| 13 Downing Street Limited | Real estate | 2017 |
| 13/16 Marcus Street Management Company Limited | Administrative & support | 1997 |
| 1400S Ltd | Professional & scientific | 2018 |
| 164 Marlborough Road Limited | Real estate | 2013 |
| 17/20 Marcus Street Company Limited | Households | 2008 |
| 2 Ormonde Gate Limited | Real estate | 2012 |
| 20-20 Public Relations Limited | Professional & scientific | 1992 |
| 200 Design Limited | Professional & scientific | 2023 |
| 22 Thoroughbred Racing Limited | Arts & recreation | 2024 |
| 23 - 27 High Street (Great Bedwyn) Limited | Households | 2019 |
| 3 Sixty Market Research Limited | Professional & scientific | 2014 |
| 30, Leathwaite Road, London, SW11 Limited | Households | 1984 |
| 365 Telecoms Limited | Information & communication | 2023 |
| 3WP Limited | Real estate | 2016 |
| 40MP (Penzance) Ltd | Real estate | 2023 |
| 4AMIGOS Restaurant (Cheshire) Limited | Hospitality | 2020 |
| 56 Oxford Road Limited | Households | 1985 |
| 7-9 Wharf Street Limited | Real estate | 2026 |
| 7NINEFIVE Building & Electrical Services Ltd | Administrative & support | 2020 |
| 8 Falkland Road (Newbury) Property Limited | Households | 2016 |
| 83 Southfield Road Limited | Real estate | 2025 |
| 84 Digital Ltd | Professional & scientific | 2019 |
| 89 High Street Hungerford Limited | Hospitality | 1998 |
| 97 & 98 High Street (Hungerford) Management Company Limited | Households | 2003 |
| A New Way Education Limited | Education | 2012 |
| A Smith Engineering Limited | Manufacturing | 2023 |
| A&D Car Body Repairs Limited | Wholesale & retail | 2025 |
| A. J. Callaway Ltd | Construction | 2020 |
| A.M. Electrics Limited | Manufacturing | 1994 |
| A3X Limited | Professional & scientific | 2025 |
| A4 Building & Renovation Limited | Construction | 2007 |
| Abbotts Meadow (Steventon) Management Company Limited | Households | 2014 |
| Abley Letchford Group Ltd | Financial services | 2021 |
| Abley Letchford Partnership Limited | Professional & scientific | 2014 |
| Abstraction Ltd | Information & communication | 2025 |
| Accelerated Career Results Limited | Professional & scientific | 2008 |
| Accomplish Fitness Retreats Limited | Other services | 2019 |
| Acoustics Central Ltd | Professional & scientific | 2012 |
| ACS Motorsport UK Limited | Professional & scientific | 2022 |
| Actionlake Properties Limited | Real estate | 1993 |
| Acworths Limited | Agriculture & fishing | 2026 |
| Adam Courthold Ltd | Information & communication | 2023 |
| Adam Gough Plastering Services Ltd | Construction | 2014 |
| Adaptable Creative Ltd | Information & communication | 2026 |
| AE Response Medical Ltd | Other services | 2024 |
| Aerolatte Limited | Wholesale & retail | 2004 |
| AFF Holdings Limited | Administrative & support | 2016 |
| Afunja Music Publishing Ltd | Information & communication | 2019 |
| AGM Brickwork Ltd | Construction | 2006 |
| AI Assistant Limited | Information & communication | 2020 |
| AI Grid Ltd | Information & communication | 2024 |
| Aiir Technologies Ltd | Information & communication | 2024 |
| AIM Project Consulting UK Limited | Professional & scientific | 2025 |
| Ainsley Saddlery Ltd | Agriculture & fishing | 2019 |
| Airsoft Forge Limited | Wholesale & retail | 2017 |
| Aissaoui Holding Ltd | Wholesale & retail | 2025 |
| AIT Enterprise Ltd | Information & communication | 2019 |
| AJ Developments Building Contractors Limited | Construction | 2025 |
| AJP Construction Services Limited | Construction | 2012 |
| Ajvir Samra Limited | Hospitality | 2018 |
| AL Anstey Ltd | Professional & scientific | 2017 |
| AL Shaqab Racing UK Limited | Arts & recreation | 2014 |
| Alex Jessett Equine Dentistry Ltd | Agriculture & fishing | 2009 |
| Aline Design Limited | Professional & scientific | 2005 |
| Alined Property Limited | Professional & scientific | 2009 |
| Alkel Limited | | 2006 |
| ALL Works Builders Limited | Construction | 2022 |
| Alliance Surfacing Holdings Limited | Financial services | 2021 |
| Alliance Surfacing Limited | Construction | 1991 |
| Allied Auto Services Limited | Extraterritorial | 1998 |
| Allington Properties LLP | | 2016 |
| Allums Property Services Ltd | Construction | 2019 |
| ALPHA2DELTA Design Ltd | Manufacturing | 2015 |
| Altore Properties Limited | Real estate | 2017 |
| Ampm Private Hire Limited | Transport & logistics | 2018 |
| AMS International Couriers Ltd | Transport & logistics | 2008 |
| Amsaac Ltd | Information & communication | 2011 |
| Amstel Advisers Limited | Professional & scientific | 2016 |
| Amtecs Limited | Wholesale & retail | 1996 |
| Amtecs Logistics Limited | Transport & logistics | 1997 |
| Amtion Ltd | Professional & scientific | 2024 |
| Andrew Branch Property Consultants Ltd | Real estate | 2008 |
| Andrew Street Wealth Management Limited | Professional & scientific | 2016 |
| Andsum Limited | Information & communication | 2001 |
| Andsum Property Limited | Real estate | 2020 |
| Angela Knight Limited | Wholesale & retail | 2016 |
| Anglo Turkish Investments Ltd | Real estate | 2007 |
| Angus Alexandra Associates Limited | Professional & scientific | 2024 |
| Animaro Limited | Manufacturing | 2016 |
| ANP United Limited | Health & social care | 2013 |
| ANT Films Ltd | Information & communication | 2018 |
| ANTEP27 Ltd | Hospitality | 2024 |
| AP Enterprises Limited | Arts & recreation | 2000 |
| Apache Strategy Limited | Financial services | 2002 |
| Apfm UK Limited | Information & communication | 2018 |
| Apro IFM Limited | Professional & scientific | 2011 |
| APT Carpentry & Building Limited | Construction | 2022 |
| Aquality Pool Service Limited | Manufacturing | 2024 |
| Arab Horse Society(The) | Other services | 1968 |
| Archbridge Commerce Limited | Other services | 2022 |