| Realm Music Group Ltd | Arts & recreation | 2025 |
| REAPER4X4 Ltd | Wholesale & retail | 2019 |
| Rebdar Limited | Transport & logistics | 2018 |
| Rebecca & Sebi Ltd | Transport & logistics | 2025 |
| Rebel Consultancy Services Ltd | Professional & scientific | 2024 |
| Reborn Healthcare Limited | Wholesale & retail | 2012 |
| Rebuild Construction Limited | Construction | 2017 |
| Recaf Limited | Hospitality | 2025 |
| Rechdiva Ltd | Wholesale & retail | 2025 |
| Recon Steel Ltd | Construction | 2010 |
| Recstar Group Limited | Administrative & support | 2016 |
| Recsy HR Limited | Information & communication | 2024 |
| Rectory Contracts Ltd | Water & waste | 2018 |
| Rectory Home Improvements Limited | Other services | 2025 |
| Red Apple Catering Limited | Hospitality | 2019 |
| Red Carnation House Ltd | Real estate | 2023 |
| Red Chilli TW Ltd | Hospitality | 2018 |
| Red Dragon Properties Limited | Real estate | 2010 |
| Red Lion Coffee Company Limited | Wholesale & retail | 2015 |
| Red Oakes Limited | Construction | 2020 |
| Red Oakes Property Developments Limited | Real estate | 2025 |
| Red Robin Bakery Ltd | Wholesale & retail | 2020 |
| Red Tree Management Limited | Financial services | 2026 |
| Redbrad Holdings Limited | Financial services | 2024 |
| Reddan Contractors Limited | Construction | 1993 |
| Reddan Group Limited | Construction | 1985 |
| Reddan Limited | Administrative & support | 1990 |
| Redeemed Christian Church of GOD - Temple of Faith | Other services | 2013 |
| Redgold Properties Limited | Real estate | 2021 |
| Rediscovering U Ltd | Administrative & support | 2024 |
| Redkite Capital Group Ltd | Professional & scientific | 2026 |
| Redmans Electronical Door Solutions Ltd | Manufacturing | 2026 |
| Reds Skips Limited | Transport & logistics | 2019 |
| Redsal Services Limited | Manufacturing | 2014 |
| Redspot Transport Ltd | Transport & logistics | 2011 |
| Redstone Electrical Limited | Construction | 2014 |
| Reeder's Interiors Limited | Construction | 2013 |
| Refine PM Ltd | Construction | 2024 |
| Reflections (Basildon) Limited | Other services | 2014 |
| Reflections Cleaning Solutions Ltd | Administrative & support | 2018 |
| Reflective Futures Ltd | Health & social care | 2024 |
| Reformed Minds Community Interest Company | Hospitality | 2025 |
| Refresh Decor Ltd | Construction | 2024 |
| Regal House Lancing Limited | Households | 2021 |
| REGEN8ME Ltd | Other services | 2026 |
| Regg Limited | Health & social care | 2021 |
| Reggees Inn Ltd | Wholesale & retail | 2024 |
| Reggie Smee Pizza & Co Ltd | Real estate | 2020 |
| Reggies Group Ltd | Manufacturing | 2026 |
| Reid’S Roofing Ltd | Construction | 2024 |
| Reigneth Limited | Financial services | 2024 |
| Reilly Railway Engineering Limited | Construction | 2007 |
| Rekha Mistry Limited | Professional & scientific | 2019 |
| Relationship Restoration Ltd | Health & social care | 2023 |
| Reliance Conveyor Services Limited | Manufacturing | 2006 |
| Reliant Leisure Services Ltd | Other services | 2024 |
| Relianz Homes Limited | Real estate | 2025 |
| Remaj Care Recruitment Services Limited | Health & social care | 2014 |
| Remaj Care Solution Limited | Real estate | 2019 |
| Remedial Property Management Limited | Real estate | 2023 |
| Remicare Solutions Ltd | Health & social care | 2024 |
| Remicon Structures Limited | Construction | 2016 |
| Remigo Property Limited | Real estate | 2020 |
| Remora Developments Limited | Construction | 2025 |
| Remora Homes Limited | Construction | 2025 |
| Remote DOC Limited | Health & social care | 2022 |
| Render Specialists Essex Limited | Construction | 2023 |
| Rendering Consultants Holdings Limited | Construction | 2025 |
| Renee Care Holdings Ltd | Hospitality | 2023 |
| Renewable Heating Services Ltd | Construction | 2021 |
| Rennat Limited | Real estate | 2001 |
| RENO44 Limited | Construction | 2023 |
| RENOV8 Interiors Inc Limited | Construction | 2026 |
| Renovar Property Ltd | Construction | 2013 |
| Renovo (West Thurrock) Management Company Limited | Households | 2017 |
| Renowned Alliance Limited | Professional & scientific | 2025 |
| Renowned Performance Ltd | Wholesale & retail | 2021 |
| Renowned Vehicles Limited | Wholesale & retail | 2019 |
| Reorganize Consulting Ltd | Professional & scientific | 2017 |
| Repair Engines Limited | Wholesale & retail | 2026 |
| Report-O-Matic Ltd | Information & communication | 2026 |
| Repton MOT & Service Centre Ltd | Wholesale & retail | 2012 |
| RES North West Limited | Extraterritorial | 2005 |
| RES South Limited | Extraterritorial | 2004 |
| Research Systems Limited | Administrative & support | 2012 |
| Reshape Landscapes Ltd | Administrative & support | 2016 |
| Resiblock (Exports) Ltd | Manufacturing | 2020 |
| Resiblock Limited | Wholesale & retail | 1993 |
| Resigap Ltd | Wholesale & retail | 2011 |
| Respite Mobile Coffee Limited | Hospitality | 2026 |
| Restaurant Ambassador Ltd | Hospitality | 2024 |
| Restoration HQ Ltd | Construction | 2024 |
| Retail Trade & Domestic Limited | Administrative & support | 2010 |
| Rethr Holdings Limited | Professional & scientific | 2021 |
| Rethriive Limited | Manufacturing | 2025 |
| Retina Smart Building Solutions Ltd | Administrative & support | 2020 |
| Reverof Trading Ltd | Wholesale & retail | 2025 |
| Revesto Property Ltd | Real estate | 2025 |
| Reviva Medical Limited | Other services | 2025 |
| Revive & Restore Renovations Limited | Construction | 2025 |