| Bowthorpe House Limited | Administrative & support | 2018 |
| Boxed Mortgages Ltd | Financial services | 2025 |
| Bphs Lincoln Ltd | Construction | 2020 |
| BPM - Architecture Ltd | Professional & scientific | 2021 |
| Br&Me Nominees Limited | Professional & scientific | 2020 |
| BR3W Ltd | Wholesale & retail | 2020 |
| Brace Bridge Mini Market Limited | Wholesale & retail | 2010 |
| Bracebridge Heath MOT & Repair Centre Ltd | Wholesale & retail | 2012 |
| Bracebridge Infant and Nursery School Ltd | Education | 2012 |
| Bracebridge Management Company Limited | Real estate | 2005 |
| Bracebridge Tandoori Ltd | Hospitality | 2024 |
| Brack Developments Ltd | Construction | 2019 |
| Bracken Medical Ltd | Health & social care | 2016 |
| Bradley Estates Lincs Limited | Real estate | 2024 |
| Brads Plumbing & Heating Ltd | Energy | 2023 |
| Brailey IT Services Ltd | Information & communication | 2025 |
| Brakesafehgv Ltd | Information & communication | 2026 |
| Bramley Grove Management Company Ltd | Households | 2020 |
| Bramley Meadows Ltd | Agriculture & fishing | 2025 |
| Branch Wholesale Trees Limited | Wholesale & retail | 2025 |
| Brandon Property Services Limited | Real estate | 2019 |
| Brandwell Homes (Lincoln) Limited | Construction | 1964 |
| Bransby Horses | Professional & scientific | 1999 |
| Bransby Horses Trading Limited | Wholesale & retail | 1990 |
| Branston Academy Trust | Education | 2010 |
| Branston Consulting Ltd | Mining & quarrying | 2021 |
| Branston Engineering Limited | Manufacturing | 1970 |
| Branston Filling Station Limited | Manufacturing | 2011 |
| Branston Fish Bar Limited | Hospitality | 2024 |
| Branston Holdings Limited | Professional & scientific | 2006 |
| Branston Junior Academy | Education | 2012 |
| Branston Limited | Manufacturing | 1994 |
| Branston Lodge Developments Limited | Construction | 2006 |
| Branston Potatoes Limited | Extraterritorial | 2010 |
| Branston Prepared Foods Limited | Extraterritorial | 2006 |
| Branston Secure Storage Ltd | Transport & logistics | 2016 |
| Brant Lowfield Ltd | Hospitality | 2025 |
| Brantfell Cottage Limited | Real estate | 2022 |
| Brantfield Cottage Limited | Real estate | 2021 |
| Branwich Limited | Professional & scientific | 2024 |
| Bratsasurology Limited | Health & social care | 2014 |
| Brayford Broadcasting C.I.C. | Information & communication | 2024 |
| Brayford Development Company Limited | Extraterritorial | 1989 |
| Brayford Homes Ltd | Real estate | 2018 |
| Brayford Press Limited | Manufacturing | 2024 |
| Brayford Trust Limited | Arts & recreation | 1969 |
| Brayland Freehold Ltd | Households | 2025 |
| Brays 469 Management Company Ltd | Real estate | 2014 |
| Breach Management Services Limited | Manufacturing | 2009 |
| Breakaway Surf Ltd | Arts & recreation | 2025 |
| Breakdown Bros Recovery & Salvage Ltd | Transport & logistics | 2025 |
| Breathe Insurance Brokers Ltd | Financial services | 2011 |
| Breathe UX Ltd | Information & communication | 2016 |
| Breniq Limited | Administrative & support | 2025 |
| Brent Building Developments Ltd | Construction | 2012 |
| Bretton Park Management Limited | Agriculture & fishing | 2012 |
| Brew Roulette Limited | Wholesale & retail | 2015 |
| BRG Holdings (Lincoln) Limited | Financial services | 2020 |
| Brian Cade Farms Limited | Agriculture & fishing | 1976 |
| Brian Carr Design Ltd | Construction | 2014 |
| Briarwood Building Contractors Limited | Construction | 2004 |
| Briarwood Construction Ltd | Administrative & support | 2012 |
| Bribery Limited | Manufacturing | 2012 |
| Bric Software Limited | Information & communication | 2020 |
| Brick Lane Garage Ltd | Wholesale & retail | 2020 |
| Brickz Kingdom Ltd | Wholesale & retail | 2023 |
| Bridge Health Limited | Health & social care | 2015 |
| Bridge Mcfarland LLP | | 2017 |
| Bridge Property Solutions Limited | Real estate | 2011 |
| Bridge Risk Control Ltd | Information & communication | 2013 |
| Bridgwater Trading Company Limited | Wholesale & retail | 2011 |
| Brie & Co. Homes Limited | Real estate | 2026 |
| Brigham Properties Limited | Real estate | 2023 |
| Bright Eyes Ltd | Health & social care | 2023 |
| Bright Layer Tech Ltd | Information & communication | 2026 |
| Bright Spark Electrical Lincoln Ltd | Construction | 2017 |
| Bright Spark Media Group Limited | Information & communication | 2016 |
| Bright Spark Studios Limited | Information & communication | 2007 |
| Bright Veterinary Services Limited | Professional & scientific | 2024 |
| Brighter Skies Properties Ltd | Real estate | 2021 |
| Brightmedia Limited | Information & communication | 1994 |
| Briks Construction Ltd | Construction | 2020 |
| Briks Property Ltd | Construction | 2017 |
| Brinda Muthusamy Ophthalmology Ltd | Health & social care | 2024 |
| Brinklefields Ltd | Agriculture & fishing | 2025 |
| Briscoe & Creane Roofing Limited | Construction | 2014 |
| Bristow Building & Property Services Ltd | Construction | 2019 |
| Bristow Electrical Ltd | Construction | 2019 |
| Bristow Heating Ltd | Construction | 2019 |
| Britannia Homes (Ltd) Ltd | Real estate | 2025 |
| Britbargainsshop Ltd | Wholesale & retail | 2025 |
| Britcore Technologies Ltd | Wholesale & retail | 2025 |
| Britcraftshub Ltd | Manufacturing | 2026 |
| British Chlorophyll Company Limited | Manufacturing | 1937 |
| British Crop Driers Limited | Extraterritorial | 1933 |
| British Laryngological Association | Other services | 2013 |
| British Pakistani Orthopaedic Society CIC | Other services | 2021 |
| Britmesh Limited | Wholesale & retail | 2018 |
| Britned Ltd | Construction | 2019 |
| Britpak Trading Limited | Wholesale & retail | 2024 |