| Adsim Properties Ltd | Real estate | 2026 |
| Advance Coating Technology Limited | Professional & scientific | 2005 |
| Advanced Direct Mail Holdings Limited | Other services | 2017 |
| Advanced Holdings & Investments Limited | Financial services | 2026 |
| Advanced Polymers Holdings Ltd | Financial services | 2025 |
| Advanced Pre-Fab Solutions Ltd | Manufacturing | 2019 |
| Advanced Seals and Gaskets Holdings Limited | Financial services | 2008 |
| Advanced Seals and Gaskets Limited | Manufacturing | 1996 |
| ADW Electrical Ltd | Construction | 2023 |
| Adzano Collection Limited | Wholesale & retail | 2017 |
| AE Optometry Limited | Health & social care | 2015 |
| AED Ventilation Limited | Construction | 2020 |
| Aegis Accounting Services Ltd | Professional & scientific | 2025 |
| Aeroconnect Solutions Ltd | Wholesale & retail | 2026 |
| AF Dalston Limited | Arts & recreation | 2017 |
| AF Grandstand Racing Limited | Arts & recreation | 2016 |
| AF Islington Limited | Arts & recreation | 2015 |
| AF Walthamstow Limited | Arts & recreation | 2015 |
| Affan Builders Ltd | Construction | 2026 |
| Affinity PROJ3CTS Limited | Administrative & support | 2012 |
| Afghan Bar and Grill Ltd | Hospitality | 2025 |
| AFJ Solutions Ltd | Information & communication | 2008 |
| African Caribbean Community Network (Accn) | Other services | 2010 |
| Afro Entertainment Studios Ltd | Information & communication | 2023 |
| AFS Auto Centre Ltd | Wholesale & retail | 2020 |
| AFT Ventures Ltd | Financial services | 2018 |
| Afzal Estates and Lettings Ltd | Real estate | 2023 |
| AGL Associates (WM) Limited | Professional & scientific | 2016 |
| AGL Associates Holding Co. Limited | Real estate | 2021 |
| AGL Associates Ltd | Extraterritorial | 2018 |
| AGL Corporate Merchandising Ltd. | Wholesale & retail | 2002 |
| AGP Auto Mobile Service Ltd | Wholesale & retail | 2026 |
| Agricultural & Cross Country Vehicles Limited | Wholesale & retail | 2002 |
| Agrivera Ceylon Product Limited | Wholesale & retail | 2026 |
| AGS Transport Services Limited | Transport & logistics | 2018 |
| Agyengo Repairs Limited | Wholesale & retail | 2024 |
| Ahcb Ltd | Wholesale & retail | 2024 |
| Aheercozynest Limited | Wholesale & retail | 2025 |
| Ahmed and Ahmed Associate Ltd | Wholesale & retail | 2023 |
| Ahmed Commercial Investments Ltd | Real estate | 2026 |
| Ahmed Design Ltd | Professional & scientific | 2020 |
| AI Taxis Limited | Transport & logistics | 2024 |
| Aidan Maguire Ltd | Other services | 2011 |
| AIM Environmental Group Ltd | Administrative & support | 2021 |
| AIM FM Group Ltd | Administrative & support | 2026 |
| AIM Investment Group Ltd | Financial services | 2026 |
| AIM Plant & Site Services Limited | Administrative & support | 2015 |
| AIM Utilities Limited | Construction | 2009 |
| Aintree Carpentry and Construction Limited | Construction | 2019 |
| Air Asia Travel Limited | Real estate | 2004 |
| Air Conditioning and Heating 4 U Limited | Manufacturing | 2011 |
| Aira Gems Ltd | Manufacturing | 2025 |
| Airteck Services Limited | Professional & scientific | 2021 |
| Aisolo Limited | Administrative & support | 2025 |
| Aitd Ltd | Construction | 2026 |
| AJ Corporate Limited | Hospitality | 2025 |
| AJ Living Estates Ltd | Real estate | 2025 |
| AJ Retrims Ltd | Wholesale & retail | 2024 |
| AJB Foams Limited | Manufacturing | 2012 |
| AJC Delivery Service Limited | Transport & logistics | 2024 |
| AJC Finishes Ltd | Construction | 2025 |
| AJH Roofing Midlands Ltd | Construction | 2024 |
| Ajit Holdings Ltd | Real estate | 2020 |
| Ajkig Limited | Information & communication | 2026 |
| AJL 2026 Properties Ltd | Real estate | 2026 |
| AJL Holdings and Investments Ltd | Financial services | 2026 |
| Ajouni Ltd | Health & social care | 2021 |
| AJS Consulting & Sales Limited | Administrative & support | 2018 |
| AJS Design & Services Ltd. | Administrative & support | 2019 |
| AJS Excavations Ltd | Construction | 2016 |
| Ajss Properties Ltd | Real estate | 2026 |
| AJZ Autos Ltd | Wholesale & retail | 2022 |
| AK Dharma & Limited | Wholesale & retail | 2026 |
| AK Dudley Builders Limited | Construction | 2024 |
| AK Holdings Midlands Ltd | Financial services | 2026 |
| AK Investment Property Ltd | Real estate | 2026 |
| AK Midland Properties Ltd | Real estate | 2023 |
| AK Motor Vehicle Ltd | Other services | 2025 |
| AK Securitee Limited | Wholesale & retail | 2024 |
| AK Travel Global Ltd | Administrative & support | 2008 |
| AK Travel Ltd | Administrative & support | 2019 |
| Akaal Courier Services Limited | Transport & logistics | 2018 |
| Akala Childrens Services Ltd | Health & social care | 2024 |
| Akamai Global Inc. Ltd | Information & communication | 2016 |
| Akasi’S Delight Ltd | Hospitality | 2026 |
| Akber Khan Ltd | Real estate | 2018 |
| Akhtar Holdings and Investments Ltd | Financial services | 2026 |
| Akire Ltd | Manufacturing | 2023 |
| AKR Mega Mart Ltd | Wholesale & retail | 2024 |
| AKY Properties Ltd | Real estate | 2022 |
| AL Cleaning Services Limited | Administrative & support | 2019 |
| AL KMS Ltd | Wholesale & retail | 2025 |
| AL Noor Prime Investments Limited | Real estate | 2025 |
| AL Noor Supermarket Limited | Wholesale & retail | 2016 |
| AL Sudani Ltd | Wholesale & retail | 2023 |
| Al-Badar Auto Tech Ltd | Wholesale & retail | 2023 |
| Al-Fatah Ltd | Wholesale & retail | 2022 |
| Alaaz Property West Midlands Ltd | Real estate | 2021 |
| Aladdin Products Global Ltd | Other services | 2023 |
| Alam Eyecare Ltd | Wholesale & retail | 2025 |