| Brixley Properties Ltd | Real estate | 2025 |
| Broad Meadow Estates Ltd | Real estate | 2024 |
| Broad Meadow Property Ltd | Real estate | 2022 |
| Broadbent Maths Ltd | Education | 2003 |
| Broadening Horizons (Have a Go) C.I.C. | Education | 2025 |
| Broadgate Dental Laboratory Limited | Health & social care | 2013 |
| Brocklesby Motorcycles Limited | Wholesale & retail | 1978 |
| Broda Tiling Ltd | Other services | 2020 |
| Broddle Partnership Ltd | Construction | 2020 |
| Bromhead Medical Charity | Health & social care | 1981 |
| Bronze PIG Guest Rooms Limited | Hospitality | 2024 |
| Brook & Mayo Trustees Limited | Financial services | 2016 |
| Brook Civil Engineering Limited | Construction | 2018 |
| Brook Developments UK Limited | Construction | 2002 |
| Brook House Consulting Limited | Professional & scientific | 2025 |
| Brook House Forge Limited | Agriculture & fishing | 2020 |
| Brooks Builders & Construction Management Ltd | Construction | 2024 |
| Brooks Butchers Ltd | Wholesale & retail | 2021 |
| Brooks Window Specialists Ltd | Construction | 2024 |
| Brookside Hub C.I.C. | Health & social care | 2019 |
| Brookside VR Ltd | Professional & scientific | 2019 |
| Brother Plant Hire Ltd | Wholesale & retail | 2020 |
| Broughton Lambert Accountants Limited | Professional & scientific | 2005 |
| Broughton Powell Furniture Limited | Manufacturing | 1995 |
| Brown Enterprises (Lincoln) Limited | Transport & logistics | 2012 |
| Browne Brothers Metal Group Holdings Limited | Financial services | 2026 |
| Browne Brothers Metal Group Limited | Wholesale & retail | 2026 |
| Broxholme Transport Limited | Transport & logistics | 2003 |
| Brsf Consulting Limited | Professional & scientific | 2024 |
| Bruce Fine Properties Ltd | Manufacturing | 2004 |
| Brundell Woolley Ltd | Professional & scientific | 2014 |
| Brutal Buffalo Ltd | Wholesale & retail | 2024 |
| Brutalins Ltd | Administrative & support | 2025 |
| Brynshaw Finance Limited | Administrative & support | 2025 |
| Bryza Aviation Ltd | Transport & logistics | 2026 |
| BSR Security Ltd | Administrative & support | 2023 |
| BTC Software Services Limited | Information & communication | 2020 |
| BTF Law Limited | Professional & scientific | 2026 |
| BTS Advice Centre Ltd | Administrative & support | 2021 |
| Bubbles Daycare (Lincoln) Limited | Agriculture & fishing | 2013 |
| Buchner Holdings Limited | Financial services | 2019 |
| Buckley Exports Ltd | Wholesale & retail | 2015 |
| Budget Finds Store Ltd | Wholesale & retail | 2025 |
| Bufc Community Interest Company | Real estate | 2013 |
| Bugs and Bytes Computing Ltd | Other services | 2020 |
| Building Bugs Ltd | Information & communication | 2025 |
| Building Services Commissioning Limited | Construction | 2005 |
| Builds by Tripp Ltd | Construction | 2025 |
| Built Heritage Consultants Ltd | Professional & scientific | 2023 |
| Bulis Transport Ltd | Transport & logistics | 2018 |
| Bullingdon Medicolegal Ltd | Health & social care | 2024 |
| Burley & Elsom Ltd | Construction | 2014 |
| Burnswell Group Ltd | Wholesale & retail | 2025 |
| Burrows Enterprise Services Ltd | Arts & recreation | 2010 |
| Burstow Property Services Ltd | Administrative & support | 2023 |
| Burton & Co LLP | | 2008 |
| Burton & Wilson Ltd | Wholesale & retail | 2009 |
| Burton Cedar Investments Limited | Administrative & support | 2008 |
| Burton Cliffe Management Company Limited | Households | 2007 |
| Burton Court Management Company Limited | Real estate | 1983 |
| Burton Hall Estate Limited | Real estate | 1992 |
| Burton Hathow Preparatory School Limited | Education | 2012 |
| Burton Mews Management Company Limited | Households | 2002 |
| Burton Road Apartments Limited | Real estate | 2016 |
| Burton Road Chippy Limited | Hospitality | 2014 |
| Burton Road Developments Ltd | Real estate | 2011 |
| Burton Road Management Company NO.1 Limited | Real estate | 2016 |
| Burton Waters (South Coast) Limited | Wholesale & retail | 2006 |
| Burton Waters Clinic Limited | Wholesale & retail | 2014 |
| Burton Waters East Coast Limited | Professional & scientific | 2008 |
| Burton Waters Estates Limited | Real estate | 2018 |
| Burton Waters Management Limited | Real estate | 1998 |
| Burton Waters Marina Limited | Manufacturing | 2000 |
| Burton Waters Moorings Limited | Administrative & support | 2003 |
| Burton-Brooke Enterprises Limited | Professional & scientific | 2023 |
| Burtonln Ltd | Hospitality | 2026 |
| Bushcraft Training Services Ltd | Education | 2025 |
| Bushy Tails (Lincoln) Limited | Administrative & support | 2023 |
| Business Analytics and Technology Solutions Limited | Professional & scientific | 2020 |
| Business Funding Warehouse Ltd | Financial services | 2021 |
| Business Owner Limited | Wholesale & retail | 2025 |
| Business Tapestry Ltd | Professional & scientific | 2023 |
| Busy-Ness Automation Ltd | Public administration | 2025 |
| Buta Trades Ltd | Wholesale & retail | 2024 |
| Butcher & Beast (Lincoln) Limited | Hospitality | 2024 |
| Butchery Court Ltd | Real estate | 2017 |
| Bute Isle Limited | Professional & scientific | 2017 |
| Butler & Dolan Ltd | Construction | 2015 |
| Butler Technik Group Ltd | Financial services | 2024 |
| Butler Transport Limited | Transport & logistics | 2009 |
| Butlerbus Technik Limited | Wholesale & retail | 1998 |
| Butlers Blocks Ltd | Construction | 2020 |
| Butterflies Care & Support Ltd | Health & social care | 2011 |
| Butterfly Lounge Ltd | Wholesale & retail | 2024 |
| Buzz Cleaning Services Limited | Administrative & support | 2013 |
| Buzz Marketing Communications Ltd | Professional & scientific | 2025 |
| BW Automotive Ltd | Transport & logistics | 2020 |
| Bwomen Gym Ltd | Arts & recreation | 2025 |
| Byland Countryside Services Ltd | Administrative & support | 2012 |
| Bypass Service Station Limited | Wholesale & retail | 2025 |