| &Breathe Family Wellbeing Limited | Other services | 2017 |
| 12 London Road Residents Company Limited | Households | 1982 |
| 127/131 High Street E13 Management Limited | Households | 1987 |
| 142MG Ltd | Professional & scientific | 2021 |
| 1801 Partnerships Ltd | Professional & scientific | 2025 |
| 195 Victoria Road Management Company Limited | Households | 2002 |
| 1ST Class Networks Limited | Other services | 2014 |
| 1ST Security Ltd | Other services | 2019 |
| 248 Westward Road E.4. Management Limited | Households | 1987 |
| 26HL Holdings Limited | Financial services | 2021 |
| 39VIS Ltd | Administrative & support | 2019 |
| A E Smith Bodycraft Limited | Wholesale & retail | 2008 |
| A Plus Caring Services Ltd | Health & social care | 2023 |
| A Squared Developments Limited | Construction | 2019 |
| A Thorne Limited | Transport & logistics | 2011 |
| A.B Paint and Repair Limited | Construction | 2026 |
| AB FAB Books Ltd | Wholesale & retail | 2009 |
| Abbey Inns Ltd | Hospitality | 2014 |
| Abdullahpur Welfare UK CIC | Health & social care | 2021 |
| Absolution Services Ltd | Information & communication | 2018 |
| AC Wright Building Contractors Limited | Construction | 2011 |
| Access Speech and Language Therapy Ltd | Other services | 2017 |
| Ace Fork Lift Training Limited | Extraterritorial | 2004 |
| Ace Industrial Training Ltd | Extraterritorial | 2004 |
| Ace LGV Training Limited | Education | 2003 |
| Acre & Bourne Limited | Construction | 1999 |
| ACT 3 Theatre Company CIC | Arts & recreation | 2024 |
| Action Handling Equipment Limited | Manufacturing | 1970 |
| Actional Models Ltd | Professional & scientific | 2022 |
| Active Plumbing and Heating Services Ltd | Construction | 2016 |
| ADAN7 Property Ltd | Real estate | 2024 |
| Adenuga Properties Ltd | Real estate | 2023 |
| ADH Properties Ltd | Real estate | 2020 |
| Adkel Limited | Real estate | 1993 |
| ADP Services Ltd | Manufacturing | 2016 |
| Adrisell Ltd | Wholesale & retail | 2025 |
| Adshell Ltd | Wholesale & retail | 2024 |
| Afam Trading Limited | Hospitality | 2025 |
| Agamemnon Road Limited | Real estate | 2014 |
| AH General Building Limited | Construction | 2010 |
| Ajax Hvac Ltd | Energy | 2021 |
| Akteeve Limited | Other services | 2011 |
| Alban Estates Ltd | Construction | 2020 |
| Albany East Limited | Information & communication | 2007 |
| Aleksandra 2012 Ltd | Construction | 2015 |
| Alison Young Planning Associates Ltd | Professional & scientific | 2019 |
| ALL Plumbing and Electrical Ltd | Construction | 2016 |
| ALL Services Property Maintenance Limited | Construction | 2005 |
| Allder Properties Ltd | Real estate | 2025 |
| Allen House Business Centre Ltd | Extraterritorial | 2026 |
| Alliance Aquaculture Limited | Agriculture & fishing | 2019 |
| Alliance Insolvency Partners Limited | Professional & scientific | 2020 |
| Alliance Land and Buildings Ltd | Real estate | 2019 |
| Alzoka Limited | Professional & scientific | 2017 |
| Amalga Consultants Limited | Construction | 2010 |
| Amanda Langer Ltd. | Professional & scientific | 2013 |
| Amber ALE Ltd | Hospitality | 2025 |
| Amberlee Construction Limited | Construction | 1978 |
| AMC Mgmt Limited | Administrative & support | 2026 |
| Amhurst Place Residents Limited | Households | 2000 |
| Andrew Caplin Commercial Limited | Real estate | 2003 |
| Andy Coote Limited | Administrative & support | 2007 |
| Angel Way Management Ltd | Households | 2025 |
| Angela Peacock Limited | Professional & scientific | 2023 |
| Anglian Potters Limited | Other services | 2017 |
| Anglo Dutch Foods Limited | Wholesale & retail | 2025 |
| Antimicrobial Focus Ltd | Professional & scientific | 2022 |
| Apex Asset Capital Ltd | Financial services | 2026 |
| App Security London Ltd | Construction | 2018 |
| Appsum | Professional & scientific | 2020 |
| Aqua Corner Limited | Hospitality | 2019 |
| Aqua Lane Limited | Hospitality | 2019 |
| Aqua Pubs Limited | Hospitality | 2019 |
| Aqua Road Limited | Hospitality | 2019 |
| Aqua Taverns Limited | Hospitality | 2019 |
| ARA Neos Ltd | Administrative & support | 2026 |
| ARD NA RI Properties Limited | Real estate | 2019 |
| ARD Projects Limited | Professional & scientific | 2023 |
| Arden Berkeley Limited | Information & communication | 2015 |
| Arisal Asset Group Ltd | Financial services | 2019 |
| Arkay Cost Reduction Limited | Wholesale & retail | 1997 |
| Aroland Design Ltd | Professional & scientific | 2025 |
| Around Town Limited | Other services | 2014 |
| Array Property Limited | Real estate | 2024 |
| Arrow Trading Ltd | Wholesale & retail | 2024 |
| Ascension Youth Mentoring & Support Services CIC | Education | 2024 |
| ASH Production Services Ltd | Information & communication | 2024 |
| Ashcroft Coaching Limited | Education | 2022 |
| Ashley James Limited | Professional & scientific | 1993 |
| Asling Associates Ltd | Administrative & support | 2022 |
| Aspen GAS Limited | Professional & scientific | 2008 |
| Aspen Property (London) Limited | Real estate | 2020 |
| Aspire Flight Training Limited | Education | 2026 |
| Asset Administration Limited | Financial services | 2026 |
| Astondeck Limited | Professional & scientific | 2017 |
| Astra Building Services Limited | Construction | 2023 |
| Atelier Marketing Ltd | Professional & scientific | 2022 |
| Automation East Anglia Ltd | Professional & scientific | 2019 |
| Automotif Ltd | Wholesale & retail | 2026 |
| Autopoint Stansted Limited | Wholesale & retail | 2015 |