| Romeodriving Ltd | Transport & logistics | 2020 |
| Romi Tattoo Artist Ltd | Other services | 2020 |
| Romman Limited | Hospitality | 2020 |
| Romuel One Ltd | Construction | 2024 |
| Romway Investments Limited | Real estate | 2016 |
| RON Bradley Buildings Limited | Construction | 2008 |
| Ron's Cafe Ltd | Hospitality | 2025 |
| Ronak Kitchens & Bedrooms Ltd | Manufacturing | 2016 |
| Ronald E. Lovering & SON Limited | Professional & scientific | 1993 |
| Ronda Enviro-Vac Ltd. | Manufacturing | 1983 |
| Ronit Minhas Ltd | Transport & logistics | 2024 |
| Ronnie Drum Ltd | Arts & recreation | 2022 |
| Ronto Limited | Construction | 2025 |
| Ronz Ltd | Wholesale & retail | 2013 |
| ROO Scaffolding Services Ltd | Construction | 2022 |
| Roof Lanterns Direct Limited | Wholesale & retail | 2016 |
| Roof Tiles Direct Limited | Professional & scientific | 1951 |
| Roof-Maker Holdings Limited | Financial services | 2023 |
| Roof-Maker Ltd | Manufacturing | 2016 |
| Roof-Maker Securities Limited | Financial services | 2023 |
| Rooffellas Ltd | Construction | 2019 |
| Roofing Legacy Ltd | Construction | 2020 |
| Roofmaster and Cladding Limited | Construction | 2011 |
| Roofwise (UK) Limited | Construction | 1999 |
| Rookasbrand [Fashion & Lifestyle] Limited | Wholesale & retail | 2025 |
| Rookery Foods Limited | Hospitality | 2001 |
| Rookery Holdings Limited | Hospitality | 2003 |
| Rookwith Ltd | Transport & logistics | 2015 |
| Room 121 Ltd | Health & social care | 2013 |
| Room 2 Dream Ltd | Hospitality | 2022 |
| Roomformore Ltd | Hospitality | 2021 |
| Roomis Ltd | Health & social care | 2024 |
| Roonio Limited | Information & communication | 2022 |
| Roost Bagshot Ltd. | Wholesale & retail | 2017 |
| Roost Farnham Ltd | Wholesale & retail | 2019 |
| Rooster Fried Chicken Limited | Hospitality | 2014 |
| Rooster's Emporium Ltd | Wholesale & retail | 2026 |
| Roosters Grill Ltd | Hospitality | 2017 |
| Root 3 Electrical Design Limited | Administrative & support | 2008 |
| Root Millers Limited | Wholesale & retail | 2018 |
| Root Modo Limited | Information & communication | 2014 |
| Root Store Ltd | Wholesale & retail | 2017 |
| ROOT2 Tax Limited | Professional & scientific | 2011 |
| ROOT3 Tax Limited | Professional & scientific | 2009 |
| Rooted Care and Growth Ltd | Health & social care | 2025 |
| Rootes Properties Ltd | Real estate | 2023 |
| Rootglow Limited | Manufacturing | 2024 |
| Roots and Play Limited | Extraterritorial | 2024 |
| Roots Healthcare 1 Limited | Health & social care | 2025 |
| Roots Healthcare 2 Limited | Real estate | 2023 |
| Roots Holdings Ltd | Financial services | 2026 |
| Roots/Co. Ltd | Other services | 2022 |
| Roowala Ltd | Professional & scientific | 2024 |
| Ropar Transport Limited | Transport & logistics | 2023 |
| Ropergate Trustees Limited | Financial services | 1988 |
| Ropewalk Healthcare Ltd | Health & social care | 2013 |
| Roquefort Limited | Construction | 2022 |
| Rora Production UK Ltd | Wholesale & retail | 2024 |
| Roryal Recorveries Limited | Transport & logistics | 2026 |
| Rosa Education Ltd | Education | 2024 |
| Rosa Living Ltd | Real estate | 2026 |
| Roscacompany Ltd | Transport & logistics | 2015 |
| Roscoe Ellis Consulting Limited | Professional & scientific | 2023 |
| Rose & Crown Curry House Ltd | Hospitality | 2025 |
| Rose & Nancy Ltd | Wholesale & retail | 2021 |
| Rose Beauty Laser Limited | Wholesale & retail | 2013 |
| Rose Design (Leic) Ltd | Manufacturing | 2021 |
| Rose Education Provision Ltd | Education | 2025 |
| Rose George Properties Limited | Real estate | 2024 |
| Rose MAE Productions Ltd. | Information & communication | 2015 |
| Rose Midlands Ltd | Hospitality | 2025 |
| Rose Quartz Properties Ltd | Real estate | 2018 |
| Rose Residential Limited | Real estate | 2020 |
| Rose Training Ltd | Education | 2022 |
| Rose VEG Fruit Ltd | Wholesale & retail | 2021 |
| Rose-Brook AI Ltd | Information & communication | 2026 |
| Roseash Properties Ltd | Real estate | 2019 |
| Rosebay Estates Limited | Real estate | 2001 |
| Rosebery Health Ltd | Health & social care | 2015 |
| Rosebery Mot&Repair Ltd | Wholesale & retail | 2026 |
| Roseburn Hospitality Limited | Hospitality | 2025 |
| Rosedown Dingle Ltd | Wholesale & retail | 2024 |
| Roselea Property Ltd | Real estate | 2021 |
| Roselle Official Ltd | Wholesale & retail | 2026 |
| Rosemere Care Ltd | Health & social care | 2025 |
| Rosemina Ltd | Health & social care | 2023 |
| Rosemina's Outreach Project | Health & social care | 2013 |
| Rosemor International Limited | Manufacturing | 1985 |
| Rosemount Measurement Limited | Professional & scientific | 1934 |
| Rosemount Topco Limited | Professional & scientific | 2001 |
| Rosenrot Ltd | Administrative & support | 2021 |
| Rosepal Limited | Wholesale & retail | 2024 |
| ROSESTEELE7 Limited | Wholesale & retail | 2025 |
| Rosetree Apartments Management Company Limited | Extraterritorial | 2007 |
| Rosetta Lounge Harborne Ltd | Hospitality | 2024 |
| Rosevanion Ltd | Transport & logistics | 2015 |
| Rosewalt Ltd | Administrative & support | 2015 |
| Rosewood Assets Ltd | Real estate | 2018 |
| Rosewood Project Solutions Limited | Construction | 2020 |
| Rosey Fashion Ltd | Manufacturing | 2019 |