| Alliant Audio Ltd | Information & communication | 2019 |
| Allied Asset Finance Limited | Financial services | 2003 |
| Amelia Arthur Estates Ltd | Real estate | 2025 |
| American Nails BA3 Ltd | Other services | 2026 |
| Amethyst Holidays Ltd | Hospitality | 2023 |
| Ammerdown Beef Unit Ltd | Agriculture & fishing | 2026 |
| Ammerdown Shoot Ltd | Arts & recreation | 2021 |
| Amped UP Ltd | Manufacturing | 2020 |
| AMY Fukuyama Cleaning Services Limited | Administrative & support | 2021 |
| Anderton Johnson Limited | Real estate | 2025 |
| Andrew Eyles Catering Limited | Hospitality | 2018 |
| Andy Nicholas Limited | Information & communication | 2003 |
| Andybus & Coach Limited | Transport & logistics | 2003 |
| Anthony China Limited | Health & social care | 2014 |
| Anytax Bristol Limited | Professional & scientific | 2025 |
| Apex Strategic Limited | Professional & scientific | 2020 |
| Apex Ventures Limited | Wholesale & retail | 1995 |
| Apollo Investment Properties Limited | Real estate | 2018 |
| Apollo Technology Solutions Limited | Information & communication | 2010 |
| Apple Tree Inns Ltd | Hospitality | 2008 |
| Aqua Management Limited | Construction | 1991 |
| Aquae Sulis EAR Care Clinic Ltd | Health & social care | 2025 |
| Aquae Sulis Trading Ltd | Wholesale & retail | 2019 |
| Aquatech (SW) Ltd | Construction | 2021 |
| Arberi Limited | Agriculture & fishing | 2022 |
| ARC Mailing Limited | Manufacturing | 2008 |
| Archer Watkins Limited | Professional & scientific | 2024 |
| Argentum Australis Limited | Hospitality | 2024 |
| ARK Solutions SW Ltd | Administrative & support | 2019 |
| ARK Waste Solutions Ltd | Water & waste | 2019 |
| Armadillo Engineering (UK) Limited | Manufacturing | 2001 |
| Armancette Holdings Ltd | Professional & scientific | 2026 |
| Arnie Griffiths Limited | Wholesale & retail | 2013 |
| Arran View Holding Ltd | Energy | 2022 |
| Arran View Storage Ltd | Energy | 2020 |
| Arrea Estates Limited | Construction | 2024 |
| Arrow and Snip Consulting Ltd | Professional & scientific | 2025 |
| Art & Antiques for Investment Limited | Extraterritorial | 2020 |
| Art Brew Ltd | Extraterritorial | 2005 |
| Arts Management Services Ltd | Arts & recreation | 2025 |
| Ashcombe Care Ltd | Health & social care | 2025 |
| Ashley Collins Painting & Decorating Limited | Construction | 2008 |
| Askum.Io Ltd | Information & communication | 2022 |
| Assured Property Rentals Limited | Real estate | 1995 |
| Asterion and Collaborators Limited | Education | 2025 |
| AT NO12 Ltd | Hospitality | 2019 |
| Athla Capital Management Limited | Financial services | 2018 |
| Atlantis Skincare Ltd | Manufacturing | 2015 |
| Atlas South West Limited | Transport & logistics | 2014 |
| Attwood IT Solutions Ltd | Information & communication | 2023 |
| Aurcam Construction Limited | Construction | 2014 |
| Aurelius Partners Limited | Manufacturing | 2014 |
| Austin Developments South West Limited | Construction | 2019 |
| Austin Shaw Limited | Professional & scientific | 2017 |
| Autolux Southwest Limited | Wholesale & retail | 2025 |
| Automotive Technical Solutions (SW) Limited | Wholesale & retail | 2025 |
| Automotive Tool Solutions Limited | Wholesale & retail | 2022 |
| Automotive Training Solutions Limited | Professional & scientific | 2017 |
| Autosava Limited | Wholesale & retail | 2005 |
| Avante Transport Ltd | Transport & logistics | 2024 |
| Avenue Engineering Ltd | Professional & scientific | 2010 |
| Avery Management Limited | Professional & scientific | 1989 |
| Avon Autos Ltd | Wholesale & retail | 2025 |
| Avon Dog Services Ltd | Other services | 2013 |
| Avon Electrics Ltd | Construction | 2001 |
| AW Agricultural Solutions Ltd | Agriculture & fishing | 2024 |
| Axis Developments South West Limited | Construction | 2026 |
| AYC Holdings Limited | Financial services | 2023 |
| AYC RESPONSE24 Limited | Extraterritorial | 2022 |
| AYC Training & Consultancy Limited | Professional & scientific | 2020 |
| Azpe UK Ltd | Wholesale & retail | 2024 |
| B & S Healthcare Limited | Health & social care | 2004 |
| B a Bookkeeping Limited | Professional & scientific | 2011 |
| B G Barnes Builders Limited | Construction | 2016 |
| B Wiltshire Electrical Ltd | Construction | 2023 |
| B.A.R Air Services Ltd | Professional & scientific | 2021 |
| B.N Services (Bristol) Ltd | Other services | 2011 |
| B2 Developments Limited | Real estate | 2023 |
| Backdesk Solutions Limited | Administrative & support | 2014 |
| Bainesbury Developments Limited | Construction | 2015 |
| Bainesbury Holdings Limited | Real estate | 2014 |
| BAM Industries Ltd | Administrative & support | 2025 |
| Baptiste Grant Limited | Administrative & support | 2011 |
| Bar JAK Ltd | Manufacturing | 2023 |
| Barby Road (Kilsby) Management Company Ltd | Households | 2026 |
| Barleywood Management Company Limited | Households | 2005 |
| Barrow House Farm Management Company Limited | Hospitality | 1991 |
| Bath & West Pro Tiling Limited | Construction | 2019 |
| Bath and Wells Education Services Ltd | Real estate | 2013 |
| Bath and West Water Softeners Limited | Wholesale & retail | 2019 |
| Bath Building Holdings Limited | Professional & scientific | 2024 |
| Bath Canal Craft Ltd | Construction | 2019 |
| Bath Cast Stone Ltd | Manufacturing | 2010 |
| Bath Court Limited | Real estate | 2015 |
| Bath Marketing Consultancy Ltd | Professional & scientific | 2009 |
| Bath Motor Club Events Ltd | Arts & recreation | 2024 |
| Bath Motor Club Limited | Arts & recreation | 1976 |
| Bath Roofing Contractors Ltd | Construction | 2021 |
| Bath Roofing Investments Limited | Real estate | 2025 |
| Bath School of Acting Limited | Arts & recreation | 2017 |