| Askesa Holdings Limited | Financial services | 2026 |
| ASM Cyber Ltd | Information & communication | 2018 |
| Aspects (Coventry) Limited | Administrative & support | 2004 |
| Aspects (Eastrea) Limited | Construction | 2023 |
| Aspects (Lutterworth) Limited | Construction | 2011 |
| Aspects Building Services (UK) Limited | Construction | 2012 |
| Aspects Building Services Limited | Construction | 2003 |
| Aspects Holdings (UK) Limited | Professional & scientific | 2002 |
| Aspects Homes (Midlands) Limited | Extraterritorial | 2001 |
| Aspects Services (UK) Limited | Professional & scientific | 2005 |
| Aspen Global Limited | Professional & scientific | 2018 |
| Aspens & Co Ltd | Professional & scientific | 2013 |
| Aspire Music Limited | Arts & recreation | 2024 |
| Aspire NOW Limited | Administrative & support | 2014 |
| Associated Life (UK) Limited | Professional & scientific | 2003 |
| Assured Asset Energy Limited | Manufacturing | 2012 |
| Assured Asset Management Limited | Administrative & support | 2011 |
| Assured CMS Limited | Professional & scientific | 2022 |
| Assynt Ltd | Professional & scientific | 2023 |
| Astonia Developments Limited | Real estate | 2018 |
| Astral IT Ltd | Administrative & support | 2022 |
| Astroe Limited | Manufacturing | 2014 |
| Astrolabe Initiatives Limited | Professional & scientific | 2012 |
| Astrow Automotive Limited | Professional & scientific | 2024 |
| Astute Business Support Ltd | Information & communication | 2026 |
| Astute Quantity Surveying Limited | Professional & scientific | 2014 |
| Asul Properties Ltd | Real estate | 2018 |
| AT Architects Limited | Professional & scientific | 2004 |
| AT Print Limited | Manufacturing | 2016 |
| Atamana Designs Ltd | Manufacturing | 2025 |
| Atlantean Enterprises Limited | Education | 2009 |
| Atlantic Associates Ltd | Professional & scientific | 2012 |
| Atlantic Energy Partners Ltd | Administrative & support | 2020 |
| Atlas Travels and Consultancy Ltd | Transport & logistics | 2026 |
| Atom Installations Limited | Construction | 2020 |
| Atrium Visuals Ltd | Professional & scientific | 2017 |
| Att&Co Ltd | Wholesale & retail | 2025 |
| Attack Creative Limited | Professional & scientific | 2016 |
| Attic Beams Ltd | Construction | 2023 |
| Atwal Estates Limited | Real estate | 2016 |
| Atwal Property Management Limited | Real estate | 2013 |
| Aubrey Boxing Ltd | Wholesale & retail | 2022 |
| Audan Consulting Limited | Professional & scientific | 2015 |
| Auden Marketing Ltd | Professional & scientific | 2020 |
| Augeo Consulting Ltd | Professional & scientific | 2018 |
| Augment Consulting Limited | Administrative & support | 2005 |
| Aujla Estates Ltd | Real estate | 2021 |
| Aura Care & Smile Ltd | Health & social care | 2026 |
| Aurelb Ltd | Professional & scientific | 2016 |
| Auriga Associates Limited | Professional & scientific | 1998 |
| Auriga Estates Limited | Administrative & support | 2016 |
| Aurora Dining Limited | Hospitality | 2025 |
| Aurrora Limited | Information & communication | 2018 |
| Authentically YOU Aesthetics Ltd | Other services | 2026 |
| Auto Clear Vision Windscreens Ltd | Wholesale & retail | 2011 |
| Auto Propulsion Limited | Professional & scientific | 2020 |
| Auto Screen FIX Ltd | Wholesale & retail | 2023 |
| Auto Stop Leamington Ltd | Wholesale & retail | 2004 |
| Auto Surveys Ltd | Information & communication | 2020 |
| Auto Surveys Traffic Limited | Financial services | 2025 |
| Auto Tirona Limited | Wholesale & retail | 2025 |
| Autocom Solutions Limited | Professional & scientific | 2024 |
| Automated Solutions Ltd | Professional & scientific | 2012 |
| Automotive Design Ltd | Construction | 2014 |
| Automotive Performance Parts Ltd | Wholesale & retail | 2024 |
| Automotive Simulation Limited | Professional & scientific | 2007 |
| Autostyle Limited | Wholesale & retail | 2012 |
| Autotech Warwick Limited | Wholesale & retail | 2008 |
| Autotecnico Ltd | Professional & scientific | 2023 |
| AVA Rose UK Properties Ltd | Real estate | 2024 |
| Avea Search Ltd | Administrative & support | 2025 |
| Avenue 22 Property Ltd | Construction | 2025 |
| Avenue GAS Services Ltd | Construction | 2025 |
| Avenue Properties (Warwickshire) Limited | Real estate | 2018 |
| Avenue Properties Management Ltd | Real estate | 2022 |
| Aver Ltd | Education | 2026 |
| Avern Consulting Limited | Professional & scientific | 2024 |
| Avery Events Ltd | Administrative & support | 2018 |
| Avianta Holdings Ltd | Financial services | 2018 |
| Avianta Pharma Limited | Professional & scientific | 2017 |
| AVK Trading Limited | Administrative & support | 2023 |
| Avon Construction (Midlands) Limited | Construction | 1998 |
| Avon Pest Control Ltd | Administrative & support | 2014 |
| Avonhurst Investment Brokers Limited | Financial services | 2000 |
| Avonmine Limited | Real estate | 1989 |
| Avonstream CGI Ltd | Professional & scientific | 2023 |
| Avventura Holdings Limited | Professional & scientific | 2021 |
| Avventura Travels Limited | Administrative & support | 2019 |
| AW Consulting Solutions Limited | Administrative & support | 2011 |
| Awcs Group Limited | Administrative & support | 2021 |
| Awcs Property Holdings Ltd | Real estate | 2019 |
| Awcs Solar Ltd | Manufacturing | 2021 |
| Awigia Limited | Administrative & support | 2010 |
| Awkward Sisters Ltd | Wholesale & retail | 2024 |
| Awlworks Limited | Manufacturing | 2019 |
| Axis J9 Management Company Limited | Households | 2019 |
| AY Management Ltd | Real estate | 2024 |
| Ayla Grill & Restaurant Ltd | Hospitality | 2021 |
| Ayleton Cleaning Limited | Administrative & support | 2003 |
| B & P Lettings Limited | Real estate | 2025 |