| Austen Miller Homes Ltd | Real estate | 2023 |
| Autism Creative Projects Limited | Information & communication | 2026 |
| Auto Breakers Limited | Professional & scientific | 2011 |
| Auto Zone Champions Ltd | Wholesale & retail | 2023 |
| Autobarn Ltd | Wholesale & retail | 2024 |
| Autoglint UK Ltd | Administrative & support | 2021 |
| Automated Machinery Services Ltd | Manufacturing | 2020 |
| Autonomy Hair Ltd | Other services | 2022 |
| Autopack Group Ltd | Financial services | 2025 |
| Autopack Holdings Ltd | Financial services | 2020 |
| Autopack Holdings Spain Ltd | Financial services | 2024 |
| Autopack Limited | Wholesale & retail | 2012 |
| Autopack Rental Ltd | Administrative & support | 2021 |
| Autopak Machinery Limited | Manufacturing | 2002 |
| Autoweigh Ltd | Manufacturing | 2026 |
| Autoweigh Scales Ltd | Extraterritorial | 2026 |
| Available on Demand Ltd | Real estate | 2012 |
| Avandna Consulting Ltd | Professional & scientific | 2012 |
| Avenbury Limited | Wholesale & retail | 2019 |
| Avenbury Property Ltd | Real estate | 2024 |
| Avenue Landscapes Limited | Administrative & support | 2006 |
| Avercliff Limited | Wholesale & retail | 1982 |
| Avert Risk International Ltd | Hospitality | 2007 |
| Avia Limited | Professional & scientific | 1994 |
| Avian Management Services Limited | Professional & scientific | 2015 |
| Avid Ventures Housing Ltd | Households | 2024 |
| Avilly Partners Limited | Real estate | 2026 |
| Avon Logistics Ltd | Transport & logistics | 2010 |
| Avonacre Limited | Professional & scientific | 2003 |
| Avondale Rise Ltd | Real estate | 2021 |
| Avtok Global Ltd | Administrative & support | 2025 |
| Avworx Limited | Information & communication | 2016 |
| Aware Ecology Ltd | Professional & scientific | 2022 |
| Away With the Circus Ltd | Information & communication | 2019 |
| AWG Security Limited | Administrative & support | 2011 |
| AXE Meister Guitars Ltd | Manufacturing | 2025 |
| Axis Industries Ltd | Manufacturing | 2022 |
| Axon Perform Limited | Information & communication | 2025 |
| Aylestone Accomodation & Events Ltd | Hospitality | 2024 |
| Aylestone Court Ltd | Hospitality | 2008 |
| Azona Design Ltd | Professional & scientific | 2020 |
| Azona Group Limited | Financial services | 2025 |
| Azona Property Limited | Real estate | 2020 |
| Aztec Electrical Services Ltd | Construction | 2007 |
| Azur Productions Limited | Extraterritorial | 2007 |
| Azura Building & Development Ltd | Construction | 2023 |
| B a Williams Carpentry Ltd | Construction | 2023 |
| B C Amos & SON Limited | Agriculture & fishing | 2011 |
| B Complete Property Management Limited | Real estate | 2022 |
| B E G Enterprises Ltd | Construction | 2010 |
| B E T Corbett Limited | Professional & scientific | 2013 |
| B Pearson Developments Ltd | Construction | 2015 |
| B Street Digital Limited | Information & communication | 2017 |
| B W Upton & Sons Limited | Agriculture & fishing | 2011 |
| B&O Capital Limited | Real estate | 2016 |
| B. Pearson Associates Ltd | Professional & scientific | 2006 |
| B. While and N. Charlwood Limited | Health & social care | 2016 |
| B.C. Havard Ltd | Hospitality | 2009 |
| B.C. Watkins Car Services Ltd | Wholesale & retail | 2013 |
| B.E.S Consultants Ltd | Information & communication | 2022 |
| B.Matter Ltd | Professional & scientific | 2025 |
| B.Y. Electrical Services Limited | Construction | 2004 |
| B3 Developments (Hereford) Ltd | Construction | 2022 |
| B5 Property Ltd | Real estate | 2022 |
| Baby Art Studios (Bedfordshire) Limited | Professional & scientific | 2020 |
| Baby Art Studios (Greenwich) Limited | Professional & scientific | 2026 |
| Baby Grays Limited | Wholesale & retail | 2024 |
| Babylon Festivals Ltd | Arts & recreation | 2012 |
| Babylon Hereford Limited | Hospitality | 2025 |
| Bachawy Limited | Administrative & support | 2015 |
| Back in Shape Clinic Limited | Extraterritorial | 2023 |
| Back in Shape Program Limited | Other services | 2020 |
| Back in Shape Studio Limited | Extraterritorial | 2023 |
| Bactotech UK Limited | Other services | 2025 |
| Bactria Ltd | Hospitality | 2023 |
| Baggallay Street Management Company Limited | Real estate | 2007 |
| Bailey Product Management Ltd | Information & communication | 2021 |
| Bailey Transport Solutions Ltd | Transport & logistics | 2026 |
| Baillie Homes Limited | Construction | 2007 |
| Baka Baked Goods Ltd | Wholesale & retail | 2026 |
| Balance Barns Management Company Ltd. | Households | 2006 |
| Ballingham Court Limited | Energy | 2015 |
| Ballingham Enterprises Limited | Extraterritorial | 2014 |
| Ballingham Hall Limited | Agriculture & fishing | 1994 |
| Ballingham Hall Subco Limited | Extraterritorial | 2022 |
| Ballisai Kaing Ltd | Real estate | 2019 |
| Baltia Limited | Wholesale & retail | 2026 |
| Baltic Flagstones Ltd | Wholesale & retail | 2026 |
| Baltic Retail Ltd Limited | Wholesale & retail | 2026 |
| Bamap Services Limited | Manufacturing | 2011 |
| Bankview Property Management Limited | Real estate | 2007 |
| BAP Joseph Properties Ltd | Construction | 2018 |
| Barbella Group Ltd | Administrative & support | 2025 |
| Bariggs Properties Limited | Real estate | 2017 |
| Barking Barbers Hereford Ltd | Other services | 2024 |
| Barkstone Estates Limited | Other services | 2025 |
| Barnett Racket Sports Ltd | Arts & recreation | 2013 |
| Barns Hogan Limited | Administrative & support | 2011 |
| Barodel Limited | Households | 1982 |
| Baroness Bakery Ltd | Manufacturing | 2021 |