| 1-5 Franwill Gardens Limited | Households | 2024 |
| 24-7 Property Assistance Ltd | Administrative & support | 2026 |
| 241 Games Ltd | Information & communication | 2025 |
| 3D Steel Services Ltd | Construction | 2016 |
| 3DSS Ltd | Construction | 2023 |
| 5 Oakfield Street Blandford Management Company Limited | Households | 2009 |
| 58 Group Ltd | Professional & scientific | 2024 |
| 6 Carlton Road Freehold Limited | Households | 2017 |
| A & B Home Improvements Limited | Construction | 2002 |
| A Barkers Fermenting Ltd | Manufacturing | 2020 |
| A Good Life Limited | Health & social care | 2025 |
| A J Precision Engineering Ltd | | 2004 |
| A M Carpentry Ltd | Construction | 2015 |
| A M R Lester Limited | Financial services | 2016 |
| A P Stephens & Sons Limited | Construction | 2003 |
| A W Carpentry Services Limited | Construction | 2005 |
| A&M J Projects Ltd | Professional & scientific | 2024 |
| A.M Home Solutions Ltd | Construction | 2016 |
| A3C (U.K.) Limited | Professional & scientific | 2013 |
| Aacem Ltd | Professional & scientific | 2022 |
| AD Agronomy Limited | Administrative & support | 2013 |
| Adam Heetun Limited | Health & social care | 2025 |
| Adora Crafted Ltd | Wholesale & retail | 2024 |
| Adrian Fisher Design Limited | Arts & recreation | 2008 |
| Advance Dynamics Ltd | Information & communication | 2020 |
| Adwarner & Co Ltd | Construction | 2024 |
| Aerial Views SW Ltd | Information & communication | 2026 |
| Afterjam Events Co Ltd | Wholesale & retail | 2019 |
| Afterjam Merch Co Ltd | Wholesale & retail | 2019 |
| Agate Material Handling Ltd | Manufacturing | 2023 |
| Agni Fuels Ltd | Wholesale & retail | 2023 |
| Agri-Comm Limited | Wholesale & retail | 2013 |
| AIP Mortgages Ltd | Financial services | 2020 |
| Airing IT OUT Limited | Health & social care | 2024 |
| AK Best Car Wash Ltd | Professional & scientific | 2025 |
| Alan Cosgrove Limited | Professional & scientific | 2009 |
| Alan K Horley Landscaping Ltd | Administrative & support | 2026 |
| Albion Building Company Ltd | Construction | 2024 |
| Albion Building Contractors Ltd | Construction | 2024 |
| Alchemy Financial Limited | Financial services | 2005 |
| Alexandra Robinson Ltd | Manufacturing | 2018 |
| Alimax Limited | Manufacturing | 2019 |
| ALL BUT Thread Ltd | Wholesale & retail | 2024 |
| ALL Care Property Maintenance Limited | Other services | 2002 |
| ALL Insure Services Limited | Financial services | 2009 |
| ALL Regions Medical Services Ltd | Health & social care | 2026 |
| Alpha Business Concepts Limited | Financial services | 2025 |
| Alvori Ltd | Wholesale & retail | 2024 |
| Amberlite Projects Ltd | Wholesale & retail | 2024 |
| Amey's Automotive Limited | Wholesale & retail | 2021 |
| Amfax Limited | Manufacturing | 1986 |
| Amplified Network Ltd. | Wholesale & retail | 2021 |
| Anchovy Pictures Ltd | Information & communication | 2008 |
| Anne Cowley Education Ltd | Education | 2020 |
| Anstey Family Investments (UK) Limited | Information & communication | 2015 |
| Anvil Props Ltd | Arts & recreation | 2024 |
| Apartment 22 Limited | Information & communication | 2017 |
| Appletree Landscapes Limited | Real estate | 2003 |
| Applied Prose Limited | Arts & recreation | 2025 |
| Aquavision Distribution Limited | Manufacturing | 2011 |
| Arcana Holdings Limited | Financial services | 2025 |
| Archson Ltd | Transport & logistics | 2024 |
| Arding Jones Property Ltd | Real estate | 2024 |
| Artisan Tipis Ltd | Administrative & support | 2026 |
| Artwell Media Ltd | Arts & recreation | 2002 |
| Asbestos Consultancy Ltd | Extraterritorial | 2022 |
| ASF Plant Hire Limited | Administrative & support | 2003 |
| Ashburton House Management Company (Blandford) Limited | Hospitality | 2001 |
| Ashley Wood Commercials Limited | Wholesale & retail | 2017 |
| Ashley Wood Golf Shop Limited | Wholesale & retail | 2016 |
| Ashmore Distribution Ltd | Manufacturing | 2023 |
| Ashmore Manufacturing Ltd | Manufacturing | 2022 |
| Ashurst Pest Control Ltd | Administrative & support | 2023 |
| Assist Inventories Ltd | Real estate | 2014 |
| Assist Networks TIN Ltd | Wholesale & retail | 2019 |
| Association of Ophthalmic Nurses and Technicians (UK) Ltd | Health & social care | 1970 |
| Astral Couriers Limited | Transport & logistics | 2001 |
| ATC Mech Serv Ltd | Wholesale & retail | 2015 |
| Atomos Systems Ltd | Information & communication | 2025 |
| AU Lait Ltd | Financial services | 2024 |
| Aurea Fashion Ltd | Wholesale & retail | 2025 |
| Ausus Ltd | Wholesale & retail | 2022 |
| Avalon Asset Management Limited | Real estate | 2007 |
| Aveiro BPS Ltd | Construction | 2019 |
| Avon Forest Services Limited | Other services | 2017 |
| Avon Forest Training Limited | Other services | 2015 |
| Ayun Catering Ltd | Hospitality | 2026 |
| B & a Computers Limited | Manufacturing | 1992 |
| B & D Builders (Blandford) Limited | Construction | 2011 |
| B W Heating and Plumbing Services Ltd | Construction | 2024 |
| B&C Creations Ltd | Information & communication | 2025 |
| Back and Forth Screen Prints Ltd | Manufacturing | 2020 |
| Badbury Heights (Blandford) Management Company Limited | Households | 2008 |
| Badbury Heights Management Company Limited | Households | 2004 |
| Badger House Nominees Limited | Professional & scientific | 2006 |
| Bahnsport Ltd | Wholesale & retail | 2021 |
| Balanced Controls Limited | Professional & scientific | 2016 |
| Ball Energy Advisors Ltd | Professional & scientific | 2026 |
| Barramundi Wines Ltd | Manufacturing | 2017 |
| Barrington International (SSS) Limited | Wholesale & retail | 2011 |