| RKY Properties Ltd | Real estate | 2020 |
| RL Qabeli Ltd | Hospitality | 2025 |
| RLL Logistics Ltd | Transport & logistics | 2021 |
| RLW Rahmani Ltd | Wholesale & retail | 2024 |
| RM & HZ Autos Ltd | Wholesale & retail | 2026 |
| RM Developments (UK) Ltd | Wholesale & retail | 2009 |
| RM Technologies Ltd | Information & communication | 2013 |
| RMB Heating and Plumbing Limited | Construction | 2018 |
| RMC Rail Services Ltd | Construction | 2022 |
| Rmd-Maria Antofie Ltd | Wholesale & retail | 2021 |
| Rmhm Ltd. | Administrative & support | 2025 |
| RMR GAS & Heating Services Limited | Construction | 2024 |
| RMZ Limited | Transport & logistics | 2023 |
| RND 2023 Limited | Transport & logistics | 2023 |
| Rndtek Ltd | Transport & logistics | 2018 |
| Rnhm Ltd | Wholesale & retail | 2020 |
| RNL Consulting Ltd | Professional & scientific | 2006 |
| RNR Prime Estates Ltd | Real estate | 2025 |
| RO Dragoi Serv Limited | Wholesale & retail | 2018 |
| Road Haulage Training Limited | Education | 2018 |
| Road Rover Haulage Ltd | Transport & logistics | 2025 |
| Roadline Transport Ltd | Administrative & support | 2018 |
| Roar & Rumble Ltd | Wholesale & retail | 2017 |
| Roaseair Logistics Ltd | Transport & logistics | 2016 |
| ROB Decor Ltd | Construction | 2026 |
| ROB Electrical Ltd | Construction | 2018 |
| ROB Waine Dressage Hammer & Harp Ltd | Arts & recreation | 2013 |
| Robert Gamlen Homes (Surbiton) Limited | Real estate | 2005 |
| Robert Sweetzer Services Ltd | Construction | 2025 |
| Roberto Costa (Arches) Limited | Hospitality | 2015 |
| Roberto Costa (Exmouth) Ltd | Hospitality | 2015 |
| Roberto Costa (SW) Limited | Hospitality | 2017 |
| Roberto Costa Restaurants Limited | Financial services | 2015 |
| Roberto Costa Soho Limited | Hospitality | 2021 |
| Roberty Limited | Wholesale & retail | 2024 |
| Robin Biotech Ltd | Wholesale & retail | 2026 |
| Robin Dowling Limited | Information & communication | 2012 |
| Robins Mart Ltd | Wholesale & retail | 2024 |
| Robohr Ltd | Information & communication | 2025 |
| Robomichael Limited | Mining & quarrying | 2019 |
| Robtom Ltd | Transport & logistics | 2016 |
| Rocco Clothing Ltd | Manufacturing | 2026 |
| Roche the Label Ltd | Wholesale & retail | 2025 |
| Rochex Global Ltd | Wholesale & retail | 2018 |
| Rock Properties Limited | Real estate | 1992 |
| Rock Solid Trade Ltd | Wholesale & retail | 2023 |
| Rocket Bats Ltd | Manufacturing | 2025 |
| Rocket Rigging Ltd | Professional & scientific | 2025 |
| Rodi Assets Ltd | Hospitality | 2023 |
| Rogate Property Management Ltd | Households | 2020 |
| Roger Walkden Consulting Ltd | Information & communication | 2024 |
| Rohan Transport Ltd | Transport & logistics | 2026 |
| Roheath Properties Limited | Wholesale & retail | 1989 |
| Rohini Swamy Enterprises Limited | Information & communication | 2015 |
| Rohira Limited | Wholesale & retail | 2026 |
| Rohits Cube Ltd | Information & communication | 2022 |
| Rohnik Limited | Health & social care | 2023 |
| Rohsiks Ltd | Information & communication | 2012 |
| Roja UK Construction Ltd | Construction | 2019 |
| Rojek Electrical Ltd | Construction | 2023 |
| Rokesby Road Management Limited | Real estate | 2009 |
| Roksta Ltd | Construction | 2025 |
| Roll Cage Maintenance Limited | Manufacturing | 2019 |
| Rolling Hearts Care Ltd | Administrative & support | 2018 |
| Roly Foulkes Solutions Ltd | Professional & scientific | 2017 |
| Roma Supply Ltd | Wholesale & retail | 2026 |
| Roman Enterprise Limited | Wholesale & retail | 2018 |
| Roman Roofing Ltd | Construction | 2023 |
| Romana Films London Limited | Information & communication | 2024 |
| Romana Group Ltd | Construction | 2018 |
| Romanian Roots Limited | Arts & recreation | 2025 |
| Romanus Limited | Information & communication | 2012 |
| Romaynun Concierge Ltd | Wholesale & retail | 2025 |
| Ronak Investments Ltd | Real estate | 2019 |
| Ronin Homes Limited | Construction | 2019 |
| Ronin Property Limited | Real estate | 2019 |
| Roofing High Ltd | Construction | 2023 |
| Roofing Masters Limited | Construction | 2022 |
| Roofmaster and Maintenance Limited | Construction | 2026 |
| ROOM54 Ltd | Arts & recreation | 1997 |
| Roomshope.Com Limited | Administrative & support | 2014 |
| Roops Logistics Limited | Transport & logistics | 2022 |
| Roost Maintenance Ltd | Construction | 2022 |
| Rooster Point Ltd | Hospitality | 2024 |
| Roots and Wings Travel Limited | Information & communication | 2017 |
| Roper Curzon Limited | Construction | 2016 |
| Rory Sheehan Payroll Services Ltd | Professional & scientific | 2014 |
| Rorywritesuk Ltd | Arts & recreation | 2021 |
| Rosario's Market Kitchen Limited | Hospitality | 2025 |
| Roscreeding Ltd | Construction | 2023 |
| Rose Day Care Nursery Limited | Education | 2024 |
| Rose Garden Motors Limited | Wholesale & retail | 2021 |
| Roseger Limited | Administrative & support | 2003 |
| Roselea Court (Stirling) Care Limited | Health & social care | 2023 |
| Roselight Services Limited | Health & social care | 2016 |
| Rosewood Property Ltd | Real estate | 2016 |
| Roshni Food & Wine Limited | Wholesale & retail | 2007 |
| Roshni Supermarket Ltd | Wholesale & retail | 2015 |
| Roshni Wine Palace Ltd | Wholesale & retail | 2018 |
| Rospower Projects Limited | Construction | 2024 |