| Austin Park (Ringwood) Management Company Limited | Households | 2015 |
| Auto Wheels Car Sales Ltd | Wholesale & retail | 2014 |
| Autobot Vehicle Sales Ltd | Wholesale & retail | 2020 |
| Automeds Pharmacy Ltd | Wholesale & retail | 2009 |
| Automotive Compressor Repairs Limited | Wholesale & retail | 2005 |
| Autumn Homes Limited | Extraterritorial | 2024 |
| Avalon Homes Ltd | Real estate | 2019 |
| Avencera Ltd | Professional & scientific | 2018 |
| Avenir Works 1 Limited | Real estate | 2015 |
| Aventus Real Estate Limited | Real estate | 2023 |
| Avenue Shelfco 57 Limited | Construction | 2008 |
| Avionics Support Engineering Ltd | Manufacturing | 2022 |
| Avon Castle Drive Residents Company Limited | Households | 1983 |
| Avon Construction Group Limited | Construction | 2015 |
| Avon Construction Limited | Construction | 2005 |
| Avon Forest Autos Limited | Wholesale & retail | 2005 |
| Avon Foresta Ltd | Construction | 2021 |
| Avon Project Services Limited | Professional & scientific | 2002 |
| Avon Valley Framing Limited | Other services | 2011 |
| Avon View Maintenance Ltd | Households | 2025 |
| Avonmead Kitchens Ltd | Construction | 2025 |
| AW Exhibitions Ltd | Administrative & support | 2025 |
| Ayla Mortgages Ltd | Financial services | 2020 |
| Ayleswade Court Freehold Limited | Households | 2014 |
| Azure Development Holdings Limited | Information & communication | 2022 |
| Azure Development Solutions Ltd | Manufacturing | 2007 |
| Bagnum Equestrian Centre Ltd | Agriculture & fishing | 2015 |
| Bakehouse 24 Ltd | Manufacturing | 2015 |
| Baker Carpentry & Building Ltd | Manufacturing | 2025 |
| Balcombe Road Management Company Limited | Households | 2010 |
| Bambi's Bakes Ltd | Wholesale & retail | 2024 |
| Barber Asset Holdings Ltd | Financial services | 2024 |
| Barkers of Windsor Limited | Manufacturing | 2007 |
| Barnes Education Services Ltd | Professional & scientific | 2010 |
| Baron Contracting (Southern) Limited | Construction | 2002 |
| Barrakav Properties (Portsmouth) Limited | Real estate | 2012 |
| Barrakav Properties (Salisbury) Limited | Real estate | 2016 |
| Barrett Heritage Restorations Ltd | Construction | 2026 |
| Bartlett DE Choc Ltd | Manufacturing | 2024 |
| Bates Property Maintenance Ltd | Construction | 2023 |
| Baxxters Ltd | Professional & scientific | 2011 |
| Baytech Site Engineers Ltd | Construction | 2020 |
| Bayview (Southbourne) Limited | Households | 2002 |
| Bbbr Property Limited | Real estate | 2024 |
| BDR Torquay Limited | Real estate | 2020 |
| BE Exhibitions Ltd | Administrative & support | 2019 |
| Beach Close (Management) Company Limited | Households | 1962 |
| Beakes Financial Solutions Limited | Financial services | 2022 |
| Beamwalker Limited | Manufacturing | 2001 |
| Beancounter Limited | Extraterritorial | 2004 |
| Bearpod Limited | Wholesale & retail | 2025 |
| Beatnik Emporium Limited | Wholesale & retail | 2016 |
| Beaufort Care Group Limited | Health & social care | 2003 |
| Beaufort Education and Care Group EOT Limited | Financial services | 2025 |
| Beaufort Education and Care Group Limited | Financial services | 2022 |
| Beaufort Education Limited | Extraterritorial | 2022 |
| Beaufort Mews Residents Association Limited | Households | 1985 |
| Beaufort Support Services Limited | Hospitality | 2020 |
| Beaumont Court Limited | Households | 2000 |
| Beautiful Births Ltd | Administrative & support | 2017 |
| Beckley Walk Management Company 1 Limited | Households | 2020 |
| Bedstretch Limited | Manufacturing | 2017 |
| Beer and Nuts Ltd | Hospitality | 2022 |
| Befit Hampshire Limited | Arts & recreation | 2020 |
| Bega Marketing Limited | Information & communication | 2014 |
| Belinda's Bakery Ltd | Wholesale & retail | 2023 |
| Belldale Limited | Other services | 2013 |
| Beneath the Publishing Ltd | Information & communication | 2023 |
| Bennetton Motortec Ltd. | Wholesale & retail | 2003 |
| Bequip Limited | Administrative & support | 1987 |
| Bespoke Carpentry & Marine Ltd | Manufacturing | 2024 |
| Best Garage (Ringwood) Ltd | Wholesale & retail | 2019 |
| Best Pathway Ltd | Education | 2023 |
| Best Protect Financial Services Limited | Professional & scientific | 2020 |
| Betsy Group (UK) Limited | Other services | 2013 |
| Better Info Tech Ltd | Information & communication | 2014 |
| Bewisr Limited | Professional & scientific | 2024 |
| BFC Ventures Ltd | Financial services | 2025 |
| BFP Partners Ltd | Financial services | 2017 |
| BFQ Limited | Information & communication | 2015 |
| BH Coatings Ltd | Wholesale & retail | 2025 |
| BH23 International Ltd | Administrative & support | 2019 |
| Bickerley Road Developments Ltd | Construction | 2018 |
| Big Shine Hand Car Wash Limited | Administrative & support | 2009 |
| Billing Chimney and Flue Services Limited | Construction | 2002 |
| Billing Support Services Limited | Information & communication | 2004 |
| BIN Busy Recycling Limited | Administrative & support | 2009 |
| BIN There Cleaned That Ltd | Administrative & support | 2025 |
| Biofix Ltd | Manufacturing | 2021 |
| Bishops Park (Cloisters & Cardinal) Management Company Limited | Households | 1999 |
| Bitwise Consultancy Services Limited | Manufacturing | 2004 |
| BL Electrical Ltd | Construction | 2022 |
| Blackbird Homes (Wilson Court) Management Limited | Households | 2021 |
| Blackhill Investments Limited | Construction | 2006 |
| Blades Bikes Ltd | Wholesale & retail | 2020 |
| Blandford Estates Limited | Construction | 2000 |
| Blashford Consulting Ltd | Professional & scientific | 2023 |
| Blooming Properties Ltd | Construction | 2021 |
| Blue Cedars (West Moors) Management Company Limited | Households | 2009 |
| Blue Sea Holdings Limited | Real estate | 2015 |