| Rallysport Automotive Limited | Wholesale & retail | 2015 |
| Rallysport Automotive SC Limited | Wholesale & retail | 2019 |
| Rallysport Engineering Academy C.I.C. | Education | 2012 |
| Ralphs Roofing Limited | Construction | 2017 |
| RAM Financial Services Ltd | Administrative & support | 2019 |
| Rambler Holdings Limited | Real estate | 2017 |
| Ramparts Management Colchester Limited | Other services | 1993 |
| Ramsayholmes Ltd | Construction | 2011 |
| Ramsey Hill Property Management Ltd | Real estate | 2025 |
| Ramsnest Ltd. | Construction | 2018 |
| Ranch Marketing Limited | Information & communication | 2021 |
| RANDOLPHY1 Limited | Health & social care | 2023 |
| Rangebow Ltd | Wholesale & retail | 2014 |
| RANK4AI Ltd | Professional & scientific | 2025 |
| Rannoch Scott Drinks Distributors Ltd | Wholesale & retail | 2006 |
| Ranpen Healthcare Limited | Health & social care | 2014 |
| Ransome Engineering Services Limited | Transport & logistics | 1981 |
| Ransome Property Services Limited | Real estate | 2019 |
| RAO and Elliott Limited | Information & communication | 2024 |
| Rapid Circle UK Ltd | Professional & scientific | 2022 |
| Rapid Electronics Holdings Limited | Financial services | 2010 |
| Rapid Electronics Limited | Wholesale & retail | 1980 |
| Rapid Properties Limited | Real estate | 2010 |
| Rapid Response Maintenance Ltd | Construction | 2006 |
| Rapport Recruitment Ltd | Administrative & support | 2024 |
| Raptor Medical Ltd | Health & social care | 2021 |
| Rarg Limited | Real estate | 2007 |
| RAS Consultancy Services Ltd | Real estate | 2024 |
| Rashid Holdings and Investments Limited | Construction | 2019 |
| Rathgar Property Company Limited | Real estate | 1937 |
| Rattle Productions Limited | Information & communication | 2015 |
| Raul Cars Essex Limited | Transport & logistics | 2025 |
| Raul Trading Essex Limited | Wholesale & retail | 2025 |
| Ravello Contracts Limited | Construction | 2025 |
| Raven Boat Co. Ltd | Extraterritorial | 2025 |
| Ravenhill Media Limited | Professional & scientific | 2010 |
| Ravenscroft Heathcote 2 Ltd | Professional & scientific | 2021 |
| Ravenswood Flats Limited | Households | 1980 |
| RAW Cement Ltd | Wholesale & retail | 2024 |
| Rawco Limited | Wholesale & retail | 2024 |
| Rawe Energy Services Limited | Extraterritorial | 2021 |
| RAY Landscapes Ltd | Administrative & support | 2022 |
| RAY Ricks Consultancy Ltd | Professional & scientific | 2014 |
| RAY Wicks Consultant Services Limited | Construction | 2021 |
| Ray's Subs & Company Limited | Hospitality | 2011 |
| Rayco Holdings Ltd | Real estate | 2025 |
| Rayfield Properties Limited | Real estate | 2000 |
| Rayleigh Plumbing & Heating Ltd | Construction | 2017 |
| Raymond Finance Limited | Financial services | 1963 |
| Rayne Place Developments Ltd | Construction | 2023 |
| Raynes Park Barns Limited | Construction | 2025 |
| Raysea Limited | Wholesale & retail | 2024 |
| Raze Recycling Ltd | Wholesale & retail | 2017 |
| Raztak Limited | Hospitality | 2019 |
| RB Financial Advisers Ltd | Financial services | 2016 |
| RB Motors Limited | Wholesale & retail | 2002 |
| RBC 123 Ltd | Professional & scientific | 2011 |
| RBC for Business Ltd | Administrative & support | 2023 |
| RBR Housing Limited | Real estate | 2015 |
| RBS Accountancy Limited | Professional & scientific | 2001 |
| RBW8 Limited | Administrative & support | 2025 |
| RC Accounting and Business Support Ltd | Professional & scientific | 2011 |
| RC Tries Ltd | Wholesale & retail | 2024 |
| Rcde Ltd | Financial services | 2023 |
| Rcnc Property Ltd | Real estate | 2018 |
| Rcndorse Ltd | Wholesale & retail | 2018 |
| Rcph Ltd | Administrative & support | 2020 |
| RCT Dj's & Entertainers Ltd | Administrative & support | 2025 |
| RCT Entertainment & Events Ltd | Administrative & support | 2023 |
| RCT Wedding Decor Hire Ltd | Other services | 2025 |
| RCW Heating Limited | Construction | 2017 |
| RCW Performance Limited | Wholesale & retail | 2024 |
| RD Light and Power Ltd | Construction | 2022 |
| RD Roofing & Cladding Limited | Construction | 2025 |
| RD Technosoft Limited | Information & communication | 2018 |
| Rdhdraughting Ltd | Professional & scientific | 2018 |
| RDO Building Services Ltd | Construction | 2024 |
| RDP Consulting (Chelmsford) Limited | Professional & scientific | 2003 |
| RDP Consulting Ltd | Professional & scientific | 1996 |
| RDP EOT Limited | Extraterritorial | 2023 |
| RDS Development Services Limited | Construction | 2015 |
| RDS Search Ltd | Other services | 2026 |
| Rdscl Limited | Professional & scientific | 2018 |
| Re-Breath CIC | Health & social care | 2024 |
| Re-Cycle | Water & waste | 1997 |
| Reach Digital Ltd | Information & communication | 2014 |
| React Homecare Ltd | Health & social care | 2012 |
| Reactive M&E Services Ltd | Construction | 2022 |
| Reade Finance Limited | Financial services | 2011 |
| Reader Offers Limited | Arts & recreation | 1995 |
| Readers Offers Limited | Professional & scientific | 2008 |
| Real Business Entertainment CIC | Arts & recreation | 2025 |
| Real Estate DOM. Ltd | Real estate | 2021 |
| Real World Learning Ltd | Professional & scientific | 2012 |
| Reality Craft Ltd | Information & communication | 2026 |
| Realtunity Ltd | Real estate | 2018 |
| Reaphsoft Systems Ltd | Information & communication | 2024 |
| REBBARBER2024 Ltd | Other services | 2024 |
| Rebecca Your Virtual Assistant Limited | Administrative & support | 2023 |
| Reboot Media Ltd | Other services | 2011 |