| Roti Darbar Ltd | Hospitality | 2025 |
| Rotolof Services Ltd | Administrative & support | 2021 |
| Roton Power Projects Ltd | Wholesale & retail | 2025 |
| Roubeel.Com Ltd | Wholesale & retail | 2024 |
| Rouf Group Ltd | Administrative & support | 2020 |
| Rough Draft Limited | Hospitality | 2020 |
| Roughcollie Limited | Professional & scientific | 2004 |
| Roughstones Limited | Manufacturing | 2019 |
| Roulette Music Ltd | Information & communication | 2020 |
| Roulstone International Limited | Water & waste | 1961 |
| Round Square London Ltd | Construction | 2019 |
| Round Window London Limited | Administrative & support | 2013 |
| Roundabout ALL Ltd | Information & communication | 2019 |
| Roundbuy Holdings Ltd | Financial services | 2024 |
| Rounded Developments Enterprises Ltd | Professional & scientific | 2002 |
| Roundlabel Limited | Information & communication | 2018 |
| Roundprism Ltd | Information & communication | 2018 |
| Route 66 on Tour Ltd | Hospitality | 2025 |
| Route Konnect Limited | Construction | 2018 |
| Route Master Marine Services Limited | Manufacturing | 2018 |
| Route Sales & Media Limited | Professional & scientific | 2018 |
| ROUTE07 Ltd | Information & communication | 2024 |
| ROUTE369 LAB Ltd | Information & communication | 2021 |
| ROUTE47 CIC | Education | 2023 |
| Routebuddies Limited | Information & communication | 2022 |
| Routes Kilimanjaro Adventures Ltd | Administrative & support | 2025 |
| Rovada Ltd | Education | 2025 |
| Rove Creative Ltd | Manufacturing | 2019 |
| Roverford Imperial L.P. | | 2017 |
| Rovion Limited | Wholesale & retail | 2025 |
| ROW & Harmony International Cleaning Services Ltd | Administrative & support | 2025 |
| Rowalin Property Ltd | Real estate | 2024 |
| Rowan Davies Properties Limited | Real estate | 2019 |
| Rowan Electrical Limited | Construction | 2007 |
| Rowan Enterprises Ltd | Real estate | 2024 |
| Rowan Mill Ltd | Real estate | 2021 |
| Rowan Properties Partnership Ltd | Real estate | 2009 |
| Rowan QS Services Ltd | Construction | 2016 |
| Rowancrest Properties Limited | Real estate | 1972 |
| Rowans Trading Ltd | Professional & scientific | 2022 |
| Rowantree Bar Aberdeen Limited | Other services | 2019 |
| Rowanvale Books Ltd | Information & communication | 2013 |
| Rowe and King Limited | Arts & recreation | 2015 |
| Rowe Property Solutions Limited | Real estate | 2015 |
| Rowe Risk Solutions Limited | Financial services | 2012 |
| Rowfield Commercial Ltd | Professional & scientific | 2013 |
| Rowfield Developments Ltd | Construction | 2022 |
| Rowfield Group Ltd | Professional & scientific | 2018 |
| Rowlands Architecture Ltd | Professional & scientific | 2017 |
| Rowlands Consulting Ltd | Professional & scientific | 2025 |
| Rowlands Property Group Limited | Real estate | 2019 |
| Rowley Retail Limited | Wholesale & retail | 2014 |
| Rownd Ltd | Professional & scientific | 2025 |
| Rowsby Court (Numbers 51-73) RTM Company Limited | Households | 2010 |
| Rowsby Financial Limited | Financial services | 2023 |
| ROX Capitals Ltd | Financial services | 2020 |
| Roxbury MEN Ltd | Wholesale & retail | 2025 |
| Roxbyb Trans Ltd | Transport & logistics | 2020 |
| Roxelana Ltd | Wholesale & retail | 2025 |
| Roxxcover Limited | Wholesale & retail | 2022 |
| Roxybots Ltd | Information & communication | 2016 |
| ROY Sturges Ltd | Wholesale & retail | 2024 |
| Roy's Travels Limited | Transport & logistics | 2021 |
| Roya Hair & Beauty Saloon Ltd | Other services | 2020 |
| Roya Saloon Ltd | Other services | 2019 |
| Royal Antediluvian Order of Buffaloes,Grand Lodge of England Limited | Other services | 1898 |
| Royal Doulton (UK) Limited | Manufacturing | 1898 |
| Royal Welsh College of Music and Drama Limited | Education | 2006 |
| Royall Limited | Extraterritorial | 2012 |
| Royallity Ltd | Other services | 2020 |
| Royally High Limited | Wholesale & retail | 2020 |
| Royalties & Shares Estates Ltd | Real estate | 2023 |
| Royang Ltd | Financial services | 2015 |
| Royax Ltd | Wholesale & retail | 2025 |
| Roybear Limited | Arts & recreation | 2019 |
| Royl Lights & Home Decor Limited | Administrative & support | 2024 |
| Roymark Ltd | Education | 2011 |
| Royzan Ltd | Wholesale & retail | 2024 |
| Rozia Ltd | Wholesale & retail | 2025 |
| Rozyaccs Ltd | Wholesale & retail | 2025 |
| RP Brickwork Ltd | Construction | 2016 |
| RP Telecom Ltd | Information & communication | 2020 |
| RPA Developments Ltd | Extraterritorial | 2009 |
| RPA Finance Limited | Financial services | 2016 |
| RPA Four Ltd | Financial services | 2022 |
| RPA Investments Limited | Other services | 1999 |
| RPA Ltd | Extraterritorial | 2016 |
| RPA Quantity Surveyors Limited | Professional & scientific | 2008 |
| RPA Surveyors Limited | Financial services | 2014 |
| Rpa:Cubic Development Services Ltd | Professional & scientific | 2016 |
| Rpaplus Cymru Limited | Professional & scientific | 2009 |
| RPG Developments (Construction) Ltd | Construction | 2024 |
| Rpgames Ltd | Other services | 2023 |
| RPM Mews Ltd | Real estate | 2026 |
| RPM Parts Ltd | Wholesale & retail | 2025 |
| RPS Consult Ltd | Administrative & support | 2020 |
| RPS Roofing & Property Maintenance Limited | Construction | 2022 |
| Rpscorp Limited | Financial services | 2015 |
| RQ Itsm Consultancy Limited | Administrative & support | 2014 |
| RR & G Limited | Real estate | 2024 |