| Rajan Medical Services Ltd | Health & social care | 2012 |
| Rajarshi Retail Ltd | Wholesale & retail | 2024 |
| RAK Projects Ltd | Administrative & support | 2013 |
| Rakow Czestochowa Ltd | Transport & logistics | 2017 |
| Ralhope Limited | Extraterritorial | 2022 |
| Ralph Godley Ltd | Professional & scientific | 2011 |
| Ramans Transport Ltd | Transport & logistics | 2018 |
| Ramen Property Ltd | Real estate | 2016 |
| Rand Events Limited | Arts & recreation | 2023 |
| Rand Farm Park Day Nursery Ltd | Health & social care | 2018 |
| Randall Builders Limited | Construction | 2007 |
| Ranshaw Holdings Limited | Construction | 2022 |
| RAP Building Services Ltd | Professional & scientific | 2021 |
| Rapacci Solutions Ltd | Transport & logistics | 2021 |
| Rapid Consulting Engineers Limited | Professional & scientific | 2013 |
| Raptop Limited | Wholesale & retail | 2024 |
| Raptor Consolidated Limited | Financial services | 2021 |
| Raptor Services (Lincoln) Limited | Transport & logistics | 2018 |
| Rapture Venues Limited | Real estate | 2004 |
| RAT PAK Engineering Limited | Manufacturing | 1997 |
| RAT PAK Pest Control Products Ltd | Wholesale & retail | 2025 |
| Ratan Urology Ltd | Health & social care | 2019 |
| Raven Dynamics Ltd. | Manufacturing | 2022 |
| Ravendale Financial Planning Limited | Financial services | 2026 |
| Ravenscroft Properties Ltd | Construction | 2021 |
| Ravi Rajani Limited | Professional & scientific | 2018 |
| RAW Facilities Management Ltd | Administrative & support | 2025 |
| RAW Hair Supplies Ltd | Wholesale & retail | 2020 |
| Rawding & SON Limited | Real estate | 2020 |
| RAY Law Motor Engineers Ltd | Wholesale & retail | 2003 |
| RAY of Light Letters Ltd | Manufacturing | 2024 |
| Rayglobal Ltd | Wholesale & retail | 2026 |
| Rayval Catering Services Ltd | Hospitality | 2025 |
| Rayward Comprehensive Coaching and Training Services Ltd | Education | 2026 |
| Razarian Enterprises Ltd | Hospitality | 2024 |
| RB Construction Training Limited | Education | 2025 |
| RB Fitness Ltd | Arts & recreation | 2026 |
| RBA Brothers Ltd | Transport & logistics | 2018 |
| Rbthermal Ltd | Manufacturing | 2025 |
| Rbytes IT Services Limited | Information & communication | 2022 |
| RC Developments Reynolds Costin Limited | Construction | 2016 |
| RC Management Consulting Limited | Professional & scientific | 2026 |
| RC Media Services Limited | Information & communication | 2009 |
| RC Traction Ltd | Transport & logistics | 2025 |
| RCM Dallington Limited | Real estate | 2020 |
| RCR Topco Ltd | Financial services | 2023 |
| RD & JM Coles Investments Limited | Financial services | 2020 |
| RD & JM Coles Property Management Limited | Real estate | 2011 |
| RD HGV Services Ltd | Transport & logistics | 2026 |
| RD Motorcycles Limited | Wholesale & retail | 2018 |
| RD Scaffolding Services Ltd | Construction | 2023 |
| RDL Tech Solutions Ltd | Information & communication | 2025 |
| RDS Transport Solutions Limited | Transport & logistics | 2023 |
| RDX Accountancy Services Limited | Professional & scientific | 2025 |
| Reactfast Plumbing and Heating Ltd | Construction | 2012 |
| Read Homes & Development Ltd | Real estate | 2025 |
| Ready Ride Cars Ltd | Transport & logistics | 2025 |
| Real Barber Lincoln Ltd | Other services | 2022 |
| Real Life Living Things Ltd | Professional & scientific | 2016 |
| Real Little Gems Limited | Wholesale & retail | 2013 |
| Real Medics Limited | Health & social care | 2024 |
| Real Readme Limited | Information & communication | 2016 |
| Realistic Safety Solutions Ltd | Professional & scientific | 2012 |
| Reashu Trading Ltd | Wholesale & retail | 2025 |
| Rebecca Roberts Ltd | Professional & scientific | 2026 |
| Rebecca Sidsaph Ltd | Health & social care | 2022 |
| Rebrook Limited | Construction | 1987 |
| Rebus Control Systems Limited | Manufacturing | 1995 |
| Recon Survey & Safety Ltd | Wholesale & retail | 2018 |
| Recoupiq Ltd | Information & communication | 2026 |
| Recovery Coach Academy Ltd | Education | 2021 |
| Rectors Gate Retford Management Company Limited | Households | 2016 |
| Recuvr. Ltd | Administrative & support | 2026 |
| Recycled Crop Nutrients Limited | Agriculture & fishing | 2020 |
| Red Associates & Partners Limited | Administrative & support | 2018 |
| Red Candle Limited | Information & communication | 2006 |
| Red Carpet Events Ltd | Arts & recreation | 2020 |
| Red Carpet Ready Events Ltd | Arts & recreation | 2020 |
| Red Carpet Ready Limited | Wholesale & retail | 2013 |
| Red DOT Ventures Limited | Financial services | 2026 |
| Red Dust UK Ltd | Administrative & support | 2009 |
| Red Hair & Beauty Limited | Other services | 2008 |
| Red Horse Fitness Limited | Arts & recreation | 2018 |
| Red House Farm Fishing Holidays Limited | Hospitality | 2025 |
| Red Kite Property Development Ltd | Construction | 2023 |
| Red Lantern Happy House Ltd | Hospitality | 2023 |
| Red Line Building Supplies & Services Ltd | Construction | 2011 |
| Red Maple Ltd | Other services | 2003 |
| Red Recruitment 24/7 Limited | Administrative & support | 2006 |
| Red Reporting Agency Limited | Health & social care | 2017 |
| Red Rock Partnership Ltd | Administrative & support | 2009 |
| Red Roof Clinic Ltd | Health & social care | 2026 |
| Red Room Reading Ltd | Information & communication | 2019 |
| Red Rose Pavements Limited | Construction | 1985 |
| Red Shark Design Ltd | Professional & scientific | 2023 |
| Red Spot Limited | Information & communication | 2004 |
| Red Tape KIT Limited | Information & communication | 2025 |
| Redbox PAY Ltd | Professional & scientific | 2018 |
| Reddata Management Limited | Information & communication | 2016 |
| Redeemer Rock Ltd | Real estate | 2023 |