| Rocks Plant Hire Ltd | Administrative & support | 2022 |
| Rockset Limited | Real estate | 1996 |
| Rockspark Limited | Real estate | 2014 |
| Rocky Cleaning Ltd | Administrative & support | 2024 |
| Rocky's Fast Food Enterprises Limited | Hospitality | 1993 |
| Rockys Hounslow Limited | Real estate | 2009 |
| Roconect CIC | Education | 2019 |
| Rocque Associates Ltd | Administrative & support | 2013 |
| Rocsearch One Limited | Professional & scientific | 2000 |
| Rodixin Limited | Transport & logistics | 2018 |
| Rodney Brooks Limited | Wholesale & retail | 2021 |
| ROE Green Builders Limited | Other services | 1997 |
| ROE Green Sales & Marketing Ltd | Wholesale & retail | 2021 |
| ROE Green Windows Limited | Other services | 2000 |
| Roehampton Lane One Residents Management Company Limited | Professional & scientific | 2007 |
| Roehampton Lane Residents Company Limited | Households | 2007 |
| Roffe Holdings Limited | Financial services | 2026 |
| Rogalik Ltd | Manufacturing | 2024 |
| Roger Smith Associates Limited | Manufacturing | 2001 |
| Rogue Artworks Ltd | Manufacturing | 2025 |
| Rogue Ignite Limited | Professional & scientific | 2018 |
| Roguewear Limited | Professional & scientific | 2025 |
| Rohansi Parekh Design Studio Ltd | Professional & scientific | 2025 |
| Rohanvest Limited | Financial services | 2025 |
| Rohishan Limited | Financial services | 2025 |
| Rohnee Ltd | Construction | 2022 |
| Rohnik Investments Ltd | Real estate | 2020 |
| ROI Labs Solutions Ltd | Information & communication | 2023 |
| Roisocial Limited | Professional & scientific | 2017 |
| Roka Properties (South East) Ltd | Extraterritorial | 2015 |
| Rokitch Ltd. | Manufacturing | 2017 |
| Roko Healthcare Limited | Health & social care | 2015 |
| Rolak Medical Ltd | Professional & scientific | 2026 |
| Rolens Online Limited | Wholesale & retail | 2024 |
| Rolling Properties Limited | Construction | 2018 |
| Roma Building Ltd | Construction | 2023 |
| Romanian Business Club Limited | Professional & scientific | 2024 |
| Romeo B Ltd | Transport & logistics | 2017 |
| Romex Limited | Real estate | 1995 |
| Romline Limited | Real estate | 2017 |
| Romsoft Construct Ltd | Construction | 2019 |
| RON Shane Lighting Services Limited | Other services | 2009 |
| Rona Kelly Digital Limited | Professional & scientific | 2024 |
| Ronald YEP & Co Limited | Professional & scientific | 2003 |
| Ronalydo Ltd | Manufacturing | 2026 |
| Roni LUX Ltd | Real estate | 2023 |
| Roniel Sports UK Ltd | Professional & scientific | 2026 |
| Ronik Electrical Limited | Construction | 2015 |
| Ronnie's Collection London Ltd | Wholesale & retail | 2025 |
| Roodenburgh Security Limited | Administrative & support | 2018 |
| Rooibos Ltd | Other services | 2020 |
| Rookmay Limited | Information & communication | 2002 |
| Room 40 Ltd | Information & communication | 2013 |
| Room Temperature Solution Limited | Construction | 2024 |
| Rooster Kilburn Limited | Hospitality | 2024 |
| Rooster Properties Ltd | Real estate | 2020 |
| Rooster’S Choice Ltd | Hospitality | 2025 |
| Root Accountants Ltd | Professional & scientific | 2014 |
| Root Concierge Ltd | Transport & logistics | 2023 |
| Roots Foundation | Other services | 2006 |
| Rootvive Ltd | Agriculture & fishing | 2025 |
| Ropery Limited | Construction | 2021 |
| Roro Egames Ltd | Manufacturing | 2025 |
| Roro Online Ltd | Manufacturing | 2025 |
| Roro Solutions (London) Ltd | Wholesale & retail | 2021 |
| ROS Construction Services Ltd | Construction | 2009 |
| Rosa Renovators Ltd | Construction | 2014 |
| Rosalily Limited | Wholesale & retail | 2024 |
| Roscopp Ltd | Construction | 2025 |
| Rose and Samite Bridal Boutique Ltd | Wholesale & retail | 2024 |
| Rose Cleaning Ltd | Other services | 2015 |
| Rose Connect Ltd | Construction | 2025 |
| Rose Flowers & Co Limited | Wholesale & retail | 2025 |
| Rose Gold Rentals Ltd | Administrative & support | 2017 |
| Rose Green 786 Ltd | Wholesale & retail | 2025 |
| Rose OJO Limited | Wholesale & retail | 2024 |
| Rose Properties Harrow Limited | Real estate | 2025 |
| Rose Quartz (London) Ltd | Health & social care | 2020 |
| Rose Quartz Ltd | Real estate | 2016 |
| Rosebud Consultancy Limited | Professional & scientific | 2006 |
| Rosebuild Renovations Ltd | Construction | 2026 |
| Rosedene Villa Management Limited | Real estate | 2002 |
| Rosefinch Associates Limited | Professional & scientific | 2025 |
| Rosemark International Education Limited | Extraterritorial | 2012 |
| Rosemead Ventures Limited | Extraterritorial | 2012 |
| Rosenbelle London Ltd | Wholesale & retail | 2020 |
| Rosenberg Capital Limited | Real estate | 2025 |
| Rosenberry Holdings Limited | Hospitality | 2023 |
| ROSEQUARTZ1 Limited | Wholesale & retail | 2026 |
| Roses Lions and Stars Limited | Administrative & support | 2024 |
| Rosevale Limited | Administrative & support | 2025 |
| Rosewood Aligner Ltd | Health & social care | 2023 |
| Rosewood Properties London Limited | Real estate | 2012 |
| Rosewood Residential Care Ltd | Health & social care | 2026 |
| Rosh Studio Ltd | Wholesale & retail | 2025 |
| Roshan Travel Limited | Administrative & support | 2021 |
| Roshh Ltd | Financial services | 2014 |
| Roshni Ladva Ltd | Other services | 2017 |
| Roshni Photography Ltd | Professional & scientific | 2023 |
| Roshni Thakrar GP Ltd | Health & social care | 2022 |