| Andrews Limited | Extraterritorial | 1982 |
| Angel Auctions Ltd | Wholesale & retail | 2023 |
| Angel Estate Agents & Auctioneers Ltd | Real estate | 2025 |
| Angle Studios Ltd | Information & communication | 2012 |
| Animate Arts Company C.I.C. | Education | 2007 |
| Annie Brown Ltd | Wholesale & retail | 2019 |
| Another Moment Ltd | Manufacturing | 2026 |
| Anthology Publishing Limited | Information & communication | 2019 |
| Anthony Weston Limited | Professional & scientific | 2013 |
| Antipodean Action Ltd | Professional & scientific | 2015 |
| Antique French Baths Limited | Wholesale & retail | 2018 |
| ANY Application Ltd | Wholesale & retail | 2019 |
| Apastron Ltd. | Information & communication | 2017 |
| Aprilday Limited | Wholesale & retail | 2022 |
| Aqualink Services Ltd | Construction | 2015 |
| Arcady Studio Ltd | Professional & scientific | 2009 |
| Arcbond Limited | Professional & scientific | 2024 |
| Archive & General Storage Limited | Transport & logistics | 1996 |
| Ardleigh Solar Limited | Energy | 2013 |
| ARK Music Limited | Professional & scientific | 2010 |
| Arnold Brae Farm Limited | Agriculture & fishing | 2002 |
| ARQ Property Limited | Real estate | 2019 |
| Arrive in Style Cars Limited | Transport & logistics | 2018 |
| Arte Conservation Limited | Arts & recreation | 2014 |
| Arter & Co Construction Ltd | Construction | 2020 |
| Arthur's Logistics Ltd | Transport & logistics | 2025 |
| Arthurs Exterior Maintenance Ltd | Administrative & support | 2026 |
| Arthurs&Burchell Property Management Ltd | Real estate | 2025 |
| Arunway Ltd | Construction | 2018 |
| ASC Finance Ltd | Financial services | 2025 |
| ASG Installations Ltd | Construction | 2026 |
| ASH Valley Energy Reserve Ltd | Energy | 2025 |
| Ashford Signmakers Limited | Manufacturing | 1992 |
| Ashley Rose Escapes Ltd | Administrative & support | 2025 |
| Assistiv Systems Ltd | Information & communication | 2026 |
| Association of Geotechnical and Geoenvironmental Specialists | Other services | 1991 |
| Assured Food Standards | Hospitality | 2003 |
| Astra Decor Limited | Real estate | 2001 |
| Astwood Energy Reserve Ltd | Energy | 2026 |
| Astwood Green Energy Ltd | Energy | 2022 |
| Aswasisnow Limited | Wholesale & retail | 2020 |
| Atina Accounts Limited | Professional & scientific | 2020 |
| Atomic Squib Limited | Other services | 1998 |
| Aucuba Sciences Limited | Professional & scientific | 2016 |
| Autism Leap and Thrive CIC | Education | 2025 |
| Autumn Care Group Ltd | Health & social care | 2026 |
| Autumn Meadows Ltd | Hospitality | 2024 |
| Avante Care and Support Limited | Health & social care | 1990 |
| Avante Care Services Ltd | Health & social care | 2015 |
| Avatar Digital Ltd | Information & communication | 2018 |
| Avatar Property Ltd | Real estate | 2022 |
| Avia Software Limited | Information & communication | 2008 |
| AW Secretaries Limited | Professional & scientific | 2014 |
| AWA Game Design Ltd | Arts & recreation | 2025 |
| Axiom Water Consultancy Ltd | Professional & scientific | 2009 |
| Aysh Wakeley Ltd | Real estate | 2022 |
| Ayshland Ltd | Construction | 2020 |
| B & M Decorating & Property Maintenance Limited | Construction | 2014 |
| B R Brooks and SON Limited | Agriculture & fishing | 2016 |
| Baby Barristers Ltd | Administrative & support | 2020 |
| Bafflegab Productions Ltd | Arts & recreation | 2018 |
| Bafiyow Investment and Development Company Ltd | Real estate | 2019 |
| Bailey & Liddle and MP Vehicle Care Limited | Wholesale & retail | 2022 |
| Balucchi's Limited | Professional & scientific | 2023 |
| Bamberry COX Limited | Real estate | 2025 |
| Bang! Bang! Thai Ltd | Hospitality | 2025 |
| Bark and Stitch Ltd | Manufacturing | 2025 |
| Barkers of Faversham Limited | Wholesale & retail | 2002 |
| Baseline General Co. Ltd | Wholesale & retail | 2025 |
| Battlefield Partnerships Ltd | Professional & scientific | 2010 |
| Bavington Mount Energy Limited | Energy | 2014 |
| Baxter Builder Limited | Construction | 2023 |
| Baxter Investments (Kent) Limited | Financial services | 2025 |
| Bay Branded Merch Ltd | Administrative & support | 2024 |
| Bayside Training Ltd | Education | 2010 |
| Beam Reach Media Limited | Information & communication | 2014 |
| Beardy BS Original Ltd | Manufacturing | 2022 |
| Beauty Unboxed Ltd | Wholesale & retail | 2024 |
| Beautybymay Ltd | Professional & scientific | 2021 |
| BEE Wild Ltd | Professional & scientific | 1998 |
| Beeswax Graphics Limited | Administrative & support | 2017 |
| Belgar Farms Ltd | Real estate | 2015 |
| Belmont Film Services Limited | Administrative & support | 2026 |
| Belmont Paddocks Limited | Hospitality | 2025 |
| Beltran Fruit Ltd | Wholesale & retail | 2019 |
| Benfer Limited | Wholesale & retail | 2019 |
| Benjamin Charles Investment Capital Limited | Real estate | 1998 |
| Bertie's Nursery Limited | Education | 2014 |
| Bespoke Properties Abroad Ltd | Information & communication | 2025 |
| Beths World Limited | Wholesale & retail | 2026 |
| Better Ball Golf Ltd | Manufacturing | 2023 |
| Bettina Dawson Consultancy Ltd | Professional & scientific | 2023 |
| Bexley Green Energy Centre Ltd | Energy | 2023 |
| Beyond the Clouds Software Ltd | Information & communication | 2015 |
| BGFL(2015) Limited | Real estate | 1976 |
| BGM IT Ltd | Wholesale & retail | 2023 |
| BH Synergy Limited | Construction | 2011 |
| BI International Ltd | Wholesale & retail | 2025 |
| Bianca Investments Limited | Real estate | 2023 |
| Big Friendly Graphic Production Limited | Arts & recreation | 2017 |