| Ayhan Erciyas & Associates Ltd | Real estate | 2023 |
| AYP Properties Limited | Real estate | 2020 |
| Ayra Consult Limited | Health & social care | 2023 |
| AYU Ayurveda & Wellness Ltd | Health & social care | 2025 |
| AZ Elena Ltd | Professional & scientific | 2016 |
| Azaan Development Limited | Real estate | 2017 |
| Azanzi Ltd | Information & communication | 2023 |
| Azayat Properties Limited | Real estate | 2017 |
| Azizcan Ltd | Hospitality | 2020 |
| Azure Jewellery UK Limited | Wholesale & retail | 2018 |
| Azya Properties (Ascot) Ltd | Real estate | 2024 |
| Azya Properties Ltd | Real estate | 2022 |
| A£J Roofing Ltd Limited | Construction | 2025 |
| B & B Nails Ltd | Other services | 2023 |
| B & C Options UK Ltd | Financial services | 2023 |
| B & D Cleaning Limited | Extraterritorial | 2016 |
| B & M Assets Limited | Financial services | 2017 |
| B & M Woodford Ltd | Hospitality | 2024 |
| B I R Consulting Ltd | Professional & scientific | 2013 |
| B Rosenberg Limited | Construction | 2015 |
| B Sindha Optical Ltd | Professional & scientific | 2023 |
| B&C Select Ltd | Construction | 2023 |
| B&O Greek Food Limited | Hospitality | 2025 |
| B&O Greek Kitchen Limited | Hospitality | 2025 |
| B. a. Williams (Chemists) Limited | Wholesale & retail | 1961 |
| B. Trans Limited | Transport & logistics | 1979 |
| B.A. Clothing (UK) Limited | Professional & scientific | 2007 |
| B2B Global Limited | Administrative & support | 2016 |
| Baba & Bibi Foods Ltd | Hospitality | 2021 |
| Baba-Dhaba Limited | Information & communication | 2025 |
| Baby Sensory Waltham Forest Ltd | Education | 2016 |
| BAD APE Limited | Arts & recreation | 2025 |
| BAI HUI Ltd | Information & communication | 2021 |
| Baik Agency Limited | Professional & scientific | 2003 |
| Baileys Bar Limited | Hospitality | 2020 |
| Bains Property Ventures Ltd | Real estate | 2026 |
| BAL Developments Ltd | Real estate | 2025 |
| Bala & Ilie Property Solutions Ltd | Real estate | 2025 |
| Bala Construction Ltd | Construction | 2024 |
| Balan Healthcare Ltd | Health & social care | 2022 |
| Balanco Ltd | Wholesale & retail | 2022 |
| Balanco Properties Ltd | Real estate | 2023 |
| Ballingry Property Ltd | Real estate | 2022 |
| Baltasound Ltd | Financial services | 2021 |
| Bamboleo Records Ltd | Information & communication | 2018 |
| Bamboos Bamboo Limited | Wholesale & retail | 2019 |
| Bancroft's Enterprises Ltd. | Arts & recreation | 2002 |
| Bandida Ltd | Administrative & support | 2021 |
| Bang Limited | Hospitality | 2003 |
| Bangla Flavour Ltd | Hospitality | 2014 |
| Bangsy Maintenance & Building Services Ltd | Construction | 2016 |
| Banyan Investments Limited | Administrative & support | 2014 |
| Baraka Halal Butcher Ltd | Wholesale & retail | 2022 |
| Barbican Stationers Limited | Wholesale & retail | 1998 |
| Barcodex Limited | Information & communication | 2009 |
| Barkantine Investment Holdings Ltd | Real estate | 2021 |
| Barncroft Limited | Professional & scientific | 2002 |
| Barnett Young & Partners Ltd | Professional & scientific | 2025 |
| Base 2 SET Ltd | Administrative & support | 2024 |
| Basi Sbms Ltd | Real estate | 2025 |
| Bates Property Services LLP | | 2021 |
| Baycrest Developments Limited | Construction | 2010 |
| Baycrest Property Limited | Construction | 2014 |
| Bayswood Construction Ltd | Construction | 2017 |
| Baytur UK Limited | Hospitality | 2017 |
| BC Oral Medicine Ltd | Health & social care | 2021 |
| BCM Ghana Limited | Professional & scientific | 2026 |
| Bcmi Limited | Professional & scientific | 2024 |
| Bdt-Media Limited | Administrative & support | 2018 |
| BE OUR Guests Limited | Real estate | 2016 |
| BE Your Own XSD Collective Consultancy Limited | Administrative & support | 2016 |
| Beach Street Consulting Limited | Professional & scientific | 2017 |
| Beach View Consulting Ltd | Professional & scientific | 2022 |
| Beam Developers Ltd | Construction | 2020 |
| Beam Property Group Limited | Real estate | 2022 |
| Bean Reaper Ltd | Wholesale & retail | 2025 |
| Bear and Hammers Ltd | Manufacturing | 2020 |
| Bear Bites Horse Ltd | Real estate | 2026 |
| Beastall Properties Limited | Real estate | 2023 |
| Beaufort Maritime Ltd | Professional & scientific | 2016 |
| Beaumont Interiors (London) Limited | Wholesale & retail | 2009 |
| Beauty by D’Allure Ltd | Wholesale & retail | 2025 |
| Beautyhq London Ltd | Other services | 2020 |
| Beccles Valeting Centre Ltd | Other services | 2009 |
| Bedhampton Road Limited | Real estate | 2022 |
| BEE Aesthetic (South East) Ltd | Other services | 2026 |
| BEE Positive Ltd | Construction | 2013 |
| Beehalf Ltd | Administrative & support | 2023 |
| Beemer Ltd | Wholesale & retail | 2023 |
| Behan New House Park Limited | Real estate | 2022 |
| Behan Partnership Limited | Professional & scientific | 2014 |
| Behan Property Limited | Other services | 2017 |
| Behan Residential Limited | Real estate | 2018 |
| Beity Ltd. | Manufacturing | 2008 |
| Belgique (Woodford) Ltd | Hospitality | 2011 |
| Belgique the Broadway Limited | Hospitality | 2020 |
| Belka Energy Limited | Construction | 2021 |
| Belka Ventures Limited | Real estate | 2023 |
| Bell Painting and Decorating Limited | Construction | 2025 |
| Bella Intonaco Polish Plastering Ltd | Other services | 2016 |