| AKA Fine Art Ltd | Wholesale & retail | 2022 |
| AKA the Builders Ltd | Construction | 2023 |
| AKD Capital Limited | Real estate | 2023 |
| AKD Property Ventures Limited | Real estate | 2025 |
| AKH Digital Limited | Information & communication | 2025 |
| AKK Group Ltd | Manufacturing | 2020 |
| AKP Creative Ltd | Information & communication | 2024 |
| AKS Leisure Limited | Arts & recreation | 2018 |
| AL Independent Limited | Health & social care | 2025 |
| Al-Faris Consulting Ltd | Professional & scientific | 2025 |
| Al-Utrujjah Ltd | Education | 2022 |
| Alac Holdco Limited | Financial services | 2026 |
| Alan Ansell Ltd | Extraterritorial | 2018 |
| Albert Road Developments Limited | Construction | 2005 |
| Albex Exhibitions Ltd | Administrative & support | 2015 |
| Albon Construction Services Limited | Professional & scientific | 2012 |
| ALD Property Essex Ltd | Real estate | 2021 |
| Aldermans (Management) Hockley Limited | Real estate | 2016 |
| Aleam Environmental Services Ltd | Water & waste | 2019 |
| Alexander Survey Associates Ltd | Professional & scientific | 2022 |
| Alexander's Dancewear & Productions Limited | Wholesale & retail | 2024 |
| Alfa Stations Limited | Wholesale & retail | 2013 |
| Alfresco Inns Limited | Hospitality | 2020 |
| ALG Strategy Consultants Ltd | Professional & scientific | 2022 |
| ALH Property Limited | Real estate | 2018 |
| Alice Begg Dressage Limited | Agriculture & fishing | 2020 |
| Alice Kate Ltd | Arts & recreation | 2026 |
| Aligar Investments Limited | Other services | 1998 |
| Aligned Ensemble Ltd | Professional & scientific | 2025 |
| Alison Staff Ltd. | Health & social care | 2015 |
| Alispacecia Ltd | Professional & scientific | 2025 |
| ALL 4 U Care Ltd | Health & social care | 2018 |
| ALL About Health Limited | Information & communication | 2023 |
| ALL Good Energy Solutions Ltd | Construction | 2025 |
| ALL Hoods Limited | Wholesale & retail | 2012 |
| ALL Mobility Alliance Ltd | Professional & scientific | 2024 |
| ALL Recycle Essex Ltd | Water & waste | 2021 |
| ALL Roads Lead Left Ltd | Information & communication | 2012 |
| ALL Roofs Limited | Other services | 2010 |
| ALL Seasons Air CON Ltd | Energy | 2025 |
| ALL Security Solutions Ltd | Administrative & support | 2013 |
| ALL Smiles Catering Ltd | Hospitality | 2020 |
| ALL Timber Limited | Construction | 2020 |
| Allbright Windows and Doors Ltd | Manufacturing | 2025 |
| Allcoat Property Consultancy Ltd | Real estate | 2014 |
| Allegri Cleaning Co Limited | Administrative & support | 2003 |
| Allegri Contract Cleaning Limited | Administrative & support | 2019 |
| Allegri Specialised Cleaning Limited | Administrative & support | 2019 |
| Allen Clarke Mechanical Services Limited | Construction | 2015 |
| Allen Facilities Management Services Limited | Administrative & support | 2024 |
| Allen Interiors Limited | Construction | 2024 |
| Allenby Motorcycles Ltd | Wholesale & retail | 2003 |
| Allgood Innovations Limited | Professional & scientific | 2026 |
| Allied Care and Nursing Ltd | Health & social care | 2013 |
| Allied Fabrications Ltd | Manufacturing | 2003 |
| Allied Vehicle Rentals Limited | Administrative & support | 1997 |
| Allison Paving Ltd | Construction | 2001 |
| Alltype Building Contractors (UK) Limited | Construction | 2006 |
| Allys Investment Ltd | Real estate | 2022 |
| Alma Motor Company Limited | Wholesale & retail | 2002 |
| Almi Cars Ltd | Administrative & support | 2016 |
| ALP Builders Limited | Construction | 2022 |
| Alpha Fragrance Memories Limited | Other services | 2026 |
| Alpha Motors 01 Ltd | Wholesale & retail | 2025 |
| Alpine Communications Ltd | Construction | 2022 |
| Alpuclimb Limited | Information & communication | 2009 |
| Alsato Consultants Limited | Real estate | 2004 |
| Alta Quest Energy Corporation (UK) Limited | Mining & quarrying | 1987 |
| Alterna Limited | Hospitality | 2014 |
| Alternative Vision Ltd | Information & communication | 2021 |
| Alu-Tec (UK) Ltd | Manufacturing | 2012 |
| Alumia Partnership (UK) Limited | Financial services | 2025 |
| Alumia Smrf Ltd | Financial services | 2021 |
| Alva House Practice Ltd | Other services | 2014 |
| AM Builders (Essex) Limited | Construction | 2024 |
| AM Fitness Coach Limited | Arts & recreation | 2022 |
| AM Fitness Consultants Limited | Other services | 2025 |
| AM Property Management Services Ltd | Real estate | 2023 |
| Amago Ltd | Other services | 2018 |
| Aman IT Limited | Information & communication | 2012 |
| Amanda Heffernan Interiors Ltd | Extraterritorial | 2024 |
| Amanda Reynolds Therapy Ltd | Health & social care | 2022 |
| Amani Commercials Limited | Real estate | 2024 |
| Amazing Success Limited | Education | 2017 |
| Amber Devil Limited | Construction | 2021 |
| Amca Productions Limited | Information & communication | 2019 |
| Amcc Advisory Limited | Professional & scientific | 2025 |
| Amedia Repair and Design Centre Ltd | Professional & scientific | 2019 |
| Amelia Global Limited | Hospitality | 2021 |
| Amesview Developments Limited | Construction | 2003 |
| AMG Blinds Limited | Wholesale & retail | 2016 |
| AMI Residential Ltd | Real estate | 2025 |
| Amigos Salon Limited | Other services | 2020 |
| Ammanford Meats Ltd | Hospitality | 2026 |
| Amor Group Ltd | Transport & logistics | 2017 |
| Amphlex Holdings Ltd | Information & communication | 2023 |
| Amplified AI Ltd | Administrative & support | 2023 |
| Amplo 1 Limited | Construction | 2019 |
| Amrus Signal Solutions Limited | Transport & logistics | 2017 |
| AMS Financial Services Limited | Financial services | 2001 |