| Robinson Clark Electrical Contractors Ltd | Construction | 2023 |
| Robinsons Hair Collective Ltd | Education | 2023 |
| Robj Trans Ltd | Transport & logistics | 2016 |
| Robotic Feeding Systems Ltd | Manufacturing | 2023 |
| Robotic Systems Limited | Professional & scientific | 2020 |
| Robson Reid Limited | Professional & scientific | 2025 |
| Robwin Ltd | Information & communication | 2024 |
| Robyn Transport Ltd | Transport & logistics | 2024 |
| Rock Retro Ltd | Wholesale & retail | 2022 |
| Rocket Creative Design Limited | Administrative & support | 2006 |
| Rocket Uniforms 1 Limited | Wholesale & retail | 2025 |
| Rocket Uniforms 2 Limited | Wholesale & retail | 2025 |
| Rocket Uniforms 3 Limited | Wholesale & retail | 2025 |
| Rocket Uniforms Group Limited | Wholesale & retail | 2025 |
| Rockford Trading Company Limited | Manufacturing | 1996 |
| Rocktide Properties Limited | Administrative & support | 2005 |
| Rockyfella Graphics Media Ltd | Information & communication | 2025 |
| ROD Corp Ltd | Administrative & support | 2024 |
| Rodam Limited | Health & social care | 2020 |
| Rodd Design Limited | Professional & scientific | 2007 |
| Roedeer Developments Limited | Construction | 2025 |
| Roger a Hall Construction Services Limited | Construction | 2010 |
| Roger Davis Interiors Limited | Wholesale & retail | 1993 |
| Roger Leighton Homes Limited | Construction | 2009 |
| Roger Windley Limited | Administrative & support | 2009 |
| Rogue State Studio Ltd | Wholesale & retail | 2025 |
| Rohan Health Limited | Administrative & support | 2013 |
| Rohue Ltd | Real estate | 2023 |
| ROK Construction and Hire Limited | Construction | 2015 |
| Rokit Digital Ltd | Administrative & support | 2019 |
| Rolan Bridge Properties Limited | Real estate | 2014 |
| Rolandwind Ltd | Transport & logistics | 2020 |
| Rollpoint Limited | Administrative & support | 2005 |
| Roman Gate Management Company Limited | Households | 2018 |
| Romas Lincoln Ltd | Wholesale & retail | 2018 |
| Romeo Consultants Ltd | Financial services | 2025 |
| Romeos Square Specials Limited | Hospitality | 2019 |
| Rontree Wilson Homes Ltd | Real estate | 2025 |
| Roofriendly Limited | Construction | 2003 |
| Rook Medical Services Ltd | Health & social care | 2024 |
| Rooke & Co Accountants Limited | Professional & scientific | 2003 |
| Room Media Ltd | Information & communication | 2026 |
| Room Twelve Ltd | Administrative & support | 2014 |
| Root Extracts Limited | Professional & scientific | 2022 |
| Root Solutions Ltd | Wholesale & retail | 2024 |
| Root Studio Design Limited | Professional & scientific | 2014 |
| Rooted Arts CIC | Education | 2024 |
| Ropafric Limited | Professional & scientific | 2025 |
| Roper Group Holdings Ltd | Financial services | 2026 |
| Rosavina Trading Limited | Wholesale & retail | 2025 |
| Rose and Linen Limited | Wholesale & retail | 2014 |
| Rose Community Group CIC | Other services | 2025 |
| Rose Construction (Lincoln) Ltd | Construction | 2018 |
| Rose Nail & Beauty Lounge Ltd | Other services | 2024 |
| Rosedale Services Ltd | Manufacturing | 2024 |
| Rosewood Architectural Design Studio Ltd | Professional & scientific | 2020 |
| Roshko Medical Services Ltd | Health & social care | 2018 |
| Rosie and Trevor Elvin Limited | Professional & scientific | 2018 |
| Rosiek Ltd | Professional & scientific | 2017 |
| Ross Construction Ltd | Construction | 2019 |
| Rossington Wealth Management Ltd | Financial services | 2016 |
| Rotg Ltd | Wholesale & retail | 2024 |
| Rotson Shop Ltd | Wholesale & retail | 2022 |
| Round Tower Limited | Real estate | 2021 |
| Route 14 Ltd | Hospitality | 2014 |
| Route 3 Enterprises Ltd | Wholesale & retail | 2003 |
| Route 4 Cars Limited | Wholesale & retail | 2021 |
| Roverfield Limited | Agriculture & fishing | 2025 |
| Rovers Return Pet Shop Limited | Wholesale & retail | 2012 |
| Rowan Farm Ltd | Agriculture & fishing | 2021 |
| Rowding Ltd | Construction | 2025 |
| Rowell Air Conditioning Limited | Construction | 2016 |
| ROY Ward (Farms) Limited | Agriculture & fishing | 1973 |
| Royal Oak (Aubourn) Limited | Hospitality | 2013 |
| Royale Stones Limited | Construction | 2012 |
| Royd Toolgroup UK Limited | Administrative & support | 2016 |
| Royl Barber Ltd | Other services | 2025 |
| RP New Homes Ltd | Real estate | 2025 |
| RP Wright Leisure Ltd | Hospitality | 2018 |
| RPC Scarborough Limited | Construction | 2022 |
| RPE Roofing Ltd | Construction | 2024 |
| RPH Property Limited | Real estate | 2010 |
| RPL HDD Services Limited | Construction | 2024 |
| RPR Inn’S Ltd | Hospitality | 2026 |
| RR Global Executive Limited | Administrative & support | 2018 |
| Rrpl Employee Trustee Ltd | Administrative & support | 2026 |
| RS London Fried Chicken Ltd | Hospitality | 2023 |
| RSB Advisory Ltd | Professional & scientific | 2024 |
| Rsdr Limited | Construction | 2022 |
| RSJ Steels (Lincoln) Limited | Construction | 1978 |
| RSL Haulage Ltd | Transport & logistics | 2022 |
| RSL Lealand Ltd | Real estate | 2020 |
| RSM AV Limited | Transport & logistics | 2024 |
| RSM ENT Limited | Health & social care | 2014 |
| RSM Hold Co Ltd | Financial services | 2024 |
| RSM Maintenance Ltd | Agriculture & fishing | 2013 |
| RSP Lincoln Ltd | Construction | 2017 |
| RSR Health Limited | Health & social care | 2015 |
| Rssm Ltd | Construction | 2022 |
| RST Construction Ltd | Construction | 2012 |