| Anytime Ventures (Bloomsbury) Limited | Extraterritorial | 2021 |
| Anytime Ventures (Chelsea) Limited | Real estate | 2020 |
| Apex a Limited | Professional & scientific | 2012 |
| Apollo Digital Media Limited | Wholesale & retail | 2016 |
| Apricity Geoscience Ltd. | Professional & scientific | 2022 |
| Aquafayre Limited | Wholesale & retail | 2006 |
| Aquarius Managed Services Limited | Information & communication | 2024 |
| ARA Coffee Limited | Hospitality | 2022 |
| Arbiter(Adjuster,Valuers and Surveyors) Ltd | Professional & scientific | 2013 |
| ARC Medical Services Limited | Education | 2024 |
| Archangel Consulting Ltd | Professional & scientific | 2022 |
| Architectural and Civil Engineering Designs Limited | Professional & scientific | 2002 |
| Archizo Developments Limited | Construction | 2024 |
| Arcseer Limited | Information & communication | 2026 |
| Ardnave Capital Limited | Professional & scientific | 2019 |
| Ardnave Holdings Limited | Financial services | 2011 |
| Ardnave Management Limited | Professional & scientific | 2017 |
| Arenberg Manufacturing Consulting Limited | Professional & scientific | 2023 |
| ARK Carpentry and Joinery Ltd | Construction | 2009 |
| Arldo Ltd | Wholesale & retail | 2024 |
| Arlo & Oates Ltd | Hospitality | 2022 |
| Art-Boriculture Ltd | Administrative & support | 2023 |
| Artim Property Group Ltd | Real estate | 2025 |
| Artisan Haus Ltd | Information & communication | 2023 |
| ARV (UK) Limited | Administrative & support | 2000 |
| AS Plus Limited | Administrative & support | 2024 |
| Asesoria Consulting Limited | Extraterritorial | 2019 |
| Asesoria Group Limited | Professional & scientific | 2015 |
| Asesoria Limited | Extraterritorial | 2015 |
| ASH Talent Acquisition Ltd | Administrative & support | 2023 |
| Ashton Bespoke Joinery Limited | Construction | 2024 |
| Ashurst Property Investments Limited | Real estate | 2006 |
| Asikora Renovations Ltd | Construction | 2023 |
| Aspire Innovation Development Ltd | Manufacturing | 2025 |
| Assmblr Ltd | Wholesale & retail | 2017 |
| Association of Brokers & Yacht Agents Limited(The) | Other services | 1985 |
| Assure Coaching Limited | Education | 2022 |
| Assured Trajectory Consulting Limited | Professional & scientific | 2025 |
| Asterix Labs Ltd | Wholesale & retail | 2024 |
| Astringo Commodities Limited | Information & communication | 2008 |
| Asys Holdings Limited | Real estate | 2022 |
| AT247 Ltd | Wholesale & retail | 2025 |
| Atelier Coachworks Limited | Manufacturing | 2024 |
| Atelier Composites Limited | Manufacturing | 2024 |
| Atelier Performance Coatings Limited | Manufacturing | 2024 |
| Atelier Special Vehicles Limited | Professional & scientific | 2024 |
| ATX Associates Ltd | Professional & scientific | 2017 |
| Atylus Limited | Administrative & support | 2016 |
| Aurelia Capital Ltd. | Professional & scientific | 2022 |
| Aurora Dementia Solutions Ltd | Information & communication | 2026 |
| Austin Lebbon Architecture Limited | Other services | 2021 |
| Austin Lebbon Construction Limited | Other services | 2021 |
| Austin Lebbon Ltd | Construction | 2020 |
| Auto Industry Consulting Ltd | Information & communication | 2011 |
| Avenue Building Services Ltd | Construction | 2016 |
| AW Diagnostics Ltd | Health & social care | 2021 |
| Awenfield Ltd | Professional & scientific | 2026 |
| Aylings Country Garden Centre Limited | Wholesale & retail | 2017 |
| Azabu Limited | Construction | 2007 |
| B Cane Electrical Limited | Construction | 2020 |
| B S Publications Limited | Information & communication | 2016 |
| Bablatola Limited | Hospitality | 2024 |
| Baboy Goods Limited | Wholesale & retail | 2026 |
| Back 2 Health Limited | Health & social care | 1994 |
| Back to YOU Chiropractic Limited | Health & social care | 2017 |
| Bada Boss Ltd | Wholesale & retail | 2026 |
| Baker Projects Ltd | Information & communication | 2011 |
| Bambino Baby Ltd | Wholesale & retail | 2017 |
| Bangladesh 1971 Ltd | Wholesale & retail | 2022 |
| Barden Duct Services Ltd | Professional & scientific | 2022 |
| Barden FM Limited | Construction | 2009 |
| Barden Solutions Limited | Professional & scientific | 2012 |
| Barefoot Technical Limited | Professional & scientific | 2024 |
| Bargate Developments Ltd | Construction | 2007 |
| Bargate Investments Limited | Real estate | 2003 |
| Barkin Fresh Dog Groomers Ltd | Other services | 2021 |
| Barluker RTM Company Limited | Households | 2010 |
| Barnard Design Consultancy Limited | Professional & scientific | 1979 |
| Barncroft Property Limited | Real estate | 2022 |
| Barnsley Bedales Nominee Company Limited | Extraterritorial | 2016 |
| BAS AMP International Manpower Ltd | Administrative & support | 2025 |
| Base Group Solutions Ltd | Hospitality | 2026 |
| Bass Homes Limited | Construction | 2000 |
| Bates Transport (Hampshire) Limited | Transport & logistics | 2010 |
| BC Online Consultancy Limited | Professional & scientific | 2025 |
| BCH Investments Limited | Construction | 2010 |
| BE Snapped Limited | Professional & scientific | 2017 |
| Beamcraft Ltd | Information & communication | 2026 |
| Bean Counter to Boss Ltd | Information & communication | 2024 |
| Beans and Whiskers Ltd | Hospitality | 2022 |
| Beatson Marine Ltd | Wholesale & retail | 2022 |
| Becoming Jane Films Limited | Information & communication | 2006 |
| Bentley and Maya Ltd | Information & communication | 2020 |
| Bentleys Dog Groomers Chichester Limited | Other services | 2020 |
| Bentleys Dog Groomers Petersfield Limited | Other services | 2018 |
| Bentleys Dog Grooming Academy Ltd | Education | 2019 |
| Berkeley Walker Properties Ltd | Real estate | 1999 |
| Best of Hampshire Ltd | Wholesale & retail | 2018 |
| Beverley Boswell Designs Ltd | Professional & scientific | 2019 |
| Bildec Associates Ltd | Manufacturing | 2017 |