| AYM Contracting Ltd | Construction | 2020 |
| AZE Investments Ltd | Real estate | 2021 |
| Azheer Limited | Other services | 2026 |
| Azlan Housing Ltd | Real estate | 2017 |
| AZO Print Limited | Manufacturing | 2010 |
| Aztec Day Services Limited | Health & social care | 2021 |
| Azure Logistics Limited | Administrative & support | 2015 |
| B & N Scaffolding Ltd | Construction | 2018 |
| B & S Distribution Limited | Other services | 2015 |
| B & S Lawani Logistics Limited | Transport & logistics | 2021 |
| B & Sons Company Ltd | Professional & scientific | 2021 |
| B and D Developments (London) Limited | Construction | 2000 |
| B B Brickwork & Developments Ltd | Construction | 2026 |
| B B Contracts Group Limited | Financial services | 2023 |
| B B Contracts Limited | Administrative & support | 2009 |
| B B Landscaping Ltd | Administrative & support | 2026 |
| B Banfield Cleaning Solutions Ltd | Administrative & support | 2024 |
| B K Healthcare (Southern) Limited | Health & social care | 2016 |
| B MAS Fire Safety Consultant Limited | Public administration | 2023 |
| B P Monahan Limited | Wholesale & retail | 2006 |
| B Watson Scaffolding Ltd | Construction | 2024 |
| B&B Decorative Services Ltd | Construction | 2012 |
| B-Janko Trading Limited | Administrative & support | 2020 |
| B-On Electrical Ltd | Construction | 2023 |
| B.I.G Hairdressing Academy Ltd | Education | 2025 |
| B1 Barber (Kent) Ltd | Other services | 2025 |
| B2MEN Limited | Wholesale & retail | 2024 |
| B5 Solutions Ltd | Construction | 2019 |
| B6 Property Limited | Real estate | 2021 |
| Baaz Driving School Ltd | Education | 2025 |
| Babtit Services Ltd | Other services | 2020 |
| Bactura Limited | Wholesale & retail | 2003 |
| Badabing Tickets Limited | Wholesale & retail | 2026 |
| Baidex Pharma Ltd | Wholesale & retail | 2020 |
| Baillie Procurement Services Limited | Real estate | 2026 |
| Bains Consultancy Limited | Information & communication | 1997 |
| Bajwa Trading Group Ltd | Transport & logistics | 2023 |
| Baked by Allina Ltd | Hospitality | 2025 |
| Ballty HGV Limited | Transport & logistics | 2015 |
| Baltic Wharf (Gravesend) Management Company Limited | Real estate | 2003 |
| Balticus Tabby Ltd | Agriculture & fishing | 2023 |
| Bamboo Propco Limited | Real estate | 2019 |
| Bar (South) Developments Ltd | Real estate | 2023 |
| Bar Media Limited | Information & communication | 2015 |
| Baraka Cleaning Ltd | Administrative & support | 2025 |
| Bare Bones Canterbury Ltd | Hospitality | 2024 |
| Bare Bones Eastbourne Ltd | Hospitality | 2025 |
| Bare Bones Events Ltd | Hospitality | 2025 |
| Bare Bones Maidenhead Ltd | Hospitality | 2025 |
| Bare Bones Maidstone Ltd | Hospitality | 2025 |
| Bare Bones Poole Limited | Hospitality | 2025 |
| Bare Bones Ramsgate Ltd | Hospitality | 2024 |
| Bare Bones Rochester Ltd | Hospitality | 2024 |
| Bare Bones Wandsworth Limited | Hospitality | 2025 |
| Bargain Besties Ltd | Wholesale & retail | 2026 |
| Baria Ltd | Real estate | 2023 |
| Barker Financial Planning Limited | Professional & scientific | 2021 |
| Barkers Lithographic Printers Limited | Manufacturing | 2003 |
| Barnaby Skincare Limited | Wholesale & retail | 2020 |
| Barnard Limited | Construction | 2015 |
| Barracuda Marine Ltd | Transport & logistics | 2022 |
| Barrels and Ballistics Ltd | Arts & recreation | 2019 |
| Bartwood Services Limited | Information & communication | 1997 |
| Barwick Carpentry Contractors Limited | Manufacturing | 2018 |
| Base Lifting Services Ltd | Administrative & support | 2017 |
| Basely Virtual Limited | Wholesale & retail | 2026 |
| Basi Estates Ltd | Real estate | 2020 |
| Bassets Solicitors LLP | | 2025 |
| BAT Country Productions Limited | Professional & scientific | 2019 |
| Batchelor Connect Ltd | Administrative & support | 2025 |
| Bates Office Services Ltd | Wholesale & retail | 1997 |
| Battle Sector X Limited | Arts & recreation | 2014 |
| Battle Sector X2 Limited | Arts & recreation | 2020 |
| Bauvill Commercial Limited | Construction | 2020 |
| Bauvill Education Limited | Construction | 2021 |
| Bauvill Facilities Limited | Administrative & support | 2020 |
| Bauvill Group Limited | Financial services | 2020 |
| Bauvill Health Limited | Construction | 2020 |
| Bauvill Investments Limited | Financial services | 2025 |
| Bauvill Ltd. | Construction | 2014 |
| Bauvill Projects Limited | Construction | 2023 |
| BAW Access Ltd | Construction | 2020 |
| Bay Healthcare Group Limited | Wholesale & retail | 2024 |
| Bay Saddlery Ltd | Wholesale & retail | 2022 |
| Baymart Limited | Wholesale & retail | 2023 |
| Baywell Property Management Limited | Real estate | 2026 |
| Bazzie Transport Limited | Transport & logistics | 2025 |
| BB One Barber Ltd | Other services | 2026 |
| BB UK Electrical Ltd | Construction | 2022 |
| Bb&K Group Limited | Professional & scientific | 2024 |
| BB4X Ltd | Financial services | 2026 |
| Bbas Consultancy Limited | Professional & scientific | 2003 |
| BC Construction Groundwork Services Ltd | Construction | 2021 |
| BCO Company Secretarial Limited | Extraterritorial | 2015 |
| BCO Corporate Services Limited | Professional & scientific | 2021 |
| BCP Trading Ltd | Hospitality | 2023 |
| BD Framing Ltd | Manufacturing | 2022 |
| BD FX Ltd | Financial services | 2019 |
| Bdfx (Management) Ltd | Financial services | 2019 |
| BDG Group Ltd | Information & communication | 2023 |