| Aura Associates Limited | Other services | 2014 |
| Aureum Press Ltd | Wholesale & retail | 2025 |
| Aurora Business Consulting Ltd | Professional & scientific | 2018 |
| Aurum Creations Ltd | Arts & recreation | 2024 |
| Australian Wineries (UK) Limited | Professional & scientific | 2008 |
| Autofix 2000 Limited | Wholesale & retail | 2008 |
| AVD Natural Fibre Ltd | Professional & scientific | 2025 |
| Aviation Training Academy Limited | Transport & logistics | 2008 |
| Avipack Ltd | Manufacturing | 2026 |
| Avro Engineering Ltd | Real estate | 2017 |
| AWL Limited | Wholesale & retail | 2007 |
| Awsm Ventures Limited | Professional & scientific | 2015 |
| Axel Group Ltd | Construction | 2023 |
| AYY Capital Group Limited | Real estate | 2025 |
| Azure Property & Equity Trading LLP | | 2023 |
| Azurie Blue Limited | Administrative & support | 2011 |
| Azzo’S Kitchen Limited | Hospitality | 2025 |
| B'Spoke Hair Ltd | Other services | 2025 |
| Bainton Consulting Ltd | Professional & scientific | 2017 |
| Balan Holdings Limited | Financial services | 2018 |
| Balan Homes Ltd | Construction | 2023 |
| Ballutadar Ltd | Hospitality | 2018 |
| Balm Peterborough and Stamford CIC | Health & social care | 2022 |
| Bamboo Forest Ltd | Wholesale & retail | 2020 |
| Bands for Hire Limited | Arts & recreation | 2012 |
| Banfield & Co Ltd | Real estate | 2026 |
| Banfield Properties (UK) Limited | Professional & scientific | 2014 |
| Banjaraa Ltd | Hospitality | 2018 |
| Banthorpe Limited | Administrative & support | 2011 |
| Baraha Food Limited | Hospitality | 2020 |
| Bark and Branch Ltd | Professional & scientific | 2026 |
| Barker Sign Services Limited | Manufacturing | 2014 |
| Barker Tiling Ltd | Construction | 2013 |
| Barklin Real Estate Limited | Real estate | 2016 |
| Barkwith Associates Limited | Agriculture & fishing | 2002 |
| Barkwith Chemical Limited | Professional & scientific | 2023 |
| Barlott Associates Limited | Construction | 2002 |
| Barn Logs Limited | Wholesale & retail | 2026 |
| Barnack Consulting Ltd | Professional & scientific | 2025 |
| Barney Ventures Ltd | Real estate | 2002 |
| Barratt SKW Holdings Ltd | Professional & scientific | 2019 |
| BAT-NR30 Land Ltd | Construction | 2022 |
| BAT-NR30 Ltd. | Construction | 2010 |
| Batemans Auctioneers & Valuers Ltd | Wholesale & retail | 2012 |
| Bathrow Ltd | Real estate | 2014 |
| Bayte Limited | Financial services | 2014 |
| Baytree Health Ltd | Health & social care | 2025 |
| BBG Properties Ltd | Real estate | 2018 |
| Bbrov Ltd | Mining & quarrying | 2022 |
| BCF Equity Partners Limited | Professional & scientific | 2015 |
| BCF Family Investment Partners LLP | | 2025 |
| BCM Wealth Management Ltd | Financial services | 2019 |
| BCS Properties LLP | | 2013 |
| Beach-O-Matic Limited | Arts & recreation | 2002 |
| Beardstrong Limited | Arts & recreation | 2023 |
| Beats Creative Ltd | Professional & scientific | 2024 |
| Beautica Stamford Limited | Other services | 2017 |
| Beauty and the Barbell Ltd | Arts & recreation | 2022 |
| Becmaps Limited | Health & social care | 2024 |
| BEE Nation Limited | Financial services | 2026 |
| Bee.Bee Construction Ltd | Construction | 2014 |
| Beer Buddy Ltd | Wholesale & retail | 2023 |
| Beersaver International Ltd | Administrative & support | 2010 |
| Beersaver Ltd | Professional & scientific | 2010 |
| Beeson Wright Limited | Construction | 2011 |
| Befit Holdings (Rutland) Ltd | Financial services | 2025 |
| Befit Reset Ltd | Health & social care | 2026 |
| Bell Masonry Ltd | Construction | 2018 |
| Belwin Limited | Construction | 2006 |
| BEN Cuthbert Personal Fitness Ltd | Arts & recreation | 2023 |
| Benchmark Properties Limited | Construction | 1999 |
| Benedict Blythe Foundation CIC | Education | 2022 |
| Benji Housing Limited | Real estate | 2021 |
| Bespoke Developments Ketton LLP | | 2012 |
| Bespoke Earth Ltd | Professional & scientific | 2019 |
| Best Barber Cuts Ltd | Other services | 2025 |
| Best Little Holdings Co. Limited | Financial services | 2018 |
| Best Little Homes Limited | Construction | 2021 |
| Best Little MEP Co. Ltd | Construction | 2024 |
| Best Little Projects Co. Limited | Construction | 2018 |
| Best Strategies Ltd | Professional & scientific | 2018 |
| Best to Invest Limited | Financial services | 2001 |
| Betava Ltd | Information & communication | 2019 |
| Better Consultancy Limited | Professional & scientific | 2010 |
| Betterworld Foundation Ltd | Other services | 2020 |
| Betts Engineering Consultancy Ltd | Professional & scientific | 2024 |
| Bevamo Ltd | Wholesale & retail | 2020 |
| BHL (SA) Holdings Limited | Financial services | 2018 |
| BHL (UK) Holdings Ltd | Financial services | 2013 |
| BHL Eurasia Ltd | Financial services | 2013 |
| Bidlow Ltd | Wholesale & retail | 2025 |
| Bidwell Property Limited | Real estate | 2024 |
| Binfield Lettings Company Limited | Real estate | 2022 |
| Bingley Consulting Ltd | Information & communication | 2023 |
| BIO Editions Limited | Information & communication | 2020 |
| Birdie Solutions Limited | Professional & scientific | 2023 |
| Birdwood Construction Group Ltd | Real estate | 2020 |
| Birdwood Construction Ltd | Construction | 2015 |
| Birdwood Developments Ltd | Construction | 2021 |
| Biriyani House Restaurant Limited | Hospitality | 2025 |