| ROD Lockett Motor Repairs Limited | Manufacturing | 2005 |
| ROD Strickland Design Limited | Other services | 2016 |
| Rodale Commercials Ltd | Wholesale & retail | 2019 |
| Rodale Holdings Ltd | Financial services | 2017 |
| Rodale Ltd | Administrative & support | 2023 |
| Rodgers Leask Limited | Professional & scientific | 1989 |
| ROE Farm Hardware Limited | Wholesale & retail | 2026 |
| ROE Farm Retail Ltd | Wholesale & retail | 2020 |
| Roets Helicopter Services Ltd | Transport & logistics | 2025 |
| Rofotec Limited | Construction | 1998 |
| Roger Bedson Limited | Financial services | 2012 |
| Rogers & Co Tree Services Ltd | Administrative & support | 2025 |
| Rohini Holdings Limited | Real estate | 2023 |
| Rohnaz Builders Ltd | Construction | 2025 |
| ROJ Clinic Ltd | Health & social care | 2025 |
| ROK Holdings Limited | Professional & scientific | 2016 |
| Role Resolve Psychotherapy Ltd. | Health & social care | 2024 |
| Role Resolve Therapy CIC | Health & social care | 2024 |
| Roll With US C.I.C. | Health & social care | 2024 |
| Roller 33 Limited | Construction | 2023 |
| Rollersnakes Limited | Wholesale & retail | 1988 |
| Rollersnakes Trustees Limited | Financial services | 2024 |
| Rollin Transport Training Ltd | Education | 2024 |
| Rolling Consultancy Ltd | Professional & scientific | 2025 |
| Rolling F and B Ltd | Hospitality | 2017 |
| Rolling Smoke Derby Ltd | Hospitality | 2026 |
| Rolling Smoke Midlands Limited | Hospitality | 2024 |
| Rollpay Bureau Limited | Professional & scientific | 2012 |
| Rolls-Royce Retirement Savings Trust Limited | Financial services | 2017 |
| Rolls-Royce SMR Limited | Professional & scientific | 2020 |
| Rolls-Royce Solutions UK Limited | Manufacturing | 2003 |
| Rolls-Royce Submarines Limited | Manufacturing | 1959 |
| Rolls-Royce UK Pension Fund Trustees Limited | Financial services | 2008 |
| Roma Education IS Key C.I.C. | Professional & scientific | 2025 |
| Roman Fields (Corbridge) Management Company Limited | Households | 2020 |
| Roman&Co Limited | Hospitality | 2025 |
| Romans Crossing Management Company Limited | Households | 2014 |
| Romar Holdings Limited | Information & communication | 2025 |
| Romeoproperties Ltd | Construction | 2013 |
| RON Bennett Road Services Ltd | Transport & logistics | 2020 |
| RON Grundy (Melbourne) Limited | Wholesale & retail | 1965 |
| RON Grundy Developments Limited | Construction | 2024 |
| RON Grundy Holdings Limited | Financial services | 2016 |
| Ronin Specialist Consultancy Limited | Transport & logistics | 2005 |
| Ronnie Construction Services Ltd | Construction | 2021 |
| Ronnies Limited | Hospitality | 2008 |
| Roodee Properties Ltd | Real estate | 2024 |
| Rook Leadership Ltd | Professional & scientific | 2026 |
| Room Harmony Ltd | Real estate | 2025 |
| Room Life Limited | Hospitality | 2014 |
| Roome-Hanson Styling Limited | Hospitality | 2021 |
| Roopjatt Construction Limited | Construction | 2016 |
| Root Analysis Ltd | Professional & scientific | 2023 |
| Root Proxies Ltd | Information & communication | 2026 |
| Rooted Properties Limited | Real estate | 2021 |
| Rooted Woodland Ltd | Agriculture & fishing | 2026 |
| Roots Design and Build Limited | Construction | 2016 |
| Roquex Ltd | Professional & scientific | 2025 |
| Rorias Limited | Wholesale & retail | 2026 |
| Rose & Berry Relocation Homes Ltd | Real estate | 2019 |
| Rose & Birkinshaw Ltd | Real estate | 2025 |
| Rose (Eco) Ltd | Agriculture & fishing | 2021 |
| Rose (Essex) Holdings Limited | Financial services | 2025 |
| Rose and Storm Limited | Arts & recreation | 2022 |
| Rose Hill Joy Ltd | Administrative & support | 2025 |
| Rose Meadow Homes Ltd | Real estate | 2025 |
| Rose Mount Supported Living Ltd | Health & social care | 2014 |
| Rose Nails Limited | Other services | 2015 |
| Rose of Bengal Ltd | Hospitality | 2016 |
| Rose of Sharon Care Solutions Ltd | Health & social care | 2025 |
| Rose of Winds Ltd | Construction | 2023 |
| Rose SPP Limited | Manufacturing | 2000 |
| Rose Taigh Limited | Professional & scientific | 2023 |
| Rosebudd Design Consultancy Ltd | Wholesale & retail | 1993 |
| Rosedale Stores Limited | Wholesale & retail | 2023 |
| Rosedene View Management Company Limited | Households | 2003 |
| Rosehill Auto Test Centre Limited | Wholesale & retail | 2013 |
| Rosehill Day Nursery EYC Limited | Health & social care | 2024 |
| Rosehill Motors Ltd | Wholesale & retail | 2026 |
| Rosehill Pharmacy Ltd | Health & social care | 2010 |
| Rosell Ltd | Financial services | 2025 |
| Roselune Ltd | Wholesale & retail | 2025 |
| Rosenbridge Ltd | Information & communication | 2019 |
| Roseneath Investment Ltd | Financial services | 2025 |
| Roses by AM Ltd | Wholesale & retail | 2026 |
| Roses by Carter Limited | Wholesale & retail | 2016 |
| Rosetin Healthcare Ltd | Health & social care | 2025 |
| Rosewood (Eco) Ltd | Agriculture & fishing | 2021 |
| Rosh Real Estate Ltd | Real estate | 2024 |
| Roshini Limited | Manufacturing | 2025 |
| Rosie's Events Ltd | Hospitality | 2025 |
| Rosmead Healthcare Ltd | Health & social care | 2018 |
| Ross & Forsyth Consultancy Limited | Health & social care | 2025 |
| Ross Birks Plumbing and Heating Limited | Construction | 2020 |
| Rosy Llama Ltd | Wholesale & retail | 2018 |
| Rosy Rooms Ltd | Real estate | 2022 |
| ROT Logistics Ltd | Transport & logistics | 2025 |
| Rotherwood Roofing Limited | Construction | 2016 |
| Round DIG Ltd | Construction | 2024 |
| Roundhouse Key Solutions Ltd | Administrative & support | 2010 |