| Apollo Accident Repair Group Limited | Wholesale & retail | 1997 |
| Apollo Motor Company (Bexhill) Limited | Wholesale & retail | 2009 |
| Apollo Motor Company (Bournemouth) Limited | Wholesale & retail | 2000 |
| Apollo Motor Company (Cheltenham) Limited | Wholesale & retail | 2014 |
| Apollo Motor Company (Dover) Limited | Wholesale & retail | 2014 |
| Apollo Motor Company (Horsham) Limited | Wholesale & retail | 2011 |
| Apollo Motor Company (Salisbury) Limited | Wholesale & retail | 2016 |
| Apollo Motor Company (Sittingbourne) Limited | Wholesale & retail | 2016 |
| Apollo Motor Company (Swindon) Limited | Wholesale & retail | 2016 |
| Apollo Motor Company (Tonbridge) Limited | Wholesale & retail | 2006 |
| Apollo Motor Company (Westbury) Limited | Wholesale & retail | 2016 |
| Apollo Motor Company (Yeovil) Limited | Wholesale & retail | 2004 |
| Apollo Motor Group Limited | Professional & scientific | 2006 |
| Applied Behaviour Systems Ltd | Information & communication | 2018 |
| Applied Business Techniques Ltd | Wholesale & retail | 2005 |
| Applied Thoughts Ltd. | Manufacturing | 1999 |
| Aprilmia Limited | Real estate | 2003 |
| Aqua Assets Limited | Administrative & support | 2015 |
| Aqua Cleansing Limited | Administrative & support | 2002 |
| Aqua PV Ltd | Construction | 2022 |
| Aqua Terra Marine Limited | Extraterritorial | 2013 |
| Aquabio Limited | Professional & scientific | 1997 |
| Aquamarine ( UK ) Ltd | Administrative & support | 2016 |
| Aquamarine Asset Management Ltd | Professional & scientific | 2023 |
| Aquantas Limited | Wholesale & retail | 2015 |
| Aquascope Solutions Ltd | Information & communication | 2021 |
| Aquatay Ltd | Administrative & support | 2006 |
| Aquest Private Ltd | Wholesale & retail | 2026 |
| AR & I Properties Ltd | Real estate | 2025 |
| Ar-Razaq UK Ltd | Hospitality | 2024 |
| Aramos Barber Ltd | Other services | 2025 |
| Arber Building Services Ltd | Construction | 2020 |
| ARC Building & Maintenance Ltd | Construction | 2021 |
| ARC Surveyors Limited | Professional & scientific | 2011 |
| Arce Cyber Limited | Information & communication | 2025 |
| Arch Side Leisure Limited | Arts & recreation | 2025 |
| Archen Consultancy Limited | Wholesale & retail | 2025 |
| Archer & Cunningham Limited | Real estate | 2006 |
| Arches Espresso Ltd. | Hospitality | 2017 |
| Archie Stevens Limited | Construction | 2019 |
| Arctic Air Solutions Ltd | Administrative & support | 2016 |
| Arctic Apple Limited | Professional & scientific | 2007 |
| Arden Road Management Company (Worcester) Limited | Households | 2017 |
| Arete Signature Ltd | Professional & scientific | 2026 |
| Arete Wellbeing Ltd | Administrative & support | 2023 |
| Argentar Holdings Limited | Financial services | 2018 |
| Argentar Ltd | Financial services | 2016 |
| Argyle Canopies Ltd | Professional & scientific | 2018 |
| ARK Life Ltd | Professional & scientific | 2020 |
| Arlique Ltd | Administrative & support | 2020 |
| Arma Events Consulting Ltd | Arts & recreation | 2016 |
| Armj Ltd | Professional & scientific | 2025 |
| Armstrongs of Worcester Limited | Wholesale & retail | 1958 |
| Arnatt Leisure Limited | Real estate | 2025 |
| Arnatt Property Limited | Real estate | 2025 |
| ARP Environmental Limited | Administrative & support | 2016 |
| Arqentis Limited | Administrative & support | 2026 |
| Arran Services Ltd | Construction | 2025 |
| Arrange My Group Ltd | Extraterritorial | 2015 |
| Art by Day Limited | Manufacturing | 2025 |
| Artanna Ltd | Wholesale & retail | 2024 |
| Artefii Limited | Professional & scientific | 2011 |
| Arthur Dayne Ltd | Hospitality | 2023 |
| Artichokethemovie Limited | Information & communication | 2018 |
| Artis Accident Care Limited | Wholesale & retail | 2017 |
| Artisan Water Treatment Limited | Water & waste | 2005 |
| Artists Clubhouse Community Interest Company | Other services | 2021 |
| Artiv Limited | Professional & scientific | 2020 |
| Artorri Limited | Hospitality | 2011 |
| Arts & Crafts Fairs Limited | Extraterritorial | 2001 |
| Arts Enterprises Worcester Ltd | Wholesale & retail | 1993 |
| Artworks Clothing Ltd | Manufacturing | 2021 |
| Arty Farky Ltd | Extraterritorial | 2020 |
| Arveth Ltd | Professional & scientific | 2021 |
| ARW Telecoms Ltd | Information & communication | 2023 |
| Arwen Communications Ltd | Professional & scientific | 2023 |
| Asap Property Maintenance and Home Improvements Limited | Administrative & support | 2005 |
| Asar Property Investments Ltd | Real estate | 2020 |
| ASB Lettings Limited | Real estate | 2019 |
| Asbc Limited | Professional & scientific | 2011 |
| Ascan Building Limited | Construction | 2005 |
| ASF (Assist First) Recruitment Ltd | Administrative & support | 2020 |
| ASH Constructive Roofing Limited | Construction | 2024 |
| ASH Mason Driver Hire Limited | Transport & logistics | 2017 |
| Ashey Developers (Ryde) Ltd | Construction | 2024 |
| Ashley Contract Supplies Ltd | Wholesale & retail | 2009 |
| Ashlu Limited | Professional & scientific | 2012 |
| Ashwood Construction (Worcester) Limited | Construction | 2022 |
| Ashwood Joinery Limited | Manufacturing | 2013 |
| Asipu Ltd | Health & social care | 2025 |
| ASK (Greenwich) Limited | Health & social care | 2002 |
| ASK (Holdings) Limited | Professional & scientific | 2002 |
| ASK Regulus Limited | Information & communication | 2025 |
| ASK TIM Plumbing Limited | Construction | 2024 |
| Aspects of Entertainment Limited | Wholesale & retail | 2021 |
| Aspen Resources (Worcester) Ltd | Other services | 2015 |
| Aspenify UK Limited | Information & communication | 2019 |
| Aspie Limited | Health & social care | 2011 |
| Aspire Trades Limited | Construction | 2024 |
| Asquith Development Ltd. | Real estate | 2016 |