| Anmventures Ltd | Information & communication | 2025 |
| Anna Nails Ltd | Other services | 2024 |
| Anthem Productions Limited | Information & communication | 2023 |
| Anthony Page Consultants Limited | Professional & scientific | 2018 |
| Anti Ordinary Ltd | Professional & scientific | 2021 |
| ANY Minute Productions Limited | Information & communication | 2018 |
| Anybody's Ghost Limited | Information & communication | 2020 |
| Anything WET Plumbing and Property Maintenance Limited | Construction | 2018 |
| AOJ Supplies Limited | Wholesale & retail | 2017 |
| AP Balancing Ltd | Manufacturing | 2023 |
| APA Pharma Ltd | Wholesale & retail | 2022 |
| Apache Leisure Ltd | Wholesale & retail | 2026 |
| Apache Nationwide Ltd | Wholesale & retail | 2023 |
| Apache Pods Ltd | Wholesale & retail | 2025 |
| Apache Trailers Ltd | Wholesale & retail | 2023 |
| APE Fleet Solutions Ltd | Wholesale & retail | 2026 |
| Apex Assurance Limited | Professional & scientific | 2021 |
| Apex Bricklayers Ltd | Construction | 2023 |
| Apex Designs & Products Limited | Manufacturing | 1997 |
| Apex Electrical Systems Ltd | Construction | 2017 |
| Apex Financial Consultancy Limited | Professional & scientific | 2025 |
| Apex Pressure Wash Limited | Construction | 2024 |
| Apex Prop Services Ltd | Construction | 2026 |
| Apex Property Nest Limited | Real estate | 2022 |
| Apex Roofing Systems Ltd | Construction | 2025 |
| Apex Scaffold Design Limited | Construction | 2011 |
| Apex Technology Solutions Limited | Wholesale & retail | 2026 |
| APJ Dairies Limited | Agriculture & fishing | 2018 |
| Apple Leaf Property Management Limited | Real estate | 2016 |
| Appletree Interiors Limited | Construction | 2012 |
| Applewood Independent Ltd | Financial services | 1998 |
| Appnitro Limited | Wholesale & retail | 2025 |
| Appnytro Limited | Wholesale & retail | 2025 |
| Appy Media Ltd | Information & communication | 2008 |
| APW Brickwork and Construction Ltd | Construction | 2020 |
| AQL Diagnostics Ltd | Health & social care | 2025 |
| Aqua International Landscapes Ltd | Administrative & support | 2016 |
| Aqua Jems Ltd. | Other services | 2014 |
| Aquapools Ltd | Information & communication | 2016 |
| Arbgear Ltd | Agriculture & fishing | 2019 |
| Arboc I.M.P Ltd | Construction | 2018 |
| Arc-Learn Limited | Professional & scientific | 2024 |
| Arcadia Trade Limited | Wholesale & retail | 2026 |
| Arcane Power & Controls Ltd | Construction | 2025 |
| Archer Electrical Services Limited | Construction | 2020 |
| Archer Incorporated Ltd | Arts & recreation | 2019 |
| Archer Yates Associates Limited | Hospitality | 1998 |
| Architectural Wallsz (International) Limited | Construction | 2014 |
| Arden Acquisition and Planning Ltd | Real estate | 2002 |
| Arden Greenhill Limited | Construction | 2020 |
| Arden Studio Business Solutions Limited | Professional & scientific | 2022 |
| Area Camden Limited | Administrative & support | 2012 |
| Arena Wealth (Golf) Limited | Professional & scientific | 2022 |
| Arena Wealth Financial Management (Golf) Limited | Professional & scientific | 2022 |
| Argo Installations Limited | Construction | 2026 |
| Arham T Traders Ltd | Wholesale & retail | 2025 |
| Arissian Ltd | Information & communication | 2014 |
| Arktos Group Holdings Ltd. | Wholesale & retail | 2023 |
| ARL Sales and Marketing Limited | Administrative & support | 2014 |
| Armada Training Solutions Ltd | Information & communication | 1997 |
| Armstrong Bell Limited | Information & communication | 2006 |
| Arnie Keith Limited | Arts & recreation | 2013 |
| Arnold & Charlton Investments Ltd | Real estate | 2024 |
| Arrowvend Limited | Hospitality | 1986 |
| Arsalan Deals Ltd | Wholesale & retail | 2025 |
| Artisan Carpentry and Renovations Ltd | Construction | 2026 |
| Artisan Holdings Ltd | Financial services | 2026 |
| Artycraft Ltd | Manufacturing | 2023 |
| AS Rail Consultancy Limited | Professional & scientific | 2020 |
| ASA BFB Ltd | Arts & recreation | 2010 |
| ASB Plumbing and Heating Limited | Construction | 2015 |
| ASC Electrical Installations Ltd | Manufacturing | 2016 |
| ASC Events and Catering Limited | Hospitality | 2026 |
| Ascott Houghton Ltd | Hospitality | 2016 |
| Ascotts of Bromsgrove Limited | Hospitality | 2004 |
| ASD Midlands Limited | Administrative & support | 2017 |
| ASH Magnetics Limited | Manufacturing | 2017 |
| Ashdell Ltd | Construction | 2018 |
| Ashfield Contracts Ltd | Construction | 2023 |
| Ashleigh Properties Limited | Real estate | 2005 |
| Ashley Ventures and Services Ltd | Wholesale & retail | 2019 |
| ASJ Real Estate Ltd | Real estate | 2020 |
| ASK Solihull Consulting Ltd | Health & social care | 2016 |
| ASM Dynamics Limited | Information & communication | 2018 |
| ASN Couriers Ltd | Transport & logistics | 2021 |
| Aspire Business Partnership LLP | | 2009 |
| Aspire Business Pship Ltd | Professional & scientific | 2017 |
| Aspire Property Associates Limited | Real estate | 2012 |
| Asplands Imports Limited | Wholesale & retail | 2026 |
| Asps Consulting Ltd | Professional & scientific | 2024 |
| Assetwrx Ltd | Administrative & support | 2010 |
| Associate Design Bureau Limited | Professional & scientific | 2025 |
| Associated Electrical Limited | Manufacturing | 2005 |
| Associated Electrical Properties Limited | Real estate | 2005 |
| Association for AI in Financial Services CIC | Information & communication | 2025 |
| Assured Accountancy Ltd | Professional & scientific | 2002 |
| Assured Air and Water Limited | Water & waste | 2012 |
| Astin Tech Solutions Ltd | Information & communication | 2025 |
| Aston Fields Social Club Limited | Arts & recreation | 2019 |
| Aston Peters Limited | Administrative & support | 2009 |