| Axel Employment Ltd | Administrative & support | 2023 |
| Ayadsisf Ltd | Wholesale & retail | 2025 |
| Ayoma Ltd | Hospitality | 2025 |
| Ayscoughfee Hall School Limited | Education | 1958 |
| Azpmd Limited | Construction | 2024 |
| B & C Kalane Ltd | Professional & scientific | 2024 |
| B & E Logistics (Cambs) Ltd | Transport & logistics | 2021 |
| B & H (2005) Limited | Real estate | 2005 |
| B and M Services (Lincs) Ltd | Construction | 2020 |
| B Bronze Ventures Ltd | Administrative & support | 2025 |
| B Gold Ventures Ltd | Administrative & support | 2025 |
| B Silver Ventures Ltd | Health & social care | 2025 |
| B W Belding Limited | Extraterritorial | 2023 |
| B W Roofing (Midlands) Ltd | Construction | 2025 |
| B&L Group Holdings Limited | Financial services | 2021 |
| B&L Group Property Limited | Administrative & support | 2009 |
| B. Allsop & Sons Limited | Water & waste | 2004 |
| B.F. Engineering Links Ltd | Manufacturing | 2025 |
| B.J.S. Properties Limited | Administrative & support | 1981 |
| B.M.T. Transport Services (2025) Ltd | Administrative & support | 2025 |
| B.M.T. Transport Services Ltd | Administrative & support | 2017 |
| B.Y.C Trans Limited | Transport & logistics | 2011 |
| B2 Wealth Ltd | Financial services | 2012 |
| Baanbee Ltd | Wholesale & retail | 2021 |
| BAC Property Developments Limited | Construction | 2020 |
| Bacca Associates Ltd | Professional & scientific | 2019 |
| Bace Family Ltd | Extraterritorial | 2020 |
| Bacon & Webb Ltd | Real estate | 2020 |
| Badass Jewellery Ltd | Arts & recreation | 2018 |
| BAE Associates Limited | Professional & scientific | 2017 |
| BAK Accounting Ltd | Professional & scientific | 2017 |
| Bakcraft Roofing Solutions Ltd | Construction | 2025 |
| Baker R Limited | Wholesale & retail | 2018 |
| Balerite Ltd | Professional & scientific | 2025 |
| Bamse Features Limited | Information & communication | 2006 |
| Bamse Limited | Information & communication | 2006 |
| Bank House Farm Limited | Administrative & support | 2010 |
| Banton Properties Limited | Real estate | 2023 |
| BAP Midlands Ltd | Wholesale & retail | 2021 |
| Barefoot Lincs Ltd | Health & social care | 2023 |
| Barefoot Traveller Limited | Administrative & support | 1998 |
| Barker & Whipps Ltd | Administrative & support | 2026 |
| Barkers Farm Lincs Ltd | Wholesale & retail | 2025 |
| Barr Farm (Deeping ST. Nicholas) Management Company Ltd | Administrative & support | 2020 |
| Barrett Road (Block a) Management Company Limited | Real estate | 1991 |
| Barrington Tarn Ltd | Arts & recreation | 2015 |
| Barron Investment Properties Ltd | Financial services | 2025 |
| Barry Hollingsworth Services Ltd | Transport & logistics | 2021 |
| Bart HGV Ltd | Transport & logistics | 2018 |
| Bart Logistics Limited | Transport & logistics | 2025 |
| Bartlett Group (East) Ltd | Construction | 2023 |
| Barwick and Palmer Limited | Administrative & support | 2013 |
| Bast FIX Roofing and Gutters Ltd | Construction | 2025 |
| Baston FEN Investment Company Ltd | Professional & scientific | 2025 |
| Bats Publications Ltd. | Manufacturing | 2017 |
| Battley (Holdings) Ltd | Wholesale & retail | 2023 |
| Baumaster.Co.Uk Trade Ltd | Manufacturing | 2013 |
| Bay Tree 1 Limited | Wholesale & retail | 2018 |
| Bay Tree Hilgay Limited | Wholesale & retail | 2018 |
| Bay Tree Nurseries Limited | Wholesale & retail | 1987 |
| Baytree Car Sales Ltd | Wholesale & retail | 2021 |
| Bazarh Afro-Carribean Foods Ltd | Hospitality | 2024 |
| BB Toy Favor Limited | Wholesale & retail | 2024 |
| BCF Contracting Limited | Wholesale & retail | 2026 |
| BCT Storage & Grading Ltd | Wholesale & retail | 2014 |
| BD Contractors (Yorks) Ltd | Construction | 2025 |
| BDB Freeholds Ltd | Real estate | 2021 |
| BDB Property and Investment Company Limited | Construction | 2006 |
| BDM Clinical Ltd | Health & social care | 2018 |
| BDM Trans (Lincs) Ltd | Transport & logistics | 2026 |
| Beach & Mason Limited | Health & social care | 2024 |
| Beale Accountancy Services Limited | Professional & scientific | 2018 |
| Beardhog Solutions Ltd | Information & communication | 2025 |
| Beatsfit Ltd | Arts & recreation | 2016 |
| Beaumont Roofing and Renovations Ltd | Construction | 2025 |
| Beautiful YOU Beauty Limited | Other services | 2019 |
| Beauty and Elash Ltd | Professional & scientific | 2025 |
| Bebright Classes Limited | Education | 2017 |
| Bedford Electrical Services Ltd | Construction | 2018 |
| BEE Barber Shop Ltd | Other services | 2023 |
| Beehoo Surveying Limited | Professional & scientific | 2020 |
| Beijing Beijing Ltd | Hospitality | 2024 |
| Beinn Consultancy Ltd | Professional & scientific | 2019 |
| Belaud Limited | Hospitality | 2025 |
| Belco (UK) Limited | Wholesale & retail | 2005 |
| Bell Lane Associates Ltd. | Real estate | 2014 |
| Belle VUE (Holbeach) Management Company Limited | Real estate | 2014 |
| Belle VUE Accounts Limited | Professional & scientific | 2018 |
| Bellona Drive Ltd | Transport & logistics | 2025 |
| Belmont Carpenters (UK) Limited | Construction | 2013 |
| Belnie Limited | Hospitality | 2025 |
| BEN Ralph Shellfish Limited | Agriculture & fishing | 2019 |
| Benchmark Clerk of Works Services Ltd | Professional & scientific | 2025 |
| Benefix Ltd | Professional & scientific | 2024 |
| Beniwave Ltd | Professional & scientific | 2026 |
| Bentleys Bar Ltd | Hospitality | 2011 |
| Berry Grove Childcare Ltd | Health & social care | 2023 |
| Bert Transport Ltd | Transport & logistics | 2021 |
| Besafe Behaviour Training Limited | Education | 2012 |
| Bespoke Control Systems Ltd | Construction | 2022 |