| @Llys CIC | Administrative & support | 2025 |
| A & a Foods (London) Limited | Wholesale & retail | 2010 |
| A & B Computers Limited | Extraterritorial | 1990 |
| A & H Developments (London) Limited | Real estate | 2016 |
| A & K Flights Ltd | Administrative & support | 2017 |
| A & K Tree Limited | Wholesale & retail | 2023 |
| A & M Trading Services Ltd | Wholesale & retail | 2021 |
| A & N Global Limited | Wholesale & retail | 2025 |
| A & R Financials Ltd | Financial services | 2016 |
| A & S Autos (Romford) Limited | Other services | 2008 |
| A & Z Builders Limited | Construction | 2024 |
| A a Beddings Limited | Administrative & support | 2025 |
| A a MAX Ltd | Construction | 2019 |
| A Abraham Limited | Transport & logistics | 2013 |
| A and I Solutions Ltd | Education | 2018 |
| A and Z London Limited | Hospitality | 2023 |
| A Andrei a Ltd | Construction | 2025 |
| A B F Enterprise Ltd | Professional & scientific | 2017 |
| A B Veares Limited | Construction | 2012 |
| A C S Installlation Limited | Construction | 2015 |
| A Carcea Ltd | Construction | 2022 |
| A Caughey Electrical Services Ltd | Construction | 2016 |
| A Curtis Ltd | Construction | 2024 |
| A D Dhillon Construction Limited | Construction | 2016 |
| A E Connections Systems Limited | Wholesale & retail | 2014 |
| A F Fergusons Ltd | Professional & scientific | 2023 |
| A Fools Paradise Ltd | Hospitality | 2025 |
| A G & G Interiors Ltd | Construction | 2012 |
| A Goodacre Ltd | Professional & scientific | 2025 |
| A Journey Ltd | Other services | 2024 |
| A K Auto Sales Ltd | Wholesale & retail | 2018 |
| A K Lease Holdings Ltd | Real estate | 2021 |
| A K N Retail Ltd | Wholesale & retail | 2015 |
| A Khan Property Group Ltd | Real estate | 2026 |
| A Knights Stay Limited | Real estate | 2023 |
| A L C Music Limited | Arts & recreation | 2008 |
| A L M Enforcement & Security Ltd | Administrative & support | 2021 |
| A Lincoln Carpentry Limited | Construction | 2007 |
| A M Automation Services Ltd | Professional & scientific | 2019 |
| A Memorable Ennui Limited | Information & communication | 2026 |
| A P Marley Ltd | Manufacturing | 2018 |
| A P Williamson Consultants Ltd | Professional & scientific | 2011 |
| A Priceless Vision Ltd | Extraterritorial | 2012 |
| A Property 4 YOU Ltd | Real estate | 2018 |
| A Pugh Flats Ltd | Real estate | 2026 |
| A Pugh Properties Ltd | Real estate | 2024 |
| A R Properties & Lets Ltd | Real estate | 2023 |
| A S BAL Trading Ltd | Real estate | 2023 |
| A S Building Management Ltd | Construction | 2015 |
| A S Mullett Limited | Wholesale & retail | 2020 |
| A Sadiku Limited | Construction | 2003 |
| A Serbezov Ltd | Other services | 2016 |
| A Star Crewing Ltd | Administrative & support | 2019 |
| A Star Drycleaning Limited | Other services | 2010 |
| A Star Roofing Services Ltd | Construction | 2025 |
| A Taste of Afrikka Gourmet Ltd | Manufacturing | 2025 |
| A to Z Estates Limited | Real estate | 2022 |
| A to Z Havering Ltd | Transport & logistics | 2015 |
| A V Stone UK Limited | Wholesale & retail | 2013 |
| A V Windscreens Limited | Wholesale & retail | 2020 |
| A Y W Ltd | Wholesale & retail | 2020 |
| A&A Electric Engineering Ltd | Construction | 2019 |
| A&A Executive Travel Limited | Administrative & support | 2024 |
| A&A Intelligent Solutions Limited | Construction | 2015 |
| A&B Building Limited | Construction | 2020 |
| A&B Electrical Installation Ltd | Construction | 2023 |
| A&C Assets Limited | Households | 2016 |
| A&C Empowered Care Services Ltd | Health & social care | 2022 |
| A&C Global Ltd | Construction | 2025 |
| A&C Prop Limited | Real estate | 2022 |
| A&C Properties Inc Limited | Real estate | 2017 |
| A&C Sprinkler Ltd | Public administration | 2024 |
| A&D Steelfixing Limited | Construction | 2024 |
| A&F Stays Limited | Real estate | 2025 |
| A&H Construction Limited | Construction | 2017 |
| A&H Creative Business Solutions Limited | Information & communication | 2014 |
| A&H Real Estate Limited | Real estate | 2020 |
| A&J Construction and Supplying Ltd | Construction | 2025 |
| A&K Imports Ltd | Wholesale & retail | 2023 |
| A&K Property Associates Ltd | Real estate | 2020 |
| A&L Griffiths Property Ltd | Real estate | 2020 |
| A&L Systems Ltd | Manufacturing | 2025 |
| A&M Mechanical Services Ltd | Construction | 2020 |
| A&N Builders Ltd | Construction | 2021 |
| A&N Incorporated Limited | Financial services | 2024 |
| A&O Partners Ltd | Construction | 2010 |
| A&P London Construction Ltd | Construction | 2025 |
| A&R Construct Ltd | Construction | 2024 |
| A&R Consultancy(Uk) Ltd. | Professional & scientific | 2021 |
| A&S Finance Ltd | Financial services | 2023 |
| A&S Legacy Investment Ltd | Real estate | 2026 |
| A&S Naidu Limited | Real estate | 2025 |
| A&T Dreamhouse Ltd | Real estate | 2025 |
| A'S and 9'S Tutoring Ltd | Education | 2024 |
| A-Way UP Ltd | Professional & scientific | 2023 |
| A-Z Prime Painters Ltd | Construction | 2024 |
| A. M. Install Limited | Construction | 2015 |
| A. S. Direct Marketing and Sales Ltd | Real estate | 2005 |
| A.& D.Alexandrou Limited | Real estate | 1964 |
| A.B HCW Ltd | Other services | 2025 |