| Anchor Access Ltd | Construction | 2018 |
| AND Design (Bath) Limited | Professional & scientific | 2004 |
| AND Fish Bar Limited | Hospitality | 2024 |
| Andreea and ANA Logistics Ltd | Transport & logistics | 2023 |
| Andremi Property Ltd | Real estate | 2024 |
| Andrew Brownsword Hotels Limited | Professional & scientific | 2003 |
| Andrew Jamieson Associates Ltd | Arts & recreation | 2004 |
| Andrew Johnston Lighting Ltd | Manufacturing | 2011 |
| Andrew Kemp Cameras Limited | Professional & scientific | 2014 |
| Andrew M. Fletcher Limited | Professional & scientific | 2016 |
| Andrew Maisey Building Contractors Limited | Construction | 2016 |
| Andrew Mcbride Limited | Health & social care | 2019 |
| Andrew Parker Consulting Ltd | Professional & scientific | 2018 |
| Andrew Taberner Architects Ltd | Professional & scientific | 2025 |
| Andrew Wicks Ceramics Ltd | Manufacturing | 2020 |
| Andy Hayes Limited | Wholesale & retail | 2018 |
| Andy James Consulting Ltd | Information & communication | 2022 |
| Andy Jordan Productions Limited | Arts & recreation | 2001 |
| Andy Pemberton Ltd. | Information & communication | 2012 |
| Andy Wrintmore Memorials Ltd | Manufacturing | 2011 |
| Andy's Electrical (SW) Limited | Construction | 2014 |
| Angelo’S Bakery Ltd | Manufacturing | 2026 |
| Angharad Walker Ltd | Information & communication | 2016 |
| Anglo Gulf Energy Limited | Real estate | 1991 |
| Anglo Pallets Ltd | Manufacturing | 2024 |
| Anglo Welsh (Holdings) Limited | Professional & scientific | 2021 |
| Anglo Welsh Limited | Hospitality | 2000 |
| ANH Coaching Ltd | Health & social care | 2021 |
| Animl Ltd | Professional & scientific | 2011 |
| Anko Property Ltd | Real estate | 2024 |
| ANN and ISA Solutions Ltd | Health & social care | 2025 |
| ANN Tricklebank Limited | Information & communication | 2011 |
| Annabel Jackson Associates Limited | Administrative & support | 2009 |
| Annabel North - Personal Stylist Limited | Wholesale & retail | 2016 |
| Annagurra Limited | Wholesale & retail | 2020 |
| Anne LE COZ Ltd | Wholesale & retail | 2003 |
| Annette Merrick Associates Limited | Professional & scientific | 2013 |
| Annie Ellison Limited | Professional & scientific | 2019 |
| Another Feather Limited | Information & communication | 2019 |
| Anstey Roofing & Construction Limited | | 2011 |
| Antal Transport Ltd | Wholesale & retail | 2021 |
| Antcliff Partnership Ltd | Health & social care | 2016 |
| Anthem Publishing Holdings Limited | Financial services | 2024 |
| Anthem Publishing Limited | Information & communication | 2002 |
| Anthoni CT Partners Limited | Professional & scientific | 2020 |
| Anthony Hepworth Fine Art Dealers Limited | Wholesale & retail | 2004 |
| Anthos One Ltd | Other services | 2019 |
| Anthracite Partners Limited | Professional & scientific | 2023 |
| Antica Pulteney Bridge Ltd | Hospitality | 2017 |
| Antiqued Mirror Ltd. | Wholesale & retail | 2020 |
| Antony Mills Building Contractors Ltd | Construction | 2025 |
| Antony Whitaker Limited | Other services | 2006 |
| Anzisha Ltd | Professional & scientific | 2020 |
| Anzulou Limited | Information & communication | 2006 |
| AOK Properties Ltd | Real estate | 2018 |
| Apartment Lettings Limited | Real estate | 2022 |
| APC Construction (Bath) Ltd | Construction | 2025 |
| APC Flooring Ltd | Construction | 2024 |
| APC Property Limited | Construction | 2019 |
| APD North West Ltd | Health & social care | 2010 |
| APD Properties Limited | Real estate | 2012 |
| Apeiron Advisors Ltd. | Education | 2015 |
| Apex Alarms Limited | Administrative & support | 2007 |
| Aph.Media Ltd | Professional & scientific | 2026 |
| Apollo Fire Risk Assessment Ltd | Financial services | 2026 |
| Apopsi Consulting Limited | Professional & scientific | 2015 |
| Apotheke Perfume Ltd | Manufacturing | 2020 |
| Applegarth Organics Ltd | Health & social care | 2026 |
| Appleton Hardscape Ltd | Construction | 2022 |
| Appleyard Stores Ltd | Wholesale & retail | 2019 |
| Applied Alchemy Ltd | Professional & scientific | 2014 |
| Applied Cognition Ltd | Professional & scientific | 2012 |
| Apprise Experience Design Limited | Professional & scientific | 2013 |
| Apps International Limited | Professional & scientific | 2004 |
| Appy Daze Ltd. | Wholesale & retail | 2011 |
| APS Limes Ltd | Real estate | 2021 |
| APS Oakfield Ltd | Construction | 2021 |
| APS Qsquare Ltd | Real estate | 2022 |
| APS Stanton Ltd | Real estate | 2022 |
| Apys Subsea Ltd | Professional & scientific | 2018 |
| Aqua Consulting Limited | Professional & scientific | 2005 |
| Aqua MAX Plumbing, Heating & Electrical Limited | Construction | 1999 |
| Aqua Property Holdings Limited | Extraterritorial | 2018 |
| Aqua-Refining Limited | Administrative & support | 1984 |
| Aquae Sulis Dental Limited | Households | 2018 |
| Aquae Sulis Digital Limited | Professional & scientific | 2025 |
| Aquae Sulis Hospitality & Retail Ltd | Wholesale & retail | 2022 |
| Aquahr Ltd | Administrative & support | 2019 |
| Aquasafe Environmental Limited | Professional & scientific | 2015 |
| Arabco Ltd | Construction | 2026 |
| Arboreal Limited | Agriculture & fishing | 2024 |
| Arbortech Planting Products Limited | Manufacturing | 2020 |
| Arbre Chocolate Ltd | Manufacturing | 2020 |
| Arbre Food Holdings Limited | Hospitality | 2020 |
| ARC Labs Limited | Information & communication | 2025 |
| Archa Ltd | Wholesale & retail | 2026 |
| Archaeo-Heritage Film Limited | Information & communication | 2024 |
| Archangel Studios Limited | Information & communication | 2023 |
| Archerbrown Ltd | Professional & scientific | 2022 |
| Archers Marquees Ltd | Other services | 2010 |