| Rival Maintenance Group Ltd | Construction | 2016 |
| Rival Mechanical Limited | Construction | 2018 |
| River Colne Development Limited | Construction | 2001 |
| River Colne Food Co. Limited | Hospitality | 2020 |
| River House Montessori School Limited | Education | 1994 |
| Riverale Media Ltd | Manufacturing | 2024 |
| Riverbank Partners MGT Ltd | Real estate | 2024 |
| Riverbank RTM Company Limited | Households | 2009 |
| Riverdale (Avenue) Management Company Limited | Households | 2005 |
| Riverdale (Collector's House) Management Company Limited | Real estate | 2004 |
| Riveredge Solutions Ltd | Wholesale & retail | 2024 |
| Riverleaf Limited | Construction | 2023 |
| Rivermill Lofts Management Company Limited | Households | 2017 |
| Riverside Auto Factors Limited | Administrative & support | 2002 |
| Riverside Bottling Limited | Manufacturing | 2010 |
| Riverside Hotel Colchester Ltd | Hospitality | 2021 |
| Riverside Maltings Limited | Other services | 1985 |
| Riverside Nursery (Colchester) Number 1 Management Company Limited | Households | 2004 |
| Riviera Drinks Limited | Professional & scientific | 2011 |
| Rivu Club Limited | Wholesale & retail | 2023 |
| Riya Elite Ltd | Hospitality | 2025 |
| Riyasat Restaurant Ltd | Hospitality | 2025 |
| RJB Limited | | 1981 |
| RJB Roofing Limited | Construction | 2024 |
| RJH Maintenance Limited | Administrative & support | 2013 |
| RJL Group Contracts Ltd | Construction | 2022 |
| RJL Group Ltd | Construction | 2019 |
| RJR Building Solutions Ltd | Construction | 2024 |
| RJS Investments Limited | Real estate | 2007 |
| RJS Ninjas Ltd | Information & communication | 2022 |
| Rjscb Wheeler Limited | Financial services | 2025 |
| RK Legal Recruitment Limited | Administrative & support | 2012 |
| RK Waste Clearance Ltd | Water & waste | 2024 |
| Rkbr Industrial Roofing (Essex) Limited | Construction | 2025 |
| Rkbr Industrial Roofing Ltd | Construction | 2021 |
| Rkbr Property Investments Ltd | Real estate | 2023 |
| RKH Sons Limited | Administrative & support | 2019 |
| Rksgb Consulting Ltd | Financial services | 2019 |
| RKV Technology Limited | Information & communication | 2022 |
| RLC Partners Ltd | Real estate | 2024 |
| RLT Chots Ltd | Financial services | 2025 |
| RLT Engineering Consultants Ltd. | Professional & scientific | 1990 |
| RM Square Ltd | Wholesale & retail | 2024 |
| RMC Electrical Installations Limited | Construction | 2026 |
| Rmclamp Limited | Real estate | 2025 |
| RMK Chisnall Ltd | Administrative & support | 2023 |
| RMM RTM Company Limited | Households | 2004 |
| Rmpa Holdings Limited | Financial services | 2003 |
| Rmpa Nominees Limited | Professional & scientific | 2003 |
| Rmpa Services PLC | Administrative & support | 2003 |
| RN Electrical Ltd | Construction | 2017 |
| Rnbbrunchessex Limited | Hospitality | 2025 |
| RNT Home Solutions Ltd | Construction | 2022 |
| RO & LDL Services Limited | Construction | 2021 |
| Road Corporation Ltd | Professional & scientific | 2024 |
| Road Haulage Services Ltd | Transport & logistics | 2016 |
| Road Holdings Ltd | Financial services | 2023 |
| Roadster Fit Auto Traders Ltd | Wholesale & retail | 2025 |
| Roasted & Posted Coffee Club Ltd | Wholesale & retail | 2025 |
| Roaw Renewables Group Limited | Construction | 2023 |
| ROB Martins Assessment Services Ltd | Professional & scientific | 2021 |
| ROB Troy Property Services Limited | Real estate | 2013 |
| ROB Ward Electrical Services Ltd | Construction | 2011 |
| Roberge (Group) Limited | Financial services | 2013 |
| Roberge Brickworks Limited | Construction | 2002 |
| Roberge Developments Limited | Construction | 2013 |
| Robert Ashworth Limited | Financial services | 2019 |
| Robert Crick Site Engineering and Land Surveys Limited | Professional & scientific | 2011 |
| Robert Davidson & SON Ltd | Agriculture & fishing | 2010 |
| Robert Day Associates Limited | Real estate | 2007 |
| Robert Hobson Wealth Management Limited | Financial services | 2014 |
| Robert J Hunt Limited | Construction | 2011 |
| Roberts Country Vehicles (South East) Limited | Professional & scientific | 1999 |
| Robin Dand Commodities Limited | Agriculture & fishing | 2013 |
| Robin Godden Lead Limited | Construction | 2012 |
| Robin Whelan Consulting Limited | Professional & scientific | 2000 |
| Robinson Arnold Limited | Administrative & support | 2021 |
| Robinson Mortgages Ltd | Financial services | 2025 |
| ROC Immo Ltd | Real estate | 2024 |
| Roccomax Ltd | Wholesale & retail | 2026 |
| Rochester Court Management Limited | Real estate | 2005 |
| Rock Core Ltd | Construction | 2021 |
| Rock Estates Suffolk Limited | Real estate | 2022 |
| Rock Fuel Innovations Ltd | Professional & scientific | 2012 |
| Rock Robertson Hesler Group Holdings Limited | Professional & scientific | 2021 |
| Rock the Dock Ltd | Hospitality | 2023 |
| Rock Triplex Limited | Administrative & support | 2020 |
| Rockbond SCP Limited | Manufacturing | 1994 |
| Rockbroon Limited | Agriculture & fishing | 2023 |
| Rocket Science Properties Ltd | Administrative & support | 2022 |
| Rocketship Events Ltd | Arts & recreation | 2024 |
| Rockett Property Developments Limited | Real estate | 2022 |
| Rockinghams Farms Limited | Agriculture & fishing | 1980 |
| Rocks & Rubies (Online) Ltd | Wholesale & retail | 2020 |
| Rocksurgeon Ltd | Health & social care | 2022 |
| Rocktops Ltd | Manufacturing | 2025 |
| Rocky's Pet Care Limited | Other services | 2018 |
| Rocla Holdings Limited | Financial services | 2019 |
| Rodam Services Ltd | Transport & logistics | 2018 |
| Roderick Shelton Investments Ltd | Professional & scientific | 2004 |