| Mullen Radiography Services Ltd. | Construction | 2014 |
| Murdoch Troon Interiors Ltd | Extraterritorial | 2020 |
| MW Tax and Accounting Limited | Professional & scientific | 2024 |
| Nationwide School Uniforms Limited | Wholesale & retail | 2021 |
| Nelson Butt Spilsby Limited | Hospitality | 2022 |
| Nervous Squirrel Ltd. | Arts & recreation | 2013 |
| Newton Fallowell (Spilsby) Limited | Real estate | 2014 |
| Northcote Heavy Horse Centre | Arts & recreation | 2010 |
| Number Nine Solutions Limited | Construction | 2021 |
| Nuvicta Property Ltd | Hospitality | 2025 |
| Off-Grid Dynamics Ltd | Construction | 2025 |
| Onyesho Limited | Information & communication | 2014 |
| Operation Wallacea (Wildlife Education) Limited | Education | 2000 |
| Operation Wallacea Limited | Professional & scientific | 1999 |
| Otterwood Cottage Ltd | Agriculture & fishing | 2025 |
| P.Gilbert Livestock Ltd | Agriculture & fishing | 2019 |
| Papino Store Ltd | Wholesale & retail | 2025 |
| Paul Hammond Cleaning Services Limited | Administrative & support | 2002 |
| Paul Jackson Potatoes Limited | Wholesale & retail | 1981 |
| Paulynne Enterprises Ltd | Real estate | 2021 |
| PAY AS YOU Go Business Solutions Ltd | Information & communication | 2021 |
| Peal Engineering Limited | Extraterritorial | 1981 |
| Peasgate Consulting Ltd | Professional & scientific | 2023 |
| PGD Enterprises Limited | Information & communication | 2013 |
| Pip's Parlour Limited | Other services | 2017 |
| Pizza Palace 5 Limited | Hospitality | 2025 |
| PJP Foods Services Limited | Wholesale & retail | 1985 |
| PR Surveying Services Limited | Construction | 1998 |
| Premier Liveaboard Diving Limited | Administrative & support | 2010 |
| Professional Learning Academy Ltd | Education | 2021 |
| Project Retail Ltd | Professional & scientific | 2003 |
| PTC Electrical Limited | Manufacturing | 2011 |
| Pukkagen Ltd | Professional & scientific | 2021 |
| QSA Ltd | Professional & scientific | 2023 |
| R. H-J. (Farms) Limited | Agriculture & fishing | 1972 |
| R.E. Hudson (Farms) Limited | Agriculture & fishing | 1978 |
| R.E.S. Bowser Limited | Agriculture & fishing | 1971 |
| RAE Outdoor Wear Ltd | Wholesale & retail | 2013 |
| Raithby Court Management Company Limited | Extraterritorial | 1992 |
| Rajneels Group Ltd | Wholesale & retail | 2014 |
| Red Lion East Kirkby Limited | Hospitality | 2023 |
| Redstone 63 Limited | Wholesale & retail | 2024 |
| Redstone 64 Limited | Professional & scientific | 2024 |
| Redstone Group Limited | Financial services | 2023 |
| Reflections Windows Limited | Construction | 2004 |
| Replanet Limited | Professional & scientific | 2022 |
| Rich Professional Services Ltd | Professional & scientific | 2025 |
| Rich’S Property Services Ltd | Real estate | 2025 |
| Roofing & Renovations Ltd | Construction | 2025 |
| Rowhire Holdings Ltd | Administrative & support | 2016 |
| Saturn 5 Limited | Professional & scientific | 2022 |
| Scorer Hawkins Architects Limited | Professional & scientific | 2020 |
| Scorer Hawkins Properties Limited | Construction | 2022 |
| Shotbowl Limited | Manufacturing | 2011 |
| Sisbro Limited | Other services | 1989 |
| Skendleby Texels Limited | Agriculture & fishing | 1993 |
| Skitini Care Homes Limited | Health & social care | 2003 |
| Skitini Enterprise Gadgets Limited | Extraterritorial | 2013 |
| Spellow Limited | Agriculture & fishing | 2013 |
| Spilsby Autocentre Ltd | Wholesale & retail | 2022 |
| Spilsby Hand Car Wash & Valeting Ltd | Administrative & support | 2025 |
| Spilsby Masala HUT Limited | Hospitality | 2023 |
| Spilsby Pavilion Ltd | Arts & recreation | 2025 |
| Spilsby Sessions House | Arts & recreation | 2019 |
| Spilsby Show Limited | Other services | 2009 |
| Spilsby Stores Ltd | Wholesale & retail | 2024 |
| SRB (Lincs) Ltd | Agriculture & fishing | 2014 |
| Standon Building Co (Boston) Ltd | Real estate | 2014 |
| Standon Homes (Boston) Ltd | Real estate | 2014 |
| Stickland Construction Ltd | Construction | 2023 |
| Stockwith Mill Ltd | Hospitality | 2022 |
| Sustainable Fashion Ltd | Wholesale & retail | 2020 |
| SVG Developments Ltd | Construction | 2025 |
| Tech to Door Limited | Wholesale & retail | 2013 |
| Thai Environment Development (UK) Ltd | Wholesale & retail | 2024 |
| THE Academy of Life Planning Limited | Professional & scientific | 2012 |
| THE Biodiversity Credit Company Limited | Professional & scientific | 2022 |
| THE Blueberry Academy Limited | Administrative & support | 2007 |
| THE Eaves Restaurant Ltd | Hospitality | 2003 |
| THE Fence MAN Limited | Construction | 2003 |
| THE FOX Businesses Limited | Wholesale & retail | 1998 |
| THE Melbourne Centre CIC | Administrative & support | 2010 |
| THE Old Bowling Alley Ltd | Wholesale & retail | 2023 |
| THE Red Lion Raithby Ltd | Hospitality | 2026 |
| THE Retreat@The Inn Limited | Real estate | 2022 |
| THE Sessions House CIC | Arts & recreation | 2016 |
| THE Tote Store Ltd | Wholesale & retail | 2024 |
| THE Tree House Children's Centre | Health & social care | 2010 |
| THE Wheel Inn (Welton-Le-Marsh) Ltd | Hospitality | 2015 |
| Thorpe Farm Ltd | Construction | 2024 |
| Thrive Lincs Ltd | Education | 2023 |
| Titan Leisure Ltd | Hospitality | 2024 |
| TKG Transport Limited | Transport & logistics | 2015 |
| Tong Engineering Group Limited | Financial services | 2023 |
| Tong Engineering Limited | Manufacturing | 1985 |
| Tony Lawie Electrical Ltd | Construction | 2003 |
| Total Install Limited | Information & communication | 2015 |
| Toynton Herbs Ltd | Agriculture & fishing | 2024 |
| Treedale Farm Produce Limited | Wholesale & retail | 1985 |
| Tuscan Capital Management | | 1999 |