| Araemo Limited | Real estate | 2016 |
| Aran Vale Products Limited | Agriculture & fishing | 2008 |
| Arba Hereford Ltd | Hospitality | 2016 |
| Arbon House & Co Limited | Administrative & support | 2025 |
| Arbor Architects Ltd | Professional & scientific | 2019 |
| Arbury Property Ltd | Real estate | 2024 |
| ARC Home Freeholds Ltd | Households | 2024 |
| ARC Home Investments Ltd | Real estate | 2018 |
| Archaeological Investigations Limited | Extraterritorial | 2019 |
| Archenfield Enterprises Limited | Health & social care | 2009 |
| Archibald Hotel Collection Ltd | Extraterritorial | 2025 |
| Archibald Marckay Commercial Ltd | Hospitality | 2019 |
| Archibald Marckay Group Ltd | Financial services | 2018 |
| Archibald Marckay Property Limited | Real estate | 2014 |
| Archibald Marckay Rental LLP | | 2017 |
| Architype Employee Ownership Trustees Limited | Professional & scientific | 2021 |
| Architype Limited | Professional & scientific | 2003 |
| Arcturus Transport Consulting Ltd | Professional & scientific | 2026 |
| Arden Court Estate Management Co. (Hereford) Limited | Households | 1977 |
| Area 1-51 Limited | Wholesale & retail | 2025 |
| Arena Lettings Limited | Real estate | 2009 |
| Arete Exploration Limited | Administrative & support | 2017 |
| Arew Limited | Real estate | 2004 |
| Arfa Elite Services Ltd | Administrative & support | 2025 |
| Arfr & Associates Limited | Real estate | 2015 |
| Argent Computing Limited | Information & communication | 2007 |
| Argomax Security Ltd | Administrative & support | 2025 |
| Argon Effects Ltd | Information & communication | 2005 |
| Argyle Corporations Ltd | Wholesale & retail | 2024 |
| ARH Media Ltd | Professional & scientific | 2020 |
| ARH Quantity Surveying Ltd | Professional & scientific | 2012 |
| Ariconium International Limited | Wholesale & retail | 2016 |
| ARK Aviation Limited | Transport & logistics | 2019 |
| ARK Solutions Limited | Manufacturing | 2023 |
| Arkstone Court Limited | Agriculture & fishing | 2013 |
| Armatus Vehicle Specialists Ltd | Wholesale & retail | 2025 |
| Armoury Coaching Systems Ltd | Arts & recreation | 2024 |
| Armstrong and Jones Community Support Ltd | Health & social care | 2017 |
| Arnold Capital Limited | Financial services | 2014 |
| Arnold Industrial Engineering Limited | Manufacturing | 2010 |
| Arnold Real Estate Limited | Real estate | 2014 |
| Arnold Retreats Limited | Hospitality | 2025 |
| Arphaxad Limited | Financial services | 2020 |
| Arrow Masonic Hall Co. Ltd. | Real estate | 1993 |
| Arrow Medical Limited | Manufacturing | 1989 |
| Arrow Valley Automation Limited | Administrative & support | 1993 |
| Art 4 Veterans Herefordshire CIC | Arts & recreation | 2021 |
| Art Hospitality Group Limited | Information & communication | 2018 |
| Arthur Oakley Transport Limited | Wholesale & retail | 1976 |
| Arthx Limited | Wholesale & retail | 2024 |
| Artistry Media Ltd | Manufacturing | 2024 |
| Artizan Creations Limited | Manufacturing | 2009 |
| Artorius Limited | Financial services | 2024 |
| Aruka PTE Ltd | Real estate | 2021 |
| Arundel Court Management Limited | Households | 1994 |
| AS3 Limited | Professional & scientific | 2002 |
| Ascalon Design Limited | Wholesale & retail | 1999 |
| Asclepia Ltd | Health & social care | 2024 |
| ASH FMC Limited | Financial services | 1998 |
| ASH2CARE Limited | Health & social care | 2022 |
| Ashburton Management Limited | Households | 2006 |
| Ashcroft Electrics Limited | Construction | 2017 |
| Ashfield Civils Limited | Construction | 2019 |
| Ashfield House Apartment Management Limited | Real estate | 2000 |
| Ashford Residents Company Limited | Real estate | 1989 |
| Ashley Court (Hereford) Management Limited | Households | 2008 |
| Asian Grocery Hub Limited | Wholesale & retail | 2023 |
| Aspire Building Co (HFD) Ltd | Construction | 2021 |
| Aspire Building Contractors LLP | | 2019 |
| Aspire Developments (HFD) Ltd | Construction | 2021 |
| Aspire Interim Management Limited | Professional & scientific | 2017 |
| Aspire Wise Futures Limited | Professional & scientific | 2023 |
| Aston House Care Ltd | Health & social care | 2020 |
| Astro Publishing Limited | Wholesale & retail | 2019 |
| Astute Entity Limited | Financial services | 2025 |
| Astute Graphics Limited | Information & communication | 2008 |
| AT 8 Ltd | Financial services | 2018 |
| Athelstone Limited | Real estate | 2017 |
| Atkinson Building & Carpentry Ltd | Manufacturing | 2023 |
| Atlantic Consultancy & Training Ltd | Professional & scientific | 2015 |
| Atlantic Finance Limited | Professional & scientific | 2024 |
| Atlantic Fish & Kebab Bar Ltd | Hospitality | 2010 |
| Atlantic Medical Ltd | Health & social care | 2023 |
| Atlantic Properties (Hereford) Limited | Real estate | 2026 |
| ATN Europe Limited | Manufacturing | 2015 |
| Atomic Bull Limited | Wholesale & retail | 2024 |
| Aubin Rural Ltd | Agriculture & fishing | 2023 |
| Aubrey Property Ltd | Real estate | 2021 |
| Aubrey Smith Ltd | Professional & scientific | 2024 |
| Auction Sale Finder Limited | Information & communication | 2014 |
| Audiotent Ltd | Information & communication | 2013 |
| Audley Christie Limited | Professional & scientific | 2023 |
| Augmented Instincts Ltd | Administrative & support | 2021 |
| August Views Ltd | Real estate | 2019 |
| AUI Ltd | Construction | 2020 |
| Aultridia Ltd | Financial services | 2018 |
| AUR Trans Ltd | Transport & logistics | 2020 |
| Aurora Isaac Limited | Information & communication | 2025 |
| Aurum Luxury Residencies Ltd | Hospitality | 2021 |
| Austen Miller Bloodstock Ltd | Other services | 2025 |