| 8 Moreton Road RTM Company Limited | Households | 2007 |
| 8 Tirlemont Road Ltd | Households | 2015 |
| 8WB Ltd | Information & communication | 2024 |
| 9 Croham Valley Road Limited | Real estate | 2026 |
| 9 Meadow Road Management Limited | Real estate | 2000 |
| 9 Moreton Road Limited | Households | 2008 |
| 96 Avondale Road RTM Company Ltd | Real estate | 2015 |
| A & a Mechanical Services Limited | Construction | 2017 |
| A & J M Sheppard (Pencoed) Limited | Extraterritorial | 1996 |
| A & M Abbot Medicals Ltd | Health & social care | 2014 |
| A & R Carriages Limited | Wholesale & retail | 2013 |
| A & S Laundrettes Ltd | Other services | 2026 |
| A by Iram Ltd | Wholesale & retail | 2024 |
| A Collective (SW London) CIC | Professional & scientific | 2023 |
| A G Comfy Homes Ltd | Real estate | 2021 |
| A H Cleaning Removals Ltd | Transport & logistics | 2022 |
| A Hall Maintenance Ltd | Construction | 2019 |
| A Kozan Limited | Hospitality | 2025 |
| A P Assets (London) Limited | Professional & scientific | 2013 |
| A P Properties (Brixton) Limited | Real estate | 2016 |
| A P Windows & Doors Limited | Construction | 2012 |
| A Star Renovators Limited | Construction | 2012 |
| A Third Way Ltd | Financial services | 2023 |
| A to Z Removals and Logistics Ltd | Transport & logistics | 2026 |
| A&Ak Property Limited | Real estate | 2022 |
| A&E Dryliner Ltd | Construction | 2012 |
| A&E PR & Event Company Limited | Professional & scientific | 2022 |
| A&F Real Estates Ltd | Real estate | 2020 |
| A&P Master Construction Limited | Construction | 2008 |
| A-Plus Electrics (South East) Limited | Construction | 2025 |
| A-Z Building Solutions Ltd | Construction | 2020 |
| A-Z-Electricallondon. Limited | Energy | 2016 |
| A. J. Gilbert (Chemist) Limited | Health & social care | 1998 |
| A.&J.M. Sheppard Limited | Wholesale & retail | 1975 |
| A.A.I.A.A. Immersive Consultancy CIC | Health & social care | 2023 |
| A.D Pilates Limited | Arts & recreation | 2025 |
| A.M Grand Designs Ltd | Real estate | 2021 |
| A.Ryland & Co Ltd | Financial services | 2024 |
| A.S.H. Imports (UK) Limited | Wholesale & retail | 2009 |
| A2D Homes Limited | Real estate | 2023 |
| A2Z Edutainment Ltd | Education | 2018 |
| A2Z London Private Hire Limited | Transport & logistics | 2025 |
| A2Z Motor Repairs Ltd | Wholesale & retail | 2026 |
| A@Chis Ltd | Other services | 2026 |
| AA Defence Limited | Professional & scientific | 2013 |
| AA Properties Management Ltd | Other services | 2014 |
| AAA Holdings (London) Limited | Real estate | 2026 |
| AAA Properties Services Limited | Other services | 2023 |
| Aaadesignerdeals Ltd | Wholesale & retail | 2026 |
| Aads Engineering Ltd | Manufacturing | 2025 |
| Aajj Properties Ltd | Real estate | 2023 |
| AAR 21 Ltd | Real estate | 2020 |
| AAR Developments Ltd | Construction | 2012 |
| Aarmedics Ltd | Health & social care | 2026 |
| Aasp Properties Limited | Households | 2022 |
| AB Fire&Security Ltd | Construction | 2023 |
| Abacalc Limited | Professional & scientific | 2015 |
| Abasheen Investments Limited | Real estate | 2005 |
| Abayoga Ltd | Arts & recreation | 2020 |
| Abba Electrical Services Limited | Professional & scientific | 2007 |
| Abbanti Ltd | Professional & scientific | 2025 |
| Abbess Teaching & Instruction Ltd. | Professional & scientific | 1997 |
| Abbeyfield Sanderstead Society Limited(The) | Health & social care | 1962 |
| Abdimedics Limited | Health & social care | 2014 |
| Abhi Care Ltd | Health & social care | 2013 |
| Abhiestates Ltd | Real estate | 2020 |
| Abhimed Ltd | Wholesale & retail | 2020 |
| Abianosh Ltd | Wholesale & retail | 2022 |
| Abiogenesis Clinpharm Limited | Professional & scientific | 2025 |
| Abolt Limited | Health & social care | 2014 |
| Abounding Grace Limited | Professional & scientific | 2010 |
| Absence of Colour Limited | Wholesale & retail | 2014 |
| Absolute Cars Private Hire Ltd | Transport & logistics | 2024 |
| Absolute Electrical ISC Ltd | Administrative & support | 2008 |
| Absolute Plumbing & Heating (Surrey) Ltd | Construction | 2011 |
| AC12 Limited | Construction | 2017 |
| Academi Education & Consulting Ltd | Education | 2025 |
| Accellence (UK) Limited | Information & communication | 2017 |
| Access Metal and Gateworks Limited | Construction | 2017 |
| Accessable Consulting Ltd | Professional & scientific | 2024 |
| Accounts Tax Associates Ltd | Professional & scientific | 2024 |
| Accountserve Limited | Professional & scientific | 1994 |
| Ace Electrical Projects Limited | Construction | 2019 |
| Ace Fitters Limited | Construction | 2017 |
| Ace London Maintenance Ltd | Construction | 2021 |
| ACE2B Ltd | Wholesale & retail | 2021 |
| Acoustic Surfaces Limited | Extraterritorial | 2024 |
| ACP Empowerment CIC | Education | 2025 |
| ACS Contracting Ltd | Construction | 2019 |
| Actualising U! Ltd | Health & social care | 2021 |
| Acube Consultants Ltd | Information & communication | 2012 |
| ACW Security Ltd | Administrative & support | 2024 |
| AD Creations Limited | Manufacturing | 2008 |
| AD S GA Ltd | Professional & scientific | 2005 |
| ADA Advisory Ltd | Administrative & support | 2023 |
| Adam Aesthetics Limited | Health & social care | 2021 |
| Adam Aram Golf Limited | Arts & recreation | 2008 |
| Adam John Consulting Ltd | Professional & scientific | 2024 |
| Adams Dorn Limited | Information & communication | 2019 |
| Adana Boston Foreign Language Services Ltd | Education | 2025 |