| Aspired Digital Ltd | Professional & scientific | 2018 |
| Assured Drives & Patios by Design Limited | Administrative & support | 2022 |
| ASW Logistics and Installations Limited | Construction | 2025 |
| Ata&Co Ltd | Construction | 2015 |
| ATL Haulage Contractors Limited | Transport & logistics | 2008 |
| Atolagbe STA Limited | Transport & logistics | 2013 |
| Atomic Hygiene Limited | Professional & scientific | 2025 |
| Atomic Stats Limited | Information & communication | 2023 |
| Audrey International Ltd | Professional & scientific | 2023 |
| Auralashesandaesthetics Ltd | Other services | 2024 |
| Austen Aesthetics Ltd. | Health & social care | 2024 |
| Austin Ripley Investments Limited | Real estate | 2013 |
| Auto Channel Ltd | Wholesale & retail | 2014 |
| Autocare (Benfleet) Limited | Wholesale & retail | 1984 |
| Autocare (Holdings) Limited | Financial services | 2020 |
| AV Automotive Ltd | Wholesale & retail | 2024 |
| Ayliz Limited | Wholesale & retail | 2026 |
| Aztec Consultants (GB) Limited | Professional & scientific | 2002 |
| Aztec Consultants (Holding) Limited | Professional & scientific | 2016 |
| B & B Building London Limited | Construction | 2017 |
| B & C Properties Essex Limited | Administrative & support | 2014 |
| B & MC Ltd | Construction | 2018 |
| B Groombridge and SON Limited | Construction | 2016 |
| B. Dawson Heating Services Limited | Construction | 2002 |
| B.M. Wanjiku Limited | Public administration | 2023 |
| B.S. Davison Limited | Construction | 2014 |
| B.V.S Group Limited | Wholesale & retail | 2017 |
| Baff Ltd | Wholesale & retail | 2025 |
| Barker Estates Limited | Real estate | 2021 |
| Barrie Elbourn Consultancy Limited | Construction | 2012 |
| Barry M Tools Limited | Administrative & support | 1999 |
| Basset Asset Ltd | Real estate | 2015 |
| Batak Ltd | Professional & scientific | 2022 |
| BATAK2 Ltd | Real estate | 2024 |
| Bats Subsidiary Ltd | Information & communication | 1985 |
| Bayore Limited | Health & social care | 2024 |
| Bconstruction Staffing Ltd | Administrative & support | 2025 |
| Beaches Home Care Ltd | Health & social care | 2025 |
| Beam of Hope Limited | Construction | 2024 |
| Beaming Brite Nursery Ltd | Health & social care | 2025 |
| Beauty by MJ Limited | Manufacturing | 2024 |
| Beckshay Consulting Limited | Professional & scientific | 2025 |
| Bedford Studios Ltd | Information & communication | 2022 |
| Beechcroft Freight Services Limited | Administrative & support | 2000 |
| Before and After Ltd | Arts & recreation | 2016 |
| BEL Produces Limited | Information & communication | 2022 |
| Bella Events Limited | Administrative & support | 2015 |
| Beneath Heat Limited | Extraterritorial | 2017 |
| Benjerry Limited | Health & social care | 2014 |
| Benson Properties Holdings Limited | Real estate | 2021 |
| Beny Prodrive Ltd | Transport & logistics | 2022 |
| Beta UFH Ltd | Wholesale & retail | 2021 |
| BFO Consultancy Services Ltd | Information & communication | 2020 |
| Bidii Property Investment Ltd | Real estate | 2021 |
| BL Boutique Ltd | Wholesale & retail | 2025 |
| Blackwell Homes Limited | Real estate | 2016 |
| Blanche Communications Ltd | Construction | 2009 |
| BLB Old Corringham Limited | Hospitality | 2025 |
| Bleau Holdings Ltd | Transport & logistics | 2025 |
| Blessed Family Group Ltd | Real estate | 2026 |
| Bloom & Decor Limited | Wholesale & retail | 2025 |
| Blooming Babies Day Nursery Ltd | Education | 2010 |
| Blooms Service Ltd | Real estate | 2026 |
| Blue Prestige Ltd | Construction | 2023 |
| Blue Prestige Services Ltd | Construction | 2026 |
| Blue Ridge Care Ltd | Health & social care | 2026 |
| BMC Landscapes Limited | Administrative & support | 2025 |
| BMH Property Services Limited | Households | 2021 |
| BOB Welding Limited | Construction | 2025 |
| Body Scrub and Facial Limited | Other services | 2025 |
| BOG Services Ltd | Transport & logistics | 2017 |
| Bogdan Elite Detailing Limited | Administrative & support | 2025 |
| Boluda Towage London Ltd. | Transport & logistics | 2015 |
| Bosh Supplies Limited | Wholesale & retail | 2020 |
| Box-It Central Limited | Administrative & support | 2012 |
| Box-It East Limited | Transport & logistics | 1985 |
| Box-It South East Ltd | Transport & logistics | 2010 |
| Brighton PIE and Mash Ltd | Hospitality | 2025 |
| Brightside Connect Limited | Information & communication | 2018 |
| Brightside Connect Utilities Limited | Energy | 2018 |
| Broad Range Consulting Ltd | Professional & scientific | 2023 |
| Broadleigh Homes Limited | Construction | 2023 |
| Broken Remains Events Ltd | Arts & recreation | 2025 |
| Brother Claret Ltd | Wholesale & retail | 2022 |
| Browns Landscaping and Garden Rooms Limited | Administrative & support | 2016 |
| BRV Carpentry Ltd | Construction | 2014 |
| BS Drawings Direct Ltd | Construction | 2003 |
| Btlltw Ltd | Transport & logistics | 2025 |
| Buckland Property Mgmt Ltd | Real estate | 2025 |
| Buckland Web Studio Ltd | Professional & scientific | 2025 |
| Bukkysonik Ltd | Health & social care | 2022 |
| Bumblebee Bookkeeping Limited | Professional & scientific | 2019 |
| Bunab Property Ltd | Real estate | 2022 |
| Burger Banditz Limited | Hospitality | 2026 |
| Business & Leaders Ltd | Information & communication | 2012 |
| Business Skills Development Ltd | Administrative & support | 2024 |
| Butch Electric Ltd | Construction | 2025 |
| BV Mechanical Limited | Construction | 2019 |
| BVS Holdings Ltd | Financial services | 2024 |
| C&D Building Services Ltd | Construction | 2025 |