| AZ Property and Investments Ltd | Real estate | 2020 |
| B & B Cleaning & Maintenance Kent Ltd | Administrative & support | 2010 |
| B & E Automotive Precision Ltd | Manufacturing | 2025 |
| B & W Lift Services Limited | Manufacturing | 2003 |
| B Double a Global Services Limited | Other services | 2018 |
| B M Stamps Ltd | Wholesale & retail | 2010 |
| B&D Vehicle Services Ltd | Wholesale & retail | 2022 |
| B&E Live Limited | Information & communication | 2025 |
| B. Gunner Limited | Transport & logistics | 2008 |
| B.A.T.A Developments Ltd | Real estate | 2026 |
| B.A.T.A. Holdings Ltd | Financial services | 2025 |
| B.C.M. Festivals Limited | Arts & recreation | 2001 |
| B.G.C. Property Limited | Construction | 1995 |
| B.N. Pumps Limited | Water & waste | 2000 |
| B.R.F.M. Bridge Radio Limited | Information & communication | 2004 |
| B.W.May & SON Limited | Construction | 1971 |
| B006 Ltd | Administrative & support | 2022 |
| BAA Services South East Limited | Administrative & support | 2025 |
| Baaa Property Ltd | Real estate | 2026 |
| Baba Property Services Ltd | Real estate | 2002 |
| Babajide Dasilva Ltd | Professional & scientific | 2025 |
| Babsegalur Ltd | Wholesale & retail | 2024 |
| Baby-Led Weaning Limited | Professional & scientific | 2010 |
| Bacchus Franchise Limited | Households | 2025 |
| Back and Forth Limited | Transport & logistics | 2003 |
| Bacon the Play Limited | Arts & recreation | 2023 |
| BAD B Hypnotherapy Ltd | Other services | 2022 |
| Baden Developments Limited | Real estate | 2018 |
| Baflaw Ltd | Transport & logistics | 2024 |
| Bah-Yith Ltd | Real estate | 2021 |
| Baileys Coffee Shop Limited | Wholesale & retail | 2024 |
| Baker's Record Shops Limited | Households | 1961 |
| Balan Services Ltd | Other services | 2016 |
| Balancedcore Ltd | Wholesale & retail | 2025 |
| Balcan Logistic Ltd | Transport & logistics | 2023 |
| Balck & White Limited | Hospitality | 2023 |
| Baldwin Solutions Limited | Professional & scientific | 2023 |
| Baltic Sea (Forest Products) Ltd | Wholesale & retail | 2021 |
| Banner Lettings & Investments Limited | Real estate | 2002 |
| Banquerex Financial Corp. Limited | Financial services | 2022 |
| Banu's Transport Limited | Transport & logistics | 2020 |
| Bapchild Hand Car Wash Ltd | Administrative & support | 2018 |
| Barberry Assets Limited | Real estate | 2026 |
| Barberry Medical Services Ltd | Health & social care | 2023 |
| Barlow & Sons Limited | Professional & scientific | 2014 |
| Barnes Bros. Holdings Ltd | Financial services | 2023 |
| Barnes Offshore Ltd | Other services | 2011 |
| Barnstore Ltd | Real estate | 2016 |
| Barrett Webb Mechanical Ltd | Construction | 2025 |
| Bartet Healthcare Ltd | Wholesale & retail | 2025 |
| Bartlett & Bartlett Property Consultants Ltd | Real estate | 2020 |
| Barwell Roofing Ltd | Construction | 2025 |
| Basic Skills Test Limited | Administrative & support | 2003 |
| Bastion Holdings Limited | Financial services | 2022 |
| Bausystem Ltd | Professional & scientific | 2023 |
| BAX Farm Juice Ltd | Manufacturing | 2015 |
| Baxtech Services Ltd | Wholesale & retail | 2020 |
| Bayford Meadow Kart Circuit Limited | Arts & recreation | 2000 |
| Bayford Meadow Kart Club Limited | Professional & scientific | 2008 |
| Bayford Meadows Kart Racing Club Ltd. | Arts & recreation | 2012 |
| Bayford Meadows Racing Club | Arts & recreation | 2020 |
| BB Financials Ltd | Administrative & support | 2023 |
| BCC Rail Ltd | Transport & logistics | 2019 |
| BCF Flooring Ltd | Wholesale & retail | 2019 |
| BCH Consultants LLP | | 2021 |
| BCM Entertainments Ltd | Arts & recreation | 2012 |
| BCM Events Ltd | Arts & recreation | 2024 |
| BCM Promotions Ltd | Arts & recreation | 2014 |
| Bcos Detailing Ltd | Other services | 2025 |
| BE Seen Online Ltd | Information & communication | 2013 |
| Beagle Connects Ltd | Construction | 2025 |
| Beam Industrial Fasteners UK Limited | Wholesale & retail | 1995 |
| Beamans Limited | Professional & scientific | 1995 |
| Bear Necessities Decorators & Contractors Ltd | Construction | 2020 |
| Bearingtech Ltd | Professional & scientific | 2011 |
| Beautiful Heritage Trading Company Limited | Hospitality | 2018 |
| Beauty Academy South East Limited | Education | 2016 |
| Becket Mews Residents Company Limited | Households | 1982 |
| Become Performance Ltd | Education | 2023 |
| Bedrocks UK Limited | Wholesale & retail | 2004 |
| Bee's Pets Services Ltd | Other services | 2021 |
| Beeji Limited | Information & communication | 2023 |
| Beko Construction Limited | Construction | 2018 |
| Bell & Moore Ltd | Professional & scientific | 2018 |
| Bell Family Investment Company Limited | Administrative & support | 2023 |
| Bellaabode Limited | Real estate | 2025 |
| Belle Envie Ltd | Other services | 2026 |
| Belmont Kent Limited | Real estate | 2004 |
| Belnor Services Ltd | Real estate | 2015 |
| Belos Consulting Ltd | Professional & scientific | 2019 |
| Belwall Construction Ltd | Construction | 2025 |
| Bemsize Healthcare Limited | Wholesale & retail | 2023 |
| BEN Ingram Limited | Health & social care | 2015 |
| Ben's Solution Services Ltd | Construction | 2016 |
| Bengal Spice Sittingbourne Ltd | Hospitality | 2022 |
| Bennett Opie Holdings Limited | Professional & scientific | 2016 |
| Bentley PUB Management Ltd | Hospitality | 2021 |
| Berwick Tax Limited | Professional & scientific | 2015 |
| Besparkle Limited | Professional & scientific | 2005 |
| Bespoke Affordable Kitchens Limited | Construction | 2011 |