| Rochetts Apartments Residents Company Limited | Real estate | 1984 |
| Rochetts Estate Management Limited | Real estate | 1984 |
| Rock Legal Search Limited | Professional & scientific | 2020 |
| Rock M D S Limited | Administrative & support | 2013 |
| Rock Steady Safety Ltd | Construction | 2015 |
| Rocket Support and Care Limited | Health & social care | 2019 |
| Rocking Horse Photography Ltd | Professional & scientific | 2015 |
| Rockins London Ltd | Wholesale & retail | 2014 |
| Rockman Management Limited | Hospitality | 2026 |
| Rockman Residences Limited | Hospitality | 2025 |
| Rockman Stays Limited | Hospitality | 2023 |
| Rockwell Hub Ltd | Real estate | 2016 |
| Rockwool Umbrella Solutions Ltd | Construction | 2025 |
| Rocky Builders & Landscapers Limited | Construction | 2021 |
| Rockzea Limited | Real estate | 2025 |
| ROF UK Ltd | Wholesale & retail | 2025 |
| Roger Drylining Ltd | Construction | 2018 |
| Rohi Group Ltd | Information & communication | 2026 |
| Roland James Limited | Real estate | 1993 |
| Rolfe Developments Ltd | Professional & scientific | 2022 |
| Rollings Commercial Limited | Wholesale & retail | 1936 |
| ROM Valley Glass & Glazing Ltd | Construction | 2020 |
| Roman Boilers Ltd. | Construction | 2023 |
| Roman Ravello Limited | Real estate | 2020 |
| Roman Roads Limited | Construction | 2003 |
| Romax Industrial Ltd | Administrative & support | 2018 |
| Romax Site Services Limited | Administrative & support | 2016 |
| Romenter Ltd | Wholesale & retail | 2025 |
| Romford Flat Roofing Ltd | Construction | 1997 |
| Romoda Group Limited | Financial services | 2024 |
| Romoda Limited | Construction | 2020 |
| Roofway Roofing & Building Ltd | Construction | 2024 |
| Rookthorn Ltd | Administrative & support | 2026 |
| ROOMS108 Limited | Real estate | 2019 |
| Rooney Tours Limited | Administrative & support | 2024 |
| Root AI ID Ltd | Professional & scientific | 2025 |
| Roquebrook PM Limited | Administrative & support | 2012 |
| Rose Roofing & Guttering Services Limited | Construction | 2011 |
| Rose Valley (Brentwood) Limited | Households | 2003 |
| Rose Valley Management Company Limited | Real estate | 1991 |
| Roseborough Limited | Professional & scientific | 2000 |
| Rosebud Advisory Limited | Professional & scientific | 2024 |
| Rosevior Ltd | Wholesale & retail | 2025 |
| Rosewood (Maidstone) Managing Company Limited | Households | 2022 |
| Rosie Lane Ltd | Wholesale & retail | 2020 |
| Rosspark Management Limited | Households | 1993 |
| Rothenberg Transport Ltd | Transport & logistics | 2014 |
| Rotor Torque Limited | Professional & scientific | 2019 |
| Roundtable Solutions Ltd | Professional & scientific | 2022 |
| Roundwood Lake Limited | Households | 1994 |
| Rover P4 Drivers Guild Limited | Other services | 2016 |
| Rovil Limited | Construction | 2017 |
| Rowan Traders Limited | Extraterritorial | 2012 |
| Rowntree Ventures Limited | Real estate | 2011 |
| Royale Rasoi Foods Ltd | Hospitality | 2024 |
| Royam Property Services Ltd | Real estate | 2026 |
| Roycroft Distribution Limited | Extraterritorial | 2016 |
| RP HUN Ltd | Transport & logistics | 2018 |
| RP15 Events Ltd | Arts & recreation | 2016 |
| RP15 Media Ltd | Information & communication | 2016 |
| RP2 Limited | Manufacturing | 1991 |
| RPM Combustion Engineering Ltd. | Professional & scientific | 2014 |
| RR Project Controls Ltd | Professional & scientific | 2024 |
| Rram Renovations Ltd | Construction | 2020 |
| RRJ Global Ltd | Financial services | 2022 |
| RRP Investments Ltd | Real estate | 2019 |
| RS Air Conditioning Ltd | Construction | 2022 |
| RS Managing Agency Limited | Financial services | 2015 |
| RS Solar Energy Limited | Construction | 2025 |
| RS2 Properties Limited | Real estate | 2017 |
| Rsbo Homes Ltd | Real estate | 2022 |
| RSS25 Limited | Professional & scientific | 2013 |
| RSS25 Property Management Ltd | Real estate | 2017 |
| Rstf Ltd | Real estate | 2021 |
| RTD Consultancy Ltd | Administrative & support | 2014 |
| Rtkshop Limited | Wholesale & retail | 2022 |
| RTL Europe Delivery UK Ltd | Transport & logistics | 2021 |
| RTS Building & Maintenance Ltd | Construction | 2017 |
| Rubi Wholefoods Ltd | Manufacturing | 2023 |
| Rubicon Technology Ltd | Information & communication | 2026 |
| Ruby Roofing Essex & London Ltd. | Construction | 2020 |
| Rufus Music Publishing Ltd | Other services | 2004 |
| Runway Nexus Ltd | Information & communication | 2026 |
| Rupert & Shakir Ltd | Wholesale & retail | 2024 |
| Rupert's Property Ltd | Real estate | 2021 |
| Rushworth Financial Limited | Professional & scientific | 2018 |
| Ruskins Trees & Soil Biology Ltd | Administrative & support | 2003 |
| RW18 Consultancy Limited | Professional & scientific | 2022 |
| Ryecroft Property Investments Limited | Real estate | 2024 |
| Ryly Ltd | Professional & scientific | 2024 |
| RYN Services Support Limited | Administrative & support | 2025 |
| RYN Site Services Limited | Construction | 2024 |
| Ryt-Source Mechanical Ltd | Construction | 2024 |
| Rz&A Trans Ltd | Wholesale & retail | 2025 |
| S & D Accountancy Services Limited | Professional & scientific | 2012 |
| S & D Motorcycles Limited | Wholesale & retail | 2006 |
| S & G (Smith) Limited | Professional & scientific | 2010 |
| S & J Building & Developers Limited | Construction | 2022 |
| S & J Land & Properties Ltd | Real estate | 2023 |
| S & J Padfield & Partners LLP | | 2013 |