| Roderick Shelton Ltd | Professional & scientific | 2002 |
| Rodger Ketley Limited | Construction | 2013 |
| Rodh Consultancy Services Ltd | Professional & scientific | 2023 |
| Roding Heights Management Company Limited | Professional & scientific | 2016 |
| Rodney Black Design Studios Limited | Professional & scientific | 1996 |
| Rofinery Ltd | Information & communication | 2025 |
| Rofro Services Limited | Professional & scientific | 2026 |
| Rogan-Lyons Ltd | Manufacturing | 2009 |
| Roger a. Balmer Ltd | Professional & scientific | 1999 |
| Roger Balmer Management Ltd | Professional & scientific | 2004 |
| Roker Group Ltd | Construction | 2015 |
| Rokkam Asset Management Ltd | Real estate | 2014 |
| Rokkam Group Ltd | Financial services | 2025 |
| Rokkam Limited | Professional & scientific | 2008 |
| ROL Cruise Holdings Limited | Financial services | 2013 |
| ROL Cruise Trustees Limited | Administrative & support | 2024 |
| Rola Cargo & Logistics Limited | Transport & logistics | 2026 |
| Rolco Advisory Limited | Administrative & support | 2024 |
| Rolfe & Johnson Homedressers Limited | Professional & scientific | 2023 |
| Rollo Wealth Management Ltd | Professional & scientific | 2016 |
| Roman Cars (Colchester) Ltd | Transport & logistics | 2018 |
| Roman Coaches (Colchester) Limited | Transport & logistics | 2018 |
| Roman Contractors Limited | Construction | 2002 |
| Roman Homes LLP | | 2013 |
| Roman Panda Limited | Financial services | 2018 |
| Roman River Beekeeping Company Ltd | Agriculture & fishing | 2024 |
| Roman River Coffee Company Ltd | Wholesale & retail | 2025 |
| Roman River Trees Ltd | Agriculture & fishing | 2021 |
| Roman Wall RTM Company Limited | Households | 2022 |
| Romani Consultancy Ltd | Construction | 2007 |
| Rombuild Ltd | Real estate | 2011 |
| Romcass Property Limited | Real estate | 2025 |
| Romelec Limited | Information & communication | 2007 |
| Ronimix Concrete Ltd | Manufacturing | 2016 |
| Ronimix Property Company Ltd | Real estate | 2026 |
| Ronimix Readymix Ltd | Manufacturing | 2017 |
| Ronnie Dixon Ltd | Professional & scientific | 2020 |
| Ronnx Limited | Wholesale & retail | 2025 |
| Roobee Holdings Ltd | Financial services | 2025 |
| Roofline and Cladding Solutions Limited | Construction | 2018 |
| Rook B&K Ltd | Administrative & support | 2024 |
| Rookoku Ltd | Information & communication | 2019 |
| Rookwood Farm Limited | Agriculture & fishing | 2025 |
| ROOT40 Ltd | Real estate | 2026 |
| Rosabelle Solutions Limited | Professional & scientific | 2026 |
| Rose and Law Property Limited | Construction | 2026 |
| Rose Developers Ltd | Construction | 2021 |
| Rose Elliott Studio Limited | Arts & recreation | 2019 |
| Rose of Colchester Limited | Manufacturing | 1956 |
| Rose Tinsley Consulting Ltd | Information & communication | 2024 |
| Rose Van O. Ltd | Professional & scientific | 2022 |
| Rose Windows Ltd | Construction | 2016 |
| Rosebank Freehold Limited | Households | 2007 |
| Rosebay House (Friern Park) Management Company Limited | Households | 2017 |
| Roselands Limited | Real estate | 2015 |
| Rosemary Mitchell Consulting Ltd | Professional & scientific | 2026 |
| Rosetta Marie Ltd | Real estate | 2020 |
| Roseville Decorating Contractors Ltd | Construction | 2018 |
| Rosewood Holdings Limited | Construction | 1987 |
| Rosewood Homes Limited | Extraterritorial | 1966 |
| Rosper Estates Limited | Real estate | 1998 |
| Ross Barton Flooring Limited | Construction | 2026 |
| Ross Francis Consultancy Ltd | Information & communication | 2019 |
| Ross Secure Employment Ltd | Real estate | 2025 |
| Ross Secure Ltd | Real estate | 2025 |
| Ross Secure Services Ltd | Real estate | 2025 |
| Ross Taylor Hair Design Ltd. | Education | 2018 |
| Rosslyn Gomes Limited | Administrative & support | 2022 |
| Roth Transportation Ltd | Transport & logistics | 2024 |
| Rothwell Tree Services Ltd | Agriculture & fishing | 2024 |
| Roule Ltd | Wholesale & retail | 2024 |
| Route 66 American Food Ltd | Hospitality | 2019 |
| Rowan Place (Colchester) Management Company Limited | Real estate | 2001 |
| Rowan ST John Ltd | Professional & scientific | 2025 |
| Rowan Tree Learning Ltd | Education | 2024 |
| Rowboat Ltd | Professional & scientific | 2024 |
| Rowhedge Properties Limited | Real estate | 2010 |
| Rowhedge Wharf Residents Management Company Ltd | Real estate | 2016 |
| ROX Properties Ltd | Real estate | 2020 |
| Roxby Trading LP | | 2018 |
| Roxwell Associates Ltd | Professional & scientific | 2022 |
| Royle Data Development Ltd | Information & communication | 1998 |
| Royston House RTM Company Limited | Households | 2014 |
| RP NO.1 Ltd | Construction | 2018 |
| RP Scaffolding Services Ltd | Construction | 2019 |
| RP Water Treatments Limited | Other services | 2024 |
| Rp-Resale Ltd | Wholesale & retail | 2022 |
| RPC Building Services Limited | Construction | 2021 |
| RPM Limited | Other services | 2020 |
| RPM Performance Rally World Ltd | Wholesale & retail | 2013 |
| RPS Engineering (Colchester) Limited | Manufacturing | 2019 |
| RPS Workshop Consumables Limited | Wholesale & retail | 2014 |
| RR Essex Ltd | Hospitality | 2023 |
| RR Investment Group Ltd | Real estate | 2024 |
| RR Software Technologies Limited | Information & communication | 2011 |
| Rrha Ltd | Transport & logistics | 2026 |
| RRS 2021 Limited | Administrative & support | 2021 |
| RS 777 Ltd | Construction | 2021 |
| RS Finishing Ltd | Construction | 2021 |
| RS Hydraulics Limited | Other services | 2001 |