| AOA E&A Limited | Wholesale & retail | 2025 |
| AOL Consult Limited | Professional & scientific | 2019 |
| APA (NO.1) Limited | Real estate | 2015 |
| APA (NO.2) Limited | Real estate | 2015 |
| APA (NO.3) Limited | Real estate | 2015 |
| APC Solutions Ltd. | Manufacturing | 2012 |
| Aperio Financial Planners Limited | Financial services | 2025 |
| Apex Digital Holdings Ltd | Financial services | 2026 |
| Apis 3 Limited | Administrative & support | 2026 |
| APM Broadcast TEK Limited | Professional & scientific | 2009 |
| APM Mechanical Services Limited | Construction | 2024 |
| Apogee Holdings Limited | Financial services | 2018 |
| Apogee Wealth Holdings Ltd | Financial services | 2025 |
| Apogee Wealth Management Limited | Financial services | 2009 |
| Applaud Recruitment Limited | Administrative & support | 2007 |
| Applebey Beech Limited | Professional & scientific | 2006 |
| April's Kitchen Limited | Hospitality | 2017 |
| Aprilhunterboxing Ltd | Arts & recreation | 2022 |
| Aqua Clear Pools Ltd | Construction | 2012 |
| Arbie Holdings Ltd | Transport & logistics | 2020 |
| Arcc Construction Limited | Construction | 2015 |
| Architeknia Limited | Professional & scientific | 2025 |
| Ardale International Limited | Wholesale & retail | 1997 |
| Arithmostech Limited | Professional & scientific | 2016 |
| Arlson Psychological Services Limited | Health & social care | 2014 |
| Armstrong Consulting Ltd | Administrative & support | 2024 |
| Arromed Ltd | Professional & scientific | 2019 |
| Article 12 Ltd | Professional & scientific | 2024 |
| Artisan Landscaping Ltd | Administrative & support | 2025 |
| Artomy Limited | Extraterritorial | 2016 |
| AS 2019 Limited | Financial services | 2019 |
| Ascendancy Medical Writing Limited | Professional & scientific | 2010 |
| Ashbourne Portfolio Limited | Hospitality | 2025 |
| Ashdown Travel Limited | Financial services | 1985 |
| Ashmeadow House Management Company Limited | Households | 2020 |
| Asian Artisan Drinks Limited | Wholesale & retail | 2019 |
| ASK Aneka Ltd | Information & communication | 2026 |
| ASK Food Manufacturers Limited | Wholesale & retail | 2025 |
| ASP Futures Limited | Financial services | 2021 |
| Assetlion Limited | Financial services | 2026 |
| ASSETS4CHANGE Community Interest Company | Other services | 2024 |
| Astley Close Residents Company Limited | Administrative & support | 1999 |
| Astute Pharma Associates Limited | Professional & scientific | 2017 |
| Atburrows Ltd | Professional & scientific | 2023 |
| Atel Design and Build Limited | Real estate | 2014 |
| Atel Group Ltd | Real estate | 2019 |
| Atherton Finance Supply Ltd | Construction | 2025 |
| ATK Apparel Limited | Wholesale & retail | 2024 |
| Atlantic Images Ltd | Professional & scientific | 2015 |
| Attic Room Interiors Ltd | Wholesale & retail | 2022 |
| Auden House Care Limited | Health & social care | 2011 |
| Audit App Ltd | Information & communication | 2026 |
| Audit AR Ltd | Professional & scientific | 2026 |
| Audit ID Ltd | Professional & scientific | 2016 |
| Auditabl Ltd | Professional & scientific | 2022 |
| August Jaeger Ltd | Information & communication | 2023 |
| Aura 99 Limited | Information & communication | 2006 |
| Auskop Group Ltd | Financial services | 2022 |
| Auskop Investments Ltd | Real estate | 2022 |
| Auskop Ltd | Real estate | 2016 |
| Austin Powers Ltd | Professional & scientific | 2023 |
| Autolec Service (Company (M/C) Limited | | 1960 |
| Automated Systems Limited | Administrative & support | 1995 |
| Automated Technology Group Holdings Limited | Professional & scientific | 2011 |
| Autoperform Ltd | Wholesale & retail | 2002 |
| Auxesia Homes Limited | Real estate | 2010 |
| Auxesia Topco Limited | Financial services | 2021 |
| Avalon Design and Build Limited | Construction | 2020 |
| Avant Garde AV Ltd | Professional & scientific | 1992 |
| Avioventura Limited | Transport & logistics | 1998 |
| AW Sustainability Ltd | Professional & scientific | 2013 |
| Ayla Sleep Ltd | Wholesale & retail | 2026 |
| B & R Whittaker Ltd | Wholesale & retail | 2021 |
| B C D Carpets Limited | Wholesale & retail | 2017 |
| B34 Creative Limited | Other services | 2019 |
| Ba&As Limited | Information & communication | 2024 |
| Babylon Knutsford Limited | Hospitality | 2023 |
| Badger & Peacock Ltd | Hospitality | 2025 |
| Bailey Banks & Bond Limited | Real estate | 2019 |
| Baker Street Brands Limited | Professional & scientific | 2017 |
| Baker Street Holdings Limited | Financial services | 2017 |
| Balanced Property Investments Limited | Real estate | 2016 |
| Balfour Homes (Timperley) Limited | Professional & scientific | 2005 |
| Banstar International Limited | Professional & scientific | 2008 |
| Bar SIX Knutsford Limited | Hospitality | 2024 |
| Barclay Spencer Ltd | Other services | 2025 |
| Barkode Limited | Hospitality | 2021 |
| Barleyfields Accountancy Limited | Professional & scientific | 2024 |
| Barlow Productions Limited | Arts & recreation | 2015 |
| Barnshaw Smithy Cafe Limited | Hospitality | 2018 |
| BAS Promotions Limited | Administrative & support | 2013 |
| Base Pads Limited | Real estate | 2009 |
| Bathroom & Home Renovations Limited | Construction | 2020 |
| Batsford Property Co. Ltd | Real estate | 2022 |
| Battersea Bangor Limited | Hospitality | 2022 |
| Battlefield Live Knutsford Ltd | Arts & recreation | 2010 |
| BAX Bees LLP | | 2014 |
| BAX Marketing Limited | Real estate | 1997 |
| BAX Solutions Limited | Professional & scientific | 2023 |
| BBM Bar Ltd | Wholesale & retail | 2022 |