| Primrose Hollow (Louth) Limited | Households | 2018 |
| Print and Away Ltd | Wholesale & retail | 2026 |
| Printer's Place Limited | Households | 2014 |
| Privileged Software Ltd | Information & communication | 2009 |
| Professional Technical Consulting Limited | Professional & scientific | 2011 |
| Progressio Group Ltd. | Real estate | 2020 |
| Project 83 Ltd | Construction | 2019 |
| Project Controls Consultancy Services Ltd | Professional & scientific | 2025 |
| Project Wealth Group Ltd. | Education | 2018 |
| PROTECK9 Ltd | Other services | 2025 |
| Protecthear Ltd | Manufacturing | 2014 |
| PSB Trading Ltd | Wholesale & retail | 2020 |
| Psychologylincs Ltd | Education | 2023 |
| PTR Racing Limited | Arts & recreation | 2018 |
| Pulverlux Limited | Professional & scientific | 1980 |
| Q Polymers Limited | Professional & scientific | 1988 |
| Quadmedica Limited | Hospitality | 2018 |
| Quartz Glazing Limited | Construction | 2017 |
| Qudos Homes Ltd | Construction | 2014 |
| Queens Park Flats Limited | Households | 1989 |
| R & a Needham Farms Limited | Agriculture & fishing | 1982 |
| R a D Unsworth Farms Limited | Real estate | 1986 |
| R and Y Autos Limited | Wholesale & retail | 2002 |
| R Canter Elite Limited | Arts & recreation | 2019 |
| R Canter Limited | Agriculture & fishing | 2015 |
| R M Dungworth Farms | Agriculture & fishing | 2011 |
| Race & Retro Cars Limited | Wholesale & retail | 2025 |
| Radcom Radiotelephone Services Limited | Manufacturing | 1982 |
| Rapid Resolutions Ltd | Information & communication | 1999 |
| Rawcode Computer Consultancy Limited | Information & communication | 2006 |
| RAY & SUE Ltd | Hospitality | 2020 |
| Rdcm Ltd | Professional & scientific | 2022 |
| Re-Invention Hair Co. Limited | Other services | 2014 |
| Realty Roots Ltd | Real estate | 2025 |
| Reaper Holdings Limited | Professional & scientific | 2017 |
| Reay Equestrian Ltd | Agriculture & fishing | 2018 |
| Reddingwood Electronics Limited | Manufacturing | 2003 |
| Redmorello Ltd | Information & communication | 2010 |
| Redseaton Limited | Extraterritorial | 2013 |
| Regency Sales UK Ltd | Wholesale & retail | 2018 |
| Regionalheroes.Com Limited | Administrative & support | 2003 |
| REPM3 Lighting Systems Ltd | Manufacturing | 2025 |
| RES (Lincs) Ltd | Manufacturing | 2023 |
| Rescue Refrigeration Limited | Construction | 2002 |
| Resolution Clubs Ltd | Hospitality | 2012 |
| Responsible Sourcing Scheme Ltd | Other services | 2022 |
| Reva Beauty Limited | Other services | 2024 |
| Revelations (Lincs) Limited | Construction | 2015 |
| Revolution Wraps Limited | Wholesale & retail | 2013 |
| RH Property Investments (Lincs) Limited | Real estate | 2022 |
| Rhubarbara Limited | Arts & recreation | 2004 |
| Rich Trees GM Ltd | Administrative & support | 2025 |
| Richard Jones Associates Limited | Professional & scientific | 2018 |
| Riddel Holdings Limited | Financial services | 2025 |
| Riddel Investment Group Limited | Financial services | 2025 |
| Riley Bar and Restaurant Ltd | Hospitality | 2015 |
| Rinkway Management Company (Swadlincote) Limited | Administrative & support | 1991 |
| Riverbank Maintenance Ltd | Households | 2018 |
| Riverside Court (Louth) Management Company Limited | Households | 2015 |
| RJ Design Architecture Ltd | Professional & scientific | 2008 |
| RJN Farming Limited | Agriculture & fishing | 2005 |
| RLM Rentals Limited | Real estate | 2024 |
| Roberts Corporate Associates Limited | Professional & scientific | 2012 |
| Roci Construction Services Ltd | Construction | 2024 |
| Rodden and Cooper Limited | Manufacturing | 2003 |
| Rook Analytics Ltd | Professional & scientific | 2016 |
| Rookery Farm (Somercotes) Limited | Construction | 1997 |
| ROOT2 Recruitment Limited | Administrative & support | 2012 |
| Roro Property Management Ltd | Real estate | 2018 |
| Rosebud Interiors Ltd | Professional & scientific | 2020 |
| Rosemary Healthcare Ltd | Health & social care | 2013 |
| Ross Mackay Developments Limited | Construction | 2000 |
| Royale Repoint Ltd | Construction | 2025 |
| RPS Developments (Lincolnshire) Ltd | Construction | 2019 |
| RRR Rentals ( Lincs ) Ltd | Professional & scientific | 2008 |
| RS and Sons (Machinery) Limited | Wholesale & retail | 2019 |
| Rubine Creative Limited | Professional & scientific | 2015 |
| Rushmoor Country Farm Park Ltd | Agriculture & fishing | 2014 |
| Russell Williams Limited | Administrative & support | 2019 |
| Ruthmann (UK) Ltd | Professional & scientific | 2008 |
| RVA Property Ltd | Real estate | 2025 |
| Rwja Limited | Real estate | 1961 |
| S & a Bett Limited | Professional & scientific | 2009 |
| S & a Properties (Louth) LLP | | 2006 |
| S & E Straw Ltd | Agriculture & fishing | 2016 |
| S & S (Lincs) Ltd | Health & social care | 2024 |
| S & S Plant Services Limited | Manufacturing | 2015 |
| S L S Scaffolding Limited | Professional & scientific | 2011 |
| S R Willson & Co Accountants Limited | Professional & scientific | 2021 |
| S T Wilkinson (Haulage) Limited | Transport & logistics | 2003 |
| S W Clover Groundworks Limited | Construction | 2022 |
| S&C Construction Limited | Construction | 2024 |
| S&J Wells Property Ltd | Financial services | 2020 |
| S.Baxter Construction Limited | Construction | 2015 |
| Saai Store Ltd | Wholesale & retail | 2018 |
| Saddleback Leisure Limited | Hospitality | 2004 |
| Safecontrol Limited | Construction | 1986 |
| Sage Hairdressing (Louth) Ltd | Other services | 2026 |
| Salon Carina Ltd | Other services | 2021 |
| Sandren Holdings Ltd | Manufacturing | 2019 |