| Brightlight Fireworks Limited | Arts & recreation | 2018 |
| Brigsley Medical Services Limited | Health & social care | 2013 |
| Brigsley Properties Limited | Extraterritorial | 2008 |
| Brigsley Village Hall | Administrative & support | 2004 |
| Brinkley & Carter Limited | Real estate | 2020 |
| Brinkley and Carter Consulting Ltd | Professional & scientific | 2022 |
| Bristow & Co (UK) Limited | Financial services | 2018 |
| Britannia Immigration Solutions Ltd | Professional & scientific | 2026 |
| Britannia’S Finest Limited | Other services | 2021 |
| Britwaste Ltd | Professional & scientific | 2025 |
| Brnc Limited | Health & social care | 2013 |
| Brocklesby Contracting Limited | Agriculture & fishing | 2012 |
| Brocklesby Estate Limited | Professional & scientific | 2019 |
| Brodir Limited | Professional & scientific | 2018 |
| Brolly Marketing and Consultancy Ltd | Professional & scientific | 2009 |
| Bronrose Limited | Real estate | 1983 |
| Bronze Glow Ltd | Other services | 2025 |
| Brookes Refrigeration & Air Conditioning Limited | Construction | 2010 |
| Brookfield Quality Services Limited | Professional & scientific | 2025 |
| Brooklands Vehicle Remarketing Limited | Wholesale & retail | 2012 |
| Brooklyn Developments Group Ltd | Construction | 2025 |
| Bros 1 Barber Limited | Other services | 2025 |
| Brow & Brush Ltd | Other services | 2026 |
| Brown Autos and Sons Limited | Wholesale & retail | 2019 |
| Brown's Family Butchers Limited | Wholesale & retail | 2013 |
| Browns Property Developers Limited | Construction | 2004 |
| Browns Waste Limited | Water & waste | 2021 |
| Brumpton Limited | Other services | 2017 |
| Brutstone Ltd | Construction | 2016 |
| Bry-Dent Limited | Health & social care | 2024 |
| BSB Maintenance Services Limited | Manufacturing | 2025 |
| BSC Sales & Services Limited | Professional & scientific | 2023 |
| BSP Commercial Property Limited | Real estate | 2026 |
| BST Instruments Ltd | Manufacturing | 2026 |
| BT Electrical Limited | Construction | 2015 |
| BT-7274 Ltd | Transport & logistics | 2025 |
| BTP N Kebab Ltd | Hospitality | 2025 |
| Buddiesworld Ltd | Health & social care | 2023 |
| Budgecrest Limited | Other services | 1990 |
| Buffet Services Ltd | Hospitality | 2017 |
| Build-Dec East Limited | Construction | 2024 |
| Building Planning Services Limited | Professional & scientific | 2022 |
| Building Potential Ltd | Construction | 2011 |
| Building Regulations Approval Services Limited | Construction | 2019 |
| Building Sustainability Group Ltd | Professional & scientific | 2025 |
| Buildwell Builders Limited | Construction | 2012 |
| Built Bikes Ltd | Wholesale & retail | 2023 |
| Bulbecki Properties Limited | Real estate | 2021 |
| Bunker 51 Limited | Arts & recreation | 2010 |
| Burchdaume Ltd | Professional & scientific | 2013 |
| Buren Catering Ltd | Hospitality | 2019 |
| Burley Louth Limited | Wholesale & retail | 2020 |
| Burley Propco Limited | Real estate | 2024 |
| Burley Services Ltd | Professional & scientific | 2022 |
| Burleyh Properties Ltd | Real estate | 2026 |
| Burlington Estates Management Limited | Hospitality | 2012 |
| Bursary Mews Limited | Households | 2001 |
| Burton & SON Investments Ltd | Real estate | 2021 |
| Burton's Engineering Services Ltd | Professional & scientific | 2020 |
| Busibodies Childrens Nursery Ltd | Education | 2023 |
| Business Advice Direct Holding Ltd | Professional & scientific | 2015 |
| Business Advice Direct Invest Ltd | Real estate | 2015 |
| Business Genius Ltd | Professional & scientific | 2015 |
| Busylizzy Epsom and Leatherhead Limited | Other services | 2018 |
| Butt Lane Management Company (Laceby) Limited | Households | 2015 |
| Butterflies (Scartho) Ltd | Wholesale & retail | 2016 |
| Button Plant and Construction Ltd | Construction | 2002 |
| Button Productions Ltd | Construction | 2020 |
| Butts Orchard (Humberston) Management Company Limited | Professional & scientific | 2017 |
| Buzatu Liviu Drive Ltd | Transport & logistics | 2023 |
| Buzz Cafe (Catering) Ltd | Hospitality | 2026 |
| Buzz Cafe (GY) Limited | Hospitality | 2023 |
| Buzz Cafe (Newco) Ltd | Hospitality | 2026 |
| Bwind Ltd | Professional & scientific | 2023 |
| BWN75 Ltd | Transport & logistics | 2017 |
| BY Anna Limited | Other services | 2020 |
| BYG Developments Limited | Real estate | 2021 |
| Byteback Business Systems Limited | Wholesale & retail | 1997 |
| C & C Woodall Limited | Wholesale & retail | 2014 |
| C & E Electrical Services Ltd | Construction | 2018 |
| C & G Cargo Inspection Limited | Transport & logistics | 2017 |
| C & J Cleethorpes Limited | Health & social care | 2007 |
| C & M Fish Limited | Wholesale & retail | 2008 |
| C a B (Lincs.) Trading Limited | Construction | 2014 |
| C a Edwards Property Limited | Real estate | 2018 |
| C and C Autos Limited | Wholesale & retail | 2016 |
| C and L Clee Properties Limited | Real estate | 2024 |
| C Carpentry Limited | Manufacturing | 2010 |
| C D Plumbing & Heating Solutions Limited | Construction | 2017 |
| C Dean Properties Ltd | Real estate | 2025 |
| C Deeley Limited | Construction | 2020 |
| C Fayers Window Cleaning Services Limited | Administrative & support | 2010 |
| C G Lingard Limited | Construction | 2019 |
| C Hutchings Ltd | Health & social care | 2019 |
| C J T Fisheries Limited | Wholesale & retail | 2014 |
| C Johnstone Electrical Limited | Construction | 2018 |
| C N Solutions .FR Limited | Professional & scientific | 2014 |
| C O C Trading Limited | Wholesale & retail | 2004 |
| C R Electrical Contractor Services Limited | Construction | 2016 |
| C S Developments ( Lincs ) Ltd | Real estate | 2019 |