| AJL Finance Limited | Financial services | 2019 |
| AJM Media Limited | Arts & recreation | 2014 |
| AJM Real Estate Limited | Real estate | 2016 |
| AJR Technical Services Ltd | Professional & scientific | 2024 |
| AJS Diffusion Services Ltd | Manufacturing | 2022 |
| AJS Events Management Ltd | Other services | 2023 |
| AJS SAW Mill Limited | Administrative & support | 2020 |
| AK Joinery and Construction Limited | Construction | 2022 |
| Akerboom Makers Ltd | Professional & scientific | 2023 |
| Akesson Cawp Limited | Administrative & support | 2019 |
| Akfd Ltd | Real estate | 2026 |
| AKP Installations Ltd | Energy | 2019 |
| Akronis Limited | Wholesale & retail | 2022 |
| AKS Accountants (North West) Ltd | Professional & scientific | 2021 |
| AKS Mechanical Designs Limited | Manufacturing | 2017 |
| Aksaray Kebab Limited | Hospitality | 2026 |
| AL Air Aviation Limited | Manufacturing | 1995 |
| AL FLO Chester Limited | Wholesale & retail | 2023 |
| AL Hariri Ltd | Transport & logistics | 2025 |
| Al-Hasani Group Limited | Real estate | 2021 |
| Alaa Hilles Limited | Health & social care | 2016 |
| Alan Evans Projects Ltd | Construction | 2026 |
| Alan Jefford Ltd | Administrative & support | 2013 |
| Alan Pickup Limited | Wholesale & retail | 2003 |
| Alangwyn Limited | Real estate | 1974 |
| Alary Limited | Administrative & support | 2004 |
| ALB Financial Limited | Administrative & support | 2019 |
| Albaraka Chester Ltd | Wholesale & retail | 2020 |
| Albco Holdings Ltd | Construction | 2024 |
| Albert Steins Limited | Manufacturing | 2022 |
| Albie Clothes Ltd | Wholesale & retail | 2025 |
| Albion Mews (Chester) Limited | Households | 2011 |
| Albu Costin Ltd | Transport & logistics | 2019 |
| Albus Elmes Limited | Information & communication | 2019 |
| Alcj Properties Limited | Households | 2016 |
| Alcofrë Ltd | Wholesale & retail | 2024 |
| Aldelyme Ltd | Information & communication | 2012 |
| Aldercross Limited | Real estate | 2003 |
| Alderley Edge Land Holdings Ltd | Real estate | 2026 |
| Aldersey Oaks Residents Management Company Limited | Households | 2020 |
| Aldersey Park Management Company Limited | Households | 1990 |
| Aldford Apparel Limited | Other services | 2014 |
| Aldford Village Store Limited | Wholesale & retail | 2017 |
| Aldgate Triangle Resident Management Company Limited | Households | 2023 |
| Aldwych Marine Holdings Ltd | Financial services | 2007 |
| Alenik Advanced Dentistry Ltd | Administrative & support | 2017 |
| Alex 2010 Limited | Transport & logistics | 2016 |
| Alex Mcgregor Costumes Limited | Arts & recreation | 2018 |
| Alex Widdowson Limited | Wholesale & retail | 2018 |
| Alexander Bruce Estates Limited | Construction | 2005 |
| Alexander Bruce Limited | Real estate | 1997 |
| Alexander Fitzpatrick Ltd | Manufacturing | 2006 |
| Alexander's Live Limited | Hospitality | 2015 |
| Alexandra Hall Halifax Ltd | Arts & recreation | 2025 |
| Alexandra Mews (Handbridge) Limited | Households | 2020 |
| Alexia L MAY Limited | Professional & scientific | 2022 |
| Alexium Limited | Professional & scientific | 2012 |
| Alford Estates Ltd | Real estate | 2019 |
| Alice Jennings Fitness Ltd | Arts & recreation | 2020 |
| Aligator Consultancy Ltd | Wholesale & retail | 2018 |
| Align & Restore Osteopathy Ltd | Health & social care | 2024 |
| Alignpath Consulting Limited | Other services | 2025 |
| Alimel North West Limited | Arts & recreation | 2015 |
| Alin Eric Ltd | Transport & logistics | 2020 |
| Alisha Heap Make-Up Limited | Other services | 2018 |
| Alison Hastings Media Limited | Administrative & support | 2005 |
| Alkemi M.F. Technologies Limited | Manufacturing | 1992 |
| ALL Nations Braiding & Beauty Ltd | Other services | 2020 |
| ALL Offshore Limited | Extraterritorial | 2013 |
| ALL Road Training LLP | | 2022 |
| ALL Round Holdings Limited | Other services | 2021 |
| ALL the Right Notes Limited | Professional & scientific | 2021 |
| ALL Things Property Services Ltd | Construction | 2019 |
| ALL Well and Good Ltd | Health & social care | 2024 |
| Allen Road Ltd | Real estate | 2026 |
| Alliance Advisors UK Limited | Administrative & support | 2022 |
| Alliance Chauffeurs Ltd | Transport & logistics | 2020 |
| Allinson Commercial Property Limited | Real estate | 2021 |
| Allinson Residential Property Limited | Real estate | 2021 |
| Allman Management Limited | Extraterritorial | 1991 |
| Allsell Trading Limited | Wholesale & retail | 1994 |
| Allsquare Building Contractors Limited | Construction | 2003 |
| Allstar Investors Limited | Financial services | 2019 |
| Allure 17 Limited | Wholesale & retail | 2010 |
| Allure Properties (UK) Ltd | Real estate | 2015 |
| Allure Retail Ltd | Wholesale & retail | 2022 |
| Almaviva Limited | Real estate | 2003 |
| ALO Solutions Limited | Professional & scientific | 2014 |
| Alpha Airsource Ltd | Construction | 2023 |
| Alpha Duck Ltd | Wholesale & retail | 2019 |
| Alpha Income LLP | | 2019 |
| Alpha Investment Solutions Limited | Real estate | 2025 |
| ALPHACARE4U UK Ltd | Health & social care | 2019 |
| Alphacath Ltd. | Professional & scientific | 2014 |
| Alphastor Limited | Construction | 2020 |
| Alphastor Warehouse Systems Ltd | Construction | 2024 |
| ALS Freelance Ltd | Professional & scientific | 2021 |
| Altair Aero Ltd | Professional & scientific | 2025 |
| Altara Containers Ltd | Manufacturing | 2025 |
| Altex Secure Limited | Administrative & support | 2024 |