| ANR Site Services Limited | Construction | 2014 |
| AP Leisure Group Ltd | Real estate | 2024 |
| Apex Bouldering Ltd | Arts & recreation | 2023 |
| Apex Research Systems Ltd | Wholesale & retail | 2026 |
| APL Technologies Limited | Professional & scientific | 2023 |
| Apollo Homes Properties Ltd | Construction | 2021 |
| Applegate Developments Limited | Real estate | 2025 |
| Appol Trading Ltd | Information & communication | 2011 |
| Approach Property and Garden Maintenance Ltd | Administrative & support | 2013 |
| APW Computers Ltd | Information & communication | 2020 |
| Arborcare (UK) Limited | Agriculture & fishing | 2006 |
| Arcimo Design Limited | Professional & scientific | 2017 |
| Arden White Limited | Administrative & support | 2017 |
| Ardent Life Ltd | Wholesale & retail | 2022 |
| Ardico Developments Limited | Professional & scientific | 2010 |
| Arias Sreti Limited | Other services | 2017 |
| Arias Sreti Online Ltd | Wholesale & retail | 2019 |
| Armada Glazing Ltd | Construction | 2026 |
| Armstrong Archard Property Consultants Limited | Professional & scientific | 2022 |
| Ascham Ltd | Real estate | 2018 |
| ASD Workshops Limited | Administrative & support | 2020 |
| Ashlee Rise Limited | Administrative & support | 2024 |
| Ashley Pidgeon Limited | Professional & scientific | 2012 |
| ASK a Lender Limited | Extraterritorial | 2012 |
| ASK J Flooring Ltd | Construction | 2021 |
| ASK My Mobile Limited | Construction | 2012 |
| Askar Investments Limited | Real estate | 2011 |
| Aspectnano Solutions Ltd | Professional & scientific | 2020 |
| Aspire Home Clean Ltd | Administrative & support | 2025 |
| Aspire Insurance Services Limited | Financial services | 2007 |
| Assert Services Limited | Financial services | 2004 |
| Asset Services Group Limited | Information & communication | 2021 |
| Assignments in Marketing Limited | Administrative & support | 2006 |
| Astar Catering Ltd | Hospitality | 2026 |
| Aston Events Limited | Hospitality | 2019 |
| Aston Service Dorset Limited | Administrative & support | 2017 |
| Asylum Artistry Limited | Other services | 2023 |
| Athertons (Bournemouth) Limited | Real estate | 1986 |
| Atina Property Management Ltd | Real estate | 2018 |
| Atkins Bland Limited | Financial services | 1995 |
| ATL Europe (France) Limited | Extraterritorial | 2019 |
| Atmaan Limited | Real estate | 2022 |
| Atrena LLP | | 2020 |
| Atthis Limited | Construction | 2020 |
| Aucott Interior Design Limited | Arts & recreation | 2011 |
| Aureus Electrical Ltd | Construction | 2015 |
| Autistic Working Mums Ltd | Education | 2025 |
| Autoexa Group Ltd | Wholesale & retail | 2026 |
| Automated Commerce Exchange Limited | Information & communication | 2020 |
| Autospec QA Ltd | Information & communication | 2023 |
| AV Brickwork Ltd | Construction | 2020 |
| Avensa Trading Limited | Administrative & support | 2007 |
| Avon Forest Chimneys Ltd | Construction | 2012 |
| Avon Forest Ltd | Administrative & support | 2017 |
| Avon House Pool Hire Limited | Arts & recreation | 2022 |
| AXE Engineering Limited | Professional & scientific | 2010 |
| Aztec Services Techniques Ltd | Other services | 2014 |
| Azurite Magazine Ltd | Information & communication | 2023 |
| B&V Homes Limited | Real estate | 2019 |
| B.A.R Minibuses Limited | Administrative & support | 2019 |
| Babian Ltd | Professional & scientific | 2025 |
| Bailey Bathrooms Limited | Wholesale & retail | 2012 |
| Balanced Bookkeeping & Payroll Ltd | Professional & scientific | 2022 |
| Ball Architecture Ltd | Professional & scientific | 2014 |
| Bambu Food & Drinks Ltd | Hospitality | 2025 |
| Banfield Real Estate Limited | Real estate | 2017 |
| Barnes Farm Properties Limited | Real estate | 2025 |
| Baron Medical Limited | Wholesale & retail | 2010 |
| Barts Brickwork & Building Limited | Construction | 2017 |
| Basil Hawa Limited | Real estate | 2018 |
| Bay Tree Houses Limited | Construction | 2025 |
| Bayat Medical Limited | Health & social care | 2016 |
| Bayview (Prospect Farm) Ltd | Construction | 2018 |
| Bayview Developments (Brockenhurst) Ltd | Construction | 2022 |
| Bayview Developments (Christchurch) Limited | Construction | 2018 |
| Bayview Developments (Corfe Mullen) Limited | Construction | 2026 |
| Bayview Developments (Highcliffe) Limited | Construction | 2018 |
| Bayview Developments (Milford) Limited | Construction | 2021 |
| Bayview Developments (South) Limited | Construction | 1996 |
| Bayview Developments (Wessex) Ltd | Construction | 2025 |
| Bayview Developments (Woolsbridge) Ltd | Real estate | 2021 |
| Bayview Investments (Bournemouth) Limited | Construction | 2017 |
| Bayview Investments (South) Limited | Real estate | 2010 |
| BAZ Barbers Fadezone Ltd | Other services | 2025 |
| Bazaarbizzare Ltd | Wholesale & retail | 2025 |
| BB Electrical & Renewables Ltd | Construction | 2022 |
| BC Family Holdings Ltd | Financial services | 2022 |
| BCE Holdings Limited | Real estate | 2016 |
| BCL Design Limited | Real estate | 2020 |
| BCP Property Maintenance Ltd | Construction | 2025 |
| BD Craig Electrical Limited | Manufacturing | 2010 |
| BE Ready Ltd | Transport & logistics | 2003 |
| Beacon Stables Ltd | Construction | 2015 |
| Bearwood Motors Ltd | Wholesale & retail | 2024 |
| Beavan Electrics Ltd | Construction | 2026 |
| Beechwood Leisure Limited | Information & communication | 1989 |
| Beirut Lounge Bistro Limited | Hospitality | 2015 |
| Belfield Facilities Management Ltd | Construction | 2024 |
| Belltech Engineering Ltd | Manufacturing | 2001 |
| Bemax Properties Limited | Real estate | 1997 |