| RT Investments Lincoln Ltd | Real estate | 2024 |
| RTG Service Delivery Ltd | Information & communication | 2016 |
| RTO Limited | Construction | 2019 |
| RTP Design Ltd | Information & communication | 2014 |
| Rtsg Property Holdings Ltd | Financial services | 2018 |
| Rtsg Property Ltd | Construction | 2011 |
| Rubi Loncoln Ltd | Hospitality | 2024 |
| Rubia Tincto Investment Limited | Administrative & support | 2020 |
| Rublu Investments Limited | Real estate | 2019 |
| Rubyfred Ltd | Real estate | 2022 |
| Ruddocks 1884 Limited | Professional & scientific | 1940 |
| Ruddplumb Ltd | Construction | 2026 |
| Rudies Roots Nurseries Ltd | Wholesale & retail | 2022 |
| Ruff CUT Films Limited | Information & communication | 2015 |
| Rugged Drives Ltd | Manufacturing | 2012 |
| Running IMP International Sports Limited | Extraterritorial | 2007 |
| Running IMP Limited | Manufacturing | 1997 |
| Runwcl Ltd | Education | 2023 |
| Rupert Bourne Ltd | Health & social care | 2012 |
| Russell Oncology Ltd | Health & social care | 2013 |
| Russell Wiseman Limited | Health & social care | 2019 |
| Ruston Automotive Limited | Professional & scientific | 2018 |
| Ruston Sports and Social Club Limited | Other services | 2008 |
| Rute Accounting Ltd | Professional & scientific | 2020 |
| Ruth Gilbert Limited | Education | 2018 |
| Ruth Residential Properties Limited | Real estate | 2022 |
| Rutherford Civils & Groundworks Limited | Construction | 2015 |
| Rutherking Integrated Services Ltd | Construction | 2026 |
| Rutland Street (Filey) Management Company Limited | Hospitality | 2000 |
| Rutransport Ltd | Transport & logistics | 2023 |
| RVR Drive Ltd | Transport & logistics | 2026 |
| RVT Driver Training Limited | Administrative & support | 2026 |
| RW Glass Solutions Limited | Construction | 2022 |
| RW Services Boston Ltd | Construction | 2021 |
| RW Stokes Holdings Ltd | Financial services | 2023 |
| RW Urology Ltd | Health & social care | 2026 |
| RXF Light Limited | Transport & logistics | 2022 |
| RY Haulage Ltd | Transport & logistics | 2024 |
| Ryan BGD Ltd | Water & waste | 2026 |
| Ryan Leigh's Transport Ltd | Transport & logistics | 2012 |
| Ryan Rastall Golf Limited | Wholesale & retail | 2016 |
| Ryan’S Iron Ltd | Manufacturing | 2022 |
| Rybak Investments Ltd | Real estate | 2017 |
| Rybak Services Limited | Professional & scientific | 2011 |
| Ryland Decorators Limited | Construction | 2003 |
| S & C Letting and Developments Ltd | Real estate | 2020 |
| S & D Metcalfe Ltd | Financial services | 2019 |
| S & E Kelsey Properties Ltd | Real estate | 2018 |
| S & E Suma Holdings Ltd | Real estate | 2025 |
| S & H S Groundworks Ltd | Construction | 2022 |
| S & K Taverns Ltd | Hospitality | 2020 |
| S & N Forshaw Holdings Limited | Real estate | 2016 |
| S & P Garages Limited | Wholesale & retail | 2011 |
| S & R White Limited | Real estate | 2020 |
| S & T Landscapes Ltd | Administrative & support | 2025 |
| S a Jones Construction Ltd | Construction | 2022 |
| S and J (Lincs) Limited | Construction | 2022 |
| S B Roofing Lincoln Ltd | Construction | 2021 |
| S C Wilkinson Farms Limited | Agriculture & fishing | 2011 |
| S D H Haulage LLP | | 2017 |
| S Derbicz Holdings Ltd | Financial services | 2020 |
| S E Consultancy (Lincs) Ltd | Professional & scientific | 2024 |
| S E Properties (Lincoln) Limited | Real estate | 2022 |
| S I Controls Limited | Professional & scientific | 2012 |
| S J Arnold Ltd | Health & social care | 2018 |
| S J Driving Limited | Transport & logistics | 2025 |
| S J Howard (Lincoln) Ltd | Construction | 2017 |
| S J Jakes Building Services Limited | Construction | 2013 |
| S J MOT Centre Limited | Wholesale & retail | 2012 |
| S J Parkinson Transport of Lincoln Ltd | Transport & logistics | 2019 |
| S J Scaffolding Holdings Limited | Financial services | 2019 |
| S Mccarthy Marketing (East Midlands) Limited | Wholesale & retail | 2025 |
| S Mcgregor Transport Ltd | Transport & logistics | 2010 |
| S O Construction Lincoln Ltd | Construction | 2019 |
| S W Probate Services Ltd | Professional & scientific | 2012 |
| S&D Motors Ltd | Wholesale & retail | 2025 |
| S&M Transport Solutions Ltd | Transport & logistics | 2026 |
| S&W Technological Solutions Ltd | Manufacturing | 2024 |
| S. B.Haulage Services Ltd | Transport & logistics | 2020 |
| S. Hewis Plumbing and Heating Limited | Construction | 2018 |
| S. Lamyman & SON Limited | Agriculture & fishing | 2008 |
| S. Lyon & SON (Haulage) Limited | Transport & logistics | 1978 |
| S. Stott Engineering Limited | Professional & scientific | 1996 |
| S. W. Financial Services Limited | Financial services | 2000 |
| S.A Tech N Solutions Limited | Information & communication | 2025 |
| S.A. Done Limited | Transport & logistics | 2020 |
| S.B.Barker (Electrical and T.V) Limited | Construction | 1972 |
| S.G. Mountjoy Limited | Professional & scientific | 2005 |
| S.I Services Group Limited | Other services | 2016 |
| S.J.E. Engineering Limited | Manufacturing | 1990 |
| S.M.N.M Limited | Real estate | 2025 |
| S.N. Supplies Ltd | Wholesale & retail | 2010 |
| S.O.E (Lincoln) Ltd | Real estate | 2023 |
| S.V.Milnes & Sons Limited | Real estate | 1969 |
| SA Civil Engineering Ltd | Professional & scientific | 2025 |
| Sabre Medical Consultancy LLP | | 2009 |
| Sabz Jalali Limited | Health & social care | 2024 |
| SAC Boiler Plant Ltd | Administrative & support | 2009 |
| Sadeem Sky Ltd | Wholesale & retail | 2025 |
| Sadler Road Management Company Limited | Households | 2012 |