| 1 Portsmouth Avenue Management Limited | Households | 2024 |
| 10 Beaufort Road Limited | Households | 1997 |
| 10-67 Limited | Financial services | 2015 |
| 126 Summer Road Limited | Households | 2013 |
| 14 ST James Road RTM Company Limited | Households | 2022 |
| 18 Thorkhill Road Management Limited | Households | 2018 |
| 18 Tremadoc Road Ltd | Households | 2022 |
| 1ST Class Productions Ltd | Information & communication | 2009 |
| 21 Cardigan Road Residents Company Limited | Households | 1999 |
| 22 Films Limited | Information & communication | 2018 |
| 24 Granville Road Ltd | Households | 2023 |
| 3 Bear Ventures Ltd | Professional & scientific | 2024 |
| 34 SAS Limited | Real estate | 2002 |
| 38 Consulting Ltd | Professional & scientific | 2015 |
| 4 Day Week Collective Ltd | Professional & scientific | 2024 |
| 57 Jeffreys Road Residents Association Limited | Households | 1985 |
| 58 Thistledene Limited | Households | 2013 |
| 7/8 Linden Close Property Management Limited | Households | 2018 |
| 9 Yards Construction Ltd | Construction | 2022 |
| 97 Music Group Ltd | Information & communication | 2023 |
| 97 Spaces Ltd | Real estate | 2026 |
| 98 Newlands Park Ltd | Households | 2020 |
| 9BY9 Ltd | Information & communication | 2010 |
| A and J Accountants Limited | Professional & scientific | 2024 |
| A Brave New Sound Limited | Financial services | 2020 |
| A Bunch of Numbers Ltd | Manufacturing | 2023 |
| Abacus Catering Limited | Hospitality | 1985 |
| Abacus Merchandising Ltd | Administrative & support | 2025 |
| Ac&S Design Limited | Administrative & support | 2013 |
| ACD Coachconsult Ltd | Information & communication | 2024 |
| ACM Surrey Ltd | Extraterritorial | 2019 |
| Acma Holdings Limited | Professional & scientific | 2022 |
| Actko Lifestyle Ltd | Wholesale & retail | 2023 |
| Adam Miller Garden Designs Limited | Administrative & support | 2016 |
| Adamant Materials Ltd | Information & communication | 2017 |
| Addoffice Ltd | Wholesale & retail | 2022 |
| ADH Professional Services Ltd | Professional & scientific | 2026 |
| Africa Greenco Founders Ltd | Energy | 2018 |
| Africa Greenco Group Limited | Energy | 2021 |
| AGC Anaesthesia Ltd | Health & social care | 2023 |
| Agrolidya Global Holdings Ltd | Financial services | 2026 |
| AID Interactive International Limited | Real estate | 1981 |
| Airdeal Limited | Administrative & support | 1984 |
| AJ Family Office Concierge Ltd | Administrative & support | 2023 |
| AJM Martindale Property Ltd | Real estate | 2022 |
| AKW Smile Limited | Health & social care | 2026 |
| Alamein Taqa Company Ltd | Manufacturing | 2023 |
| ALE & Payne Limited | Hospitality | 2009 |
| Alex Devitt Marketing Limited | Professional & scientific | 2023 |
| Alexander James & Company Limited | Professional & scientific | 2004 |
| Alexander Lodge Company Ltd | Hospitality | 2019 |
| Alitheo Ventures Ltd | Financial services | 2022 |
| ALL Good Dogs Ltd | Other services | 2024 |
| Alliance Projects Management Limited | Real estate | 2013 |
| ALM Services PVT Ltd | Information & communication | 2013 |
| Alternative Future Ltd | Professional & scientific | 2017 |
| Amari Education Ltd | Professional & scientific | 2026 |
| Ambesi Limited | Professional & scientific | 2021 |
| Ambientchat.Ai Ltd | Information & communication | 2025 |
| Amity Finance Limited | Financial services | 1970 |
| AML Architectural Services Limited | Administrative & support | 2025 |
| Amped UP Group Ltd | Households | 2019 |
| Ampel Limited | Wholesale & retail | 2025 |
| AMR Wealth Management Limited | Financial services | 2024 |
| Amrit Beauty Saloon Ltd | Other services | 2026 |
| AMW Medical Communications Limited | Administrative & support | 2025 |
| Anchor International Freight Limited | | 1976 |
| Andor Management Limited | Wholesale & retail | 2023 |
| Andrew Gill Motion Graphics Limited | Information & communication | 2013 |
| Andy Bird Consultancy Limited | Administrative & support | 2017 |
| Angel Property Holdings Ltd | Real estate | 2019 |
| Angel Twenty Two Limited | Arts & recreation | 2017 |
| Angels Beauty Room Limited | Administrative & support | 2017 |
| Angels Thames Ditton Hair & Beauty Ltd | Other services | 2016 |
| Angis Cleaning Services Ltd | Administrative & support | 2023 |
| Animal Games Inc LLP | | 2021 |
| Annexe Studios Ltd | Other services | 2024 |
| Aoland Limited | Real estate | 2024 |
| AP Physiotherapy Limited | Health & social care | 2022 |
| Apgeotechnics Limited | Construction | 1995 |
| APM Property Limited | Construction | 2015 |
| Apollo Management Associates Limited | Professional & scientific | 2017 |
| Aprilodge Limited | | 1987 |
| APX Life Sciences Limited | Administrative & support | 2025 |
| Archangel Voices Limited | Information & communication | 2008 |
| Architectural Physics Ltd | Professional & scientific | 2024 |
| Arena International Management Limited | Administrative & support | 2006 |
| Areta Press Ltd | Information & communication | 2026 |
| Arian Property Ltd | Real estate | 2014 |
| ARK Agency Group Ltd | Professional & scientific | 2024 |
| Armstrong South Limited | Real estate | 2007 |
| Artaban Film Limited | Information & communication | 2026 |
| Artellite Limited | Wholesale & retail | 2003 |
| Artsmediapeople Ltd | Administrative & support | 2012 |
| Arzico Ltd | Wholesale & retail | 2025 |
| Ashridge Consultants Ltd | Administrative & support | 2022 |
| ASK Property Essentials Limited | Households | 2025 |
| Assisted Living Project 1 Limited | Real estate | 2023 |
| Assisted Living Project 2 Limited | Real estate | 2025 |
| Assisted Living Project Limited | Financial services | 2023 |