| Richard Bussell Ltd | Administrative & support | 2011 |
| Richard Dixon Commercials Limited | Wholesale & retail | 2013 |
| Richard Grove Limited | Construction | 2013 |
| Richard Overton Ltd | Extraterritorial | 2000 |
| Richard Palmer Limited | Professional & scientific | 2022 |
| Richard Smith Drivers Limited | Transport & logistics | 2007 |
| Richard Townend Ltd | Construction | 2012 |
| Richards of England Limited | Wholesale & retail | 2014 |
| Richardson Electronics Limited | Wholesale & retail | 1981 |
| Richardson Industrial Services Limited | Manufacturing | 2023 |
| Richardsons Car Sales Limited | Wholesale & retail | 2017 |
| Richer Learning Ltd | Education | 2019 |
| Richmond Court Management Company (Gainsborough) Limited | Households | 1990 |
| Richmond Electrical Solutions Limited | Construction | 2025 |
| Richmond View Ltd | Construction | 1986 |
| Richmount Properties Limited | Real estate | 2002 |
| Ricky Bhogal Ltd | Health & social care | 2022 |
| Ridge View Heights Management Co Ltd | Real estate | 2022 |
| Ridgeway (& Co.) Ltd | Administrative & support | 2018 |
| Ridgeway College Limited | Education | 2025 |
| Ridgeway Roof Care Ltd | Construction | 2025 |
| Ridgeways Asset Management Ltd | Real estate | 2022 |
| Ridgid Partshop Limited | Wholesale & retail | 2015 |
| Ridgid Toolshop Limited | Manufacturing | 2017 |
| Rieju UK Ltd | Wholesale & retail | 2007 |
| Riley Property Developments (Lincoln) Limited | Real estate | 2024 |
| Rilmac Fabrication Limited | Construction | 1968 |
| Rilmac Holdings Limited | Professional & scientific | 1957 |
| Rilmac Insulation Limited | Construction | 1971 |
| Rilmac Limited | Extraterritorial | 1944 |
| Rilmac Scaffold Hire Limited | Construction | 2006 |
| Rilmac Scaffolding Limited | Construction | 1990 |
| Rinaldi Furniture Limited | Construction | 2017 |
| RIO Rodeo Limited | Other services | 2025 |
| Rise and Shine Rentals Ltd | Households | 2019 |
| Risecrest Group Ltd | Public administration | 2026 |
| Riseholme Park Farms Ltd | Education | 1993 |
| Riseholme Properties Limited | Real estate | 2015 |
| Risian Retreats Ltd | Hospitality | 2021 |
| Rissington Property Limited | Construction | 2014 |
| Ritchie & Co Technical Services Ltd | Professional & scientific | 2023 |
| Riva Construction Limited | Construction | 1987 |
| Riverhead Coffee Limited | Hospitality | 2021 |
| Riverland Homes Limited | Construction | 2026 |
| Riverlodge Limited | Households | 2011 |
| Riverport Business Services Ltd | Professional & scientific | 2024 |
| Riverside Enterprise Park Management Company Limited | Real estate | 2016 |
| Riverside Lawns Resident Management Company Limited | Real estate | 2007 |
| Rivm Plumbing and Heating Limited | Construction | 2017 |
| RJ Cleaning Lincoln Ltd | Administrative & support | 2021 |
| RJ Coupland Limited | Construction | 2003 |
| RJ Juniors Ltd | Hospitality | 2025 |
| RJ Projects Limited | Construction | 2015 |
| RJB Engineering (1980) Ltd | Manufacturing | 2016 |
| RJB Venture Ltd | Real estate | 2024 |
| RJM (Joinery) Limited | Manufacturing | 2007 |
| Rjpb Holdings Limited | Financial services | 2025 |
| Rjpb Trading Limited | Real estate | 2025 |
| RK and JS Stothard Limited | Construction | 2003 |
| RLB Therapy Ltd | Health & social care | 2021 |
| RLG. Plumbing & Heating Ltd | Construction | 2011 |
| RM Bespoke Homes Limited | Construction | 2020 |
| RM Building Services (Lincoln) Limited | Construction | 2018 |
| RM Joinery (Lincoln) Limited | Manufacturing | 2020 |
| Rmad Properties Ltd | Real estate | 2025 |
| RMG Cyber Consulting Ltd | Information & communication | 2021 |
| RMO Contractors Ltd | Financial services | 2008 |
| RMO Developments Limited | Real estate | 2026 |
| RMO Joinery Limited | Manufacturing | 2025 |
| RMP Coatings (Lincoln) Ltd | Wholesale & retail | 2023 |
| RMR Falconry Supplies Ltd | Manufacturing | 2019 |
| RMS Clothing & Supplies Ltd | Wholesale & retail | 2025 |
| RMS Grantham Holdings Limited | Financial services | 2023 |
| RMS Grantham Limited | Construction | 2015 |
| RO and SU Medical Services Limited | Health & social care | 2015 |
| Ro-Pro Ltd | Manufacturing | 2022 |
| Road & Competition Engineering (Lincoln) Limited | Wholesale & retail | 2023 |
| Roam Planning Ltd | Professional & scientific | 2025 |
| Roar Data Ltd | Information & communication | 2015 |
| Roar Data Technologies Ltd | Information & communication | 2002 |
| Roarminerals Limited | Wholesale & retail | 2025 |
| ROB Bradley Building Design Ltd | Professional & scientific | 2015 |
| ROB Morris Transport (Midlands) Ltd | Transport & logistics | 2014 |
| Robandro Ltd | Health & social care | 2019 |
| Robbie Plumbing and Heating Limited | Construction | 2026 |
| Robert D Pearson Ltd | Professional & scientific | 2021 |
| Robert LEE Ford Limited | Extraterritorial | 2024 |
| Robert Meadows Plumbing&Heating Ltd | Construction | 2017 |
| Robert Nelstrop Farms Limited | Agriculture & fishing | 1999 |
| Robert Smith Management Limited | Financial services | 2010 |
| Robert VOS International Limited | Administrative & support | 2023 |
| Robert Wilcox Transport Limited | Transport & logistics | 2023 |
| Robertshaw Bulk Transport Ltd | Other services | 2022 |
| Robertsons Accountancy Limited | Professional & scientific | 2021 |
| Robes N Rails Limited | Wholesale & retail | 1995 |
| Robey Court (Lincoln) Management Company Limited | Households | 2012 |
| Robey Estates Ltd | Administrative & support | 2025 |
| Robin C LEE Limited | Professional & scientific | 2025 |
| Robin Rose Bakes Ltd | Manufacturing | 2022 |
| Robinson & Harris Ltd | Construction | 2014 |