| Alahad Consultants Ltd | Hospitality | 2022 |
| ALB Core Limited | Arts & recreation | 2025 |
| Albany Lodge (Thames Ditton) Residents Association Limited | Households | 1990 |
| Albion Contracts (London) Limited | Construction | 2009 |
| Albion Energy Investments Ltd. | Construction | 2018 |
| Albrit Contractors Ltd | Construction | 2010 |
| Alcohol Ninja Ltd | Information & communication | 2019 |
| Alderwick James & Co Limited | Professional & scientific | 2002 |
| Aleks 84 Ltd | Construction | 2024 |
| Alex & Nicholas Limited | Information & communication | 2014 |
| Alexander Advisory Solutions Limited | Professional & scientific | 2019 |
| Alexander Court (Surbiton) Residents Association Limited | Households | 1973 |
| Alexander Court Surbiton Management Company Limited | Households | 2013 |
| Alexander Deli Co Limited | Hospitality | 2021 |
| Alexandra Restaurant Ltd | Hospitality | 2018 |
| Alexen Avocats (UK) Limited | Administrative & support | 2001 |
| Alfajer UK Ltd | Wholesale & retail | 2022 |
| Alfgus Investments Ltd | Real estate | 2025 |
| Algy Ltd | Information & communication | 2022 |
| Aliches Ltd | Real estate | 2024 |
| Align Operations Limited | Transport & logistics | 2025 |
| Alioth Ventures Ltd | Hospitality | 2025 |
| Alira Capital Ltd | Wholesale & retail | 2013 |
| Alive Consulting Ltd | Professional & scientific | 2023 |
| ALL About the Face Ltd | Other services | 2016 |
| ALL Areas Access Ltd | Other services | 2009 |
| ALL Bounce Surrey Limited | Arts & recreation | 2018 |
| ALL by Mama Ltd | Wholesale & retail | 2014 |
| ALL Coin Signals Limited | Professional & scientific | 2025 |
| ALL Things Physio Ltd | Health & social care | 2016 |
| Allans the Accountants Ltd | Professional & scientific | 2007 |
| Allberry Engineering and Design Ltd | Professional & scientific | 2017 |
| Allenfare Ltd | Households | 2008 |
| Alliance Property Developments U.K. Limited | Manufacturing | 1999 |
| Allied Gold Resources Ltd | Mining & quarrying | 2006 |
| Allied OIL & GAS Ltd | Mining & quarrying | 2006 |
| Allora Property Group Ltd | Construction | 2026 |
| Allstars Film & TV Ltd | Professional & scientific | 2022 |
| Ally Construction Ltd | Construction | 2022 |
| Allyroz Ltd | Health & social care | 2023 |
| Almond Alliance Limited | Real estate | 2009 |
| Alopia Ltd | Wholesale & retail | 2026 |
| Alpgul Ltd | Real estate | 2025 |
| Alpha Electrical London Ltd | Other services | 2016 |
| Alpha Restoration Ltd | Administrative & support | 2014 |
| Alphaclear Limited | Construction | 2017 |
| Alphen Consulting Ltd | Administrative & support | 2021 |
| Alpine Electrical Contractors Ltd | Construction | 2018 |
| Alpine Realty Birchdene Ltd | Construction | 2017 |
| Alpine Realty Partners Ltd | Administrative & support | 2013 |
| Alston Training Limited | Administrative & support | 2005 |
| Alwyns Close Limited | Households | 2019 |
| AM General Construction Ltd | Construction | 2023 |
| AMA Creation Ltd | Wholesale & retail | 2018 |
| Amardesh 4 Ltd | Hospitality | 2013 |
| Amberbay Operations Ltd | Financial services | 2011 |
| Ambica Enterprise UK Ltd | Manufacturing | 2026 |
| Ambika Falcon Limited | Hospitality | 2022 |
| Ambika Properties Limited | Real estate | 2025 |
| Ambush Entertainment Ltd | Information & communication | 2011 |
| AMD (London) Holdings Limited | Financial services | 2024 |
| AMD Investment Holdings Limited | Financial services | 2024 |
| AME Mori Holdings Ltd | Real estate | 2024 |
| Amelia Studio Room Ltd | Other services | 2016 |
| Amic Building Ltd | Construction | 2024 |
| Amigoservices Group Ltd | Construction | 2017 |
| Amistad Property Ltd | Real estate | 2023 |
| Amlaaae Limited | Other services | 2025 |
| AMM Social Media Ltd | Professional & scientific | 2026 |
| Amos Consulting Group Ltd | Information & communication | 2024 |
| AMR Tax Ltd | Professional & scientific | 2019 |
| Amre Homes Ltd | Construction | 2024 |
| Amtm Properties Limited | Real estate | 2017 |
| AMU Construction Ltd | Extraterritorial | 2025 |
| Amvs Homes Ltd | Health & social care | 2016 |
| AMY Colaco-Osorio Limited | Professional & scientific | 2021 |
| Anaaya Catering Ltd | Wholesale & retail | 2022 |
| Anagennisi Ltd | Information & communication | 2021 |
| Analytical Improvement Ltd | Other services | 2022 |
| Anamaria Loredana Ltd | Transport & logistics | 2021 |
| Ananas Petit Ltd | Wholesale & retail | 2019 |
| Anderson's Exemplar Ltd | Construction | 2019 |
| Andreev Design Ltd | Construction | 2022 |
| Andrew Duff Garden Design Ltd | Administrative & support | 2019 |
| Andrew Foster Leadership Limited | Professional & scientific | 2026 |
| Andy Algar Regeneration Consultancy Limited | Professional & scientific | 2024 |
| Andy Edits Limited | Information & communication | 2024 |
| Andy Jackson Engineering Ltd | Manufacturing | 2025 |
| Anej Limited | Administrative & support | 2010 |
| Anesam Properties Ltd | Real estate | 2024 |
| Aneta Bower Ltd | Financial services | 2024 |
| Angad Exports UK Food Ltd | Wholesale & retail | 2025 |
| Angel Style Ltd | Hospitality | 2024 |
| Angels of the Hood Limited | Extraterritorial | 2021 |
| Anglesey Avenue Investment Limited | Real estate | 2026 |
| Anglican Databases Limited | Information & communication | 2009 |
| Anglo Suisse Investments Limited | Financial services | 2005 |
| Anglopass Limited | Education | 2025 |
| Anika Sterilis UK Limited | Manufacturing | 2023 |
| Anjalisr Consultancy Limited | Professional & scientific | 2022 |