| Affordable Loans Limited | Administrative & support | 2016 |
| Afiangba Enterprise Limited | Real estate | 2025 |
| African Descent Co Ltd | Wholesale & retail | 2026 |
| AFT Education Ltd | Extraterritorial | 2025 |
| AFW Training Limited | Administrative & support | 2016 |
| AG Trinity Square Limited | Administrative & support | 2011 |
| Agaf Associates Ltd | Construction | 2018 |
| AGD Safety and Enforcement Ltd | Administrative & support | 2025 |
| Aghoo Limited | Real estate | 2015 |
| Agile Technology and Solutions Ltd | Information & communication | 2018 |
| AH Construction & Development Ltd | Real estate | 2020 |
| AH Heating Services Ltd | Construction | 2020 |
| Ahbura Barber Ltd | Other services | 2023 |
| Ahkmediagroup Limited | Other services | 2019 |
| AHS Group Holdings Ltd | Administrative & support | 2023 |
| AI Education Services Ltd | Information & communication | 2025 |
| AI Platforms Ltd | Professional & scientific | 2023 |
| AIP Management Ltd | Professional & scientific | 2019 |
| Air Health and Wellbeing Limited | Public administration | 2024 |
| Air Real Estate Limited | Real estate | 2024 |
| Air WE Go Ltd | Construction | 2023 |
| AIS Site Services Limited | Construction | 2018 |
| AJ Campbell Legal Limited | Professional & scientific | 2020 |
| Aj&Cie Limited | Wholesale & retail | 2021 |
| AJR Glazing Ltd | Construction | 2025 |
| AJV Constructions Group Ltd | Construction | 2023 |
| Ajya Ltd | Construction | 2020 |
| AK Albion Limited | Real estate | 2023 |
| AKA Diagnostic Imaging Solutions Ltd | Administrative & support | 2019 |
| Akaroa Limited | Financial services | 2025 |
| AKP Real Estate Limited | Real estate | 2018 |
| Aksu Fish Limited | Hospitality | 2025 |
| AL JP Ltd | Real estate | 2019 |
| ALA Group Limited | Real estate | 2025 |
| ALA House Ltd | Professional & scientific | 2019 |
| Alacazoo Alacazam Limited | Other services | 2021 |
| Alanya Management Limited | Extraterritorial | 2020 |
| Alara Abayas Limited | Wholesale & retail | 2023 |
| ALB Eco Houses Ltd | Construction | 2017 |
| Albert House Management Company Limited | Households | 1999 |
| Albert Road Investments Ltd | Construction | 2020 |
| Albiyon Ltd | Professional & scientific | 2025 |
| Alderman Supply & Logistics Ltd | Wholesale & retail | 2019 |
| Aldershot Car Spares Limited | Extraterritorial | 2010 |
| Alderton Consulting & Advisory Limited | Professional & scientific | 2026 |
| Alderton Hill Limited | Administrative & support | 2018 |
| Alesar Properties Limited | Real estate | 2025 |
| Alex Fast Move Limited | Transport & logistics | 2025 |
| Alexander Executive Search Ltd | Administrative & support | 2018 |
| Alfi Nova PLC | Financial services | 2021 |
| Algn Health Limited | Health & social care | 2026 |
| Alheavy Limited | Transport & logistics | 2005 |
| ALI Barbers (Barkingside) Limited | Other services | 2014 |
| ALI Barbers (Loughton) Limited | Other services | 2014 |
| ALI Barbers (Romford) Limited | Other services | 2014 |
| ALI Barbers(Uk) Ltd | Other services | 2013 |
| ALI Capital Ltd | Real estate | 2023 |
| ALI Travel & Tours Limited | Administrative & support | 2006 |
| Alicia's Fashion House Limited | Wholesale & retail | 2016 |
| Aliengb Limited | Transport & logistics | 2020 |
| Aligned Posture Ltd | Other services | 2025 |
| Alisons of Cambridge Limited | Extraterritorial | 2023 |
| Alkalytic Ltd | Other services | 2019 |
| ALL Brands Consultants Ltd | Professional & scientific | 2024 |
| ALL Containers Limited | Other services | 2000 |
| ALL Driveways Limited | Construction | 2014 |
| ALL PAK Saints Limited | Construction | 2012 |
| ALL Parts Essex Ltd | Wholesale & retail | 2018 |
| ALL Pro Consulting Ltd | Administrative & support | 2022 |
| ALL Seasons Air Conditioning Services Limited | Energy | 2014 |
| ALL Seasons Climate Control Projects Limited | Construction | 2006 |
| ALL Seasons Group Services Limited | Extraterritorial | 2018 |
| ALL Seasons Scaffolding Limited | Construction | 2018 |
| ALL Stars Finance Limited | Financial services | 2021 |
| ALL Time Roofing Contractors Ltd | Construction | 2025 |
| ALL Type Waste & Recycling Ltd | Water & waste | 2026 |
| ALL WE Care Ltd | Health & social care | 2022 |
| ALL Wild Ways Limited | Health & social care | 2025 |
| ALL Your Beauty Solutions Ltd | Wholesale & retail | 2019 |
| ALL Your Marketing Limited | Transport & logistics | 2025 |
| Allium Property Group Ltd | Real estate | 2026 |
| Alloy Performance Ltd | Manufacturing | 2025 |
| Allport Consultancy Limited | Transport & logistics | 2025 |
| Allpro Ltd | Construction | 2020 |
| Alma Air Mobility Limited | Administrative & support | 2022 |
| Alma Design and Build Limited | Construction | 2025 |
| Almabeauty&Aesthetic Ltd | Other services | 2024 |
| Almachizit Limited | Professional & scientific | 2020 |
| Almar Estates Ltd | Real estate | 2025 |
| Almena Limited | Hospitality | 2026 |
| Along the Grain Limited | Construction | 2014 |
| Alpha Bravo Charlie Consultancy Limited | Professional & scientific | 2012 |
| Alpha Bravo Ltd | Real estate | 2020 |
| Alpha Contract Services Limited | Construction | 2016 |
| Alpha Drive Limited | Administrative & support | 2023 |
| Alphagraphic Systems Limited | Information & communication | 1987 |
| Alpine Heights Limited | Wholesale & retail | 2018 |
| Alpj Limited | Information & communication | 2023 |
| ALR Group Holdings Ltd | Administrative & support | 2009 |
| ALS Furniture Limited | Manufacturing | 2023 |