| Adere Commercial Ltd | Professional & scientific | 2025 |
| ADK Ventures Limited | Real estate | 2023 |
| Adkp Ventures Limited | Real estate | 2025 |
| ADL Property Investing Ltd | Real estate | 2024 |
| Admk Enterprises Ltd | Real estate | 2026 |
| Adorro Limited | Wholesale & retail | 2022 |
| Adrianodeco Ltd | Construction | 2022 |
| Adrimat&Co Limited | Manufacturing | 2021 |
| Adroit AI Labs Ltd | Information & communication | 2025 |
| Adrotex Group Ltd | Wholesale & retail | 2017 |
| Advance Leisure Amusements Limited | Arts & recreation | 2010 |
| Advanced Window Cleaning Ltd | Administrative & support | 2022 |
| Adventures in Compassionate Commerce | Financial services | 2017 |
| AEM Venue Ltd | Hospitality | 2025 |
| AEP Consultancy Ltd | Information & communication | 2023 |
| Aequilibrium Limited | Extraterritorial | 2012 |
| Aerowash Limited | Other services | 2008 |
| Aesthetic & Cosmetic UK Ltd | Health & social care | 2012 |
| Aesthetics Perfection Limited | Other services | 2018 |
| Aetheris Ventures Limited | Other services | 2025 |
| AEW Property Ltd | Real estate | 2025 |
| AF Mouldings Ltd | Construction | 2022 |
| Affinity Electrical Ltd | Construction | 2005 |
| Affirmation Entertainment Ltd | Information & communication | 2023 |
| Affordable Health & Safety Solutions Ltd | Administrative & support | 2023 |
| AG Bulider Ltd | Manufacturing | 2025 |
| Agap Healthcare Ltd | Public administration | 2019 |
| Agarwal Family Holdings Ltd | Real estate | 2024 |
| Agasthi Siddha Private Limited | Manufacturing | 2024 |
| AGB Construction Ltd | Construction | 2021 |
| AGE Concern Havering Trading Ltd. | Wholesale & retail | 1996 |
| Agenisy.Com Limited | Information & communication | 2025 |
| Aggelos Consulting LLP | | 2014 |
| Agility Investments Ltd | Real estate | 2023 |
| Agmh Holding Limited | Financial services | 2025 |
| Agora Retail Consultancy Limited | Real estate | 2026 |
| AGS Corporate Contracts Limited | Professional & scientific | 2023 |
| AGS Facilities Group Ltd | Administrative & support | 2023 |
| AGS Group London Limited | Financial services | 2026 |
| AH Talk Limited | Wholesale & retail | 2023 |
| AHA Property Ltd | Real estate | 2024 |
| Ahfimedis Estate Solutions Limited | Real estate | 2023 |
| Ahmed & Sons (London) Limited | Wholesale & retail | 2016 |
| Ahtisham Construction Ltd | Construction | 2026 |
| AI Ecosystems Ltd | Information & communication | 2025 |
| AI Incorporation Limited | Real estate | 2021 |
| Aide Investments Ltd | Real estate | 2022 |
| Aikaterini Manolidou Ltd | Professional & scientific | 2014 |
| AIM Trade Limited | Other services | 2010 |
| Ainger Zocco AI Systems Ltd | Information & communication | 2025 |
| Air CON Install Ltd | Construction | 2023 |
| Airconomy Ltd | Energy | 2024 |
| Airloop Ltd | Construction | 2019 |
| Airsoftfaceprouk Ltd | Manufacturing | 2021 |
| Aitken and Pearson Limited | Real estate | 2008 |
| Aiwa Environmental Solutions Ltd | Professional & scientific | 2016 |
| AJ Catering London Ltd | Hospitality | 2022 |
| AJ Law Limited | Professional & scientific | 2018 |
| Aj&B Property Limited | Real estate | 2020 |
| Aj&M Service Ltd | Other services | 2017 |
| AJA Interiors Ltd | Construction | 2010 |
| AJC PM Ltd | Professional & scientific | 2022 |
| AJD Construction Limited | Construction | 2016 |
| Ajgold BTL Ltd | Real estate | 2022 |
| Ajgold Properties Ltd | Real estate | 2019 |
| AJL Events Ltd | Wholesale & retail | 2024 |
| AJM Pearman Investments Ltd | Real estate | 2024 |
| AJN Express Ltd | Transport & logistics | 2026 |
| AJS Real Estate Ltd | Real estate | 2016 |
| AK Commercial Operations Limited | Professional & scientific | 2024 |
| Akaaj Limited | Health & social care | 2024 |
| Akaal Fitness Limited | Arts & recreation | 2022 |
| Akaal Heritage Studio Ltd | Arts & recreation | 2018 |
| Akaal Holdings Limited | Real estate | 2018 |
| Akad Services Limited | Professional & scientific | 2016 |
| Akayim Ltd | Hospitality | 2023 |
| Akcks Limited | Real estate | 2026 |
| AKK (Hornchurch) Ltd | Real estate | 2020 |
| AKK Commercial 2 Limited | Real estate | 2025 |
| AKK Commercial 3 Limited | Real estate | 2025 |
| AKK Commercial 4 Limited | Real estate | 2025 |
| AKK Commercial Limited | Real estate | 2025 |
| AKK Residential 2 Limited | Real estate | 2024 |
| AKK Residential Limited | Real estate | 2024 |
| AKN Tech Systems Ltd | Construction | 2026 |
| Akndesign Limited | Manufacturing | 2019 |
| AKO Contracts Ltd | Manufacturing | 2018 |
| Akob (Hornchurch) Limited | Real estate | 2026 |
| Akob Commercial Ltd | Construction | 2019 |
| Akob Franchise Ltd | Construction | 2019 |
| Akob Group Ltd | Financial services | 2019 |
| Akob SF Limited | Construction | 2023 |
| AKS Legal Services Limited | Professional & scientific | 2026 |
| Akun Holdings Ltd | Real estate | 2024 |
| Akun Ltd | Professional & scientific | 2017 |
| AKW Inns Limited | Hospitality | 2024 |
| AKW Leisure Limited | Real estate | 2025 |
| AKW Property Solutions Limited | Hospitality | 2024 |
| AL Azizia Trade Ltd | Wholesale & retail | 2022 |
| AL Maghrib UK Ltd | Education | 2008 |