wholesale & retail | 2011 |
| Rapier Star Protect Limited | Wholesale & retail | 2013 |
| Rapier Star Solutions Limited | Wholesale & retail | 2010 |
| Rating Data Group Limited | Information & communication | 2024 |
| Rating Data Limited | Information & communication | 2024 |
| Rauf Industries Limited | Financial services | 2018 |
| Rauf Villa Investments Limited | Real estate | 2019 |
| Rauf Wellington Healthcare Limited | Health & social care | 2018 |
| Rauf Wellington Investments Limited | Real estate | 2021 |
| Rauf Wellington Limited | Financial services | 2010 |
| Raven Lane Consulting Limited | Professional & scientific | 2016 |
| Raventree Property Limited | Real estate | 2021 |
| Ravnellie Limited | Professional & scientific | 2016 |
| RAW Trade Sales Limited | Wholesale & retail | 2015 |
| Rayners of Stalybridge (Produce Merchants) Limited | Professional & scientific | 1975 |
| RBR Arcadia Chem Limited | Transport & logistics | 2025 |
| RBR Architecural Designs and Trade Links Ltd | Wholesale & retail | 2024 |
| RBR Dynamics Bharath Limited | Manufacturing | 2025 |
| RBR Energy Bharath Limited | Manufacturing | 2025 |
| RBR Group of Companies Limited | Construction | 2024 |
| RBR Healthcare Limited | Manufacturing | 2025 |
| Rbrinfotech Limited | Information & communication | 2025 |
| RCA Property Ventures Ltd | Real estate | 2020 |
| RD Price & Associates Limited | Professional & scientific | 2007 |
| RDE Electrical Services Ltd | Construction | 2019 |
| RDK Consulting Ltd | Information & communication | 2020 |
| RDM Clinical Development Consulting Services Limited | Extraterritorial | 2009 |
| Re:Nu Medical Aesthetics Ltd | Health & social care | 2020 |
| Reach Access Platforms Ltd | Administrative & support | 2023 |
| Reach Trustee Services Ltd | Information & communication | 2011 |
| Reading Climbing Centre Ltd | Professional & scientific | 2011 |
| Ready SET Learn Ltd | Wholesale & retail | 2025 |
| Ready to ACT Training Limited | Manufacturing | 2014 |
| Real Intelligence Technologies Limited | Information & communication | 2026 |
| Realise Strategy & Consulting Limited | Professional & scientific | 2016 |
| Reaxa Limited | Manufacturing | 2003 |
| Rebalance Restore Ltd | Arts & recreation | 2015 |
| Rebecca Mcgowan Ltd | Arts & recreation | 2024 |
| Rebel Base Gaming Ltd | Wholesale & retail | 2026 |
| Reborn Property Ltd | Real estate | 2019 |
| Recellular (UK) Limited | Professional & scientific | 1996 |
| Recellular Investment Company Limited | Extraterritorial | 1997 |
| Record Marketing Limited | Professional & scientific | 2012 |
| Recovery and Wellness Ltd | Arts & recreation | 2025 |
| Rectngl UK Ltd | Wholesale & retail | 2025 |
| Red Boxed Solutions Ltd | Information & communication | 2020 |
| Red Goblin Limited | Professional & scientific | 2016 |
| Red Ice Promotions Limited | Arts & recreation | 2009 |
| Red Kite Accountancy Ltd | Administrative & support | 2021 |
| Red RAG Marketing Ltd | Professional & scientific | 2020 |
| Red Rose EGB Limited | Information & communication | 2016 |
| Red Star Ventures Limited | Financial services | 2025 |
| Red Tiger Marketing Limited | Other services | 2023 |
| Redbridge Safety Consulting Limited | Professional & scientific | 2015 |
| Redesmere Consulting LLP | | 2017 |
| Redesmere Developments LLP | | 2002 |
| Redesmere Digital LLP | | 2020 |
| Redesmere Limited | Professional & scientific | 2003 |
| Redshift Technology Ltd | Professional & scientific | 2011 |
| Redwillow Brewery Ltd | Manufacturing | 2010 |
| Redx Immunology Limited | Professional & scientific | 2014 |
| Redx Oncology Ltd | Professional & scientific | 2011 |
| Redx Pharma Limited | Professional & scientific | 2010 |
| Reedsmore Ltd | Administrative & support | 2013 |
| Reeves Waste Limited | Water & waste | 2020 |
| Reggio Emilia Ltd | Wholesale & retail | 2018 |
| Regtech Holdings Ltd | Financial services | 2018 |
| Rehoboth Commodities Limited | Professional & scientific | 2016 |
| Rehove Food Limited | Hospitality | 2024 |
| Reiki Master Therapy Limited | Health & social care | 2024 |
| Religious Literacy Partnership Limited | Other services | 2021 |
| Reload Fest Ltd | Arts & recreation | 2025 |
| Remerxed Limited | Wholesale & retail | 2024 |
| Remote Control Digital Ltd | Information & communication | 2025 |
| Removal Truck Sales Ltd | Administrative & support | 2025 |
| Ren-Tech Solutions Limited | Construction | 2015 |
| Renewable Energy Solutions Services Ltd | Professional & scientific | 2012 |
| Renewables (SW) Limited | Energy | 2013 |
| Renooovate Build Ltd | Construction | 2021 |
| Renooovate Invest Ltd | Construction | 2021 |
| Renooovate LET Ltd | Real estate | 2021 |