| Arsv Ltd | Wholesale & retail | 2015 |
| Artopia Limited | Health & social care | 2025 |
| Asbestos KCB Ltd | Water & waste | 2026 |
| ASC Consultancy Ltd | Professional & scientific | 2025 |
| Asceton Ltd | Transport & logistics | 2023 |
| Ashsai Limited | Hospitality | 2012 |
| ASJ Housing Management Ltd | Real estate | 2025 |
| Aslan & Sekhmet Properties Ltd | Construction | 2022 |
| Associated ASH Blenders Limited | Wholesale & retail | 1994 |
| Astra UK Consulting Company Limited | Professional & scientific | 2021 |
| Astridia Bazaar Ltd | Wholesale & retail | 2024 |
| Astridia Ltd | Information & communication | 2022 |
| Astro Data Ltd | Transport & logistics | 2021 |
| Atalaya Investments Limited | Financial services | 2017 |
| Atlas House Consultancy Ltd | Construction | 2004 |
| Atlas PHD Ltd | Extraterritorial | 2021 |
| Attention Deficit Music & Media Limited | Information & communication | 2025 |
| ATW Group Ltd | Wholesale & retail | 2020 |
| Audio Wave Limited | Manufacturing | 2007 |
| Augain (UK) Limited | Wholesale & retail | 2004 |
| Aura Zone Ltd | Wholesale & retail | 2025 |
| Aurora Food Trading Co Limited | Wholesale & retail | 2026 |
| Autumnpear Limited | Hospitality | 2020 |
| AV Advisors UK Limited | Financial services | 2023 |
| Avartis Limited | Hospitality | 2019 |
| Aveta Stores Limited | Wholesale & retail | 2025 |
| AVH Solutions Ltd | Information & communication | 2021 |
| Avon UK Trading Limited | Wholesale & retail | 2026 |
| AW Education Consultancy Ltd | Professional & scientific | 2024 |
| Awayexpress Limited | Hospitality | 2025 |
| Ayan & Ayat Properties Ltd | Real estate | 2026 |
| Ayesha Sharif Medical International Ltd | Health & social care | 2015 |
| B. Anna Healthcare Ltd | Health & social care | 2021 |
| B.P.S. (Bespoke Property Service) Ltd | Construction | 2016 |
| B.Rumsey Building Ltd | Construction | 2024 |
| B.W.B.S. Limited | Wholesale & retail | 1995 |
| BAA Solicitors Ltd | Professional & scientific | 2025 |
| Baba Consultancy Services Ltd. | Professional & scientific | 2010 |
| Babeeboo Limited | Other services | 2018 |
| Back Office Services and Support UK Limited | Professional & scientific | 2013 |
| Bakerfield Melter Hire Ltd | Administrative & support | 2020 |
| Bald Voodoo Limited | Information & communication | 2023 |
| Balmuir Investments Ltd | Construction | 1993 |
| Balmuir Trading Limited | Construction | 1990 |
| Balola Home TLC Ltd | Construction | 2016 |
| Bammeke and Haberfelner Worldwide Ltd | Information & communication | 2024 |
| Banana Print Limited | Manufacturing | 2026 |
| Bangs Yana Ltd | Water & waste | 2026 |
| Bar UP the Road Limited | Hospitality | 2024 |
| Barfi Co Ltd | Wholesale & retail | 2025 |
| Bari Catering Limited | Hospitality | 2024 |
| Barnfield Gate Exeter Freehold Ltd | Real estate | 2023 |
| Barrierprowaterproofing Ltd | Construction | 2025 |
| Basilica Italian Restaurant Limited | Hospitality | 2020 |
| Bassemsaleh Limited | Health & social care | 2021 |
| Baxter Building Ltd | Real estate | 2010 |
| BBM Direct Ltd | Real estate | 2018 |
| Bclinic Limited | Health & social care | 2026 |
| Bclw Ltd | Education | 2020 |
| BDS Pest Control Ltd | Administrative & support | 2026 |
| BE My Guest Cafe Limited | Hospitality | 2024 |
| Beacon Placements Limited | Health & social care | 2019 |
| Beacon Shelters Ltd | Real estate | 2025 |
| Beans on Toast Gifts Ltd | Manufacturing | 2024 |
| Beanstalk Productions Ltd | Information & communication | 2017 |
| Beautiful Faces Academy & Coaching Ltd | Other services | 2026 |
| Beauty Cloud Ltd | Real estate | 2019 |
| Beauty Harmony Mari Limited | Wholesale & retail | 2022 |
| Beauty Road Ltd | Real estate | 2022 |
| Beechcastle Limited | Real estate | 2004 |
| Bekas Consultancy Limited | Professional & scientific | 2015 |
| Bellamy Contracts Ltd | Construction | 2025 |
| Belweder Delicatessen Ltd | Wholesale & retail | 2019 |
| BEN Belkaid Limited | Wholesale & retail | 2013 |
| BEN Okai Services Limited | Health & social care | 2026 |
| Benfleet Food Limited | Hospitality | 2015 |
| Benjamin C Mills Ltd | Information & communication | 2024 |
| Bentley Container Homes Limited | Construction | 2025 |
| Bentley Design and Developments Limited | Construction | 2025 |
| Bentley Steel Buildings Limited | Construction | 2025 |
| Berni King Ltd | Extraterritorial | 2021 |
| Bethel CAN Limited | Real estate | 2024 |
| Bethlehem Trading Post Limited | Extraterritorial | 1994 |
| Bettercallmeghost Ltd | Wholesale & retail | 2024 |
| Bidston Draughting Ltd | Construction | 2012 |
| Big Red Machine Essex Ltd | Wholesale & retail | 2025 |
| Bijou London Ltd | Professional & scientific | 2021 |
| BIN2CLEAN Ltd | Administrative & support | 2025 |
| Bintel Limited | Hospitality | 2014 |
| Bismillah Properties Essex Limited | Real estate | 2022 |
| Bismillah Properties Freehold Ltd | Real estate | 2022 |
| Bismillah Solutions Limited | Hospitality | 2022 |
| BIT Cars Southend Ltd | Wholesale & retail | 2024 |
| Bitblaze Ltd | Information & communication | 2023 |
| BJ Investment Holdings Ltd | Real estate | 2025 |
| Black Caesarz Ltd | Hospitality | 2019 |
| Black Diamond Contents & CIA. Ltd | Wholesale & retail | 2025 |
| Blackcliff Builders Ltd | Construction | 2018 |
| Blackhawk Insurance Services Limited | Financial services | 2013 |
| Blackleaf Mechanical and Engineering Ltd | Construction | 2025 |