| 1-4 Holly Tree Walk RTM Company Limited | Households | 2013 |
| 12 Squared Ltd | Real estate | 2023 |
| 1ST 4 Electrical Installations Limited | Construction | 2012 |
| 20A Warminster Road (Westbury) Management Company Limited | Households | 1996 |
| 21ST Century Business Machines Limited | Other services | 1998 |
| 24/7 Fleet Support Ltd | Transport & logistics | 2025 |
| 24/7 Maintenance Support Ltd | Professional & scientific | 2026 |
| 3DOTS Consulting Limited | Professional & scientific | 2025 |
| 3DSM Ltd | Professional & scientific | 2013 |
| 4 Church Street Westbury Limited | Real estate | 2014 |
| 4 Connections UK Ltd | Professional & scientific | 2004 |
| 45 Building Projects Ltd | Real estate | 2026 |
| 5-8 Holly Tree Walk RTM Company Limited | Households | 2013 |
| 54 Coffee Ltd | Hospitality | 2026 |
| 65 Clouds Hill Road Bristol Limited | Households | 1989 |
| 96-98 High Street Management Company Limited | Households | 1989 |
| A B Windows Limited | Construction | 2019 |
| A J Cocks Transport Limited | Transport & logistics | 2003 |
| A L H Systems Limited | Manufacturing | 1976 |
| A W Mays (Westbury) Limited | Other services | 2014 |
| A&B Logistics Delivery Limited | Transport & logistics | 2021 |
| A.G.V Building Ltd | Construction | 2017 |
| A2B Special Transport Ltd | Transport & logistics | 2023 |
| Aa-Wargames Limited | Wholesale & retail | 2015 |
| Aadhi Food Ltd | Hospitality | 2026 |
| Aadhi Retail Ltd | Wholesale & retail | 2024 |
| Abbybliss Ltd | Manufacturing | 2016 |
| Absolute Web Solutions Limited | Information & communication | 2012 |
| Acacia Energy Group Ltd. | Wholesale & retail | 2017 |
| Actionable Insight Digital Marketing Limited | Information & communication | 2011 |
| Acubens Management Ltd | Financial services | 2014 |
| ADS Water Services Limited | Administrative & support | 2018 |
| Advanced Metal Treatments Limited | Manufacturing | 2018 |
| Aedis Limited | Real estate | 2007 |
| Aesir Elite Ltd | Administrative & support | 2025 |
| Afon Flooring & Interiors Ltd | Construction | 2023 |
| Ah&M Services Ltd | Health & social care | 2021 |
| Air Bath Limited | Real estate | 2020 |
| AJ Home Services Ltd | Construction | 2026 |
| AJ Humphries Ltd | Other services | 2012 |
| AJ Roofing & Gutters Ltd | Construction | 2026 |
| AJB Fire and Security Ltd | Administrative & support | 2025 |
| AJR Auto Body Repairs Limited | Wholesale & retail | 2013 |
| AJR Smart Repairs Limited | Wholesale & retail | 2016 |
| AJT Holdings Limited | Wholesale & retail | 2019 |
| Akdbj Limited | Public administration | 2020 |
| Akerman Consultants Ltd | Professional & scientific | 2024 |
| Akoranga Learning Ltd | Education | 2023 |
| Alannah Rose Ltd | Administrative & support | 2023 |
| Alex Brown Electrical Services Ltd | Construction | 2019 |
| Alithia LLP | | 2010 |
| ALL Drainageservicessw Limited | Construction | 2025 |
| ALL Electrical (SW) Ltd | Construction | 2017 |
| ALL Saints Crescent Management Limited | Real estate | 2001 |
| Allsorts of Fencing Ltd | Administrative & support | 2014 |
| Allyouneedisbooks Ltd | Wholesale & retail | 2012 |
| Alpenhaus Ltd | Construction | 2019 |
| Amazingly Remarkable Properties Ltd | Real estate | 2020 |
| Amber Tour Limited | Administrative & support | 2025 |
| AMC Decor Limited | Construction | 2017 |
| AMR Brickwork Ltd | Construction | 2024 |
| Andrew Walter Associates Ltd | Other services | 2019 |
| ANP Storage Ltd | Transport & logistics | 2018 |
| Apex Body Solutions Limited | Wholesale & retail | 2023 |
| Apex Van Solutions Limited | Wholesale & retail | 2020 |
| Aplates Limited | Manufacturing | 2019 |
| Appcache Ltd. | Information & communication | 2011 |
| Apple Cleaning & Support Services Limited | Extraterritorial | 2017 |
| Apricity Theatre Ltd | Arts & recreation | 2020 |
| Apricot Hill Limited | Wholesale & retail | 2025 |
| Arco: Learn and Make Ltd | Construction | 2023 |
| Arek Electrical Ltd | Construction | 2025 |
| Arke Ltd | Professional & scientific | 2006 |
| Arke Trustee Limited | Professional & scientific | 2026 |
| AS CAD Services Limited | Information & communication | 2017 |
| Ashogbonhealth Ltd | Health & social care | 2023 |
| Ashpalm Limited | Construction | 1984 |
| Asmrdb Ltd | Information & communication | 2019 |
| Aspire Shire Limited | Information & communication | 2015 |
| Astarte Studio Limited | Professional & scientific | 2025 |
| Aston & ZEN Consulting Limited | Professional & scientific | 2005 |
| Aston Motorsport Ltd | Wholesale & retail | 2005 |
| Atkinson Equipment Group Limited | Financial services | 2021 |
| Atlas and Home Limited | Wholesale & retail | 2025 |
| ATR Compounding Limited | Extraterritorial | 2008 |
| Auburn Design Limited | Arts & recreation | 2007 |
| Auctionet UK Ltd | Other services | 2019 |
| Audience Systems Limited | Manufacturing | 1972 |
| Audience Upholstery Ltd | Manufacturing | 2017 |
| Autocade Limited | Wholesale & retail | 2008 |
| Autoexcel Vehicle Services Ltd | Wholesale & retail | 2014 |
| Automotive Goods Ltd | Wholesale & retail | 2023 |
| Automotive Protection Solutions Limited | Manufacturing | 2020 |
| Autoprep Ltd | Wholesale & retail | 2012 |
| Avonmere Marina (Trowbridge) Management Company Limited | Real estate | 1989 |
| B E Services (Warminster) Limited | Construction | 2019 |
| B'S Cafe Ltd | Hospitality | 2016 |
| Badgers Hill Ltd | Arts & recreation | 2025 |
| BAG Kraft Ltd | Manufacturing | 2025 |
| Bank Tackle Ltd | Wholesale & retail | 2017 |