| Rosekel Holdings Limited | Financial services | 2022 |
| Rosekel Resourcing Ltd | Health & social care | 2010 |
| Roseli Limited | Real estate | 2019 |
| Rosemary Property Limited | Administrative & support | 2007 |
| Rosemond Paralegal Limited | Professional & scientific | 2026 |
| Rosen Haven Limited | Real estate | 2026 |
| Rosewood Carpentry Solutions Ltd | Manufacturing | 2020 |
| Rosewood Management Kirkby Limited | Households | 2011 |
| Rosewood Partners LLP | | 2012 |
| Roshan Investments (UK) Ltd | Real estate | 2009 |
| Roshan Marcom Limited | Wholesale & retail | 2025 |
| Roshani Limited | Health & social care | 2019 |
| Roshield Ltd | Health & social care | 2016 |
| Rosie Loves Cocoa Ltd | Manufacturing | 2026 |
| Ross Eden Ltd | Professional & scientific | 2019 |
| Ross Farm Machinery Limited | Wholesale & retail | 1978 |
| Ross Laird Limited | Professional & scientific | 2002 |
| Rossell Electrical Ltd | Construction | 2017 |
| Rosselli Services Limited | Professional & scientific | 2008 |
| Rossi Clothing Company Limited | Wholesale & retail | 2011 |
| Rossi Vintage Ltd | Wholesale & retail | 2025 |
| Rossi's Developments Limited | Construction | 1998 |
| Rossi's Investments Limited | Real estate | 2025 |
| Rostia Consulting Limited | Professional & scientific | 2007 |
| Rostock Limited | Hospitality | 2006 |
| Rostreet Limited | Transport & logistics | 2021 |
| Rotajet Maintenance Service Ltd | Households | 2021 |
| Rotate Trading Ltd | Wholesale & retail | 2025 |
| Rotbol Ventures Ltd | Administrative & support | 2017 |
| Rotex Technologies Ltd | Professional & scientific | 2024 |
| Rother Valley Properties Ltd | Real estate | 2019 |
| Rothera Bray LLP | | 2022 |
| Rotheras (Nottingham) Limited | Professional & scientific | 2001 |
| Rotherham V.E. Limited | Other services | 1996 |
| Rotherhams 1750 Limited | Manufacturing | 2014 |
| Rotherhams Watches Limited | Manufacturing | 2014 |
| Rothwell Kitchens Ltd | Wholesale & retail | 2020 |
| Rothwell Resourcing Ltd | Administrative & support | 2020 |
| Rotten Limited | Hospitality | 2002 |
| Rouge RR Ltd | Other services | 2023 |
| Rough Around the Hedges Ltd | Administrative & support | 2025 |
| Rough Boys Limited | Information & communication | 2024 |
| Rough Close Day Nursery Limited | Health & social care | 2023 |
| Rough Company Limited | Extraterritorial | 2004 |
| Rough Trade Retail (UK) Limited | Wholesale & retail | 2006 |
| Rough Trade Retail Holdings Limited | Financial services | 2018 |
| Roumine Limited | Extraterritorial | 2011 |
| Roundsquare Solutions Consultancy Limited | Education | 2016 |
| Roundsquare Solutions Leadership Limited | Professional & scientific | 2018 |
| Roundsquare Solutions Limited | Education | 2021 |
| Roundsquare Solutions Training Limited | Education | 2024 |
| Roundworks IT Ltd | Information & communication | 2016 |
| Rouse Builders & Plumbers Limited | Construction | 2003 |
| Rout 1 Limited | Manufacturing | 2007 |
| Route 999 Medical Services Ltd | Health & social care | 2023 |
| ROUTE4 Logistics Ltd | Transport & logistics | 2017 |
| ROUTE4 Resource Solutions Limited | Administrative & support | 2016 |
| ROUTE4 Solutions Limited | Administrative & support | 2014 |
| ROUTE4 Training Solutions Limited | Administrative & support | 2019 |
| ROUTE99 Ltd | Wholesale & retail | 2025 |
| Routen Chaplin Holdings Limited | Financial services | 2020 |
| Routen Chaplin Limited | Financial services | 2008 |
| Rovan Developments Limited | Real estate | 2025 |
| Rovers & Moffat Ltd | Professional & scientific | 2015 |
| ROW Holdings Limited | Financial services | 2022 |
| Rowa Dream Limited | Information & communication | 2025 |
| Rowan Cozens Music Limited | Arts & recreation | 2013 |
| Rowanvale Trained Dogs Ltd | Agriculture & fishing | 2020 |
| Rowe Cleaning Ltd | Administrative & support | 2018 |
| Rowe Construction Management Ltd. | Construction | 2016 |
| Rowe Real Estates Ltd | Real estate | 2025 |
| Rowing Unlimited Limited | Financial services | 2005 |
| Rowland & Wyllie Plastering Limited | Construction | 2007 |
| Rowland Finance Ltd | Financial services | 2022 |
| Rowland Mortgages Ltd | Financial services | 2020 |
| Rowles Orthopaedics Ltd | Health & social care | 2025 |
| Rowley and Rowley Limited | Construction | 2014 |
| Rowlson Industrial Sewing Engineers Limited | Wholesale & retail | 1977 |
| Rowlson Plumbing and Heating Services Limited | Construction | 2014 |
| Rowntree Equine Therapy CIC | Other services | 2024 |
| Roxana Carlapoi Ltd | Administrative & support | 2024 |
| Roxanne Construction Ltd | Construction | 2025 |
| Roxs Events Ltd | Arts & recreation | 2026 |
| Roxx Capital Limited | Construction | 2019 |
| Roxx Group Holdings Limited | Financial services | 2019 |
| Roxy Care Group Ltd | Health & social care | 2022 |
| ROY Cake Investments Limited | Construction | 2021 |
| ROY Geddes Bricks Limited | Wholesale & retail | 1990 |
| ROY Quinton Funeral Directors Ltd | Extraterritorial | 2003 |
| Roya Global Ltd | Real estate | 2025 |
| Roya Hair Limited | Wholesale & retail | 2024 |
| Royal Diadem Care Limited | Other services | 2019 |
| Royal Gate Apartments Management Limited | Households | 2010 |
| Royal Oak GAS Heating Services Ltd | Construction | 2021 |
| Royal Parks Lofts Management Company (Number Two) Limited | Households | 2002 |
| Royale Graphics Holdings Limited | Financial services | 2018 |
| Royale MAK Ltd | Wholesale & retail | 2025 |
| Royall Pizza & BBQ Ltd | Hospitality | 2022 |
| Roycelets LLP | | 2020 |
| Royel Piri Piri Ltd | Hospitality | 2026 |