| ABO Medical Ltd | Health & social care | 2024 |
| Abode Resourcing Ltd | Other services | 2022 |
| About Cleaning Ltd | Administrative & support | 2018 |
| Abridge Property Services Limited | Construction | 2005 |
| Abrj Holdings Ltd | Real estate | 2018 |
| ABS Services Limited | Administrative & support | 2024 |
| ABS Trading Services Ltd | Wholesale & retail | 2025 |
| Absolute Action Ltd | Manufacturing | 2012 |
| Absolute LOCKS4VANS Ltd | Manufacturing | 2024 |
| Absolutes Care Agency Ltd | Health & social care | 2023 |
| Abted Limited | Information & communication | 2006 |
| Abundance Grace UK Ltd | Health & social care | 2016 |
| Abuzar Qaisar Virk Ltd | Wholesale & retail | 2026 |
| AC Drylining Ltd | Construction | 2014 |
| Academy (Woolwich) Residents Company Limited(The) | Households | 1986 |
| Academy Eleven Ltd | Education | 2025 |
| Academy House of Beauty Limited | Other services | 2023 |
| ACC Shipping International Limited | Transport & logistics | 2025 |
| ACC Shipping Ltd | Transport & logistics | 1983 |
| Access Heights Scaffolding Ltd | Construction | 2020 |
| Access Property Solutions Ltd | Real estate | 2024 |
| Acciaio Ltd | Construction | 2026 |
| Accomplish Consulting Limited | Professional & scientific | 2018 |
| Accountancy & Taxation Kent Limited | Professional & scientific | 2003 |
| Accountancy at Ltd | Professional & scientific | 2021 |
| Accurate Ground Works Ltd | Construction | 2022 |
| ACD General Construction Ltd | Construction | 2019 |
| Ace Classics (London) Limited | Wholesale & retail | 1996 |
| Ace Drillers Ltd | Construction | 2024 |
| Ace Drinks Limited | Wholesale & retail | 2025 |
| Ace Filtration Limited | Manufacturing | 1983 |
| Ace Solutions South Ltd | Construction | 2020 |
| Acehub Technologies Ltd | Information & communication | 2025 |
| Aceocta Limited | Information & communication | 2025 |
| ACG Digital Design Ltd | Information & communication | 2020 |
| Acme Dominion Property Management Ltd | Real estate | 2022 |
| Acoms Fabrication Ltd | Extraterritorial | 2012 |
| Acoms Limited | Manufacturing | 2008 |
| Acoms Property Limited | Real estate | 2023 |
| Acorn Shopfitting Ltd | Construction | 2011 |
| ACR Fire & Electrical Ltd | Construction | 2025 |
| Action Engineering Services Ltd | Manufacturing | 2025 |
| ACTIV8 Fitness Camp Limited | Arts & recreation | 2017 |
| Active Kinetic 1 Ltd | Manufacturing | 2023 |
| Active Trader Properties Limited | Real estate | 2020 |
| Acton Surveyors Ltd | Professional & scientific | 2024 |
| AD City Services Ltd | Construction | 2019 |
| AD Delivers Ltd | Transport & logistics | 2024 |
| AD Maximam Ltd | Other services | 2019 |
| Adam James Decor Ltd | Construction | 2019 |
| Adaoha and Associates Limited | Health & social care | 2010 |
| Adebest Global IT Solutions Limited | Administrative & support | 2019 |
| Adeco Construction Ltd | Other services | 2023 |
| Adeco Developments Ltd | Construction | 2024 |
| Adeco Holdings Ltd | Real estate | 2023 |
| Adeco Trading Ltd | Construction | 2023 |
| Adelaide OLU Groups Ltd | Administrative & support | 2020 |
| Adelenas Land Ltd | Real estate | 2025 |
| Adept Data Services Ltd | Information & communication | 2021 |
| Adesina Holdings and Investments Ltd | Administrative & support | 2025 |
| Adex Construction and Plants Limited | Construction | 2014 |
| Adfx Limited | Professional & scientific | 2025 |
| Adifas Services Ltd | Transport & logistics | 2026 |
| Adina Alexandra Hutanu Ltd | Transport & logistics | 2025 |
| Adk-M Limited | Construction | 2023 |
| Admers Electrical Services Limited | Manufacturing | 2013 |
| Admin Crew Ltd | Administrative & support | 2023 |
| Admiral Gardens Residents Company Limited | Households | 1999 |
| Admiral Mews Management Company Limited | Households | 2023 |
| Admiralty Enterprises Limited | Construction | 2006 |
| Admiralty Gate RTM Company Limited | Households | 2021 |
| Admiralty Park Management Co. Limited | Households | 1991 |
| Adof Concept Limited | Professional & scientific | 2013 |
| Adof Homes Limited | Real estate | 2024 |
| Adomi-Qam Limited | Other services | 2026 |
| Adoniqam Ltd | Professional & scientific | 2017 |
| Adpresents Limited | Wholesale & retail | 2016 |
| Adrenaline PV Ltd | Wholesale & retail | 2023 |
| Adrian GLO Builders Limited | Construction | 2020 |
| Adrian Pavel Ltd | Transport & logistics | 2022 |
| Advance Guards UK Limited | Construction | 2018 |
| Advance Properties Investments Ltd | Real estate | 2019 |
| Advanced Beauty Cosmetic Limited | Other services | 2011 |
| Advanced Mechanical Electrical Solutions Ltd | Professional & scientific | 2024 |
| Advanced Rendering Ltd | Construction | 2017 |
| Advanced Technology Limited | Manufacturing | 2002 |
| Advertisers Delight Limited | Professional & scientific | 2021 |
| Advertyse Media Group Ltd | Information & communication | 2020 |
| Adzagw Ltd | Health & social care | 2022 |
| AE Auto Solutions Ltd | Wholesale & retail | 2021 |
| AE Building Limited | Construction | 2025 |
| Aeds Advisors Limited | Professional & scientific | 2016 |
| Aero Coffee Ltd | Hospitality | 2025 |
| Aero Logistics Ltd | Transport & logistics | 2021 |
| Aerofinish Ltd | Construction | 2026 |
| Aesthetics by KK Limited | Other services | 2025 |
| AEZ Catering Ltd | Hospitality | 2024 |
| AF Accountancy Services Limited | Professional & scientific | 2019 |
| AF Science Consulting Ltd | Professional & scientific | 2024 |
| Affordable Roofing (Kent) Ltd | Construction | 2023 |