| AWS (North East) Limited | Wholesale & retail | 2016 |
| Axcentuk Ltd | Wholesale & retail | 2021 |
| AXE Strategies Ltd | Professional & scientific | 2014 |
| Axem Holdings Limited | Financial services | 2019 |
| Axem Investments Limited | Real estate | 2019 |
| Axi-Tek Ltd | Manufacturing | 2012 |
| Axima FM Holding Limited | Extraterritorial | 1998 |
| Axima FM Limited | Extraterritorial | 1994 |
| Axiom AI for Good Ltd | Professional & scientific | 2026 |
| Axiom AI Group Ltd | Professional & scientific | 2026 |
| Axiom AI Insights Ltd | Information & communication | 2026 |
| Axiom AI Labs Ltd | Information & communication | 2026 |
| Axiom Origins Ltd | Information & communication | 2026 |
| Axiom Properties Ltd | Real estate | 2026 |
| Axisbiotix Limited | Wholesale & retail | 2019 |
| Axivity Ltd | Manufacturing | 2011 |
| Axomics Medical Ltd | Health & social care | 2025 |
| Axuro Wheels Ltd | Wholesale & retail | 2025 |
| Axwell Courtyard Management Limited | Real estate | 2014 |
| Axwell Decorating Services Ltd | Extraterritorial | 2015 |
| Axwell Gardens Management Company Limited | Real estate | 2007 |
| Axwell Power Ltd | Real estate | 2020 |
| AY Building Services Ltd | Construction | 2019 |
| AYA Afrique Ltd | Wholesale & retail | 2025 |
| AYA Nova Medical Ltd | Health & social care | 2026 |
| Ayah Property Ltd | Real estate | 2024 |
| Aycliffe Old Station Management Company Limited | Real estate | 2019 |
| Aydon Homes Limited | Construction | 2010 |
| Ayesh Tribe Limited | Wholesale & retail | 2025 |
| Ayeshas NE Ltd | Hospitality | 2025 |
| Ayiesha Ltd | Health & social care | 2022 |
| Ayinke World Limited | Wholesale & retail | 2025 |
| Aynik Properties Limited | Real estate | 2025 |
| Ayoob AI Ltd | Information & communication | 2024 |
| Ayoob Estates Ltd | Real estate | 2025 |
| AYS Motors Ltd | Wholesale & retail | 2025 |
| Aysgarth (East Hartford) Management Company Limited | Real estate | 2006 |
| Ayton Consultancy Ltd | Information & communication | 2022 |
| Ayton Park Managing Company Limited | Real estate | 2020 |
| Ayton Travel Ltd | Administrative & support | 2025 |
| Ayuda Agency Ltd | Professional & scientific | 2019 |
| AZ Car Wash Limited | Other services | 2019 |
| AZ Driving School Ltd | Education | 2022 |
| AZ Garrage Limited | Wholesale & retail | 2019 |
| AZ Safety Inspections Systems Limited | Construction | 2015 |
| AZ Services (NE) Ltd | Health & social care | 2020 |
| Azalea Inns Ltd | Hospitality | 2018 |
| Azalea Management Ltd | Hospitality | 2018 |
| Azbo Tuning Limited | Wholesale & retail | 2021 |
| Azets LA Holding Limited | Financial services | 2021 |
| Azets LA Limited | Financial services | 2002 |
| Azets Wealth Management Limited | Financial services | 2006 |
| AZH Enterprises Ltd | Wholesale & retail | 2025 |
| Azhz Ltd | Professional & scientific | 2025 |
| Aziza Risk Management Limited | Other services | 2022 |
| Azmah Ltd | Health & social care | 2018 |
| Azmah Properties Limited | Real estate | 2022 |
| Azman&Group Ltd | Hospitality | 2024 |
| Azores Group Ltd | Wholesale & retail | 2023 |
| Azrok Ltd | Administrative & support | 2020 |
| AZS Global Ltd | Wholesale & retail | 2024 |
| Aztron Trading Co Ltd | Wholesale & retail | 2024 |
| Azul Logistica Ltd | Transport & logistics | 2022 |
| Azula Properties Ltd | Real estate | 2020 |
| Azzabi Medical Limited | Health & social care | 2019 |
| Azzy Property Ltd | Households | 2025 |
| B & B Barberz Ltd | Other services | 2025 |
| B & C Trading Ltd | Wholesale & retail | 2015 |
| B & D Properties Management Limited | Real estate | 2026 |
| B & H Roofing & Cladding Contractors Limited | Construction | 2016 |
| B & I Estates Limited | Energy | 2013 |
| B & I Storage Ltd | Transport & logistics | 2016 |
| B & K Development Ltd | Real estate | 2016 |
| B & V Muers Ltd | Wholesale & retail | 2003 |
| B & W Property Limited | Real estate | 2017 |
| B and H Project Services Limited | Professional & scientific | 2018 |
| B and T Barbers Ltd | Other services | 2026 |
| B Connolly Bricklaying Ltd | Construction | 2023 |
| B Hawkes LLP | | 2012 |
| B LEE Groundworks Ltd | Construction | 2026 |
| B S D Contract Management Limited | Construction | 2010 |
| B&S Health Limited | Wholesale & retail | 2021 |
| B&S K (Angel 1) Ltd | Financial services | 2024 |
| B&S K (Cardiff) Ltd | Real estate | 2023 |
| B&S K (Investment 1) Ltd | Real estate | 2025 |
| B&S K (Lancashire) Ltd | Real estate | 2022 |
| B&S K (Sephora) Ltd | Real estate | 2024 |
| B&S K (Southampton) Ltd | Real estate | 2022 |
| B&S K (Sunderland) Ltd | Real estate | 2022 |
| B&S K (Topco) Ltd | Hospitality | 2015 |
| B&S K (Venture 1) Ltd | Real estate | 2023 |
| B&S K (Venture 2) Ltd | Real estate | 2023 |
| B&S K Ltd | Real estate | 2018 |
| B&W Traders Ltd | Wholesale & retail | 2025 |
| B-Advised Limited | Financial services | 2008 |
| B-Attentive Ltd | Health & social care | 2025 |
| B-Cot Ltd | Manufacturing | 2021 |
| B.A.M. Worldwide Ltd | Wholesale & retail | 2014 |
| B.D Wind Solution Limited | Manufacturing | 2025 |
| B.D.S. Motors Limited | Wholesale & retail | 2002 |