| Rebel Bloodstock Limited | Arts & recreation | 2018 |
| Rebel Capital Limited | Real estate | 2019 |
| Rebel Construction Limited | Construction | 2017 |
| Rebel Estate Management Limited | Real estate | 2020 |
| Rebel Lettings Limited | Real estate | 2022 |
| Rebel Racing Ltd | Arts & recreation | 2014 |
| Rebjul Limited | Information & communication | 2024 |
| Rebond Holdings Ltd | Arts & recreation | 2023 |
| REC Electrical Contractors Limited | Construction | 2008 |
| Recap Distribution Ltd | Wholesale & retail | 2025 |
| Recipebyrosie Limited | Extraterritorial | 2025 |
| Reclaimtech Limited | Information & communication | 2017 |
| Recom Technologies UK Ltd | Energy | 2020 |
| Recova Post Surgery Ltd | Health & social care | 2008 |
| Rectory Fields (Witham) Management Company Limited | Households | 2025 |
| Rectory Place Lexden Limited | Construction | 2018 |
| Recu Ltd | Hospitality | 2025 |
| Recycling Your IT Ltd | Information & communication | 2006 |
| Red Brick Management Services Ltd | Hospitality | 2018 |
| Red Bridge Propco Ltd | Real estate | 2024 |
| Red Confectionery Shop Ltd | Wholesale & retail | 2025 |
| Red Dog Investments Limited | Financial services | 2020 |
| Red Dots Consulting Ltd | Professional & scientific | 2020 |
| Red Lion Kitchen Limited | Hospitality | 2013 |
| Red Lion Witham Ltd | Hospitality | 2010 |
| Red Lyons Business Park Limited | Real estate | 2020 |
| Red Parrot Supplies Limited | Wholesale & retail | 2023 |
| Red Pencil Consulting Limited | Professional & scientific | 2020 |
| Red Pepper Signs Limited | Manufacturing | 2010 |
| Red Power Store Ltd | Other services | 2023 |
| Red Rose Roofing Limited | Construction | 2024 |
| Red Rose Technology Limited | Professional & scientific | 2016 |
| Red Sky Subsea Limited | Professional & scientific | 1999 |
| Red's Specialist Cleaning Ltd. | Construction | 2022 |
| Redbox Partnerships Limited | Professional & scientific | 2011 |
| Redbrook Estate Consulting Limited | Information & communication | 2022 |
| Redbrown Limited | Agriculture & fishing | 2020 |
| Redcliffe Properties Limited | Real estate | 2019 |
| Reddevelop Holdings Limited | Financial services | 2020 |
| Reddevelop Limited | Construction | 2001 |
| Reddys Physiotherapy and Sports Injury Clinic Ltd | Health & social care | 2009 |
| Redeemed Christian Church of GOD Power of Jehovah Essex | Other services | 2015 |
| Redfern Investments LLP | | 2010 |
| Redferns Electrical Limited | Construction | 2005 |
| Redgates Imaging Limited | Health & social care | 2014 |
| Reds Bookkeeping Ltd | Professional & scientific | 2025 |
| Redstone Search Group Ltd | Administrative & support | 2013 |
| Redwood Renewables Ltd | Construction | 2023 |
| Reecreate Building & Landscapes Ltd | Construction | 2025 |
| Reedwelling Limited | Construction | 2020 |
| Reef Automation Limited | Manufacturing | 1986 |
| Reeflex Mind & Motion Limited | Health & social care | 2025 |
| Reel Management Limited | Real estate | 2016 |
| Reenav Medicals Limited | Health & social care | 2010 |
| Reenyretailstore Ltd | Wholesale & retail | 2023 |
| Rees Management Ltd | Professional & scientific | 2014 |
| Refill Town Ltd | Wholesale & retail | 2022 |
| Refine and Resolve Architects Limited | Professional & scientific | 2014 |
| Reflective Limited | Professional & scientific | 2020 |
| Refurbishment Demolition Surveys Ltd | Professional & scientific | 2014 |
| REG Solutions Limited | Construction | 2022 |
| Regal Meridian Holdings Ltd | Real estate | 2026 |
| Regel Cuisine Ltd | Other services | 2019 |
| Regency RTM Company Limited | Households | 2020 |
| Regeneration Media Limited | Information & communication | 2023 |
| Regent Property Services (2015) Limited | Real estate | 2015 |
| Regent UK Workforce Advisory and Acquisition Limited | Administrative & support | 2026 |
| Regina Caeli 1 Limited | Health & social care | 2026 |
| Regnum Electronics Limited | Information & communication | 1999 |
| Regol Services Limited | Construction | 1997 |
| Rehab Hair Ltd | Other services | 2017 |
| Rehman Limited | Health & social care | 2026 |
| Reincarnated Ltd | Hospitality | 2023 |
| Rekindln Limited | Administrative & support | 2025 |
| Relay Creative Limited | Information & communication | 2025 |
| Release and Flow Limited | Other services | 2025 |
| Reli Risk Solutions Ltd | Financial services | 2026 |
| Reliance Employment Construction and Engineering Limited | Professional & scientific | 1998 |
| Relit Solutions Limited | Information & communication | 2013 |
| Relocate Residential Ltd | Real estate | 2018 |
| REM AVE Limited | Real estate | 2024 |
| Remember ME Pet Cremations Ltd | Other services | 2026 |
| Remit TV Limited | Professional & scientific | 2020 |
| Remote SEC Practice Management Ltd | Administrative & support | 2020 |
| Remotebee Ltd | Wholesale & retail | 2025 |
| Remove Sprayfoam Limited | Construction | 2022 |
| Remy’S K9 Coaching Limited | Other services | 2023 |
| Ren-O-Tec Limited | Wholesale & retail | 2008 |
| Renaissance Foundation | Education | 2006 |
| Render-Mar Ltd | Construction | 2024 |
| Rendercraft Essex Ltd | Construction | 2026 |
| Rendlesham Tavern Limited | Hospitality | 2024 |
| Renew Aesthestics & Wellness Centre Ltd | Other services | 2022 |
| Renew-With-Jackie-Dee Ltd | Health & social care | 2025 |
| Renewable Energy Carbon Company Limited | Energy | 2015 |
| Renewable Green Acre Limited | Administrative & support | 2018 |
| Renewable Incentive Centre Limited | Extraterritorial | 2021 |
| Renewed Consult Ltd | Health & social care | 2024 |
| Renitivity Ltd | Arts & recreation | 2023 |
| Rennas Brasserie Ltd | Hospitality | 2026 |