| Rebecca Batchelor Country Properties Ltd | Real estate | 2021 |
| Rebecca Phillips Dental Hygiene & Therapy Services Limited | Health & social care | 2014 |
| Rebecca Turnbull Limited | Professional & scientific | 2016 |
| Rebellion Collective Limited | Professional & scientific | 2022 |
| Rebma Limited | Professional & scientific | 2008 |
| Rebu Services Ltd | Transport & logistics | 2023 |
| Reconsolidated Ltd | Financial services | 2026 |
| Record Lighting Ltd | Professional & scientific | 2018 |
| Recruitline Ltd | Administrative & support | 2026 |
| Recruitmee Limited | Information & communication | 2024 |
| Recruitment Store UK Limited | Professional & scientific | 2005 |
| Recycle My Mattress Ltd | Other services | 2023 |
| Red and Blue Marketing Limited | Professional & scientific | 2023 |
| Red Cottage Finds Ltd | Wholesale & retail | 2025 |
| Red Firefly Ltd | Information & communication | 2014 |
| Red Fish Accountancy Limited | Professional & scientific | 2002 |
| Red FOX Brickwork Ltd | Construction | 2026 |
| Red Lion Business Coaching Ltd | Administrative & support | 2025 |
| Red Mowers Gardening Services Ltd | Administrative & support | 2018 |
| Red River Interiors Limited | Construction | 2013 |
| Red River Property Limited | Real estate | 2020 |
| Red River Software Limited | Information & communication | 2008 |
| Red Rock Interior Construction Ltd | Construction | 2015 |
| Red Snapper Solutions Ltd | Information & communication | 2022 |
| Redalfa Limited | Information & communication | 2026 |
| Redarrow Asset Management Limited | Other services | 2003 |
| Redem Limited | Information & communication | 2012 |
| Redhill Wingchun Ltd | Health & social care | 2026 |
| REDKILND2DEV Ltd | Other services | 2025 |
| Redman Lets Limited | Real estate | 2018 |
| Redstride Consulting Limited | Professional & scientific | 2025 |
| Redwick Commerce Solutions Ltd | Wholesale & retail | 2026 |
| Redwing Business Growth Ltd | Professional & scientific | 2010 |
| Redwood Hill Limited | Construction | 2017 |
| Refine Metals (Autocore) Limited | Water & waste | 2016 |
| Refined Metal Recycling Limited | Water & waste | 2021 |
| Refined Renovations & Maintenance Ltd | Manufacturing | 2025 |
| Reform Pilates West Sussex Ltd | Arts & recreation | 2021 |
| REFURB100 Ltd | Real estate | 2023 |
| Refyness Ltd | Professional & scientific | 2023 |
| Regen AI Ltd | Information & communication | 2024 |
| Regency Ironworks Limited | Construction | 2002 |
| Regtcom Engineering Company Ltd | Water & waste | 2025 |
| Regulation 90 Music Ltd | Professional & scientific | 2018 |
| REH Seismic Acquisition Consultancy Ltd | Professional & scientific | 2018 |
| Rehoboth Well Homes Ltd | Real estate | 2025 |
| Reicon Limited | Other services | 2017 |
| Reimar Homes Ltd | Construction | 2024 |
| Rekit Horsham CIC | Wholesale & retail | 2025 |
| Reliance Care Limited | Health & social care | 2017 |
| Reliance Wealth Management Limited | Professional & scientific | 2011 |
| Relish Group Limited | Information & communication | 2018 |
| Relleen Enterprises Ltd | Wholesale & retail | 2023 |
| Relleen Industries Ltd | Wholesale & retail | 2024 |
| Relocate Down Under Limited | Professional & scientific | 2018 |
| Relogue Limited | Information & communication | 2025 |
| Remedy Consulting Limited | Construction | 2021 |
| Remo Composites Ltd | Manufacturing | 2017 |
| Remotech Limited | Transport & logistics | 2002 |
| Renia Limited | Professional & scientific | 2010 |
| Renofurb Property Ltd | Construction | 2025 |
| Renovare Systems Ltd | Administrative & support | 2019 |
| Rentech Europe Ltd | Administrative & support | 2024 |
| Rentt for Good CIC | Information & communication | 2025 |
| Rentt Limited | Information & communication | 2020 |
| Repsol Consultants Ltd | Professional & scientific | 2016 |
| Republic Aviation Limited | Administrative & support | 2016 |
| Resanco Limited | Manufacturing | 1993 |
| Reserved Training Limited | Education | 2021 |
| Reside Property Ltd | Real estate | 2021 |
| Residential & Commercial Ltd | Professional & scientific | 1998 |
| Residential Reit Limited | Administrative & support | 2011 |
| Residents of Vicarage Close Ltd. | Households | 2006 |
| Resite Lettings Ltd | Real estate | 2025 |
| Resite Limited | Construction | 2018 |
| Resolute Global Mobility Limited | Professional & scientific | 2026 |
| Resolve Partitioning Limited | Construction | 2014 |
| Rest Recruitment Ltd | Administrative & support | 2025 |
| Restart Psychology Ltd | Health & social care | 2026 |
| Restoration to Agriculture Limited | Water & waste | 2014 |
| Retail Fire Limited | Public administration | 2017 |
| Retail Property Analyst Limited | Extraterritorial | 2009 |
| Rethought Investment Limited | Financial services | 2018 |
| Rethought Solutions Ltd | Information & communication | 2025 |
| Reuben Diamonds Limited | Manufacturing | 2022 |
| Revivify Upholstery Ltd | Manufacturing | 2023 |
| Revolate Ltd | Professional & scientific | 2026 |
| Revs of Horsham Ltd | Wholesale & retail | 2015 |
| Rewilding US Ltd | Professional & scientific | 2025 |
| Reword Solutions Ltd | Professional & scientific | 2023 |
| Reynard Creative Ltd | Professional & scientific | 2024 |
| Reynem Ltd | Hospitality | 2025 |
| RFC Power Limited | Professional & scientific | 2017 |
| RG Hards Electrical Ltd | Construction | 2022 |
| RGV Commercial & Domestic Heating Ltd | Construction | 2023 |
| RH13 Ltd | Professional & scientific | 2019 |
| Rhaglan Investments Ltd | Financial services | 2022 |
| Rhombic Reservoir Ltd | Professional & scientific | 2017 |
| RIA Mishaal Ltd | Wholesale & retail | 2014 |
| RIA Pension Trustees Limited | Financial services | 2018 |